FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ac3dec.c
Date: 2025-06-30 14:39:11
Exec Total Coverage
Lines: 798 977 81.7%
Functions: 23 23 100.0%
Branches: 543 707 76.8%
Line Branch Exec Source
1 /*
2 * AC-3 Audio Decoder
3 * This code was developed as part of Google Summer of Code 2006.
4 * E-AC-3 support was added as part of Google Summer of Code 2007.
5 *
6 * Copyright (c) 2006 Kartikey Mahendra BHATT (bhattkm at gmail dot com)
7 * Copyright (c) 2007-2008 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
8 * Copyright (c) 2007 Justin Ruggles <justin.ruggles@gmail.com>
9 *
10 * This file is part of FFmpeg.
11 *
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27 #include "config_components.h"
28
29 #include <stdio.h>
30 #include <stddef.h>
31 #include <math.h>
32 #include <string.h>
33
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/crc.h"
36 #include "libavutil/downmix_info.h"
37 #include "libavutil/intmath.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/thread.h"
41 #include "bswapdsp.h"
42 #include "ac3_parser_internal.h"
43 #include "ac3dec.h"
44 #include "ac3dec_data.h"
45 #include "ac3defs.h"
46 #include "decode.h"
47 #include "kbdwin.h"
48
49 #if (!USE_FIXED)
50 /** dynamic range table. converts codes to scale factors. */
51 static float dynamic_range_tab[256];
52 float ff_ac3_heavy_dynamic_range_tab[256];
53
54 /*
55 * Initialize tables at runtime.
56 */
57 46 static av_cold void ac3_float_tables_init(void)
58 {
59 /* generate dynamic range table
60 reference: Section 7.7.1 Dynamic Range Control */
61
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 11822 for (int i = 0; i < 256; i++) {
62 11776 int v = (i >> 5) - ((i >> 7) << 3) - 5;
63 11776 dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0x1F) | 0x20);
64 }
65
66 /* generate compr dynamic range table
67 reference: Section 7.7.2 Heavy Compression */
68
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 11822 for (int i = 0; i < 256; i++) {
69 11776 int v = (i >> 4) - ((i >> 7) << 4) - 4;
70 11776 ff_ac3_heavy_dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0xF) | 0x10);
71 }
72 46 ff_ac3_init_static();
73 46 }
74 #endif
75
76 260 static void ac3_downmix(AVCodecContext *avctx)
77 {
78 260 AC3DecodeContext *s = avctx->priv_data;
79 260 const AVChannelLayout mono = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
80 260 const AVChannelLayout stereo = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
81
82 /* allow downmixing to stereo or mono */
83
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 471 if (avctx->ch_layout.nb_channels > 1 &&
84 211 !av_channel_layout_compare(&s->downmix_layout, &mono)) {
85 4 av_channel_layout_uninit(&avctx->ch_layout);
86 4 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
87
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 434 } else if (avctx->ch_layout.nb_channels > 2 &&
88 178 !av_channel_layout_compare(&s->downmix_layout, &stereo)) {
89 3 av_channel_layout_uninit(&avctx->ch_layout);
90 3 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
91 }
92 260 }
93
94 /**
95 * AVCodec initialization
96 */
97 101 static av_cold int ac3_decode_init(AVCodecContext *avctx)
98 {
99 101 AC3DecodeContext *s = avctx->priv_data;
100 101 const float scale = 1.0f;
101 int i, ret;
102
103 101 s->avctx = avctx;
104
105
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 101 if ((ret = av_tx_init(&s->tx_128, &s->tx_fn_128, IMDCT_TYPE, 1, 128, &scale, 0)))
106 ✗ return ret;
107
108
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 101 if ((ret = av_tx_init(&s->tx_256, &s->tx_fn_256, IMDCT_TYPE, 1, 256, &scale, 0)))
109 ✗ return ret;
110
111 101 AC3_RENAME(ff_kbd_window_init)(s->window, 5.0, 256);
112 101 ff_bswapdsp_init(&s->bdsp);
113
114 #if (USE_FIXED)
115 4 s->fdsp = avpriv_alloc_fixed_dsp(avctx->flags & AV_CODEC_FLAG_BITEXACT);
116 #else
117 97 ff_fmt_convert_init(&s->fmt_conv);
118 97 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
119 #endif
120
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 101 if (!s->fdsp)
121 ✗ return AVERROR(ENOMEM);
122
123 101 ff_ac3dsp_init(&s->ac3dsp);
124 101 av_lfg_init(&s->dith_state, 0);
125
126 if (USE_FIXED)
127 4 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
128 else
129 97 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
130
131 101 ac3_downmix(avctx);
132 101 s->downmixed = 1;
133
134
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 808 for (i = 0; i < AC3_MAX_CHANNELS; i++) {
135 707 s->xcfptr[i] = s->transform_coeffs[i];
136 707 s->dlyptr[i] = s->delay[i];
137 }
138
139 #if USE_FIXED
140 4 ff_ac3_init_static();
141 #else
142 static AVOnce init_static_once = AV_ONCE_INIT;
143 97 ff_thread_once(&init_static_once, ac3_float_tables_init);
144 #endif
145
146 101 return 0;
147 }
148
149 1 static av_cold void ac3_decode_flush(AVCodecContext *avctx)
150 {
151 1 AC3DecodeContext *s = avctx->priv_data;
152
153 1 memset(&s->frame_type, 0, sizeof(*s) - offsetof(AC3DecodeContext, frame_type));
154
155 1 AC3_RENAME(ff_kbd_window_init)(s->window, 5.0, 256);
156 1 av_lfg_init(&s->dith_state, 0);
157 1 }
158
159 /**
160 * Common function to parse AC-3 or E-AC-3 frame header
161 */
162 2474 static int parse_frame_header(AC3DecodeContext *s)
163 {
164 AC3HeaderInfo hdr;
165 int err;
166
167 2474 err = ff_ac3_parse_header(&s->gbc, &hdr);
168
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 2474 if (err)
169 ✗ return err;
170
171 /* get decoding parameters from header info */
172 2474 s->bit_alloc_params.sr_code = hdr.sr_code;
173 2474 s->bitstream_id = hdr.bitstream_id;
174 2474 s->bitstream_mode = hdr.bitstream_mode;
175 2474 s->channel_mode = hdr.channel_mode;
176 2474 s->lfe_on = hdr.lfe_on;
177 2474 s->bit_alloc_params.sr_shift = hdr.sr_shift;
178 2474 s->sample_rate = hdr.sample_rate;
179 2474 s->bit_rate = hdr.bit_rate;
180 2474 s->channels = hdr.channels;
181 2474 s->fbw_channels = s->channels - s->lfe_on;
182 2474 s->lfe_ch = s->fbw_channels + 1;
183 2474 s->frame_size = hdr.frame_size;
184 2474 s->superframe_size += hdr.frame_size;
185 2474 s->preferred_downmix = AC3_DMIXMOD_NOTINDICATED;
186
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 2474 if (hdr.bitstream_id <= 10) {
187 1270 s->center_mix_level = hdr.center_mix_level;
188 1270 s->surround_mix_level = hdr.surround_mix_level;
189 }
190 2474 s->center_mix_level_ltrt = 4; // -3.0dB
191 2474 s->surround_mix_level_ltrt = 4; // -3.0dB
192 2474 s->lfe_mix_level_exists = 0;
193 2474 s->num_blocks = hdr.num_blocks;
194 2474 s->frame_type = hdr.frame_type;
195 2474 s->substreamid = hdr.substreamid;
196 2474 s->dolby_surround_mode = hdr.dolby_surround_mode;
197 2474 s->dolby_surround_ex_mode = AC3_DSUREXMOD_NOTINDICATED;
198 2474 s->dolby_headphone_mode = AC3_DHEADPHONMOD_NOTINDICATED;
199
200
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 2474 if (s->lfe_on) {
201 602 s->start_freq[s->lfe_ch] = 0;
202 602 s->end_freq[s->lfe_ch] = 7;
203 602 s->num_exp_groups[s->lfe_ch] = 2;
204 602 s->channel_in_cpl[s->lfe_ch] = 0;
205 }
206
207
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 2474 if (s->bitstream_id <= 10) {
208 1270 s->eac3 = 0;
209 1270 s->snr_offset_strategy = 2;
210 1270 s->block_switch_syntax = 1;
211 1270 s->dither_flag_syntax = 1;
212 1270 s->bit_allocation_syntax = 1;
213 1270 s->fast_gain_syntax = 0;
214 1270 s->first_cpl_leak = 0;
215 1270 s->dba_syntax = 1;
216 1270 s->skip_syntax = 1;
217 1270 memset(s->channel_uses_aht, 0, sizeof(s->channel_uses_aht));
218 /* volume control params */
219
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 2540 for (int i = 0; i < (s->channel_mode ? 1 : 2); i++) {
220 1270 s->dialog_normalization[i] = hdr.dialog_normalization[i];
221
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 1270 if (s->dialog_normalization[i] == 0) {
222 ✗ s->dialog_normalization[i] = -31;
223 }
224
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 1270 if (s->target_level != 0) {
225 ✗ s->level_gain[i] = powf(2.0f,
226 ✗ (float)(s->target_level - s->dialog_normalization[i])/6.0f);
227 }
228 1270 s->compression_exists[i] = hdr.compression_exists[i];
229
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 1270 if (s->compression_exists[i]) {
230 988 s->heavy_dynamic_range[i] = AC3_HEAVY_RANGE(hdr.heavy_dynamic_range[i]);
231 }
232 }
233 1270 return 0;
234 } else if (CONFIG_EAC3_DECODER) {
235 1204 s->eac3 = 1;
236 1204 return ff_eac3_parse_header(s, &hdr);
237 } else {
238 av_log(s->avctx, AV_LOG_ERROR, "E-AC-3 support not compiled in\n");
239 return AVERROR(ENOSYS);
240 }
241 }
242
243 /**
244 * Set stereo downmixing coefficients based on frame header info.
245 * reference: Section 7.8.2 Downmixing Into Two Channels
246 */
247 417 static int set_downmix_coeffs(AC3DecodeContext *s)
248 {
249 int i;
250 417 float cmix = ff_ac3_gain_levels[s-> center_mix_level];
251 417 float smix = ff_ac3_gain_levels[s->surround_mix_level];
252 float norm0, norm1;
253 float downmix_coeffs[2][AC3_MAX_CHANNELS];
254
255
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 417 if (!s->downmix_coeffs[0]) {
256 14 s->downmix_coeffs[0] = av_malloc_array(2 * AC3_MAX_CHANNELS,
257 sizeof(**s->downmix_coeffs));
258
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 14 if (!s->downmix_coeffs[0])
259 ✗ return AVERROR(ENOMEM);
260 14 s->downmix_coeffs[1] = s->downmix_coeffs[0] + AC3_MAX_CHANNELS;
261 }
262
263
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 2313 for (i = 0; i < s->fbw_channels; i++) {
264 1896 downmix_coeffs[0][i] = ff_ac3_gain_levels[ff_ac3_default_coeffs[s->channel_mode][i][0]];
265 1896 downmix_coeffs[1][i] = ff_ac3_gain_levels[ff_ac3_default_coeffs[s->channel_mode][i][1]];
266 }
267
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 417 if (s->channel_mode > 1 && s->channel_mode & 1) {
268 417 downmix_coeffs[0][1] = downmix_coeffs[1][1] = cmix;
269 }
270
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 417 if (s->channel_mode == AC3_CHMODE_2F1R || s->channel_mode == AC3_CHMODE_3F1R) {
271 189 int nf = s->channel_mode - 2;
272 189 downmix_coeffs[0][nf] = downmix_coeffs[1][nf] = smix * LEVEL_MINUS_3DB;
273 }
274
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 417 if (s->channel_mode == AC3_CHMODE_2F2R || s->channel_mode == AC3_CHMODE_3F2R) {
275 228 int nf = s->channel_mode - 4;
276 228 downmix_coeffs[0][nf] = downmix_coeffs[1][nf+1] = smix;
277 }
278
279 /* renormalize */
280 417 norm0 = norm1 = 0.0;
281
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 2313 for (i = 0; i < s->fbw_channels; i++) {
282 1896 norm0 += downmix_coeffs[0][i];
283 1896 norm1 += downmix_coeffs[1][i];
284 }
285 417 norm0 = 1.0f / norm0;
286 417 norm1 = 1.0f / norm1;
287
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 2313 for (i = 0; i < s->fbw_channels; i++) {
288 1896 downmix_coeffs[0][i] *= norm0;
289 1896 downmix_coeffs[1][i] *= norm1;
290 }
291
292
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 417 if (s->output_mode == AC3_CHMODE_MONO) {
293
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 1314 for (i = 0; i < s->fbw_channels; i++)
294 1074 downmix_coeffs[0][i] = (downmix_coeffs[0][i] +
295 1074 downmix_coeffs[1][i]) * LEVEL_MINUS_3DB;
296 }
297
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 2313 for (i = 0; i < s->fbw_channels; i++) {
298 1896 s->downmix_coeffs[0][i] = FIXR12(downmix_coeffs[0][i]);
299 1896 s->downmix_coeffs[1][i] = FIXR12(downmix_coeffs[1][i]);
300 }
301
302 417 return 0;
303 }
304
305 /**
306 * Decode the grouped exponents according to exponent strategy.
307 * reference: Section 7.1.3 Exponent Decoding
308 */
309 13652 static int decode_exponents(AC3DecodeContext *s,
310 GetBitContext *gbc, int exp_strategy, int ngrps,
311 uint8_t absexp, int8_t *dexps)
312 {
313 int i, j, grp, group_size;
314 int dexp[256];
315 int expacc, prevexp;
316
317 /* unpack groups */
318 13652 group_size = exp_strategy + (exp_strategy == EXP_D45);
319
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 489186 for (grp = 0, i = 0; grp < ngrps; grp++) {
320 475534 expacc = get_bits(gbc, 7);
321
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 475534 if (expacc >= 125) {
322 ✗ av_log(s->avctx, AV_LOG_ERROR, "expacc %d is out-of-range\n", expacc);
323 ✗ return AVERROR_INVALIDDATA;
324 }
325 475534 dexp[i++] = ff_ac3_ungroup_3_in_7_bits_tab[expacc][0];
326 475534 dexp[i++] = ff_ac3_ungroup_3_in_7_bits_tab[expacc][1];
327 475534 dexp[i++] = ff_ac3_ungroup_3_in_7_bits_tab[expacc][2];
328 }
329
330 /* convert to absolute exps and expand groups */
331 13652 prevexp = absexp;
332
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 1440254 for (i = 0, j = 0; i < ngrps * 3; i++) {
333 1426602 prevexp += dexp[i] - 2;
334
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 1426602 if (prevexp > 24U) {
335 ✗ av_log(s->avctx, AV_LOG_ERROR, "exponent %d is out-of-range\n", prevexp);
336 ✗ return AVERROR_INVALIDDATA;
337 }
338
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 1426602 switch (group_size) {
339 104358 case 4: dexps[j++] = prevexp;
340 104358 dexps[j++] = prevexp;
341 274638 case 2: dexps[j++] = prevexp;
342 1426602 case 1: dexps[j++] = prevexp;
343 }
344 }
345 13652 return 0;
346 }
347
348 /**
349 * Generate transform coefficients for each coupled channel in the coupling
350 * range using the coupling coefficients and coupling coordinates.
351 * reference: Section 7.4.3 Coupling Coordinate Format
352 */
353 7490 static void calc_transform_coeffs_cpl(AC3DecodeContext *s)
354 {
355 int bin, band, ch;
356
357 7490 bin = s->start_freq[CPL_CH];
358
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 33994 for (band = 0; band < s->num_cpl_bands; band++) {
359 26504 int band_start = bin;
360 26504 int band_end = bin + s->cpl_band_sizes[band];
361
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 89826 for (ch = 1; ch <= s->fbw_channels; ch++) {
362
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 63322 if (s->channel_in_cpl[ch]) {
363 63322 int cpl_coord = s->cpl_coords[ch][band] << 5;
364
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 1507858 for (bin = band_start; bin < band_end; bin++) {
365 1444536 s->fixed_coeffs[ch][bin] =
366 1444536 MULH(s->fixed_coeffs[CPL_CH][bin] * (1 << 4), cpl_coord);
367 }
368
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 63322 if (ch == 2 && s->phase_flags[band]) {
369 ✗ for (bin = band_start; bin < band_end; bin++)
370 ✗ s->fixed_coeffs[2][bin] = -s->fixed_coeffs[2][bin];
371 }
372 }
373 }
374 26504 bin = band_end;
375 }
376 7490 }
377
378 /**
379 * Grouped mantissas for 3-level 5-level and 11-level quantization
380 */
381 typedef struct mant_groups {
382 int b1_mant[2];
383 int b2_mant[2];
384 int b4_mant;
385 int b1;
386 int b2;
387 int b4;
388 } mant_groups;
389
390 /**
391 * Decode the transform coefficients for a particular channel
392 * reference: Section 7.3 Quantization and Decoding of Mantissas
393 */
394 48500 static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
395 {
396 48500 int start_freq = s->start_freq[ch_index];
397 48500 int end_freq = s->end_freq[ch_index];
398 48500 uint8_t *baps = s->bap[ch_index];
399 48500 int8_t *exps = s->dexps[ch_index];
400 48500 int32_t *coeffs = s->fixed_coeffs[ch_index];
401
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 48500 int dither = (ch_index == CPL_CH) || s->dither_flag[ch_index];
402 48500 GetBitContext *gbc = &s->gbc;
403 int freq;
404
405
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 6834230 for (freq = start_freq; freq < end_freq; freq++) {
406 6785730 int bap = baps[freq];
407 int mantissa;
408
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 6785730 switch (bap) {
409 2097029 case 0:
410 /* random noise with approximate range of -0.707 to 0.707 */
411
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 2097029 if (dither)
412 2092722 mantissa = (((av_lfg_get(&s->dith_state)>>8)*181)>>8) - 5931008;
413 else
414 4307 mantissa = 0;
415 2097029 break;
416 1400230 case 1:
417
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 1400230 if (m->b1) {
418 929614 m->b1--;
419 929614 mantissa = m->b1_mant[m->b1];
420 } else {
421 470616 int bits = get_bits(gbc, 5);
422 470616 mantissa = ff_ac3_bap1_mantissas[bits][0];
423 470616 m->b1_mant[1] = ff_ac3_bap1_mantissas[bits][1];
424 470616 m->b1_mant[0] = ff_ac3_bap1_mantissas[bits][2];
425 470616 m->b1 = 2;
426 }
427 1400230 break;
428 644291 case 2:
429
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 644291 if (m->b2) {
430 425873 m->b2--;
431 425873 mantissa = m->b2_mant[m->b2];
432 } else {
433 218418 int bits = get_bits(gbc, 7);
434 218418 mantissa = ff_ac3_bap2_mantissas[bits][0];
435 218418 m->b2_mant[1] = ff_ac3_bap2_mantissas[bits][1];
436 218418 m->b2_mant[0] = ff_ac3_bap2_mantissas[bits][2];
437 218418 m->b2 = 2;
438 }
439 644291 break;
440 750228 case 3:
441 750228 mantissa = ff_ac3_bap3_mantissas[get_bits(gbc, 3)];
442 750228 break;
443 489122 case 4:
444
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 489122 if (m->b4) {
445 241512 m->b4 = 0;
446 241512 mantissa = m->b4_mant;
447 } else {
448 247610 int bits = get_bits(gbc, 7);
449 247610 mantissa = ff_ac3_bap4_mantissas[bits][0];
450 247610 m->b4_mant = ff_ac3_bap4_mantissas[bits][1];
451 247610 m->b4 = 1;
452 }
453 489122 break;
454 404173 case 5:
455 404173 mantissa = ff_ac3_bap5_mantissas[get_bits(gbc, 4)];
456 404173 break;
457 1000657 default: /* 6 to 15 */
458 /* Shift mantissa and sign-extend it. */
459
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 1000657 if (bap > 15) {
460 ✗ av_log(s->avctx, AV_LOG_ERROR, "bap %d is invalid in plain AC-3\n", bap);
461 ✗ bap = 15;
462 }
463 1000657 mantissa = (unsigned)get_sbits(gbc, ff_ac3_quantization_tab[bap]) << (24 - ff_ac3_quantization_tab[bap]);
464 1000657 break;
465 }
466 6785730 coeffs[freq] = mantissa >> exps[freq];
467 }
468 48500 }
469
470 /**
471 * Remove random dithering from coupling range coefficients with zero-bit
472 * mantissas for coupled channels which do not use dithering.
473 * reference: Section 7.3.4 Dither for Zero Bit Mantissas (bap=0)
474 */
475 14312 static void remove_dithering(AC3DecodeContext *s) {
476 int ch, i;
477
478
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 57126 for (ch = 1; ch <= s->fbw_channels; ch++) {
479
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 42814 if (!s->dither_flag[ch] && s->channel_in_cpl[ch]) {
480 ✗ for (i = s->start_freq[CPL_CH]; i < s->end_freq[CPL_CH]; i++) {
481 ✗ if (!s->bap[CPL_CH][i])
482 ✗ s->fixed_coeffs[ch][i] = 0;
483 }
484 }
485 }
486 14312 }
487
488 53396 static inline void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk,
489 int ch, mant_groups *m)
490 {
491
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 53396 if (!s->channel_uses_aht[ch]) {
492 48500 ac3_decode_transform_coeffs_ch(s, ch, m);
493 } else {
494 /* if AHT is used, mantissas for all blocks are encoded in the first
495 block of the frame. */
496 int bin;
497
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 4896 if (CONFIG_EAC3_DECODER && !blk)
498 816 ff_eac3_decode_transform_coeffs_aht_ch(s, ch);
499
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 604116 for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) {
500 599220 s->fixed_coeffs[ch][bin] = s->pre_mantissa[ch][bin][blk] >> s->dexps[ch][bin];
501 }
502 }
503 53396 }
504
505 /**
506 * Decode the transform coefficients.
507 */
508 14312 static inline void decode_transform_coeffs(AC3DecodeContext *s, int blk)
509 {
510 int ch, end;
511 14312 int got_cplchan = 0;
512 mant_groups m;
513
514 14312 m.b1 = m.b2 = m.b4 = 0;
515
516
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 60218 for (ch = 1; ch <= s->channels; ch++) {
517 /* transform coefficients for full-bandwidth channel */
518 45906 decode_transform_coeffs_ch(s, blk, ch, &m);
519 /* transform coefficients for coupling channel come right after the
520 coefficients for the first coupled channel*/
521
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 45906 if (s->channel_in_cpl[ch]) {
522
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 20146 if (!got_cplchan) {
523 7490 decode_transform_coeffs_ch(s, blk, CPL_CH, &m);
524 7490 calc_transform_coeffs_cpl(s);
525 7490 got_cplchan = 1;
526 }
527 20146 end = s->end_freq[CPL_CH];
528 } else {
529 25760 end = s->end_freq[ch];
530 }
531 do
532 3490170 s->fixed_coeffs[ch][end] = 0;
533
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 3490170 while (++end < 256);
534 }
535
536 /* zero the dithered coefficients for appropriate channels */
537 14312 remove_dithering(s);
538 14312 }
539
540 /**
541 * Stereo rematrixing.
542 * reference: Section 7.5.4 Rematrixing : Decoding Technique
543 */
544 8736 static void do_rematrixing(AC3DecodeContext *s)
545 {
546 int bnd, i;
547 int end, bndend;
548
549 8736 end = FFMIN(s->end_freq[1], s->end_freq[2]);
550
551
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 43668 for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++) {
552
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 34932 if (s->rematrixing_flags[bnd]) {
553 23810 bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd + 1]);
554
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 650306 for (i = ff_ac3_rematrix_band_tab[bnd]; i < bndend; i++) {
555 626496 int tmp0 = s->fixed_coeffs[1][i];
556 626496 s->fixed_coeffs[1][i] += s->fixed_coeffs[2][i];
557 626496 s->fixed_coeffs[2][i] = tmp0 - s->fixed_coeffs[2][i];
558 }
559 }
560 }
561 8736 }
562
563 /**
564 * Inverse MDCT Transform.
565 * Convert frequency domain coefficients to time-domain audio samples.
566 * reference: Section 7.9.4 Transformation Equations
567 */
568 14312 static inline void do_imdct(AC3DecodeContext *s, int channels, int offset)
569 {
570 int ch;
571
572
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 51154 for (ch = 1; ch <= channels; ch++) {
573
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 36842 if (s->block_switch[ch]) {
574 int i;
575 6 INTFLOAT *x = s->tmp_output + 128;
576
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 774 for (i = 0; i < 128; i++)
577 768 x[i] = s->transform_coeffs[ch][2 * i];
578 6 s->tx_fn_128(s->tx_128, s->tmp_output, x, sizeof(INTFLOAT));
579 #if USE_FIXED
580 2 s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset],
581 2 s->tmp_output, s->window, 128, 8);
582 #else
583 4 s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset],
584 4 s->tmp_output, s->window, 128);
585 #endif
586
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 774 for (i = 0; i < 128; i++)
587 768 x[i] = s->transform_coeffs[ch][2 * i + 1];
588 6 s->tx_fn_128(s->tx_128, s->delay[ch - 1 + offset], x, sizeof(INTFLOAT));
589 } else {
590 36836 s->tx_fn_256(s->tx_256, s->tmp_output, s->transform_coeffs[ch], sizeof(INTFLOAT));
591 #if USE_FIXED
592 2923 s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset],
593 2923 s->tmp_output, s->window, 128, 8);
594 #else
595 33913 s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset],
596 33913 s->tmp_output, s->window, 128);
597 #endif
598 36836 memcpy(s->delay[ch - 1 + offset], s->tmp_output + 128, 128 * sizeof(INTFLOAT));
599 }
600 }
601 14312 }
602
603 /**
604 * Upmix delay samples from stereo to original channel layout.
605 */
606 6 static void ac3_upmix_delay(AC3DecodeContext *s)
607 {
608 6 int channel_data_size = sizeof(s->delay[0]);
609
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 6 switch (s->channel_mode) {
610 2 case AC3_CHMODE_DUALMONO:
611 case AC3_CHMODE_STEREO:
612 /* upmix mono to stereo */
613 2 memcpy(s->delay[1], s->delay[0], channel_data_size);
614 2 break;
615 ✗ case AC3_CHMODE_2F2R:
616 ✗ memset(s->delay[3], 0, channel_data_size);
617 ✗ case AC3_CHMODE_2F1R:
618 ✗ memset(s->delay[2], 0, channel_data_size);
619 ✗ break;
620 ✗ case AC3_CHMODE_3F2R:
621 ✗ memset(s->delay[4], 0, channel_data_size);
622 4 case AC3_CHMODE_3F1R:
623 4 memset(s->delay[3], 0, channel_data_size);
624 4 case AC3_CHMODE_3F:
625 4 memcpy(s->delay[2], s->delay[1], channel_data_size);
626 4 memset(s->delay[1], 0, channel_data_size);
627 4 break;
628 }
629 6 }
630
631 /**
632 * Decode band structure for coupling, spectral extension, or enhanced coupling.
633 * The band structure defines how many subbands are in each band. For each
634 * subband in the range, 1 means it is combined with the previous band, and 0
635 * means that it starts a new band.
636 *
637 * @param[in] gbc bit reader context
638 * @param[in] blk block number
639 * @param[in] eac3 flag to indicate E-AC-3
640 * @param[in] ecpl flag to indicate enhanced coupling
641 * @param[in] start_subband subband number for start of range
642 * @param[in] end_subband subband number for end of range
643 * @param[in] default_band_struct default band structure table
644 * @param[out] num_bands number of bands (optionally NULL)
645 * @param[out] band_sizes array containing the number of bins in each band (optionally NULL)
646 * @param[in,out] band_struct current band structure
647 */
648 1791 static void decode_band_structure(GetBitContext *gbc, int blk, int eac3,
649 int ecpl, int start_subband, int end_subband,
650 const uint8_t *default_band_struct,
651 int *num_bands, uint8_t *band_sizes,
652 uint8_t *band_struct, int band_struct_size)
653 {
654 1791 int subbnd, bnd, n_subbands, n_bands=0;
655 uint8_t bnd_sz[22];
656
657 1791 n_subbands = end_subband - start_subband;
658
659
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 1791 if (!blk)
660 1791 memcpy(band_struct, default_band_struct, band_struct_size);
661
662
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 1791 av_assert0(band_struct_size >= start_subband + n_subbands);
663
664 1791 band_struct += start_subband + 1;
665
666 /* decode band structure from bitstream or use default */
667
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 1791 if (!eac3 || get_bits1(gbc)) {
668
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 6618 for (subbnd = 0; subbnd < n_subbands - 1; subbnd++) {
669 5232 band_struct[subbnd] = get_bits1(gbc);
670 }
671 }
672
673 /* calculate number of bands and band sizes based on band structure.
674 note that the first 4 subbands in enhanced coupling span only 6 bins
675 instead of 12. */
676
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 1791 if (num_bands || band_sizes ) {
677 1791 n_bands = n_subbands;
678
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 1791 bnd_sz[0] = ecpl ? 6 : 12;
679
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 9167 for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) {
680
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 7376 int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12;
681
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 7376 if (band_struct[subbnd - 1]) {
682 3519 n_bands--;
683 3519 bnd_sz[bnd] += subbnd_size;
684 } else {
685 3857 bnd_sz[++bnd] = subbnd_size;
686 }
687 }
688 }
689
690 /* set optional output params */
691
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 1791 if (num_bands)
692 1791 *num_bands = n_bands;
693
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 1791 if (band_sizes)
694 1791 memcpy(band_sizes, bnd_sz, n_bands);
695 1791 }
696
697 542 static inline int spx_strategy(AC3DecodeContext *s, int blk)
698 {
699 542 GetBitContext *bc = &s->gbc;
700 int dst_start_freq, dst_end_freq, src_start_freq,
701 start_subband, end_subband;
702
703 /* determine which channels use spx */
704
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 542 if (s->channel_mode == AC3_CHMODE_MONO) {
705 ✗ s->channel_uses_spx[1] = 1;
706 } else {
707 542 unsigned channel_uses_spx = get_bits(bc, s->fbw_channels);
708
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 1770 for (int ch = s->fbw_channels; ch >= 1; --ch) {
709 1228 s->channel_uses_spx[ch] = channel_uses_spx & 1;
710 1228 channel_uses_spx >>= 1;
711 }
712 }
713
714 /* get the frequency bins of the spx copy region and the spx start
715 and end subbands */
716 542 dst_start_freq = get_bits(bc, 2);
717 542 start_subband = get_bits(bc, 3) + 2;
718
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 542 if (start_subband > 7)
719 494 start_subband += start_subband - 7;
720 542 end_subband = get_bits(bc, 3) + 5;
721 #if USE_FIXED
722 ✗ s->spx_dst_end_freq = end_freq_inv_tab[end_subband-5];
723 #endif
724
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 542 if (end_subband > 7)
725 542 end_subband += end_subband - 7;
726 542 dst_start_freq = dst_start_freq * 12 + 25;
727 542 src_start_freq = start_subband * 12 + 25;
728 542 dst_end_freq = end_subband * 12 + 25;
729
730 /* check validity of spx ranges */
731
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 542 if (start_subband >= end_subband) {
732 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
733 "range (%d >= %d)\n", start_subband, end_subband);
734 ✗ return AVERROR_INVALIDDATA;
735 }
736
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 542 if (dst_start_freq >= src_start_freq) {
737 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
738 "copy start bin (%d >= %d)\n", dst_start_freq, src_start_freq);
739 ✗ return AVERROR_INVALIDDATA;
740 }
741
742 542 s->spx_dst_start_freq = dst_start_freq;
743 542 s->spx_src_start_freq = src_start_freq;
744 if (!USE_FIXED)
745 542 s->spx_dst_end_freq = dst_end_freq;
746
747 542 decode_band_structure(bc, blk, s->eac3, 0,
748 start_subband, end_subband,
749 ff_eac3_default_spx_band_struct,
750 &s->num_spx_bands,
751 542 s->spx_band_sizes,
752 542 s->spx_band_struct, sizeof(s->spx_band_struct));
753 542 return 0;
754 }
755
756 3252 static inline void spx_coordinates(AC3DecodeContext *s)
757 {
758 3252 GetBitContext *bc = &s->gbc;
759 3252 int fbw_channels = s->fbw_channels;
760 int ch, bnd;
761
762
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 10620 for (ch = 1; ch <= fbw_channels; ch++) {
763
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 7368 if (s->channel_uses_spx[ch]) {
764
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 7368 if (s->first_spx_coords[ch] || get_bits1(bc)) {
765 INTFLOAT spx_blend;
766 int bin, master_spx_coord;
767
768 1967 s->first_spx_coords[ch] = 0;
769 1967 spx_blend = AC3_SPX_BLEND(get_bits(bc, 5));
770 1967 master_spx_coord = get_bits(bc, 2) * 3;
771
772 1967 bin = s->spx_src_start_freq;
773
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 6900 for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
774 4933 int bandsize = s->spx_band_sizes[bnd];
775 int spx_coord_exp, spx_coord_mant;
776 INTFLOAT nratio, sblend, nblend;
777 #if USE_FIXED
778 /* calculate blending factors */
779 ✗ int64_t accu = ((bin << 23) + (bandsize << 22))
780 ✗ * (int64_t)s->spx_dst_end_freq;
781 ✗ nratio = (int)(accu >> 32);
782 ✗ nratio -= spx_blend << 18;
783
784 ✗ if (nratio < 0) {
785 ✗ nblend = 0;
786 ✗ sblend = 0x800000;
787 ✗ } else if (nratio > 0x7fffff) {
788 ✗ nblend = 14529495; // sqrt(3) in FP.23
789 ✗ sblend = 0;
790 } else {
791 ✗ nblend = fixed_sqrt(nratio, 23);
792 ✗ accu = (int64_t)nblend * 1859775393;
793 ✗ nblend = (int)((accu + (1<<29)) >> 30);
794 ✗ sblend = fixed_sqrt(0x800000 - nratio, 23);
795 }
796 #else
797 float spx_coord;
798
799 /* calculate blending factors */
800 4933 nratio = ((float)((bin + (bandsize >> 1))) / s->spx_dst_end_freq) - spx_blend;
801 4933 nratio = av_clipf(nratio, 0.0f, 1.0f);
802 4933 nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3)
803 // to give unity variance
804 4933 sblend = sqrtf(1.0f - nratio);
805 #endif
806 4933 bin += bandsize;
807
808 /* decode spx coordinates */
809 4933 spx_coord_exp = get_bits(bc, 4);
810 4933 spx_coord_mant = get_bits(bc, 2);
811
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 4933 if (spx_coord_exp == 15) spx_coord_mant <<= 1;
812 4215 else spx_coord_mant += 4;
813 4933 spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
814
815 /* multiply noise and signal blending factors by spx coordinate */
816 #if USE_FIXED
817 ✗ accu = (int64_t)nblend * spx_coord_mant;
818 ✗ s->spx_noise_blend[ch][bnd] = (int)((accu + (1<<22)) >> 23);
819 ✗ accu = (int64_t)sblend * spx_coord_mant;
820 ✗ s->spx_signal_blend[ch][bnd] = (int)((accu + (1<<22)) >> 23);
821 #else
822 4933 spx_coord = spx_coord_mant * (1.0f / (1 << 23));
823 4933 s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
824 4933 s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
825 #endif
826 }
827 }
828 } else {
829 ✗ s->first_spx_coords[ch] = 1;
830 }
831 }
832 3252 }
833
834 2469 static inline int coupling_strategy(AC3DecodeContext *s, int blk,
835 uint8_t *bit_alloc_stages)
836 {
837 2469 GetBitContext *bc = &s->gbc;
838 2469 int fbw_channels = s->fbw_channels;
839 2469 int channel_mode = s->channel_mode;
840 int ch;
841
842 2469 memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
843
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 2469 if (!s->eac3)
844 1265 s->cpl_in_use[blk] = get_bits1(bc);
845
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 2469 if (s->cpl_in_use[blk]) {
846 /* coupling in use */
847 int cpl_start_subband, cpl_end_subband;
848
849
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 1249 if (channel_mode < AC3_CHMODE_STEREO) {
850 ✗ av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
851 ✗ return AVERROR_INVALIDDATA;
852 }
853
854 /* check for enhanced coupling */
855
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 1249 if (s->eac3 && get_bits1(bc)) {
856 /* TODO: parse enhanced coupling strategy info */
857 ✗ avpriv_request_sample(s->avctx, "Enhanced coupling");
858 ✗ return AVERROR_PATCHWELCOME;
859 }
860
861 /* determine which channels are coupled */
862
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 1249 if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
863 405 s->channel_in_cpl[1] = 1;
864 405 s->channel_in_cpl[2] = 1;
865 } else {
866
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 3393 for (ch = 1; ch <= fbw_channels; ch++)
867 2549 s->channel_in_cpl[ch] = get_bits1(bc);
868 }
869
870 /* phase flags in use */
871
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 1249 if (channel_mode == AC3_CHMODE_STEREO)
872 962 s->phase_flags_in_use = get_bits1(bc);
873
874 /* coupling frequency range */
875 1249 cpl_start_subband = get_bits(bc, 4);
876
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 1249 cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
877 1249 get_bits(bc, 4) + 3;
878
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 1249 if (cpl_start_subband >= cpl_end_subband) {
879 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
880 cpl_start_subband, cpl_end_subband);
881 ✗ return AVERROR_INVALIDDATA;
882 }
883 1249 s->start_freq[CPL_CH] = cpl_start_subband * 12 + 37;
884 1249 s->end_freq[CPL_CH] = cpl_end_subband * 12 + 37;
885
886 1249 decode_band_structure(bc, blk, s->eac3, 0, cpl_start_subband,
887 cpl_end_subband,
888 ff_eac3_default_cpl_band_struct,
889 1249 &s->num_cpl_bands, s->cpl_band_sizes,
890 1249 s->cpl_band_struct, sizeof(s->cpl_band_struct));
891 } else {
892 /* coupling not in use */
893
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 5409 for (ch = 1; ch <= fbw_channels; ch++) {
894 4189 s->channel_in_cpl[ch] = 0;
895 4189 s->first_cpl_coords[ch] = 1;
896 }
897 1220 s->first_cpl_leak = s->eac3;
898 1220 s->phase_flags_in_use = 0;
899 }
900
901 2469 return 0;
902 }
903
904 7490 static inline int coupling_coordinates(AC3DecodeContext *s, int blk)
905 {
906 7490 GetBitContext *bc = &s->gbc;
907 7490 int fbw_channels = s->fbw_channels;
908 int ch, bnd;
909 7490 int cpl_coords_exist = 0;
910
911
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 27636 for (ch = 1; ch <= fbw_channels; ch++) {
912
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 20146 if (s->channel_in_cpl[ch]) {
913
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 26092 if ((s->eac3 && s->first_cpl_coords[ch]) || get_bits1(bc)) {
914 int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
915 5946 s->first_cpl_coords[ch] = 0;
916 5946 cpl_coords_exist = 1;
917 5946 master_cpl_coord = 3 * get_bits(bc, 2);
918
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 21743 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
919 15797 cpl_coord_exp = get_bits(bc, 4);
920 15797 cpl_coord_mant = get_bits(bc, 4);
921
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 15797 if (cpl_coord_exp == 15)
922 2610 s->cpl_coords[ch][bnd] = cpl_coord_mant << 22;
923 else
924 13187 s->cpl_coords[ch][bnd] = (cpl_coord_mant + 16) << 21;
925 15797 s->cpl_coords[ch][bnd] >>= (cpl_coord_exp + master_cpl_coord);
926 }
927
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 14200 } else if (!blk) {
928 ✗ av_log(s->avctx, AV_LOG_ERROR, "new coupling coordinates must "
929 "be present in block 0\n");
930 ✗ return AVERROR_INVALIDDATA;
931 }
932 } else {
933 /* channel not in coupling */
934 ✗ s->first_cpl_coords[ch] = 1;
935 }
936 }
937 /* phase flags */
938
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 7490 if (s->channel_mode == AC3_CHMODE_STEREO && cpl_coords_exist) {
939
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 4959 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
940
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 3967 s->phase_flags[bnd] = s->phase_flags_in_use ? get_bits1(bc) : 0;
941 }
942 }
943
944 7490 return 0;
945 }
946
947 /**
948 * Decode a single audio block from the AC-3 bitstream.
949 */
950 14312 static int decode_audio_block(AC3DecodeContext *s, int blk, int offset)
951 {
952 14312 int fbw_channels = s->fbw_channels;
953 14312 int channel_mode = s->channel_mode;
954 int i, bnd, seg, ch, ret;
955 int different_transforms;
956 int downmix_output;
957 int cpl_in_use;
958 14312 GetBitContext *gbc = &s->gbc;
959 14312 uint8_t bit_alloc_stages[AC3_MAX_CHANNELS] = { 0 };
960
961 /* block switch flags */
962 14312 different_transforms = 0;
963
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 14312 if (s->block_switch_syntax) {
964
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 33858 for (ch = 1; ch <= fbw_channels; ch++) {
965 26280 s->block_switch[ch] = get_bits1(gbc);
966
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 26280 if (ch > 1 && s->block_switch[ch] != s->block_switch[1])
967 6 different_transforms = 1;
968 }
969 }
970
971 /* dithering flags */
972
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 14312 if (s->dither_flag_syntax) {
973
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 33858 for (ch = 1; ch <= fbw_channels; ch++) {
974 26280 s->dither_flag[ch] = get_bits1(gbc);
975 }
976 }
977
978 /* dynamic range */
979 14312 i = !s->channel_mode;
980 do {
981
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 14312 if (get_bits1(gbc)) {
982 /* Allow asymmetric application of DRC when drc_scale > 1.
983 Amplification of quiet sounds is enhanced */
984 2767 int range_bits = get_bits(gbc, 8);
985 2767 INTFLOAT range = AC3_RANGE(range_bits);
986
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 2767 if (range_bits <= 127 || s->drc_scale <= 1.0)
987 2669 s->dynamic_range[i] = AC3_DYNAMIC_RANGE(range);
988 else
989 98 s->dynamic_range[i] = range;
990
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 11545 } else if (blk == 0) {
991 712 s->dynamic_range[i] = AC3_DYNAMIC_RANGE1;
992 }
993
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 14312 } while (i--);
994
995 /* spectral extension strategy */
996
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 14312 if (s->eac3 && (!blk || get_bits1(gbc))) {
997 1204 s->spx_in_use = get_bits1(gbc);
998
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 1204 if (s->spx_in_use) {
999
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 542 if ((ret = spx_strategy(s, blk)) < 0)
1000 ✗ return ret;
1001 }
1002 }
1003
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 14312 if (!s->eac3 || !s->spx_in_use) {
1004 11060 s->spx_in_use = 0;
1005
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 46506 for (ch = 1; ch <= fbw_channels; ch++) {
1006 35446 s->channel_uses_spx[ch] = 0;
1007 35446 s->first_spx_coords[ch] = 1;
1008 }
1009 }
1010
1011 /* spectral extension coordinates */
1012
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 14312 if (s->spx_in_use)
1013 3252 spx_coordinates(s);
1014
1015 /* coupling strategy */
1016
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 14312 if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) {
1017
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 2469 if ((ret = coupling_strategy(s, blk, bit_alloc_stages)) < 0)
1018 ✗ return ret;
1019
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 11843 } else if (!s->eac3) {
1020
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 6313 if (!blk) {
1021 ✗ av_log(s->avctx, AV_LOG_ERROR, "new coupling strategy must "
1022 "be present in block 0\n");
1023 ✗ return AVERROR_INVALIDDATA;
1024 } else {
1025 6313 s->cpl_in_use[blk] = s->cpl_in_use[blk-1];
1026 }
1027 }
1028 14312 cpl_in_use = s->cpl_in_use[blk];
1029
1030 /* coupling coordinates */
1031
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 14312 if (cpl_in_use) {
1032
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 7490 if ((ret = coupling_coordinates(s, blk)) < 0)
1033 ✗ return ret;
1034 }
1035
1036 /* stereo rematrixing strategy and band structure */
1037
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 14312 if (channel_mode == AC3_CHMODE_STEREO) {
1038
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 8736 if ((s->eac3 && !blk) || get_bits1(gbc)) {
1039 2864 s->num_rematrixing_bands = 4;
1040
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 2864 if (cpl_in_use && s->start_freq[CPL_CH] <= 61) {
1041
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 1 s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37);
1042
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 2863 } else if (s->spx_in_use && s->spx_src_start_freq <= 61) {
1043 ✗ s->num_rematrixing_bands--;
1044 }
1045
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 14318 for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++)
1046 11454 s->rematrixing_flags[bnd] = get_bits1(gbc);
1047
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 5872 } else if (!blk) {
1048 ✗ av_log(s->avctx, AV_LOG_WARNING, "Warning: "
1049 "new rematrixing strategy not present in block 0\n");
1050 ✗ s->num_rematrixing_bands = 0;
1051 }
1052 }
1053
1054 /* exponent strategies for each channel */
1055
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 67708 for (ch = !cpl_in_use; ch <= s->channels; ch++) {
1056
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 53396 if (!s->eac3)
1057
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 34046 s->exp_strategy[blk][ch] = get_bits(gbc, 2 - (ch == s->lfe_ch));
1058
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 53396 if (s->exp_strategy[blk][ch] != EXP_REUSE)
1059 13652 bit_alloc_stages[ch] = 3;
1060 }
1061
1062 /* channel bandwidth */
1063
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 57126 for (ch = 1; ch <= fbw_channels; ch++) {
1064 42814 s->start_freq[ch] = 0;
1065
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 42814 if (s->exp_strategy[blk][ch] != EXP_REUSE) {
1066 int group_size;
1067 10584 int prev = s->end_freq[ch];
1068
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 10584 if (s->channel_in_cpl[ch])
1069 4200 s->end_freq[ch] = s->start_freq[CPL_CH];
1070
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 6384 else if (s->channel_uses_spx[ch])
1071 1967 s->end_freq[ch] = s->spx_src_start_freq;
1072 else {
1073 4417 int bandwidth_code = get_bits(gbc, 6);
1074
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 4417 if (bandwidth_code > 60) {
1075 ✗ av_log(s->avctx, AV_LOG_ERROR, "bandwidth code = %d > 60\n", bandwidth_code);
1076 ✗ return AVERROR_INVALIDDATA;
1077 }
1078 4417 s->end_freq[ch] = bandwidth_code * 3 + 73;
1079 }
1080 10584 group_size = 3 << (s->exp_strategy[blk][ch] - 1);
1081 10584 s->num_exp_groups[ch] = (s->end_freq[ch] + group_size-4) / group_size;
1082
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 10584 if (blk > 0 && s->end_freq[ch] != prev)
1083 4 memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
1084 }
1085 }
1086
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 14312 if (cpl_in_use && s->exp_strategy[blk][CPL_CH] != EXP_REUSE) {
1087 2439 s->num_exp_groups[CPL_CH] = (s->end_freq[CPL_CH] - s->start_freq[CPL_CH]) /
1088 2439 (3 << (s->exp_strategy[blk][CPL_CH] - 1));
1089 }
1090
1091 /* decode exponents for each channel */
1092
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 67708 for (ch = !cpl_in_use; ch <= s->channels; ch++) {
1093
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 53396 if (s->exp_strategy[blk][ch] != EXP_REUSE) {
1094 13652 s->dexps[ch][0] = get_bits(gbc, 4) << !ch;
1095
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 13652 if (decode_exponents(s, gbc, s->exp_strategy[blk][ch],
1096 13652 s->num_exp_groups[ch], s->dexps[ch][0],
1097 13652 &s->dexps[ch][s->start_freq[ch]+!!ch])) {
1098 ✗ return AVERROR_INVALIDDATA;
1099 }
1100
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 13652 if (ch != CPL_CH && ch != s->lfe_ch)
1101 10584 skip_bits(gbc, 2); /* skip gainrng */
1102 }
1103 }
1104
1105 /* bit allocation information */
1106
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 14312 if (s->bit_allocation_syntax) {
1107
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 8804 if (get_bits1(gbc)) {
1108 1583 s->bit_alloc_params.slow_decay = ff_ac3_slow_decay_tab[get_bits(gbc, 2)] >> s->bit_alloc_params.sr_shift;
1109 1583 s->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gbc, 2)] >> s->bit_alloc_params.sr_shift;
1110 1583 s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)];
1111 1583 s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)];
1112 1583 s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)];
1113
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 8681 for (ch = !cpl_in_use; ch <= s->channels; ch++)
1114 7098 bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
1115
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 7221 } else if (!blk) {
1116 ✗ av_log(s->avctx, AV_LOG_ERROR, "new bit allocation info must "
1117 "be present in block 0\n");
1118 ✗ return AVERROR_INVALIDDATA;
1119 }
1120 }
1121
1122 /* signal-to-noise ratio offsets and fast gains (signal-to-mask ratios) */
1123
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 14312 if (!s->eac3 || !blk) {
1124
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✓ Branch 4 taken 6315 times.
 10045 if (s->snr_offset_strategy && get_bits1(gbc)) {
1125 1263 int snr = 0;
1126 int csnr;
1127 1263 csnr = (get_bits(gbc, 6) - 15) << 4;
1128
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 6938 for (i = ch = !cpl_in_use; ch <= s->channels; ch++) {
1129 /* snr offset */
1130
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✗ Branch 3 not taken.
 5675 if (ch == i || s->snr_offset_strategy == 2)
1131 5675 snr = (csnr + get_bits(gbc, 4)) << 2;
1132 /* run at least last bit allocation stage if snr offset changes */
1133
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 5675 if (blk && s->snr_offset[ch] != snr) {
1134 ✗ bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 1);
1135 }
1136 5675 s->snr_offset[ch] = snr;
1137
1138 /* fast gain (normal AC-3 only) */
1139
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 5675 if (!s->eac3) {
1140 5675 int prev = s->fast_gain[ch];
1141 5675 s->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)];
1142 /* run last 2 bit allocation stages if fast gain changes */
1143
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 5675 if (blk && prev != s->fast_gain[ch])
1144 ✗ bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
1145 }
1146 }
1147
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 7519 } else if (!s->eac3 && !blk) {
1148 ✗ av_log(s->avctx, AV_LOG_ERROR, "new snr offsets must be present in block 0\n");
1149 ✗ return AVERROR_INVALIDDATA;
1150 }
1151 }
1152
1153 /* fast gain (E-AC-3 only) */
1154
3/4
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 14312 if (s->fast_gain_syntax && get_bits1(gbc)) {
1155
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 4770 for (ch = !cpl_in_use; ch <= s->channels; ch++) {
1156 3816 int prev = s->fast_gain[ch];
1157 3816 s->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)];
1158 /* run last 2 bit allocation stages if fast gain changes */
1159
3/4
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 3816 if (blk && prev != s->fast_gain[ch])
1160 ✗ bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
1161 }
1162
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 13358 } else if (s->eac3 && !blk) {
1163
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 4124 for (ch = !cpl_in_use; ch <= s->channels; ch++)
1164 3079 s->fast_gain[ch] = ff_ac3_fast_gain_tab[4];
1165 }
1166
1167 /* E-AC-3 to AC-3 converter SNR offset */
1168
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 14312 if (s->frame_type == EAC3_FRAME_TYPE_INDEPENDENT && get_bits1(gbc)) {
1169 689 skip_bits(gbc, 10); // skip converter snr offset
1170 }
1171
1172 /* coupling leak information */
1173
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 14312 if (cpl_in_use) {
1174
4/4
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✓ Branch 4 taken 6195 times.
 7490 if (s->first_cpl_leak || get_bits1(gbc)) {
1175 1295 int fl = get_bits(gbc, 3);
1176 1295 int sl = get_bits(gbc, 3);
1177 /* run last 2 bit allocation stages for coupling channel if
1178 coupling leak changes */
1179
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 1295 if (blk && (fl != s->bit_alloc_params.cpl_fast_leak ||
1180
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 1 sl != s->bit_alloc_params.cpl_slow_leak)) {
1181 46 bit_alloc_stages[CPL_CH] = FFMAX(bit_alloc_stages[CPL_CH], 2);
1182 }
1183 1295 s->bit_alloc_params.cpl_fast_leak = fl;
1184 1295 s->bit_alloc_params.cpl_slow_leak = sl;
1185
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 6195 } else if (!s->eac3 && !blk) {
1186 ✗ av_log(s->avctx, AV_LOG_ERROR, "new coupling leak info must "
1187 "be present in block 0\n");
1188 ✗ return AVERROR_INVALIDDATA;
1189 }
1190 7490 s->first_cpl_leak = 0;
1191 }
1192
1193 /* delta bit allocation information */
1194
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 14312 if (s->dba_syntax && get_bits1(gbc)) {
1195 /* delta bit allocation exists (strategy) */
1196 ✗ for (ch = !cpl_in_use; ch <= fbw_channels; ch++) {
1197 ✗ s->dba_mode[ch] = get_bits(gbc, 2);
1198 ✗ if (s->dba_mode[ch] == DBA_RESERVED) {
1199 ✗ av_log(s->avctx, AV_LOG_ERROR, "delta bit allocation strategy reserved\n");
1200 ✗ return AVERROR_INVALIDDATA;
1201 }
1202 ✗ bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
1203 }
1204 /* channel delta offset, len and bit allocation */
1205 ✗ for (ch = !cpl_in_use; ch <= fbw_channels; ch++) {
1206 ✗ if (s->dba_mode[ch] == DBA_NEW) {
1207 ✗ s->dba_nsegs[ch] = get_bits(gbc, 3) + 1;
1208 ✗ for (seg = 0; seg < s->dba_nsegs[ch]; seg++) {
1209 ✗ s->dba_offsets[ch][seg] = get_bits(gbc, 5);
1210 ✗ s->dba_lengths[ch][seg] = get_bits(gbc, 4);
1211 ✗ s->dba_values[ch][seg] = get_bits(gbc, 3);
1212 }
1213 /* run last 2 bit allocation stages if new dba values */
1214 ✗ bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
1215 }
1216 }
1217
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 14312 } else if (blk == 0) {
1218
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 13075 for (ch = 0; ch <= s->channels; ch++) {
1219 10608 s->dba_mode[ch] = DBA_NONE;
1220 }
1221 }
1222
1223 /* Bit allocation */
1224
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 67708 for (ch = !cpl_in_use; ch <= s->channels; ch++) {
1225
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 53396 if (bit_alloc_stages[ch] > 2) {
1226 /* Exponent mapping into PSD and PSD integration */
1227 13652 ff_ac3_bit_alloc_calc_psd(s->dexps[ch],
1228 s->start_freq[ch], s->end_freq[ch],
1229 13652 s->psd[ch], s->band_psd[ch]);
1230 }
1231
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 53396 if (bit_alloc_stages[ch] > 1) {
1232 /* Compute excitation function, Compute masking curve, and
1233 Apply delta bit allocation */
1234
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 13794 if (ff_ac3_bit_alloc_calc_mask(&s->bit_alloc_params, s->band_psd[ch],
1235 s->start_freq[ch], s->end_freq[ch],
1236 13794 s->fast_gain[ch], (ch == s->lfe_ch),
1237 s->dba_mode[ch], s->dba_nsegs[ch],
1238 13794 s->dba_offsets[ch], s->dba_lengths[ch],
1239 13794 s->dba_values[ch], s->mask[ch])) {
1240 ✗ av_log(s->avctx, AV_LOG_ERROR, "error in bit allocation\n");
1241 ✗ return AVERROR_INVALIDDATA;
1242 }
1243 }
1244
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 53396 if (bit_alloc_stages[ch] > 0) {
1245 /* Compute bit allocation */
1246 27588 const uint8_t *bap_tab = s->channel_uses_aht[ch] ?
1247
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 13794 ff_eac3_hebap_tab : ff_ac3_bap_tab;
1248 13794 s->ac3dsp.bit_alloc_calc_bap(s->mask[ch], s->psd[ch],
1249 s->start_freq[ch], s->end_freq[ch],
1250 s->snr_offset[ch],
1251 s->bit_alloc_params.floor,
1252 13794 bap_tab, s->bap[ch]);
1253 }
1254 }
1255
1256 /* unused dummy data */
1257
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 14312 if (s->skip_syntax && get_bits1(gbc)) {
1258 1279 int skipl = get_bits(gbc, 9);
1259 1279 skip_bits_long(gbc, 8 * skipl);
1260 }
1261
1262 /* unpack the transform coefficients
1263 this also uncouples channels if coupling is in use. */
1264 14312 decode_transform_coeffs(s, blk);
1265
1266 /* TODO: generate enhanced coupling coordinates and uncouple */
1267
1268 /* recover coefficients if rematrixing is in use */
1269
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 14312 if (s->channel_mode == AC3_CHMODE_STEREO)
1270 8736 do_rematrixing(s);
1271
1272 /* apply scaling to coefficients (headroom, dynrng) */
1273
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 60218 for (ch = 1; ch <= s->channels; ch++) {
1274 45906 int audio_channel = 0;
1275 INTFLOAT gain;
1276
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 45906 if (s->channel_mode == AC3_CHMODE_DUALMONO && ch <= 2)
1277 ✗ audio_channel = 2-ch;
1278
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 45906 if (s->heavy_compression && s->compression_exists[audio_channel])
1279 ✗ gain = s->heavy_dynamic_range[audio_channel];
1280 else
1281 45906 gain = s->dynamic_range[audio_channel];
1282
1283 #if USE_FIXED
1284 7008 scale_coefs(s->transform_coeffs[ch], s->fixed_coeffs[ch], gain, 256);
1285 #else
1286
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 38898 if (s->target_level != 0)
1287 ✗ gain = gain * s->level_gain[audio_channel];
1288 38898 gain *= 1.0 / 4194304.0f;
1289 38898 s->fmt_conv.int32_to_float_fmul_scalar(s->transform_coeffs[ch],
1290 38898 s->fixed_coeffs[ch], gain, 256);
1291 #endif
1292 }
1293
1294 /* apply spectral extension to high frequency bins */
1295
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 14312 if (CONFIG_EAC3_DECODER && s->spx_in_use) {
1296 3252 ff_eac3_apply_spectral_extension(s);
1297 }
1298
1299 /* downmix and MDCT. order depends on whether block switching is used for
1300 any channel in this block. this is because coefficients for the long
1301 and short transforms cannot be mixed. */
1302
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 16790 downmix_output = s->channels != s->out_channels &&
1303
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 2478 !((s->output_mode & AC3_OUTPUT_LFEON) &&
1304 ✗ s->fbw_channels == s->out_channels);
1305
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 14312 if (different_transforms) {
1306 /* the delay samples have already been downmixed, so we upmix the delay
1307 samples in order to reconstruct all channels before downmixing. */
1308
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✗ Branch 1 not taken.
 6 if (s->downmixed) {
1309 6 s->downmixed = 0;
1310 6 ac3_upmix_delay(s);
1311 }
1312
1313 6 do_imdct(s, s->channels, offset);
1314
1315
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 6 if (downmix_output) {
1316 #if USE_FIXED
1317 1 ac3_downmix_c_fixed16(s->outptr, s->downmix_coeffs,
1318 s->out_channels, s->fbw_channels, 256);
1319 #else
1320 2 ff_ac3dsp_downmix(&s->ac3dsp, s->outptr, s->downmix_coeffs,
1321 s->out_channels, s->fbw_channels, 256);
1322 #endif
1323 }
1324 } else {
1325
2/2
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 14306 if (downmix_output) {
1326 2475 AC3_RENAME(ff_ac3dsp_downmix)(&s->ac3dsp, s->xcfptr + 1, s->downmix_coeffs,
1327 s->out_channels, s->fbw_channels, 256);
1328 }
1329
1330
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 14306 if (downmix_output && !s->downmixed) {
1331 3 s->downmixed = 1;
1332 3 AC3_RENAME(ff_ac3dsp_downmix)(&s->ac3dsp, s->dlyptr, s->downmix_coeffs,
1333 s->out_channels, s->fbw_channels, 128);
1334 }
1335
1336 14306 do_imdct(s, s->out_channels, offset);
1337 }
1338
1339 14312 return 0;
1340 }
1341
1342 /**
1343 * Decode a single AC-3 frame.
1344 */
1345 2319 static int ac3_decode_frame(AVCodecContext *avctx, AVFrame *frame,
1346 int *got_frame_ptr, AVPacket *avpkt)
1347 {
1348 2319 const uint8_t *buf = avpkt->data;
1349 2319 int buf_size, full_buf_size = avpkt->size;
1350 2319 AC3DecodeContext *s = avctx->priv_data;
1351 int blk, ch, err, offset, ret;
1352 int i;
1353 2319 int skip = 0, got_independent_frame = 0;
1354 const uint8_t *channel_map;
1355 uint8_t extended_channel_map[EAC3_MAX_CHANNELS];
1356 const SHORTFLOAT *output[AC3_MAX_CHANNELS];
1357 enum AVMatrixEncoding matrix_encoding;
1358 uint64_t mask;
1359
1360 2319 s->superframe_size = 0;
1361
1362 2319 buf_size = full_buf_size;
1363 2319 i = ff_ac3_find_syncword(buf, buf_size);
1364
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 2319 if (i < 0 || i > 10)
1365 4 return i;
1366 2315 buf += i;
1367 2315 buf_size -= i;
1368
1369 /* copy input buffer to decoder context to avoid reading past the end
1370 of the buffer, which can be caused by a damaged input stream. */
1371
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 2315 if (buf_size >= 2 && AV_RB16(buf) == 0x770B) {
1372 // seems to be byte-swapped AC-3
1373 ✗ int cnt = FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE) >> 1;
1374 ✗ s->bdsp.bswap16_buf((uint16_t *) s->input_buffer,
1375 (const uint16_t *) buf, cnt);
1376 } else
1377 2315 memcpy(s->input_buffer, buf, FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE));
1378
1379 /* if consistent noise generation is enabled, seed the linear feedback generator
1380 * with the contents of the AC-3 frame so that the noise is identical across
1381 * decodes given the same AC-3 frame data, for use with non-linear edititing software. */
1382
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 2315 if (s->consistent_noise_generation)
1383 ✗ av_lfg_init_from_data(&s->dith_state, s->input_buffer, FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE));
1384
1385 2315 buf = s->input_buffer;
1386 2474 dependent_frame:
1387 /* initialize the GetBitContext with the start of valid AC-3 Frame */
1388
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 2474 if ((ret = init_get_bits8(&s->gbc, buf, buf_size)) < 0)
1389 ✗ return ret;
1390
1391 /* parse the syncinfo */
1392 2474 err = parse_frame_header(s);
1393
1394
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 2474 if (err) {
1395 ✗ switch (err) {
1396 ✗ case AC3_PARSE_ERROR_SYNC:
1397 ✗ av_log(avctx, AV_LOG_ERROR, "frame sync error\n");
1398 ✗ return AVERROR_INVALIDDATA;
1399 ✗ case AC3_PARSE_ERROR_BSID:
1400 ✗ av_log(avctx, AV_LOG_ERROR, "invalid bitstream id\n");
1401 ✗ break;
1402 ✗ case AC3_PARSE_ERROR_SAMPLE_RATE:
1403 ✗ av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
1404 ✗ break;
1405 ✗ case AC3_PARSE_ERROR_FRAME_SIZE:
1406 ✗ av_log(avctx, AV_LOG_ERROR, "invalid frame size\n");
1407 ✗ break;
1408 ✗ case AC3_PARSE_ERROR_FRAME_TYPE:
1409 /* skip frame if CRC is ok. otherwise use error concealment. */
1410 /* TODO: add support for substreams */
1411 ✗ if (s->substreamid) {
1412 ✗ av_log(avctx, AV_LOG_DEBUG,
1413 "unsupported substream %d: skipping frame\n",
1414 s->substreamid);
1415 ✗ *got_frame_ptr = 0;
1416 ✗ return buf_size;
1417 } else {
1418 ✗ av_log(avctx, AV_LOG_ERROR, "invalid frame type\n");
1419 }
1420 ✗ break;
1421 ✗ case AC3_PARSE_ERROR_CHANNEL_MAP:
1422 ✗ av_log(avctx, AV_LOG_ERROR, "invalid channel map\n");
1423 ✗ return AVERROR_INVALIDDATA;
1424 ✗ case AC3_PARSE_ERROR_CRC:
1425 ✗ break;
1426 ✗ default: // Normal AVERROR do not try to recover.
1427 ✗ *got_frame_ptr = 0;
1428 ✗ return err;
1429 }
1430 } else {
1431 /* check that reported frame size fits in input buffer */
1432
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 2474 if (s->frame_size > buf_size) {
1433 7 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
1434 7 err = AC3_PARSE_ERROR_FRAME_SIZE;
1435
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 2467 } else if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
1436 /* check for crc mismatch */
1437 ✗ if (av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2],
1438 ✗ s->frame_size - 2)) {
1439 ✗ av_log(avctx, AV_LOG_ERROR, "frame CRC mismatch\n");
1440 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
1441 ✗ return AVERROR_INVALIDDATA;
1442 ✗ err = AC3_PARSE_ERROR_CRC;
1443 }
1444 }
1445 }
1446
1447
3/4
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 2474 if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT && !got_independent_frame) {
1448 ✗ av_log(avctx, AV_LOG_WARNING, "Ignoring dependent frame without independent frame.\n");
1449 ✗ *got_frame_ptr = 0;
1450 ✗ return FFMIN(full_buf_size, s->frame_size);
1451 }
1452
1453 /* channel config */
1454
5/6
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 2474 if (!err || (s->channels && s->out_channels != s->channels)) {
1455 2471 s->out_channels = s->channels;
1456 2471 s->output_mode = s->channel_mode;
1457
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 2471 if (s->lfe_on)
1458 601 s->output_mode |= AC3_OUTPUT_LFEON;
1459
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✓ Branch 3 taken 2228 times.
 4939 if (s->channels > 1 &&
1460 2468 !av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_MONO)) {
1461 240 s->out_channels = 1;
1462 240 s->output_mode = AC3_CHMODE_MONO;
1463
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 3003 } else if (s->channels > 2 &&
1464 772 !av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) {
1465 177 s->out_channels = 2;
1466 177 s->output_mode = AC3_CHMODE_STEREO;
1467 }
1468
1469 2471 s->loro_center_mix_level = ff_ac3_gain_levels[s-> center_mix_level];
1470 2471 s->loro_surround_mix_level = ff_ac3_gain_levels[s->surround_mix_level];
1471 2471 s->ltrt_center_mix_level = ff_ac3_gain_levels[s-> center_mix_level_ltrt];
1472 2471 s->ltrt_surround_mix_level = ff_ac3_gain_levels[s->surround_mix_level_ltrt];
1473
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 2471 switch (s->preferred_downmix) {
1474 48 case AC3_DMIXMOD_LTRT:
1475 48 s->preferred_stereo_downmix = AV_DOWNMIX_TYPE_LTRT;
1476 48 break;
1477 ✗ case AC3_DMIXMOD_LORO:
1478 ✗ s->preferred_stereo_downmix = AV_DOWNMIX_TYPE_LORO;
1479 ✗ break;
1480 98 case AC3_DMIXMOD_DPLII:
1481 98 s->preferred_stereo_downmix = AV_DOWNMIX_TYPE_DPLII;
1482 98 break;
1483 2325 default:
1484 2325 s->preferred_stereo_downmix = AV_DOWNMIX_TYPE_UNKNOWN;
1485 2325 break;
1486 }
1487 /* set downmixing coefficients if needed */
1488
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 2471 if (s->channels != s->out_channels && !((s->output_mode & AC3_OUTPUT_LFEON) &&
1489 ✗ s->fbw_channels == s->out_channels)) {
1490
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✓ Branch 2 taken 417 times.
 417 if ((ret = set_downmix_coeffs(s)) < 0) {
1491 ✗ av_log(avctx, AV_LOG_ERROR, "error setting downmix coeffs\n");
1492 ✗ return ret;
1493 }
1494 }
1495
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✓ Branch 1 taken 3 times.
 3 } else if (!s->channels) {
1496 ✗ av_log(avctx, AV_LOG_ERROR, "unable to determine channel mode\n");
1497 ✗ return AVERROR_INVALIDDATA;
1498 }
1499
1500 2474 mask = ff_ac3_channel_layout_tab[s->output_mode & ~AC3_OUTPUT_LFEON];
1501
2/2
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 2474 if (s->output_mode & AC3_OUTPUT_LFEON)
1502 374 mask |= AV_CH_LOW_FREQUENCY;
1503
1504 2474 av_channel_layout_uninit(&avctx->ch_layout);
1505 2474 av_channel_layout_from_mask(&avctx->ch_layout, mask);
1506
1507 /* set audio service type based on bitstream mode for AC-3 */
1508 2474 avctx->audio_service_type = s->bitstream_mode;
1509
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 2474 if (s->bitstream_mode == 0x7 && s->channels > 1)
1510 ✗ avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
1511
1512 /* decode the audio blocks */
1513 2474 channel_map = ff_ac3_dec_channel_map[s->output_mode & ~AC3_OUTPUT_LFEON][s->lfe_on];
1514
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 2474 offset = s->frame_type == EAC3_FRAME_TYPE_DEPENDENT ? AC3_MAX_CHANNELS : 0;
1515
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 19792 for (ch = 0; ch < AC3_MAX_CHANNELS; ch++) {
1516 17318 output[ch] = s->output[ch + offset];
1517 17318 s->outptr[ch] = s->output[ch + offset];
1518 }
1519
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 10649 for (ch = 0; ch < s->channels; ch++) {
1520
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✓ Branch 1 taken 1530 times.
 8175 if (ch < s->out_channels)
1521 6645 s->outptr[channel_map[ch]] = s->output_buffer[ch + offset];
1522 }
1523
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 16828 for (blk = 0; blk < s->num_blocks; blk++) {
1524
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✓ Branch 4 taken 14312 times.
 14354 if (!err && decode_audio_block(s, blk, offset)) {
1525 ✗ av_log(avctx, AV_LOG_ERROR, "error decoding the audio block\n");
1526 ✗ err = 1;
1527 }
1528
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 14354 if (err)
1529
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 138 for (ch = 0; ch < s->out_channels; ch++)
1530 96 memcpy(s->output_buffer[ch + offset] + AC3_BLOCK_SIZE*blk, output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT));
1531
2/2
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 51284 for (ch = 0; ch < s->out_channels; ch++)
1532 36930 output[ch] = s->outptr[channel_map[ch]];
1533
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 51284 for (ch = 0; ch < s->out_channels; ch++) {
1534
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✗ Branch 3 not taken.
 36930 if (!ch || channel_map[ch])
1535 36930 s->outptr[channel_map[ch]] += AC3_BLOCK_SIZE;
1536 }
1537 }
1538
1539 /* keep last block for error concealment in next frame */
1540
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 9119 for (ch = 0; ch < s->out_channels; ch++)
1541 6645 memcpy(s->output[ch + offset], output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT));
1542
1543 /* check if there is dependent frame */
1544
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 2474 if (buf_size > s->frame_size) {
1545 AC3HeaderInfo hdr;
1546 int err;
1547
1548
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 159 if (buf_size - s->frame_size <= 16) {
1549 ✗ skip = buf_size - s->frame_size;
1550 ✗ goto skip;
1551 }
1552
1553
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 159 if ((ret = init_get_bits8(&s->gbc, buf + s->frame_size, buf_size - s->frame_size)) < 0)
1554 ✗ return ret;
1555
1556 159 err = ff_ac3_parse_header(&s->gbc, &hdr);
1557
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 159 if (err)
1558 ✗ return err;
1559
1560
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✗ Branch 1 not taken.
 159 if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT) {
1561
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 159 if (hdr.num_blocks != s->num_blocks || s->sample_rate != hdr.sample_rate) {
1562 ✗ av_log(avctx, AV_LOG_WARNING, "Ignoring non-compatible dependent frame.\n");
1563 } else {
1564 159 buf += s->frame_size;
1565 159 buf_size -= s->frame_size;
1566 159 s->prev_output_mode = s->output_mode;
1567 159 s->prev_bit_rate = s->bit_rate;
1568 159 got_independent_frame = 1;
1569 159 goto dependent_frame;
1570 }
1571 }
1572 }
1573 2315 skip:
1574
1575 2315 frame->decode_error_flags = err ? FF_DECODE_ERROR_INVALID_BITSTREAM : 0;
1576
1577 /* if frame is ok, set audio parameters */
1578
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 2315 if (!err) {
1579 2308 avctx->sample_rate = s->sample_rate;
1580 2308 avctx->bit_rate = s->bit_rate + s->prev_bit_rate;
1581
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 2308 avctx->profile = s->eac3_extension_type_a == 1 ? AV_PROFILE_EAC3_DDP_ATMOS : AV_PROFILE_UNKNOWN;
1582 }
1583
1584
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 2315 if (!avctx->sample_rate) {
1585 ✗ av_log(avctx, AV_LOG_ERROR, "Could not determine the sample rate\n");
1586 ✗ return AVERROR_INVALIDDATA;
1587 }
1588
1589
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 39355 for (ch = 0; ch < EAC3_MAX_CHANNELS; ch++)
1590 37040 extended_channel_map[ch] = ch;
1591
1592
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 2315 if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT) {
1593 159 uint64_t ich_layout = ff_ac3_channel_layout_tab[s->prev_output_mode & ~AC3_OUTPUT_LFEON];
1594 159 int channel_map_size = ff_ac3_channels_tab[s->output_mode & ~AC3_OUTPUT_LFEON] + s->lfe_on;
1595 uint64_t channel_layout;
1596 159 int extend = 0;
1597
1598
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 159 if (s->prev_output_mode & AC3_OUTPUT_LFEON)
1599 159 ich_layout |= AV_CH_LOW_FREQUENCY;
1600
1601 159 channel_layout = ich_layout;
1602
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 2703 for (ch = 0; ch < 16; ch++) {
1603
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 2544 if (s->channel_map & (1 << (EAC3_MAX_CHANNELS - ch - 1))) {
1604 477 channel_layout |= ff_eac3_custom_channel_map_locations[ch][1];
1605 }
1606 }
1607
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 159 if (av_popcount64(channel_layout) > EAC3_MAX_CHANNELS) {
1608 ✗ av_log(avctx, AV_LOG_ERROR, "Too many channels (%d) coded\n",
1609 av_popcount64(channel_layout));
1610 ✗ return AVERROR_INVALIDDATA;
1611 }
1612
1613 159 av_channel_layout_uninit(&avctx->ch_layout);
1614 159 av_channel_layout_from_mask(&avctx->ch_layout, channel_layout);
1615
1616
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 2703 for (ch = 0; ch < EAC3_MAX_CHANNELS; ch++) {
1617
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 2544 if (s->channel_map & (1 << (EAC3_MAX_CHANNELS - ch - 1))) {
1618
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 477 if (ff_eac3_custom_channel_map_locations[ch][0]) {
1619 318 int index = av_channel_layout_index_from_channel(&avctx->ch_layout,
1620 318 ff_ctzll(ff_eac3_custom_channel_map_locations[ch][1]));
1621
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 318 if (index < 0)
1622 ✗ return AVERROR_INVALIDDATA;
1623
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 318 if (extend >= channel_map_size)
1624 ✗ break;
1625
1626 318 extended_channel_map[index] = offset + channel_map[extend++];
1627 } else {
1628 int i;
1629
1630
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 10335 for (i = 0; i < 64; i++) {
1631
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 10176 if ((1ULL << i) & ff_eac3_custom_channel_map_locations[ch][1]) {
1632 318 int index = av_channel_layout_index_from_channel(&avctx->ch_layout, i);
1633
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 318 if (index < 0)
1634 ✗ return AVERROR_INVALIDDATA;
1635
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 318 if (extend >= channel_map_size)
1636 ✗ break;
1637
1638 318 extended_channel_map[index] = offset + channel_map[extend++];
1639 }
1640 }
1641 }
1642 }
1643 }
1644
1645 159 ac3_downmix(avctx);
1646 }
1647
1648 /* get output buffer */
1649 2315 frame->nb_samples = s->num_blocks * AC3_BLOCK_SIZE;
1650
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 2315 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1651 ✗ return ret;
1652
1653
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 8642 for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
1654 6327 int map = extended_channel_map[ch];
1655
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 6327 av_assert0(ch>=AV_NUM_DATA_POINTERS || frame->extended_data[ch] == frame->data[ch]);
1656 6327 memcpy((SHORTFLOAT *)frame->extended_data[ch],
1657 6327 s->output_buffer[map],
1658 6327 s->num_blocks * AC3_BLOCK_SIZE * sizeof(SHORTFLOAT));
1659 }
1660
1661 /*
1662 * AVMatrixEncoding
1663 *
1664 * Check whether the input layout is compatible, and make sure we're not
1665 * downmixing (else the matrix encoding is no longer applicable).
1666 */
1667 2315 matrix_encoding = AV_MATRIX_ENCODING_NONE;
1668
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 2315 if (s->channel_mode == AC3_CHMODE_STEREO &&
1669
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 1458 s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
1670
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 1458 if (s->dolby_surround_mode == AC3_DSURMOD_ON)
1671 494 matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
1672
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 964 else if (s->dolby_headphone_mode == AC3_DHEADPHONMOD_ON)
1673 ✗ matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
1674
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 857 } else if (s->channel_mode >= AC3_CHMODE_2F2R &&
1675
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 443 s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
1676
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 215 switch (s->dolby_surround_ex_mode) {
1677 ✗ case AC3_DSUREXMOD_ON: // EX or PLIIx
1678 ✗ matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
1679 ✗ break;
1680 ✗ case AC3_DSUREXMOD_PLIIZ:
1681 ✗ matrix_encoding = AV_MATRIX_ENCODING_DPLIIZ;
1682 ✗ break;
1683 215 default: // not indicated or off
1684 215 break;
1685 }
1686 }
1687
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 2809 if (matrix_encoding != AV_MATRIX_ENCODING_NONE &&
1688 494 (ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
1689 ✗ return ret;
1690
1691 /* AVDownmixInfo */
1692
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 2315 if ( (s->channel_mode > AC3_CHMODE_STEREO) &&
1693
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 854 ((s->output_mode & ~AC3_OUTPUT_LFEON) > AC3_CHMODE_STEREO)) {
1694 437 AVDownmixInfo *downmix_info = av_downmix_info_update_side_data(frame);
1695
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 437 if (!downmix_info)
1696 ✗ return AVERROR(ENOMEM);
1697
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 437 switch (s->preferred_downmix) {
1698 48 case AC3_DMIXMOD_LTRT:
1699 48 downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LTRT;
1700 48 break;
1701 ✗ case AC3_DMIXMOD_LORO:
1702 ✗ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LORO;
1703 ✗ break;
1704 98 case AC3_DMIXMOD_DPLII:
1705 98 downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_DPLII;
1706 98 break;
1707 291 default:
1708 291 downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_UNKNOWN;
1709 291 break;
1710 }
1711 437 downmix_info->center_mix_level = ff_ac3_gain_levels[s-> center_mix_level];
1712 437 downmix_info->center_mix_level_ltrt = ff_ac3_gain_levels[s-> center_mix_level_ltrt];
1713 437 downmix_info->surround_mix_level = ff_ac3_gain_levels[s-> surround_mix_level];
1714 437 downmix_info->surround_mix_level_ltrt = ff_ac3_gain_levels[s->surround_mix_level_ltrt];
1715
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 437 if (s->lfe_mix_level_exists)
1716 146 downmix_info->lfe_mix_level = ff_eac3_gain_levels_lfe[s->lfe_mix_level];
1717 else
1718 291 downmix_info->lfe_mix_level = 0.0; // -inf dB
1719 }
1720
1721 2315 *got_frame_ptr = 1;
1722
1723
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 2315 if (!s->superframe_size)
1724 ✗ return FFMIN(full_buf_size, s->frame_size + skip);
1725
1726 2315 return FFMIN(full_buf_size, s->superframe_size + skip);
1727 }
1728
1729 /**
1730 * Uninitialize the AC-3 decoder.
1731 */
1732 101 static av_cold int ac3_decode_end(AVCodecContext *avctx)
1733 {
1734 101 AC3DecodeContext *s = avctx->priv_data;
1735 101 av_tx_uninit(&s->tx_256);
1736 101 av_tx_uninit(&s->tx_128);
1737 101 av_freep(&s->fdsp);
1738 101 av_freep(&s->downmix_coeffs[0]);
1739
1740 101 return 0;
1741 }
1742
1743 #define OFFSET(x) offsetof(AC3DecodeContext, x)
1744 #define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
1745