FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc.c
Date: 2026-08-26 01:27:24
Exec Total Coverage
Lines: 1005 1156 86.9%
Functions: 43 43 100.0%
Branches: 635 823 77.2%
Line Branch Exec Source
1 /*
2 * The simplest AC-3 encoder
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
5 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * The simplest AC-3 encoder.
27 */
28
29 #include <stdint.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/crc.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/mem_internal.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/thread.h"
40 #include "avcodec.h"
41 #include "codec_internal.h"
42 #include "config_components.h"
43 #include "encode.h"
44 #include "me_cmp.h"
45 #include "put_bits.h"
46 #include "audiodsp.h"
47 #include "ac3dsp.h"
48 #include "ac3.h"
49 #include "ac3defs.h"
50 #include "ac3tab.h"
51 #include "ac3enc.h"
52 #include "eac3enc.h"
53
54 #define SAMPLETYPE_SIZE(ctx) (sizeof(float) == sizeof(int32_t) ? sizeof(float) : \
55 (ctx)->fixed_point ? sizeof(int32_t) : sizeof(float))
56
57 typedef struct AC3Mant {
58 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
59 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
60 } AC3Mant;
61
62 #define CMIXLEV_NUM_OPTIONS 3
63 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
64 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
65 };
66
67 #define SURMIXLEV_NUM_OPTIONS 3
68 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
69 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
70 };
71
72 #define EXTMIXLEV_NUM_OPTIONS 8
73 #define extmixlev_options ff_ac3_gain_levels
74
75 /* The first two options apply only to the AC-3 encoders;
76 * the rest is also valid for EAC-3. When modifying it,
77 * it might be necessary to adapt said offset in eac3enc.c. */
78 #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
79 #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
80 const AVOption ff_ac3_enc_options[] = {
81 /* AC-3 downmix levels */
82 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
83 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
84 /* audio production information */
85 {"mixing_level", "Mixing Level", OFFSET(mixing_level), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 111, AC3ENC_PARAM},
86 {"room_type", "Room Type", OFFSET(room_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_SMALL_ROOM, AC3ENC_PARAM, .unit = "room_type"},
87 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
88 {"large", "Large Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_LARGE_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
89 {"small", "Small Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_SMALL_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
90 /* Metadata Options */
91 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AC3ENC_PARAM},
92 {"copyright", "Copyright Bit", OFFSET(copyright), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
93 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), AV_OPT_TYPE_INT, {.i64 = -31 }, -31, -1, AC3ENC_PARAM},
94 {"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dsur_mode"},
95 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
96 {"on", "Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
97 {"off", "Not Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
98 {"original", "Original Bit Stream", OFFSET(original), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
99 /* extended bitstream information */
100 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DOWNMIX_DPLII, AC3ENC_PARAM, .unit = "dmix_mode"},
101 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
102 {"ltrt", "Lt/Rt Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LTRT }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
103 {"loro", "Lo/Ro Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LORO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
104 {"dplii", "Dolby Pro Logic II Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_DPLII }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
105 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
106 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
107 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
108 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
109 {"dsurex_mode", "Dolby Surround EX Mode", OFFSET(dolby_surround_ex_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DSUREX_DPLIIZ, AC3ENC_PARAM, .unit = "dsurex_mode"},
110 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
111 {"on", "Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
112 {"off", "Not Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
113 {"dpliiz", "Dolby Pro Logic IIz-encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DSUREX_DPLIIZ }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
114 {"dheadphone_mode", "Dolby Headphone Mode", OFFSET(dolby_headphone_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dheadphone_mode"},
115 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
116 {"on", "Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
117 {"off", "Not Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
118 {"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_ADCONV_HDCD, AC3ENC_PARAM, .unit = "ad_conv_type"},
119 {"standard", "Standard (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_STANDARD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
120 {"hdcd", "HDCD", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
121 /* Other Encoding Options */
122 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, AC3ENC_PARAM},
123 {"channel_coupling", "Channel Coupling", OFFSET(channel_coupling), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, AC3ENC_OPT_ON, AC3ENC_PARAM, .unit = "channel_coupling"},
124 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "channel_coupling"},
125 {"cpl_start_band", "Coupling Start Band", OFFSET(cpl_start), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, 15, AC3ENC_PARAM, .unit = "cpl_start_band"},
126 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "cpl_start_band"},
127 {NULL}
128 };
129
130 const AVClass ff_ac3enc_class = {
131 .class_name = "AC-3 Encoder",
132 .item_name = av_default_item_name,
133 .option = ff_ac3_enc_options,
134 .version = LIBAVUTIL_VERSION_INT,
135 };
136
137 const FFCodecDefault ff_ac3_enc_defaults[] = {
138 { "b", "0" },
139 { NULL }
140 };
141
142 /**
143 * LUT for number of exponent groups.
144 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
145 */
146 static uint8_t exponent_group_tab[2][3][256];
147
148
149 /**
150 * List of supported channel layouts.
151 */
152 const AVChannelLayout ff_ac3_ch_layouts[19] = {
153 AV_CHANNEL_LAYOUT_MONO,
154 AV_CHANNEL_LAYOUT_STEREO,
155 AV_CHANNEL_LAYOUT_2_1,
156 AV_CHANNEL_LAYOUT_SURROUND,
157 AV_CHANNEL_LAYOUT_2_2,
158 AV_CHANNEL_LAYOUT_QUAD,
159 AV_CHANNEL_LAYOUT_4POINT0,
160 AV_CHANNEL_LAYOUT_5POINT0,
161 AV_CHANNEL_LAYOUT_5POINT0_BACK,
162 {
163 .nb_channels = 2,
164 .order = AV_CHANNEL_ORDER_NATIVE,
165 .u.mask = AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY,
166 },
167 {
168 .nb_channels = 3,
169 .order = AV_CHANNEL_ORDER_NATIVE,
170 .u.mask = AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY,
171 },
172 {
173 .nb_channels = 4,
174 .order = AV_CHANNEL_ORDER_NATIVE,
175 .u.mask = AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY,
176 },
177 {
178 .nb_channels = 4,
179 .order = AV_CHANNEL_ORDER_NATIVE,
180 .u.mask = AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY,
181 },
182 {
183 .nb_channels = 5,
184 .order = AV_CHANNEL_ORDER_NATIVE,
185 .u.mask = AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY,
186 },
187 AV_CHANNEL_LAYOUT_5POINT1,
188 AV_CHANNEL_LAYOUT_5POINT1_BACK,
189 { 0 },
190 };
191
192 /**
193 * Table to remap channels from SMPTE order to AC-3 order.
194 * [channel_mode][lfe][ch]
195 */
196 static const uint8_t ac3_enc_channel_map[8][2][6] = {
197 COMMON_CHANNEL_MAP
198 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
199 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
200 };
201
202 /**
203 * LUT to select the bandwidth code based on the bit rate, sample rate, and
204 * number of full-bandwidth channels.
205 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
206 */
207 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
208 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
209
210 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
211 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
212 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
213
214 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
215 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
216 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
217
218 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
219 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
220 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
221
222 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
223 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
224 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
225
226 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
227 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
228 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
229 };
230
231
232 /**
233 * LUT to select the coupling start band based on the bit rate, sample rate, and
234 * number of full-bandwidth channels. -1 = coupling off
235 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
236 *
237 * TODO: more testing for optimal parameters.
238 * multi-channel tests at 44.1kHz and 32kHz.
239 */
240 static const int8_t ac3_coupling_start_tab[6][3][19] = {
241 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
242
243 // 2/0
244 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
245 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
246 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
247
248 // 3/0
249 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
250 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
251 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
252
253 // 2/1 - untested
254 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
255 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
256 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
257
258 // 3/1
259 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
260 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
261 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
262
263 // 2/2 - untested
264 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
265 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
266 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
267
268 // 3/2
269 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
270 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
271 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
272 };
273
274
275 #define FLT_OPTION_THRESHOLD 0.01
276
277 4 static int validate_float_option(float v, const float *v_list, int v_list_size)
278 {
279 int i;
280
281
1/2
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
 8 for (i = 0; i < v_list_size; i++) {
282
1/2
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
 8 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
283
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 4 times.
 8 v > (v_list[i] - FLT_OPTION_THRESHOLD))
284 4 break;
285 }
286
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 4 if (i == v_list_size)
287 ✗ return AVERROR(EINVAL);
288
289 4 return i;
290 }
291
292
293 4 static void validate_mix_level(void *log_ctx, const char *opt_name,
294 float *opt_param, const float *list,
295 int list_size, int default_value, int min_value,
296 int *ctx_param)
297 {
298 4 int mixlev = validate_float_option(*opt_param, list, list_size);
299
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 4 if (mixlev < min_value) {
300 ✗ mixlev = default_value;
301 ✗ if (*opt_param >= 0.0) {
302 ✗ av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
303 ✗ "default value: %0.3f\n", opt_name, list[mixlev]);
304 }
305 }
306 4 *opt_param = list[mixlev];
307 4 *ctx_param = mixlev;
308 4 }
309
310
311 /**
312 * Validate metadata options as set by AVOption system.
313 * These values can optionally be changed per-frame.
314 *
315 * @param s AC-3 encoder private context
316 */
317 13 static int ac3_validate_metadata(AC3EncodeContext *s)
318 {
319 13 AVCodecContext *avctx = s->avctx;
320 13 AC3EncOptions *opt = &s->options;
321
322 13 opt->audio_production_info = 0;
323 13 opt->extended_bsi_1 = 0;
324 13 opt->extended_bsi_2 = 0;
325 13 opt->eac3_mixing_metadata = 0;
326 13 opt->eac3_info_metadata = 0;
327
328 /* determine mixing metadata / xbsi1 use */
329
3/4
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 13 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
330 ✗ opt->extended_bsi_1 = 1;
331 ✗ opt->eac3_mixing_metadata = 1;
332 }
333
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
 13 if (s->has_center &&
334
2/4
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 2 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
335 ✗ opt->extended_bsi_1 = 1;
336 ✗ opt->eac3_mixing_metadata = 1;
337 }
338
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
 13 if (s->has_surround &&
339
2/4
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 2 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
340 ✗ opt->extended_bsi_1 = 1;
341 ✗ opt->eac3_mixing_metadata = 1;
342 }
343
344
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
 13 if (s->eac3) {
345 /* determine info metadata use */
346
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
347 ✗ opt->eac3_info_metadata = 1;
348
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
349 ✗ opt->eac3_info_metadata = 1;
350
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->channel_mode == AC3_CHMODE_STEREO &&
351
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
352 ✗ opt->eac3_info_metadata = 1;
353
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 1 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
354 ✗ opt->eac3_info_metadata = 1;
355
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 1 times.
✗ Branch 3 not taken.
 1 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
356
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 opt->ad_converter_type != AC3ENC_OPT_NONE) {
357 ✗ opt->audio_production_info = 1;
358 ✗ opt->eac3_info_metadata = 1;
359 }
360 } else {
361 /* determine audio production info use */
362
2/4
✓ Branch 0 taken 12 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 12 times.
 12 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
363 ✗ opt->audio_production_info = 1;
364
365 /* determine xbsi2 use */
366
3/4
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 10 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 12 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
367 ✗ opt->extended_bsi_2 = 1;
368
3/4
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 8 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 4 times.
 12 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
369 ✗ opt->extended_bsi_2 = 1;
370
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12 times.
 12 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
371 ✗ opt->extended_bsi_2 = 1;
372 }
373
374 /* validate AC-3 mixing levels */
375
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 1 times.
 13 if (!s->eac3) {
376
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 10 times.
 12 if (s->has_center) {
377 2 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
378 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
379 &s->center_mix_level);
380 }
381
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 10 times.
 12 if (s->has_surround) {
382 2 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
383 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
384 &s->surround_mix_level);
385 }
386 }
387
388 /* validate extended bsi 1 / mixing metadata */
389
2/4
✓ Branch 0 taken 13 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 13 times.
 13 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
390 /* default preferred stereo downmix */
391 ✗ if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
392 ✗ opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
393 ✗ if (!s->eac3 || s->has_center) {
394 /* validate Lt/Rt center mix level */
395 ✗ validate_mix_level(avctx, "ltrt_center_mix_level",
396 &opt->ltrt_center_mix_level, extmixlev_options,
397 EXTMIXLEV_NUM_OPTIONS, 5, 0,
398 &s->ltrt_center_mix_level);
399 /* validate Lo/Ro center mix level */
400 ✗ validate_mix_level(avctx, "loro_center_mix_level",
401 &opt->loro_center_mix_level, extmixlev_options,
402 EXTMIXLEV_NUM_OPTIONS, 5, 0,
403 &s->loro_center_mix_level);
404 }
405 ✗ if (!s->eac3 || s->has_surround) {
406 /* validate Lt/Rt surround mix level */
407 ✗ validate_mix_level(avctx, "ltrt_surround_mix_level",
408 &opt->ltrt_surround_mix_level, extmixlev_options,
409 EXTMIXLEV_NUM_OPTIONS, 6, 3,
410 &s->ltrt_surround_mix_level);
411 /* validate Lo/Ro surround mix level */
412 ✗ validate_mix_level(avctx, "loro_surround_mix_level",
413 &opt->loro_surround_mix_level, extmixlev_options,
414 EXTMIXLEV_NUM_OPTIONS, 6, 3,
415 &s->loro_surround_mix_level);
416 }
417 }
418
419 /* validate audio service type / channels combination */
420
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
421 ✗ avctx->ch_layout.nb_channels == 1) ||
422
1/2
✓ Branch 0 taken 13 times.
✗ Branch 1 not taken.
 13 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
423
1/2
✓ Branch 0 taken 13 times.
✗ Branch 1 not taken.
 13 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
424
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
425 ✗ && avctx->ch_layout.nb_channels > 1)) {
426 ✗ av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
427 "specified number of channels\n");
428 ✗ return AVERROR(EINVAL);
429 }
430
431 /* validate extended bsi 2 / info metadata */
432
2/4
✓ Branch 0 taken 13 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 13 times.
 13 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
433 /* default dolby headphone mode */
434 ✗ if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
435 ✗ opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
436 /* default dolby surround ex mode */
437 ✗ if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
438 ✗ opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
439 /* default A/D converter type */
440 ✗ if (opt->ad_converter_type == AC3ENC_OPT_NONE)
441 ✗ opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
442 }
443
444 /* copyright & original defaults */
445
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 13 if (!s->eac3 || opt->eac3_info_metadata) {
446 /* default copyright */
447
1/2
✓ Branch 0 taken 12 times.
✗ Branch 1 not taken.
 12 if (opt->copyright == AC3ENC_OPT_NONE)
448 12 opt->copyright = AC3ENC_OPT_OFF;
449 /* default original */
450
1/2
✓ Branch 0 taken 12 times.
✗ Branch 1 not taken.
 12 if (opt->original == AC3ENC_OPT_NONE)
451 12 opt->original = AC3ENC_OPT_ON;
452 }
453
454 /* dolby surround mode default */
455
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 13 if (!s->eac3 || opt->eac3_info_metadata) {
456
1/2
✓ Branch 0 taken 12 times.
✗ Branch 1 not taken.
 12 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
457 12 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
458 }
459
460 /* validate audio production info */
461
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (opt->audio_production_info) {
462 ✗ if (opt->mixing_level == AC3ENC_OPT_NONE) {
463 ✗ av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
464 "room_type is set\n");
465 ✗ return AVERROR(EINVAL);
466 }
467 ✗ if (opt->mixing_level < 80) {
468 ✗ av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
469 "80dB and 111dB\n");
470 ✗ return AVERROR(EINVAL);
471 }
472 /* default room type */
473 ✗ if (opt->room_type == AC3ENC_OPT_NONE)
474 ✗ opt->room_type = AC3ENC_OPT_NOT_INDICATED;
475 }
476
477 /* set bitstream id for alternate bitstream syntax */
478
4/6
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 1 times.
✓ Branch 2 taken 12 times.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✓ Branch 5 taken 12 times.
 13 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2))
479 ✗ s->bitstream_id = 6;
480
481 13 return 0;
482 }
483
484 /**
485 * Adjust the frame size to make the average bit rate match the target bit rate.
486 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
487 *
488 * @param s AC-3 encoder private context
489 */
490 1340 static void ac3_adjust_frame_size(AC3EncodeContext *s)
491 {
492
3/4
✓ Branch 0 taken 38 times.
✓ Branch 1 taken 1340 times.
✓ Branch 2 taken 38 times.
✗ Branch 3 not taken.
 1378 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
493 38 s->bits_written -= s->bit_rate;
494 38 s->samples_written -= s->sample_rate;
495 }
496 2680 s->frame_size = s->frame_size_min +
497
2/2
✓ Branch 0 taken 1026 times.
✓ Branch 1 taken 314 times.
 1340 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
498 1340 s->bits_written += s->frame_size * 8;
499 1340 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
500 1340 }
501
502 /**
503 * Set the initial coupling strategy parameters prior to coupling analysis.
504 *
505 * @param s AC-3 encoder private context
506 */
507 1340 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
508 {
509 int blk, ch;
510 int got_cpl_snr;
511 int num_cpl_blocks;
512
513 /* set coupling use flags for each block/channel */
514 /* TODO: turn coupling on/off and adjust start band based on bit usage */
515
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
516 8040 AC3Block *block = &s->blocks[blk];
517
2/2
✓ Branch 0 taken 13998 times.
✓ Branch 1 taken 8040 times.
 22038 for (ch = 1; ch <= s->fbw_channels; ch++)
518 13998 block->channel_in_cpl[ch] = s->cpl_on;
519 }
520
521 /* enable coupling for each block if at least 2 channels have coupling
522 enabled for that block */
523 1340 got_cpl_snr = 0;
524 1340 num_cpl_blocks = 0;
525
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
526 8040 AC3Block *block = &s->blocks[blk];
527 8040 block->num_cpl_channels = 0;
528
2/2
✓ Branch 0 taken 13998 times.
✓ Branch 1 taken 8040 times.
 22038 for (ch = 1; ch <= s->fbw_channels; ch++)
529 13998 block->num_cpl_channels += block->channel_in_cpl[ch];
530 8040 block->cpl_in_use = block->num_cpl_channels > 1;
531 8040 num_cpl_blocks += block->cpl_in_use;
532
2/2
✓ Branch 0 taken 3444 times.
✓ Branch 1 taken 4596 times.
 8040 if (!block->cpl_in_use) {
533 3444 block->num_cpl_channels = 0;
534
2/2
✓ Branch 0 taken 4482 times.
✓ Branch 1 taken 3444 times.
 7926 for (ch = 1; ch <= s->fbw_channels; ch++)
535 4482 block->channel_in_cpl[ch] = 0;
536 }
537
538 8040 block->new_cpl_strategy = !blk;
539
2/2
✓ Branch 0 taken 6700 times.
✓ Branch 1 taken 1340 times.
 8040 if (blk) {
540
2/2
✓ Branch 0 taken 11665 times.
✓ Branch 1 taken 6700 times.
 18365 for (ch = 1; ch <= s->fbw_channels; ch++) {
541
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11665 times.
 11665 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
542 ✗ block->new_cpl_strategy = 1;
543 ✗ break;
544 }
545 }
546 }
547 8040 block->new_cpl_leak = block->new_cpl_strategy;
548
549
5/6
✓ Branch 0 taken 6700 times.
✓ Branch 1 taken 1340 times.
✓ Branch 2 taken 3830 times.
✓ Branch 3 taken 2870 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 3830 times.
 8040 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
550 1340 block->new_snr_offsets = 1;
551
2/2
✓ Branch 0 taken 766 times.
✓ Branch 1 taken 574 times.
 1340 if (block->cpl_in_use)
552 766 got_cpl_snr = 1;
553 } else {
554 6700 block->new_snr_offsets = 0;
555 }
556 }
557
2/2
✓ Branch 0 taken 574 times.
✓ Branch 1 taken 766 times.
 1340 if (!num_cpl_blocks)
558 574 s->cpl_on = 0;
559
560 /* set bandwidth for each channel */
561
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
562 8040 AC3Block *block = &s->blocks[blk];
563
2/2
✓ Branch 0 taken 13998 times.
✓ Branch 1 taken 8040 times.
 22038 for (ch = 1; ch <= s->fbw_channels; ch++) {
564
2/2
✓ Branch 0 taken 9516 times.
✓ Branch 1 taken 4482 times.
 13998 if (block->channel_in_cpl[ch])
565 9516 block->end_freq[ch] = s->start_freq[CPL_CH];
566 else
567 4482 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
568 }
569 }
570 1340 }
571
572
573 /**
574 * Apply stereo rematrixing to coefficients based on rematrixing flags.
575 *
576 * @param s AC-3 encoder private context
577 */
578 1340 static void ac3_apply_rematrixing(AC3EncodeContext *s)
579 {
580 int nb_coefs;
581 int blk, bnd, i;
582 int start, end;
583 1340 uint8_t *flags = NULL;
584
585
2/2
✓ Branch 0 taken 592 times.
✓ Branch 1 taken 748 times.
 1340 if (!s->rematrixing_enabled)
586 592 return;
587
588
2/2
✓ Branch 0 taken 4488 times.
✓ Branch 1 taken 748 times.
 5236 for (blk = 0; blk < s->num_blocks; blk++) {
589 4488 AC3Block *block = &s->blocks[blk];
590
2/2
✓ Branch 0 taken 2226 times.
✓ Branch 1 taken 2262 times.
 4488 if (block->new_rematrixing_strategy)
591 2226 flags = block->rematrixing_flags;
592 4488 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
593
2/2
✓ Branch 0 taken 17952 times.
✓ Branch 1 taken 4488 times.
 22440 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
594
2/2
✓ Branch 0 taken 9547 times.
✓ Branch 1 taken 8405 times.
 17952 if (flags[bnd]) {
595 9547 start = ff_ac3_rematrix_band_tab[bnd];
596 9547 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
597
2/2
✓ Branch 0 taken 215736 times.
✓ Branch 1 taken 9547 times.
 225283 for (i = start; i < end; i++) {
598 215736 int32_t lt = block->fixed_coef[1][i];
599 215736 int32_t rt = block->fixed_coef[2][i];
600 215736 block->fixed_coef[1][i] = (lt + rt) >> 1;
601 215736 block->fixed_coef[2][i] = (lt - rt) >> 1;
602 }
603 }
604 }
605 }
606 }
607
608
609 /*
610 * Initialize exponent tables.
611 */
612 13 static av_cold void exponent_init(void)
613 {
614 int expstr, i, grpsize;
615
616
2/2
✓ Branch 0 taken 39 times.
✓ Branch 1 taken 13 times.
 52 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
617 39 grpsize = 3 << expstr;
618
2/2
✓ Branch 0 taken 9516 times.
✓ Branch 1 taken 39 times.
 9555 for (i = 12; i < 256; i++) {
619 9516 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
620 9516 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
621 }
622 }
623 /* LFE */
624 13 exponent_group_tab[0][0][7] = 2;
625 13 }
626
627
628 /*
629 * Extract exponents from the MDCT coefficients.
630 */
631 1340 static void extract_exponents(AC3EncodeContext *s)
632 {
633 1340 int ch = !s->cpl_on;
634 1340 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
635 1340 AC3Block *block = &s->blocks[0];
636
637 1340 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
638 1340 }
639
640
641 /**
642 * Exponent Difference Threshold.
643 * New exponents are sent if their SAD exceed this number.
644 */
645 #define EXP_DIFF_THRESHOLD 500
646
647 /**
648 * Table used to select exponent strategy based on exponent reuse block interval.
649 */
650 static const uint8_t exp_strategy_reuse_tab[4][6] = {
651 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
652 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
653 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
654 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
655 };
656
657 /*
658 * Calculate exponent strategies for all channels.
659 * Array arrangement is reversed to simplify the per-channel calculation.
660 */
661 1340 static void compute_exp_strategy(AC3EncodeContext *s)
662 {
663 int ch, blk, blk1;
664
665
2/2
✓ Branch 0 taken 3099 times.
✓ Branch 1 taken 1340 times.
 4439 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
666 3099 uint8_t *exp_strategy = s->exp_strategy[ch];
667 3099 uint8_t *exp = s->blocks[0].exp[ch];
668 int exp_diff;
669
670 /* estimate if the exponent variation & decide if they should be
671 reused in the next frame */
672 3099 exp_strategy[0] = EXP_NEW;
673 3099 exp += AC3_MAX_COEFS;
674
2/2
✓ Branch 0 taken 15495 times.
✓ Branch 1 taken 3099 times.
 18594 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
675
2/2
✓ Branch 0 taken 3830 times.
✓ Branch 1 taken 11665 times.
 15495 if (ch == CPL_CH) {
676
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3830 times.
 3830 if (!s->blocks[blk-1].cpl_in_use) {
677 ✗ exp_strategy[blk] = EXP_NEW;
678 ✗ continue;
679
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3830 times.
 3830 } else if (!s->blocks[blk].cpl_in_use) {
680 ✗ exp_strategy[blk] = EXP_REUSE;
681 ✗ continue;
682 }
683
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11665 times.
 11665 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
684 ✗ exp_strategy[blk] = EXP_NEW;
685 ✗ continue;
686 }
687 15495 exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
688 15495 exp_strategy[blk] = EXP_REUSE;
689
4/4
✓ Branch 0 taken 3830 times.
✓ Branch 1 taken 11665 times.
✓ Branch 2 taken 764 times.
✓ Branch 3 taken 3066 times.
 15495 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
690 764 exp_strategy[blk] = EXP_NEW;
691
4/4
✓ Branch 0 taken 11665 times.
✓ Branch 1 taken 3066 times.
✓ Branch 2 taken 298 times.
✓ Branch 3 taken 11367 times.
 14731 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
692 298 exp_strategy[blk] = EXP_NEW;
693 }
694
695 /* now select the encoding strategy type : if exponents are often
696 recoded, we use a coarse encoding */
697 3099 blk = 0;
698
2/2
✓ Branch 0 taken 4161 times.
✓ Branch 1 taken 3099 times.
 7260 while (blk < s->num_blocks) {
699 4161 blk1 = blk + 1;
700
4/4
✓ Branch 0 taken 15495 times.
✓ Branch 1 taken 3099 times.
✓ Branch 2 taken 14433 times.
✓ Branch 3 taken 1062 times.
 18594 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
701 14433 blk1++;
702 4161 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
703 4161 blk = blk1;
704 }
705 }
706
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 1322 times.
 1340 if (s->lfe_on) {
707 18 ch = s->lfe_channel;
708 18 s->exp_strategy[ch][0] = EXP_D15;
709
2/2
✓ Branch 0 taken 90 times.
✓ Branch 1 taken 18 times.
 108 for (blk = 1; blk < s->num_blocks; blk++)
710 90 s->exp_strategy[ch][blk] = EXP_REUSE;
711 }
712
713 /* for E-AC-3, determine frame exponent strategy */
714
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 1067 times.
 1340 if (CONFIG_EAC3_ENCODER && s->eac3)
715 273 ff_eac3_get_frame_exp_strategy(s);
716 1340 }
717
718
719 /**
720 * Update the exponents so that they are the ones the decoder will decode.
721 *
722 * @param[in,out] exp array of exponents for 1 block in 1 channel
723 * @param nb_exps number of exponents in active bandwidth
724 * @param exp_strategy exponent strategy for the block
725 * @param cpl indicates if the block is in the coupling channel
726 */
727 4179 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
728 int cpl)
729 {
730 int nb_groups, i, k;
731
732 4179 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
733
734 /* for each group, compute the minimum exponent */
735
3/3
✓ Branch 0 taken 548 times.
✓ Branch 1 taken 772 times.
✓ Branch 2 taken 2859 times.
 4179 switch(exp_strategy) {
736 548 case EXP_D25:
737
2/2
✓ Branch 0 taken 25824 times.
✓ Branch 1 taken 548 times.
 26372 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
738 25824 uint8_t exp_min = exp[k];
739
2/2
✓ Branch 0 taken 8172 times.
✓ Branch 1 taken 17652 times.
 25824 if (exp[k+1] < exp_min)
740 8172 exp_min = exp[k+1];
741 25824 exp[i-cpl] = exp_min;
742 25824 k += 2;
743 }
744 548 break;
745 772 case EXP_D45:
746
2/2
✓ Branch 0 taken 17685 times.
✓ Branch 1 taken 772 times.
 18457 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
747 17685 uint8_t exp_min = exp[k];
748
2/2
✓ Branch 0 taken 6716 times.
✓ Branch 1 taken 10969 times.
 17685 if (exp[k+1] < exp_min)
749 6716 exp_min = exp[k+1];
750
2/2
✓ Branch 0 taken 3173 times.
✓ Branch 1 taken 14512 times.
 17685 if (exp[k+2] < exp_min)
751 3173 exp_min = exp[k+2];
752
2/2
✓ Branch 0 taken 2015 times.
✓ Branch 1 taken 15670 times.
 17685 if (exp[k+3] < exp_min)
753 2015 exp_min = exp[k+3];
754 17685 exp[i-cpl] = exp_min;
755 17685 k += 4;
756 }
757 772 break;
758 }
759
760 /* constraint for DC exponent */
761
4/4
✓ Branch 0 taken 2649 times.
✓ Branch 1 taken 1530 times.
✓ Branch 2 taken 1191 times.
✓ Branch 3 taken 1458 times.
 4179 if (!cpl && exp[0] > 15)
762 1191 exp[0] = 15;
763
764 /* decrease the delta between each groups to within 2 so that they can be
765 differentially encoded */
766
2/2
✓ Branch 0 taken 399105 times.
✓ Branch 1 taken 4179 times.
 403284 for (i = 1; i <= nb_groups; i++)
767 399105 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
768 4179 i--;
769
2/2
✓ Branch 0 taken 399105 times.
✓ Branch 1 taken 4179 times.
 403284 while (--i >= 0)
770 399105 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
771
772
2/2
✓ Branch 0 taken 1530 times.
✓ Branch 1 taken 2649 times.
 4179 if (cpl)
773 1530 exp[-1] = exp[0] & ~1;
774
775 /* now we have the exponent values the decoder will see */
776
3/3
✓ Branch 0 taken 548 times.
✓ Branch 1 taken 772 times.
✓ Branch 2 taken 2859 times.
 4179 switch (exp_strategy) {
777 548 case EXP_D25:
778
2/2
✓ Branch 0 taken 25824 times.
✓ Branch 1 taken 548 times.
 26372 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
779 25824 uint8_t exp1 = exp[i-cpl];
780 25824 exp[k--] = exp1;
781 25824 exp[k--] = exp1;
782 }
783 548 break;
784 772 case EXP_D45:
785
2/2
✓ Branch 0 taken 17685 times.
✓ Branch 1 taken 772 times.
 18457 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
786 17685 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
787 17685 k -= 4;
788 }
789 772 break;
790 }
791 4179 }
792
793
794 /*
795 * Encode exponents from original extracted form to what the decoder will see.
796 * This copies and groups exponents based on exponent strategy and reduces
797 * deltas between adjacent exponent groups so that they can be differentially
798 * encoded.
799 */
800 1340 static void encode_exponents(AC3EncodeContext *s)
801 {
802 int blk, blk1, ch, cpl;
803 uint8_t *exp, *exp_strategy;
804 int nb_coefs, num_reuse_blocks;
805
806
2/2
✓ Branch 0 taken 3117 times.
✓ Branch 1 taken 1340 times.
 4457 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
807 3117 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
808 3117 exp_strategy = s->exp_strategy[ch];
809
810 3117 cpl = (ch == CPL_CH);
811 3117 blk = 0;
812
2/2
✓ Branch 0 taken 4179 times.
✓ Branch 1 taken 3117 times.
 7296 while (blk < s->num_blocks) {
813 4179 AC3Block *block = &s->blocks[blk];
814
3/4
✓ Branch 0 taken 1530 times.
✓ Branch 1 taken 2649 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1530 times.
 4179 if (cpl && !block->cpl_in_use) {
815 ✗ exp += AC3_MAX_COEFS;
816 ✗ blk++;
817 ✗ continue;
818 }
819 4179 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
820 4179 blk1 = blk + 1;
821
822 /* count the number of EXP_REUSE blocks after the current block
823 and set exponent reference block numbers */
824 4179 s->exp_ref_block[ch][blk] = blk;
825
4/4
✓ Branch 0 taken 15585 times.
✓ Branch 1 taken 3117 times.
✓ Branch 2 taken 14523 times.
✓ Branch 3 taken 1062 times.
 18702 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
826 14523 s->exp_ref_block[ch][blk1] = blk;
827 14523 blk1++;
828 }
829 4179 num_reuse_blocks = blk1 - blk - 1;
830
831 /* for the EXP_REUSE case we select the min of the exponents */
832 4179 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
833 AC3_MAX_COEFS);
834
835 4179 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
836
837 4179 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
838 4179 blk = blk1;
839 }
840 }
841
842 /* reference block numbers have been changed, so reset ref_bap_set */
843 1340 s->ref_bap_set = 0;
844 1340 }
845
846
847 /*
848 * Count exponent bits based on bandwidth, coupling, and exponent strategies.
849 */
850 1340 static int count_exponent_bits(AC3EncodeContext *s)
851 {
852 int blk, ch;
853 int nb_groups, bit_count;
854
855 1340 bit_count = 0;
856
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
857 8040 AC3Block *block = &s->blocks[blk];
858
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
859 18702 int exp_strategy = s->exp_strategy[ch][blk];
860 18702 int cpl = (ch == CPL_CH);
861 18702 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
862
863
2/2
✓ Branch 0 taken 14523 times.
✓ Branch 1 taken 4179 times.
 18702 if (exp_strategy == EXP_REUSE)
864 14523 continue;
865
866 4179 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
867 4179 bit_count += 4 + (nb_groups * 7);
868 }
869 }
870
871 1340 return bit_count;
872 }
873
874
875 /**
876 * Group exponents.
877 * 3 delta-encoded exponents are in each 7-bit group. The number of groups
878 * varies depending on exponent strategy and bandwidth.
879 *
880 * @param s AC-3 encoder private context
881 */
882 1340 static void ac3_group_exponents(AC3EncodeContext *s)
883 {
884 int blk, ch, i, cpl;
885 int group_size, nb_groups;
886 uint8_t *p;
887 int delta0, delta1, delta2;
888 int exp0, exp1;
889
890
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
891 8040 AC3Block *block = &s->blocks[blk];
892
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
893 18702 int exp_strategy = s->exp_strategy[ch][blk];
894
2/2
✓ Branch 0 taken 14523 times.
✓ Branch 1 taken 4179 times.
 18702 if (exp_strategy == EXP_REUSE)
895 14523 continue;
896 4179 cpl = (ch == CPL_CH);
897 4179 group_size = exp_strategy + (exp_strategy == EXP_D45);
898 4179 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
899 4179 p = block->exp[ch] + s->start_freq[ch] - cpl;
900
901 /* DC exponent */
902 4179 exp1 = *p++;
903 4179 block->grouped_exp[ch][0] = exp1;
904
905 /* remaining exponents are delta encoded */
906
2/2
✓ Branch 0 taken 133035 times.
✓ Branch 1 taken 4179 times.
 137214 for (i = 1; i <= nb_groups; i++) {
907 /* merge three delta in one code */
908 133035 exp0 = exp1;
909 133035 exp1 = p[0];
910 133035 p += group_size;
911 133035 delta0 = exp1 - exp0 + 2;
912 av_assert2(delta0 >= 0 && delta0 <= 4);
913
914 133035 exp0 = exp1;
915 133035 exp1 = p[0];
916 133035 p += group_size;
917 133035 delta1 = exp1 - exp0 + 2;
918 av_assert2(delta1 >= 0 && delta1 <= 4);
919
920 133035 exp0 = exp1;
921 133035 exp1 = p[0];
922 133035 p += group_size;
923 133035 delta2 = exp1 - exp0 + 2;
924 av_assert2(delta2 >= 0 && delta2 <= 4);
925
926 133035 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
927 }
928 }
929 }
930 1340 }
931
932
933 /**
934 * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
935 * Extract exponents from MDCT coefficients, calculate exponent strategies,
936 * and encode final exponents.
937 *
938 * @param s AC-3 encoder private context
939 */
940 1340 static void ac3_process_exponents(AC3EncodeContext *s)
941 {
942 1340 extract_exponents(s);
943
944 1340 compute_exp_strategy(s);
945
946 1340 encode_exponents(s);
947 1340 }
948
949
950 /*
951 * Count frame bits that are based solely on fixed parameters.
952 * This only has to be run once when the encoder is initialized.
953 */
954 13 static void count_frame_bits_fixed(AC3EncodeContext *s)
955 {
956 static const uint8_t frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
957 int blk;
958 int frame_bits;
959
960 /* assumptions:
961 * no dynamic range codes
962 * bit allocation parameters do not change between blocks
963 * no delta bit allocation
964 * no skipped data
965 * no auxiliary data
966 * no E-AC-3 metadata
967 */
968
969 /* header */
970 13 frame_bits = 16; /* sync info */
971
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
 13 if (s->eac3) {
972 /* bitstream info header */
973 1 frame_bits += 35;
974 1 frame_bits += 1 + 1;
975
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->num_blocks != 0x6)
976 ✗ frame_bits++;
977 1 frame_bits++;
978 /* audio frame header */
979
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->num_blocks == 6)
980 1 frame_bits += 2;
981 1 frame_bits += 10;
982 /* exponent strategy */
983
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->use_frame_exp_strategy)
984 ✗ frame_bits += 5 * s->fbw_channels;
985 else
986 1 frame_bits += s->num_blocks * 2 * s->fbw_channels;
987
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->lfe_on)
988 ✗ frame_bits += s->num_blocks;
989 /* converter exponent strategy */
990
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->num_blks_code != 0x3)
991 ✗ frame_bits++;
992 else
993 1 frame_bits += s->fbw_channels * 5;
994 /* snr offsets */
995 1 frame_bits += 10;
996 /* block start info */
997
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->num_blocks != 1)
998 1 frame_bits++;
999 } else {
1000 12 frame_bits += 49;
1001 12 frame_bits += frame_bits_inc[s->channel_mode];
1002 }
1003
1004 /* audio blocks */
1005
2/2
✓ Branch 0 taken 78 times.
✓ Branch 1 taken 13 times.
 91 for (blk = 0; blk < s->num_blocks; blk++) {
1006
2/2
✓ Branch 0 taken 72 times.
✓ Branch 1 taken 6 times.
 78 if (!s->eac3) {
1007 /* block switch flags */
1008 72 frame_bits += s->fbw_channels;
1009
1010 /* dither flags */
1011 72 frame_bits += s->fbw_channels;
1012 }
1013
1014 /* dynamic range */
1015 78 frame_bits++;
1016
1017 /* spectral extension */
1018
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 72 times.
 78 if (s->eac3)
1019 6 frame_bits++;
1020
1021 /* coupling strategy exists: cplstre */
1022
2/2
✓ Branch 0 taken 72 times.
✓ Branch 1 taken 6 times.
 78 if (!s->eac3)
1023 72 frame_bits++;
1024
1025
2/2
✓ Branch 0 taken 72 times.
✓ Branch 1 taken 6 times.
 78 if (!s->eac3) {
1026 /* exponent strategy */
1027 72 frame_bits += 2 * s->fbw_channels;
1028
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 60 times.
 72 if (s->lfe_on)
1029 12 frame_bits++;
1030
1031 /* bit allocation params */
1032 72 frame_bits++;
1033
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 60 times.
 72 if (!blk)
1034 12 frame_bits += 2 + 2 + 2 + 2 + 3;
1035 }
1036
1037 /* snroffste for AC-3, convsnroffste for E-AC-3 */
1038 78 frame_bits++;
1039
1040
2/2
✓ Branch 0 taken 72 times.
✓ Branch 1 taken 6 times.
 78 if (!s->eac3) {
1041 /* delta bit allocation */
1042 72 frame_bits++;
1043
1044 /* skipped data */
1045 72 frame_bits++;
1046 }
1047 }
1048
1049 /* auxiliary data */
1050 13 frame_bits++;
1051
1052 /* CRC */
1053 13 frame_bits += 1 + 16;
1054
1055 13 s->frame_bits_fixed = frame_bits;
1056 13 }
1057
1058
1059 /*
1060 * Initialize bit allocation.
1061 * Set default parameter codes and calculate parameter values.
1062 */
1063 13 static av_cold void bit_alloc_init(AC3EncodeContext *s)
1064 {
1065 int ch;
1066
1067 /* init default parameters */
1068 13 s->slow_decay_code = 2;
1069 13 s->fast_decay_code = 1;
1070 13 s->slow_gain_code = 1;
1071
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
 13 s->db_per_bit_code = s->eac3 ? 2 : 3;
1072 13 s->floor_code = 7;
1073
2/2
✓ Branch 0 taken 41 times.
✓ Branch 1 taken 13 times.
 54 for (ch = 0; ch <= s->channels; ch++)
1074 41 s->fast_gain_code[ch] = 4;
1075
1076 /* initial snr offset */
1077 13 s->coarse_snr_offset = 40;
1078
1079 /* compute real values */
1080 /* currently none of these values change during encoding, so we can just
1081 set them once at initialization */
1082 13 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code];
1083 13 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code];
1084 13 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
1085 13 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
1086 13 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
1087 13 s->bit_alloc.cpl_fast_leak = 0;
1088 13 s->bit_alloc.cpl_slow_leak = 0;
1089
1090 13 count_frame_bits_fixed(s);
1091 13 }
1092
1093
1094 /*
1095 * Count the bits used to encode the frame, minus exponents and mantissas.
1096 * Bits based on fixed parameters have already been counted, so now we just
1097 * have to add the bits based on parameters that change during encoding.
1098 */
1099 1340 static void count_frame_bits(AC3EncodeContext *s)
1100 {
1101 1340 AC3EncOptions *opt = &s->options;
1102 int blk, ch;
1103 1340 int frame_bits = 0;
1104
1105 /* header */
1106
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 1067 times.
 1340 if (s->eac3) {
1107
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 273 times.
 273 if (opt->eac3_mixing_metadata) {
1108 ✗ if (s->channel_mode > AC3_CHMODE_STEREO)
1109 ✗ frame_bits += 2;
1110 ✗ if (s->has_center)
1111 ✗ frame_bits += 6;
1112 ✗ if (s->has_surround)
1113 ✗ frame_bits += 6;
1114 ✗ frame_bits += s->lfe_on;
1115 ✗ frame_bits += 1 + 1 + 2;
1116 ✗ if (s->channel_mode < AC3_CHMODE_STEREO)
1117 ✗ frame_bits++;
1118 ✗ frame_bits++;
1119 }
1120
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 273 times.
 273 if (opt->eac3_info_metadata) {
1121 ✗ frame_bits += 3 + 1 + 1;
1122 ✗ if (s->channel_mode == AC3_CHMODE_STEREO)
1123 ✗ frame_bits += 2 + 2;
1124 ✗ if (s->channel_mode >= AC3_CHMODE_2F2R)
1125 ✗ frame_bits += 2;
1126 ✗ frame_bits++;
1127 ✗ if (opt->audio_production_info)
1128 ✗ frame_bits += 5 + 2 + 1;
1129 ✗ frame_bits++;
1130 }
1131 /* coupling */
1132
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->channel_mode > AC3_CHMODE_MONO) {
1133 273 frame_bits++;
1134
2/2
✓ Branch 0 taken 1365 times.
✓ Branch 1 taken 273 times.
 1638 for (blk = 1; blk < s->num_blocks; blk++) {
1135 1365 AC3Block *block = &s->blocks[blk];
1136 1365 frame_bits++;
1137
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1365 times.
 1365 if (block->new_cpl_strategy)
1138 ✗ frame_bits++;
1139 }
1140 }
1141 /* coupling exponent strategy */
1142
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->cpl_on) {
1143
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->use_frame_exp_strategy) {
1144 273 frame_bits += 5;
1145 } else {
1146 ✗ for (blk = 0; blk < s->num_blocks; blk++)
1147 ✗ frame_bits += 2 * s->blocks[blk].cpl_in_use;
1148 }
1149 }
1150 } else {
1151
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1067 times.
 1067 if (opt->audio_production_info)
1152 ✗ frame_bits += 7;
1153
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1067 times.
 1067 if (s->bitstream_id == 6) {
1154 ✗ if (opt->extended_bsi_1)
1155 ✗ frame_bits += 14;
1156 ✗ if (opt->extended_bsi_2)
1157 ✗ frame_bits += 14;
1158 }
1159 }
1160
1161 /* audio blocks */
1162
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
1163 8040 AC3Block *block = &s->blocks[blk];
1164
1165 /* coupling strategy */
1166
2/2
✓ Branch 0 taken 1340 times.
✓ Branch 1 taken 6700 times.
 8040 if (block->new_cpl_strategy) {
1167
2/2
✓ Branch 0 taken 1067 times.
✓ Branch 1 taken 273 times.
 1340 if (!s->eac3)
1168 1067 frame_bits++;
1169
2/2
✓ Branch 0 taken 766 times.
✓ Branch 1 taken 574 times.
 1340 if (block->cpl_in_use) {
1170
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
 766 if (s->eac3)
1171 273 frame_bits++;
1172
3/4
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 273 times.
 766 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
1173 493 frame_bits += s->fbw_channels;
1174
2/2
✓ Branch 0 taken 748 times.
✓ Branch 1 taken 18 times.
 766 if (s->channel_mode == AC3_CHMODE_STEREO)
1175 748 frame_bits++;
1176 766 frame_bits += 4 + 4;
1177
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
 766 if (s->eac3)
1178 273 frame_bits++;
1179 else
1180 493 frame_bits += s->num_cpl_subbands - 1;
1181 }
1182 }
1183
1184 /* coupling coordinates */
1185
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 3444 times.
 8040 if (block->cpl_in_use) {
1186
2/2
✓ Branch 0 taken 9516 times.
✓ Branch 1 taken 4596 times.
 14112 for (ch = 1; ch <= s->fbw_channels; ch++) {
1187
1/2
✓ Branch 0 taken 9516 times.
✗ Branch 1 not taken.
 9516 if (block->channel_in_cpl[ch]) {
1188
4/4
✓ Branch 0 taken 3276 times.
✓ Branch 1 taken 6240 times.
✓ Branch 2 taken 2730 times.
✓ Branch 3 taken 546 times.
 9516 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1189 8970 frame_bits++;
1190
2/2
✓ Branch 0 taken 1634 times.
✓ Branch 1 taken 7882 times.
 9516 if (block->new_cpl_coords[ch]) {
1191 1634 frame_bits += 2;
1192 1634 frame_bits += (4 + 4) * s->num_cpl_bands;
1193 }
1194 }
1195 }
1196 }
1197
1198 /* stereo rematrixing */
1199
2/2
✓ Branch 0 taken 5526 times.
✓ Branch 1 taken 2514 times.
 8040 if (s->channel_mode == AC3_CHMODE_STEREO) {
1200
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 3888 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 5526 if (!s->eac3 || blk > 0)
1201 5253 frame_bits++;
1202
2/2
✓ Branch 0 taken 2399 times.
✓ Branch 1 taken 3127 times.
 5526 if (s->blocks[blk].new_rematrixing_strategy)
1203 2399 frame_bits += block->num_rematrixing_bands;
1204 }
1205
1206 /* bandwidth codes & gain range */
1207
2/2
✓ Branch 0 taken 13998 times.
✓ Branch 1 taken 8040 times.
 22038 for (ch = 1; ch <= s->fbw_channels; ch++) {
1208
2/2
✓ Branch 0 taken 2631 times.
✓ Branch 1 taken 11367 times.
 13998 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1209
2/2
✓ Branch 0 taken 929 times.
✓ Branch 1 taken 1702 times.
 2631 if (!block->channel_in_cpl[ch])
1210 929 frame_bits += 6;
1211 2631 frame_bits += 2;
1212 }
1213 }
1214
1215 /* coupling exponent strategy */
1216
4/4
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
✓ Branch 2 taken 2958 times.
✓ Branch 3 taken 3444 times.
 8040 if (!s->eac3 && block->cpl_in_use)
1217 2958 frame_bits += 2;
1218
1219 /* snr offsets and fast gain codes */
1220
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1221
2/2
✓ Branch 0 taken 1067 times.
✓ Branch 1 taken 5335 times.
 6402 if (block->new_snr_offsets)
1222 1067 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
1223 }
1224
1225 /* coupling leak info */
1226
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 3444 times.
 8040 if (block->cpl_in_use) {
1227
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2958 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4596 if (!s->eac3 || block->new_cpl_leak != 2)
1228 4323 frame_bits++;
1229
2/2
✓ Branch 0 taken 766 times.
✓ Branch 1 taken 3830 times.
 4596 if (block->new_cpl_leak)
1230 766 frame_bits += 3 + 3;
1231 }
1232 }
1233
1234 1340 s->frame_bits = s->frame_bits_fixed + frame_bits;
1235 1340 }
1236
1237
1238 /*
1239 * Calculate masking curve based on the final exponents.
1240 * Also calculate the power spectral densities to use in future calculations.
1241 */
1242 1340 static void bit_alloc_masking(AC3EncodeContext *s)
1243 {
1244 int blk, ch;
1245
1246
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
1247 8040 AC3Block *block = &s->blocks[blk];
1248
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1249 /* We only need psd and mask for calculating bap.
1250 Since we currently do not calculate bap when exponent
1251 strategy is EXP_REUSE we do not need to calculate psd or mask. */
1252
2/2
✓ Branch 0 taken 4179 times.
✓ Branch 1 taken 14523 times.
 18702 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1253 4179 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
1254 block->end_freq[ch], block->psd[ch],
1255 block->band_psd[ch]);
1256 4179 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
1257 s->start_freq[ch], block->end_freq[ch],
1258 4179 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
1259 4179 ch == s->lfe_channel,
1260 DBA_NONE, 0, NULL, NULL, NULL,
1261 block->mask[ch]);
1262 }
1263 }
1264 }
1265 1340 }
1266
1267
1268 /*
1269 * Ensure that bap for each block and channel point to the current bap_buffer.
1270 * They may have been switched during the bit allocation search.
1271 */
1272 12702 static void reset_block_bap(AC3EncodeContext *s)
1273 {
1274 int blk, ch;
1275 uint8_t *ref_bap;
1276
1277
4/4
✓ Branch 0 taken 5663 times.
✓ Branch 1 taken 7039 times.
✓ Branch 2 taken 4336 times.
✓ Branch 3 taken 1327 times.
 12702 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
1278 4336 return;
1279
1280 8366 ref_bap = s->bap_buffer;
1281
2/2
✓ Branch 0 taken 22959 times.
✓ Branch 1 taken 8366 times.
 31325 for (ch = 0; ch <= s->channels; ch++) {
1282
2/2
✓ Branch 0 taken 137754 times.
✓ Branch 1 taken 22959 times.
 160713 for (blk = 0; blk < s->num_blocks; blk++)
1283 137754 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
1284 22959 ref_bap += AC3_MAX_COEFS * s->num_blocks;
1285 }
1286 8366 s->ref_bap_set = 1;
1287 }
1288
1289
1290 /**
1291 * Initialize mantissa counts.
1292 * These are set so that they are padded to the next whole group size when bits
1293 * are counted in compute_mantissa_size.
1294 *
1295 * @param[in,out] mant_cnt running counts for each bap value for each block
1296 */
1297 11362 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
1298 {
1299 int blk;
1300
1301
2/2
✓ Branch 0 taken 68172 times.
✓ Branch 1 taken 11362 times.
 79534 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
1302 68172 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
1303 68172 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
1304 68172 mant_cnt[blk][4] = 1;
1305 }
1306 11362 }
1307
1308
1309 /**
1310 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
1311 * range.
1312 *
1313 * @param s AC-3 encoder private context
1314 * @param ch channel index
1315 * @param[in,out] mant_cnt running counts for each bap value for each block
1316 * @param start starting coefficient bin
1317 * @param end ending coefficient bin
1318 */
1319 26262 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
1320 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
1321 int start, int end)
1322 {
1323 int blk;
1324
1325
2/2
✓ Branch 0 taken 157572 times.
✓ Branch 1 taken 26262 times.
 183834 for (blk = 0; blk < s->num_blocks; blk++) {
1326 157572 AC3Block *block = &s->blocks[blk];
1327
3/4
✓ Branch 0 taken 38298 times.
✓ Branch 1 taken 119274 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 38298 times.
 157572 if (ch == CPL_CH && !block->cpl_in_use)
1328 ✗ continue;
1329 157572 s->ac3dsp.update_bap_counts(mant_cnt[blk],
1330 157572 s->ref_bap[ch][blk] + start,
1331 157572 FFMIN(end, block->end_freq[ch]) - start);
1332 }
1333 26262 }
1334
1335
1336 /*
1337 * Count the number of mantissa bits in the frame based on the bap values.
1338 */
1339 11362 static int count_mantissa_bits(AC3EncodeContext *s)
1340 {
1341 int ch, max_end_freq;
1342 11362 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
1343
1344 11362 count_mantissa_bits_init(mant_cnt);
1345
1346 11362 max_end_freq = s->bandwidth_code * 3 + 73;
1347
2/2
✓ Branch 0 taken 26262 times.
✓ Branch 1 taken 11362 times.
 37624 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
1348 26262 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
1349 max_end_freq);
1350
1351 11362 return s->ac3dsp.compute_mantissa_size(mant_cnt);
1352 }
1353
1354
1355 /**
1356 * Run the bit allocation with a given SNR offset.
1357 * This calculates the bit allocation pointers that will be used to determine
1358 * the quantization of each mantissa.
1359 *
1360 * @param s AC-3 encoder private context
1361 * @param snr_offset SNR offset, 0 to 1023
1362 * @return the number of bits needed for mantissas if the given SNR offset is
1363 * is used.
1364 */
1365 11362 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
1366 {
1367 int blk, ch;
1368
1369 11362 snr_offset = (snr_offset - 240) * 4;
1370
1371 11362 reset_block_bap(s);
1372
2/2
✓ Branch 0 taken 68172 times.
✓ Branch 1 taken 11362 times.
 79534 for (blk = 0; blk < s->num_blocks; blk++) {
1373 68172 AC3Block *block = &s->blocks[blk];
1374
1375
2/2
✓ Branch 0 taken 157572 times.
✓ Branch 1 taken 68172 times.
 225744 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1376 /* Currently the only bit allocation parameters which vary across
1377 blocks within a frame are the exponent values. We can take
1378 advantage of that by reusing the bit allocation pointers
1379 whenever we reuse exponents. */
1380
2/2
✓ Branch 0 taken 35622 times.
✓ Branch 1 taken 121950 times.
 157572 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1381 35622 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
1382 s->start_freq[ch], block->end_freq[ch],
1383 snr_offset, s->bit_alloc.floor,
1384 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
1385 }
1386 }
1387 }
1388 11362 return count_mantissa_bits(s);
1389 }
1390
1391
1392 /*
1393 * Constant bitrate bit allocation search.
1394 * Find the largest SNR offset that will allow data to fit in the frame.
1395 */
1396 1340 static int cbr_bit_allocation(AC3EncodeContext *s)
1397 {
1398 int ch;
1399 int bits_left;
1400 int snr_offset, snr_incr;
1401
1402 1340 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
1403
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (bits_left < 0)
1404 ✗ return AVERROR(EINVAL);
1405
1406 1340 snr_offset = s->coarse_snr_offset << 4;
1407
1408 /* if previous frame SNR offset was 1023, check if current frame can also
1409 use SNR offset of 1023. if so, skip the search. */
1410
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
1411 ✗ if (bit_alloc(s, 1023) <= bits_left)
1412 ✗ return 0;
1413 }
1414
1415
3/4
✓ Branch 0 taken 1656 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 316 times.
✓ Branch 3 taken 1340 times.
 3312 while (snr_offset >= 0 &&
1416 1656 bit_alloc(s, snr_offset) > bits_left) {
1417 316 snr_offset -= 64;
1418 }
1419
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (snr_offset < 0)
1420 ✗ return AVERROR(EINVAL);
1421
1422 1340 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1423
2/2
✓ Branch 0 taken 5360 times.
✓ Branch 1 taken 1340 times.
 6700 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
1424
3/4
✓ Branch 0 taken 9706 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 4346 times.
✓ Branch 3 taken 5360 times.
 19412 while (snr_offset + snr_incr <= 1023 &&
1425 9706 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
1426 4346 snr_offset += snr_incr;
1427 4346 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1428 }
1429 }
1430 1340 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1431 1340 reset_block_bap(s);
1432
1433 1340 s->coarse_snr_offset = snr_offset >> 4;
1434
2/2
✓ Branch 0 taken 3117 times.
✓ Branch 1 taken 1340 times.
 4457 for (ch = !s->cpl_on; ch <= s->channels; ch++)
1435 3117 s->fine_snr_offset[ch] = snr_offset & 0xF;
1436
1437 1340 return 0;
1438 }
1439
1440
1441 /*
1442 * Perform bit allocation search.
1443 * Finds the SNR offset value that maximizes quality and fits in the specified
1444 * frame size. Output is the SNR offset and a set of bit allocation pointers
1445 * used to quantize the mantissas.
1446 */
1447 1340 static int ac3_compute_bit_allocation(AC3EncodeContext *s)
1448 {
1449 1340 count_frame_bits(s);
1450
1451 1340 s->exponent_bits = count_exponent_bits(s);
1452
1453 1340 bit_alloc_masking(s);
1454
1455 1340 return cbr_bit_allocation(s);
1456 }
1457
1458
1459 /**
1460 * Symmetric quantization on 'levels' levels.
1461 *
1462 * @param c unquantized coefficient
1463 * @param e exponent
1464 * @param levels number of quantization levels
1465 * @return quantized coefficient
1466 */
1467 1240618 static inline int sym_quant(int c, int e, int levels)
1468 {
1469 1240618 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
1470 av_assert2(v >= 0 && v < levels);
1471 1240618 return v;
1472 }
1473
1474
1475 /**
1476 * Asymmetric quantization on 2^qbits levels.
1477 *
1478 * @param c unquantized coefficient
1479 * @param e exponent
1480 * @param qbits number of quantization bits
1481 * @return quantized coefficient
1482 */
1483 211241 static inline int asym_quant(int c, int e, int qbits)
1484 {
1485 int m;
1486
1487 211241 c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
1488 211241 m = (1 << (qbits-1));
1489
2/2
✓ Branch 0 taken 186 times.
✓ Branch 1 taken 211055 times.
 211241 if (c >= m)
1490 186 c = m - 1;
1491 av_assert2(c >= -m);
1492 211241 return c;
1493 }
1494
1495
1496 /**
1497 * Quantize a set of mantissas for a single channel in a single block.
1498 *
1499 * @param s Mantissa count context
1500 * @param fixed_coef unquantized fixed-point coefficients
1501 * @param exp exponents
1502 * @param bap bit allocation pointer indices
1503 * @param[out] qmant quantized coefficients
1504 * @param start_freq starting coefficient bin
1505 * @param end_freq ending coefficient bin
1506 */
1507 18702 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
1508 uint8_t *exp, uint8_t *bap,
1509 int16_t *qmant, int start_freq,
1510 int end_freq)
1511 {
1512 int i;
1513
1514
2/2
✓ Branch 0 taken 2289882 times.
✓ Branch 1 taken 18702 times.
 2308584 for (i = start_freq; i < end_freq; i++) {
1515 2289882 int c = fixed_coef[i];
1516 2289882 int e = exp[i];
1517 2289882 int v = bap[i];
1518
9/9
✓ Branch 0 taken 838023 times.
✓ Branch 1 taken 630664 times.
✓ Branch 2 taken 213986 times.
✓ Branch 3 taken 229915 times.
✓ Branch 4 taken 97238 times.
✓ Branch 5 taken 68815 times.
✓ Branch 6 taken 19694 times.
✓ Branch 7 taken 13386 times.
✓ Branch 8 taken 178161 times.
 2289882 switch (v) {
1519 838023 case 0:
1520 838023 break;
1521 630664 case 1:
1522 630664 v = sym_quant(c, e, 3);
1523
3/3
✓ Branch 0 taken 212621 times.
✓ Branch 1 taken 210364 times.
✓ Branch 2 taken 207679 times.
 630664 switch (s->mant1_cnt) {
1524 212621 case 0:
1525 212621 s->qmant1_ptr = &qmant[i];
1526 212621 v = 9 * v;
1527 212621 s->mant1_cnt = 1;
1528 212621 break;
1529 210364 case 1:
1530 210364 *s->qmant1_ptr += 3 * v;
1531 210364 s->mant1_cnt = 2;
1532 210364 v = 128;
1533 210364 break;
1534 207679 default:
1535 207679 *s->qmant1_ptr += v;
1536 207679 s->mant1_cnt = 0;
1537 207679 v = 128;
1538 207679 break;
1539 }
1540 630664 break;
1541 213986 case 2:
1542 213986 v = sym_quant(c, e, 5);
1543
3/3
✓ Branch 0 taken 73663 times.
✓ Branch 1 taken 71376 times.
✓ Branch 2 taken 68947 times.
 213986 switch (s->mant2_cnt) {
1544 73663 case 0:
1545 73663 s->qmant2_ptr = &qmant[i];
1546 73663 v = 25 * v;
1547 73663 s->mant2_cnt = 1;
1548 73663 break;
1549 71376 case 1:
1550 71376 *s->qmant2_ptr += 5 * v;
1551 71376 s->mant2_cnt = 2;
1552 71376 v = 128;
1553 71376 break;
1554 68947 default:
1555 68947 *s->qmant2_ptr += v;
1556 68947 s->mant2_cnt = 0;
1557 68947 v = 128;
1558 68947 break;
1559 }
1560 213986 break;
1561 229915 case 3:
1562 229915 v = sym_quant(c, e, 7);
1563 229915 break;
1564 97238 case 4:
1565 97238 v = sym_quant(c, e, 11);
1566
2/2
✓ Branch 0 taken 49903 times.
✓ Branch 1 taken 47335 times.
 97238 switch (s->mant4_cnt) {
1567 49903 case 0:
1568 49903 s->qmant4_ptr = &qmant[i];
1569 49903 v = 11 * v;
1570 49903 s->mant4_cnt = 1;
1571 49903 break;
1572 47335 default:
1573 47335 *s->qmant4_ptr += v;
1574 47335 s->mant4_cnt = 0;
1575 47335 v = 128;
1576 47335 break;
1577 }
1578 97238 break;
1579 68815 case 5:
1580 68815 v = sym_quant(c, e, 15);
1581 68815 break;
1582 19694 case 14:
1583 19694 v = asym_quant(c, e, 14);
1584 19694 break;
1585 13386 case 15:
1586 13386 v = asym_quant(c, e, 16);
1587 13386 break;
1588 178161 default:
1589 178161 v = asym_quant(c, e, v - 1);
1590 178161 break;
1591 }
1592 2289882 qmant[i] = v;
1593 }
1594 18702 }
1595
1596
1597 /**
1598 * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
1599 *
1600 * @param s AC-3 encoder private context
1601 */
1602 1340 static void ac3_quantize_mantissas(AC3EncodeContext *s)
1603 {
1604 1340 int blk, ch, ch0=0, got_cpl;
1605
1606
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++) {
1607 8040 AC3Block *block = &s->blocks[blk];
1608 8040 AC3Mant m = { 0 };
1609
1610 8040 got_cpl = !block->cpl_in_use;
1611
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = 1; ch <= s->channels; ch++) {
1612
5/6
✓ Branch 0 taken 9192 times.
✓ Branch 1 taken 9510 times.
✓ Branch 2 taken 4596 times.
✓ Branch 3 taken 4596 times.
✓ Branch 4 taken 4596 times.
✗ Branch 5 not taken.
 18702 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1613 4596 ch0 = ch - 1;
1614 4596 ch = CPL_CH;
1615 4596 got_cpl = 1;
1616 }
1617 18702 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
1618 18702 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
1619 18702 s->ref_bap[ch][blk], block->qmant[ch],
1620 s->start_freq[ch], block->end_freq[ch]);
1621
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 14106 times.
 18702 if (ch == CPL_CH)
1622 4596 ch = ch0;
1623 }
1624 }
1625 1340 }
1626
1627
1628 /*
1629 * Write the AC-3 frame header to the output bitstream.
1630 */
1631 1067 static void ac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb)
1632 {
1633 1067 AC3EncOptions *opt = &s->options;
1634
1635 1067 put_bits_assume_flushed(pb);
1636
1637 1067 put_bits(pb, 16, 0x0b77); /* frame header */
1638 1067 put_bits(pb, 16, 0); /* crc1: will be filled later */
1639 1067 put_bits(pb, 2, s->bit_alloc.sr_code);
1640 1067 put_bits(pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
1641 1067 put_bits(pb, 5, s->bitstream_id);
1642 1067 put_bits(pb, 3, s->bitstream_mode);
1643 1067 put_bits(pb, 3, s->channel_mode);
1644
4/4
✓ Branch 0 taken 419 times.
✓ Branch 1 taken 648 times.
✓ Branch 2 taken 18 times.
✓ Branch 3 taken 401 times.
 1067 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
1645 18 put_bits(pb, 2, s->center_mix_level);
1646
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 1049 times.
 1067 if (s->channel_mode & 0x04)
1647 18 put_bits(pb, 2, s->surround_mix_level);
1648
2/2
✓ Branch 0 taken 648 times.
✓ Branch 1 taken 419 times.
 1067 if (s->channel_mode == AC3_CHMODE_STEREO)
1649 648 put_bits(pb, 2, opt->dolby_surround_mode);
1650 1067 put_bits(pb, 1, s->lfe_on); /* LFE */
1651 1067 put_bits(pb, 5, -opt->dialogue_level);
1652 1067 put_bits(pb, 1, 0); /* no compression control word */
1653 1067 put_bits(pb, 1, 0); /* no lang code */
1654 1067 put_bits(pb, 1, opt->audio_production_info);
1655
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1067 times.
 1067 if (opt->audio_production_info) {
1656 ✗ put_bits(pb, 5, opt->mixing_level - 80);
1657 ✗ put_bits(pb, 2, opt->room_type);
1658 }
1659 1067 put_bits(pb, 1, opt->copyright);
1660 1067 put_bits(pb, 1, opt->original);
1661
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1067 times.
 1067 if (s->bitstream_id == 6) {
1662 /* alternate bit stream syntax */
1663 ✗ put_bits(pb, 1, opt->extended_bsi_1);
1664 ✗ if (opt->extended_bsi_1) {
1665 ✗ put_bits(pb, 2, opt->preferred_stereo_downmix);
1666 ✗ put_bits(pb, 3, s->ltrt_center_mix_level);
1667 ✗ put_bits(pb, 3, s->ltrt_surround_mix_level);
1668 ✗ put_bits(pb, 3, s->loro_center_mix_level);
1669 ✗ put_bits(pb, 3, s->loro_surround_mix_level);
1670 }
1671 ✗ put_bits(pb, 1, opt->extended_bsi_2);
1672 ✗ if (opt->extended_bsi_2) {
1673 ✗ put_bits(pb, 2, opt->dolby_surround_ex_mode);
1674 ✗ put_bits(pb, 2, opt->dolby_headphone_mode);
1675 ✗ put_bits(pb, 1, opt->ad_converter_type);
1676 ✗ put_bits(pb, 9, 0); /* xbsi2 and encinfo : reserved */
1677 }
1678 } else {
1679 1067 put_bits(pb, 1, 0); /* no time code 1 */
1680 1067 put_bits(pb, 1, 0); /* no time code 2 */
1681 }
1682 1067 put_bits(pb, 1, 0); /* no additional bit stream info */
1683 1067 }
1684
1685
1686 /*
1687 * Write one audio block to the output bitstream.
1688 */
1689 8040 static void output_audio_block(AC3EncodeContext *s, PutBitContext *pb, int blk)
1690 {
1691 8040 int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
1692 8040 AC3Block *block = &s->blocks[blk];
1693
1694 /* block switching */
1695
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1696
2/2
✓ Branch 0 taken 10722 times.
✓ Branch 1 taken 6402 times.
 17124 for (ch = 0; ch < s->fbw_channels; ch++)
1697 10722 put_bits(pb, 1, 0);
1698 }
1699
1700 /* dither flags */
1701
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1702
2/2
✓ Branch 0 taken 10722 times.
✓ Branch 1 taken 6402 times.
 17124 for (ch = 0; ch < s->fbw_channels; ch++)
1703 10722 put_bits(pb, 1, 1);
1704 }
1705
1706 /* dynamic range codes */
1707 8040 put_bits(pb, 1, 0);
1708
1709 /* spectral extension */
1710
2/2
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 6402 times.
 8040 if (s->eac3)
1711 1638 put_bits(pb, 1, 0);
1712
1713 /* channel coupling */
1714
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3)
1715 6402 put_bits(pb, 1, block->new_cpl_strategy);
1716
2/2
✓ Branch 0 taken 1340 times.
✓ Branch 1 taken 6700 times.
 8040 if (block->new_cpl_strategy) {
1717
2/2
✓ Branch 0 taken 1067 times.
✓ Branch 1 taken 273 times.
 1340 if (!s->eac3)
1718 1067 put_bits(pb, 1, block->cpl_in_use);
1719
2/2
✓ Branch 0 taken 766 times.
✓ Branch 1 taken 574 times.
 1340 if (block->cpl_in_use) {
1720 int start_sub, end_sub;
1721
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
 766 if (s->eac3)
1722 273 put_bits(pb, 1, 0); /* enhanced coupling */
1723
3/4
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 273 times.
 766 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
1724
2/2
✓ Branch 0 taken 1040 times.
✓ Branch 1 taken 493 times.
 1533 for (ch = 1; ch <= s->fbw_channels; ch++)
1725 1040 put_bits(pb, 1, block->channel_in_cpl[ch]);
1726 }
1727
2/2
✓ Branch 0 taken 748 times.
✓ Branch 1 taken 18 times.
 766 if (s->channel_mode == AC3_CHMODE_STEREO)
1728 748 put_bits(pb, 1, 0); /* phase flags in use */
1729 766 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
1730 766 end_sub = (s->cpl_end_freq - 37) / 12;
1731 766 put_bits(pb, 4, start_sub);
1732 766 put_bits(pb, 4, end_sub - 3);
1733 /* coupling band structure */
1734
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 493 times.
 766 if (s->eac3) {
1735 273 put_bits(pb, 1, 0); /* use default */
1736 } else {
1737
2/2
✓ Branch 0 taken 1994 times.
✓ Branch 1 taken 493 times.
 2487 for (bnd = start_sub+1; bnd < end_sub; bnd++)
1738 1994 put_bits(pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
1739 }
1740 }
1741 }
1742
1743 /* coupling coordinates */
1744
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 3444 times.
 8040 if (block->cpl_in_use) {
1745
2/2
✓ Branch 0 taken 9516 times.
✓ Branch 1 taken 4596 times.
 14112 for (ch = 1; ch <= s->fbw_channels; ch++) {
1746
1/2
✓ Branch 0 taken 9516 times.
✗ Branch 1 not taken.
 9516 if (block->channel_in_cpl[ch]) {
1747
4/4
✓ Branch 0 taken 3276 times.
✓ Branch 1 taken 6240 times.
✓ Branch 2 taken 2730 times.
✓ Branch 3 taken 546 times.
 9516 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1748 8970 put_bits(pb, 1, block->new_cpl_coords[ch]);
1749
2/2
✓ Branch 0 taken 1634 times.
✓ Branch 1 taken 7882 times.
 9516 if (block->new_cpl_coords[ch]) {
1750 1634 put_bits(pb, 2, block->cpl_master_exp[ch]);
1751
2/2
✓ Branch 0 taken 6208 times.
✓ Branch 1 taken 1634 times.
 7842 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
1752 6208 put_bits(pb, 4, block->cpl_coord_exp [ch][bnd]);
1753 6208 put_bits(pb, 4, block->cpl_coord_mant[ch][bnd]);
1754 }
1755 }
1756 }
1757 }
1758 }
1759
1760 /* stereo rematrixing */
1761
2/2
✓ Branch 0 taken 5526 times.
✓ Branch 1 taken 2514 times.
 8040 if (s->channel_mode == AC3_CHMODE_STEREO) {
1762
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 3888 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 5526 if (!s->eac3 || blk > 0)
1763 5253 put_bits(pb, 1, block->new_rematrixing_strategy);
1764
2/2
✓ Branch 0 taken 2399 times.
✓ Branch 1 taken 3127 times.
 5526 if (block->new_rematrixing_strategy) {
1765 /* rematrixing flags */
1766
2/2
✓ Branch 0 taken 9596 times.
✓ Branch 1 taken 2399 times.
 11995 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
1767 9596 put_bits(pb, 1, block->rematrixing_flags[bnd]);
1768 }
1769 }
1770
1771 /* exponent strategy */
1772
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1773
2/2
✓ Branch 0 taken 13680 times.
✓ Branch 1 taken 6402 times.
 20082 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
1774 13680 put_bits(pb, 2, s->exp_strategy[ch][blk]);
1775
2/2
✓ Branch 0 taken 108 times.
✓ Branch 1 taken 6294 times.
 6402 if (s->lfe_on)
1776 108 put_bits(pb, 1, s->exp_strategy[s->lfe_channel][blk]);
1777 }
1778
1779 /* bandwidth */
1780
2/2
✓ Branch 0 taken 13998 times.
✓ Branch 1 taken 8040 times.
 22038 for (ch = 1; ch <= s->fbw_channels; ch++) {
1781
4/4
✓ Branch 0 taken 2631 times.
✓ Branch 1 taken 11367 times.
✓ Branch 2 taken 929 times.
✓ Branch 3 taken 1702 times.
 13998 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
1782 929 put_bits(pb, 6, s->bandwidth_code);
1783 }
1784
1785 /* exponents */
1786
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1787 int nb_groups;
1788 18702 int cpl = (ch == CPL_CH);
1789
1790
2/2
✓ Branch 0 taken 14523 times.
✓ Branch 1 taken 4179 times.
 18702 if (s->exp_strategy[ch][blk] == EXP_REUSE)
1791 14523 continue;
1792
1793 /* DC exponent */
1794 4179 put_bits(pb, 4, block->grouped_exp[ch][0] >> cpl);
1795
1796 /* exponent groups */
1797 4179 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
1798
2/2
✓ Branch 0 taken 133035 times.
✓ Branch 1 taken 4179 times.
 137214 for (i = 1; i <= nb_groups; i++)
1799 133035 put_bits(pb, 7, block->grouped_exp[ch][i]);
1800
1801 /* gain range info */
1802
4/4
✓ Branch 0 taken 4161 times.
✓ Branch 1 taken 18 times.
✓ Branch 2 taken 2631 times.
✓ Branch 3 taken 1530 times.
 4179 if (ch != s->lfe_channel && !cpl)
1803 2631 put_bits(pb, 2, 0);
1804 }
1805
1806 /* bit allocation info */
1807
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1808 6402 baie = (blk == 0);
1809 6402 put_bits(pb, 1, baie);
1810
2/2
✓ Branch 0 taken 1067 times.
✓ Branch 1 taken 5335 times.
 6402 if (baie) {
1811 1067 put_bits(pb, 2, s->slow_decay_code);
1812 1067 put_bits(pb, 2, s->fast_decay_code);
1813 1067 put_bits(pb, 2, s->slow_gain_code);
1814 1067 put_bits(pb, 2, s->db_per_bit_code);
1815 1067 put_bits(pb, 3, s->floor_code);
1816 }
1817 }
1818
1819 /* snr offset */
1820
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1821 6402 put_bits(pb, 1, block->new_snr_offsets);
1822
2/2
✓ Branch 0 taken 1067 times.
✓ Branch 1 taken 5335 times.
 6402 if (block->new_snr_offsets) {
1823 1067 put_bits(pb, 6, s->coarse_snr_offset);
1824
2/2
✓ Branch 0 taken 2298 times.
✓ Branch 1 taken 1067 times.
 3365 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1825 2298 put_bits(pb, 4, s->fine_snr_offset[ch]);
1826 2298 put_bits(pb, 3, s->fast_gain_code[ch]);
1827 }
1828 }
1829 } else {
1830 1638 put_bits(pb, 1, 0); /* no converter snr offset */
1831 }
1832
1833 /* coupling leak */
1834
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 3444 times.
 8040 if (block->cpl_in_use) {
1835
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2958 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4596 if (!s->eac3 || block->new_cpl_leak != 2)
1836 4323 put_bits(pb, 1, block->new_cpl_leak);
1837
2/2
✓ Branch 0 taken 766 times.
✓ Branch 1 taken 3830 times.
 4596 if (block->new_cpl_leak) {
1838 766 put_bits(pb, 3, s->bit_alloc.cpl_fast_leak);
1839 766 put_bits(pb, 3, s->bit_alloc.cpl_slow_leak);
1840 }
1841 }
1842
1843
2/2
✓ Branch 0 taken 6402 times.
✓ Branch 1 taken 1638 times.
 8040 if (!s->eac3) {
1844 6402 put_bits(pb, 1, 0); /* no delta bit allocation */
1845 6402 put_bits(pb, 1, 0); /* no data to skip */
1846 }
1847
1848 /* mantissas */
1849 8040 got_cpl = !block->cpl_in_use;
1850
2/2
✓ Branch 0 taken 18702 times.
✓ Branch 1 taken 8040 times.
 26742 for (ch = 1; ch <= s->channels; ch++) {
1851 int b, q;
1852
1853
5/6
✓ Branch 0 taken 9192 times.
✓ Branch 1 taken 9510 times.
✓ Branch 2 taken 4596 times.
✓ Branch 3 taken 4596 times.
✓ Branch 4 taken 4596 times.
✗ Branch 5 not taken.
 18702 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1854 4596 ch0 = ch - 1;
1855 4596 ch = CPL_CH;
1856 4596 got_cpl = 1;
1857 }
1858
2/2
✓ Branch 0 taken 2289882 times.
✓ Branch 1 taken 18702 times.
 2308584 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
1859 2289882 q = block->qmant[ch][i];
1860 2289882 b = s->ref_bap[ch][blk][i];
1861
8/8
✓ Branch 0 taken 838023 times.
✓ Branch 1 taken 630664 times.
✓ Branch 2 taken 213986 times.
✓ Branch 3 taken 229915 times.
✓ Branch 4 taken 97238 times.
✓ Branch 5 taken 19694 times.
✓ Branch 6 taken 13386 times.
✓ Branch 7 taken 246976 times.
 2289882 switch (b) {
1862 838023 case 0: break;
1863
2/2
✓ Branch 0 taken 212621 times.
✓ Branch 1 taken 418043 times.
 630664 case 1: if (q != 128) put_bits (pb, 5, q); break;
1864
2/2
✓ Branch 0 taken 73663 times.
✓ Branch 1 taken 140323 times.
 213986 case 2: if (q != 128) put_bits (pb, 7, q); break;
1865 229915 case 3: put_sbits(pb, 3, q); break;
1866
2/2
✓ Branch 0 taken 49903 times.
✓ Branch 1 taken 47335 times.
 97238 case 4: if (q != 128) put_bits (pb, 7, q); break;
1867 19694 case 14: put_sbits(pb, 14, q); break;
1868 13386 case 15: put_sbits(pb, 16, q); break;
1869 246976 default: put_sbits(pb, b-1, q); break;
1870 }
1871 }
1872
2/2
✓ Branch 0 taken 4596 times.
✓ Branch 1 taken 14106 times.
 18702 if (ch == CPL_CH)
1873 4596 ch = ch0;
1874 }
1875 8040 }
1876
1877
1878 /** CRC-16 Polynomial */
1879 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
1880
1881
1882 1469 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
1883 {
1884 unsigned int c;
1885
1886 1469 c = 0;
1887
2/2
✓ Branch 0 taken 21914 times.
✓ Branch 1 taken 1469 times.
 23383 while (a) {
1888
2/2
✓ Branch 0 taken 10745 times.
✓ Branch 1 taken 11169 times.
 21914 if (a & 1)
1889 10745 c ^= b;
1890 21914 a = a >> 1;
1891 21914 b = b << 1;
1892
2/2
✓ Branch 0 taken 10425 times.
✓ Branch 1 taken 11489 times.
 21914 if (b & (1 << 16))
1893 10425 b ^= poly;
1894 }
1895 1469 return c;
1896 }
1897
1898
1899 26 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
1900 {
1901 unsigned int r;
1902 26 r = 1;
1903
2/2
✓ Branch 0 taken 318 times.
✓ Branch 1 taken 26 times.
 344 while (n) {
1904
2/2
✓ Branch 0 taken 84 times.
✓ Branch 1 taken 234 times.
 318 if (n & 1)
1905 84 r = mul_poly(r, a, poly);
1906 318 a = mul_poly(a, a, poly);
1907 318 n >>= 1;
1908 }
1909 26 return r;
1910 }
1911
1912
1913 /*
1914 * Fill the end of the frame with 0's and compute the two CRCs.
1915 */
1916 1340 static void output_frame_end(AC3EncodeContext *s, PutBitContext *pb)
1917 {
1918 1340 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
1919 int frame_size_58, pad_bytes, crc1, crc2, crc_inv;
1920 uint8_t *frame;
1921
1922 1340 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
1923
1924 /* pad the remainder of the frame with zeros */
1925 av_assert2(s->frame_size * 8 - put_bits_count(pb) >= 18);
1926 1340 flush_put_bits(pb);
1927 1340 frame = pb->buf;
1928 1340 pad_bytes = s->frame_size - (put_bits_ptr(pb) - frame) - 2;
1929 av_assert2(pad_bytes >= 0);
1930
2/2
✓ Branch 0 taken 1181 times.
✓ Branch 1 taken 159 times.
 1340 if (pad_bytes > 0)
1931 1181 memset(put_bits_ptr(pb), 0, pad_bytes);
1932
1933
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 1067 times.
 1340 if (s->eac3) {
1934 /* compute crc2 */
1935 273 crc2 = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 4);
1936 } else {
1937 /* compute crc1 */
1938 /* this is not so easy because it is at the beginning of the data... */
1939 1067 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
1940 1067 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
1941 1067 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
1942 1067 AV_WB16(frame + 2, crc1);
1943
1944 /* compute crc2 */
1945 1067 crc2 = av_crc(crc_ctx, 0, frame + frame_size_58,
1946 1067 s->frame_size - frame_size_58 - 2);
1947 }
1948 1340 crc2 = av_bswap16(crc2);
1949 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
1950
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (crc2 == 0x0B77) {
1951 /* The CRC generator polynomial is x^16 + x^15 + x^2 + 1,
1952 * so xor'ing with 0x18005 does not affect the CRC. */
1953 ✗ frame[s->frame_size - 3] ^= 0x1;
1954 ✗ crc2 ^= 0x8005;
1955 }
1956 1340 AV_WB16(frame + s->frame_size - 2, crc2);
1957 1340 }
1958
1959
1960 /**
1961 * Write the frame to the output bitstream.
1962 *
1963 * @param s AC-3 encoder private context
1964 * @param frame output data buffer
1965 */
1966 1340 static void ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
1967 {
1968 PutBitContext pb;
1969 int blk;
1970
1971 1340 init_put_bits(&pb, frame, s->frame_size);
1972
1973 1340 s->output_frame_header(s, &pb);
1974
1975
2/2
✓ Branch 0 taken 8040 times.
✓ Branch 1 taken 1340 times.
 9380 for (blk = 0; blk < s->num_blocks; blk++)
1976 8040 output_audio_block(s, &pb, blk);
1977
1978 1340 output_frame_end(s, &pb);
1979 1340 }
1980
1981 1353 int ff_ac3_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1982 const AVFrame *frame, int *got_packet_ptr)
1983 {
1984 1353 AC3EncodeContext *const s = avctx->priv_data;
1985 int ret;
1986
1987 /* add current frame to queue */
1988
2/2
✓ Branch 0 taken 1336 times.
✓ Branch 1 taken 17 times.
 1353 if (frame) {
1989 1336 ret = ff_af_queue_add(&s->afq, frame);
1990
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1336 times.
 1336 if (ret < 0)
1991 ✗ return ret;
1992 } else {
1993
3/6
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 4 times.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
 17 if (!s->afq.remaining_samples || (!s->afq.frame_alloc && !s->afq.frame_count))
1994 13 return 0;
1995 }
1996
1997
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (s->options.allow_per_frame_metadata) {
1998 ✗ ret = ac3_validate_metadata(s);
1999 ✗ if (ret)
2000 ✗ return ret;
2001 }
2002
2003
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 1340 if (s->bit_alloc.sr_code == 1 || s->eac3)
2004 1340 ac3_adjust_frame_size(s);
2005
2006 1340 s->encode_frame(s, frame);
2007
2008 1340 ac3_apply_rematrixing(s);
2009
2010 1340 ac3_process_exponents(s);
2011
2012 1340 ret = ac3_compute_bit_allocation(s);
2013
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (ret) {
2014 ✗ av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
2015 ✗ return ret;
2016 }
2017
2018 1340 ac3_group_exponents(s);
2019
2020 1340 ac3_quantize_mantissas(s);
2021
2022 1340 ret = ff_get_encode_buffer(avctx, avpkt, s->frame_size, 0);
2023
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (ret < 0)
2024 ✗ return ret;
2025 1340 ac3_output_frame(s, avpkt->data);
2026
2027 1340 ret = ff_af_queue_remove(&s->afq, avctx->frame_size, avpkt);
2028
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1340 times.
 1340 if (ret < 0)
2029 ✗ return ret;
2030
2031 1340 *got_packet_ptr = 1;
2032 1340 return 0;
2033 }
2034
2035 13 static void dprint_options(AC3EncodeContext *s)
2036 {
2037 #ifdef DEBUG
2038 AVCodecContext *avctx = s->avctx;
2039 AC3EncOptions *opt = &s->options;
2040 const char *msg;
2041 char strbuf[32];
2042
2043 switch (s->bitstream_id) {
2044 case 6: msg = "AC-3 (alt syntax)"; break;
2045 case 8: msg = "AC-3 (standard)"; break;
2046 case 16: msg = "E-AC-3 (enhanced)"; break;
2047 default: msg = "ERROR";
2048 }
2049 ff_dlog(avctx, "bitstream_id: %s (%d)\n", msg, s->bitstream_id);
2050 ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
2051 av_channel_layout_describe(&avctx->ch_layout, strbuf, sizeof(strbuf));
2052 ff_dlog(avctx, "channel_layout: %s\n", strbuf);
2053 ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
2054 ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
2055 ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
2056 if (s->cutoff)
2057 ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
2058
2059 ff_dlog(avctx, "per_frame_metadata: %s\n",
2060 opt->allow_per_frame_metadata?"on":"off");
2061 if (s->has_center)
2062 ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
2063 s->center_mix_level);
2064 else
2065 ff_dlog(avctx, "center_mixlev: {not written}\n");
2066 if (s->has_surround)
2067 ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
2068 s->surround_mix_level);
2069 else
2070 ff_dlog(avctx, "surround_mixlev: {not written}\n");
2071 if (opt->audio_production_info) {
2072 ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
2073 switch (opt->room_type) {
2074 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2075 case AC3ENC_OPT_LARGE_ROOM: msg = "large"; break;
2076 case AC3ENC_OPT_SMALL_ROOM: msg = "small"; break;
2077 default:
2078 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->room_type);
2079 msg = strbuf;
2080 }
2081 ff_dlog(avctx, "room_type: %s\n", msg);
2082 } else {
2083 ff_dlog(avctx, "mixing_level: {not written}\n");
2084 ff_dlog(avctx, "room_type: {not written}\n");
2085 }
2086 ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
2087 ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
2088 if (s->channel_mode == AC3_CHMODE_STEREO) {
2089 switch (opt->dolby_surround_mode) {
2090 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2091 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2092 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2093 default:
2094 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_mode);
2095 msg = strbuf;
2096 }
2097 ff_dlog(avctx, "dsur_mode: %s\n", msg);
2098 } else {
2099 ff_dlog(avctx, "dsur_mode: {not written}\n");
2100 }
2101 ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
2102
2103 if (s->bitstream_id == 6) {
2104 if (opt->extended_bsi_1) {
2105 switch (opt->preferred_stereo_downmix) {
2106 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2107 case AC3ENC_OPT_DOWNMIX_LTRT: msg = "ltrt"; break;
2108 case AC3ENC_OPT_DOWNMIX_LORO: msg = "loro"; break;
2109 default:
2110 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->preferred_stereo_downmix);
2111 msg = strbuf;
2112 }
2113 ff_dlog(avctx, "dmix_mode: %s\n", msg);
2114 ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
2115 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
2116 ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
2117 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
2118 ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
2119 opt->loro_center_mix_level, s->loro_center_mix_level);
2120 ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
2121 opt->loro_surround_mix_level, s->loro_surround_mix_level);
2122 } else {
2123 ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
2124 }
2125 if (opt->extended_bsi_2) {
2126 switch (opt->dolby_surround_ex_mode) {
2127 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2128 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2129 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2130 default:
2131 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_ex_mode);
2132 msg = strbuf;
2133 }
2134 ff_dlog(avctx, "dsurex_mode: %s\n", msg);
2135 switch (opt->dolby_headphone_mode) {
2136 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2137 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2138 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2139 default:
2140 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_headphone_mode);
2141 msg = strbuf;
2142 }
2143 ff_dlog(avctx, "dheadphone_mode: %s\n", msg);
2144
2145 switch (opt->ad_converter_type) {
2146 case AC3ENC_OPT_ADCONV_STANDARD: msg = "standard"; break;
2147 case AC3ENC_OPT_ADCONV_HDCD: msg = "hdcd"; break;
2148 default:
2149 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->ad_converter_type);
2150 msg = strbuf;
2151 }
2152 ff_dlog(avctx, "ad_conv_type: %s\n", msg);
2153 } else {
2154 ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
2155 }
2156 }
2157 #endif
2158 13 }
2159
2160 /**
2161 * Finalize encoding and free any memory allocated by the encoder.
2162 *
2163 * @param avctx Codec context
2164 */
2165 13 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
2166 {
2167 13 AC3EncodeContext *s = avctx->priv_data;
2168
2169
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 13 times.
 41 for (int ch = 0; ch < s->channels; ch++)
2170 28 av_freep(&s->planar_samples[ch]);
2171 13 av_freep(&s->input_samples[0]);
2172 13 av_freep(&s->bap_buffer);
2173 13 av_freep(&s->bap1_buffer);
2174 13 av_freep(&s->mdct_coef_buffer);
2175 13 av_freep(&s->fixed_coef_buffer);
2176 13 av_freep(&s->exp_buffer);
2177 13 av_freep(&s->grouped_exp_buffer);
2178 13 av_freep(&s->psd_buffer);
2179 13 av_freep(&s->band_psd_buffer);
2180 13 av_freep(&s->mask_buffer);
2181 13 av_freep(&s->qmant_buffer);
2182 13 av_freep(&s->cpl_coord_buffer);
2183 13 av_freep(&s->fdsp);
2184
2185 13 ff_af_queue_close(&s->afq);
2186 13 av_tx_uninit(&s->tx);
2187
2188 13 return 0;
2189 }
2190
2191
2192 /*
2193 * Set channel information during initialization.
2194 */
2195 13 static av_cold void set_channel_info(AVCodecContext *avctx)
2196 {
2197 13 AC3EncodeContext *s = avctx->priv_data;
2198 13 uint64_t mask = av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0);
2199 13 int channels = avctx->ch_layout.nb_channels;
2200
2201 13 s->lfe_on = !!(mask & AV_CH_LOW_FREQUENCY);
2202 13 s->channels = channels;
2203 13 s->fbw_channels = channels - s->lfe_on;
2204
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
 13 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
2205
2206
3/8
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 5 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
✓ Branch 6 taken 2 times.
✗ Branch 7 not taken.
 13 switch (mask & ~AV_CH_LOW_FREQUENCY) {
2207 6 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
2208 5 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
2209 ✗ case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
2210 ✗ case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
2211 ✗ case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
2212 ✗ case AV_CH_LAYOUT_QUAD:
2213 ✗ case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
2214 2 case AV_CH_LAYOUT_5POINT0:
2215 2 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
2216 }
2217
4/4
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 5 times.
✓ Branch 2 taken 2 times.
✓ Branch 3 taken 6 times.
 13 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
2218 13 s->has_surround = s->channel_mode & 0x04;
2219
2220 13 s->channel_map = ac3_enc_channel_map[s->channel_mode][s->lfe_on];
2221 13 }
2222
2223
2224 13 static av_cold int validate_options(AC3EncodeContext *s)
2225 {
2226 13 AVCodecContext *avctx = s->avctx;
2227 int ret;
2228
2229 13 set_channel_info(avctx);
2230
2231 26 for (int i = 0;; i++) {
2232
2/2
✓ Branch 0 taken 13 times.
✓ Branch 1 taken 13 times.
 26 if (ff_ac3_sample_rate_tab[i] == avctx->sample_rate) {
2233 13 s->bit_alloc.sr_code = i;
2234 13 break;
2235 }
2236 av_assert1(ff_ac3_sample_rate_tab[i] != 0);
2237 }
2238 13 s->sample_rate = avctx->sample_rate;
2239
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
 13 s->bitstream_id = s->eac3 ? 16 : 8;
2240
2241 /* select a default bit rate if not set by the user */
2242
2/2
✓ Branch 0 taken 5 times.
✓ Branch 1 taken 8 times.
 13 if (!avctx->bit_rate) {
2243
1/6
✓ Branch 0 taken 5 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
 5 switch (s->fbw_channels) {
2244 5 case 1: avctx->bit_rate = 96000; break;
2245 ✗ case 2: avctx->bit_rate = 192000; break;
2246 ✗ case 3: avctx->bit_rate = 320000; break;
2247 ✗ case 4: avctx->bit_rate = 384000; break;
2248 ✗ case 5: avctx->bit_rate = 448000; break;
2249 }
2250 }
2251
2252 /* validate bit rate */
2253
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 12 times.
 13 if (s->eac3) {
2254 int max_br, min_br, wpf, min_br_code;
2255 int num_blks_code, num_blocks, frame_samples;
2256 long long min_br_dist;
2257
2258 /* calculate min/max bitrate */
2259 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
2260 found use either 6 blocks or 1 block, even though 2 or 3 blocks
2261 would work as far as the bit rate is concerned. */
2262
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
2263 1 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
2264 1 frame_samples = AC3_BLOCK_SIZE * num_blocks;
2265 1 max_br = 2048 * s->sample_rate / frame_samples * 16;
2266 1 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
2267
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (avctx->bit_rate <= max_br)
2268 1 break;
2269 }
2270
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
2271 ✗ av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
2272 "for this sample rate\n", min_br, max_br);
2273 ✗ return AVERROR(EINVAL);
2274 }
2275 1 s->num_blks_code = num_blks_code;
2276 1 s->num_blocks = num_blocks;
2277
2278 /* calculate words-per-frame for the selected bitrate */
2279 1 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
2280 av_assert1(wpf > 0 && wpf <= 2048);
2281
2282 /* find the closest AC-3 bitrate code to the selected bitrate.
2283 this is needed for lookup tables for bandwidth and coupling
2284 parameter selection */
2285 1 min_br_code = -1;
2286 1 min_br_dist = INT64_MAX;
2287
2/2
✓ Branch 0 taken 19 times.
✓ Branch 1 taken 1 times.
 20 for (int i = 0; i < 19; i++) {
2288 19 long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
2289
2/2
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 10 times.
 19 if (br_dist < min_br_dist) {
2290 9 min_br_dist = br_dist;
2291 9 min_br_code = i;
2292 }
2293 }
2294
2295 /* make sure the minimum frame size is below the average frame size */
2296 1 s->frame_size_code = min_br_code << 1;
2297
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
2298 ✗ wpf--;
2299 1 s->frame_size_min = 2 * wpf;
2300 } else {
2301 12 int best_br = 0, best_code = 0;
2302 12 long long best_diff = INT64_MAX;
2303
1/2
✓ Branch 0 taken 106 times.
✗ Branch 1 not taken.
 106 for (int i = 0; i < 19; i++) {
2304 106 int br = ff_ac3_bitrate_tab[i] * 1000;
2305 106 long long diff = llabs(br - avctx->bit_rate);
2306
1/2
✓ Branch 0 taken 106 times.
✗ Branch 1 not taken.
 106 if (diff < best_diff) {
2307 106 best_br = br;
2308 106 best_code = i;
2309 106 best_diff = diff;
2310 }
2311
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 94 times.
 106 if (!best_diff)
2312 12 break;
2313 }
2314 12 avctx->bit_rate = best_br;
2315 12 s->frame_size_code = best_code << 1;
2316 12 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
2317 12 s->num_blks_code = 0x3;
2318 12 s->num_blocks = 6;
2319 }
2320 13 s->bit_rate = avctx->bit_rate;
2321 13 s->frame_size = s->frame_size_min;
2322
2323 /* validate cutoff */
2324
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (avctx->cutoff < 0) {
2325 ✗ av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
2326 ✗ return AVERROR(EINVAL);
2327 }
2328 13 s->cutoff = avctx->cutoff;
2329
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (s->cutoff > (s->sample_rate >> 1))
2330 ✗ s->cutoff = s->sample_rate >> 1;
2331
2332 13 ret = ac3_validate_metadata(s);
2333
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (ret)
2334 ✗ return ret;
2335
2336
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 1 times.
 25 s->rematrixing_enabled = s->options.stereo_rematrixing &&
2337
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 8 times.
 12 (s->channel_mode == AC3_CHMODE_STEREO);
2338
2339
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 1 times.
 25 s->cpl_enabled = s->options.channel_coupling &&
2340
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 6 times.
 12 s->channel_mode >= AC3_CHMODE_STEREO;
2341
2342 13 return 0;
2343 }
2344
2345
2346 /*
2347 * Set bandwidth for all channels.
2348 * The user can optionally supply a cutoff frequency. Otherwise an appropriate
2349 * default value will be used.
2350 */
2351 13 static av_cold void set_bandwidth(AC3EncodeContext *s)
2352 {
2353 13 int blk, ch, av_uninit(cpl_start);
2354
2355
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (s->cutoff) {
2356 /* calculate bandwidth based on user-specified cutoff frequency */
2357 int fbw_coeffs;
2358 ✗ fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
2359 ✗ s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
2360 } else {
2361 /* use default bandwidth setting */
2362 13 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
2363 }
2364
2365 /* set number of coefficients for each channel */
2366
2/2
✓ Branch 0 taken 26 times.
✓ Branch 1 taken 13 times.
 39 for (ch = 1; ch <= s->fbw_channels; ch++) {
2367 26 s->start_freq[ch] = 0;
2368
2/2
✓ Branch 0 taken 156 times.
✓ Branch 1 taken 26 times.
 182 for (blk = 0; blk < s->num_blocks; blk++)
2369 156 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
2370 }
2371 /* LFE channel always has 7 coefs */
2372
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
 13 if (s->lfe_on) {
2373 2 s->start_freq[s->lfe_channel] = 0;
2374
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 2 times.
 14 for (blk = 0; blk < s->num_blocks; blk++)
2375 12 s->blocks[blk].end_freq[ch] = 7;
2376 }
2377
2378 /* initialize coupling strategy */
2379
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 7 times.
 13 if (s->cpl_enabled) {
2380
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6 times.
 6 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
2381 ✗ cpl_start = s->options.cpl_start;
2382 } else {
2383 6 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
2384
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6 times.
 6 if (cpl_start < 0) {
2385 ✗ if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
2386 ✗ s->cpl_enabled = 0;
2387 else
2388 ✗ cpl_start = 15;
2389 }
2390 }
2391 }
2392
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 7 times.
 13 if (s->cpl_enabled) {
2393 int i, cpl_start_band, cpl_end_band;
2394 6 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
2395
2396 6 cpl_end_band = s->bandwidth_code / 4 + 3;
2397 6 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
2398
2399 6 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
2400
2401 6 s->num_cpl_bands = 1;
2402 6 *cpl_band_sizes = 12;
2403
2/2
✓ Branch 0 taken 22 times.
✓ Branch 1 taken 6 times.
 28 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
2404
2/2
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 12 times.
 22 if (ff_eac3_default_cpl_band_struct[i]) {
2405 10 *cpl_band_sizes += 12;
2406 } else {
2407 12 s->num_cpl_bands++;
2408 12 cpl_band_sizes++;
2409 12 *cpl_band_sizes = 12;
2410 }
2411 }
2412
2413 6 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
2414 6 s->cpl_end_freq = cpl_end_band * 12 + 37;
2415
2/2
✓ Branch 0 taken 36 times.
✓ Branch 1 taken 6 times.
 42 for (blk = 0; blk < s->num_blocks; blk++)
2416 36 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
2417 }
2418 13 }
2419
2420
2421 13 static av_cold int allocate_buffers(AC3EncodeContext *s)
2422 {
2423 int blk, ch;
2424 13 int channels = s->channels + 1; /* includes coupling channel */
2425 13 int channel_blocks = channels * s->num_blocks;
2426 13 int total_coefs = AC3_MAX_COEFS * channel_blocks;
2427 uint8_t *cpl_coord_mant_buffer;
2428 13 const unsigned sampletype_size = SAMPLETYPE_SIZE(s);
2429
2430
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 13 times.
 41 for (int ch = 0; ch < s->channels; ch++) {
2431 28 s->planar_samples[ch] = av_mallocz(AC3_BLOCK_SIZE * sampletype_size);
2432
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 28 times.
 28 if (!s->planar_samples[ch])
2433 ✗ return AVERROR(ENOMEM);
2434 }
2435 13 int ret = av_samples_alloc(s->input_samples, NULL, s->channels,
2436 13 AC3_BLOCK_SIZE * s->num_blocks,
2437 13 s->avctx->sample_fmt, 0);
2438
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (ret < 0)
2439 ✗ return ret;
2440
2441
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 if (!FF_ALLOC_TYPED_ARRAY(s->bap_buffer, total_coefs) ||
2442
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->bap1_buffer, total_coefs) ||
2443
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOCZ_TYPED_ARRAY(s->mdct_coef_buffer, total_coefs) ||
2444
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->exp_buffer, total_coefs) ||
2445
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->grouped_exp_buffer, channel_blocks * 128) ||
2446
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->psd_buffer, total_coefs) ||
2447
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->band_psd_buffer, channel_blocks * 64) ||
2448
1/2
✓ Branch 1 taken 13 times.
✗ Branch 2 not taken.
 13 !FF_ALLOC_TYPED_ARRAY(s->mask_buffer, channel_blocks * 64) ||
2449
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 13 times.
 13 !FF_ALLOC_TYPED_ARRAY(s->qmant_buffer, total_coefs))
2450 ✗ return AVERROR(ENOMEM);
2451
2452
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 11 times.
 13 if (!s->fixed_point) {
2453
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 2 times.
 2 if (!FF_ALLOCZ_TYPED_ARRAY(s->fixed_coef_buffer, total_coefs))
2454 ✗ return AVERROR(ENOMEM);
2455 }
2456
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 7 times.
 13 if (s->cpl_enabled) {
2457
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 6 times.
 6 if (!FF_ALLOC_TYPED_ARRAY(s->cpl_coord_buffer, channel_blocks * 32))
2458 ✗ return AVERROR(ENOMEM);
2459 6 cpl_coord_mant_buffer = s->cpl_coord_buffer + 16 * channel_blocks;
2460 }
2461
2/2
✓ Branch 0 taken 78 times.
✓ Branch 1 taken 13 times.
 91 for (blk = 0; blk < s->num_blocks; blk++) {
2462 78 AC3Block *block = &s->blocks[blk];
2463
2464
2/2
✓ Branch 0 taken 246 times.
✓ Branch 1 taken 78 times.
 324 for (ch = 0; ch < channels; ch++) {
2465 /* arrangement: block, channel, coeff */
2466 246 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
2467 246 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2468 246 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
2469 246 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
2470 246 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2471
2/2
✓ Branch 0 taken 156 times.
✓ Branch 1 taken 90 times.
 246 if (s->cpl_enabled) {
2472 156 block->cpl_coord_exp[ch] = &s->cpl_coord_buffer [16 * (blk * channels + ch)];
2473 156 block->cpl_coord_mant[ch] = &cpl_coord_mant_buffer[16 * (blk * channels + ch)];
2474 }
2475
2476 /* arrangement: channel, block, coeff */
2477 246 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2478 246 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2479
2/2
✓ Branch 0 taken 210 times.
✓ Branch 1 taken 36 times.
 246 if (s->fixed_point)
2480 210 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
2481 else
2482 36 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2483 }
2484 }
2485
2486 13 return 0;
2487 }
2488
2489
2490 13 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
2491 {
2492 static AVOnce init_static_once = AV_ONCE_INIT;
2493 13 AC3EncodeContext *s = avctx->priv_data;
2494 int ret, frame_size_58;
2495
2496 13 s->avctx = avctx;
2497
2498 13 ret = validate_options(s);
2499
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (ret)
2500 ✗ return ret;
2501
2502 13 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
2503 13 avctx->initial_padding = AC3_BLOCK_SIZE;
2504
2505 13 s->bitstream_mode = avctx->audio_service_type;
2506
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
2507 ✗ s->bitstream_mode = 0x7;
2508
2509 13 s->bits_written = 0;
2510 13 s->samples_written = 0;
2511
2512 /* calculate crc_inv for both possible frame sizes */
2513 13 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
2514 13 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2515
1/2
✓ Branch 0 taken 13 times.
✗ Branch 1 not taken.
 13 if (s->bit_alloc.sr_code == 1) {
2516 13 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
2517 13 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2518 }
2519
2520
2/2
✓ Branch 0 taken 12 times.
✓ Branch 1 taken 1 times.
 13 if (!s->output_frame_header)
2521 12 s->output_frame_header = ac3_output_frame_header;
2522
2523 13 set_bandwidth(s);
2524
2525 13 bit_alloc_init(s);
2526
2527 13 ret = allocate_buffers(s);
2528
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13 times.
 13 if (ret)
2529 ✗ return ret;
2530
2531 13 ff_audiodsp_init(&s->adsp);
2532 13 ff_me_cmp_init(&s->mecc, avctx);
2533 13 ff_ac3dsp_init(&s->ac3dsp);
2534
2535 13 dprint_options(s);
2536
2537 13 ff_af_queue_init(avctx, &s->afq);
2538
2539 13 ff_thread_once(&init_static_once, exponent_init);
2540
2541 13 return 0;
2542 }
2543