FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc.c
Date: 2025-06-23 20:06:14
Exec Total Coverage
Lines: 994 1142 87.0%
Functions: 43 43 100.0%
Branches: 626 811 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/emms.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/mem.h"
38 #include "libavutil/mem_internal.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/thread.h"
41 #include "avcodec.h"
42 #include "codec_internal.h"
43 #include "config_components.h"
44 #include "encode.h"
45 #include "me_cmp.h"
46 #include "put_bits.h"
47 #include "audiodsp.h"
48 #include "ac3dsp.h"
49 #include "ac3.h"
50 #include "ac3defs.h"
51 #include "ac3tab.h"
52 #include "ac3enc.h"
53 #include "eac3enc.h"
54
55 #define SAMPLETYPE_SIZE(ctx) (sizeof(float) == sizeof(int32_t) ? sizeof(float) : \
56 (ctx)->fixed_point ? sizeof(int32_t) : sizeof(float))
57
58 typedef struct AC3Mant {
59 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
60 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
61 } AC3Mant;
62
63 #define CMIXLEV_NUM_OPTIONS 3
64 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
65 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
66 };
67
68 #define SURMIXLEV_NUM_OPTIONS 3
69 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
70 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
71 };
72
73 #define EXTMIXLEV_NUM_OPTIONS 8
74 #define extmixlev_options ff_ac3_gain_levels
75
76 /* The first two options apply only to the AC-3 encoders;
77 * the rest is also valid for EAC-3. When modifying it,
78 * it might be necessary to adapt said offset in eac3enc.c. */
79 #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
80 #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
81 const AVOption ff_ac3_enc_options[] = {
82 /* AC-3 downmix levels */
83 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
84 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
85 /* audio production information */
86 {"mixing_level", "Mixing Level", OFFSET(mixing_level), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 111, AC3ENC_PARAM},
87 {"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"},
88 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
89 {"large", "Large Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_LARGE_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
90 {"small", "Small Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_SMALL_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
91 /* Metadata Options */
92 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AC3ENC_PARAM},
93 {"copyright", "Copyright Bit", OFFSET(copyright), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
94 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), AV_OPT_TYPE_INT, {.i64 = -31 }, -31, -1, AC3ENC_PARAM},
95 {"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"},
96 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
97 {"on", "Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
98 {"off", "Not Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
99 {"original", "Original Bit Stream", OFFSET(original), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
100 /* extended bitstream information */
101 {"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"},
102 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
103 {"ltrt", "Lt/Rt Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LTRT }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
104 {"loro", "Lo/Ro Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LORO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
105 {"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"},
106 {"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},
107 {"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},
108 {"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},
109 {"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},
110 {"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"},
111 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
112 {"on", "Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
113 {"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"},
114 {"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"},
115 {"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"},
116 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
117 {"on", "Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
118 {"off", "Not Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
119 {"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"},
120 {"standard", "Standard (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_STANDARD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
121 {"hdcd", "HDCD", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
122 /* Other Encoding Options */
123 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, AC3ENC_PARAM},
124 {"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"},
125 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "channel_coupling"},
126 {"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"},
127 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "cpl_start_band"},
128 {NULL}
129 };
130
131 const AVClass ff_ac3enc_class = {
132 .class_name = "AC-3 Encoder",
133 .item_name = av_default_item_name,
134 .option = ff_ac3_enc_options,
135 .version = LIBAVUTIL_VERSION_INT,
136 };
137
138 const FFCodecDefault ff_ac3_enc_defaults[] = {
139 { "b", "0" },
140 { NULL }
141 };
142
143 /**
144 * LUT for number of exponent groups.
145 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
146 */
147 static uint8_t exponent_group_tab[2][3][256];
148
149
150 /**
151 * List of supported channel layouts.
152 */
153 const AVChannelLayout ff_ac3_ch_layouts[19] = {
154 AV_CHANNEL_LAYOUT_MONO,
155 AV_CHANNEL_LAYOUT_STEREO,
156 AV_CHANNEL_LAYOUT_2_1,
157 AV_CHANNEL_LAYOUT_SURROUND,
158 AV_CHANNEL_LAYOUT_2_2,
159 AV_CHANNEL_LAYOUT_QUAD,
160 AV_CHANNEL_LAYOUT_4POINT0,
161 AV_CHANNEL_LAYOUT_5POINT0,
162 AV_CHANNEL_LAYOUT_5POINT0_BACK,
163 {
164 .nb_channels = 2,
165 .order = AV_CHANNEL_ORDER_NATIVE,
166 .u.mask = AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY,
167 },
168 {
169 .nb_channels = 3,
170 .order = AV_CHANNEL_ORDER_NATIVE,
171 .u.mask = AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY,
172 },
173 {
174 .nb_channels = 4,
175 .order = AV_CHANNEL_ORDER_NATIVE,
176 .u.mask = AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY,
177 },
178 {
179 .nb_channels = 4,
180 .order = AV_CHANNEL_ORDER_NATIVE,
181 .u.mask = AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY,
182 },
183 {
184 .nb_channels = 5,
185 .order = AV_CHANNEL_ORDER_NATIVE,
186 .u.mask = AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY,
187 },
188 AV_CHANNEL_LAYOUT_5POINT1,
189 AV_CHANNEL_LAYOUT_5POINT1_BACK,
190 { 0 },
191 };
192
193 /**
194 * Table to remap channels from SMPTE order to AC-3 order.
195 * [channel_mode][lfe][ch]
196 */
197 static const uint8_t ac3_enc_channel_map[8][2][6] = {
198 COMMON_CHANNEL_MAP
199 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
200 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
201 };
202
203 /**
204 * LUT to select the bandwidth code based on the bit rate, sample rate, and
205 * number of full-bandwidth channels.
206 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
207 */
208 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
209 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
210
211 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
212 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
213 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
214
215 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
216 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
217 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
218
219 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
220 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
221 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
222
223 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
224 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
225 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
226
227 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
228 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
229 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
230 };
231
232
233 /**
234 * LUT to select the coupling start band based on the bit rate, sample rate, and
235 * number of full-bandwidth channels. -1 = coupling off
236 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
237 *
238 * TODO: more testing for optimal parameters.
239 * multi-channel tests at 44.1kHz and 32kHz.
240 */
241 static const int8_t ac3_coupling_start_tab[6][3][19] = {
242 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
243
244 // 2/0
245 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
246 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
247 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
248
249 // 3/0
250 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
251 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
252 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
253
254 // 2/1 - untested
255 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
256 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
257 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
258
259 // 3/1
260 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
261 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
262 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
263
264 // 2/2 - untested
265 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
266 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
267 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
268
269 // 3/2
270 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
271 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
272 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
273 };
274
275
276 #define FLT_OPTION_THRESHOLD 0.01
277
278 2 static int validate_float_option(float v, const float *v_list, int v_list_size)
279 {
280 int i;
281
282
1/2
✓ Branch 0 taken 4 times.
✗ Branch 1 not taken.
 4 for (i = 0; i < v_list_size; i++) {
283
1/2
✓ Branch 0 taken 4 times.
✗ Branch 1 not taken.
 4 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
284
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 2 times.
 4 v > (v_list[i] - FLT_OPTION_THRESHOLD))
285 2 break;
286 }
287
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (i == v_list_size)
288 ✗ return AVERROR(EINVAL);
289
290 2 return i;
291 }
292
293
294 2 static void validate_mix_level(void *log_ctx, const char *opt_name,
295 float *opt_param, const float *list,
296 int list_size, int default_value, int min_value,
297 int *ctx_param)
298 {
299 2 int mixlev = validate_float_option(*opt_param, list, list_size);
300
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (mixlev < min_value) {
301 ✗ mixlev = default_value;
302 ✗ if (*opt_param >= 0.0) {
303 ✗ av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
304 ✗ "default value: %0.3f\n", opt_name, list[mixlev]);
305 }
306 }
307 2 *opt_param = list[mixlev];
308 2 *ctx_param = mixlev;
309 2 }
310
311
312 /**
313 * Validate metadata options as set by AVOption system.
314 * These values can optionally be changed per-frame.
315 *
316 * @param s AC-3 encoder private context
317 */
318 11 static int ac3_validate_metadata(AC3EncodeContext *s)
319 {
320 11 AVCodecContext *avctx = s->avctx;
321 11 AC3EncOptions *opt = &s->options;
322
323 11 opt->audio_production_info = 0;
324 11 opt->extended_bsi_1 = 0;
325 11 opt->extended_bsi_2 = 0;
326 11 opt->eac3_mixing_metadata = 0;
327 11 opt->eac3_info_metadata = 0;
328
329 /* determine mixing metadata / xbsi1 use */
330
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 11 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
331 ✗ opt->extended_bsi_1 = 1;
332 ✗ opt->eac3_mixing_metadata = 1;
333 }
334
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->has_center &&
335
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
336 ✗ opt->extended_bsi_1 = 1;
337 ✗ opt->eac3_mixing_metadata = 1;
338 }
339
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->has_surround &&
340
2/4
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 1 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
341 ✗ opt->extended_bsi_1 = 1;
342 ✗ opt->eac3_mixing_metadata = 1;
343 }
344
345
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->eac3) {
346 /* determine info metadata use */
347
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
348 ✗ opt->eac3_info_metadata = 1;
349
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)
350 ✗ opt->eac3_info_metadata = 1;
351
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->channel_mode == AC3_CHMODE_STEREO &&
352
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))
353 ✗ opt->eac3_info_metadata = 1;
354
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)
355 ✗ opt->eac3_info_metadata = 1;
356
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 ||
357
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 opt->ad_converter_type != AC3ENC_OPT_NONE) {
358 ✗ opt->audio_production_info = 1;
359 ✗ opt->eac3_info_metadata = 1;
360 }
361 } else {
362 /* determine audio production info use */
363
2/4
✓ Branch 0 taken 10 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 10 times.
 10 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
364 ✗ opt->audio_production_info = 1;
365
366 /* determine xbsi2 use */
367
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 9 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 10 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
368 ✗ opt->extended_bsi_2 = 1;
369
3/4
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 8 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 10 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
370 ✗ opt->extended_bsi_2 = 1;
371
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 10 times.
 10 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
372 ✗ opt->extended_bsi_2 = 1;
373 }
374
375 /* validate AC-3 mixing levels */
376
2/2
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 1 times.
 11 if (!s->eac3) {
377
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 9 times.
 10 if (s->has_center) {
378 1 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
379 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
380 &s->center_mix_level);
381 }
382
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 9 times.
 10 if (s->has_surround) {
383 1 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
384 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
385 &s->surround_mix_level);
386 }
387 }
388
389 /* validate extended bsi 1 / mixing metadata */
390
2/4
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 11 times.
 11 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
391 /* default preferred stereo downmix */
392 ✗ if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
393 ✗ opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
394 ✗ if (!s->eac3 || s->has_center) {
395 /* validate Lt/Rt center mix level */
396 ✗ validate_mix_level(avctx, "ltrt_center_mix_level",
397 &opt->ltrt_center_mix_level, extmixlev_options,
398 EXTMIXLEV_NUM_OPTIONS, 5, 0,
399 &s->ltrt_center_mix_level);
400 /* validate Lo/Ro center mix level */
401 ✗ validate_mix_level(avctx, "loro_center_mix_level",
402 &opt->loro_center_mix_level, extmixlev_options,
403 EXTMIXLEV_NUM_OPTIONS, 5, 0,
404 &s->loro_center_mix_level);
405 }
406 ✗ if (!s->eac3 || s->has_surround) {
407 /* validate Lt/Rt surround mix level */
408 ✗ validate_mix_level(avctx, "ltrt_surround_mix_level",
409 &opt->ltrt_surround_mix_level, extmixlev_options,
410 EXTMIXLEV_NUM_OPTIONS, 6, 3,
411 &s->ltrt_surround_mix_level);
412 /* validate Lo/Ro surround mix level */
413 ✗ validate_mix_level(avctx, "loro_surround_mix_level",
414 &opt->loro_surround_mix_level, extmixlev_options,
415 EXTMIXLEV_NUM_OPTIONS, 6, 3,
416 &s->loro_surround_mix_level);
417 }
418 }
419
420 /* validate audio service type / channels combination */
421
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
422 ✗ avctx->ch_layout.nb_channels == 1) ||
423
1/2
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
 11 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
424
1/2
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
 11 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
425
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
426 ✗ && avctx->ch_layout.nb_channels > 1)) {
427 ✗ av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
428 "specified number of channels\n");
429 ✗ return AVERROR(EINVAL);
430 }
431
432 /* validate extended bsi 2 / info metadata */
433
2/4
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 11 times.
 11 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
434 /* default dolby headphone mode */
435 ✗ if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
436 ✗ opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
437 /* default dolby surround ex mode */
438 ✗ if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
439 ✗ opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
440 /* default A/D converter type */
441 ✗ if (opt->ad_converter_type == AC3ENC_OPT_NONE)
442 ✗ opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
443 }
444
445 /* copyright & original defaults */
446
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 11 if (!s->eac3 || opt->eac3_info_metadata) {
447 /* default copyright */
448
1/2
✓ Branch 0 taken 10 times.
✗ Branch 1 not taken.
 10 if (opt->copyright == AC3ENC_OPT_NONE)
449 10 opt->copyright = AC3ENC_OPT_OFF;
450 /* default original */
451
1/2
✓ Branch 0 taken 10 times.
✗ Branch 1 not taken.
 10 if (opt->original == AC3ENC_OPT_NONE)
452 10 opt->original = AC3ENC_OPT_ON;
453 }
454
455 /* dolby surround mode default */
456
3/4
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1 times.
 11 if (!s->eac3 || opt->eac3_info_metadata) {
457
1/2
✓ Branch 0 taken 10 times.
✗ Branch 1 not taken.
 10 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
458 10 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
459 }
460
461 /* validate audio production info */
462
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (opt->audio_production_info) {
463 ✗ if (opt->mixing_level == AC3ENC_OPT_NONE) {
464 ✗ av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
465 "room_type is set\n");
466 ✗ return AVERROR(EINVAL);
467 }
468 ✗ if (opt->mixing_level < 80) {
469 ✗ av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
470 "80dB and 111dB\n");
471 ✗ return AVERROR(EINVAL);
472 }
473 /* default room type */
474 ✗ if (opt->room_type == AC3ENC_OPT_NONE)
475 ✗ opt->room_type = AC3ENC_OPT_NOT_INDICATED;
476 }
477
478 /* set bitstream id for alternate bitstream syntax */
479
4/6
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 1 times.
✓ Branch 2 taken 10 times.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✓ Branch 5 taken 10 times.
 11 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2))
480 ✗ s->bitstream_id = 6;
481
482 11 return 0;
483 }
484
485 /**
486 * Adjust the frame size to make the average bit rate match the target bit rate.
487 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
488 *
489 * @param s AC-3 encoder private context
490 */
491 1251 static void ac3_adjust_frame_size(AC3EncodeContext *s)
492 {
493
3/4
✓ Branch 0 taken 36 times.
✓ Branch 1 taken 1251 times.
✓ Branch 2 taken 36 times.
✗ Branch 3 not taken.
 1287 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
494 36 s->bits_written -= s->bit_rate;
495 36 s->samples_written -= s->sample_rate;
496 }
497 2502 s->frame_size = s->frame_size_min +
498
2/2
✓ Branch 0 taken 950 times.
✓ Branch 1 taken 301 times.
 1251 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
499 1251 s->bits_written += s->frame_size * 8;
500 1251 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
501 1251 }
502
503 /**
504 * Set the initial coupling strategy parameters prior to coupling analysis.
505 *
506 * @param s AC-3 encoder private context
507 */
508 1251 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
509 {
510 int blk, ch;
511 int got_cpl_snr;
512 int num_cpl_blocks;
513
514 /* set coupling use flags for each block/channel */
515 /* TODO: turn coupling on/off and adjust start band based on bit usage */
516
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
517 7506 AC3Block *block = &s->blocks[blk];
518
2/2
✓ Branch 0 taken 12012 times.
✓ Branch 1 taken 7506 times.
 19518 for (ch = 1; ch <= s->fbw_channels; ch++)
519 12012 block->channel_in_cpl[ch] = s->cpl_on;
520 }
521
522 /* enable coupling for each block if at least 2 channels have coupling
523 enabled for that block */
524 1251 got_cpl_snr = 0;
525 1251 num_cpl_blocks = 0;
526
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
527 7506 AC3Block *block = &s->blocks[blk];
528 7506 block->num_cpl_channels = 0;
529
2/2
✓ Branch 0 taken 12012 times.
✓ Branch 1 taken 7506 times.
 19518 for (ch = 1; ch <= s->fbw_channels; ch++)
530 12012 block->num_cpl_channels += block->channel_in_cpl[ch];
531 7506 block->cpl_in_use = block->num_cpl_channels > 1;
532 7506 num_cpl_blocks += block->cpl_in_use;
533
2/2
✓ Branch 0 taken 3144 times.
✓ Branch 1 taken 4362 times.
 7506 if (!block->cpl_in_use) {
534 3144 block->num_cpl_channels = 0;
535
2/2
✓ Branch 0 taken 3144 times.
✓ Branch 1 taken 3144 times.
 6288 for (ch = 1; ch <= s->fbw_channels; ch++)
536 3144 block->channel_in_cpl[ch] = 0;
537 }
538
539 7506 block->new_cpl_strategy = !blk;
540
2/2
✓ Branch 0 taken 6255 times.
✓ Branch 1 taken 1251 times.
 7506 if (blk) {
541
2/2
✓ Branch 0 taken 10010 times.
✓ Branch 1 taken 6255 times.
 16265 for (ch = 1; ch <= s->fbw_channels; ch++) {
542
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 10010 times.
 10010 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
543 ✗ block->new_cpl_strategy = 1;
544 ✗ break;
545 }
546 }
547 }
548 7506 block->new_cpl_leak = block->new_cpl_strategy;
549
550
5/6
✓ Branch 0 taken 6255 times.
✓ Branch 1 taken 1251 times.
✓ Branch 2 taken 3635 times.
✓ Branch 3 taken 2620 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 3635 times.
 7506 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
551 1251 block->new_snr_offsets = 1;
552
2/2
✓ Branch 0 taken 727 times.
✓ Branch 1 taken 524 times.
 1251 if (block->cpl_in_use)
553 727 got_cpl_snr = 1;
554 } else {
555 6255 block->new_snr_offsets = 0;
556 }
557 }
558
2/2
✓ Branch 0 taken 524 times.
✓ Branch 1 taken 727 times.
 1251 if (!num_cpl_blocks)
559 524 s->cpl_on = 0;
560
561 /* set bandwidth for each channel */
562
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
563 7506 AC3Block *block = &s->blocks[blk];
564
2/2
✓ Branch 0 taken 12012 times.
✓ Branch 1 taken 7506 times.
 19518 for (ch = 1; ch <= s->fbw_channels; ch++) {
565
2/2
✓ Branch 0 taken 8868 times.
✓ Branch 1 taken 3144 times.
 12012 if (block->channel_in_cpl[ch])
566 8868 block->end_freq[ch] = s->start_freq[CPL_CH];
567 else
568 3144 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
569 }
570 }
571 1251 }
572
573
574 /**
575 * Apply stereo rematrixing to coefficients based on rematrixing flags.
576 *
577 * @param s AC-3 encoder private context
578 */
579 1251 static void ac3_apply_rematrixing(AC3EncodeContext *s)
580 {
581 int nb_coefs;
582 int blk, bnd, i;
583 int start, end;
584 1251 uint8_t *flags = NULL;
585
586
2/2
✓ Branch 0 taken 532 times.
✓ Branch 1 taken 719 times.
 1251 if (!s->rematrixing_enabled)
587 532 return;
588
589
2/2
✓ Branch 0 taken 4314 times.
✓ Branch 1 taken 719 times.
 5033 for (blk = 0; blk < s->num_blocks; blk++) {
590 4314 AC3Block *block = &s->blocks[blk];
591
2/2
✓ Branch 0 taken 2197 times.
✓ Branch 1 taken 2117 times.
 4314 if (block->new_rematrixing_strategy)
592 2197 flags = block->rematrixing_flags;
593 4314 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
594
2/2
✓ Branch 0 taken 17256 times.
✓ Branch 1 taken 4314 times.
 21570 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
595
2/2
✓ Branch 0 taken 9547 times.
✓ Branch 1 taken 7709 times.
 17256 if (flags[bnd]) {
596 9547 start = ff_ac3_rematrix_band_tab[bnd];
597 9547 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
598
2/2
✓ Branch 0 taken 215736 times.
✓ Branch 1 taken 9547 times.
 225283 for (i = start; i < end; i++) {
599 215736 int32_t lt = block->fixed_coef[1][i];
600 215736 int32_t rt = block->fixed_coef[2][i];
601 215736 block->fixed_coef[1][i] = (lt + rt) >> 1;
602 215736 block->fixed_coef[2][i] = (lt - rt) >> 1;
603 }
604 }
605 }
606 }
607 }
608
609
610 /*
611 * Initialize exponent tables.
612 */
613 11 static av_cold void exponent_init(void)
614 {
615 int expstr, i, grpsize;
616
617
2/2
✓ Branch 0 taken 33 times.
✓ Branch 1 taken 11 times.
 44 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
618 33 grpsize = 3 << expstr;
619
2/2
✓ Branch 0 taken 8052 times.
✓ Branch 1 taken 33 times.
 8085 for (i = 12; i < 256; i++) {
620 8052 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
621 8052 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
622 }
623 }
624 /* LFE */
625 11 exponent_group_tab[0][0][7] = 2;
626 11 }
627
628
629 /*
630 * Extract exponents from the MDCT coefficients.
631 */
632 1251 static void extract_exponents(AC3EncodeContext *s)
633 {
634 1251 int ch = !s->cpl_on;
635 1251 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
636 1251 AC3Block *block = &s->blocks[0];
637
638 1251 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
639 1251 }
640
641
642 /**
643 * Exponent Difference Threshold.
644 * New exponents are sent if their SAD exceed this number.
645 */
646 #define EXP_DIFF_THRESHOLD 500
647
648 /**
649 * Table used to select exponent strategy based on exponent reuse block interval.
650 */
651 static const uint8_t exp_strategy_reuse_tab[4][6] = {
652 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
653 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
654 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
655 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
656 };
657
658 /*
659 * Calculate exponent strategies for all channels.
660 * Array arrangement is reversed to simplify the per-channel calculation.
661 */
662 1251 static void compute_exp_strategy(AC3EncodeContext *s)
663 {
664 int ch, blk, blk1;
665
666
2/2
✓ Branch 0 taken 2729 times.
✓ Branch 1 taken 1251 times.
 3980 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
667 2729 uint8_t *exp_strategy = s->exp_strategy[ch];
668 2729 uint8_t *exp = s->blocks[0].exp[ch];
669 int exp_diff;
670
671 /* estimate if the exponent variation & decide if they should be
672 reused in the next frame */
673 2729 exp_strategy[0] = EXP_NEW;
674 2729 exp += AC3_MAX_COEFS;
675
2/2
✓ Branch 0 taken 13645 times.
✓ Branch 1 taken 2729 times.
 16374 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
676
2/2
✓ Branch 0 taken 3635 times.
✓ Branch 1 taken 10010 times.
 13645 if (ch == CPL_CH) {
677
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3635 times.
 3635 if (!s->blocks[blk-1].cpl_in_use) {
678 ✗ exp_strategy[blk] = EXP_NEW;
679 ✗ continue;
680
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3635 times.
 3635 } else if (!s->blocks[blk].cpl_in_use) {
681 ✗ exp_strategy[blk] = EXP_REUSE;
682 ✗ continue;
683 }
684
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 10010 times.
 10010 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
685 ✗ exp_strategy[blk] = EXP_NEW;
686 ✗ continue;
687 }
688 13645 exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
689 13645 exp_strategy[blk] = EXP_REUSE;
690
4/4
✓ Branch 0 taken 3635 times.
✓ Branch 1 taken 10010 times.
✓ Branch 2 taken 723 times.
✓ Branch 3 taken 2912 times.
 13645 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
691 723 exp_strategy[blk] = EXP_NEW;
692
4/4
✓ Branch 0 taken 10010 times.
✓ Branch 1 taken 2912 times.
✓ Branch 2 taken 318 times.
✓ Branch 3 taken 9692 times.
 12922 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
693 318 exp_strategy[blk] = EXP_NEW;
694 }
695
696 /* now select the encoding strategy type : if exponents are often
697 recoded, we use a coarse encoding */
698 2729 blk = 0;
699
2/2
✓ Branch 0 taken 3770 times.
✓ Branch 1 taken 2729 times.
 6499 while (blk < s->num_blocks) {
700 3770 blk1 = blk + 1;
701
4/4
✓ Branch 0 taken 13645 times.
✓ Branch 1 taken 2729 times.
✓ Branch 2 taken 12604 times.
✓ Branch 3 taken 1041 times.
 16374 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
702 12604 blk1++;
703 3770 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
704 3770 blk = blk1;
705 }
706 }
707
2/2
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 1243 times.
 1251 if (s->lfe_on) {
708 8 ch = s->lfe_channel;
709 8 s->exp_strategy[ch][0] = EXP_D15;
710
2/2
✓ Branch 0 taken 40 times.
✓ Branch 1 taken 8 times.
 48 for (blk = 1; blk < s->num_blocks; blk++)
711 40 s->exp_strategy[ch][blk] = EXP_REUSE;
712 }
713
714 /* for E-AC-3, determine frame exponent strategy */
715
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 978 times.
 1251 if (CONFIG_EAC3_ENCODER && s->eac3)
716 273 ff_eac3_get_frame_exp_strategy(s);
717 1251 }
718
719
720 /**
721 * Update the exponents so that they are the ones the decoder will decode.
722 *
723 * @param[in,out] exp array of exponents for 1 block in 1 channel
724 * @param nb_exps number of exponents in active bandwidth
725 * @param exp_strategy exponent strategy for the block
726 * @param cpl indicates if the block is in the coupling channel
727 */
728 3778 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
729 int cpl)
730 {
731 int nb_groups, i, k;
732
733 3778 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
734
735 /* for each group, compute the minimum exponent */
736
3/3
✓ Branch 0 taken 575 times.
✓ Branch 1 taken 735 times.
✓ Branch 2 taken 2468 times.
 3778 switch(exp_strategy) {
737 575 case EXP_D25:
738
2/2
✓ Branch 0 taken 29166 times.
✓ Branch 1 taken 575 times.
 29741 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
739 29166 uint8_t exp_min = exp[k];
740
2/2
✓ Branch 0 taken 9362 times.
✓ Branch 1 taken 19804 times.
 29166 if (exp[k+1] < exp_min)
741 9362 exp_min = exp[k+1];
742 29166 exp[i-cpl] = exp_min;
743 29166 k += 2;
744 }
745 575 break;
746 735 case EXP_D45:
747
2/2
✓ Branch 0 taken 18573 times.
✓ Branch 1 taken 735 times.
 19308 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
748 18573 uint8_t exp_min = exp[k];
749
2/2
✓ Branch 0 taken 7049 times.
✓ Branch 1 taken 11524 times.
 18573 if (exp[k+1] < exp_min)
750 7049 exp_min = exp[k+1];
751
2/2
✓ Branch 0 taken 3258 times.
✓ Branch 1 taken 15315 times.
 18573 if (exp[k+2] < exp_min)
752 3258 exp_min = exp[k+2];
753
2/2
✓ Branch 0 taken 2155 times.
✓ Branch 1 taken 16418 times.
 18573 if (exp[k+3] < exp_min)
754 2155 exp_min = exp[k+3];
755 18573 exp[i-cpl] = exp_min;
756 18573 k += 4;
757 }
758 735 break;
759 }
760
761 /* constraint for DC exponent */
762
4/4
✓ Branch 0 taken 2328 times.
✓ Branch 1 taken 1450 times.
✓ Branch 2 taken 883 times.
✓ Branch 3 taken 1445 times.
 3778 if (!cpl && exp[0] > 15)
763 883 exp[0] = 15;
764
765 /* decrease the delta between each groups to within 2 so that they can be
766 differentially encoded */
767
2/2
✓ Branch 0 taken 328239 times.
✓ Branch 1 taken 3778 times.
 332017 for (i = 1; i <= nb_groups; i++)
768 328239 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
769 3778 i--;
770
2/2
✓ Branch 0 taken 328239 times.
✓ Branch 1 taken 3778 times.
 332017 while (--i >= 0)
771 328239 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
772
773
2/2
✓ Branch 0 taken 1450 times.
✓ Branch 1 taken 2328 times.
 3778 if (cpl)
774 1450 exp[-1] = exp[0] & ~1;
775
776 /* now we have the exponent values the decoder will see */
777
3/3
✓ Branch 0 taken 575 times.
✓ Branch 1 taken 735 times.
✓ Branch 2 taken 2468 times.
 3778 switch (exp_strategy) {
778 575 case EXP_D25:
779
2/2
✓ Branch 0 taken 29166 times.
✓ Branch 1 taken 575 times.
 29741 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
780 29166 uint8_t exp1 = exp[i-cpl];
781 29166 exp[k--] = exp1;
782 29166 exp[k--] = exp1;
783 }
784 575 break;
785 735 case EXP_D45:
786
2/2
✓ Branch 0 taken 18573 times.
✓ Branch 1 taken 735 times.
 19308 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
787 18573 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
788 18573 k -= 4;
789 }
790 735 break;
791 }
792 3778 }
793
794
795 /*
796 * Encode exponents from original extracted form to what the decoder will see.
797 * This copies and groups exponents based on exponent strategy and reduces
798 * deltas between adjacent exponent groups so that they can be differentially
799 * encoded.
800 */
801 1251 static void encode_exponents(AC3EncodeContext *s)
802 {
803 int blk, blk1, ch, cpl;
804 uint8_t *exp, *exp_strategy;
805 int nb_coefs, num_reuse_blocks;
806
807
2/2
✓ Branch 0 taken 2737 times.
✓ Branch 1 taken 1251 times.
 3988 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
808 2737 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
809 2737 exp_strategy = s->exp_strategy[ch];
810
811 2737 cpl = (ch == CPL_CH);
812 2737 blk = 0;
813
2/2
✓ Branch 0 taken 3778 times.
✓ Branch 1 taken 2737 times.
 6515 while (blk < s->num_blocks) {
814 3778 AC3Block *block = &s->blocks[blk];
815
3/4
✓ Branch 0 taken 1450 times.
✓ Branch 1 taken 2328 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 1450 times.
 3778 if (cpl && !block->cpl_in_use) {
816 ✗ exp += AC3_MAX_COEFS;
817 ✗ blk++;
818 ✗ continue;
819 }
820 3778 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
821 3778 blk1 = blk + 1;
822
823 /* count the number of EXP_REUSE blocks after the current block
824 and set exponent reference block numbers */
825 3778 s->exp_ref_block[ch][blk] = blk;
826
4/4
✓ Branch 0 taken 13685 times.
✓ Branch 1 taken 2737 times.
✓ Branch 2 taken 12644 times.
✓ Branch 3 taken 1041 times.
 16422 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
827 12644 s->exp_ref_block[ch][blk1] = blk;
828 12644 blk1++;
829 }
830 3778 num_reuse_blocks = blk1 - blk - 1;
831
832 /* for the EXP_REUSE case we select the min of the exponents */
833 3778 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
834 AC3_MAX_COEFS);
835
836 3778 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
837
838 3778 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
839 3778 blk = blk1;
840 }
841 }
842
843 /* reference block numbers have been changed, so reset ref_bap_set */
844 1251 s->ref_bap_set = 0;
845 1251 }
846
847
848 /*
849 * Count exponent bits based on bandwidth, coupling, and exponent strategies.
850 */
851 1251 static int count_exponent_bits(AC3EncodeContext *s)
852 {
853 int blk, ch;
854 int nb_groups, bit_count;
855
856 1251 bit_count = 0;
857
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
858 7506 AC3Block *block = &s->blocks[blk];
859
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
860 16422 int exp_strategy = s->exp_strategy[ch][blk];
861 16422 int cpl = (ch == CPL_CH);
862 16422 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
863
864
2/2
✓ Branch 0 taken 12644 times.
✓ Branch 1 taken 3778 times.
 16422 if (exp_strategy == EXP_REUSE)
865 12644 continue;
866
867 3778 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
868 3778 bit_count += 4 + (nb_groups * 7);
869 }
870 }
871
872 1251 return bit_count;
873 }
874
875
876 /**
877 * Group exponents.
878 * 3 delta-encoded exponents are in each 7-bit group. The number of groups
879 * varies depending on exponent strategy and bandwidth.
880 *
881 * @param s AC-3 encoder private context
882 */
883 1251 static void ac3_group_exponents(AC3EncodeContext *s)
884 {
885 int blk, ch, i, cpl;
886 int group_size, nb_groups;
887 uint8_t *p;
888 int delta0, delta1, delta2;
889 int exp0, exp1;
890
891
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
892 7506 AC3Block *block = &s->blocks[blk];
893
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
894 16422 int exp_strategy = s->exp_strategy[ch][blk];
895
2/2
✓ Branch 0 taken 12644 times.
✓ Branch 1 taken 3778 times.
 16422 if (exp_strategy == EXP_REUSE)
896 12644 continue;
897 3778 cpl = (ch == CPL_CH);
898 3778 group_size = exp_strategy + (exp_strategy == EXP_D45);
899 3778 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
900 3778 p = block->exp[ch] + s->start_freq[ch] - cpl;
901
902 /* DC exponent */
903 3778 exp1 = *p++;
904 3778 block->grouped_exp[ch][0] = exp1;
905
906 /* remaining exponents are delta encoded */
907
2/2
✓ Branch 0 taken 109413 times.
✓ Branch 1 taken 3778 times.
 113191 for (i = 1; i <= nb_groups; i++) {
908 /* merge three delta in one code */
909 109413 exp0 = exp1;
910 109413 exp1 = p[0];
911 109413 p += group_size;
912 109413 delta0 = exp1 - exp0 + 2;
913 av_assert2(delta0 >= 0 && delta0 <= 4);
914
915 109413 exp0 = exp1;
916 109413 exp1 = p[0];
917 109413 p += group_size;
918 109413 delta1 = exp1 - exp0 + 2;
919 av_assert2(delta1 >= 0 && delta1 <= 4);
920
921 109413 exp0 = exp1;
922 109413 exp1 = p[0];
923 109413 p += group_size;
924 109413 delta2 = exp1 - exp0 + 2;
925 av_assert2(delta2 >= 0 && delta2 <= 4);
926
927 109413 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
928 }
929 }
930 }
931 1251 }
932
933
934 /**
935 * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
936 * Extract exponents from MDCT coefficients, calculate exponent strategies,
937 * and encode final exponents.
938 *
939 * @param s AC-3 encoder private context
940 */
941 1251 static void ac3_process_exponents(AC3EncodeContext *s)
942 {
943 1251 extract_exponents(s);
944
945 1251 compute_exp_strategy(s);
946
947 1251 encode_exponents(s);
948
949 1251 emms_c();
950 1251 }
951
952
953 /*
954 * Count frame bits that are based solely on fixed parameters.
955 * This only has to be run once when the encoder is initialized.
956 */
957 11 static void count_frame_bits_fixed(AC3EncodeContext *s)
958 {
959 static const uint8_t frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
960 int blk;
961 int frame_bits;
962
963 /* assumptions:
964 * no dynamic range codes
965 * bit allocation parameters do not change between blocks
966 * no delta bit allocation
967 * no skipped data
968 * no auxiliary data
969 * no E-AC-3 metadata
970 */
971
972 /* header */
973 11 frame_bits = 16; /* sync info */
974
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->eac3) {
975 /* bitstream info header */
976 1 frame_bits += 35;
977 1 frame_bits += 1 + 1;
978
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->num_blocks != 0x6)
979 ✗ frame_bits++;
980 1 frame_bits++;
981 /* audio frame header */
982
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->num_blocks == 6)
983 1 frame_bits += 2;
984 1 frame_bits += 10;
985 /* exponent strategy */
986
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->use_frame_exp_strategy)
987 ✗ frame_bits += 5 * s->fbw_channels;
988 else
989 1 frame_bits += s->num_blocks * 2 * s->fbw_channels;
990
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->lfe_on)
991 ✗ frame_bits += s->num_blocks;
992 /* converter exponent strategy */
993
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
 1 if (s->num_blks_code != 0x3)
994 ✗ frame_bits++;
995 else
996 1 frame_bits += s->fbw_channels * 5;
997 /* snr offsets */
998 1 frame_bits += 10;
999 /* block start info */
1000
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (s->num_blocks != 1)
1001 1 frame_bits++;
1002 } else {
1003 10 frame_bits += 49;
1004 10 frame_bits += frame_bits_inc[s->channel_mode];
1005 }
1006
1007 /* audio blocks */
1008
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 11 times.
 77 for (blk = 0; blk < s->num_blocks; blk++) {
1009
2/2
✓ Branch 0 taken 60 times.
✓ Branch 1 taken 6 times.
 66 if (!s->eac3) {
1010 /* block switch flags */
1011 60 frame_bits += s->fbw_channels;
1012
1013 /* dither flags */
1014 60 frame_bits += s->fbw_channels;
1015 }
1016
1017 /* dynamic range */
1018 66 frame_bits++;
1019
1020 /* spectral extension */
1021
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 60 times.
 66 if (s->eac3)
1022 6 frame_bits++;
1023
1024 /* coupling strategy exists: cplstre */
1025
2/2
✓ Branch 0 taken 60 times.
✓ Branch 1 taken 6 times.
 66 if (!s->eac3)
1026 60 frame_bits++;
1027
1028
2/2
✓ Branch 0 taken 60 times.
✓ Branch 1 taken 6 times.
 66 if (!s->eac3) {
1029 /* exponent strategy */
1030 60 frame_bits += 2 * s->fbw_channels;
1031
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 54 times.
 60 if (s->lfe_on)
1032 6 frame_bits++;
1033
1034 /* bit allocation params */
1035 60 frame_bits++;
1036
2/2
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 50 times.
 60 if (!blk)
1037 10 frame_bits += 2 + 2 + 2 + 2 + 3;
1038 }
1039
1040 /* snroffste for AC-3, convsnroffste for E-AC-3 */
1041 66 frame_bits++;
1042
1043
2/2
✓ Branch 0 taken 60 times.
✓ Branch 1 taken 6 times.
 66 if (!s->eac3) {
1044 /* delta bit allocation */
1045 60 frame_bits++;
1046
1047 /* skipped data */
1048 60 frame_bits++;
1049 }
1050 }
1051
1052 /* auxiliary data */
1053 11 frame_bits++;
1054
1055 /* CRC */
1056 11 frame_bits += 1 + 16;
1057
1058 11 s->frame_bits_fixed = frame_bits;
1059 11 }
1060
1061
1062 /*
1063 * Initialize bit allocation.
1064 * Set default parameter codes and calculate parameter values.
1065 */
1066 11 static av_cold void bit_alloc_init(AC3EncodeContext *s)
1067 {
1068 int ch;
1069
1070 /* init default parameters */
1071 11 s->slow_decay_code = 2;
1072 11 s->fast_decay_code = 1;
1073 11 s->slow_gain_code = 1;
1074
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 s->db_per_bit_code = s->eac3 ? 2 : 3;
1075 11 s->floor_code = 7;
1076
2/2
✓ Branch 0 taken 30 times.
✓ Branch 1 taken 11 times.
 41 for (ch = 0; ch <= s->channels; ch++)
1077 30 s->fast_gain_code[ch] = 4;
1078
1079 /* initial snr offset */
1080 11 s->coarse_snr_offset = 40;
1081
1082 /* compute real values */
1083 /* currently none of these values change during encoding, so we can just
1084 set them once at initialization */
1085 11 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code];
1086 11 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code];
1087 11 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
1088 11 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
1089 11 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
1090 11 s->bit_alloc.cpl_fast_leak = 0;
1091 11 s->bit_alloc.cpl_slow_leak = 0;
1092
1093 11 count_frame_bits_fixed(s);
1094 11 }
1095
1096
1097 /*
1098 * Count the bits used to encode the frame, minus exponents and mantissas.
1099 * Bits based on fixed parameters have already been counted, so now we just
1100 * have to add the bits based on parameters that change during encoding.
1101 */
1102 1251 static void count_frame_bits(AC3EncodeContext *s)
1103 {
1104 1251 AC3EncOptions *opt = &s->options;
1105 int blk, ch;
1106 1251 int frame_bits = 0;
1107
1108 /* header */
1109
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 978 times.
 1251 if (s->eac3) {
1110
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 273 times.
 273 if (opt->eac3_mixing_metadata) {
1111 ✗ if (s->channel_mode > AC3_CHMODE_STEREO)
1112 ✗ frame_bits += 2;
1113 ✗ if (s->has_center)
1114 ✗ frame_bits += 6;
1115 ✗ if (s->has_surround)
1116 ✗ frame_bits += 6;
1117 ✗ frame_bits += s->lfe_on;
1118 ✗ frame_bits += 1 + 1 + 2;
1119 ✗ if (s->channel_mode < AC3_CHMODE_STEREO)
1120 ✗ frame_bits++;
1121 ✗ frame_bits++;
1122 }
1123
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 273 times.
 273 if (opt->eac3_info_metadata) {
1124 ✗ frame_bits += 3 + 1 + 1;
1125 ✗ if (s->channel_mode == AC3_CHMODE_STEREO)
1126 ✗ frame_bits += 2 + 2;
1127 ✗ if (s->channel_mode >= AC3_CHMODE_2F2R)
1128 ✗ frame_bits += 2;
1129 ✗ frame_bits++;
1130 ✗ if (opt->audio_production_info)
1131 ✗ frame_bits += 5 + 2 + 1;
1132 ✗ frame_bits++;
1133 }
1134 /* coupling */
1135
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->channel_mode > AC3_CHMODE_MONO) {
1136 273 frame_bits++;
1137
2/2
✓ Branch 0 taken 1365 times.
✓ Branch 1 taken 273 times.
 1638 for (blk = 1; blk < s->num_blocks; blk++) {
1138 1365 AC3Block *block = &s->blocks[blk];
1139 1365 frame_bits++;
1140
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1365 times.
 1365 if (block->new_cpl_strategy)
1141 ✗ frame_bits++;
1142 }
1143 }
1144 /* coupling exponent strategy */
1145
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->cpl_on) {
1146
1/2
✓ Branch 0 taken 273 times.
✗ Branch 1 not taken.
 273 if (s->use_frame_exp_strategy) {
1147 273 frame_bits += 5;
1148 } else {
1149 ✗ for (blk = 0; blk < s->num_blocks; blk++)
1150 ✗ frame_bits += 2 * s->blocks[blk].cpl_in_use;
1151 }
1152 }
1153 } else {
1154
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 978 times.
 978 if (opt->audio_production_info)
1155 ✗ frame_bits += 7;
1156
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 978 times.
 978 if (s->bitstream_id == 6) {
1157 ✗ if (opt->extended_bsi_1)
1158 ✗ frame_bits += 14;
1159 ✗ if (opt->extended_bsi_2)
1160 ✗ frame_bits += 14;
1161 }
1162 }
1163
1164 /* audio blocks */
1165
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
1166 7506 AC3Block *block = &s->blocks[blk];
1167
1168 /* coupling strategy */
1169
2/2
✓ Branch 0 taken 1251 times.
✓ Branch 1 taken 6255 times.
 7506 if (block->new_cpl_strategy) {
1170
2/2
✓ Branch 0 taken 978 times.
✓ Branch 1 taken 273 times.
 1251 if (!s->eac3)
1171 978 frame_bits++;
1172
2/2
✓ Branch 0 taken 727 times.
✓ Branch 1 taken 524 times.
 1251 if (block->cpl_in_use) {
1173
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
 727 if (s->eac3)
1174 273 frame_bits++;
1175
3/4
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 273 times.
 727 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
1176 454 frame_bits += s->fbw_channels;
1177
2/2
✓ Branch 0 taken 719 times.
✓ Branch 1 taken 8 times.
 727 if (s->channel_mode == AC3_CHMODE_STEREO)
1178 719 frame_bits++;
1179 727 frame_bits += 4 + 4;
1180
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
 727 if (s->eac3)
1181 273 frame_bits++;
1182 else
1183 454 frame_bits += s->num_cpl_subbands - 1;
1184 }
1185 }
1186
1187 /* coupling coordinates */
1188
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 3144 times.
 7506 if (block->cpl_in_use) {
1189
2/2
✓ Branch 0 taken 8868 times.
✓ Branch 1 taken 4362 times.
 13230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1190
1/2
✓ Branch 0 taken 8868 times.
✗ Branch 1 not taken.
 8868 if (block->channel_in_cpl[ch]) {
1191
4/4
✓ Branch 0 taken 3276 times.
✓ Branch 1 taken 5592 times.
✓ Branch 2 taken 2730 times.
✓ Branch 3 taken 546 times.
 8868 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1192 8322 frame_bits++;
1193
2/2
✓ Branch 0 taken 1513 times.
✓ Branch 1 taken 7355 times.
 8868 if (block->new_cpl_coords[ch]) {
1194 1513 frame_bits += 2;
1195 1513 frame_bits += (4 + 4) * s->num_cpl_bands;
1196 }
1197 }
1198 }
1199 }
1200
1201 /* stereo rematrixing */
1202
2/2
✓ Branch 0 taken 4314 times.
✓ Branch 1 taken 3192 times.
 7506 if (s->channel_mode == AC3_CHMODE_STEREO) {
1203
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2676 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4314 if (!s->eac3 || blk > 0)
1204 4041 frame_bits++;
1205
2/2
✓ Branch 0 taken 2197 times.
✓ Branch 1 taken 2117 times.
 4314 if (s->blocks[blk].new_rematrixing_strategy)
1206 2197 frame_bits += block->num_rematrixing_bands;
1207 }
1208
1209 /* bandwidth codes & gain range */
1210
2/2
✓ Branch 0 taken 12012 times.
✓ Branch 1 taken 7506 times.
 19518 for (ch = 1; ch <= s->fbw_channels; ch++) {
1211
2/2
✓ Branch 0 taken 2320 times.
✓ Branch 1 taken 9692 times.
 12012 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1212
2/2
✓ Branch 0 taken 746 times.
✓ Branch 1 taken 1574 times.
 2320 if (!block->channel_in_cpl[ch])
1213 746 frame_bits += 6;
1214 2320 frame_bits += 2;
1215 }
1216 }
1217
1218 /* coupling exponent strategy */
1219
4/4
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
✓ Branch 2 taken 2724 times.
✓ Branch 3 taken 3144 times.
 7506 if (!s->eac3 && block->cpl_in_use)
1220 2724 frame_bits += 2;
1221
1222 /* snr offsets and fast gain codes */
1223
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1224
2/2
✓ Branch 0 taken 978 times.
✓ Branch 1 taken 4890 times.
 5868 if (block->new_snr_offsets)
1225 978 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
1226 }
1227
1228 /* coupling leak info */
1229
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 3144 times.
 7506 if (block->cpl_in_use) {
1230
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2724 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4362 if (!s->eac3 || block->new_cpl_leak != 2)
1231 4089 frame_bits++;
1232
2/2
✓ Branch 0 taken 727 times.
✓ Branch 1 taken 3635 times.
 4362 if (block->new_cpl_leak)
1233 727 frame_bits += 3 + 3;
1234 }
1235 }
1236
1237 1251 s->frame_bits = s->frame_bits_fixed + frame_bits;
1238 1251 }
1239
1240
1241 /*
1242 * Calculate masking curve based on the final exponents.
1243 * Also calculate the power spectral densities to use in future calculations.
1244 */
1245 1251 static void bit_alloc_masking(AC3EncodeContext *s)
1246 {
1247 int blk, ch;
1248
1249
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
1250 7506 AC3Block *block = &s->blocks[blk];
1251
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1252 /* We only need psd and mask for calculating bap.
1253 Since we currently do not calculate bap when exponent
1254 strategy is EXP_REUSE we do not need to calculate psd or mask. */
1255
2/2
✓ Branch 0 taken 3778 times.
✓ Branch 1 taken 12644 times.
 16422 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1256 3778 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
1257 block->end_freq[ch], block->psd[ch],
1258 block->band_psd[ch]);
1259 3778 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
1260 s->start_freq[ch], block->end_freq[ch],
1261 3778 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
1262 3778 ch == s->lfe_channel,
1263 DBA_NONE, 0, NULL, NULL, NULL,
1264 block->mask[ch]);
1265 }
1266 }
1267 }
1268 1251 }
1269
1270
1271 /*
1272 * Ensure that bap for each block and channel point to the current bap_buffer.
1273 * They may have been switched during the bit allocation search.
1274 */
1275 11904 static void reset_block_bap(AC3EncodeContext *s)
1276 {
1277 int blk, ch;
1278 uint8_t *ref_bap;
1279
1280
4/4
✓ Branch 0 taken 5277 times.
✓ Branch 1 taken 6627 times.
✓ Branch 2 taken 4037 times.
✓ Branch 3 taken 1240 times.
 11904 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
1281 4037 return;
1282
1283 7867 ref_bap = s->bap_buffer;
1284
2/2
✓ Branch 0 taken 20439 times.
✓ Branch 1 taken 7867 times.
 28306 for (ch = 0; ch <= s->channels; ch++) {
1285
2/2
✓ Branch 0 taken 122634 times.
✓ Branch 1 taken 20439 times.
 143073 for (blk = 0; blk < s->num_blocks; blk++)
1286 122634 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
1287 20439 ref_bap += AC3_MAX_COEFS * s->num_blocks;
1288 }
1289 7867 s->ref_bap_set = 1;
1290 }
1291
1292
1293 /**
1294 * Initialize mantissa counts.
1295 * These are set so that they are padded to the next whole group size when bits
1296 * are counted in compute_mantissa_size.
1297 *
1298 * @param[in,out] mant_cnt running counts for each bap value for each block
1299 */
1300 10653 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
1301 {
1302 int blk;
1303
1304
2/2
✓ Branch 0 taken 63918 times.
✓ Branch 1 taken 10653 times.
 74571 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
1305 63918 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
1306 63918 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
1307 63918 mant_cnt[blk][4] = 1;
1308 }
1309 10653 }
1310
1311
1312 /**
1313 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
1314 * range.
1315 *
1316 * @param s AC-3 encoder private context
1317 * @param ch channel index
1318 * @param[in,out] mant_cnt running counts for each bap value for each block
1319 * @param start starting coefficient bin
1320 * @param end ending coefficient bin
1321 */
1322 23153 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
1323 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
1324 int start, int end)
1325 {
1326 int blk;
1327
1328
2/2
✓ Branch 0 taken 138918 times.
✓ Branch 1 taken 23153 times.
 162071 for (blk = 0; blk < s->num_blocks; blk++) {
1329 138918 AC3Block *block = &s->blocks[blk];
1330
3/4
✓ Branch 0 taken 36684 times.
✓ Branch 1 taken 102234 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 36684 times.
 138918 if (ch == CPL_CH && !block->cpl_in_use)
1331 ✗ continue;
1332 138918 s->ac3dsp.update_bap_counts(mant_cnt[blk],
1333 138918 s->ref_bap[ch][blk] + start,
1334 138918 FFMIN(end, block->end_freq[ch]) - start);
1335 }
1336 23153 }
1337
1338
1339 /*
1340 * Count the number of mantissa bits in the frame based on the bap values.
1341 */
1342 10653 static int count_mantissa_bits(AC3EncodeContext *s)
1343 {
1344 int ch, max_end_freq;
1345 10653 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
1346
1347 10653 count_mantissa_bits_init(mant_cnt);
1348
1349 10653 max_end_freq = s->bandwidth_code * 3 + 73;
1350
2/2
✓ Branch 0 taken 23153 times.
✓ Branch 1 taken 10653 times.
 33806 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
1351 23153 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
1352 max_end_freq);
1353
1354 10653 return s->ac3dsp.compute_mantissa_size(mant_cnt);
1355 }
1356
1357
1358 /**
1359 * Run the bit allocation with a given SNR offset.
1360 * This calculates the bit allocation pointers that will be used to determine
1361 * the quantization of each mantissa.
1362 *
1363 * @param s AC-3 encoder private context
1364 * @param snr_offset SNR offset, 0 to 1023
1365 * @return the number of bits needed for mantissas if the given SNR offset is
1366 * is used.
1367 */
1368 10653 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
1369 {
1370 int blk, ch;
1371
1372 10653 snr_offset = (snr_offset - 240) * 4;
1373
1374 10653 reset_block_bap(s);
1375
2/2
✓ Branch 0 taken 63918 times.
✓ Branch 1 taken 10653 times.
 74571 for (blk = 0; blk < s->num_blocks; blk++) {
1376 63918 AC3Block *block = &s->blocks[blk];
1377
1378
2/2
✓ Branch 0 taken 138918 times.
✓ Branch 1 taken 63918 times.
 202836 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1379 /* Currently the only bit allocation parameters which vary across
1380 blocks within a frame are the exponent values. We can take
1381 advantage of that by reusing the bit allocation pointers
1382 whenever we reuse exponents. */
1383
2/2
✓ Branch 0 taken 32287 times.
✓ Branch 1 taken 106631 times.
 138918 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1384 32287 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
1385 s->start_freq[ch], block->end_freq[ch],
1386 snr_offset, s->bit_alloc.floor,
1387 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
1388 }
1389 }
1390 }
1391 10653 return count_mantissa_bits(s);
1392 }
1393
1394
1395 /*
1396 * Constant bitrate bit allocation search.
1397 * Find the largest SNR offset that will allow data to fit in the frame.
1398 */
1399 1251 static int cbr_bit_allocation(AC3EncodeContext *s)
1400 {
1401 int ch;
1402 int bits_left;
1403 int snr_offset, snr_incr;
1404
1405 1251 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
1406
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (bits_left < 0)
1407 ✗ return AVERROR(EINVAL);
1408
1409 1251 snr_offset = s->coarse_snr_offset << 4;
1410
1411 /* if previous frame SNR offset was 1023, check if current frame can also
1412 use SNR offset of 1023. if so, skip the search. */
1413
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
1414 ✗ if (bit_alloc(s, 1023) <= bits_left)
1415 ✗ return 0;
1416 }
1417
1418
3/4
✓ Branch 0 taken 1535 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 284 times.
✓ Branch 3 taken 1251 times.
 3070 while (snr_offset >= 0 &&
1419 1535 bit_alloc(s, snr_offset) > bits_left) {
1420 284 snr_offset -= 64;
1421 }
1422
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (snr_offset < 0)
1423 ✗ return AVERROR(EINVAL);
1424
1425 1251 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1426
2/2
✓ Branch 0 taken 5004 times.
✓ Branch 1 taken 1251 times.
 6255 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
1427
3/4
✓ Branch 0 taken 9118 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 4114 times.
✓ Branch 3 taken 5004 times.
 18236 while (snr_offset + snr_incr <= 1023 &&
1428 9118 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
1429 4114 snr_offset += snr_incr;
1430 4114 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1431 }
1432 }
1433 1251 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1434 1251 reset_block_bap(s);
1435
1436 1251 s->coarse_snr_offset = snr_offset >> 4;
1437
2/2
✓ Branch 0 taken 2737 times.
✓ Branch 1 taken 1251 times.
 3988 for (ch = !s->cpl_on; ch <= s->channels; ch++)
1438 2737 s->fine_snr_offset[ch] = snr_offset & 0xF;
1439
1440 1251 return 0;
1441 }
1442
1443
1444 /*
1445 * Perform bit allocation search.
1446 * Finds the SNR offset value that maximizes quality and fits in the specified
1447 * frame size. Output is the SNR offset and a set of bit allocation pointers
1448 * used to quantize the mantissas.
1449 */
1450 1251 static int ac3_compute_bit_allocation(AC3EncodeContext *s)
1451 {
1452 1251 count_frame_bits(s);
1453
1454 1251 s->exponent_bits = count_exponent_bits(s);
1455
1456 1251 bit_alloc_masking(s);
1457
1458 1251 return cbr_bit_allocation(s);
1459 }
1460
1461
1462 /**
1463 * Symmetric quantization on 'levels' levels.
1464 *
1465 * @param c unquantized coefficient
1466 * @param e exponent
1467 * @param levels number of quantization levels
1468 * @return quantized coefficient
1469 */
1470 1072138 static inline int sym_quant(int c, int e, int levels)
1471 {
1472 1072138 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
1473 av_assert2(v >= 0 && v < levels);
1474 1072138 return v;
1475 }
1476
1477
1478 /**
1479 * Asymmetric quantization on 2^qbits levels.
1480 *
1481 * @param c unquantized coefficient
1482 * @param e exponent
1483 * @param qbits number of quantization bits
1484 * @return quantized coefficient
1485 */
1486 159049 static inline int asym_quant(int c, int e, int qbits)
1487 {
1488 int m;
1489
1490 159049 c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
1491 159049 m = (1 << (qbits-1));
1492
2/2
✓ Branch 0 taken 166 times.
✓ Branch 1 taken 158883 times.
 159049 if (c >= m)
1493 166 c = m - 1;
1494 av_assert2(c >= -m);
1495 159049 return c;
1496 }
1497
1498
1499 /**
1500 * Quantize a set of mantissas for a single channel in a single block.
1501 *
1502 * @param s Mantissa count context
1503 * @param fixed_coef unquantized fixed-point coefficients
1504 * @param exp exponents
1505 * @param bap bit allocation pointer indices
1506 * @param[out] qmant quantized coefficients
1507 * @param start_freq starting coefficient bin
1508 * @param end_freq ending coefficient bin
1509 */
1510 16422 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
1511 uint8_t *exp, uint8_t *bap,
1512 int16_t *qmant, int start_freq,
1513 int end_freq)
1514 {
1515 int i;
1516
1517
2/2
✓ Branch 0 taken 1862892 times.
✓ Branch 1 taken 16422 times.
 1879314 for (i = start_freq; i < end_freq; i++) {
1518 1862892 int c = fixed_coef[i];
1519 1862892 int e = exp[i];
1520 1862892 int v = bap[i];
1521
9/9
✓ Branch 0 taken 631705 times.
✓ Branch 1 taken 515343 times.
✓ Branch 2 taken 198317 times.
✓ Branch 3 taken 203339 times.
✓ Branch 4 taken 89430 times.
✓ Branch 5 taken 65709 times.
✓ Branch 6 taken 13306 times.
✓ Branch 7 taken 7452 times.
✓ Branch 8 taken 138291 times.
 1862892 switch (v) {
1522 631705 case 0:
1523 631705 break;
1524 515343 case 1:
1525 515343 v = sym_quant(c, e, 3);
1526
3/3
✓ Branch 0 taken 174069 times.
✓ Branch 1 taken 171938 times.
✓ Branch 2 taken 169336 times.
 515343 switch (s->mant1_cnt) {
1527 174069 case 0:
1528 174069 s->qmant1_ptr = &qmant[i];
1529 174069 v = 9 * v;
1530 174069 s->mant1_cnt = 1;
1531 174069 break;
1532 171938 case 1:
1533 171938 *s->qmant1_ptr += 3 * v;
1534 171938 s->mant1_cnt = 2;
1535 171938 v = 128;
1536 171938 break;
1537 169336 default:
1538 169336 *s->qmant1_ptr += v;
1539 169336 s->mant1_cnt = 0;
1540 169336 v = 128;
1541 169336 break;
1542 }
1543 515343 break;
1544 198317 case 2:
1545 198317 v = sym_quant(c, e, 5);
1546
3/3
✓ Branch 0 taken 68333 times.
✓ Branch 1 taken 66123 times.
✓ Branch 2 taken 63861 times.
 198317 switch (s->mant2_cnt) {
1547 68333 case 0:
1548 68333 s->qmant2_ptr = &qmant[i];
1549 68333 v = 25 * v;
1550 68333 s->mant2_cnt = 1;
1551 68333 break;
1552 66123 case 1:
1553 66123 *s->qmant2_ptr += 5 * v;
1554 66123 s->mant2_cnt = 2;
1555 66123 v = 128;
1556 66123 break;
1557 63861 default:
1558 63861 *s->qmant2_ptr += v;
1559 63861 s->mant2_cnt = 0;
1560 63861 v = 128;
1561 63861 break;
1562 }
1563 198317 break;
1564 203339 case 3:
1565 203339 v = sym_quant(c, e, 7);
1566 203339 break;
1567 89430 case 4:
1568 89430 v = sym_quant(c, e, 11);
1569
2/2
✓ Branch 0 taken 46003 times.
✓ Branch 1 taken 43427 times.
 89430 switch (s->mant4_cnt) {
1570 46003 case 0:
1571 46003 s->qmant4_ptr = &qmant[i];
1572 46003 v = 11 * v;
1573 46003 s->mant4_cnt = 1;
1574 46003 break;
1575 43427 default:
1576 43427 *s->qmant4_ptr += v;
1577 43427 s->mant4_cnt = 0;
1578 43427 v = 128;
1579 43427 break;
1580 }
1581 89430 break;
1582 65709 case 5:
1583 65709 v = sym_quant(c, e, 15);
1584 65709 break;
1585 13306 case 14:
1586 13306 v = asym_quant(c, e, 14);
1587 13306 break;
1588 7452 case 15:
1589 7452 v = asym_quant(c, e, 16);
1590 7452 break;
1591 138291 default:
1592 138291 v = asym_quant(c, e, v - 1);
1593 138291 break;
1594 }
1595 1862892 qmant[i] = v;
1596 }
1597 16422 }
1598
1599
1600 /**
1601 * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
1602 *
1603 * @param s AC-3 encoder private context
1604 */
1605 1251 static void ac3_quantize_mantissas(AC3EncodeContext *s)
1606 {
1607 1251 int blk, ch, ch0=0, got_cpl;
1608
1609
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++) {
1610 7506 AC3Block *block = &s->blocks[blk];
1611 7506 AC3Mant m = { 0 };
1612
1613 7506 got_cpl = !block->cpl_in_use;
1614
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = 1; ch <= s->channels; ch++) {
1615
5/6
✓ Branch 0 taken 8724 times.
✓ Branch 1 taken 7698 times.
✓ Branch 2 taken 4362 times.
✓ Branch 3 taken 4362 times.
✓ Branch 4 taken 4362 times.
✗ Branch 5 not taken.
 16422 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1616 4362 ch0 = ch - 1;
1617 4362 ch = CPL_CH;
1618 4362 got_cpl = 1;
1619 }
1620 16422 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
1621 16422 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
1622 16422 s->ref_bap[ch][blk], block->qmant[ch],
1623 s->start_freq[ch], block->end_freq[ch]);
1624
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 12060 times.
 16422 if (ch == CPL_CH)
1625 4362 ch = ch0;
1626 }
1627 }
1628 1251 }
1629
1630
1631 /*
1632 * Write the AC-3 frame header to the output bitstream.
1633 */
1634 978 static void ac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb)
1635 {
1636 978 AC3EncOptions *opt = &s->options;
1637
1638 978 put_bits_assume_flushed(pb);
1639
1640 978 put_bits(pb, 16, 0x0b77); /* frame header */
1641 978 put_bits(pb, 16, 0); /* crc1: will be filled later */
1642 978 put_bits(pb, 2, s->bit_alloc.sr_code);
1643 978 put_bits(pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
1644 978 put_bits(pb, 5, s->bitstream_id);
1645 978 put_bits(pb, 3, s->bitstream_mode);
1646 978 put_bits(pb, 3, s->channel_mode);
1647
4/4
✓ Branch 0 taken 532 times.
✓ Branch 1 taken 446 times.
✓ Branch 2 taken 8 times.
✓ Branch 3 taken 524 times.
 978 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
1648 8 put_bits(pb, 2, s->center_mix_level);
1649
2/2
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 970 times.
 978 if (s->channel_mode & 0x04)
1650 8 put_bits(pb, 2, s->surround_mix_level);
1651
2/2
✓ Branch 0 taken 446 times.
✓ Branch 1 taken 532 times.
 978 if (s->channel_mode == AC3_CHMODE_STEREO)
1652 446 put_bits(pb, 2, opt->dolby_surround_mode);
1653 978 put_bits(pb, 1, s->lfe_on); /* LFE */
1654 978 put_bits(pb, 5, -opt->dialogue_level);
1655 978 put_bits(pb, 1, 0); /* no compression control word */
1656 978 put_bits(pb, 1, 0); /* no lang code */
1657 978 put_bits(pb, 1, opt->audio_production_info);
1658
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 978 times.
 978 if (opt->audio_production_info) {
1659 ✗ put_bits(pb, 5, opt->mixing_level - 80);
1660 ✗ put_bits(pb, 2, opt->room_type);
1661 }
1662 978 put_bits(pb, 1, opt->copyright);
1663 978 put_bits(pb, 1, opt->original);
1664
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 978 times.
 978 if (s->bitstream_id == 6) {
1665 /* alternate bit stream syntax */
1666 ✗ put_bits(pb, 1, opt->extended_bsi_1);
1667 ✗ if (opt->extended_bsi_1) {
1668 ✗ put_bits(pb, 2, opt->preferred_stereo_downmix);
1669 ✗ put_bits(pb, 3, s->ltrt_center_mix_level);
1670 ✗ put_bits(pb, 3, s->ltrt_surround_mix_level);
1671 ✗ put_bits(pb, 3, s->loro_center_mix_level);
1672 ✗ put_bits(pb, 3, s->loro_surround_mix_level);
1673 }
1674 ✗ put_bits(pb, 1, opt->extended_bsi_2);
1675 ✗ if (opt->extended_bsi_2) {
1676 ✗ put_bits(pb, 2, opt->dolby_surround_ex_mode);
1677 ✗ put_bits(pb, 2, opt->dolby_headphone_mode);
1678 ✗ put_bits(pb, 1, opt->ad_converter_type);
1679 ✗ put_bits(pb, 9, 0); /* xbsi2 and encinfo : reserved */
1680 }
1681 } else {
1682 978 put_bits(pb, 1, 0); /* no time code 1 */
1683 978 put_bits(pb, 1, 0); /* no time code 2 */
1684 }
1685 978 put_bits(pb, 1, 0); /* no additional bit stream info */
1686 978 }
1687
1688
1689 /*
1690 * Write one audio block to the output bitstream.
1691 */
1692 7506 static void output_audio_block(AC3EncodeContext *s, PutBitContext *pb, int blk)
1693 {
1694 7506 int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
1695 7506 AC3Block *block = &s->blocks[blk];
1696
1697 /* block switching */
1698
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1699
2/2
✓ Branch 0 taken 8736 times.
✓ Branch 1 taken 5868 times.
 14604 for (ch = 0; ch < s->fbw_channels; ch++)
1700 8736 put_bits(pb, 1, 0);
1701 }
1702
1703 /* dither flags */
1704
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1705
2/2
✓ Branch 0 taken 8736 times.
✓ Branch 1 taken 5868 times.
 14604 for (ch = 0; ch < s->fbw_channels; ch++)
1706 8736 put_bits(pb, 1, 1);
1707 }
1708
1709 /* dynamic range codes */
1710 7506 put_bits(pb, 1, 0);
1711
1712 /* spectral extension */
1713
2/2
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 5868 times.
 7506 if (s->eac3)
1714 1638 put_bits(pb, 1, 0);
1715
1716 /* channel coupling */
1717
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3)
1718 5868 put_bits(pb, 1, block->new_cpl_strategy);
1719
2/2
✓ Branch 0 taken 1251 times.
✓ Branch 1 taken 6255 times.
 7506 if (block->new_cpl_strategy) {
1720
2/2
✓ Branch 0 taken 978 times.
✓ Branch 1 taken 273 times.
 1251 if (!s->eac3)
1721 978 put_bits(pb, 1, block->cpl_in_use);
1722
2/2
✓ Branch 0 taken 727 times.
✓ Branch 1 taken 524 times.
 1251 if (block->cpl_in_use) {
1723 int start_sub, end_sub;
1724
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
 727 if (s->eac3)
1725 273 put_bits(pb, 1, 0); /* enhanced coupling */
1726
3/4
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 273 times.
 727 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
1727
2/2
✓ Branch 0 taken 932 times.
✓ Branch 1 taken 454 times.
 1386 for (ch = 1; ch <= s->fbw_channels; ch++)
1728 932 put_bits(pb, 1, block->channel_in_cpl[ch]);
1729 }
1730
2/2
✓ Branch 0 taken 719 times.
✓ Branch 1 taken 8 times.
 727 if (s->channel_mode == AC3_CHMODE_STEREO)
1731 719 put_bits(pb, 1, 0); /* phase flags in use */
1732 727 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
1733 727 end_sub = (s->cpl_end_freq - 37) / 12;
1734 727 put_bits(pb, 4, start_sub);
1735 727 put_bits(pb, 4, end_sub - 3);
1736 /* coupling band structure */
1737
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 454 times.
 727 if (s->eac3) {
1738 273 put_bits(pb, 1, 0); /* use default */
1739 } else {
1740
2/2
✓ Branch 0 taken 1800 times.
✓ Branch 1 taken 454 times.
 2254 for (bnd = start_sub+1; bnd < end_sub; bnd++)
1741 1800 put_bits(pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
1742 }
1743 }
1744 }
1745
1746 /* coupling coordinates */
1747
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 3144 times.
 7506 if (block->cpl_in_use) {
1748
2/2
✓ Branch 0 taken 8868 times.
✓ Branch 1 taken 4362 times.
 13230 for (ch = 1; ch <= s->fbw_channels; ch++) {
1749
1/2
✓ Branch 0 taken 8868 times.
✗ Branch 1 not taken.
 8868 if (block->channel_in_cpl[ch]) {
1750
4/4
✓ Branch 0 taken 3276 times.
✓ Branch 1 taken 5592 times.
✓ Branch 2 taken 2730 times.
✓ Branch 3 taken 546 times.
 8868 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1751 8322 put_bits(pb, 1, block->new_cpl_coords[ch]);
1752
2/2
✓ Branch 0 taken 1513 times.
✓ Branch 1 taken 7355 times.
 8868 if (block->new_cpl_coords[ch]) {
1753 1513 put_bits(pb, 2, block->cpl_master_exp[ch]);
1754
2/2
✓ Branch 0 taken 5966 times.
✓ Branch 1 taken 1513 times.
 7479 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
1755 5966 put_bits(pb, 4, block->cpl_coord_exp [ch][bnd]);
1756 5966 put_bits(pb, 4, block->cpl_coord_mant[ch][bnd]);
1757 }
1758 }
1759 }
1760 }
1761 }
1762
1763 /* stereo rematrixing */
1764
2/2
✓ Branch 0 taken 4314 times.
✓ Branch 1 taken 3192 times.
 7506 if (s->channel_mode == AC3_CHMODE_STEREO) {
1765
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2676 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4314 if (!s->eac3 || blk > 0)
1766 4041 put_bits(pb, 1, block->new_rematrixing_strategy);
1767
2/2
✓ Branch 0 taken 2197 times.
✓ Branch 1 taken 2117 times.
 4314 if (block->new_rematrixing_strategy) {
1768 /* rematrixing flags */
1769
2/2
✓ Branch 0 taken 8788 times.
✓ Branch 1 taken 2197 times.
 10985 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
1770 8788 put_bits(pb, 1, block->rematrixing_flags[bnd]);
1771 }
1772 }
1773
1774 /* exponent strategy */
1775
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1776
2/2
✓ Branch 0 taken 11460 times.
✓ Branch 1 taken 5868 times.
 17328 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
1777 11460 put_bits(pb, 2, s->exp_strategy[ch][blk]);
1778
2/2
✓ Branch 0 taken 48 times.
✓ Branch 1 taken 5820 times.
 5868 if (s->lfe_on)
1779 48 put_bits(pb, 1, s->exp_strategy[s->lfe_channel][blk]);
1780 }
1781
1782 /* bandwidth */
1783
2/2
✓ Branch 0 taken 12012 times.
✓ Branch 1 taken 7506 times.
 19518 for (ch = 1; ch <= s->fbw_channels; ch++) {
1784
4/4
✓ Branch 0 taken 2320 times.
✓ Branch 1 taken 9692 times.
✓ Branch 2 taken 746 times.
✓ Branch 3 taken 1574 times.
 12012 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
1785 746 put_bits(pb, 6, s->bandwidth_code);
1786 }
1787
1788 /* exponents */
1789
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1790 int nb_groups;
1791 16422 int cpl = (ch == CPL_CH);
1792
1793
2/2
✓ Branch 0 taken 12644 times.
✓ Branch 1 taken 3778 times.
 16422 if (s->exp_strategy[ch][blk] == EXP_REUSE)
1794 12644 continue;
1795
1796 /* DC exponent */
1797 3778 put_bits(pb, 4, block->grouped_exp[ch][0] >> cpl);
1798
1799 /* exponent groups */
1800 3778 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
1801
2/2
✓ Branch 0 taken 109413 times.
✓ Branch 1 taken 3778 times.
 113191 for (i = 1; i <= nb_groups; i++)
1802 109413 put_bits(pb, 7, block->grouped_exp[ch][i]);
1803
1804 /* gain range info */
1805
4/4
✓ Branch 0 taken 3770 times.
✓ Branch 1 taken 8 times.
✓ Branch 2 taken 2320 times.
✓ Branch 3 taken 1450 times.
 3778 if (ch != s->lfe_channel && !cpl)
1806 2320 put_bits(pb, 2, 0);
1807 }
1808
1809 /* bit allocation info */
1810
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1811 5868 baie = (blk == 0);
1812 5868 put_bits(pb, 1, baie);
1813
2/2
✓ Branch 0 taken 978 times.
✓ Branch 1 taken 4890 times.
 5868 if (baie) {
1814 978 put_bits(pb, 2, s->slow_decay_code);
1815 978 put_bits(pb, 2, s->fast_decay_code);
1816 978 put_bits(pb, 2, s->slow_gain_code);
1817 978 put_bits(pb, 2, s->db_per_bit_code);
1818 978 put_bits(pb, 3, s->floor_code);
1819 }
1820 }
1821
1822 /* snr offset */
1823
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1824 5868 put_bits(pb, 1, block->new_snr_offsets);
1825
2/2
✓ Branch 0 taken 978 times.
✓ Branch 1 taken 4890 times.
 5868 if (block->new_snr_offsets) {
1826 978 put_bits(pb, 6, s->coarse_snr_offset);
1827
2/2
✓ Branch 0 taken 1918 times.
✓ Branch 1 taken 978 times.
 2896 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1828 1918 put_bits(pb, 4, s->fine_snr_offset[ch]);
1829 1918 put_bits(pb, 3, s->fast_gain_code[ch]);
1830 }
1831 }
1832 } else {
1833 1638 put_bits(pb, 1, 0); /* no converter snr offset */
1834 }
1835
1836 /* coupling leak */
1837
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 3144 times.
 7506 if (block->cpl_in_use) {
1838
4/4
✓ Branch 0 taken 1638 times.
✓ Branch 1 taken 2724 times.
✓ Branch 2 taken 1365 times.
✓ Branch 3 taken 273 times.
 4362 if (!s->eac3 || block->new_cpl_leak != 2)
1839 4089 put_bits(pb, 1, block->new_cpl_leak);
1840
2/2
✓ Branch 0 taken 727 times.
✓ Branch 1 taken 3635 times.
 4362 if (block->new_cpl_leak) {
1841 727 put_bits(pb, 3, s->bit_alloc.cpl_fast_leak);
1842 727 put_bits(pb, 3, s->bit_alloc.cpl_slow_leak);
1843 }
1844 }
1845
1846
2/2
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 1638 times.
 7506 if (!s->eac3) {
1847 5868 put_bits(pb, 1, 0); /* no delta bit allocation */
1848 5868 put_bits(pb, 1, 0); /* no data to skip */
1849 }
1850
1851 /* mantissas */
1852 7506 got_cpl = !block->cpl_in_use;
1853
2/2
✓ Branch 0 taken 16422 times.
✓ Branch 1 taken 7506 times.
 23928 for (ch = 1; ch <= s->channels; ch++) {
1854 int b, q;
1855
1856
5/6
✓ Branch 0 taken 8724 times.
✓ Branch 1 taken 7698 times.
✓ Branch 2 taken 4362 times.
✓ Branch 3 taken 4362 times.
✓ Branch 4 taken 4362 times.
✗ Branch 5 not taken.
 16422 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1857 4362 ch0 = ch - 1;
1858 4362 ch = CPL_CH;
1859 4362 got_cpl = 1;
1860 }
1861
2/2
✓ Branch 0 taken 1862892 times.
✓ Branch 1 taken 16422 times.
 1879314 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
1862 1862892 q = block->qmant[ch][i];
1863 1862892 b = s->ref_bap[ch][blk][i];
1864
8/8
✓ Branch 0 taken 631705 times.
✓ Branch 1 taken 515343 times.
✓ Branch 2 taken 198317 times.
✓ Branch 3 taken 203339 times.
✓ Branch 4 taken 89430 times.
✓ Branch 5 taken 13306 times.
✓ Branch 6 taken 7452 times.
✓ Branch 7 taken 204000 times.
 1862892 switch (b) {
1865 631705 case 0: break;
1866
2/2
✓ Branch 0 taken 174069 times.
✓ Branch 1 taken 341274 times.
 515343 case 1: if (q != 128) put_bits (pb, 5, q); break;
1867
2/2
✓ Branch 0 taken 68333 times.
✓ Branch 1 taken 129984 times.
 198317 case 2: if (q != 128) put_bits (pb, 7, q); break;
1868 203339 case 3: put_sbits(pb, 3, q); break;
1869
2/2
✓ Branch 0 taken 46003 times.
✓ Branch 1 taken 43427 times.
 89430 case 4: if (q != 128) put_bits (pb, 7, q); break;
1870 13306 case 14: put_sbits(pb, 14, q); break;
1871 7452 case 15: put_sbits(pb, 16, q); break;
1872 204000 default: put_sbits(pb, b-1, q); break;
1873 }
1874 }
1875
2/2
✓ Branch 0 taken 4362 times.
✓ Branch 1 taken 12060 times.
 16422 if (ch == CPL_CH)
1876 4362 ch = ch0;
1877 }
1878 7506 }
1879
1880
1881 /** CRC-16 Polynomial */
1882 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
1883
1884
1885 1309 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
1886 {
1887 unsigned int c;
1888
1889 1309 c = 0;
1890
2/2
✓ Branch 0 taken 19449 times.
✓ Branch 1 taken 1309 times.
 20758 while (a) {
1891
2/2
✓ Branch 0 taken 9025 times.
✓ Branch 1 taken 10424 times.
 19449 if (a & 1)
1892 9025 c ^= b;
1893 19449 a = a >> 1;
1894 19449 b = b << 1;
1895
2/2
✓ Branch 0 taken 9286 times.
✓ Branch 1 taken 10163 times.
 19449 if (b & (1 << 16))
1896 9286 b ^= poly;
1897 }
1898 1309 return c;
1899 }
1900
1901
1902 22 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
1903 {
1904 unsigned int r;
1905 22 r = 1;
1906
2/2
✓ Branch 0 taken 264 times.
✓ Branch 1 taken 22 times.
 286 while (n) {
1907
2/2
✓ Branch 0 taken 67 times.
✓ Branch 1 taken 197 times.
 264 if (n & 1)
1908 67 r = mul_poly(r, a, poly);
1909 264 a = mul_poly(a, a, poly);
1910 264 n >>= 1;
1911 }
1912 22 return r;
1913 }
1914
1915
1916 /*
1917 * Fill the end of the frame with 0's and compute the two CRCs.
1918 */
1919 1251 static void output_frame_end(AC3EncodeContext *s, PutBitContext *pb)
1920 {
1921 1251 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
1922 int frame_size_58, pad_bytes, crc1, crc2, crc_inv;
1923 uint8_t *frame;
1924
1925 1251 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
1926
1927 /* pad the remainder of the frame with zeros */
1928 av_assert2(s->frame_size * 8 - put_bits_count(pb) >= 18);
1929 1251 flush_put_bits(pb);
1930 1251 frame = pb->buf;
1931 1251 pad_bytes = s->frame_size - (put_bits_ptr(pb) - frame) - 2;
1932 av_assert2(pad_bytes >= 0);
1933
2/2
✓ Branch 0 taken 1107 times.
✓ Branch 1 taken 144 times.
 1251 if (pad_bytes > 0)
1934 1107 memset(put_bits_ptr(pb), 0, pad_bytes);
1935
1936
2/2
✓ Branch 0 taken 273 times.
✓ Branch 1 taken 978 times.
 1251 if (s->eac3) {
1937 /* compute crc2 */
1938 273 crc2 = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 4);
1939 } else {
1940 /* compute crc1 */
1941 /* this is not so easy because it is at the beginning of the data... */
1942 978 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
1943 978 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
1944 978 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
1945 978 AV_WB16(frame + 2, crc1);
1946
1947 /* compute crc2 */
1948 978 crc2 = av_crc(crc_ctx, 0, frame + frame_size_58,
1949 978 s->frame_size - frame_size_58 - 2);
1950 }
1951 1251 crc2 = av_bswap16(crc2);
1952 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
1953
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (crc2 == 0x0B77) {
1954 /* The CRC generator polynomial is x^16 + x^15 + x^2 + 1,
1955 * so xor'ing with 0x18005 does not affect the CRC. */
1956 ✗ frame[s->frame_size - 3] ^= 0x1;
1957 ✗ crc2 ^= 0x8005;
1958 }
1959 1251 AV_WB16(frame + s->frame_size - 2, crc2);
1960 1251 }
1961
1962
1963 /**
1964 * Write the frame to the output bitstream.
1965 *
1966 * @param s AC-3 encoder private context
1967 * @param frame output data buffer
1968 */
1969 1251 static void ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
1970 {
1971 PutBitContext pb;
1972 int blk;
1973
1974 1251 init_put_bits(&pb, frame, s->frame_size);
1975
1976 1251 s->output_frame_header(s, &pb);
1977
1978
2/2
✓ Branch 0 taken 7506 times.
✓ Branch 1 taken 1251 times.
 8757 for (blk = 0; blk < s->num_blocks; blk++)
1979 7506 output_audio_block(s, &pb, blk);
1980
1981 1251 output_frame_end(s, &pb);
1982 1251 }
1983
1984 1251 int ff_ac3_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1985 const AVFrame *frame, int *got_packet_ptr)
1986 {
1987 1251 AC3EncodeContext *const s = avctx->priv_data;
1988 int ret;
1989
1990
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (s->options.allow_per_frame_metadata) {
1991 ✗ ret = ac3_validate_metadata(s);
1992 ✗ if (ret)
1993 ✗ return ret;
1994 }
1995
1996
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 1251 if (s->bit_alloc.sr_code == 1 || s->eac3)
1997 1251 ac3_adjust_frame_size(s);
1998
1999 1251 s->encode_frame(s, frame->extended_data);
2000
2001 1251 ac3_apply_rematrixing(s);
2002
2003 1251 ac3_process_exponents(s);
2004
2005 1251 ret = ac3_compute_bit_allocation(s);
2006
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (ret) {
2007 ✗ av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
2008 ✗ return ret;
2009 }
2010
2011 1251 ac3_group_exponents(s);
2012
2013 1251 ac3_quantize_mantissas(s);
2014
2015 1251 ret = ff_get_encode_buffer(avctx, avpkt, s->frame_size, 0);
2016
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 1251 times.
 1251 if (ret < 0)
2017 ✗ return ret;
2018 1251 ac3_output_frame(s, avpkt->data);
2019
2020
1/2
✓ Branch 0 taken 1251 times.
✗ Branch 1 not taken.
 1251 if (frame->pts != AV_NOPTS_VALUE)
2021 1251 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
2022
2023 1251 *got_packet_ptr = 1;
2024 1251 return 0;
2025 }
2026
2027 11 static void dprint_options(AC3EncodeContext *s)
2028 {
2029 #ifdef DEBUG
2030 AVCodecContext *avctx = s->avctx;
2031 AC3EncOptions *opt = &s->options;
2032 const char *msg;
2033 char strbuf[32];
2034
2035 switch (s->bitstream_id) {
2036 case 6: msg = "AC-3 (alt syntax)"; break;
2037 case 8: msg = "AC-3 (standard)"; break;
2038 case 16: msg = "E-AC-3 (enhanced)"; break;
2039 default: msg = "ERROR";
2040 }
2041 ff_dlog(avctx, "bitstream_id: %s (%d)\n", msg, s->bitstream_id);
2042 ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
2043 av_channel_layout_describe(&avctx->ch_layout, strbuf, sizeof(strbuf));
2044 ff_dlog(avctx, "channel_layout: %s\n", strbuf);
2045 ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
2046 ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
2047 ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
2048 if (s->cutoff)
2049 ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
2050
2051 ff_dlog(avctx, "per_frame_metadata: %s\n",
2052 opt->allow_per_frame_metadata?"on":"off");
2053 if (s->has_center)
2054 ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
2055 s->center_mix_level);
2056 else
2057 ff_dlog(avctx, "center_mixlev: {not written}\n");
2058 if (s->has_surround)
2059 ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
2060 s->surround_mix_level);
2061 else
2062 ff_dlog(avctx, "surround_mixlev: {not written}\n");
2063 if (opt->audio_production_info) {
2064 ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
2065 switch (opt->room_type) {
2066 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2067 case AC3ENC_OPT_LARGE_ROOM: msg = "large"; break;
2068 case AC3ENC_OPT_SMALL_ROOM: msg = "small"; break;
2069 default:
2070 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->room_type);
2071 msg = strbuf;
2072 }
2073 ff_dlog(avctx, "room_type: %s\n", msg);
2074 } else {
2075 ff_dlog(avctx, "mixing_level: {not written}\n");
2076 ff_dlog(avctx, "room_type: {not written}\n");
2077 }
2078 ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
2079 ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
2080 if (s->channel_mode == AC3_CHMODE_STEREO) {
2081 switch (opt->dolby_surround_mode) {
2082 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2083 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2084 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2085 default:
2086 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_mode);
2087 msg = strbuf;
2088 }
2089 ff_dlog(avctx, "dsur_mode: %s\n", msg);
2090 } else {
2091 ff_dlog(avctx, "dsur_mode: {not written}\n");
2092 }
2093 ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
2094
2095 if (s->bitstream_id == 6) {
2096 if (opt->extended_bsi_1) {
2097 switch (opt->preferred_stereo_downmix) {
2098 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2099 case AC3ENC_OPT_DOWNMIX_LTRT: msg = "ltrt"; break;
2100 case AC3ENC_OPT_DOWNMIX_LORO: msg = "loro"; break;
2101 default:
2102 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->preferred_stereo_downmix);
2103 msg = strbuf;
2104 }
2105 ff_dlog(avctx, "dmix_mode: %s\n", msg);
2106 ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
2107 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
2108 ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
2109 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
2110 ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
2111 opt->loro_center_mix_level, s->loro_center_mix_level);
2112 ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
2113 opt->loro_surround_mix_level, s->loro_surround_mix_level);
2114 } else {
2115 ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
2116 }
2117 if (opt->extended_bsi_2) {
2118 switch (opt->dolby_surround_ex_mode) {
2119 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2120 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2121 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2122 default:
2123 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_ex_mode);
2124 msg = strbuf;
2125 }
2126 ff_dlog(avctx, "dsurex_mode: %s\n", msg);
2127 switch (opt->dolby_headphone_mode) {
2128 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2129 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2130 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2131 default:
2132 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_headphone_mode);
2133 msg = strbuf;
2134 }
2135 ff_dlog(avctx, "dheadphone_mode: %s\n", msg);
2136
2137 switch (opt->ad_converter_type) {
2138 case AC3ENC_OPT_ADCONV_STANDARD: msg = "standard"; break;
2139 case AC3ENC_OPT_ADCONV_HDCD: msg = "hdcd"; break;
2140 default:
2141 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->ad_converter_type);
2142 msg = strbuf;
2143 }
2144 ff_dlog(avctx, "ad_conv_type: %s\n", msg);
2145 } else {
2146 ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
2147 }
2148 }
2149 #endif
2150 11 }
2151
2152 /**
2153 * Finalize encoding and free any memory allocated by the encoder.
2154 *
2155 * @param avctx Codec context
2156 */
2157 11 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
2158 {
2159 11 AC3EncodeContext *s = avctx->priv_data;
2160
2161
2/2
✓ Branch 0 taken 19 times.
✓ Branch 1 taken 11 times.
 30 for (int ch = 0; ch < s->channels; ch++)
2162 19 av_freep(&s->planar_samples[ch]);
2163 11 av_freep(&s->bap_buffer);
2164 11 av_freep(&s->bap1_buffer);
2165 11 av_freep(&s->mdct_coef_buffer);
2166 11 av_freep(&s->fixed_coef_buffer);
2167 11 av_freep(&s->exp_buffer);
2168 11 av_freep(&s->grouped_exp_buffer);
2169 11 av_freep(&s->psd_buffer);
2170 11 av_freep(&s->band_psd_buffer);
2171 11 av_freep(&s->mask_buffer);
2172 11 av_freep(&s->qmant_buffer);
2173 11 av_freep(&s->cpl_coord_buffer);
2174 11 av_freep(&s->fdsp);
2175
2176 11 av_tx_uninit(&s->tx);
2177
2178 11 return 0;
2179 }
2180
2181
2182 /*
2183 * Set channel information during initialization.
2184 */
2185 11 static av_cold void set_channel_info(AVCodecContext *avctx)
2186 {
2187 11 AC3EncodeContext *s = avctx->priv_data;
2188 11 uint64_t mask = av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0);
2189 11 int channels = avctx->ch_layout.nb_channels;
2190
2191 11 s->lfe_on = !!(mask & AV_CH_LOW_FREQUENCY);
2192 11 s->channels = channels;
2193 11 s->fbw_channels = channels - s->lfe_on;
2194
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
2195
2196
3/8
✓ Branch 0 taken 7 times.
✓ Branch 1 taken 3 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
✓ Branch 6 taken 1 times.
✗ Branch 7 not taken.
 11 switch (mask & ~AV_CH_LOW_FREQUENCY) {
2197 7 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
2198 3 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
2199 ✗ case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
2200 ✗ case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
2201 ✗ case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
2202 ✗ case AV_CH_LAYOUT_QUAD:
2203 ✗ case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
2204 1 case AV_CH_LAYOUT_5POINT0:
2205 1 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
2206 }
2207
4/4
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 3 times.
✓ Branch 2 taken 1 times.
✓ Branch 3 taken 7 times.
 11 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
2208 11 s->has_surround = s->channel_mode & 0x04;
2209
2210 11 s->channel_map = ac3_enc_channel_map[s->channel_mode][s->lfe_on];
2211 11 }
2212
2213
2214 11 static av_cold int validate_options(AC3EncodeContext *s)
2215 {
2216 11 AVCodecContext *avctx = s->avctx;
2217 int ret;
2218
2219 11 set_channel_info(avctx);
2220
2221 22 for (int i = 0;; i++) {
2222
2/2
✓ Branch 0 taken 11 times.
✓ Branch 1 taken 11 times.
 22 if (ff_ac3_sample_rate_tab[i] == avctx->sample_rate) {
2223 11 s->bit_alloc.sr_code = i;
2224 11 break;
2225 }
2226 av_assert1(ff_ac3_sample_rate_tab[i] != 0);
2227 }
2228 11 s->sample_rate = avctx->sample_rate;
2229
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 s->bitstream_id = s->eac3 ? 16 : 8;
2230
2231 /* select a default bit rate if not set by the user */
2232
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 5 times.
 11 if (!avctx->bit_rate) {
2233
1/6
✓ Branch 0 taken 6 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✗ Branch 5 not taken.
 6 switch (s->fbw_channels) {
2234 6 case 1: avctx->bit_rate = 96000; break;
2235 ✗ case 2: avctx->bit_rate = 192000; break;
2236 ✗ case 3: avctx->bit_rate = 320000; break;
2237 ✗ case 4: avctx->bit_rate = 384000; break;
2238 ✗ case 5: avctx->bit_rate = 448000; break;
2239 }
2240 }
2241
2242 /* validate bit rate */
2243
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->eac3) {
2244 int max_br, min_br, wpf, min_br_code;
2245 int num_blks_code, num_blocks, frame_samples;
2246 long long min_br_dist;
2247
2248 /* calculate min/max bitrate */
2249 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
2250 found use either 6 blocks or 1 block, even though 2 or 3 blocks
2251 would work as far as the bit rate is concerned. */
2252
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
2253 1 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
2254 1 frame_samples = AC3_BLOCK_SIZE * num_blocks;
2255 1 max_br = 2048 * s->sample_rate / frame_samples * 16;
2256 1 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
2257
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 if (avctx->bit_rate <= max_br)
2258 1 break;
2259 }
2260
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) {
2261 ✗ av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
2262 "for this sample rate\n", min_br, max_br);
2263 ✗ return AVERROR(EINVAL);
2264 }
2265 1 s->num_blks_code = num_blks_code;
2266 1 s->num_blocks = num_blocks;
2267
2268 /* calculate words-per-frame for the selected bitrate */
2269 1 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
2270 av_assert1(wpf > 0 && wpf <= 2048);
2271
2272 /* find the closest AC-3 bitrate code to the selected bitrate.
2273 this is needed for lookup tables for bandwidth and coupling
2274 parameter selection */
2275 1 min_br_code = -1;
2276 1 min_br_dist = INT64_MAX;
2277
2/2
✓ Branch 0 taken 19 times.
✓ Branch 1 taken 1 times.
 20 for (int i = 0; i < 19; i++) {
2278 19 long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
2279
2/2
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 10 times.
 19 if (br_dist < min_br_dist) {
2280 9 min_br_dist = br_dist;
2281 9 min_br_code = i;
2282 }
2283 }
2284
2285 /* make sure the minimum frame size is below the average frame size */
2286 1 s->frame_size_code = min_br_code << 1;
2287
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)
2288 ✗ wpf--;
2289 1 s->frame_size_min = 2 * wpf;
2290 } else {
2291 10 int best_br = 0, best_code = 0;
2292 10 long long best_diff = INT64_MAX;
2293
1/2
✓ Branch 0 taken 78 times.
✗ Branch 1 not taken.
 78 for (int i = 0; i < 19; i++) {
2294 78 int br = ff_ac3_bitrate_tab[i] * 1000;
2295 78 long long diff = llabs(br - avctx->bit_rate);
2296
1/2
✓ Branch 0 taken 78 times.
✗ Branch 1 not taken.
 78 if (diff < best_diff) {
2297 78 best_br = br;
2298 78 best_code = i;
2299 78 best_diff = diff;
2300 }
2301
2/2
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 68 times.
 78 if (!best_diff)
2302 10 break;
2303 }
2304 10 avctx->bit_rate = best_br;
2305 10 s->frame_size_code = best_code << 1;
2306 10 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
2307 10 s->num_blks_code = 0x3;
2308 10 s->num_blocks = 6;
2309 }
2310 11 s->bit_rate = avctx->bit_rate;
2311 11 s->frame_size = s->frame_size_min;
2312
2313 /* validate cutoff */
2314
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (avctx->cutoff < 0) {
2315 ✗ av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
2316 ✗ return AVERROR(EINVAL);
2317 }
2318 11 s->cutoff = avctx->cutoff;
2319
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (s->cutoff > (s->sample_rate >> 1))
2320 ✗ s->cutoff = s->sample_rate >> 1;
2321
2322 11 ret = ac3_validate_metadata(s);
2323
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (ret)
2324 ✗ return ret;
2325
2326
1/2
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
 22 s->rematrixing_enabled = s->options.stereo_rematrixing &&
2327
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 8 times.
 11 (s->channel_mode == AC3_CHMODE_STEREO);
2328
2329
1/2
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
 22 s->cpl_enabled = s->options.channel_coupling &&
2330
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 7 times.
 11 s->channel_mode >= AC3_CHMODE_STEREO;
2331
2332 11 return 0;
2333 }
2334
2335
2336 /*
2337 * Set bandwidth for all channels.
2338 * The user can optionally supply a cutoff frequency. Otherwise an appropriate
2339 * default value will be used.
2340 */
2341 11 static av_cold void set_bandwidth(AC3EncodeContext *s)
2342 {
2343 11 int blk, ch, av_uninit(cpl_start);
2344
2345
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (s->cutoff) {
2346 /* calculate bandwidth based on user-specified cutoff frequency */
2347 int fbw_coeffs;
2348 ✗ fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
2349 ✗ s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
2350 } else {
2351 /* use default bandwidth setting */
2352 11 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
2353 }
2354
2355 /* set number of coefficients for each channel */
2356
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 11 times.
 29 for (ch = 1; ch <= s->fbw_channels; ch++) {
2357 18 s->start_freq[ch] = 0;
2358
2/2
✓ Branch 0 taken 108 times.
✓ Branch 1 taken 18 times.
 126 for (blk = 0; blk < s->num_blocks; blk++)
2359 108 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
2360 }
2361 /* LFE channel always has 7 coefs */
2362
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 10 times.
 11 if (s->lfe_on) {
2363 1 s->start_freq[s->lfe_channel] = 0;
2364
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 1 times.
 7 for (blk = 0; blk < s->num_blocks; blk++)
2365 6 s->blocks[blk].end_freq[ch] = 7;
2366 }
2367
2368 /* initialize coupling strategy */
2369
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 7 times.
 11 if (s->cpl_enabled) {
2370
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 4 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
2371 ✗ cpl_start = s->options.cpl_start;
2372 } else {
2373 4 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
2374
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 4 if (cpl_start < 0) {
2375 ✗ if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
2376 ✗ s->cpl_enabled = 0;
2377 else
2378 ✗ cpl_start = 15;
2379 }
2380 }
2381 }
2382
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 7 times.
 11 if (s->cpl_enabled) {
2383 int i, cpl_start_band, cpl_end_band;
2384 4 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
2385
2386 4 cpl_end_band = s->bandwidth_code / 4 + 3;
2387 4 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
2388
2389 4 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
2390
2391 4 s->num_cpl_bands = 1;
2392 4 *cpl_band_sizes = 12;
2393
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 4 times.
 18 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
2394
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 10 times.
 14 if (ff_eac3_default_cpl_band_struct[i]) {
2395 4 *cpl_band_sizes += 12;
2396 } else {
2397 10 s->num_cpl_bands++;
2398 10 cpl_band_sizes++;
2399 10 *cpl_band_sizes = 12;
2400 }
2401 }
2402
2403 4 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
2404 4 s->cpl_end_freq = cpl_end_band * 12 + 37;
2405
2/2
✓ Branch 0 taken 24 times.
✓ Branch 1 taken 4 times.
 28 for (blk = 0; blk < s->num_blocks; blk++)
2406 24 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
2407 }
2408 11 }
2409
2410
2411 11 static av_cold int allocate_buffers(AC3EncodeContext *s)
2412 {
2413 int blk, ch;
2414 11 int channels = s->channels + 1; /* includes coupling channel */
2415 11 int channel_blocks = channels * s->num_blocks;
2416 11 int total_coefs = AC3_MAX_COEFS * channel_blocks;
2417 uint8_t *cpl_coord_mant_buffer;
2418 11 const unsigned sampletype_size = SAMPLETYPE_SIZE(s);
2419
2420
2/2
✓ Branch 0 taken 19 times.
✓ Branch 1 taken 11 times.
 30 for (int ch = 0; ch < s->channels; ch++) {
2421 19 s->planar_samples[ch] = av_mallocz(AC3_BLOCK_SIZE * sampletype_size);
2422
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 19 times.
 19 if (!s->planar_samples[ch])
2423 ✗ return AVERROR(ENOMEM);
2424 }
2425
2426
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 if (!FF_ALLOC_TYPED_ARRAY(s->bap_buffer, total_coefs) ||
2427
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->bap1_buffer, total_coefs) ||
2428
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOCZ_TYPED_ARRAY(s->mdct_coef_buffer, total_coefs) ||
2429
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->exp_buffer, total_coefs) ||
2430
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->grouped_exp_buffer, channel_blocks * 128) ||
2431
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->psd_buffer, total_coefs) ||
2432
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->band_psd_buffer, channel_blocks * 64) ||
2433
1/2
✓ Branch 1 taken 11 times.
✗ Branch 2 not taken.
 11 !FF_ALLOC_TYPED_ARRAY(s->mask_buffer, channel_blocks * 64) ||
2434
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 11 times.
 11 !FF_ALLOC_TYPED_ARRAY(s->qmant_buffer, total_coefs))
2435 ✗ return AVERROR(ENOMEM);
2436
2437
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 9 times.
 11 if (!s->fixed_point) {
2438
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 2 times.
 2 if (!FF_ALLOCZ_TYPED_ARRAY(s->fixed_coef_buffer, total_coefs))
2439 ✗ return AVERROR(ENOMEM);
2440 }
2441
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 7 times.
 11 if (s->cpl_enabled) {
2442
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 4 times.
 4 if (!FF_ALLOC_TYPED_ARRAY(s->cpl_coord_buffer, channel_blocks * 32))
2443 ✗ return AVERROR(ENOMEM);
2444 4 cpl_coord_mant_buffer = s->cpl_coord_buffer + 16 * channel_blocks;
2445 }
2446
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 11 times.
 77 for (blk = 0; blk < s->num_blocks; blk++) {
2447 66 AC3Block *block = &s->blocks[blk];
2448
2449
2/2
✓ Branch 0 taken 180 times.
✓ Branch 1 taken 66 times.
 246 for (ch = 0; ch < channels; ch++) {
2450 /* arrangement: block, channel, coeff */
2451 180 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
2452 180 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2453 180 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
2454 180 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
2455 180 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2456
2/2
✓ Branch 0 taken 96 times.
✓ Branch 1 taken 84 times.
 180 if (s->cpl_enabled) {
2457 96 block->cpl_coord_exp[ch] = &s->cpl_coord_buffer [16 * (blk * channels + ch)];
2458 96 block->cpl_coord_mant[ch] = &cpl_coord_mant_buffer[16 * (blk * channels + ch)];
2459 }
2460
2461 /* arrangement: channel, block, coeff */
2462 180 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2463 180 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2464
2/2
✓ Branch 0 taken 144 times.
✓ Branch 1 taken 36 times.
 180 if (s->fixed_point)
2465 144 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
2466 else
2467 36 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2468 }
2469 }
2470
2471 11 return 0;
2472 }
2473
2474
2475 11 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
2476 {
2477 static AVOnce init_static_once = AV_ONCE_INIT;
2478 11 AC3EncodeContext *s = avctx->priv_data;
2479 int ret, frame_size_58;
2480
2481 11 s->avctx = avctx;
2482
2483 11 ret = validate_options(s);
2484
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (ret)
2485 ✗ return ret;
2486
2487 11 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
2488 11 avctx->initial_padding = AC3_BLOCK_SIZE;
2489
2490 11 s->bitstream_mode = avctx->audio_service_type;
2491
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
2492 ✗ s->bitstream_mode = 0x7;
2493
2494 11 s->bits_written = 0;
2495 11 s->samples_written = 0;
2496
2497 /* calculate crc_inv for both possible frame sizes */
2498 11 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
2499 11 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2500
1/2
✓ Branch 0 taken 11 times.
✗ Branch 1 not taken.
 11 if (s->bit_alloc.sr_code == 1) {
2501 11 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
2502 11 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2503 }
2504
2505
2/2
✓ Branch 0 taken 10 times.
✓ Branch 1 taken 1 times.
 11 if (!s->output_frame_header)
2506 10 s->output_frame_header = ac3_output_frame_header;
2507
2508 11 set_bandwidth(s);
2509
2510 11 bit_alloc_init(s);
2511
2512 11 ret = allocate_buffers(s);
2513
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
 11 if (ret)
2514 ✗ return ret;
2515
2516 11 ff_audiodsp_init(&s->adsp);
2517 11 ff_me_cmp_init(&s->mecc, avctx);
2518 11 ff_ac3dsp_init(&s->ac3dsp);
2519
2520 11 dprint_options(s);
2521
2522 11 ff_thread_once(&init_static_once, exponent_init);
2523
2524 11 return 0;
2525 }
2526