FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dcadec.c
Date: 2025-11-10 16:28:23
Exec Total Coverage
Lines: 150 202 74.3%
Functions: 7 8 87.5%
Branches: 96 160 60.0%
Line Branch Exec Source
1 /*
2 * Copyright (C) 2016 foo86
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/mem.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/channel_layout.h"
24 #include "libavutil/thread.h"
25
26 #include "codec_internal.h"
27 #include "dcadec.h"
28 #include "dcahuff.h"
29 #include "dca_syncwords.h"
30 #include "profiles.h"
31
32 #define MIN_PACKET_SIZE 16
33 #define MAX_PACKET_SIZE 0x104000
34
35 2484 int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask)
36 {
37 static const uint8_t dca2wav_norm[28] = {
38 2, 0, 1, 9, 10, 3, 8, 4, 5, 9, 10, 6, 7, 12,
39 13, 14, 3, 6, 7, 11, 12, 14, 16, 15, 17, 8, 4, 5,
40 };
41
42 static const uint8_t dca2wav_wide[28] = {
43 2, 0, 1, 4, 5, 3, 8, 4, 5, 9, 10, 6, 7, 12,
44 13, 14, 3, 9, 10, 11, 12, 14, 16, 15, 17, 8, 4, 5,
45 };
46
47 2484 DCAContext *s = avctx->priv_data;
48
49 2484 int dca_ch, wav_ch, nchannels = 0;
50
51 2484 av_channel_layout_uninit(&avctx->ch_layout);
52
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 2484 if (s->output_channel_order == CHANNEL_ORDER_CODED) {
53 ✗ for (dca_ch = 0; dca_ch < DCA_SPEAKER_COUNT; dca_ch++)
54 ✗ if (dca_mask & (1U << dca_ch))
55 ✗ ch_remap[nchannels++] = dca_ch;
56 ✗ avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
57 ✗ avctx->ch_layout.nb_channels = nchannels;
58 } else {
59 2484 int wav_mask = 0;
60 int wav_map[18];
61 const uint8_t *dca2wav;
62
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 2484 if (dca_mask == DCA_SPEAKER_LAYOUT_7POINT0_WIDE ||
63 dca_mask == DCA_SPEAKER_LAYOUT_7POINT1_WIDE)
64 1177 dca2wav = dca2wav_wide;
65 else
66 1307 dca2wav = dca2wav_norm;
67
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 72036 for (dca_ch = 0; dca_ch < 28; dca_ch++) {
68
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 69552 if (dca_mask & (1 << dca_ch)) {
69 15437 wav_ch = dca2wav[dca_ch];
70
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 15437 if (!(wav_mask & (1 << wav_ch))) {
71 15437 wav_map[wav_ch] = dca_ch;
72 15437 wav_mask |= 1 << wav_ch;
73 }
74 }
75 }
76
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 47196 for (wav_ch = 0; wav_ch < 18; wav_ch++)
77
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 44712 if (wav_mask & (1 << wav_ch))
78 15437 ch_remap[nchannels++] = wav_map[wav_ch];
79
80 2484 av_channel_layout_from_mask(&avctx->ch_layout, wav_mask);
81 }
82
83 2484 return nchannels;
84 }
85
86 7 void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
87 int *coeff_l, int nsamples, int ch_mask)
88 {
89 7 int pos, spkr, max_spkr = av_log2(ch_mask);
90 7 int *coeff_r = coeff_l + av_popcount(ch_mask);
91
92
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 7 av_assert0(DCA_HAS_STEREO(ch_mask));
93
94 // Scale left and right channels
95 7 pos = (ch_mask & DCA_SPEAKER_MASK_C);
96 7 dcadsp->dmix_scale(samples[DCA_SPEAKER_L], coeff_l[pos ], nsamples);
97 7 dcadsp->dmix_scale(samples[DCA_SPEAKER_R], coeff_r[pos + 1], nsamples);
98
99 // Downmix remaining channels
100
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 49 for (spkr = 0; spkr <= max_spkr; spkr++) {
101
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 42 if (!(ch_mask & (1U << spkr)))
102 ✗ continue;
103
104
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 42 if (*coeff_l && spkr != DCA_SPEAKER_L)
105 7 dcadsp->dmix_add(samples[DCA_SPEAKER_L], samples[spkr],
106 *coeff_l, nsamples);
107
108
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 42 if (*coeff_r && spkr != DCA_SPEAKER_R)
109 7 dcadsp->dmix_add(samples[DCA_SPEAKER_R], samples[spkr],
110 *coeff_r, nsamples);
111
112 42 coeff_l++;
113 42 coeff_r++;
114 }
115 7 }
116
117 7 void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
118 int *coeff_l, int nsamples, int ch_mask)
119 {
120 7 int pos, spkr, max_spkr = av_log2(ch_mask);
121 7 int *coeff_r = coeff_l + av_popcount(ch_mask);
122 7 const float scale = 1.0f / (1 << 15);
123
124
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 7 av_assert0(DCA_HAS_STEREO(ch_mask));
125
126 // Scale left and right channels
127 7 pos = (ch_mask & DCA_SPEAKER_MASK_C);
128 7 fdsp->vector_fmul_scalar(samples[DCA_SPEAKER_L], samples[DCA_SPEAKER_L],
129 7 coeff_l[pos ] * scale, nsamples);
130 7 fdsp->vector_fmul_scalar(samples[DCA_SPEAKER_R], samples[DCA_SPEAKER_R],
131 7 coeff_r[pos + 1] * scale, nsamples);
132
133 // Downmix remaining channels
134
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 49 for (spkr = 0; spkr <= max_spkr; spkr++) {
135
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 42 if (!(ch_mask & (1U << spkr)))
136 ✗ continue;
137
138
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 42 if (*coeff_l && spkr != DCA_SPEAKER_L)
139 7 fdsp->vector_fmac_scalar(samples[DCA_SPEAKER_L], samples[spkr],
140 7 *coeff_l * scale, nsamples);
141
142
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 42 if (*coeff_r && spkr != DCA_SPEAKER_R)
143 7 fdsp->vector_fmac_scalar(samples[DCA_SPEAKER_R], samples[spkr],
144 7 *coeff_r * scale, nsamples);
145
146 42 coeff_l++;
147 42 coeff_r++;
148 }
149 7 }
150
151 2484 static int dcadec_decode_frame(AVCodecContext *avctx, AVFrame *frame,
152 int *got_frame_ptr, AVPacket *avpkt)
153 {
154 2484 DCAContext *s = avctx->priv_data;
155 2484 const uint8_t *input = avpkt->data;
156 2484 int input_size = avpkt->size;
157 2484 int i, ret, prev_packet = s->packet;
158 uint32_t mrk;
159
160
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 2484 if (input_size < MIN_PACKET_SIZE || input_size > MAX_PACKET_SIZE) {
161 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n");
162 ✗ return AVERROR_INVALIDDATA;
163 }
164
165 // Convert input to BE format
166 2484 mrk = AV_RB32(input);
167
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 2484 if (mrk != DCA_SYNCWORD_CORE_BE && mrk != DCA_SYNCWORD_SUBSTREAM) {
168 1 av_fast_padded_malloc(&s->buffer, &s->buffer_size, input_size);
169
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 1 if (!s->buffer)
170 ✗ return AVERROR(ENOMEM);
171
172
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 2 for (i = 0, ret = AVERROR_INVALIDDATA; i < input_size - MIN_PACKET_SIZE + 1 && ret < 0; i++)
173 1 ret = avpriv_dca_convert_bitstream(input + i, input_size - i, s->buffer, s->buffer_size);
174
175
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 1 if (ret < 0) {
176 ✗ av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
177 ✗ return ret;
178 }
179
180 1 input = s->buffer;
181 1 input_size = ret;
182 }
183
184 2484 s->packet = 0;
185
186 // Parse backward compatible core sub-stream
187
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 2484 if (AV_RB32(input) == DCA_SYNCWORD_CORE_BE) {
188 int frame_size;
189
190
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 2472 if ((ret = ff_dca_core_parse(&s->core, input, input_size)) < 0)
191 ✗ return ret;
192
193 2472 s->packet |= DCA_PACKET_CORE;
194
195 // EXXS data must be aligned on 4-byte boundary
196 2472 frame_size = FFALIGN(s->core.frame_size, 4);
197
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 2472 if (input_size - 4 > frame_size) {
198 1401 input += frame_size;
199 1401 input_size -= frame_size;
200 }
201 }
202
203
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 2484 if (!s->core_only) {
204 2484 DCAExssAsset *asset = NULL;
205
206 // Parse extension sub-stream (EXSS)
207
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 2484 if (AV_RB32(input) == DCA_SYNCWORD_SUBSTREAM) {
208
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 1413 if ((ret = ff_dca_exss_parse(&s->exss, input, input_size)) < 0) {
209 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
210 ✗ return ret;
211 } else {
212 1413 s->packet |= DCA_PACKET_EXSS;
213 1413 asset = &s->exss.assets[0];
214 }
215 }
216
217 // Parse XLL component in EXSS
218
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 2484 if (asset && (asset->extension_mask & DCA_EXSS_XLL)) {
219
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 1357 if ((ret = ff_dca_xll_parse(&s->xll, input, asset)) < 0) {
220 // Conceal XLL synchronization error
221 ✗ if (ret == AVERROR(EAGAIN)) {
222 ✗ if ((prev_packet & DCA_PACKET_XLL) && (s->packet & DCA_PACKET_CORE))
223 ✗ s->packet |= DCA_PACKET_XLL | DCA_PACKET_RECOVERY;
224 ✗ } else if (ret == AVERROR(ENOMEM) || (avctx->err_recognition & AV_EF_EXPLODE))
225 ✗ return ret;
226 } else {
227 1357 s->packet |= DCA_PACKET_XLL;
228 }
229 }
230
231 // Parse LBR component in EXSS
232
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 2484 if (asset && (asset->extension_mask & DCA_EXSS_LBR)) {
233 ✗ if ((ret = ff_dca_lbr_parse(&s->lbr, input, asset)) < 0) {
234 ✗ if (ret == AVERROR(ENOMEM) || (avctx->err_recognition & AV_EF_EXPLODE))
235 ✗ return ret;
236 } else {
237 ✗ s->packet |= DCA_PACKET_LBR;
238 }
239 }
240
241 // Parse core extensions in EXSS or backward compatible core sub-stream
242
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 2484 if ((s->packet & DCA_PACKET_CORE)
243
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 2472 && (ret = ff_dca_core_parse_exss(&s->core, input, asset)) < 0)
244 ✗ return ret;
245 }
246
247 // Filter the frame
248
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 2484 if (s->packet & DCA_PACKET_LBR) {
249 ✗ if ((ret = ff_dca_lbr_filter_frame(&s->lbr, frame)) < 0)
250 ✗ return ret;
251
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 2484 } else if (s->packet & DCA_PACKET_XLL) {
252
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 1357 if (s->packet & DCA_PACKET_CORE) {
253 1345 int x96_synth = -1;
254
255 // Enable X96 synthesis if needed
256
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 1345 if (s->xll.chset[0].freq == 96000 && s->core.sample_rate == 48000)
257 84 x96_synth = 1;
258
259
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 1345 if ((ret = ff_dca_core_filter_fixed(&s->core, x96_synth)) < 0)
260 ✗ return ret;
261
262 // Force lossy downmixed output on the first core frame filtered.
263 // This prevents audible clicks when seeking and is consistent with
264 // what reference decoder does when there are multiple channel sets.
265
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 1345 if (!(prev_packet & DCA_PACKET_RESIDUAL) && s->xll.nreschsets > 0
266
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 54 && s->xll.nchsets > 1) {
267 36 av_log(avctx, AV_LOG_VERBOSE, "Forcing XLL recovery mode\n");
268 36 s->packet |= DCA_PACKET_RECOVERY;
269 }
270
271 // Set 'residual ok' flag for the next frame
272 1345 s->packet |= DCA_PACKET_RESIDUAL;
273 }
274
275
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 1357 if ((ret = ff_dca_xll_filter_frame(&s->xll, frame)) < 0) {
276 // Fall back to core unless hard error
277 ✗ if (!(s->packet & DCA_PACKET_CORE))
278 ✗ return ret;
279 ✗ if (ret != AVERROR_INVALIDDATA || (avctx->err_recognition & AV_EF_EXPLODE))
280 ✗ return ret;
281 ✗ if ((ret = ff_dca_core_filter_frame(&s->core, frame)) < 0)
282 ✗ return ret;
283 }
284
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 1127 } else if (s->packet & DCA_PACKET_CORE) {
285
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 1127 if ((ret = ff_dca_core_filter_frame(&s->core, frame)) < 0)
286 ✗ return ret;
287
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 1127 if (s->core.filter_mode & DCA_FILTER_MODE_FIXED)
288 519 s->packet |= DCA_PACKET_RESIDUAL;
289 } else {
290 ✗ av_log(avctx, AV_LOG_ERROR, "No valid DCA sub-stream found\n");
291 ✗ if (s->core_only)
292 ✗ av_log(avctx, AV_LOG_WARNING, "Consider disabling 'core_only' option\n");
293 ✗ return AVERROR_INVALIDDATA;
294 }
295
296 2484 *got_frame_ptr = 1;
297
298 2484 return avpkt->size;
299 }
300
301 ✗ static av_cold void dcadec_flush(AVCodecContext *avctx)
302 {
303 ✗ DCAContext *s = avctx->priv_data;
304
305 ✗ ff_dca_core_flush(&s->core);
306 ✗ ff_dca_xll_flush(&s->xll);
307 ✗ ff_dca_lbr_flush(&s->lbr);
308
309 ✗ s->packet &= DCA_PACKET_MASK;
310 ✗ }
311
312 101 static av_cold int dcadec_close(AVCodecContext *avctx)
313 {
314 101 DCAContext *s = avctx->priv_data;
315
316 101 ff_dca_core_close(&s->core);
317 101 ff_dca_xll_close(&s->xll);
318 101 ff_dca_lbr_close(&s->lbr);
319
320 101 av_freep(&s->buffer);
321 101 s->buffer_size = 0;
322
323 101 return 0;
324 }
325
326 55 static av_cold void dcadec_init_static(void)
327 {
328 55 ff_dca_lbr_init_tables();
329 55 ff_dca_init_vlcs();
330 55 }
331
332 101 static av_cold int dcadec_init(AVCodecContext *avctx)
333 {
334 static AVOnce init_static_once = AV_ONCE_INIT;
335 101 DCAContext *s = avctx->priv_data;
336
337 101 s->avctx = avctx;
338 101 s->core.avctx = avctx;
339 101 s->exss.avctx = avctx;
340 101 s->xll.avctx = avctx;
341 101 s->lbr.avctx = avctx;
342
343
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 101 if (ff_dca_core_init(&s->core) < 0)
344 ✗ return AVERROR(ENOMEM);
345
346
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 101 if (ff_dca_lbr_init(&s->lbr) < 0)
347 ✗ return AVERROR(ENOMEM);
348
349 101 ff_dcadsp_init(&s->dcadsp);
350 101 s->core.dcadsp = &s->dcadsp;
351 101 s->xll.dcadsp = &s->dcadsp;
352 101 s->lbr.dcadsp = &s->dcadsp;
353
354 101 s->crctab = av_crc_get_table(AV_CRC_16_CCITT);
355
356
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 101 if (s->downmix_layout.nb_channels) {
357
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 66 if (!av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO) ||
358 22 !av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO_DOWNMIX)) {
359 22 s->request_channel_layout = DCA_SPEAKER_LAYOUT_STEREO;
360 22 av_channel_layout_uninit(&avctx->ch_layout);
361 22 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
362
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 22 } else if (!av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0)) {
363 ✗ s->request_channel_layout = DCA_SPEAKER_LAYOUT_5POINT0;
364 ✗ av_channel_layout_uninit(&avctx->ch_layout);
365 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT0;
366
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 22 } else if (!av_channel_layout_compare(&s->downmix_layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1)) {
367 22 s->request_channel_layout = DCA_SPEAKER_LAYOUT_5POINT1;
368 22 av_channel_layout_uninit(&avctx->ch_layout);
369 22 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1;
370 }
371 else
372 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid downmix layout\n");
373 }
374
375 101 ff_thread_once(&init_static_once, dcadec_init_static);
376
377 101 return 0;
378 }
379
380 #define OFFSET(x) offsetof(DCAContext, x)
381 #define PARAM AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
382
383 static const AVOption dcadec_options[] = {
384 { "core_only", "Decode core only without extensions", OFFSET(core_only), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, PARAM },
385
386 { "channel_order", "Order in which the channels are to be exported",
387 OFFSET(output_channel_order), AV_OPT_TYPE_INT,
388 { .i64 = CHANNEL_ORDER_DEFAULT }, 0, 1, PARAM, .unit = "channel_order" },
389 { "default", "normal libavcodec channel order", 0, AV_OPT_TYPE_CONST,
390 { .i64 = CHANNEL_ORDER_DEFAULT }, .flags = PARAM, .unit = "channel_order" },
391 { "coded", "order in which the channels are coded in the bitstream",
392 0, AV_OPT_TYPE_CONST, { .i64 = CHANNEL_ORDER_CODED }, .flags = PARAM, .unit = "channel_order" },
393
394 { "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout),
395 AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = PARAM },
396
397 { NULL }
398 };
399
400 static const AVClass dcadec_class = {
401 .class_name = "DCA decoder",
402 .item_name = av_default_item_name,
403 .option = dcadec_options,
404 .version = LIBAVUTIL_VERSION_INT,
405 .category = AV_CLASS_CATEGORY_DECODER,
406 };
407
408 const FFCodec ff_dca_decoder = {
409 .p.name = "dca",
410 CODEC_LONG_NAME("DCA (DTS Coherent Acoustics)"),
411 .p.type = AVMEDIA_TYPE_AUDIO,
412 .p.id = AV_CODEC_ID_DTS,
413 .priv_data_size = sizeof(DCAContext),
414 .init = dcadec_init,
415 FF_CODEC_DECODE_CB(dcadec_decode_frame),
416 .close = dcadec_close,
417 .flush = dcadec_flush,
418 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
419 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_FLTP),
420 .p.priv_class = &dcadec_class,
421 .p.profiles = NULL_IF_CONFIG_SMALL(ff_dca_profiles),
422 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
423 };
424