FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3enc.c
Date: 2026-08-28 22:32:55
Exec Total Coverage
Lines: 1016 1167 87.1%
Functions: 43 43 100.0%
Branches: 653 837 78.0%
Line Branch Exec Source
1 /*
2 * The simplest AC-3 encoder
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
5 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * The simplest AC-3 encoder.
27 */
28
29 #include <stdint.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/crc.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/mem_internal.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/thread.h"
40 #include "avcodec.h"
41 #include "codec_internal.h"
42 #include "config_components.h"
43 #include "encode.h"
44 #include "me_cmp.h"
45 #include "put_bits.h"
46 #include "audiodsp.h"
47 #include "ac3dsp.h"
48 #include "ac3.h"
49 #include "ac3defs.h"
50 #include "ac3tab.h"
51 #include "ac3enc.h"
52 #include "eac3enc.h"
53
54 #define SAMPLETYPE_SIZE(ctx) (sizeof(float) == sizeof(int32_t) ? sizeof(float) : \
55 (ctx)->fixed_point ? sizeof(int32_t) : sizeof(float))
56
57 typedef struct AC3Mant {
58 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
59 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
60 } AC3Mant;
61
62 #define CMIXLEV_NUM_OPTIONS 3
63 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
64 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
65 };
66
67 #define SURMIXLEV_NUM_OPTIONS 3
68 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
69 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
70 };
71
72 #define EXTMIXLEV_NUM_OPTIONS 8
73 #define extmixlev_options ff_ac3_gain_levels
74
75 /* The first two options apply only to the AC-3 encoders;
76 * the rest is also valid for EAC-3. When modifying it,
77 * it might be necessary to adapt said offset in eac3enc.c. */
78 #define OFFSET(param) offsetof(AC3EncodeContext, options.param)
79 #define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
80 const AVOption ff_ac3_enc_options[] = {
81 /* AC-3 downmix levels */
82 {"center_mixlev", "Center Mix Level", OFFSET(center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_4POINT5DB }, 0.0, 1.0, AC3ENC_PARAM},
83 {"surround_mixlev", "Surround Mix Level", OFFSET(surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = LEVEL_MINUS_6DB }, 0.0, 1.0, AC3ENC_PARAM},
84 /* audio production information */
85 {"mixing_level", "Mixing Level", OFFSET(mixing_level), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 111, AC3ENC_PARAM},
86 {"room_type", "Room Type", OFFSET(room_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_SMALL_ROOM, AC3ENC_PARAM, .unit = "room_type"},
87 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
88 {"large", "Large Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_LARGE_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
89 {"small", "Small Room", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_SMALL_ROOM }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "room_type"},
90 /* Metadata Options */
91 {"per_frame_metadata", "Allow Changing Metadata Per-Frame", OFFSET(allow_per_frame_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AC3ENC_PARAM},
92 {"copyright", "Copyright Bit", OFFSET(copyright), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
93 {"dialnorm", "Dialogue Level (dB)", OFFSET(dialogue_level), AV_OPT_TYPE_INT, {.i64 = -31 }, -31, -1, AC3ENC_PARAM},
94 {"dsur_mode", "Dolby Surround Mode", OFFSET(dolby_surround_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dsur_mode"},
95 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
96 {"on", "Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
97 {"off", "Not Dolby Surround Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsur_mode"},
98 {"original", "Original Bit Stream", OFFSET(original), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, 1, AC3ENC_PARAM},
99 /* extended bitstream information */
100 {"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DOWNMIX_DPLII, AC3ENC_PARAM, .unit = "dmix_mode"},
101 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
102 {"ltrt", "Lt/Rt Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LTRT }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
103 {"loro", "Lo/Ro Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_LORO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
104 {"dplii", "Dolby Pro Logic II Downmix Preferred", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DOWNMIX_DPLII }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dmix_mode"},
105 {"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
106 {"ltrt_surmixlev", "Lt/Rt Surround Mix Level", OFFSET(ltrt_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
107 {"loro_cmixlev", "Lo/Ro Center Mix Level", OFFSET(loro_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
108 {"loro_surmixlev", "Lo/Ro Surround Mix Level", OFFSET(loro_surround_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, AC3ENC_PARAM},
109 {"dsurex_mode", "Dolby Surround EX Mode", OFFSET(dolby_surround_ex_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_DSUREX_DPLIIZ, AC3ENC_PARAM, .unit = "dsurex_mode"},
110 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
111 {"on", "Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
112 {"off", "Not Dolby Surround EX Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
113 {"dpliiz", "Dolby Pro Logic IIz-encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_DSUREX_DPLIIZ }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dsurex_mode"},
114 {"dheadphone_mode", "Dolby Headphone Mode", OFFSET(dolby_headphone_mode), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_MODE_ON, AC3ENC_PARAM, .unit = "dheadphone_mode"},
115 {"notindicated", "Not Indicated (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_NOT_INDICATED }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
116 {"on", "Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_ON }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
117 {"off", "Not Dolby Headphone Encoded", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_MODE_OFF }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "dheadphone_mode"},
118 {"ad_conv_type", "A/D Converter Type", OFFSET(ad_converter_type), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_NONE }, AC3ENC_OPT_NONE, AC3ENC_OPT_ADCONV_HDCD, AC3ENC_PARAM, .unit = "ad_conv_type"},
119 {"standard", "Standard (default)", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_STANDARD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
120 {"hdcd", "HDCD", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_ADCONV_HDCD }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "ad_conv_type"},
121 /* Other Encoding Options */
122 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, AC3ENC_PARAM},
123 {"channel_coupling", "Channel Coupling", OFFSET(channel_coupling), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, AC3ENC_OPT_ON, AC3ENC_PARAM, .unit = "channel_coupling"},
124 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "channel_coupling"},
125 {"cpl_start_band", "Coupling Start Band", OFFSET(cpl_start), AV_OPT_TYPE_INT, {.i64 = AC3ENC_OPT_AUTO }, AC3ENC_OPT_AUTO, 15, AC3ENC_PARAM, .unit = "cpl_start_band"},
126 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, .unit = "cpl_start_band"},
127 {NULL}
128 };
129
130 const AVClass ff_ac3enc_class = {
131 .class_name = "AC-3 Encoder",
132 .item_name = av_default_item_name,
133 .option = ff_ac3_enc_options,
134 .version = LIBAVUTIL_VERSION_INT,
135 };
136
137 const FFCodecDefault ff_ac3_enc_defaults[] = {
138 { "b", "0" },
139 { NULL }
140 };
141
142 /**
143 * LUT for number of exponent groups.
144 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
145 */
146 static uint8_t exponent_group_tab[2][3][256];
147
148
149 /**
150 * List of supported channel layouts.
151 */
152 const AVChannelLayout ff_ac3_ch_layouts[19] = {
153 AV_CHANNEL_LAYOUT_MONO,
154 AV_CHANNEL_LAYOUT_STEREO,
155 AV_CHANNEL_LAYOUT_2_1,
156 AV_CHANNEL_LAYOUT_SURROUND,
157 AV_CHANNEL_LAYOUT_2_2,
158 AV_CHANNEL_LAYOUT_QUAD,
159 AV_CHANNEL_LAYOUT_4POINT0,
160 AV_CHANNEL_LAYOUT_5POINT0,
161 AV_CHANNEL_LAYOUT_5POINT0_BACK,
162 {
163 .nb_channels = 2,
164 .order = AV_CHANNEL_ORDER_NATIVE,
165 .u.mask = AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY,
166 },
167 {
168 .nb_channels = 3,
169 .order = AV_CHANNEL_ORDER_NATIVE,
170 .u.mask = AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY,
171 },
172 {
173 .nb_channels = 4,
174 .order = AV_CHANNEL_ORDER_NATIVE,
175 .u.mask = AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY,
176 },
177 {
178 .nb_channels = 4,
179 .order = AV_CHANNEL_ORDER_NATIVE,
180 .u.mask = AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY,
181 },
182 {
183 .nb_channels = 5,
184 .order = AV_CHANNEL_ORDER_NATIVE,
185 .u.mask = AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY,
186 },
187 AV_CHANNEL_LAYOUT_5POINT1,
188 AV_CHANNEL_LAYOUT_5POINT1_BACK,
189 { 0 },
190 };
191
192 /**
193 * Table to remap channels from SMPTE order to AC-3 order.
194 * [channel_mode][lfe][ch]
195 */
196 static const uint8_t ac3_enc_channel_map[8][2][6] = {
197 COMMON_CHANNEL_MAP
198 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
199 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
200 };
201
202 /**
203 * LUT to select the bandwidth code based on the bit rate, sample rate, and
204 * number of full-bandwidth channels.
205 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
206 */
207 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
208 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
209
210 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
211 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
212 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
213
214 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
215 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
216 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
217
218 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
219 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
220 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
221
222 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
223 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
224 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
225
226 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
227 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
228 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
229 };
230
231
232 /**
233 * LUT to select the coupling start band based on the bit rate, sample rate, and
234 * number of full-bandwidth channels. -1 = coupling off
235 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
236 *
237 * TODO: more testing for optimal parameters.
238 * multi-channel tests at 44.1kHz and 32kHz.
239 */
240 static const int8_t ac3_coupling_start_tab[6][3][19] = {
241 // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
242
243 // 2/0
244 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
245 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
246 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
247
248 // 3/0
249 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
250 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
251 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
252
253 // 2/1 - untested
254 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
255 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
256 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
257
258 // 3/1
259 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
260 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
261 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
262
263 // 2/2 - untested
264 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
265 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
266 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
267
268 // 3/2
269 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
270 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
271 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
272 };
273
274
275 #define FLT_OPTION_THRESHOLD 0.01
276
277 4 static int validate_float_option(float v, const float *v_list, int v_list_size)
278 {
279 int i;
280
281
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282
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 8 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
283
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 8 v > (v_list[i] - FLT_OPTION_THRESHOLD))
284 4 break;
285 }
286
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 4 if (i == v_list_size)
287 ✗ return AVERROR(EINVAL);
288
289 4 return i;
290 }
291
292
293 4 static void validate_mix_level(void *log_ctx, const char *opt_name,
294 float *opt_param, const float *list,
295 int list_size, int default_value, int min_value,
296 int *ctx_param)
297 {
298 4 int mixlev = validate_float_option(*opt_param, list, list_size);
299
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 4 if (mixlev < min_value) {
300 ✗ mixlev = default_value;
301 ✗ if (*opt_param >= 0.0) {
302 ✗ av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
303 ✗ "default value: %0.3f\n", opt_name, list[mixlev]);
304 }
305 }
306 4 *opt_param = list[mixlev];
307 4 *ctx_param = mixlev;
308 4 }
309
310
311 /**
312 * Validate metadata options as set by AVOption system.
313 * These values can optionally be changed per-frame.
314 *
315 * @param s AC-3 encoder private context
316 */
317 16 static int ac3_validate_metadata(AC3EncodeContext *s)
318 {
319 16 AVCodecContext *avctx = s->avctx;
320 16 AC3EncOptions *opt = &s->options;
321
322 16 opt->audio_production_info = 0;
323 16 opt->extended_bsi_1 = 0;
324 16 opt->extended_bsi_2 = 0;
325 16 opt->eac3_mixing_metadata = 0;
326 16 opt->eac3_info_metadata = 0;
327
328 /* determine mixing metadata / xbsi1 use */
329
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 16 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
330 ✗ opt->extended_bsi_1 = 1;
331 ✗ opt->eac3_mixing_metadata = 1;
332 }
333
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 16 if (s->has_center &&
334
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 2 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
335 ✗ opt->extended_bsi_1 = 1;
336 ✗ opt->eac3_mixing_metadata = 1;
337 }
338
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 16 if (s->has_surround &&
339
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 2 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
340 ✗ opt->extended_bsi_1 = 1;
341 ✗ opt->eac3_mixing_metadata = 1;
342 }
343
344
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 16 if (s->eac3) {
345 /* determine info metadata use */
346
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 2 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
347 ✗ opt->eac3_info_metadata = 1;
348
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 2 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
349 ✗ opt->eac3_info_metadata = 1;
350
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351
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 2 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
352 ✗ opt->eac3_info_metadata = 1;
353
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 2 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
354 ✗ opt->eac3_info_metadata = 1;
355
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356
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 2 opt->ad_converter_type != AC3ENC_OPT_NONE) {
357 ✗ opt->audio_production_info = 1;
358 ✗ opt->eac3_info_metadata = 1;
359 }
360 } else {
361 /* determine audio production info use */
362
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 14 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
363 ✗ opt->audio_production_info = 1;
364
365 /* determine xbsi2 use */
366
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 14 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
367 ✗ opt->extended_bsi_2 = 1;
368
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 14 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
369 ✗ opt->extended_bsi_2 = 1;
370
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 14 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
371 ✗ opt->extended_bsi_2 = 1;
372 }
373
374 /* validate AC-3 mixing levels */
375
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 16 if (!s->eac3) {
376
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 14 if (s->has_center) {
377 2 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
378 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
379 &s->center_mix_level);
380 }
381
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 14 if (s->has_surround) {
382 2 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
383 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
384 &s->surround_mix_level);
385 }
386 }
387
388 /* validate extended bsi 1 / mixing metadata */
389
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 16 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
390 /* default preferred stereo downmix */
391 ✗ if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
392 ✗ opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
393 ✗ if (!s->eac3 || s->has_center) {
394 /* validate Lt/Rt center mix level */
395 ✗ validate_mix_level(avctx, "ltrt_center_mix_level",
396 &opt->ltrt_center_mix_level, extmixlev_options,
397 EXTMIXLEV_NUM_OPTIONS, 5, 0,
398 &s->ltrt_center_mix_level);
399 /* validate Lo/Ro center mix level */
400 ✗ validate_mix_level(avctx, "loro_center_mix_level",
401 &opt->loro_center_mix_level, extmixlev_options,
402 EXTMIXLEV_NUM_OPTIONS, 5, 0,
403 &s->loro_center_mix_level);
404 }
405 ✗ if (!s->eac3 || s->has_surround) {
406 /* validate Lt/Rt surround mix level */
407 ✗ validate_mix_level(avctx, "ltrt_surround_mix_level",
408 &opt->ltrt_surround_mix_level, extmixlev_options,
409 EXTMIXLEV_NUM_OPTIONS, 6, 3,
410 &s->ltrt_surround_mix_level);
411 /* validate Lo/Ro surround mix level */
412 ✗ validate_mix_level(avctx, "loro_surround_mix_level",
413 &opt->loro_surround_mix_level, extmixlev_options,
414 EXTMIXLEV_NUM_OPTIONS, 6, 3,
415 &s->loro_surround_mix_level);
416 }
417 }
418
419 /* validate audio service type / channels combination */
420
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 16 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
421 ✗ avctx->ch_layout.nb_channels == 1) ||
422
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423
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 16 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
424
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 16 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
425 ✗ && avctx->ch_layout.nb_channels > 1)) {
426 ✗ av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
427 "specified number of channels\n");
428 ✗ return AVERROR(EINVAL);
429 }
430
431 /* validate extended bsi 2 / info metadata */
432
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 16 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
433 /* default dolby headphone mode */
434 ✗ if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
435 ✗ opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
436 /* default dolby surround ex mode */
437 ✗ if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
438 ✗ opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
439 /* default A/D converter type */
440 ✗ if (opt->ad_converter_type == AC3ENC_OPT_NONE)
441 ✗ opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
442 }
443
444 /* copyright & original defaults */
445
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 16 if (!s->eac3 || opt->eac3_info_metadata) {
446 /* default copyright */
447
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 14 if (opt->copyright == AC3ENC_OPT_NONE)
448 14 opt->copyright = AC3ENC_OPT_OFF;
449 /* default original */
450
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 14 if (opt->original == AC3ENC_OPT_NONE)
451 14 opt->original = AC3ENC_OPT_ON;
452 }
453
454 /* dolby surround mode default */
455
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456
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 14 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
457 14 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
458 }
459
460 /* validate audio production info */
461
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 16 if (opt->audio_production_info) {
462 ✗ if (opt->mixing_level == AC3ENC_OPT_NONE) {
463 ✗ av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
464 "room_type is set\n");
465 ✗ return AVERROR(EINVAL);
466 }
467 ✗ if (opt->mixing_level < 80) {
468 ✗ av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
469 "80dB and 111dB\n");
470 ✗ return AVERROR(EINVAL);
471 }
472 /* default room type */
473 ✗ if (opt->room_type == AC3ENC_OPT_NONE)
474 ✗ opt->room_type = AC3ENC_OPT_NOT_INDICATED;
475 }
476
477 /* set bitstream id for alternate bitstream syntax */
478
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 16 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2))
479 ✗ s->bitstream_id = 6;
480
481 16 return 0;
482 }
483
484 /**
485 * Adjust the frame size to make the average bit rate match the target bit rate.
486 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
487 *
488 * @param s AC-3 encoder private context
489 */
490 1385 static void ac3_adjust_frame_size(AC3EncodeContext *s)
491 {
492
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 1423 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
493 38 s->bits_written -= s->bit_rate;
494 38 s->samples_written -= s->sample_rate;
495 }
496 2770 s->frame_size = s->frame_size_min +
497
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 1385 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
498 1385 s->bits_written += s->frame_size * 8;
499 1385 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
500 1385 }
501
502 /**
503 * Set the initial coupling strategy parameters prior to coupling analysis.
504 *
505 * @param s AC-3 encoder private context
506 */
507 1449 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
508 {
509 int blk, ch;
510 int got_cpl_snr;
511 int num_cpl_blocks;
512
513 /* set coupling use flags for each block/channel */
514 /* TODO: turn coupling on/off and adjust start band based on bit usage */
515
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
516 8694 AC3Block *block = &s->blocks[blk];
517
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 23922 for (ch = 1; ch <= s->fbw_channels; ch++)
518 15228 block->channel_in_cpl[ch] = s->cpl_on;
519 }
520
521 /* enable coupling for each block if at least 2 channels have coupling
522 enabled for that block */
523 1449 got_cpl_snr = 0;
524 1449 num_cpl_blocks = 0;
525
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
526 8694 AC3Block *block = &s->blocks[blk];
527 8694 block->num_cpl_channels = 0;
528
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 23922 for (ch = 1; ch <= s->fbw_channels; ch++)
529 15228 block->num_cpl_channels += block->channel_in_cpl[ch];
530 8694 block->cpl_in_use = block->num_cpl_channels > 1;
531 8694 num_cpl_blocks += block->cpl_in_use;
532
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 8694 if (!block->cpl_in_use) {
533 3522 block->num_cpl_channels = 0;
534
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 8082 for (ch = 1; ch <= s->fbw_channels; ch++)
535 4560 block->channel_in_cpl[ch] = 0;
536 }
537
538 8694 block->new_cpl_strategy = !blk;
539
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 8694 if (blk) {
540
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 19935 for (ch = 1; ch <= s->fbw_channels; ch++) {
541
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 12690 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
542 ✗ block->new_cpl_strategy = 1;
543 ✗ break;
544 }
545 }
546 }
547 8694 block->new_cpl_leak = block->new_cpl_strategy;
548
549
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 8694 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
550 1449 block->new_snr_offsets = 1;
551
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 1449 if (block->cpl_in_use)
552 862 got_cpl_snr = 1;
553 } else {
554 7245 block->new_snr_offsets = 0;
555 }
556 }
557
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 1449 if (!num_cpl_blocks)
558 587 s->cpl_on = 0;
559
560 /* set bandwidth for each channel */
561
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
562 8694 AC3Block *block = &s->blocks[blk];
563
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564
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 15228 if (block->channel_in_cpl[ch])
565 10668 block->end_freq[ch] = s->start_freq[CPL_CH];
566 else
567 4560 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
568 }
569 }
570 1449 }
571
572
573 /**
574 * Apply stereo rematrixing to coefficients based on rematrixing flags.
575 *
576 * @param s AC-3 encoder private context
577 */
578 1449 static void ac3_apply_rematrixing(AC3EncodeContext *s)
579 {
580 int nb_coefs;
581 int blk, bnd, i;
582 int start, end;
583 1449 uint8_t *flags = NULL;
584
585
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 1449 if (!s->rematrixing_enabled)
586 605 return;
587
588
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 5908 for (blk = 0; blk < s->num_blocks; blk++) {
589 5064 AC3Block *block = &s->blocks[blk];
590
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 5064 if (block->new_rematrixing_strategy)
591 2325 flags = block->rematrixing_flags;
592 5064 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
593
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 24744 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
594
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 19680 if (flags[bnd]) {
595 11248 start = ff_ac3_rematrix_band_tab[bnd];
596 11248 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
597
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 247396 for (i = start; i < end; i++) {
598 236148 int32_t lt = block->fixed_coef[1][i];
599 236148 int32_t rt = block->fixed_coef[2][i];
600 236148 block->fixed_coef[1][i] = (lt + rt) >> 1;
601 236148 block->fixed_coef[2][i] = (lt - rt) >> 1;
602 }
603 }
604 }
605 }
606 }
607
608
609 /*
610 * Initialize exponent tables.
611 */
612 16 static av_cold void exponent_init(void)
613 {
614 int expstr, i, grpsize;
615
616
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 64 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
617 48 grpsize = 3 << expstr;
618
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 11760 for (i = 12; i < 256; i++) {
619 11712 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
620 11712 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
621 }
622 }
623 /* LFE */
624 16 exponent_group_tab[0][0][7] = 2;
625 16 }
626
627
628 /*
629 * Extract exponents from the MDCT coefficients.
630 */
631 1449 static void extract_exponents(AC3EncodeContext *s)
632 {
633 1449 int ch = !s->cpl_on;
634 1449 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
635 1449 AC3Block *block = &s->blocks[0];
636
637 1449 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
638 1449 }
639
640
641 /**
642 * Exponent Difference Threshold.
643 * New exponents are sent if their SAD exceed this number.
644 */
645 #define EXP_DIFF_THRESHOLD 500
646
647 /**
648 * Table used to select exponent strategy based on exponent reuse block interval.
649 */
650 static const uint8_t exp_strategy_reuse_tab[4][6] = {
651 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
652 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
653 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
654 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
655 };
656
657 /*
658 * Calculate exponent strategies for all channels.
659 * Array arrangement is reversed to simplify the per-channel calculation.
660 */
661 1449 static void compute_exp_strategy(AC3EncodeContext *s)
662 {
663 int ch, blk, blk1;
664
665
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 4849 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
666 3400 uint8_t *exp_strategy = s->exp_strategy[ch];
667 3400 uint8_t *exp = s->blocks[0].exp[ch];
668 int exp_diff;
669
670 /* estimate if the exponent variation & decide if they should be
671 reused in the next frame */
672 3400 exp_strategy[0] = EXP_NEW;
673 3400 exp += AC3_MAX_COEFS;
674
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 20400 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
675
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 17000 if (ch == CPL_CH) {
676
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 4310 if (!s->blocks[blk-1].cpl_in_use) {
677 ✗ exp_strategy[blk] = EXP_NEW;
678 ✗ continue;
679
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 4310 } else if (!s->blocks[blk].cpl_in_use) {
680 ✗ exp_strategy[blk] = EXP_REUSE;
681 ✗ continue;
682 }
683
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 12690 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
684 ✗ exp_strategy[blk] = EXP_NEW;
685 ✗ continue;
686 }
687 17000 exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
688 17000 exp_strategy[blk] = EXP_REUSE;
689
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 17000 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
690 767 exp_strategy[blk] = EXP_NEW;
691
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 16233 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
692 352 exp_strategy[blk] = EXP_NEW;
693 }
694
695 /* now select the encoding strategy type : if exponents are often
696 recoded, we use a coarse encoding */
697 3400 blk = 0;
698
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 7919 while (blk < s->num_blocks) {
699 4519 blk1 = blk + 1;
700
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 20400 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
701 15881 blk1++;
702 4519 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
703 4519 blk = blk1;
704 }
705 }
706
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 1449 if (s->lfe_on) {
707 18 ch = s->lfe_channel;
708 18 s->exp_strategy[ch][0] = EXP_D15;
709
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 108 for (blk = 1; blk < s->num_blocks; blk++)
710 90 s->exp_strategy[ch][blk] = EXP_REUSE;
711 }
712
713 /* for E-AC-3, determine frame exponent strategy */
714
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 1449 if (CONFIG_EAC3_ENCODER && s->eac3)
715 305 ff_eac3_get_frame_exp_strategy(s);
716 1449 }
717
718
719 /**
720 * Update the exponents so that they are the ones the decoder will decode.
721 *
722 * @param[in,out] exp array of exponents for 1 block in 1 channel
723 * @param nb_exps number of exponents in active bandwidth
724 * @param exp_strategy exponent strategy for the block
725 * @param cpl indicates if the block is in the coupling channel
726 */
727 4537 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
728 int cpl)
729 {
730 int nb_groups, i, k;
731
732 4537 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
733
734 /* for each group, compute the minimum exponent */
735
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 4537 switch(exp_strategy) {
736 577 case EXP_D25:
737
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 29017 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
738 28440 uint8_t exp_min = exp[k];
739
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 28440 if (exp[k+1] < exp_min)
740 8953 exp_min = exp[k+1];
741 28440 exp[i-cpl] = exp_min;
742 28440 k += 2;
743 }
744 577 break;
745 819 case EXP_D45:
746
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 20352 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
747 19533 uint8_t exp_min = exp[k];
748
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 19533 if (exp[k+1] < exp_min)
749 7356 exp_min = exp[k+1];
750
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 19533 if (exp[k+2] < exp_min)
751 3413 exp_min = exp[k+2];
752
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 19533 if (exp[k+3] < exp_min)
753 2205 exp_min = exp[k+3];
754 19533 exp[i-cpl] = exp_min;
755 19533 k += 4;
756 }
757 819 break;
758 }
759
760 /* constraint for DC exponent */
761
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 4537 if (!cpl && exp[0] > 15)
762 1438 exp[0] = 15;
763
764 /* decrease the delta between each groups to within 2 so that they can be
765 differentially encoded */
766
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 426250 for (i = 1; i <= nb_groups; i++)
767 421713 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
768 4537 i--;
769
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 426250 while (--i >= 0)
770 421713 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
771
772
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 4537 if (cpl)
773 1629 exp[-1] = exp[0] & ~1;
774
775 /* now we have the exponent values the decoder will see */
776
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 4537 switch (exp_strategy) {
777 577 case EXP_D25:
778
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 29017 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
779 28440 uint8_t exp1 = exp[i-cpl];
780 28440 exp[k--] = exp1;
781 28440 exp[k--] = exp1;
782 }
783 577 break;
784 819 case EXP_D45:
785
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 20352 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
786 19533 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
787 19533 k -= 4;
788 }
789 819 break;
790 }
791 4537 }
792
793
794 /*
795 * Encode exponents from original extracted form to what the decoder will see.
796 * This copies and groups exponents based on exponent strategy and reduces
797 * deltas between adjacent exponent groups so that they can be differentially
798 * encoded.
799 */
800 1449 static void encode_exponents(AC3EncodeContext *s)
801 {
802 int blk, blk1, ch, cpl;
803 uint8_t *exp, *exp_strategy;
804 int nb_coefs, num_reuse_blocks;
805
806
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 4867 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
807 3418 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
808 3418 exp_strategy = s->exp_strategy[ch];
809
810 3418 cpl = (ch == CPL_CH);
811 3418 blk = 0;
812
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 7955 while (blk < s->num_blocks) {
813 4537 AC3Block *block = &s->blocks[blk];
814
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 4537 if (cpl && !block->cpl_in_use) {
815 ✗ exp += AC3_MAX_COEFS;
816 ✗ blk++;
817 ✗ continue;
818 }
819 4537 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
820 4537 blk1 = blk + 1;
821
822 /* count the number of EXP_REUSE blocks after the current block
823 and set exponent reference block numbers */
824 4537 s->exp_ref_block[ch][blk] = blk;
825
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 20508 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
826 15971 s->exp_ref_block[ch][blk1] = blk;
827 15971 blk1++;
828 }
829 4537 num_reuse_blocks = blk1 - blk - 1;
830
831 /* for the EXP_REUSE case we select the min of the exponents */
832 4537 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
833 AC3_MAX_COEFS);
834
835 4537 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
836
837 4537 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
838 4537 blk = blk1;
839 }
840 }
841
842 /* reference block numbers have been changed, so reset ref_bap_set */
843 1449 s->ref_bap_set = 0;
844 1449 }
845
846
847 /*
848 * Count exponent bits based on bandwidth, coupling, and exponent strategies.
849 */
850 1449 static int count_exponent_bits(AC3EncodeContext *s)
851 {
852 int blk, ch;
853 int nb_groups, bit_count;
854
855 1449 bit_count = 0;
856
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
857 8694 AC3Block *block = &s->blocks[blk];
858
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 29202 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
859 20508 int exp_strategy = s->exp_strategy[ch][blk];
860 20508 int cpl = (ch == CPL_CH);
861 20508 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
862
863
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 20508 if (exp_strategy == EXP_REUSE)
864 15971 continue;
865
866 4537 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
867 4537 bit_count += 4 + (nb_groups * 7);
868 }
869 }
870
871 1449 return bit_count;
872 }
873
874
875 /**
876 * Group exponents.
877 * 3 delta-encoded exponents are in each 7-bit group. The number of groups
878 * varies depending on exponent strategy and bandwidth.
879 *
880 * @param s AC-3 encoder private context
881 */
882 1449 static void ac3_group_exponents(AC3EncodeContext *s)
883 {
884 int blk, ch, i, cpl;
885 int group_size, nb_groups;
886 uint8_t *p;
887 int delta0, delta1, delta2;
888 int exp0, exp1;
889
890
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
891 8694 AC3Block *block = &s->blocks[blk];
892
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 29202 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
893 20508 int exp_strategy = s->exp_strategy[ch][blk];
894
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 20508 if (exp_strategy == EXP_REUSE)
895 15971 continue;
896 4537 cpl = (ch == CPL_CH);
897 4537 group_size = exp_strategy + (exp_strategy == EXP_D45);
898 4537 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
899 4537 p = block->exp[ch] + s->start_freq[ch] - cpl;
900
901 /* DC exponent */
902 4537 exp1 = *p++;
903 4537 block->grouped_exp[ch][0] = exp1;
904
905 /* remaining exponents are delta encoded */
906
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 145108 for (i = 1; i <= nb_groups; i++) {
907 /* merge three delta in one code */
908 140571 exp0 = exp1;
909 140571 exp1 = p[0];
910 140571 p += group_size;
911 140571 delta0 = exp1 - exp0 + 2;
912 av_assert2(delta0 >= 0 && delta0 <= 4);
913
914 140571 exp0 = exp1;
915 140571 exp1 = p[0];
916 140571 p += group_size;
917 140571 delta1 = exp1 - exp0 + 2;
918 av_assert2(delta1 >= 0 && delta1 <= 4);
919
920 140571 exp0 = exp1;
921 140571 exp1 = p[0];
922 140571 p += group_size;
923 140571 delta2 = exp1 - exp0 + 2;
924 av_assert2(delta2 >= 0 && delta2 <= 4);
925
926 140571 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
927 }
928 }
929 }
930 1449 }
931
932
933 /**
934 * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
935 * Extract exponents from MDCT coefficients, calculate exponent strategies,
936 * and encode final exponents.
937 *
938 * @param s AC-3 encoder private context
939 */
940 1449 static void ac3_process_exponents(AC3EncodeContext *s)
941 {
942 1449 extract_exponents(s);
943
944 1449 compute_exp_strategy(s);
945
946 1449 encode_exponents(s);
947 1449 }
948
949
950 /*
951 * Count frame bits that are based solely on fixed parameters.
952 * This only has to be run once when the encoder is initialized.
953 */
954 16 static void count_frame_bits_fixed(AC3EncodeContext *s)
955 {
956 static const uint8_t frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
957 int blk;
958 int frame_bits;
959
960 /* assumptions:
961 * no dynamic range codes
962 * bit allocation parameters do not change between blocks
963 * no delta bit allocation
964 * no skipped data
965 * no auxiliary data
966 * no E-AC-3 metadata
967 */
968
969 /* header */
970 16 frame_bits = 16; /* sync info */
971
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 16 if (s->eac3) {
972 /* bitstream info header */
973 2 frame_bits += 35;
974 2 frame_bits += 1 + 1;
975
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 2 if (s->num_blocks != 0x6)
976 ✗ frame_bits++;
977 2 frame_bits++;
978 /* audio frame header */
979
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 2 if (s->num_blocks == 6)
980 2 frame_bits += 2;
981 2 frame_bits += 10;
982 /* exponent strategy */
983
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 2 if (s->use_frame_exp_strategy)
984 ✗ frame_bits += 5 * s->fbw_channels;
985 else
986 2 frame_bits += s->num_blocks * 2 * s->fbw_channels;
987
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 2 if (s->lfe_on)
988 ✗ frame_bits += s->num_blocks;
989 /* converter exponent strategy */
990
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 2 if (s->num_blks_code != 0x3)
991 ✗ frame_bits++;
992 else
993 2 frame_bits += s->fbw_channels * 5;
994 /* snr offsets */
995 2 frame_bits += 10;
996 /* block start info */
997
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 2 if (s->num_blocks != 1)
998 2 frame_bits++;
999 } else {
1000 14 frame_bits += 49;
1001 14 frame_bits += frame_bits_inc[s->channel_mode];
1002 }
1003
1004 /* audio blocks */
1005
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 112 for (blk = 0; blk < s->num_blocks; blk++) {
1006
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 96 if (!s->eac3) {
1007 /* block switch flags */
1008 84 frame_bits += s->fbw_channels;
1009
1010 /* dither flags */
1011 84 frame_bits += s->fbw_channels;
1012 }
1013
1014 /* dynamic range */
1015 96 frame_bits++;
1016
1017 /* spectral extension */
1018
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 96 if (s->eac3)
1019 12 frame_bits++;
1020
1021 /* coupling strategy exists: cplstre */
1022
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 96 if (!s->eac3)
1023 84 frame_bits++;
1024
1025
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 96 if (!s->eac3) {
1026 /* exponent strategy */
1027 84 frame_bits += 2 * s->fbw_channels;
1028
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 84 if (s->lfe_on)
1029 12 frame_bits++;
1030
1031 /* bit allocation params */
1032 84 frame_bits++;
1033
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 84 if (!blk)
1034 14 frame_bits += 2 + 2 + 2 + 2 + 3;
1035 }
1036
1037 /* snroffste for AC-3, convsnroffste for E-AC-3 */
1038 96 frame_bits++;
1039
1040
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 96 if (!s->eac3) {
1041 /* delta bit allocation */
1042 84 frame_bits++;
1043
1044 /* skipped data */
1045 84 frame_bits++;
1046 }
1047 }
1048
1049 /* auxiliary data */
1050 16 frame_bits++;
1051
1052 /* CRC */
1053 16 frame_bits += 1 + 16;
1054
1055 16 s->frame_bits_fixed = frame_bits;
1056 16 }
1057
1058
1059 /*
1060 * Initialize bit allocation.
1061 * Set default parameter codes and calculate parameter values.
1062 */
1063 16 static av_cold void bit_alloc_init(AC3EncodeContext *s)
1064 {
1065 int ch;
1066
1067 /* init default parameters */
1068 16 s->slow_decay_code = 2;
1069 16 s->fast_decay_code = 1;
1070 16 s->slow_gain_code = 1;
1071
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 16 s->db_per_bit_code = s->eac3 ? 2 : 3;
1072 16 s->floor_code = 7;
1073
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 66 for (ch = 0; ch <= s->channels; ch++)
1074 50 s->fast_gain_code[ch] = 4;
1075
1076 /* initial snr offset */
1077 16 s->coarse_snr_offset = 40;
1078
1079 /* compute real values */
1080 /* currently none of these values change during encoding, so we can just
1081 set them once at initialization */
1082 16 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code];
1083 16 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code];
1084 16 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
1085 16 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
1086 16 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
1087 16 s->bit_alloc.cpl_fast_leak = 0;
1088 16 s->bit_alloc.cpl_slow_leak = 0;
1089
1090 16 count_frame_bits_fixed(s);
1091 16 }
1092
1093
1094 /*
1095 * Count the bits used to encode the frame, minus exponents and mantissas.
1096 * Bits based on fixed parameters have already been counted, so now we just
1097 * have to add the bits based on parameters that change during encoding.
1098 */
1099 1449 static void count_frame_bits(AC3EncodeContext *s)
1100 {
1101 1449 AC3EncOptions *opt = &s->options;
1102 int blk, ch;
1103 1449 int frame_bits = 0;
1104
1105 /* header */
1106
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 1449 if (s->eac3) {
1107
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 305 if (opt->eac3_mixing_metadata) {
1108 ✗ if (s->channel_mode > AC3_CHMODE_STEREO)
1109 ✗ frame_bits += 2;
1110 ✗ if (s->has_center)
1111 ✗ frame_bits += 6;
1112 ✗ if (s->has_surround)
1113 ✗ frame_bits += 6;
1114 ✗ frame_bits += s->lfe_on;
1115 ✗ frame_bits += 1 + 1 + 2;
1116 ✗ if (s->channel_mode < AC3_CHMODE_STEREO)
1117 ✗ frame_bits++;
1118 ✗ frame_bits++;
1119 }
1120
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 305 if (opt->eac3_info_metadata) {
1121 ✗ frame_bits += 3 + 1 + 1;
1122 ✗ if (s->channel_mode == AC3_CHMODE_STEREO)
1123 ✗ frame_bits += 2 + 2;
1124 ✗ if (s->channel_mode >= AC3_CHMODE_2F2R)
1125 ✗ frame_bits += 2;
1126 ✗ frame_bits++;
1127 ✗ if (opt->audio_production_info)
1128 ✗ frame_bits += 5 + 2 + 1;
1129 ✗ frame_bits++;
1130 }
1131 /* coupling */
1132
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 305 if (s->channel_mode > AC3_CHMODE_MONO) {
1133 305 frame_bits++;
1134
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 1830 for (blk = 1; blk < s->num_blocks; blk++) {
1135 1525 AC3Block *block = &s->blocks[blk];
1136 1525 frame_bits++;
1137
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 1525 if (block->new_cpl_strategy)
1138 ✗ frame_bits++;
1139 }
1140 }
1141 /* coupling exponent strategy */
1142
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 305 if (s->cpl_on) {
1143
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 305 if (s->use_frame_exp_strategy) {
1144 305 frame_bits += 5;
1145 } else {
1146 ✗ for (blk = 0; blk < s->num_blocks; blk++)
1147 ✗ frame_bits += 2 * s->blocks[blk].cpl_in_use;
1148 }
1149 }
1150 } else {
1151
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 1144 if (opt->audio_production_info)
1152 ✗ frame_bits += 7;
1153
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 1144 if (s->bitstream_id == 6) {
1154 ✗ if (opt->extended_bsi_1)
1155 ✗ frame_bits += 14;
1156 ✗ if (opt->extended_bsi_2)
1157 ✗ frame_bits += 14;
1158 }
1159 }
1160
1161 /* audio blocks */
1162
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
1163 8694 AC3Block *block = &s->blocks[blk];
1164
1165 /* coupling strategy */
1166
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 8694 if (block->new_cpl_strategy) {
1167
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 1449 if (!s->eac3)
1168 1144 frame_bits++;
1169
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 1449 if (block->cpl_in_use) {
1170
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 862 if (s->eac3)
1171 305 frame_bits++;
1172
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 862 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
1173 557 frame_bits += s->fbw_channels;
1174
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 862 if (s->channel_mode == AC3_CHMODE_STEREO)
1175 844 frame_bits++;
1176 862 frame_bits += 4 + 4;
1177
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 862 if (s->eac3)
1178 305 frame_bits++;
1179 else
1180 557 frame_bits += s->num_cpl_subbands - 1;
1181 }
1182 }
1183
1184 /* coupling coordinates */
1185
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 8694 if (block->cpl_in_use) {
1186 5172 int cpl_coords_exist = 0;
1187
1188
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 15840 for (ch = 1; ch <= s->fbw_channels; ch++) {
1189
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 10668 if (block->channel_in_cpl[ch]) {
1190
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 10668 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1191 10058 frame_bits++;
1192
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 10668 if (block->new_cpl_coords[ch]) {
1193 1826 cpl_coords_exist = 1;
1194 1826 frame_bits += 2;
1195 1826 frame_bits += (4 + 4) * s->num_cpl_bands;
1196 }
1197 }
1198 }
1199
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 5172 if (s->channel_mode == AC3_CHMODE_STEREO &&
1200
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 5064 s->phase_flags_in_use && cpl_coords_exist)
1201 93 frame_bits += s->num_cpl_bands;
1202 }
1203
1204 /* stereo rematrixing */
1205
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 8694 if (s->channel_mode == AC3_CHMODE_STEREO) {
1206
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 6102 if (!s->eac3 || blk > 0)
1207 5797 frame_bits++;
1208
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 6102 if (s->blocks[blk].new_rematrixing_strategy)
1209 2498 frame_bits += block->num_rematrixing_bands;
1210 }
1211
1212 /* bandwidth codes & gain range */
1213
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 23922 for (ch = 1; ch <= s->fbw_channels; ch++) {
1214
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 15228 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1215
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 2890 if (!block->channel_in_cpl[ch])
1216 975 frame_bits += 6;
1217 2890 frame_bits += 2;
1218 }
1219 }
1220
1221 /* coupling exponent strategy */
1222
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 8694 if (!s->eac3 && block->cpl_in_use)
1223 3342 frame_bits += 2;
1224
1225 /* snr offsets and fast gain codes */
1226
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 8694 if (!s->eac3) {
1227
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 6864 if (block->new_snr_offsets)
1228 1144 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
1229 }
1230
1231 /* coupling leak info */
1232
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 8694 if (block->cpl_in_use) {
1233
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 5172 if (!s->eac3 || block->new_cpl_leak != 2)
1234 4867 frame_bits++;
1235
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 5172 if (block->new_cpl_leak)
1236 862 frame_bits += 3 + 3;
1237 }
1238 }
1239
1240 1449 s->frame_bits = s->frame_bits_fixed + frame_bits;
1241 1449 }
1242
1243
1244 /*
1245 * Calculate masking curve based on the final exponents.
1246 * Also calculate the power spectral densities to use in future calculations.
1247 */
1248 1449 static void bit_alloc_masking(AC3EncodeContext *s)
1249 {
1250 int blk, ch;
1251
1252
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
1253 8694 AC3Block *block = &s->blocks[blk];
1254
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 29202 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1255 /* We only need psd and mask for calculating bap.
1256 Since we currently do not calculate bap when exponent
1257 strategy is EXP_REUSE we do not need to calculate psd or mask. */
1258
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 20508 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1259 4537 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
1260 block->end_freq[ch], block->psd[ch],
1261 block->band_psd[ch]);
1262 4537 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
1263 s->start_freq[ch], block->end_freq[ch],
1264 4537 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
1265 4537 ch == s->lfe_channel,
1266 DBA_NONE, 0, NULL, NULL, NULL,
1267 block->mask[ch]);
1268 }
1269 }
1270 }
1271 1449 }
1272
1273
1274 /*
1275 * Ensure that bap for each block and channel point to the current bap_buffer.
1276 * They may have been switched during the bit allocation search.
1277 */
1278 13559 static void reset_block_bap(AC3EncodeContext *s)
1279 {
1280 int blk, ch;
1281 uint8_t *ref_bap;
1282
1283
4/4
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 13559 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
1284 4681 return;
1285
1286 8878 ref_bap = s->bap_buffer;
1287
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 33277 for (ch = 0; ch <= s->channels; ch++) {
1288
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 170793 for (blk = 0; blk < s->num_blocks; blk++)
1289 146394 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
1290 24399 ref_bap += AC3_MAX_COEFS * s->num_blocks;
1291 }
1292 8878 s->ref_bap_set = 1;
1293 }
1294
1295
1296 /**
1297 * Initialize mantissa counts.
1298 * These are set so that they are padded to the next whole group size when bits
1299 * are counted in compute_mantissa_size.
1300 *
1301 * @param[in,out] mant_cnt running counts for each bap value for each block
1302 */
1303 12110 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
1304 {
1305 int blk;
1306
1307
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 84770 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
1308 72660 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
1309 72660 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
1310 72660 mant_cnt[blk][4] = 1;
1311 }
1312 12110 }
1313
1314
1315 /**
1316 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
1317 * range.
1318 *
1319 * @param s AC-3 encoder private context
1320 * @param ch channel index
1321 * @param[in,out] mant_cnt running counts for each bap value for each block
1322 * @param start starting coefficient bin
1323 * @param end ending coefficient bin
1324 */
1325 28250 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
1326 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
1327 int start, int end)
1328 {
1329 int blk;
1330
1331
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 197750 for (blk = 0; blk < s->num_blocks; blk++) {
1332 169500 AC3Block *block = &s->blocks[blk];
1333
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 169500 if (ch == CPL_CH && !block->cpl_in_use)
1334 ✗ continue;
1335 169500 s->ac3dsp.update_bap_counts(mant_cnt[blk],
1336 169500 s->ref_bap[ch][blk] + start,
1337 169500 FFMIN(end, block->end_freq[ch]) - start);
1338 }
1339 28250 }
1340
1341
1342 /*
1343 * Count the number of mantissa bits in the frame based on the bap values.
1344 */
1345 12110 static int count_mantissa_bits(AC3EncodeContext *s)
1346 {
1347 int ch, max_end_freq;
1348 12110 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
1349
1350 12110 count_mantissa_bits_init(mant_cnt);
1351
1352 12110 max_end_freq = s->bandwidth_code * 3 + 73;
1353
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 40360 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
1354 28250 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
1355 max_end_freq);
1356
1357 12110 return s->ac3dsp.compute_mantissa_size(mant_cnt);
1358 }
1359
1360
1361 /**
1362 * Run the bit allocation with a given SNR offset.
1363 * This calculates the bit allocation pointers that will be used to determine
1364 * the quantization of each mantissa.
1365 *
1366 * @param s AC-3 encoder private context
1367 * @param snr_offset SNR offset, 0 to 1023
1368 * @return the number of bits needed for mantissas if the given SNR offset is
1369 * is used.
1370 */
1371 12110 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
1372 {
1373 int blk, ch;
1374
1375 12110 snr_offset = (snr_offset - 240) * 4;
1376
1377 12110 reset_block_bap(s);
1378
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 84770 for (blk = 0; blk < s->num_blocks; blk++) {
1379 72660 AC3Block *block = &s->blocks[blk];
1380
1381
2/2
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 242160 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1382 /* Currently the only bit allocation parameters which vary across
1383 blocks within a frame are the exponent values. We can take
1384 advantage of that by reusing the bit allocation pointers
1385 whenever we reuse exponents. */
1386
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 169500 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
1387 38215 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
1388 s->start_freq[ch], block->end_freq[ch],
1389 snr_offset, s->bit_alloc.floor,
1390 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
1391 }
1392 }
1393 }
1394 12110 return count_mantissa_bits(s);
1395 }
1396
1397
1398 /*
1399 * Constant bitrate bit allocation search.
1400 * Find the largest SNR offset that will allow data to fit in the frame.
1401 */
1402 1449 static int cbr_bit_allocation(AC3EncodeContext *s)
1403 {
1404 int ch;
1405 int bits_left;
1406 int snr_offset, snr_incr;
1407
1408 1449 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
1409
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 1449 if (bits_left < 0)
1410 ✗ return AVERROR(EINVAL);
1411
1412 1449 snr_offset = s->coarse_snr_offset << 4;
1413
1414 /* if previous frame SNR offset was 1023, check if current frame can also
1415 use SNR offset of 1023. if so, skip the search. */
1416
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 1449 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
1417 ✗ if (bit_alloc(s, 1023) <= bits_left)
1418 ✗ return 0;
1419 }
1420
1421
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 3566 while (snr_offset >= 0 &&
1422 1783 bit_alloc(s, snr_offset) > bits_left) {
1423 334 snr_offset -= 64;
1424 }
1425
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 1449 if (snr_offset < 0)
1426 ✗ return AVERROR(EINVAL);
1427
1428 1449 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1429
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 7245 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
1430
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 20654 while (snr_offset + snr_incr <= 1023 &&
1431 10327 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
1432 4531 snr_offset += snr_incr;
1433 4531 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1434 }
1435 }
1436 1449 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
1437 1449 reset_block_bap(s);
1438
1439 1449 s->coarse_snr_offset = snr_offset >> 4;
1440
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 4867 for (ch = !s->cpl_on; ch <= s->channels; ch++)
1441 3418 s->fine_snr_offset[ch] = snr_offset & 0xF;
1442
1443 1449 return 0;
1444 }
1445
1446
1447 /*
1448 * Perform bit allocation search.
1449 * Finds the SNR offset value that maximizes quality and fits in the specified
1450 * frame size. Output is the SNR offset and a set of bit allocation pointers
1451 * used to quantize the mantissas.
1452 */
1453 1449 static int ac3_compute_bit_allocation(AC3EncodeContext *s)
1454 {
1455 1449 count_frame_bits(s);
1456
1457 1449 s->exponent_bits = count_exponent_bits(s);
1458
1459 1449 bit_alloc_masking(s);
1460
1461 1449 return cbr_bit_allocation(s);
1462 }
1463
1464
1465 /**
1466 * Symmetric quantization on 'levels' levels.
1467 *
1468 * @param c unquantized coefficient
1469 * @param e exponent
1470 * @param levels number of quantization levels
1471 * @return quantized coefficient
1472 */
1473 1291642 static inline int sym_quant(int c, int e, int levels)
1474 {
1475 1291642 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
1476 av_assert2(v >= 0 && v < levels);
1477 1291642 return v;
1478 }
1479
1480
1481 /**
1482 * Asymmetric quantization on 2^qbits levels.
1483 *
1484 * @param c unquantized coefficient
1485 * @param e exponent
1486 * @param qbits number of quantization bits
1487 * @return quantized coefficient
1488 */
1489 238097 static inline int asym_quant(int c, int e, int qbits)
1490 {
1491 int m;
1492
1493 238097 c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
1494 238097 m = (1 << (qbits-1));
1495
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 238097 if (c >= m)
1496 184 c = m - 1;
1497 av_assert2(c >= -m);
1498 238097 return c;
1499 }
1500
1501
1502 /**
1503 * Quantize a set of mantissas for a single channel in a single block.
1504 *
1505 * @param s Mantissa count context
1506 * @param fixed_coef unquantized fixed-point coefficients
1507 * @param exp exponents
1508 * @param bap bit allocation pointer indices
1509 * @param[out] qmant quantized coefficients
1510 * @param start_freq starting coefficient bin
1511 * @param end_freq ending coefficient bin
1512 */
1513 20508 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
1514 uint8_t *exp, uint8_t *bap,
1515 int16_t *qmant, int start_freq,
1516 int end_freq)
1517 {
1518 int i;
1519
1520
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 2440932 for (i = start_freq; i < end_freq; i++) {
1521 2420424 int c = fixed_coef[i];
1522 2420424 int e = exp[i];
1523 2420424 int v = bap[i];
1524
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 2420424 switch (v) {
1525 890685 case 0:
1526 890685 break;
1527 655556 case 1:
1528 655556 v = sym_quant(c, e, 3);
1529
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 655556 switch (s->mant1_cnt) {
1530 221068 case 0:
1531 221068 s->qmant1_ptr = &qmant[i];
1532 221068 v = 9 * v;
1533 221068 s->mant1_cnt = 1;
1534 221068 break;
1535 218792 case 1:
1536 218792 *s->qmant1_ptr += 3 * v;
1537 218792 s->mant1_cnt = 2;
1538 218792 v = 128;
1539 218792 break;
1540 215696 default:
1541 215696 *s->qmant1_ptr += v;
1542 215696 s->mant1_cnt = 0;
1543 215696 v = 128;
1544 215696 break;
1545 }
1546 655556 break;
1547 221318 case 2:
1548 221318 v = sym_quant(c, e, 5);
1549
3/3
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 221318 switch (s->mant2_cnt) {
1550 76385 case 0:
1551 76385 s->qmant2_ptr = &qmant[i];
1552 76385 v = 25 * v;
1553 76385 s->mant2_cnt = 1;
1554 76385 break;
1555 73876 case 1:
1556 73876 *s->qmant2_ptr += 5 * v;
1557 73876 s->mant2_cnt = 2;
1558 73876 v = 128;
1559 73876 break;
1560 71057 default:
1561 71057 *s->qmant2_ptr += v;
1562 71057 s->mant2_cnt = 0;
1563 71057 v = 128;
1564 71057 break;
1565 }
1566 221318 break;
1567 241230 case 3:
1568 241230 v = sym_quant(c, e, 7);
1569 241230 break;
1570 100138 case 4:
1571 100138 v = sym_quant(c, e, 11);
1572
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 100138 switch (s->mant4_cnt) {
1573 51446 case 0:
1574 51446 s->qmant4_ptr = &qmant[i];
1575 51446 v = 11 * v;
1576 51446 s->mant4_cnt = 1;
1577 51446 break;
1578 48692 default:
1579 48692 *s->qmant4_ptr += v;
1580 48692 s->mant4_cnt = 0;
1581 48692 v = 128;
1582 48692 break;
1583 }
1584 100138 break;
1585 73400 case 5:
1586 73400 v = sym_quant(c, e, 15);
1587 73400 break;
1588 20699 case 14:
1589 20699 v = asym_quant(c, e, 14);
1590 20699 break;
1591 13386 case 15:
1592 13386 v = asym_quant(c, e, 16);
1593 13386 break;
1594 204012 default:
1595 204012 v = asym_quant(c, e, v - 1);
1596 204012 break;
1597 }
1598 2420424 qmant[i] = v;
1599 }
1600 20508 }
1601
1602
1603 /**
1604 * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
1605 *
1606 * @param s AC-3 encoder private context
1607 */
1608 1449 static void ac3_quantize_mantissas(AC3EncodeContext *s)
1609 {
1610 1449 int blk, ch, ch0=0, got_cpl;
1611
1612
2/2
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 10143 for (blk = 0; blk < s->num_blocks; blk++) {
1613 8694 AC3Block *block = &s->blocks[blk];
1614 8694 AC3Mant m = { 0 };
1615
1616 8694 got_cpl = !block->cpl_in_use;
1617
2/2
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 29202 for (ch = 1; ch <= s->channels; ch++) {
1618
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 20508 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1619 5172 ch0 = ch - 1;
1620 5172 ch = CPL_CH;
1621 5172 got_cpl = 1;
1622 }
1623 20508 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
1624 20508 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
1625 20508 s->ref_bap[ch][blk], block->qmant[ch],
1626 s->start_freq[ch], block->end_freq[ch]);
1627
2/2
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 20508 if (ch == CPL_CH)
1628 5172 ch = ch0;
1629 }
1630 }
1631 1449 }
1632
1633
1634 /*
1635 * Write the AC-3 frame header to the output bitstream.
1636 */
1637 1144 static void ac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb)
1638 {
1639 1144 AC3EncOptions *opt = &s->options;
1640
1641 1144 put_bits_assume_flushed(pb);
1642
1643 1144 put_bits(pb, 16, 0x0b77); /* frame header */
1644 1144 put_bits(pb, 16, 0); /* crc1: will be filled later */
1645 1144 put_bits(pb, 2, s->bit_alloc.sr_code);
1646 1144 put_bits(pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
1647 1144 put_bits(pb, 5, s->bitstream_id);
1648 1144 put_bits(pb, 3, s->bitstream_mode);
1649 1144 put_bits(pb, 3, s->channel_mode);
1650
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 1144 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
1651 18 put_bits(pb, 2, s->center_mix_level);
1652
2/2
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 1144 if (s->channel_mode & 0x04)
1653 18 put_bits(pb, 2, s->surround_mix_level);
1654
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 1144 if (s->channel_mode == AC3_CHMODE_STEREO)
1655 712 put_bits(pb, 2, opt->dolby_surround_mode);
1656 1144 put_bits(pb, 1, s->lfe_on); /* LFE */
1657 1144 put_bits(pb, 5, -opt->dialogue_level);
1658 1144 put_bits(pb, 1, 0); /* no compression control word */
1659 1144 put_bits(pb, 1, 0); /* no lang code */
1660 1144 put_bits(pb, 1, opt->audio_production_info);
1661
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 1144 if (opt->audio_production_info) {
1662 ✗ put_bits(pb, 5, opt->mixing_level - 80);
1663 ✗ put_bits(pb, 2, opt->room_type);
1664 }
1665 1144 put_bits(pb, 1, opt->copyright);
1666 1144 put_bits(pb, 1, opt->original);
1667
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 1144 if (s->bitstream_id == 6) {
1668 /* alternate bit stream syntax */
1669 ✗ put_bits(pb, 1, opt->extended_bsi_1);
1670 ✗ if (opt->extended_bsi_1) {
1671 ✗ put_bits(pb, 2, opt->preferred_stereo_downmix);
1672 ✗ put_bits(pb, 3, s->ltrt_center_mix_level);
1673 ✗ put_bits(pb, 3, s->ltrt_surround_mix_level);
1674 ✗ put_bits(pb, 3, s->loro_center_mix_level);
1675 ✗ put_bits(pb, 3, s->loro_surround_mix_level);
1676 }
1677 ✗ put_bits(pb, 1, opt->extended_bsi_2);
1678 ✗ if (opt->extended_bsi_2) {
1679 ✗ put_bits(pb, 2, opt->dolby_surround_ex_mode);
1680 ✗ put_bits(pb, 2, opt->dolby_headphone_mode);
1681 ✗ put_bits(pb, 1, opt->ad_converter_type);
1682 ✗ put_bits(pb, 9, 0); /* xbsi2 and encinfo : reserved */
1683 }
1684 } else {
1685 1144 put_bits(pb, 1, 0); /* no time code 1 */
1686 1144 put_bits(pb, 1, 0); /* no time code 2 */
1687 }
1688 1144 put_bits(pb, 1, 0); /* no additional bit stream info */
1689 1144 }
1690
1691
1692 /*
1693 * Write one audio block to the output bitstream.
1694 */
1695 8694 static void output_audio_block(AC3EncodeContext *s, PutBitContext *pb, int blk)
1696 {
1697 8694 int ch, i, baie, bnd, got_cpl, av_uninit(ch0);
1698 8694 AC3Block *block = &s->blocks[blk];
1699
1700 /* block switching */
1701
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 8694 if (!s->eac3) {
1702
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 18432 for (ch = 0; ch < s->fbw_channels; ch++)
1703 11568 put_bits(pb, 1, 0);
1704 }
1705
1706 /* dither flags */
1707
2/2
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 8694 if (!s->eac3) {
1708
2/2
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 18432 for (ch = 0; ch < s->fbw_channels; ch++)
1709 11568 put_bits(pb, 1, 1);
1710 }
1711
1712 /* dynamic range codes */
1713 8694 put_bits(pb, 1, 0);
1714
1715 /* spectral extension */
1716
2/2
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 8694 if (s->eac3)
1717 1830 put_bits(pb, 1, 0);
1718
1719 /* channel coupling */
1720
2/2
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 8694 if (!s->eac3)
1721 6864 put_bits(pb, 1, block->new_cpl_strategy);
1722
2/2
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 8694 if (block->new_cpl_strategy) {
1723
2/2
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✓ Branch 1 taken 305 times.
 1449 if (!s->eac3)
1724 1144 put_bits(pb, 1, block->cpl_in_use);
1725
2/2
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 1449 if (block->cpl_in_use) {
1726 int start_sub, end_sub;
1727
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 862 if (s->eac3)
1728 305 put_bits(pb, 1, 0); /* enhanced coupling */
1729
3/4
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✗ Branch 2 not taken.
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 862 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
1730
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 1725 for (ch = 1; ch <= s->fbw_channels; ch++)
1731 1168 put_bits(pb, 1, block->channel_in_cpl[ch]);
1732 }
1733
2/2
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 862 if (s->channel_mode == AC3_CHMODE_STEREO)
1734 844 put_bits(pb, 1, s->phase_flags_in_use);
1735 862 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
1736 862 end_sub = (s->cpl_end_freq - 37) / 12;
1737 862 put_bits(pb, 4, start_sub);
1738 862 put_bits(pb, 4, end_sub - 3);
1739 /* coupling band structure */
1740
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 862 if (s->eac3) {
1741 305 put_bits(pb, 1, 0); /* use default */
1742 } else {
1743
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 2999 for (bnd = start_sub+1; bnd < end_sub; bnd++)
1744 2442 put_bits(pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
1745 }
1746 }
1747 }
1748
1749 /* coupling coordinates */
1750
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 8694 if (block->cpl_in_use) {
1751 5172 int cpl_coords_exist = 0;
1752
1753
2/2
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 15840 for (ch = 1; ch <= s->fbw_channels; ch++) {
1754
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 10668 if (block->channel_in_cpl[ch]) {
1755
4/4
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✓ Branch 3 taken 610 times.
 10668 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
1756 10058 put_bits(pb, 1, block->new_cpl_coords[ch]);
1757
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 10668 if (block->new_cpl_coords[ch]) {
1758 1826 cpl_coords_exist = 1;
1759 1826 put_bits(pb, 2, block->cpl_master_exp[ch]);
1760
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 9378 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
1761 7552 put_bits(pb, 4, block->cpl_coord_exp [ch][bnd]);
1762 7552 put_bits(pb, 4, block->cpl_coord_mant[ch][bnd]);
1763 }
1764 }
1765 }
1766 }
1767
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 5172 if (s->channel_mode == AC3_CHMODE_STEREO &&
1768
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✓ Branch 3 taken 465 times.
 5064 s->phase_flags_in_use && cpl_coords_exist) {
1769
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 744 for (bnd = 0; bnd < s->num_cpl_bands; bnd++)
1770 651 put_bits(pb, 1, s->phase_flags[bnd]);
1771 }
1772 }
1773
1774 /* stereo rematrixing */
1775
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 8694 if (s->channel_mode == AC3_CHMODE_STEREO) {
1776
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 6102 if (!s->eac3 || blk > 0)
1777 5797 put_bits(pb, 1, block->new_rematrixing_strategy);
1778
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 6102 if (block->new_rematrixing_strategy) {
1779 /* rematrixing flags */
1780
2/2
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 12391 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
1781 9893 put_bits(pb, 1, block->rematrixing_flags[bnd]);
1782 }
1783 }
1784
1785 /* exponent strategy */
1786
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 8694 if (!s->eac3) {
1787
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 21774 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
1788 14910 put_bits(pb, 2, s->exp_strategy[ch][blk]);
1789
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 6864 if (s->lfe_on)
1790 108 put_bits(pb, 1, s->exp_strategy[s->lfe_channel][blk]);
1791 }
1792
1793 /* bandwidth */
1794
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 23922 for (ch = 1; ch <= s->fbw_channels; ch++) {
1795
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✓ Branch 3 taken 1915 times.
 15228 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
1796 975 put_bits(pb, 6, s->bandwidth_code);
1797 }
1798
1799 /* exponents */
1800
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 29202 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1801 int nb_groups;
1802 20508 int cpl = (ch == CPL_CH);
1803
1804
2/2
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 20508 if (s->exp_strategy[ch][blk] == EXP_REUSE)
1805 15971 continue;
1806
1807 /* DC exponent */
1808 4537 put_bits(pb, 4, block->grouped_exp[ch][0] >> cpl);
1809
1810 /* exponent groups */
1811 4537 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
1812
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 145108 for (i = 1; i <= nb_groups; i++)
1813 140571 put_bits(pb, 7, block->grouped_exp[ch][i]);
1814
1815 /* gain range info */
1816
4/4
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 4537 if (ch != s->lfe_channel && !cpl)
1817 2890 put_bits(pb, 2, 0);
1818 }
1819
1820 /* bit allocation info */
1821
2/2
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 8694 if (!s->eac3) {
1822 6864 baie = (blk == 0);
1823 6864 put_bits(pb, 1, baie);
1824
2/2
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 6864 if (baie) {
1825 1144 put_bits(pb, 2, s->slow_decay_code);
1826 1144 put_bits(pb, 2, s->fast_decay_code);
1827 1144 put_bits(pb, 2, s->slow_gain_code);
1828 1144 put_bits(pb, 2, s->db_per_bit_code);
1829 1144 put_bits(pb, 3, s->floor_code);
1830 }
1831 }
1832
1833 /* snr offset */
1834
2/2
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 8694 if (!s->eac3) {
1835 6864 put_bits(pb, 1, block->new_snr_offsets);
1836
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 6864 if (block->new_snr_offsets) {
1837 1144 put_bits(pb, 6, s->coarse_snr_offset);
1838
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 3647 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
1839 2503 put_bits(pb, 4, s->fine_snr_offset[ch]);
1840 2503 put_bits(pb, 3, s->fast_gain_code[ch]);
1841 }
1842 }
1843 } else {
1844 1830 put_bits(pb, 1, 0); /* no converter snr offset */
1845 }
1846
1847 /* coupling leak */
1848
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 8694 if (block->cpl_in_use) {
1849
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 5172 if (!s->eac3 || block->new_cpl_leak != 2)
1850 4867 put_bits(pb, 1, block->new_cpl_leak);
1851
2/2
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 5172 if (block->new_cpl_leak) {
1852 862 put_bits(pb, 3, s->bit_alloc.cpl_fast_leak);
1853 862 put_bits(pb, 3, s->bit_alloc.cpl_slow_leak);
1854 }
1855 }
1856
1857
2/2
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 8694 if (!s->eac3) {
1858 6864 put_bits(pb, 1, 0); /* no delta bit allocation */
1859 6864 put_bits(pb, 1, 0); /* no data to skip */
1860 }
1861
1862 /* mantissas */
1863 8694 got_cpl = !block->cpl_in_use;
1864
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 29202 for (ch = 1; ch <= s->channels; ch++) {
1865 int b, q;
1866
1867
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 20508 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
1868 5172 ch0 = ch - 1;
1869 5172 ch = CPL_CH;
1870 5172 got_cpl = 1;
1871 }
1872
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 2440932 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
1873 2420424 q = block->qmant[ch][i];
1874 2420424 b = s->ref_bap[ch][blk][i];
1875
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 2420424 switch (b) {
1876 890685 case 0: break;
1877
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 655556 case 1: if (q != 128) put_bits (pb, 5, q); break;
1878
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 221318 case 2: if (q != 128) put_bits (pb, 7, q); break;
1879 241230 case 3: put_sbits(pb, 3, q); break;
1880
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 100138 case 4: if (q != 128) put_bits (pb, 7, q); break;
1881 20699 case 14: put_sbits(pb, 14, q); break;
1882 13386 case 15: put_sbits(pb, 16, q); break;
1883 277412 default: put_sbits(pb, b-1, q); break;
1884 }
1885 }
1886
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 20508 if (ch == CPL_CH)
1887 5172 ch = ch0;
1888 }
1889 8694 }
1890
1891
1892 /** CRC-16 Polynomial */
1893 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
1894
1895
1896 1600 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
1897 {
1898 unsigned int c;
1899
1900 1600 c = 0;
1901
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 25503 while (a) {
1902
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✓ Branch 1 taken 12243 times.
 23903 if (a & 1)
1903 11660 c ^= b;
1904 23903 a = a >> 1;
1905 23903 b = b << 1;
1906
2/2
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 23903 if (b & (1 << 16))
1907 11332 b ^= poly;
1908 }
1909 1600 return c;
1910 }
1911
1912
1913 29 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
1914 {
1915 unsigned int r;
1916 29 r = 1;
1917
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 383 while (n) {
1918
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 354 if (n & 1)
1919 102 r = mul_poly(r, a, poly);
1920 354 a = mul_poly(a, a, poly);
1921 354 n >>= 1;
1922 }
1923 29 return r;
1924 }
1925
1926
1927 /*
1928 * Fill the end of the frame with 0's and compute the two CRCs.
1929 */
1930 1449 static void output_frame_end(AC3EncodeContext *s, PutBitContext *pb)
1931 {
1932 1449 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
1933 int frame_size_58, pad_bytes, crc1, crc2, crc_inv;
1934 uint8_t *frame;
1935
1936 1449 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
1937
1938 /* pad the remainder of the frame with zeros */
1939 av_assert2(s->frame_size * 8 - put_bits_count(pb) >= 18);
1940 1449 flush_put_bits(pb);
1941 1449 frame = pb->buf;
1942 1449 pad_bytes = s->frame_size - (put_bits_ptr(pb) - frame) - 2;
1943 av_assert2(pad_bytes >= 0);
1944
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 1449 if (pad_bytes > 0)
1945 1289 memset(put_bits_ptr(pb), 0, pad_bytes);
1946
1947
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 1449 if (s->eac3) {
1948 /* compute crc2 */
1949 305 crc2 = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 4);
1950 } else {
1951 /* compute crc1 */
1952 /* this is not so easy because it is at the beginning of the data... */
1953 1144 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
1954 1144 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
1955 1144 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
1956 1144 AV_WB16(frame + 2, crc1);
1957
1958 /* compute crc2 */
1959 1144 crc2 = av_crc(crc_ctx, 0, frame + frame_size_58,
1960 1144 s->frame_size - frame_size_58 - 2);
1961 }
1962 1449 crc2 = av_bswap16(crc2);
1963 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
1964
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 1449 if (crc2 == 0x0B77) {
1965 /* The CRC generator polynomial is x^16 + x^15 + x^2 + 1,
1966 * so xor'ing with 0x18005 does not affect the CRC. */
1967 ✗ frame[s->frame_size - 3] ^= 0x1;
1968 ✗ crc2 ^= 0x8005;
1969 }
1970 1449 AV_WB16(frame + s->frame_size - 2, crc2);
1971 1449 }
1972
1973
1974 /**
1975 * Write the frame to the output bitstream.
1976 *
1977 * @param s AC-3 encoder private context
1978 * @param frame output data buffer
1979 */
1980 1449 static void ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
1981 {
1982 PutBitContext pb;
1983 int blk;
1984
1985 1449 init_put_bits(&pb, frame, s->frame_size);
1986
1987 1449 s->output_frame_header(s, &pb);
1988
1989
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 10143 for (blk = 0; blk < s->num_blocks; blk++)
1990 8694 output_audio_block(s, &pb, blk);
1991
1992 1449 output_frame_end(s, &pb);
1993 1449 }
1994
1995 1465 int ff_ac3_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1996 const AVFrame *frame, int *got_packet_ptr)
1997 {
1998 1465 AC3EncodeContext *const s = avctx->priv_data;
1999 int ret;
2000
2001 /* add current frame to queue */
2002
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 1465 if (frame) {
2003 1446 ret = ff_af_queue_add(&s->afq, frame);
2004
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 1446 if (ret < 0)
2005 ✗ return ret;
2006 } else {
2007
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 19 if (!s->afq.remaining_samples || (!s->afq.frame_alloc && !s->afq.frame_count))
2008 16 return 0;
2009 }
2010
2011
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 1449 if (s->options.allow_per_frame_metadata) {
2012 ✗ ret = ac3_validate_metadata(s);
2013 ✗ if (ret)
2014 ✗ return ret;
2015 }
2016
2017
4/4
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✓ Branch 3 taken 64 times.
 1449 if (s->bit_alloc.sr_code == 1 || s->eac3)
2018 1385 ac3_adjust_frame_size(s);
2019
2020 1449 s->encode_frame(s, frame);
2021
2022 1449 ac3_apply_rematrixing(s);
2023
2024 1449 ac3_process_exponents(s);
2025
2026 1449 ret = ac3_compute_bit_allocation(s);
2027
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 1449 if (ret) {
2028 ✗ av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
2029 ✗ return ret;
2030 }
2031
2032 1449 ac3_group_exponents(s);
2033
2034 1449 ac3_quantize_mantissas(s);
2035
2036 1449 ret = ff_get_encode_buffer(avctx, avpkt, s->frame_size, 0);
2037
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 1449 if (ret < 0)
2038 ✗ return ret;
2039 1449 ac3_output_frame(s, avpkt->data);
2040
2041 1449 ret = ff_af_queue_remove(&s->afq, avctx->frame_size, avpkt);
2042
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 1449 if (ret < 0)
2043 ✗ return ret;
2044
2045 1449 *got_packet_ptr = 1;
2046 1449 return 0;
2047 }
2048
2049 16 static void dprint_options(AC3EncodeContext *s)
2050 {
2051 #ifdef DEBUG
2052 AVCodecContext *avctx = s->avctx;
2053 AC3EncOptions *opt = &s->options;
2054 const char *msg;
2055 char strbuf[32];
2056
2057 switch (s->bitstream_id) {
2058 case 6: msg = "AC-3 (alt syntax)"; break;
2059 case 8: msg = "AC-3 (standard)"; break;
2060 case 16: msg = "E-AC-3 (enhanced)"; break;
2061 default: msg = "ERROR";
2062 }
2063 ff_dlog(avctx, "bitstream_id: %s (%d)\n", msg, s->bitstream_id);
2064 ff_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
2065 av_channel_layout_describe(&avctx->ch_layout, strbuf, sizeof(strbuf));
2066 ff_dlog(avctx, "channel_layout: %s\n", strbuf);
2067 ff_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
2068 ff_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
2069 ff_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
2070 if (s->cutoff)
2071 ff_dlog(avctx, "cutoff: %d\n", s->cutoff);
2072
2073 ff_dlog(avctx, "per_frame_metadata: %s\n",
2074 opt->allow_per_frame_metadata?"on":"off");
2075 if (s->has_center)
2076 ff_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
2077 s->center_mix_level);
2078 else
2079 ff_dlog(avctx, "center_mixlev: {not written}\n");
2080 if (s->has_surround)
2081 ff_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
2082 s->surround_mix_level);
2083 else
2084 ff_dlog(avctx, "surround_mixlev: {not written}\n");
2085 if (opt->audio_production_info) {
2086 ff_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
2087 switch (opt->room_type) {
2088 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2089 case AC3ENC_OPT_LARGE_ROOM: msg = "large"; break;
2090 case AC3ENC_OPT_SMALL_ROOM: msg = "small"; break;
2091 default:
2092 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->room_type);
2093 msg = strbuf;
2094 }
2095 ff_dlog(avctx, "room_type: %s\n", msg);
2096 } else {
2097 ff_dlog(avctx, "mixing_level: {not written}\n");
2098 ff_dlog(avctx, "room_type: {not written}\n");
2099 }
2100 ff_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
2101 ff_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
2102 if (s->channel_mode == AC3_CHMODE_STEREO) {
2103 switch (opt->dolby_surround_mode) {
2104 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2105 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2106 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2107 default:
2108 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_mode);
2109 msg = strbuf;
2110 }
2111 ff_dlog(avctx, "dsur_mode: %s\n", msg);
2112 } else {
2113 ff_dlog(avctx, "dsur_mode: {not written}\n");
2114 }
2115 ff_dlog(avctx, "original: %s\n", opt->original?"on":"off");
2116
2117 if (s->bitstream_id == 6) {
2118 if (opt->extended_bsi_1) {
2119 switch (opt->preferred_stereo_downmix) {
2120 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2121 case AC3ENC_OPT_DOWNMIX_LTRT: msg = "ltrt"; break;
2122 case AC3ENC_OPT_DOWNMIX_LORO: msg = "loro"; break;
2123 default:
2124 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->preferred_stereo_downmix);
2125 msg = strbuf;
2126 }
2127 ff_dlog(avctx, "dmix_mode: %s\n", msg);
2128 ff_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
2129 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
2130 ff_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
2131 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
2132 ff_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
2133 opt->loro_center_mix_level, s->loro_center_mix_level);
2134 ff_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
2135 opt->loro_surround_mix_level, s->loro_surround_mix_level);
2136 } else {
2137 ff_dlog(avctx, "extended bitstream info 1: {not written}\n");
2138 }
2139 if (opt->extended_bsi_2) {
2140 switch (opt->dolby_surround_ex_mode) {
2141 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2142 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2143 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2144 default:
2145 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_surround_ex_mode);
2146 msg = strbuf;
2147 }
2148 ff_dlog(avctx, "dsurex_mode: %s\n", msg);
2149 switch (opt->dolby_headphone_mode) {
2150 case AC3ENC_OPT_NOT_INDICATED: msg = "notindicated"; break;
2151 case AC3ENC_OPT_MODE_ON: msg = "on"; break;
2152 case AC3ENC_OPT_MODE_OFF: msg = "off"; break;
2153 default:
2154 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->dolby_headphone_mode);
2155 msg = strbuf;
2156 }
2157 ff_dlog(avctx, "dheadphone_mode: %s\n", msg);
2158
2159 switch (opt->ad_converter_type) {
2160 case AC3ENC_OPT_ADCONV_STANDARD: msg = "standard"; break;
2161 case AC3ENC_OPT_ADCONV_HDCD: msg = "hdcd"; break;
2162 default:
2163 snprintf(strbuf, sizeof(strbuf), "ERROR (%d)", opt->ad_converter_type);
2164 msg = strbuf;
2165 }
2166 ff_dlog(avctx, "ad_conv_type: %s\n", msg);
2167 } else {
2168 ff_dlog(avctx, "extended bitstream info 2: {not written}\n");
2169 }
2170 }
2171 #endif
2172 16 }
2173
2174 /**
2175 * Finalize encoding and free any memory allocated by the encoder.
2176 *
2177 * @param avctx Codec context
2178 */
2179 16 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
2180 {
2181 16 AC3EncodeContext *s = avctx->priv_data;
2182
2183
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 50 for (int ch = 0; ch < s->channels; ch++)
2184 34 av_freep(&s->planar_samples[ch]);
2185 16 av_freep(&s->input_samples[0]);
2186 16 av_freep(&s->bap_buffer);
2187 16 av_freep(&s->bap1_buffer);
2188 16 av_freep(&s->mdct_coef_buffer);
2189 16 av_freep(&s->fixed_coef_buffer);
2190 16 av_freep(&s->exp_buffer);
2191 16 av_freep(&s->grouped_exp_buffer);
2192 16 av_freep(&s->psd_buffer);
2193 16 av_freep(&s->band_psd_buffer);
2194 16 av_freep(&s->mask_buffer);
2195 16 av_freep(&s->qmant_buffer);
2196 16 av_freep(&s->cpl_coord_buffer);
2197 16 av_freep(&s->fdsp);
2198
2199 16 ff_af_queue_close(&s->afq);
2200 16 av_tx_uninit(&s->tx);
2201
2202 16 return 0;
2203 }
2204
2205
2206 /*
2207 * Set channel information during initialization.
2208 */
2209 16 static av_cold void set_channel_info(AVCodecContext *avctx)
2210 {
2211 16 AC3EncodeContext *s = avctx->priv_data;
2212 16 uint64_t mask = av_channel_layout_subset(&avctx->ch_layout, ~(uint64_t)0);
2213 16 int channels = avctx->ch_layout.nb_channels;
2214
2215 16 s->lfe_on = !!(mask & AV_CH_LOW_FREQUENCY);
2216 16 s->channels = channels;
2217 16 s->fbw_channels = channels - s->lfe_on;
2218
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 16 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
2219
2220
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 16 switch (mask & ~AV_CH_LOW_FREQUENCY) {
2221 6 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
2222 8 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
2223 ✗ case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
2224 ✗ case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
2225 ✗ case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
2226 ✗ case AV_CH_LAYOUT_QUAD:
2227 ✗ case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
2228 2 case AV_CH_LAYOUT_5POINT0:
2229 2 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
2230 }
2231
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 16 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
2232 16 s->has_surround = s->channel_mode & 0x04;
2233
2234 16 s->channel_map = ac3_enc_channel_map[s->channel_mode][s->lfe_on];
2235 16 }
2236
2237
2238 16 static av_cold int validate_options(AC3EncodeContext *s)
2239 {
2240 16 AVCodecContext *avctx = s->avctx;
2241 int ret;
2242
2243 16 set_channel_info(avctx);
2244
2245 29 for (int i = 0;; i++) {
2246
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 29 if (ff_ac3_sample_rate_tab[i] == avctx->sample_rate) {
2247 16 s->bit_alloc.sr_code = i;
2248 16 break;
2249 }
2250 av_assert1(ff_ac3_sample_rate_tab[i] != 0);
2251 }
2252 16 s->sample_rate = avctx->sample_rate;
2253
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 16 s->bitstream_id = s->eac3 ? 16 : 8;
2254
2255 /* select a default bit rate if not set by the user */
2256
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 16 if (!avctx->bit_rate) {
2257
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 5 switch (s->fbw_channels) {
2258 5 case 1: avctx->bit_rate = 96000; break;
2259 ✗ case 2: avctx->bit_rate = 192000; break;
2260 ✗ case 3: avctx->bit_rate = 320000; break;
2261 ✗ case 4: avctx->bit_rate = 384000; break;
2262 ✗ case 5: avctx->bit_rate = 448000; break;
2263 }
2264 }
2265
2266 /* validate bit rate */
2267
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 16 if (s->eac3) {
2268 int max_br, min_br, wpf, min_br_code;
2269 int num_blks_code, num_blocks, frame_samples;
2270 long long min_br_dist;
2271
2272 /* calculate min/max bitrate */
2273 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
2274 found use either 6 blocks or 1 block, even though 2 or 3 blocks
2275 would work as far as the bit rate is concerned. */
2276
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 2 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
2277 2 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
2278 2 frame_samples = AC3_BLOCK_SIZE * num_blocks;
2279 2 max_br = 2048 * s->sample_rate / frame_samples * 16;
2280 2 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
2281
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 2 if (avctx->bit_rate <= max_br)
2282 2 break;
2283 }
2284
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 2 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
2285 ✗ av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
2286 "for this sample rate\n", min_br, max_br);
2287 ✗ return AVERROR(EINVAL);
2288 }
2289 2 s->num_blks_code = num_blks_code;
2290 2 s->num_blocks = num_blocks;
2291
2292 /* calculate words-per-frame for the selected bitrate */
2293 2 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
2294 av_assert1(wpf > 0 && wpf <= 2048);
2295
2296 /* find the closest AC-3 bitrate code to the selected bitrate.
2297 this is needed for lookup tables for bandwidth and coupling
2298 parameter selection */
2299 2 min_br_code = -1;
2300 2 min_br_dist = INT64_MAX;
2301
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 40 for (int i = 0; i < 19; i++) {
2302 38 long long br_dist = llabs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
2303
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 38 if (br_dist < min_br_dist) {
2304 18 min_br_dist = br_dist;
2305 18 min_br_code = i;
2306 }
2307 }
2308
2309 /* make sure the minimum frame size is below the average frame size */
2310 2 s->frame_size_code = min_br_code << 1;
2311
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 2 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
2312 ✗ wpf--;
2313 2 s->frame_size_min = 2 * wpf;
2314 } else {
2315 14 int best_br = 0, best_code = 0;
2316 14 long long best_diff = INT64_MAX;
2317
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 124 for (int i = 0; i < 19; i++) {
2318 124 int br = ff_ac3_bitrate_tab[i] * 1000;
2319 124 long long diff = llabs(br - avctx->bit_rate);
2320
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 124 if (diff < best_diff) {
2321 124 best_br = br;
2322 124 best_code = i;
2323 124 best_diff = diff;
2324 }
2325
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 124 if (!best_diff)
2326 14 break;
2327 }
2328 14 avctx->bit_rate = best_br;
2329 14 s->frame_size_code = best_code << 1;
2330 14 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
2331 14 s->num_blks_code = 0x3;
2332 14 s->num_blocks = 6;
2333 }
2334 16 s->bit_rate = avctx->bit_rate;
2335 16 s->frame_size = s->frame_size_min;
2336
2337 /* validate cutoff */
2338
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 16 if (avctx->cutoff < 0) {
2339 ✗ av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
2340 ✗ return AVERROR(EINVAL);
2341 }
2342 16 s->cutoff = avctx->cutoff;
2343
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 16 if (s->cutoff > (s->sample_rate >> 1))
2344 ✗ s->cutoff = s->sample_rate >> 1;
2345
2346 16 ret = ac3_validate_metadata(s);
2347
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 16 if (ret)
2348 ✗ return ret;
2349
2350
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 31 s->rematrixing_enabled = s->options.stereo_rematrixing &&
2351
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 15 (s->channel_mode == AC3_CHMODE_STEREO);
2352
2353
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 31 s->cpl_enabled = s->options.channel_coupling &&
2354
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 15 s->channel_mode >= AC3_CHMODE_STEREO;
2355
2356 16 return 0;
2357 }
2358
2359
2360 /*
2361 * Set bandwidth for all channels.
2362 * The user can optionally supply a cutoff frequency. Otherwise an appropriate
2363 * default value will be used.
2364 */
2365 16 static av_cold void set_bandwidth(AC3EncodeContext *s)
2366 {
2367 16 int blk, ch, av_uninit(cpl_start);
2368
2369
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 16 if (s->cutoff) {
2370 /* calculate bandwidth based on user-specified cutoff frequency */
2371 int fbw_coeffs;
2372 ✗ fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
2373 ✗ s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
2374 } else {
2375 /* use default bandwidth setting */
2376 16 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
2377 }
2378
2379 /* set number of coefficients for each channel */
2380
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 48 for (ch = 1; ch <= s->fbw_channels; ch++) {
2381 32 s->start_freq[ch] = 0;
2382
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 224 for (blk = 0; blk < s->num_blocks; blk++)
2383 192 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
2384 }
2385 /* LFE channel always has 7 coefs */
2386
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 16 if (s->lfe_on) {
2387 2 s->start_freq[s->lfe_channel] = 0;
2388
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 14 for (blk = 0; blk < s->num_blocks; blk++)
2389 12 s->blocks[blk].end_freq[ch] = 7;
2390 }
2391
2392 /* initialize coupling strategy */
2393
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 16 if (s->cpl_enabled) {
2394
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 9 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
2395 ✗ cpl_start = s->options.cpl_start;
2396 } else {
2397 9 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
2398
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 9 if (cpl_start < 0) {
2399 ✗ if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
2400 ✗ s->cpl_enabled = 0;
2401 else
2402 ✗ cpl_start = 15;
2403 }
2404 }
2405 }
2406
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 16 if (s->cpl_enabled) {
2407 int i, cpl_start_band, cpl_end_band;
2408 9 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
2409
2410 9 cpl_end_band = s->bandwidth_code / 4 + 3;
2411 9 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
2412
2413 9 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
2414
2415 9 s->num_cpl_bands = 1;
2416 9 *cpl_band_sizes = 12;
2417
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 52 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
2418
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 43 if (ff_eac3_default_cpl_band_struct[i]) {
2419 13 *cpl_band_sizes += 12;
2420 } else {
2421 30 s->num_cpl_bands++;
2422 30 cpl_band_sizes++;
2423 30 *cpl_band_sizes = 12;
2424 }
2425 }
2426
2427 9 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
2428 9 s->cpl_end_freq = cpl_end_band * 12 + 37;
2429
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 63 for (blk = 0; blk < s->num_blocks; blk++)
2430 54 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
2431 }
2432 16 }
2433
2434
2435 16 static av_cold int allocate_buffers(AC3EncodeContext *s)
2436 {
2437 int blk, ch;
2438 16 int channels = s->channels + 1; /* includes coupling channel */
2439 16 int channel_blocks = channels * s->num_blocks;
2440 16 int total_coefs = AC3_MAX_COEFS * channel_blocks;
2441 uint8_t *cpl_coord_mant_buffer;
2442 16 const unsigned sampletype_size = SAMPLETYPE_SIZE(s);
2443
2444
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 50 for (int ch = 0; ch < s->channels; ch++) {
2445 34 s->planar_samples[ch] = av_mallocz(AC3_BLOCK_SIZE * sampletype_size);
2446
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 34 if (!s->planar_samples[ch])
2447 ✗ return AVERROR(ENOMEM);
2448 }
2449 16 int ret = av_samples_alloc(s->input_samples, NULL, s->channels,
2450 16 AC3_BLOCK_SIZE * s->num_blocks,
2451 16 s->avctx->sample_fmt, 0);
2452
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 16 if (ret < 0)
2453 ✗ return ret;
2454
2455
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 16 if (!FF_ALLOC_TYPED_ARRAY(s->bap_buffer, total_coefs) ||
2456
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 16 !FF_ALLOC_TYPED_ARRAY(s->bap1_buffer, total_coefs) ||
2457
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 16 !FF_ALLOCZ_TYPED_ARRAY(s->mdct_coef_buffer, total_coefs) ||
2458
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 16 !FF_ALLOC_TYPED_ARRAY(s->exp_buffer, total_coefs) ||
2459
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 16 !FF_ALLOC_TYPED_ARRAY(s->grouped_exp_buffer, channel_blocks * 128) ||
2460
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 16 !FF_ALLOC_TYPED_ARRAY(s->psd_buffer, total_coefs) ||
2461
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 16 !FF_ALLOC_TYPED_ARRAY(s->band_psd_buffer, channel_blocks * 64) ||
2462
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 16 !FF_ALLOC_TYPED_ARRAY(s->mask_buffer, channel_blocks * 64) ||
2463
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 16 !FF_ALLOC_TYPED_ARRAY(s->qmant_buffer, total_coefs))
2464 ✗ return AVERROR(ENOMEM);
2465
2466
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 16 if (!s->fixed_point) {
2467
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 4 if (!FF_ALLOCZ_TYPED_ARRAY(s->fixed_coef_buffer, total_coefs))
2468 ✗ return AVERROR(ENOMEM);
2469 }
2470
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 16 if (s->cpl_enabled) {
2471
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 9 if (!FF_ALLOC_TYPED_ARRAY(s->cpl_coord_buffer, channel_blocks * 32))
2472 ✗ return AVERROR(ENOMEM);
2473 9 cpl_coord_mant_buffer = s->cpl_coord_buffer + 16 * channel_blocks;
2474 }
2475
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 112 for (blk = 0; blk < s->num_blocks; blk++) {
2476 96 AC3Block *block = &s->blocks[blk];
2477
2478
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 396 for (ch = 0; ch < channels; ch++) {
2479 /* arrangement: block, channel, coeff */
2480 300 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
2481 300 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2482 300 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
2483 300 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
2484 300 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
2485
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 300 if (s->cpl_enabled) {
2486 210 block->cpl_coord_exp[ch] = &s->cpl_coord_buffer [16 * (blk * channels + ch)];
2487 210 block->cpl_coord_mant[ch] = &cpl_coord_mant_buffer[16 * (blk * channels + ch)];
2488 }
2489
2490 /* arrangement: channel, block, coeff */
2491 300 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2492 300 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2493
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 300 if (s->fixed_point)
2494 228 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
2495 else
2496 72 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
2497 }
2498 }
2499
2500 16 return 0;
2501 }
2502
2503
2504 16 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
2505 {
2506 static AVOnce init_static_once = AV_ONCE_INIT;
2507 16 AC3EncodeContext *s = avctx->priv_data;
2508 int ret, frame_size_58;
2509
2510 16 s->avctx = avctx;
2511
2512 16 ret = validate_options(s);
2513
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 16 if (ret)
2514 ✗ return ret;
2515
2516 16 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
2517 16 avctx->initial_padding = AC3_BLOCK_SIZE;
2518
2519 16 s->bitstream_mode = avctx->audio_service_type;
2520
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 16 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
2521 ✗ s->bitstream_mode = 0x7;
2522
2523 16 s->bits_written = 0;
2524 16 s->samples_written = 0;
2525
2526 /* calculate crc_inv for both possible frame sizes */
2527 16 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
2528 16 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2529
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 16 if (s->bit_alloc.sr_code == 1) {
2530 13 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
2531 13 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
2532 }
2533
2534
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 16 if (!s->output_frame_header)
2535 14 s->output_frame_header = ac3_output_frame_header;
2536
2537 16 set_bandwidth(s);
2538
2539 16 bit_alloc_init(s);
2540
2541 16 ret = allocate_buffers(s);
2542
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 16 if (ret)
2543 ✗ return ret;
2544
2545 16 ff_audiodsp_init(&s->adsp);
2546 16 ff_me_cmp_init(&s->mecc, avctx);
2547 16 ff_ac3dsp_init(&s->ac3dsp);
2548
2549 16 dprint_options(s);
2550
2551 16 ff_af_queue_init(avctx, &s->afq);
2552
2553 16 ff_thread_once(&init_static_once, exponent_init);
2554
2555 16 return 0;
2556 }
2557