FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dca_core.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 903 1253 72.1%
Functions: 39 43 90.7%
Branches: 632 954 66.2%
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/channel_layout.h"
22 #include "libavutil/mem.h"
23 #include "dcaadpcm.h"
24 #include "dcadec.h"
25 #include "dcadata.h"
26 #include "dcahuff.h"
27 #include "dcamath.h"
28 #include "dca_syncwords.h"
29 #include "decode.h"
30
31 #if ARCH_ARM
32 #include "arm/dca.h"
33 #endif
34
35 enum HeaderType {
36 HEADER_CORE,
37 HEADER_XCH,
38 HEADER_XXCH
39 };
40
41 static const int8_t prm_ch_to_spkr_map[DCA_AMODE_COUNT][5] = {
42 { DCA_SPEAKER_C, -1, -1, -1, -1 },
43 { DCA_SPEAKER_L, DCA_SPEAKER_R, -1, -1, -1 },
44 { DCA_SPEAKER_L, DCA_SPEAKER_R, -1, -1, -1 },
45 { DCA_SPEAKER_L, DCA_SPEAKER_R, -1, -1, -1 },
46 { DCA_SPEAKER_L, DCA_SPEAKER_R, -1, -1, -1 },
47 { DCA_SPEAKER_C, DCA_SPEAKER_L, DCA_SPEAKER_R , -1, -1 },
48 { DCA_SPEAKER_L, DCA_SPEAKER_R, DCA_SPEAKER_Cs, -1, -1 },
49 { DCA_SPEAKER_C, DCA_SPEAKER_L, DCA_SPEAKER_R , DCA_SPEAKER_Cs, -1 },
50 { DCA_SPEAKER_L, DCA_SPEAKER_R, DCA_SPEAKER_Ls, DCA_SPEAKER_Rs, -1 },
51 { DCA_SPEAKER_C, DCA_SPEAKER_L, DCA_SPEAKER_R, DCA_SPEAKER_Ls, DCA_SPEAKER_Rs }
52 };
53
54 static const uint8_t audio_mode_ch_mask[DCA_AMODE_COUNT] = {
55 DCA_SPEAKER_LAYOUT_MONO,
56 DCA_SPEAKER_LAYOUT_STEREO,
57 DCA_SPEAKER_LAYOUT_STEREO,
58 DCA_SPEAKER_LAYOUT_STEREO,
59 DCA_SPEAKER_LAYOUT_STEREO,
60 DCA_SPEAKER_LAYOUT_3_0,
61 DCA_SPEAKER_LAYOUT_2_1,
62 DCA_SPEAKER_LAYOUT_3_1,
63 DCA_SPEAKER_LAYOUT_2_2,
64 DCA_SPEAKER_LAYOUT_5POINT0
65 };
66
67 static const uint8_t block_code_nbits[7] = {
68 7, 10, 12, 13, 15, 17, 19
69 };
70
71 77291 static int dca_get_vlc(GetBitContext *s, const VLC *vlc)
72 {
73 77291 return get_vlc2(s, vlc->table, vlc->bits, 2);
74 }
75
76 290488 static void get_array(GetBitContext *s, int32_t *array, int size, int n)
77 {
78 int i;
79
80
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 2614400 for (i = 0; i < size; i++)
81 2323912 array[i] = get_sbits(s, n);
82 290488 }
83
84 // 5.3.1 - Bit stream header
85 2472 static int parse_frame_header(DCACoreDecoder *s)
86 {
87 2472 DCACoreFrameHeader h = { 0 };
88 2472 int err = ff_dca_parse_core_frame_header(&h, &s->gb);
89
90
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 2472 if (err < 0) {
91 ✗ switch (err) {
92 ✗ case DCA_PARSE_ERROR_DEFICIT_SAMPLES:
93 ✗ av_log(s->avctx, AV_LOG_ERROR, "Deficit samples are not supported\n");
94 ✗ return h.normal_frame ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
95
96 ✗ case DCA_PARSE_ERROR_PCM_BLOCKS:
97 ✗ av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of PCM sample blocks (%d)\n", h.npcmblocks);
98 ✗ return (h.npcmblocks < 6 || h.normal_frame) ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
99
100 ✗ case DCA_PARSE_ERROR_FRAME_SIZE:
101 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid core frame size (%d bytes)\n", h.frame_size);
102 ✗ return AVERROR_INVALIDDATA;
103
104 ✗ case DCA_PARSE_ERROR_AMODE:
105 ✗ av_log(s->avctx, AV_LOG_ERROR, "Unsupported audio channel arrangement (%d)\n", h.audio_mode);
106 ✗ return AVERROR_PATCHWELCOME;
107
108 ✗ case DCA_PARSE_ERROR_SAMPLE_RATE:
109 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid core audio sampling frequency\n");
110 ✗ return AVERROR_INVALIDDATA;
111
112 ✗ case DCA_PARSE_ERROR_RESERVED_BIT:
113 ✗ av_log(s->avctx, AV_LOG_ERROR, "Reserved bit set\n");
114 ✗ return AVERROR_INVALIDDATA;
115
116 ✗ case DCA_PARSE_ERROR_LFE_FLAG:
117 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid low frequency effects flag\n");
118 ✗ return AVERROR_INVALIDDATA;
119
120 ✗ case DCA_PARSE_ERROR_PCM_RES:
121 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid source PCM resolution\n");
122 ✗ return AVERROR_INVALIDDATA;
123
124 ✗ default:
125 ✗ av_log(s->avctx, AV_LOG_ERROR, "Unknown core frame header error\n");
126 ✗ return AVERROR_INVALIDDATA;
127 }
128 }
129
130 2472 s->crc_present = h.crc_present;
131 2472 s->npcmblocks = h.npcmblocks;
132 2472 s->frame_size = h.frame_size;
133 2472 s->audio_mode = h.audio_mode;
134 2472 s->sample_rate = ff_dca_sample_rates[h.sr_code];
135 2472 s->bit_rate = ff_dca_bit_rates[h.br_code];
136 2472 s->drc_present = h.drc_present;
137 2472 s->ts_present = h.ts_present;
138 2472 s->aux_present = h.aux_present;
139 2472 s->ext_audio_type = h.ext_audio_type;
140 2472 s->ext_audio_present = h.ext_audio_present;
141 2472 s->sync_ssf = h.sync_ssf;
142 2472 s->lfe_present = h.lfe_present;
143 2472 s->predictor_history = h.predictor_history;
144 2472 s->filter_perfect = h.filter_perfect;
145 2472 s->source_pcm_res = ff_dca_bits_per_sample[h.pcmr_code];
146 2472 s->es_format = h.pcmr_code & 1;
147 2472 s->sumdiff_front = h.sumdiff_front;
148 2472 s->sumdiff_surround = h.sumdiff_surround;
149
150 2472 return 0;
151 }
152
153 // 5.3.2 - Primary audio coding header
154 2772 static int parse_coding_header(DCACoreDecoder *s, enum HeaderType header, int xch_base)
155 {
156 2772 int n, ch, nchannels, header_size = 0, header_pos = get_bits_count(&s->gb);
157 unsigned int mask, index;
158
159
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 2772 if (get_bits_left(&s->gb) < 0)
160 ✗ return AVERROR_INVALIDDATA;
161
162
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 2772 switch (header) {
163 2472 case HEADER_CORE:
164 // Number of subframes
165 2472 s->nsubframes = get_bits(&s->gb, 4) + 1;
166
167 // Number of primary audio channels
168 2472 s->nchannels = get_bits(&s->gb, 3) + 1;
169
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 2472 if (s->nchannels != ff_dca_channels[s->audio_mode]) {
170 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of primary audio channels (%d) for audio channel arrangement (%d)\n", s->nchannels, s->audio_mode);
171 ✗ return AVERROR_INVALIDDATA;
172 }
173 av_assert1(s->nchannels <= DCA_CHANNELS - 2);
174
175 2472 s->ch_mask = audio_mode_ch_mask[s->audio_mode];
176
177 // Add LFE channel if present
178
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 2472 if (s->lfe_present)
179 1954 s->ch_mask |= DCA_SPEAKER_MASK_LFE1;
180 2472 break;
181
182 279 case HEADER_XCH:
183 279 s->nchannels = ff_dca_channels[s->audio_mode] + 1;
184 av_assert1(s->nchannels <= DCA_CHANNELS - 1);
185 279 s->ch_mask |= DCA_SPEAKER_MASK_Cs;
186 279 break;
187
188 21 case HEADER_XXCH:
189 // Channel set header length
190 21 header_size = get_bits(&s->gb, 7) + 1;
191
192 // Check CRC
193
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 21 if (s->xxch_crc_present
194
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 21 && ff_dca_check_crc(s->avctx, &s->gb, header_pos, header_pos + header_size * 8)) {
195 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH channel set header checksum\n");
196 ✗ return AVERROR_INVALIDDATA;
197 }
198
199 // Number of channels in a channel set
200 21 nchannels = get_bits(&s->gb, 3) + 1;
201
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 21 if (nchannels > DCA_XXCH_CHANNELS_MAX) {
202 ✗ avpriv_request_sample(s->avctx, "%d XXCH channels", nchannels);
203 ✗ return AVERROR_PATCHWELCOME;
204 }
205 21 s->nchannels = ff_dca_channels[s->audio_mode] + nchannels;
206 av_assert1(s->nchannels <= DCA_CHANNELS);
207
208 // Loudspeaker layout mask
209 21 mask = get_bits_long(&s->gb, s->xxch_mask_nbits - DCA_SPEAKER_Cs);
210 21 s->xxch_spkr_mask = mask << DCA_SPEAKER_Cs;
211
212
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 21 if (av_popcount(s->xxch_spkr_mask) != nchannels) {
213 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH speaker layout mask (%#x)\n", s->xxch_spkr_mask);
214 ✗ return AVERROR_INVALIDDATA;
215 }
216
217
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 21 if (s->xxch_core_mask & s->xxch_spkr_mask) {
218 ✗ av_log(s->avctx, AV_LOG_ERROR, "XXCH speaker layout mask (%#x) overlaps with core (%#x)\n", s->xxch_spkr_mask, s->xxch_core_mask);
219 ✗ return AVERROR_INVALIDDATA;
220 }
221
222 // Combine core and XXCH masks together
223 21 s->ch_mask = s->xxch_core_mask | s->xxch_spkr_mask;
224
225 // Downmix coefficients present in stream
226
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 21 if (get_bits1(&s->gb)) {
227 21 int *coeff_ptr = s->xxch_dmix_coeff;
228
229 // Downmix already performed by encoder
230 21 s->xxch_dmix_embedded = get_bits1(&s->gb);
231
232 // Downmix scale factor
233 21 index = get_bits(&s->gb, 6) * 4 - FF_DCA_DMIXTABLE_OFFSET - 3;
234
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 21 if (index >= FF_DCA_INV_DMIXTABLE_SIZE) {
235 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH downmix scale index (%d)\n", index);
236 ✗ return AVERROR_INVALIDDATA;
237 }
238 21 s->xxch_dmix_scale_inv = ff_dca_inv_dmixtable[index];
239
240 // Downmix channel mapping mask
241
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 63 for (ch = 0; ch < nchannels; ch++) {
242 42 mask = get_bits_long(&s->gb, s->xxch_mask_nbits);
243
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 42 if ((mask & s->xxch_core_mask) != mask) {
244 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH downmix channel mapping mask (%#x)\n", mask);
245 ✗ return AVERROR_INVALIDDATA;
246 }
247 42 s->xxch_dmix_mask[ch] = mask;
248 }
249
250 // Downmix coefficients
251
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 63 for (ch = 0; ch < nchannels; ch++) {
252
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 504 for (n = 0; n < s->xxch_mask_nbits; n++) {
253
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 462 if (s->xxch_dmix_mask[ch] & (1U << n)) {
254 42 int code = get_bits(&s->gb, 7);
255 42 int sign = (code >> 6) - 1;
256
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 42 if (code &= 63) {
257 42 index = code * 4 - 3;
258
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 42 if (index >= FF_DCA_DMIXTABLE_SIZE) {
259 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH downmix coefficient index (%d)\n", index);
260 ✗ return AVERROR_INVALIDDATA;
261 }
262 42 *coeff_ptr++ = (ff_dca_dmixtable[index] ^ sign) - sign;
263 } else {
264 ✗ *coeff_ptr++ = 0;
265 }
266 }
267 }
268 }
269 } else {
270 ✗ s->xxch_dmix_embedded = 0;
271 }
272
273 21 break;
274 }
275
276 // Subband activity count
277
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
278 11127 s->nsubbands[ch] = get_bits(&s->gb, 5) + 2;
279
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 11127 if (s->nsubbands[ch] > DCA_SUBBANDS) {
280 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid subband activity count\n");
281 ✗ return AVERROR_INVALIDDATA;
282 }
283 }
284
285 // High frequency VQ start subband
286
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 13899 for (ch = xch_base; ch < s->nchannels; ch++)
287 11127 s->subband_vq_start[ch] = get_bits(&s->gb, 5) + 1;
288
289 // Joint intensity coding index
290
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
291
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 11127 if ((n = get_bits(&s->gb, 3)) && header == HEADER_XXCH)
292 ✗ n += xch_base - 1;
293
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 11127 if (n > s->nchannels) {
294 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid joint intensity coding index\n");
295 ✗ return AVERROR_INVALIDDATA;
296 }
297 11127 s->joint_intensity_index[ch] = n;
298 }
299
300 // Transient mode code book
301
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 13899 for (ch = xch_base; ch < s->nchannels; ch++)
302 11127 s->transition_mode_sel[ch] = get_bits(&s->gb, 2);
303
304 // Scale factor code book
305
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
306 11127 s->scale_factor_sel[ch] = get_bits(&s->gb, 3);
307
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 11127 if (s->scale_factor_sel[ch] == 7) {
308 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid scale factor code book\n");
309 ✗ return AVERROR_INVALIDDATA;
310 }
311 }
312
313 // Bit allocation quantizer select
314
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
315 11127 s->bit_allocation_sel[ch] = get_bits(&s->gb, 3);
316
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 11127 if (s->bit_allocation_sel[ch] == 7) {
317 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid bit allocation quantizer select\n");
318 ✗ return AVERROR_INVALIDDATA;
319 }
320 }
321
322 // Quantization index codebook select
323
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 30492 for (n = 0; n < DCA_CODE_BOOKS; n++)
324
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 138990 for (ch = xch_base; ch < s->nchannels; ch++)
325 111270 s->quant_index_sel[ch][n] = get_bits(&s->gb, ff_dca_quant_index_sel_nbits[n]);
326
327 // Scale factor adjustment index
328
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 30492 for (n = 0; n < DCA_CODE_BOOKS; n++)
329
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 138990 for (ch = xch_base; ch < s->nchannels; ch++)
330
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 111270 if (s->quant_index_sel[ch][n] < ff_dca_quant_index_group_size[n])
331 2922 s->scale_factor_adj[ch][n] = ff_dca_scale_factor_adj[get_bits(&s->gb, 2)];
332
333
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 2772 if (header == HEADER_XXCH) {
334 // Reserved
335 // Byte align
336 // CRC16 of channel set header
337
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 21 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) {
338 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XXCH channel set header\n");
339 ✗ return AVERROR_INVALIDDATA;
340 }
341 } else {
342 // Audio header CRC check word
343
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 2751 if (s->crc_present)
344 ✗ skip_bits(&s->gb, 16);
345 }
346
347 2772 return 0;
348 }
349
350 361882 static inline int parse_scale(DCACoreDecoder *s, int *scale_index, int sel)
351 {
352 const uint32_t *scale_table;
353 unsigned int scale_size;
354
355 // Select the root square table
356
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 361882 if (sel > 5) {
357 291150 scale_table = ff_dca_scale_factor_quant7;
358 291150 scale_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant7);
359 } else {
360 70732 scale_table = ff_dca_scale_factor_quant6;
361 70732 scale_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant6);
362 }
363
364 // If Huffman code was used, the difference of scales was encoded
365
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 361882 if (sel < 5)
366 9135 *scale_index += get_vlc2(&s->gb, ff_dca_vlc_scale_factor[sel].table,
367 DCA_SCALES_VLC_BITS, 2);
368 else
369 352747 *scale_index = get_bits(&s->gb, sel + 1);
370
371 // Look up scale factor from the root square table
372
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 361882 if ((unsigned int)*scale_index >= scale_size) {
373 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid scale factor index\n");
374 ✗ return AVERROR_INVALIDDATA;
375 }
376
377 361882 return scale_table[*scale_index];
378 }
379
380 2541 static inline int parse_joint_scale(DCACoreDecoder *s, int sel)
381 {
382 int scale_index;
383
384 // Absolute value was encoded even when Huffman code was used
385
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 2541 if (sel < 5)
386 2541 scale_index = get_vlc2(&s->gb, ff_dca_vlc_scale_factor[sel].table,
387 DCA_SCALES_VLC_BITS, 2);
388 else
389 ✗ scale_index = get_bits(&s->gb, sel + 1);
390
391 // Bias by 64
392 2541 scale_index += 64;
393
394 // Look up joint scale factor
395
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 2541 if ((unsigned int)scale_index >= FF_ARRAY_ELEMS(ff_dca_joint_scale_factors)) {
396 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid joint scale factor index\n");
397 ✗ return AVERROR_INVALIDDATA;
398 }
399
400 2541 return ff_dca_joint_scale_factors[scale_index];
401 }
402
403 // 5.4.1 - Primary audio coding side information
404 2772 static int parse_subframe_header(DCACoreDecoder *s, int sf,
405 enum HeaderType header, int xch_base)
406 {
407 int ch, band, ret;
408
409
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 2772 if (get_bits_left(&s->gb) < 0)
410 ✗ return AVERROR_INVALIDDATA;
411
412
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 2772 if (header == HEADER_CORE) {
413 // Subsubframe count
414 2472 s->nsubsubframes[sf] = get_bits(&s->gb, 2) + 1;
415
416 // Partial subsubframe sample count
417 2472 skip_bits(&s->gb, 3);
418 }
419
420 // Prediction mode
421
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 13899 for (ch = xch_base; ch < s->nchannels; ch++)
422
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 353860 for (band = 0; band < s->nsubbands[ch]; band++)
423 342733 s->prediction_mode[ch][band] = get_bits1(&s->gb);
424
425 // Prediction coefficients VQ address
426
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 13899 for (ch = xch_base; ch < s->nchannels; ch++)
427
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 353860 for (band = 0; band < s->nsubbands[ch]; band++)
428
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 342733 if (s->prediction_mode[ch][band])
429 24519 s->prediction_vq_index[ch][band] = get_bits(&s->gb, 12);
430
431 // Bit allocation index
432
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
433 11127 int sel = s->bit_allocation_sel[ch];
434
435
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 310386 for (band = 0; band < s->subband_vq_start[ch]; band++) {
436 int abits;
437
438
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 299259 if (sel < 5)
439 ✗ abits = dca_get_vlc(&s->gb, &ff_dca_vlc_bit_allocation[sel]);
440 else
441 299259 abits = get_bits(&s->gb, sel - 1);
442
443
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 299259 if (abits > DCA_ABITS_MAX) {
444 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid bit allocation index\n");
445 ✗ return AVERROR_INVALIDDATA;
446 }
447
448 299259 s->bit_allocation[ch][band] = abits;
449 }
450 }
451
452 // Transition mode
453
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
454 // Clear transition mode for all subbands
455 11127 memset(s->transition_mode[sf][ch], 0, sizeof(s->transition_mode[0][0]));
456
457 // Transient possible only if more than one subsubframe
458
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 11127 if (s->nsubsubframes[sf] > 1) {
459 11127 int sel = s->transition_mode_sel[ch];
460
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 310386 for (band = 0; band < s->subband_vq_start[ch]; band++)
461
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 299259 if (s->bit_allocation[ch][band])
462 299259 s->transition_mode[sf][ch][band] = get_vlc2(&s->gb, ff_dca_vlc_transition_mode[sel].table,
463 DCA_TMODE_VLC_BITS, 1);
464 }
465 }
466
467 // Scale factors
468
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
469 11127 int sel = s->scale_factor_sel[ch];
470 11127 int scale_index = 0;
471
472 // Extract scales for subbands up to VQ
473
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 310386 for (band = 0; band < s->subband_vq_start[ch]; band++) {
474
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 299259 if (s->bit_allocation[ch][band]) {
475
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 299259 if ((ret = parse_scale(s, &scale_index, sel)) < 0)
476 ✗ return ret;
477 299259 s->scale_factors[ch][band][0] = ret;
478
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 299259 if (s->transition_mode[sf][ch][band]) {
479
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 10014 if ((ret = parse_scale(s, &scale_index, sel)) < 0)
480 ✗ return ret;
481 10014 s->scale_factors[ch][band][1] = ret;
482 }
483 } else {
484 ✗ s->scale_factors[ch][band][0] = 0;
485 }
486 }
487
488 // High frequency VQ subbands
489
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 54601 for (band = s->subband_vq_start[ch]; band < s->nsubbands[ch]; band++) {
490
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 43474 if ((ret = parse_scale(s, &scale_index, sel)) < 0)
491 ✗ return ret;
492 43474 s->scale_factors[ch][band][0] = ret;
493 }
494 }
495
496 // Joint subband codebook select
497
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
498
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 11127 if (s->joint_intensity_index[ch]) {
499 14 s->joint_scale_sel[ch] = get_bits(&s->gb, 3);
500
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 14 if (s->joint_scale_sel[ch] == 7) {
501 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid joint scale factor code book\n");
502 ✗ return AVERROR_INVALIDDATA;
503 }
504 }
505 }
506
507 // Scale factors for joint subband coding
508
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
509 11127 int src_ch = s->joint_intensity_index[ch] - 1;
510
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 11127 if (src_ch >= 0) {
511 14 int sel = s->joint_scale_sel[ch];
512
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 91 for (band = s->nsubbands[ch]; band < s->nsubbands[src_ch]; band++) {
513
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 77 if ((ret = parse_joint_scale(s, sel)) < 0)
514 ✗ return ret;
515 77 s->joint_scale_factors[ch][band] = ret;
516 }
517 }
518 }
519
520 // Dynamic range coefficient
521
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 2772 if (s->drc_present && header == HEADER_CORE)
522 ✗ skip_bits(&s->gb, 8);
523
524 // Side information CRC check word
525
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 2772 if (s->crc_present)
526 ✗ skip_bits(&s->gb, 16);
527
528 2772 return 0;
529 }
530
531 #ifndef decode_blockcodes
532 319260 static inline int decode_blockcodes(int code1, int code2, int levels, int32_t *audio)
533 {
534 319260 int offset = (levels - 1) / 2;
535 int n, div;
536
537
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 1596300 for (n = 0; n < DCA_SUBBAND_SAMPLES / 2; n++) {
538 1277040 div = FASTDIV(code1, levels);
539 1277040 audio[n] = code1 - div * levels - offset;
540 1277040 code1 = div;
541 }
542
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 1596300 for (; n < DCA_SUBBAND_SAMPLES; n++) {
543 1277040 div = FASTDIV(code2, levels);
544 1277040 audio[n] = code2 - div * levels - offset;
545 1277040 code2 = div;
546 }
547
548 319260 return code1 | code2;
549 }
550 #endif
551
552 319260 static inline int parse_block_codes(DCACoreDecoder *s, int32_t *audio, int abits)
553 {
554 // Extract block code indices from the bit stream
555 319260 int code1 = get_bits(&s->gb, block_code_nbits[abits - 1]);
556 319260 int code2 = get_bits(&s->gb, block_code_nbits[abits - 1]);
557 319260 int levels = ff_dca_quant_levels[abits];
558
559 // Look up samples from the block code book
560
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 319260 if (decode_blockcodes(code1, code2, levels, audio)) {
561 ✗ av_log(s->avctx, AV_LOG_ERROR, "Failed to decode block code(s)\n");
562 ✗ return AVERROR_INVALIDDATA;
563 }
564
565 319260 return 0;
566 }
567
568 8522 static inline int parse_huffman_codes(DCACoreDecoder *s, int32_t *audio, int abits, int sel)
569 {
570 int i;
571
572 // Extract Huffman codes from the bit stream
573
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 76698 for (i = 0; i < DCA_SUBBAND_SAMPLES; i++)
574 68176 audio[i] = dca_get_vlc(&s->gb, &ff_dca_vlc_quant_index[abits - 1][sel]);
575
576 8522 return 1;
577 }
578
579 611654 static inline int extract_audio(DCACoreDecoder *s, int32_t *audio, int abits, int ch)
580 {
581 av_assert1(abits >= 0 && abits <= DCA_ABITS_MAX);
582
583
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 611654 if (abits == 0) {
584 // No bits allocated
585 ✗ memset(audio, 0, DCA_SUBBAND_SAMPLES * sizeof(*audio));
586 ✗ return 0;
587 }
588
589
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 611654 if (abits <= DCA_CODE_BOOKS) {
590 446136 int sel = s->quant_index_sel[ch][abits - 1];
591
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 446136 if (sel < ff_dca_quant_index_group_size[abits - 1]) {
592 // Huffman codes
593 8522 return parse_huffman_codes(s, audio, abits, sel);
594 }
595
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 437614 if (abits <= 7) {
596 // Block codes
597 318166 return parse_block_codes(s, audio, abits);
598 }
599 }
600
601 // No further encoding
602 284966 get_array(&s->gb, audio, DCA_SUBBAND_SAMPLES, abits - 3);
603 284966 return 0;
604 }
605
606 11323 static inline void inverse_adpcm(int32_t **subband_samples,
607 const int16_t *vq_index,
608 const int8_t *prediction_mode,
609 int sb_start, int sb_end,
610 int ofs, int len)
611 {
612 int i, j;
613
614
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 363191 for (i = sb_start; i < sb_end; i++) {
615
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 351868 if (prediction_mode[i]) {
616 24566 const int pred_id = vq_index[i];
617 24566 int32_t *ptr = subband_samples[i] + ofs;
618
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 418182 for (j = 0; j < len; j++) {
619 393616 int32_t x = ff_dcaadpcm_predict(pred_id, ptr + j - DCA_ADPCM_COEFFS);
620 393616 ptr[j] = clip23(ptr[j] + x);
621 }
622 }
623 }
624 11323 }
625
626 // 5.5 - Primary audio data arrays
627 2772 static int parse_subframe_audio(DCACoreDecoder *s, int sf, enum HeaderType header,
628 int xch_base, int *sub_pos, int *lfe_pos)
629 {
630 int32_t audio[16], scale;
631 int n, ssf, ofs, ch, band;
632
633 // Check number of subband samples in this subframe
634 2772 int nsamples = s->nsubsubframes[sf] * DCA_SUBBAND_SAMPLES;
635
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 2772 if (*sub_pos + nsamples > s->npcmblocks) {
636 ✗ av_log(s->avctx, AV_LOG_ERROR, "Subband sample buffer overflow\n");
637 ✗ return AVERROR_INVALIDDATA;
638 }
639
640
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 2772 if (get_bits_left(&s->gb) < 0)
641 ✗ return AVERROR_INVALIDDATA;
642
643 // VQ encoded subbands
644
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
645 int32_t vq_index[DCA_SUBBANDS];
646
647
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 54601 for (band = s->subband_vq_start[ch]; band < s->nsubbands[ch]; band++)
648 // Extract the VQ address from the bit stream
649 43474 vq_index[band] = get_bits(&s->gb, 10);
650
651
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 11127 if (s->subband_vq_start[ch] < s->nsubbands[ch]) {
652 9771 s->dcadsp->decode_hf(s->subband_samples[ch], vq_index,
653 9771 ff_dca_high_freq_vq, s->scale_factors[ch],
654 9771 s->subband_vq_start[ch], s->nsubbands[ch],
655 9771 *sub_pos, nsamples);
656 }
657 }
658
659 // Low frequency effect data
660
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 2772 if (s->lfe_present && header == HEADER_CORE) {
661 unsigned int index;
662
663 // Determine number of LFE samples in this subframe
664 1954 int nlfesamples = 2 * s->lfe_present * s->nsubsubframes[sf];
665 av_assert1((unsigned int)nlfesamples <= FF_ARRAY_ELEMS(audio));
666
667 // Extract LFE samples from the bit stream
668 1954 get_array(&s->gb, audio, nlfesamples, 8);
669
670 // Extract scale factor index from the bit stream
671 1954 index = get_bits(&s->gb, 8);
672
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 1954 if (index >= FF_ARRAY_ELEMS(ff_dca_scale_factor_quant7)) {
673 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid LFE scale factor index\n");
674 ✗ return AVERROR_INVALIDDATA;
675 }
676
677 // Look up the 7-bit root square quantization table
678 1954 scale = ff_dca_scale_factor_quant7[index];
679
680 // Account for quantizer step size which is 0.035
681 1954 scale = mul23(4697620 /* 0.035 * (1 << 27) */, scale);
682
683 // Scale and take the LFE samples
684
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 17594 for (n = 0, ofs = *lfe_pos; n < nlfesamples; n++, ofs++)
685 15640 s->lfe_samples[ofs] = clip23(audio[n] * scale >> 4);
686
687 // Advance LFE sample pointer for the next subframe
688 1954 *lfe_pos = ofs;
689 }
690
691 // Audio data
692
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 8318 for (ssf = 0, ofs = *sub_pos; ssf < s->nsubsubframes[sf]; ssf++) {
693
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 27810 for (ch = xch_base; ch < s->nchannels; ch++) {
694
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 22264 if (get_bits_left(&s->gb) < 0)
695 ✗ return AVERROR_INVALIDDATA;
696
697 // Not high frequency VQ subbands
698
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 621102 for (band = 0; band < s->subband_vq_start[ch]; band++) {
699 598838 int ret, trans_ssf, abits = s->bit_allocation[ch][band];
700 int32_t step_size;
701
702 // Extract bits from the bit stream
703
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 598838 if ((ret = extract_audio(s, audio, abits, ch)) < 0)
704 ✗ return ret;
705
706 // Select quantization step size table and look up
707 // quantization step size
708
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 598838 if (s->bit_rate == 3)
709 ✗ step_size = ff_dca_lossless_quant[abits];
710 else
711 598838 step_size = ff_dca_lossy_quant[abits];
712
713 // Identify transient location
714 598838 trans_ssf = s->transition_mode[sf][ch][band];
715
716 // Determine proper scale factor
717
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 598838 if (trans_ssf == 0 || ssf < trans_ssf)
718 588824 scale = s->scale_factors[ch][band][0];
719 else
720 10014 scale = s->scale_factors[ch][band][1];
721
722 // Adjust scale factor when SEL indicates Huffman code
723
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 598838 if (ret > 0) {
724 8054 int64_t adj = s->scale_factor_adj[ch][abits - 1];
725 8054 scale = clip23(adj * scale >> 22);
726 }
727
728 598838 ff_dca_core_dequantize(s->subband_samples[ch][band] + ofs,
729 audio, step_size, scale, 0, DCA_SUBBAND_SAMPLES);
730 }
731 }
732
733 // DSYNC
734
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 5546 if ((ssf == s->nsubsubframes[sf] - 1 || s->sync_ssf) && get_bits(&s->gb, 16) != 0xffff) {
735 ✗ av_log(s->avctx, AV_LOG_ERROR, "DSYNC check failed\n");
736 ✗ return AVERROR_INVALIDDATA;
737 }
738
739 5546 ofs += DCA_SUBBAND_SAMPLES;
740 }
741
742 // Inverse ADPCM
743
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
744 11127 inverse_adpcm(s->subband_samples[ch], s->prediction_vq_index[ch],
745 11127 s->prediction_mode[ch], 0, s->nsubbands[ch],
746 *sub_pos, nsamples);
747 }
748
749 // Joint subband coding
750
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
751 11127 int src_ch = s->joint_intensity_index[ch] - 1;
752
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 11127 if (src_ch >= 0) {
753 14 s->dcadsp->decode_joint(s->subband_samples[ch], s->subband_samples[src_ch],
754 14 s->joint_scale_factors[ch], s->nsubbands[ch],
755 14 s->nsubbands[src_ch], *sub_pos, nsamples);
756 }
757 }
758
759 // Advance subband sample pointer for the next subframe
760 2772 *sub_pos = ofs;
761 2772 return 0;
762 }
763
764 ✗ static void erase_adpcm_history(DCACoreDecoder *s)
765 {
766 int ch, band;
767
768 // Erase ADPCM history from previous frame if
769 // predictor history switch was disabled
770 ✗ for (ch = 0; ch < DCA_CHANNELS; ch++)
771 ✗ for (band = 0; band < DCA_SUBBANDS; band++)
772 ✗ AV_ZERO128(s->subband_samples[ch][band] - DCA_ADPCM_COEFFS);
773 ✗ }
774
775 2472 static int alloc_sample_buffer(DCACoreDecoder *s)
776 {
777 2472 int nchsamples = DCA_ADPCM_COEFFS + s->npcmblocks;
778 2472 int nframesamples = nchsamples * DCA_CHANNELS * DCA_SUBBANDS;
779 2472 int nlfesamples = DCA_LFE_HISTORY + s->npcmblocks / 2;
780 2472 unsigned int size = s->subband_size;
781 int ch, band;
782
783 // Reallocate subband sample buffer
784 2472 av_fast_mallocz(&s->subband_buffer, &s->subband_size,
785 2472 (nframesamples + nlfesamples) * sizeof(int32_t));
786
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 2472 if (!s->subband_buffer)
787 ✗ return AVERROR(ENOMEM);
788
789
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 2472 if (size != s->subband_size) {
790
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 752 for (ch = 0; ch < DCA_CHANNELS; ch++)
791
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 21714 for (band = 0; band < DCA_SUBBANDS; band++)
792 21056 s->subband_samples[ch][band] = s->subband_buffer +
793 21056 (ch * DCA_SUBBANDS + band) * nchsamples + DCA_ADPCM_COEFFS;
794 94 s->lfe_samples = s->subband_buffer + nframesamples;
795 }
796
797
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 2472 if (!s->predictor_history)
798 ✗ erase_adpcm_history(s);
799
800 2472 return 0;
801 }
802
803 2772 static int parse_frame_data(DCACoreDecoder *s, enum HeaderType header, int xch_base)
804 {
805 int sf, ch, ret, band, sub_pos, lfe_pos;
806
807
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 2772 if ((ret = parse_coding_header(s, header, xch_base)) < 0)
808 ✗ return ret;
809
810
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 5544 for (sf = 0, sub_pos = 0, lfe_pos = DCA_LFE_HISTORY; sf < s->nsubframes; sf++) {
811
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 2772 if ((ret = parse_subframe_header(s, sf, header, xch_base)) < 0)
812 ✗ return ret;
813
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 2772 if ((ret = parse_subframe_audio(s, sf, header, xch_base, &sub_pos, &lfe_pos)) < 0)
814 ✗ return ret;
815 }
816
817
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 13899 for (ch = xch_base; ch < s->nchannels; ch++) {
818 // Determine number of active subbands for this channel
819 11127 int nsubbands = s->nsubbands[ch];
820
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 11127 if (s->joint_intensity_index[ch])
821 14 nsubbands = FFMAX(nsubbands, s->nsubbands[s->joint_intensity_index[ch] - 1]);
822
823 // Update history for ADPCM
824
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 353937 for (band = 0; band < nsubbands; band++) {
825 342810 int32_t *samples = s->subband_samples[ch][band] - DCA_ADPCM_COEFFS;
826 342810 AV_COPY128(samples, samples + s->npcmblocks);
827 }
828
829 // Clear inactive subbands
830
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 24381 for (; band < DCA_SUBBANDS; band++) {
831 13254 int32_t *samples = s->subband_samples[ch][band] - DCA_ADPCM_COEFFS;
832 13254 memset(samples, 0, (DCA_ADPCM_COEFFS + s->npcmblocks) * sizeof(int32_t));
833 }
834 }
835
836 2772 return 0;
837 }
838
839 279 static int parse_xch_frame(DCACoreDecoder *s)
840 {
841 int ret;
842
843
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 279 if (s->ch_mask & DCA_SPEAKER_MASK_Cs) {
844 ✗ av_log(s->avctx, AV_LOG_ERROR, "XCH with Cs speaker already present\n");
845 ✗ return AVERROR_INVALIDDATA;
846 }
847
848
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 279 if ((ret = parse_frame_data(s, HEADER_XCH, s->nchannels)) < 0)
849 ✗ return ret;
850
851 // Seek to the end of core frame, don't trust XCH frame size
852
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 279 if (ff_dca_seek_bits(&s->gb, s->frame_size * 8)) {
853 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XCH frame\n");
854 ✗ return AVERROR_INVALIDDATA;
855 }
856
857 279 return 0;
858 }
859
860 21 static int parse_xxch_frame(DCACoreDecoder *s)
861 {
862 int xxch_nchsets, xxch_frame_size;
863 21 int ret, mask, header_size, header_pos = get_bits_count(&s->gb);
864
865 // XXCH sync word
866
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 21 if (get_bits_long(&s->gb, 32) != DCA_SYNCWORD_XXCH) {
867 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH sync word\n");
868 ✗ return AVERROR_INVALIDDATA;
869 }
870
871 // XXCH frame header length
872 21 header_size = get_bits(&s->gb, 6) + 1;
873
874 // Check XXCH frame header CRC
875
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 21 if (ff_dca_check_crc(s->avctx, &s->gb, header_pos + 32, header_pos + header_size * 8)) {
876 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XXCH frame header checksum\n");
877 ✗ return AVERROR_INVALIDDATA;
878 }
879
880 // CRC presence flag for channel set header
881 21 s->xxch_crc_present = get_bits1(&s->gb);
882
883 // Number of bits for loudspeaker mask
884 21 s->xxch_mask_nbits = get_bits(&s->gb, 5) + 1;
885
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 21 if (s->xxch_mask_nbits <= DCA_SPEAKER_Cs) {
886 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of bits for XXCH speaker mask (%d)\n", s->xxch_mask_nbits);
887 ✗ return AVERROR_INVALIDDATA;
888 }
889
890 // Number of channel sets
891 21 xxch_nchsets = get_bits(&s->gb, 2) + 1;
892
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 21 if (xxch_nchsets > 1) {
893 ✗ avpriv_request_sample(s->avctx, "%d XXCH channel sets", xxch_nchsets);
894 ✗ return AVERROR_PATCHWELCOME;
895 }
896
897 // Channel set 0 data byte size
898 21 xxch_frame_size = get_bits(&s->gb, 14) + 1;
899
900 // Core loudspeaker activity mask
901 21 s->xxch_core_mask = get_bits_long(&s->gb, s->xxch_mask_nbits);
902
903 // Validate the core mask
904 21 mask = s->ch_mask;
905
906
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 21 if ((mask & DCA_SPEAKER_MASK_Ls) && (s->xxch_core_mask & DCA_SPEAKER_MASK_Lss))
907 21 mask = (mask & ~DCA_SPEAKER_MASK_Ls) | DCA_SPEAKER_MASK_Lss;
908
909
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 21 if ((mask & DCA_SPEAKER_MASK_Rs) && (s->xxch_core_mask & DCA_SPEAKER_MASK_Rss))
910 21 mask = (mask & ~DCA_SPEAKER_MASK_Rs) | DCA_SPEAKER_MASK_Rss;
911
912
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 21 if (mask != s->xxch_core_mask) {
913 ✗ av_log(s->avctx, AV_LOG_ERROR, "XXCH core speaker activity mask (%#x) disagrees with core (%#x)\n", s->xxch_core_mask, mask);
914 ✗ return AVERROR_INVALIDDATA;
915 }
916
917 // Reserved
918 // Byte align
919 // CRC16 of XXCH frame header
920
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 21 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) {
921 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XXCH frame header\n");
922 ✗ return AVERROR_INVALIDDATA;
923 }
924
925 // Parse XXCH channel set 0
926
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 21 if ((ret = parse_frame_data(s, HEADER_XXCH, s->nchannels)) < 0)
927 ✗ return ret;
928
929
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 21 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8 + xxch_frame_size * 8)) {
930 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XXCH channel set\n");
931 ✗ return AVERROR_INVALIDDATA;
932 }
933
934 21 return 0;
935 }
936
937 28 static int parse_xbr_subframe(DCACoreDecoder *s, int xbr_base_ch, int xbr_nchannels,
938 int *xbr_nsubbands, int xbr_transition_mode, int sf, int *sub_pos)
939 {
940 int xbr_nabits[DCA_CHANNELS];
941 int xbr_bit_allocation[DCA_CHANNELS][DCA_SUBBANDS];
942 int xbr_scale_nbits[DCA_CHANNELS];
943 int32_t xbr_scale_factors[DCA_CHANNELS][DCA_SUBBANDS][2];
944 int ssf, ch, band, ofs;
945
946 // Check number of subband samples in this subframe
947
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 28 if (*sub_pos + s->nsubsubframes[sf] * DCA_SUBBAND_SAMPLES > s->npcmblocks) {
948 ✗ av_log(s->avctx, AV_LOG_ERROR, "Subband sample buffer overflow\n");
949 ✗ return AVERROR_INVALIDDATA;
950 }
951
952
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 28 if (get_bits_left(&s->gb) < 0)
953 ✗ return AVERROR_INVALIDDATA;
954
955 // Number of bits for XBR bit allocation index
956
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 140 for (ch = xbr_base_ch; ch < xbr_nchannels; ch++)
957 112 xbr_nabits[ch] = get_bits(&s->gb, 2) + 2;
958
959 // XBR bit allocation index
960
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 140 for (ch = xbr_base_ch; ch < xbr_nchannels; ch++) {
961
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 3696 for (band = 0; band < xbr_nsubbands[ch]; band++) {
962 3584 xbr_bit_allocation[ch][band] = get_bits(&s->gb, xbr_nabits[ch]);
963
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 3584 if (xbr_bit_allocation[ch][band] > DCA_ABITS_MAX) {
964 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XBR bit allocation index\n");
965 ✗ return AVERROR_INVALIDDATA;
966 }
967 }
968 }
969
970 // Number of bits for scale indices
971
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 140 for (ch = xbr_base_ch; ch < xbr_nchannels; ch++) {
972 112 xbr_scale_nbits[ch] = get_bits(&s->gb, 3);
973
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 112 if (!xbr_scale_nbits[ch]) {
974 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of bits for XBR scale factor index\n");
975 ✗ return AVERROR_INVALIDDATA;
976 }
977 }
978
979 // XBR scale factors
980
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 140 for (ch = xbr_base_ch; ch < xbr_nchannels; ch++) {
981 const uint32_t *scale_table;
982 int scale_size;
983
984 // Select the root square table
985
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 112 if (s->scale_factor_sel[ch] > 5) {
986 112 scale_table = ff_dca_scale_factor_quant7;
987 112 scale_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant7);
988 } else {
989 ✗ scale_table = ff_dca_scale_factor_quant6;
990 ✗ scale_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant6);
991 }
992
993 // Parse scale factor indices and look up scale factors from the root
994 // square table
995
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 3696 for (band = 0; band < xbr_nsubbands[ch]; band++) {
996
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 3584 if (xbr_bit_allocation[ch][band]) {
997 2331 int scale_index = get_bits(&s->gb, xbr_scale_nbits[ch]);
998
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 2331 if (scale_index >= scale_size) {
999 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XBR scale factor index\n");
1000 ✗ return AVERROR_INVALIDDATA;
1001 }
1002 2331 xbr_scale_factors[ch][band][0] = scale_table[scale_index];
1003
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 2331 if (xbr_transition_mode && s->transition_mode[sf][ch][band]) {
1004 ✗ scale_index = get_bits(&s->gb, xbr_scale_nbits[ch]);
1005 ✗ if (scale_index >= scale_size) {
1006 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XBR scale factor index\n");
1007 ✗ return AVERROR_INVALIDDATA;
1008 }
1009 ✗ xbr_scale_factors[ch][band][1] = scale_table[scale_index];
1010 }
1011 }
1012 }
1013 }
1014
1015 // Audio data
1016
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 84 for (ssf = 0, ofs = *sub_pos; ssf < s->nsubsubframes[sf]; ssf++) {
1017
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 280 for (ch = xbr_base_ch; ch < xbr_nchannels; ch++) {
1018
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 224 if (get_bits_left(&s->gb) < 0)
1019 ✗ return AVERROR_INVALIDDATA;
1020
1021
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 7392 for (band = 0; band < xbr_nsubbands[ch]; band++) {
1022 7168 int ret, trans_ssf, abits = xbr_bit_allocation[ch][band];
1023 int32_t audio[DCA_SUBBAND_SAMPLES], step_size, scale;
1024
1025 // Extract bits from the bit stream
1026
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 7168 if (abits > 7) {
1027 // No further encoding
1028 3568 get_array(&s->gb, audio, DCA_SUBBAND_SAMPLES, abits - 3);
1029
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 3600 } else if (abits > 0) {
1030 // Block codes
1031
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 1094 if ((ret = parse_block_codes(s, audio, abits)) < 0)
1032 ✗ return ret;
1033 } else {
1034 // No bits allocated
1035 2506 continue;
1036 }
1037
1038 // Look up quantization step size
1039 4662 step_size = ff_dca_lossless_quant[abits];
1040
1041 // Identify transient location
1042
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 4662 if (xbr_transition_mode)
1043 ✗ trans_ssf = s->transition_mode[sf][ch][band];
1044 else
1045 4662 trans_ssf = 0;
1046
1047 // Determine proper scale factor
1048
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 4662 if (trans_ssf == 0 || ssf < trans_ssf)
1049 4662 scale = xbr_scale_factors[ch][band][0];
1050 else
1051 ✗ scale = xbr_scale_factors[ch][band][1];
1052
1053 4662 ff_dca_core_dequantize(s->subband_samples[ch][band] + ofs,
1054 audio, step_size, scale, 1, DCA_SUBBAND_SAMPLES);
1055 }
1056 }
1057
1058 // DSYNC
1059
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 56 if ((ssf == s->nsubsubframes[sf] - 1 || s->sync_ssf) && get_bits(&s->gb, 16) != 0xffff) {
1060 ✗ av_log(s->avctx, AV_LOG_ERROR, "XBR-DSYNC check failed\n");
1061 ✗ return AVERROR_INVALIDDATA;
1062 }
1063
1064 56 ofs += DCA_SUBBAND_SAMPLES;
1065 }
1066
1067 // Advance subband sample pointer for the next subframe
1068 28 *sub_pos = ofs;
1069 28 return 0;
1070 }
1071
1072 21 static int parse_xbr_frame(DCACoreDecoder *s)
1073 {
1074 int xbr_frame_size[DCA_EXSS_CHSETS_MAX];
1075 int xbr_nchannels[DCA_EXSS_CHSETS_MAX];
1076 int xbr_nsubbands[DCA_EXSS_CHSETS_MAX * DCA_EXSS_CHANNELS_MAX];
1077 int xbr_nchsets, xbr_transition_mode, xbr_band_nbits, xbr_base_ch;
1078 21 int i, ch1, ch2, ret, header_size, header_pos = get_bits_count(&s->gb);
1079
1080 // XBR sync word
1081
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 21 if (get_bits_long(&s->gb, 32) != DCA_SYNCWORD_XBR) {
1082 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XBR sync word\n");
1083 ✗ return AVERROR_INVALIDDATA;
1084 }
1085
1086 // XBR frame header length
1087 21 header_size = get_bits(&s->gb, 6) + 1;
1088
1089 // Check XBR frame header CRC
1090
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 21 if (ff_dca_check_crc(s->avctx, &s->gb, header_pos + 32, header_pos + header_size * 8)) {
1091 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid XBR frame header checksum\n");
1092 ✗ return AVERROR_INVALIDDATA;
1093 }
1094
1095 // Number of channel sets
1096 21 xbr_nchsets = get_bits(&s->gb, 2) + 1;
1097
1098 // Channel set data byte size
1099
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 49 for (i = 0; i < xbr_nchsets; i++)
1100 28 xbr_frame_size[i] = get_bits(&s->gb, 14) + 1;
1101
1102 // Transition mode flag
1103 21 xbr_transition_mode = get_bits1(&s->gb);
1104
1105 // Channel set headers
1106
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 49 for (i = 0, ch2 = 0; i < xbr_nchsets; i++) {
1107 28 xbr_nchannels[i] = get_bits(&s->gb, 3) + 1;
1108 28 xbr_band_nbits = get_bits(&s->gb, 2) + 5;
1109
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 140 for (ch1 = 0; ch1 < xbr_nchannels[i]; ch1++, ch2++) {
1110 112 xbr_nsubbands[ch2] = get_bits(&s->gb, xbr_band_nbits) + 1;
1111
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 112 if (xbr_nsubbands[ch2] > DCA_SUBBANDS) {
1112 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of active XBR subbands (%d)\n", xbr_nsubbands[ch2]);
1113 ✗ return AVERROR_INVALIDDATA;
1114 }
1115 }
1116 }
1117
1118 // Reserved
1119 // Byte align
1120 // CRC16 of XBR frame header
1121
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 21 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) {
1122 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XBR frame header\n");
1123 ✗ return AVERROR_INVALIDDATA;
1124 }
1125
1126 // Channel set data
1127
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 49 for (i = 0, xbr_base_ch = 0; i < xbr_nchsets; i++) {
1128 28 header_pos = get_bits_count(&s->gb);
1129
1130
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 28 if (xbr_base_ch + xbr_nchannels[i] <= s->nchannels) {
1131 int sf, sub_pos;
1132
1133
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 56 for (sf = 0, sub_pos = 0; sf < s->nsubframes; sf++) {
1134
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 28 if ((ret = parse_xbr_subframe(s, xbr_base_ch,
1135 28 xbr_base_ch + xbr_nchannels[i],
1136 xbr_nsubbands, xbr_transition_mode,
1137 sf, &sub_pos)) < 0)
1138 ✗ return ret;
1139 }
1140 }
1141
1142 28 xbr_base_ch += xbr_nchannels[i];
1143
1144
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 28 if (ff_dca_seek_bits(&s->gb, header_pos + xbr_frame_size[i] * 8)) {
1145 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of XBR channel set\n");
1146 ✗ return AVERROR_INVALIDDATA;
1147 }
1148 }
1149
1150 21 return 0;
1151 }
1152
1153 // Modified ISO/IEC 9899 linear congruential generator
1154 // Returns pseudorandom integer in range [-2^30, 2^30 - 1]
1155 ✗ static int rand_x96(DCACoreDecoder *s)
1156 {
1157 ✗ s->x96_rand = 1103515245U * s->x96_rand + 12345U;
1158 ✗ return (s->x96_rand & 0x7fffffff) - 0x40000000;
1159 }
1160
1161 49 static int parse_x96_subframe_audio(DCACoreDecoder *s, int sf, int xch_base, int *sub_pos)
1162 {
1163 int n, ssf, ch, band, ofs;
1164
1165 // Check number of subband samples in this subframe
1166 49 int nsamples = s->nsubsubframes[sf] * DCA_SUBBAND_SAMPLES;
1167
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 49 if (*sub_pos + nsamples > s->npcmblocks) {
1168 ✗ av_log(s->avctx, AV_LOG_ERROR, "Subband sample buffer overflow\n");
1169 ✗ return AVERROR_INVALIDDATA;
1170 }
1171
1172
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 49 if (get_bits_left(&s->gb) < 0)
1173 ✗ return AVERROR_INVALIDDATA;
1174
1175 // VQ encoded or unallocated subbands
1176
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1177
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 9331 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++) {
1178 // Get the sample pointer and scale factor
1179 9135 int32_t *samples = s->x96_subband_samples[ch][band] + *sub_pos;
1180 9135 int32_t scale = s->scale_factors[ch][band >> 1][band & 1];
1181
1182
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 9135 switch (s->bit_allocation[ch][band]) {
1183 ✗ case 0: // No bits allocated for subband
1184 ✗ if (scale <= 1)
1185 ✗ memset(samples, 0, nsamples * sizeof(int32_t));
1186 ✗ else for (n = 0; n < nsamples; n++)
1187 // Generate scaled random samples
1188 ✗ samples[n] = mul31(rand_x96(s), scale);
1189 ✗ break;
1190
1191 2727 case 1: // VQ encoded subband
1192
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 5454 for (ssf = 0; ssf < (s->nsubsubframes[sf] + 1) / 2; ssf++) {
1193 // Extract the VQ address from the bit stream and look up
1194 // the VQ code book for up to 16 subband samples
1195 2727 const int8_t *vq_samples = ff_dca_high_freq_vq[get_bits(&s->gb, 10)];
1196 // Scale and take the samples
1197
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 46359 for (n = 0; n < FFMIN(nsamples - ssf * 16, 16); n++)
1198 43632 *samples++ = clip23(vq_samples[n] * scale + (1 << 3) >> 4);
1199 }
1200 2727 break;
1201 }
1202 }
1203 }
1204
1205 // Audio data
1206
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 147 for (ssf = 0, ofs = *sub_pos; ssf < s->nsubsubframes[sf]; ssf++) {
1207
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 490 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1208
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 392 if (get_bits_left(&s->gb) < 0)
1209 ✗ return AVERROR_INVALIDDATA;
1210
1211
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 18662 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++) {
1212 18270 int ret, abits = s->bit_allocation[ch][band] - 1;
1213 int32_t audio[DCA_SUBBAND_SAMPLES], step_size, scale;
1214
1215 // Not VQ encoded or unallocated subbands
1216
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 18270 if (abits < 1)
1217 5454 continue;
1218
1219 // Extract bits from the bit stream
1220
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 12816 if ((ret = extract_audio(s, audio, abits, ch)) < 0)
1221 ✗ return ret;
1222
1223 // Select quantization step size table and look up quantization
1224 // step size
1225
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 12816 if (s->bit_rate == 3)
1226 ✗ step_size = ff_dca_lossless_quant[abits];
1227 else
1228 12816 step_size = ff_dca_lossy_quant[abits];
1229
1230 // Get the scale factor
1231 12816 scale = s->scale_factors[ch][band >> 1][band & 1];
1232
1233 12816 ff_dca_core_dequantize(s->x96_subband_samples[ch][band] + ofs,
1234 audio, step_size, scale, 0, DCA_SUBBAND_SAMPLES);
1235 }
1236 }
1237
1238 // DSYNC
1239
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 98 if ((ssf == s->nsubsubframes[sf] - 1 || s->sync_ssf) && get_bits(&s->gb, 16) != 0xffff) {
1240 ✗ av_log(s->avctx, AV_LOG_ERROR, "X96-DSYNC check failed\n");
1241 ✗ return AVERROR_INVALIDDATA;
1242 }
1243
1244 98 ofs += DCA_SUBBAND_SAMPLES;
1245 }
1246
1247 // Inverse ADPCM
1248
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1249 196 inverse_adpcm(s->x96_subband_samples[ch], s->prediction_vq_index[ch],
1250 196 s->prediction_mode[ch], s->x96_subband_start, s->nsubbands[ch],
1251 *sub_pos, nsamples);
1252 }
1253
1254 // Joint subband coding
1255
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1256 196 int src_ch = s->joint_intensity_index[ch] - 1;
1257
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 196 if (src_ch >= 0) {
1258 77 s->dcadsp->decode_joint(s->x96_subband_samples[ch], s->x96_subband_samples[src_ch],
1259 77 s->joint_scale_factors[ch], s->nsubbands[ch],
1260 77 s->nsubbands[src_ch], *sub_pos, nsamples);
1261 }
1262 }
1263
1264 // Advance subband sample pointer for the next subframe
1265 49 *sub_pos = ofs;
1266 49 return 0;
1267 }
1268
1269 ✗ static void erase_x96_adpcm_history(DCACoreDecoder *s)
1270 {
1271 int ch, band;
1272
1273 // Erase ADPCM history from previous frame if
1274 // predictor history switch was disabled
1275 ✗ for (ch = 0; ch < DCA_CHANNELS; ch++)
1276 ✗ for (band = 0; band < DCA_SUBBANDS_X96; band++)
1277 ✗ AV_ZERO128(s->x96_subband_samples[ch][band] - DCA_ADPCM_COEFFS);
1278 ✗ }
1279
1280 35 static int alloc_x96_sample_buffer(DCACoreDecoder *s)
1281 {
1282 35 int nchsamples = DCA_ADPCM_COEFFS + s->npcmblocks;
1283 35 int nframesamples = nchsamples * DCA_CHANNELS * DCA_SUBBANDS_X96;
1284 35 unsigned int size = s->x96_subband_size;
1285 int ch, band;
1286
1287 // Reallocate subband sample buffer
1288 35 av_fast_mallocz(&s->x96_subband_buffer, &s->x96_subband_size,
1289 nframesamples * sizeof(int32_t));
1290
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 35 if (!s->x96_subband_buffer)
1291 ✗ return AVERROR(ENOMEM);
1292
1293
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 35 if (size != s->x96_subband_size) {
1294
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 80 for (ch = 0; ch < DCA_CHANNELS; ch++)
1295
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 4550 for (band = 0; band < DCA_SUBBANDS_X96; band++)
1296 4480 s->x96_subband_samples[ch][band] = s->x96_subband_buffer +
1297 4480 (ch * DCA_SUBBANDS_X96 + band) * nchsamples + DCA_ADPCM_COEFFS;
1298 }
1299
1300
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 35 if (!s->predictor_history)
1301 ✗ erase_x96_adpcm_history(s);
1302
1303 35 return 0;
1304 }
1305
1306 49 static int parse_x96_subframe_header(DCACoreDecoder *s, int xch_base)
1307 {
1308 int ch, band, ret;
1309
1310
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 49 if (get_bits_left(&s->gb) < 0)
1311 ✗ return AVERROR_INVALIDDATA;
1312
1313 // Prediction mode
1314
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++)
1315
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 9331 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++)
1316 9135 s->prediction_mode[ch][band] = get_bits1(&s->gb);
1317
1318 // Prediction coefficients VQ address
1319
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++)
1320
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 9331 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++)
1321
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 9135 if (s->prediction_mode[ch][band])
1322 47 s->prediction_vq_index[ch][band] = get_bits(&s->gb, 12);
1323
1324 // Bit allocation index
1325
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1326 196 int sel = s->bit_allocation_sel[ch];
1327 196 int abits = 0;
1328
1329
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 9331 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++) {
1330 // If Huffman code was used, the difference of abits was encoded
1331
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 9135 if (sel < 7)
1332 9115 abits += dca_get_vlc(&s->gb, &ff_dca_vlc_quant_index[5 + 2 * s->x96_high_res][sel]);
1333 else
1334 20 abits = get_bits(&s->gb, 3 + s->x96_high_res);
1335
1336
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 9135 if (abits < 0 || abits > 7 + 8 * s->x96_high_res) {
1337 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 bit allocation index\n");
1338 ✗ return AVERROR_INVALIDDATA;
1339 }
1340
1341 9135 s->bit_allocation[ch][band] = abits;
1342 }
1343 }
1344
1345 // Scale factors
1346
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1347 196 int sel = s->scale_factor_sel[ch];
1348 196 int scale_index = 0;
1349
1350 // Extract scales for subbands which are transmitted even for
1351 // unallocated subbands
1352
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 9331 for (band = s->x96_subband_start; band < s->nsubbands[ch]; band++) {
1353
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 9135 if ((ret = parse_scale(s, &scale_index, sel)) < 0)
1354 ✗ return ret;
1355 9135 s->scale_factors[ch][band >> 1][band & 1] = ret;
1356 }
1357 }
1358
1359 // Joint subband codebook select
1360
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1361
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 196 if (s->joint_intensity_index[ch]) {
1362 77 s->joint_scale_sel[ch] = get_bits(&s->gb, 3);
1363
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 77 if (s->joint_scale_sel[ch] == 7) {
1364 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 joint scale factor code book\n");
1365 ✗ return AVERROR_INVALIDDATA;
1366 }
1367 }
1368 }
1369
1370 // Scale factors for joint subband coding
1371
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1372 196 int src_ch = s->joint_intensity_index[ch] - 1;
1373
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 196 if (src_ch >= 0) {
1374 77 int sel = s->joint_scale_sel[ch];
1375
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 2541 for (band = s->nsubbands[ch]; band < s->nsubbands[src_ch]; band++) {
1376
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 2464 if ((ret = parse_joint_scale(s, sel)) < 0)
1377 ✗ return ret;
1378 2464 s->joint_scale_factors[ch][band] = ret;
1379 }
1380 }
1381 }
1382
1383 // Side information CRC check word
1384
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 49 if (s->crc_present)
1385 ✗ skip_bits(&s->gb, 16);
1386
1387 49 return 0;
1388 }
1389
1390 49 static int parse_x96_coding_header(DCACoreDecoder *s, int exss, int xch_base)
1391 {
1392 49 int n, ch, header_size = 0, header_pos = get_bits_count(&s->gb);
1393
1394
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 49 if (get_bits_left(&s->gb) < 0)
1395 ✗ return AVERROR_INVALIDDATA;
1396
1397
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 49 if (exss) {
1398 // Channel set header length
1399 42 header_size = get_bits(&s->gb, 7) + 1;
1400
1401 // Check CRC
1402
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 42 if (s->x96_crc_present
1403
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 42 && ff_dca_check_crc(s->avctx, &s->gb, header_pos, header_pos + header_size * 8)) {
1404 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 channel set header checksum\n");
1405 ✗ return AVERROR_INVALIDDATA;
1406 }
1407 }
1408
1409 // High resolution flag
1410 49 s->x96_high_res = get_bits1(&s->gb);
1411
1412 // First encoded subband
1413
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 49 if (s->x96_rev_no < 8) {
1414 49 s->x96_subband_start = get_bits(&s->gb, 5);
1415
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 49 if (s->x96_subband_start > 27) {
1416 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 subband start index (%d)\n", s->x96_subband_start);
1417 ✗ return AVERROR_INVALIDDATA;
1418 }
1419 } else {
1420 ✗ s->x96_subband_start = DCA_SUBBANDS;
1421 }
1422
1423 // Subband activity count
1424
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1425 196 s->nsubbands[ch] = get_bits(&s->gb, 6) + 1;
1426
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 196 if (s->nsubbands[ch] < DCA_SUBBANDS) {
1427 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 subband activity count (%d)\n", s->nsubbands[ch]);
1428 ✗ return AVERROR_INVALIDDATA;
1429 }
1430 }
1431
1432 // Joint intensity coding index
1433
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1434
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 196 if ((n = get_bits(&s->gb, 3)) && xch_base)
1435 7 n += xch_base - 1;
1436
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 196 if (n > s->x96_nchannels) {
1437 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 joint intensity coding index\n");
1438 ✗ return AVERROR_INVALIDDATA;
1439 }
1440 196 s->joint_intensity_index[ch] = n;
1441 }
1442
1443 // Scale factor code book
1444
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1445 196 s->scale_factor_sel[ch] = get_bits(&s->gb, 3);
1446
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 196 if (s->scale_factor_sel[ch] >= 6) {
1447 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 scale factor code book\n");
1448 ✗ return AVERROR_INVALIDDATA;
1449 }
1450 }
1451
1452 // Bit allocation quantizer select
1453
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++)
1454 196 s->bit_allocation_sel[ch] = get_bits(&s->gb, 3);
1455
1456 // Quantization index codebook select
1457
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 399 for (n = 0; n < 6 + 4 * s->x96_high_res; n++)
1458
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 1694 for (ch = xch_base; ch < s->x96_nchannels; ch++)
1459 1344 s->quant_index_sel[ch][n] = get_bits(&s->gb, ff_dca_quant_index_sel_nbits[n]);
1460
1461
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 49 if (exss) {
1462 // Reserved
1463 // Byte align
1464 // CRC16 of channel set header
1465
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 42 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) {
1466 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of X96 channel set header\n");
1467 ✗ return AVERROR_INVALIDDATA;
1468 }
1469 } else {
1470
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 7 if (s->crc_present)
1471 ✗ skip_bits(&s->gb, 16);
1472 }
1473
1474 49 return 0;
1475 }
1476
1477 49 static int parse_x96_frame_data(DCACoreDecoder *s, int exss, int xch_base)
1478 {
1479 int sf, ch, ret, band, sub_pos;
1480
1481
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 49 if ((ret = parse_x96_coding_header(s, exss, xch_base)) < 0)
1482 ✗ return ret;
1483
1484
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 98 for (sf = 0, sub_pos = 0; sf < s->nsubframes; sf++) {
1485
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 49 if ((ret = parse_x96_subframe_header(s, xch_base)) < 0)
1486 ✗ return ret;
1487
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 49 if ((ret = parse_x96_subframe_audio(s, sf, xch_base, &sub_pos)) < 0)
1488 ✗ return ret;
1489 }
1490
1491
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 245 for (ch = xch_base; ch < s->x96_nchannels; ch++) {
1492 // Determine number of active subbands for this channel
1493 196 int nsubbands = s->nsubbands[ch];
1494
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 196 if (s->joint_intensity_index[ch])
1495 77 nsubbands = FFMAX(nsubbands, s->nsubbands[s->joint_intensity_index[ch] - 1]);
1496
1497 // Update history for ADPCM and clear inactive subbands
1498
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 12740 for (band = 0; band < DCA_SUBBANDS_X96; band++) {
1499 12544 int32_t *samples = s->x96_subband_samples[ch][band] - DCA_ADPCM_COEFFS;
1500
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 12544 if (band >= s->x96_subband_start && band < nsubbands)
1501 11599 AV_COPY128(samples, samples + s->npcmblocks);
1502 else
1503 945 memset(samples, 0, (DCA_ADPCM_COEFFS + s->npcmblocks) * sizeof(int32_t));
1504 }
1505 }
1506
1507 49 return 0;
1508 }
1509
1510 7 static int parse_x96_frame(DCACoreDecoder *s)
1511 {
1512 int ret;
1513
1514 // Revision number
1515 7 s->x96_rev_no = get_bits(&s->gb, 4);
1516
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 7 if (s->x96_rev_no < 1 || s->x96_rev_no > 8) {
1517 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 revision (%d)\n", s->x96_rev_no);
1518 ✗ return AVERROR_INVALIDDATA;
1519 }
1520
1521 7 s->x96_crc_present = 0;
1522 7 s->x96_nchannels = s->nchannels;
1523
1524
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 7 if ((ret = alloc_x96_sample_buffer(s)) < 0)
1525 ✗ return ret;
1526
1527
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 7 if ((ret = parse_x96_frame_data(s, 0, 0)) < 0)
1528 ✗ return ret;
1529
1530 // Seek to the end of core frame
1531
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 7 if (ff_dca_seek_bits(&s->gb, s->frame_size * 8)) {
1532 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of X96 frame\n");
1533 ✗ return AVERROR_INVALIDDATA;
1534 }
1535
1536 7 return 0;
1537 }
1538
1539 28 static int parse_x96_frame_exss(DCACoreDecoder *s)
1540 {
1541 int x96_frame_size[DCA_EXSS_CHSETS_MAX];
1542 int x96_nchannels[DCA_EXSS_CHSETS_MAX];
1543 int x96_nchsets, x96_base_ch;
1544 28 int i, ret, header_size, header_pos = get_bits_count(&s->gb);
1545
1546 // X96 sync word
1547
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 28 if (get_bits_long(&s->gb, 32) != DCA_SYNCWORD_X96) {
1548 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 sync word\n");
1549 ✗ return AVERROR_INVALIDDATA;
1550 }
1551
1552 // X96 frame header length
1553 28 header_size = get_bits(&s->gb, 6) + 1;
1554
1555 // Check X96 frame header CRC
1556
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 28 if (ff_dca_check_crc(s->avctx, &s->gb, header_pos + 32, header_pos + header_size * 8)) {
1557 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 frame header checksum\n");
1558 ✗ return AVERROR_INVALIDDATA;
1559 }
1560
1561 // Revision number
1562 28 s->x96_rev_no = get_bits(&s->gb, 4);
1563
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 28 if (s->x96_rev_no < 1 || s->x96_rev_no > 8) {
1564 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid X96 revision (%d)\n", s->x96_rev_no);
1565 ✗ return AVERROR_INVALIDDATA;
1566 }
1567
1568 // CRC presence flag for channel set header
1569 28 s->x96_crc_present = get_bits1(&s->gb);
1570
1571 // Number of channel sets
1572 28 x96_nchsets = get_bits(&s->gb, 2) + 1;
1573
1574 // Channel set data byte size
1575
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 84 for (i = 0; i < x96_nchsets; i++)
1576 56 x96_frame_size[i] = get_bits(&s->gb, 12) + 1;
1577
1578 // Number of channels in channel set
1579
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 84 for (i = 0; i < x96_nchsets; i++)
1580 56 x96_nchannels[i] = get_bits(&s->gb, 3) + 1;
1581
1582 // Reserved
1583 // Byte align
1584 // CRC16 of X96 frame header
1585
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 28 if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) {
1586 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of X96 frame header\n");
1587 ✗ return AVERROR_INVALIDDATA;
1588 }
1589
1590
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 28 if ((ret = alloc_x96_sample_buffer(s)) < 0)
1591 ✗ return ret;
1592
1593 // Channel set data
1594 28 s->x96_nchannels = 0;
1595
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 84 for (i = 0, x96_base_ch = 0; i < x96_nchsets; i++) {
1596 56 header_pos = get_bits_count(&s->gb);
1597
1598
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 56 if (x96_base_ch + x96_nchannels[i] <= s->nchannels) {
1599 42 s->x96_nchannels = x96_base_ch + x96_nchannels[i];
1600
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 42 if ((ret = parse_x96_frame_data(s, 1, x96_base_ch)) < 0)
1601 ✗ return ret;
1602 }
1603
1604 56 x96_base_ch += x96_nchannels[i];
1605
1606
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 56 if (ff_dca_seek_bits(&s->gb, header_pos + x96_frame_size[i] * 8)) {
1607 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of X96 channel set\n");
1608 ✗ return AVERROR_INVALIDDATA;
1609 }
1610 }
1611
1612 28 return 0;
1613 }
1614
1615 77 static int parse_aux_data(DCACoreDecoder *s)
1616 {
1617 int aux_pos;
1618
1619
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 77 if (get_bits_left(&s->gb) < 0)
1620 ✗ return AVERROR_INVALIDDATA;
1621
1622 // Auxiliary data byte count (can't be trusted)
1623 77 skip_bits(&s->gb, 6);
1624
1625 // 4-byte align
1626 77 skip_bits_long(&s->gb, -get_bits_count(&s->gb) & 31);
1627
1628 // Auxiliary data sync word
1629
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 77 if (get_bits_long(&s->gb, 32) != DCA_SYNCWORD_REV1AUX) {
1630 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid auxiliary data sync word\n");
1631 ✗ return AVERROR_INVALIDDATA;
1632 }
1633
1634 77 aux_pos = get_bits_count(&s->gb);
1635
1636 // Auxiliary decode time stamp flag
1637
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 77 if (get_bits1(&s->gb))
1638 ✗ skip_bits_long(&s->gb, 47);
1639
1640 // Auxiliary dynamic downmix flag
1641
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 77 if (s->prim_dmix_embedded = get_bits1(&s->gb)) {
1642 int i, m, n;
1643
1644 // Auxiliary primary channel downmix type
1645 77 s->prim_dmix_type = get_bits(&s->gb, 3);
1646
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 77 if (s->prim_dmix_type >= DCA_DMIX_TYPE_COUNT) {
1647 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid primary channel set downmix type\n");
1648 ✗ return AVERROR_INVALIDDATA;
1649 }
1650
1651 // Size of downmix coefficients matrix
1652 77 m = ff_dca_dmix_primary_nch[s->prim_dmix_type];
1653 77 n = ff_dca_channels[s->audio_mode] + !!s->lfe_present;
1654
1655 // Dynamic downmix code coefficients
1656
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 1001 for (i = 0; i < m * n; i++) {
1657 924 int code = get_bits(&s->gb, 9);
1658 924 int sign = (code >> 8) - 1;
1659 924 unsigned int index = code & 0xff;
1660
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 924 if (index >= FF_DCA_DMIXTABLE_SIZE) {
1661 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid downmix coefficient index\n");
1662 ✗ return AVERROR_INVALIDDATA;
1663 }
1664 924 s->prim_dmix_coeff[i] = (ff_dca_dmixtable[index] ^ sign) - sign;
1665 }
1666 }
1667
1668 // Byte align
1669 77 skip_bits(&s->gb, -get_bits_count(&s->gb) & 7);
1670
1671 // CRC16 of auxiliary data
1672 77 skip_bits(&s->gb, 16);
1673
1674 // Check CRC
1675
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 77 if (ff_dca_check_crc(s->avctx, &s->gb, aux_pos, get_bits_count(&s->gb))) {
1676 ✗ av_log(s->avctx, AV_LOG_ERROR, "Invalid auxiliary data checksum\n");
1677 ✗ return AVERROR_INVALIDDATA;
1678 }
1679
1680 77 return 0;
1681 }
1682
1683 2472 static int parse_optional_info(DCACoreDecoder *s)
1684 {
1685 2472 DCAContext *dca = s->avctx->priv_data;
1686 2472 int ret = -1;
1687
1688 // Time code stamp
1689
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 2472 if (s->ts_present)
1690 ✗ skip_bits_long(&s->gb, 32);
1691
1692 // Auxiliary data
1693
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 2472 if (s->aux_present && (ret = parse_aux_data(s)) < 0
1694 ✗ && (s->avctx->err_recognition & AV_EF_EXPLODE))
1695 ✗ return ret;
1696
1697
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 2472 if (ret < 0)
1698 2395 s->prim_dmix_embedded = 0;
1699
1700 // Core extensions
1701
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 2472 if (s->ext_audio_present && !dca->core_only) {
1702 328 int sync_pos = FFMIN(s->frame_size / 4, s->gb.size_in_bits / 32) - 1;
1703 328 int last_pos = get_bits_count(&s->gb) / 32;
1704 int size, dist;
1705 328 uint32_t w1, w2 = 0;
1706
1707 // Search for extension sync words aligned on 4-byte boundary. Search
1708 // must be done backwards from the end of core frame to work around
1709 // sync word aliasing issues.
1710
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 328 switch (s->ext_audio_type) {
1711 300 case DCA_EXT_AUDIO_XCH:
1712
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 300 if (dca->request_channel_layout)
1713 21 break;
1714
1715 // The distance between XCH sync word and end of the core frame
1716 // must be equal to XCH frame size. Off by one error is allowed for
1717 // compatibility with legacy bitstreams. Minimum XCH frame size is
1718 // 96 bytes. AMODE and PCHS are further checked to reduce
1719 // probability of alias sync detection.
1720
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 19253 for (; sync_pos >= last_pos; sync_pos--, w2 = w1) {
1721 19253 w1 = AV_RB32(s->gb.buffer + sync_pos * 4);
1722
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 19253 if (w1 == DCA_SYNCWORD_XCH) {
1723 279 size = (w2 >> 22) + 1;
1724 279 dist = s->frame_size - sync_pos * 4;
1725
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 279 if (size >= 96
1726
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 279 && (size == dist || size - 1 == dist)
1727
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 279 && (w2 >> 15 & 0x7f) == 0x08) {
1728 279 s->xch_pos = sync_pos * 32 + 49;
1729 279 break;
1730 }
1731 }
1732 }
1733
1734
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 279 if (!s->xch_pos) {
1735 ✗ av_log(s->avctx, AV_LOG_ERROR, "XCH sync word not found\n");
1736 ✗ if (s->avctx->err_recognition & AV_EF_EXPLODE)
1737 ✗ return AVERROR_INVALIDDATA;
1738 }
1739 279 break;
1740
1741 28 case DCA_EXT_AUDIO_X96:
1742 // The distance between X96 sync word and end of the core frame
1743 // must be equal to X96 frame size. Minimum X96 frame size is 96
1744 // bytes.
1745
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 3172 for (; sync_pos >= last_pos; sync_pos--, w2 = w1) {
1746 3172 w1 = AV_RB32(s->gb.buffer + sync_pos * 4);
1747
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 3172 if (w1 == DCA_SYNCWORD_X96) {
1748 28 size = (w2 >> 20) + 1;
1749 28 dist = s->frame_size - sync_pos * 4;
1750
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 28 if (size >= 96 && size == dist) {
1751 28 s->x96_pos = sync_pos * 32 + 44;
1752 28 break;
1753 }
1754 }
1755 }
1756
1757
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 28 if (!s->x96_pos) {
1758 ✗ av_log(s->avctx, AV_LOG_ERROR, "X96 sync word not found\n");
1759 ✗ if (s->avctx->err_recognition & AV_EF_EXPLODE)
1760 ✗ return AVERROR_INVALIDDATA;
1761 }
1762 28 break;
1763
1764 ✗ case DCA_EXT_AUDIO_XXCH:
1765 ✗ if (dca->request_channel_layout)
1766 ✗ break;
1767
1768 // XXCH frame header CRC must be valid. Minimum XXCH frame header
1769 // size is 11 bytes.
1770 ✗ for (; sync_pos >= last_pos; sync_pos--, w2 = w1) {
1771 ✗ w1 = AV_RB32(s->gb.buffer + sync_pos * 4);
1772 ✗ if (w1 == DCA_SYNCWORD_XXCH) {
1773 ✗ size = (w2 >> 26) + 1;
1774 ✗ dist = s->gb.size_in_bits / 8 - sync_pos * 4;
1775 ✗ if (size >= 11 && size <= dist &&
1776 ✗ !av_crc(dca->crctab, 0xffff, s->gb.buffer +
1777 ✗ (sync_pos + 1) * 4, size - 4)) {
1778 ✗ s->xxch_pos = sync_pos * 32;
1779 ✗ break;
1780 }
1781 }
1782 }
1783
1784 ✗ if (!s->xxch_pos) {
1785 ✗ av_log(s->avctx, AV_LOG_ERROR, "XXCH sync word not found\n");
1786 ✗ if (s->avctx->err_recognition & AV_EF_EXPLODE)
1787 ✗ return AVERROR_INVALIDDATA;
1788 }
1789 ✗ break;
1790 }
1791 }
1792
1793 2472 return 0;
1794 }
1795
1796 2472 int ff_dca_core_parse(DCACoreDecoder *s, const uint8_t *data, int size)
1797 {
1798 int ret;
1799
1800 2472 s->ext_audio_mask = 0;
1801 2472 s->xch_pos = s->xxch_pos = s->x96_pos = 0;
1802
1803
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 2472 if ((ret = init_get_bits8(&s->gb, data, size)) < 0)
1804 ✗ return ret;
1805 2472 s->gb_in = s->gb;
1806
1807
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 2472 if ((ret = parse_frame_header(s)) < 0)
1808 ✗ return ret;
1809
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 2472 if ((ret = alloc_sample_buffer(s)) < 0)
1810 ✗ return ret;
1811
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 2472 if ((ret = parse_frame_data(s, HEADER_CORE, 0)) < 0)
1812 ✗ return ret;
1813
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 2472 if ((ret = parse_optional_info(s)) < 0)
1814 ✗ return ret;
1815
1816 // Workaround for DTS in WAV
1817
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 2472 if (s->frame_size > size)
1818 ✗ s->frame_size = size;
1819
1820
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 2472 if (ff_dca_seek_bits(&s->gb, s->frame_size * 8)) {
1821 ✗ av_log(s->avctx, AV_LOG_ERROR, "Read past end of core frame\n");
1822 ✗ if (s->avctx->err_recognition & AV_EF_EXPLODE)
1823 ✗ return AVERROR_INVALIDDATA;
1824 }
1825
1826 2472 return 0;
1827 }
1828
1829 2472 int ff_dca_core_parse_exss(DCACoreDecoder *s, const uint8_t *data, DCAExssAsset *asset)
1830 {
1831 2472 AVCodecContext *avctx = s->avctx;
1832 2472 DCAContext *dca = avctx->priv_data;
1833
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 2472 int exss_mask = asset ? asset->extension_mask : 0;
1834 2472 int ret = 0, ext = 0;
1835
1836 // Parse (X)XCH unless downmixing
1837
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 2472 if (!dca->request_channel_layout) {
1838
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 2332 if (exss_mask & DCA_EXSS_XXCH) {
1839
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 21 if ((ret = init_get_bits8(&s->gb, data + asset->xxch_offset, asset->xxch_size)) < 0)
1840 ✗ return ret;
1841 21 ret = parse_xxch_frame(s);
1842 21 ext = DCA_EXSS_XXCH;
1843
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 2311 } else if (s->xxch_pos) {
1844 ✗ s->gb = s->gb_in;
1845 ✗ skip_bits_long(&s->gb, s->xxch_pos);
1846 ✗ ret = parse_xxch_frame(s);
1847 ✗ ext = DCA_CSS_XXCH;
1848
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 2311 } else if (s->xch_pos) {
1849 279 s->gb = s->gb_in;
1850 279 skip_bits_long(&s->gb, s->xch_pos);
1851 279 ret = parse_xch_frame(s);
1852 279 ext = DCA_CSS_XCH;
1853 }
1854
1855 // Revert to primary channel set in case (X)XCH parsing fails
1856
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 2332 if (ret < 0) {
1857 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
1858 ✗ return ret;
1859 ✗ s->nchannels = ff_dca_channels[s->audio_mode];
1860 ✗ s->ch_mask = audio_mode_ch_mask[s->audio_mode];
1861 ✗ if (s->lfe_present)
1862 ✗ s->ch_mask |= DCA_SPEAKER_MASK_LFE1;
1863 } else {
1864 2332 s->ext_audio_mask |= ext;
1865 }
1866 }
1867
1868 // Parse XBR
1869
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 2472 if (exss_mask & DCA_EXSS_XBR) {
1870
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 21 if ((ret = init_get_bits8(&s->gb, data + asset->xbr_offset, asset->xbr_size)) < 0)
1871 ✗ return ret;
1872
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 21 if ((ret = parse_xbr_frame(s)) < 0) {
1873 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
1874 ✗ return ret;
1875 } else {
1876 21 s->ext_audio_mask |= DCA_EXSS_XBR;
1877 }
1878 }
1879
1880 // Parse X96 unless decoding XLL
1881
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 2472 if (!(dca->packet & DCA_PACKET_XLL)) {
1882
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 1127 if (exss_mask & DCA_EXSS_X96) {
1883
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 28 if ((ret = init_get_bits8(&s->gb, data + asset->x96_offset, asset->x96_size)) < 0)
1884 ✗ return ret;
1885
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 28 if ((ret = parse_x96_frame_exss(s)) < 0) {
1886 ✗ if (ret == AVERROR(ENOMEM) || (avctx->err_recognition & AV_EF_EXPLODE))
1887 ✗ return ret;
1888 } else {
1889 28 s->ext_audio_mask |= DCA_EXSS_X96;
1890 }
1891
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 1099 } else if (s->x96_pos) {
1892 7 s->gb = s->gb_in;
1893 7 skip_bits_long(&s->gb, s->x96_pos);
1894
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 7 if ((ret = parse_x96_frame(s)) < 0) {
1895 ✗ if (ret == AVERROR(ENOMEM) || (avctx->err_recognition & AV_EF_EXPLODE))
1896 ✗ return ret;
1897 } else {
1898 7 s->ext_audio_mask |= DCA_CSS_X96;
1899 }
1900 }
1901 }
1902
1903 2472 return 0;
1904 }
1905
1906 11169 static int map_prm_ch_to_spkr(DCACoreDecoder *s, int ch)
1907 {
1908 int pos, spkr;
1909
1910 // Try to map this channel to core first
1911 11169 pos = ff_dca_channels[s->audio_mode];
1912
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 11169 if (ch < pos) {
1913 10806 spkr = prm_ch_to_spkr_map[s->audio_mode][ch];
1914
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 10806 if (s->ext_audio_mask & (DCA_CSS_XXCH | DCA_EXSS_XXCH)) {
1915
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 105 if (s->xxch_core_mask & (1U << spkr))
1916 63 return spkr;
1917
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 42 if (spkr == DCA_SPEAKER_Ls && (s->xxch_core_mask & DCA_SPEAKER_MASK_Lss))
1918 21 return DCA_SPEAKER_Lss;
1919
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 21 if (spkr == DCA_SPEAKER_Rs && (s->xxch_core_mask & DCA_SPEAKER_MASK_Rss))
1920 21 return DCA_SPEAKER_Rss;
1921 ✗ return -1;
1922 }
1923 10701 return spkr;
1924 }
1925
1926 // Then XCH
1927
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 363 if ((s->ext_audio_mask & DCA_CSS_XCH) && ch == pos)
1928 279 return DCA_SPEAKER_Cs;
1929
1930 // Then XXCH
1931
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 84 if (s->ext_audio_mask & (DCA_CSS_XXCH | DCA_EXSS_XXCH)) {
1932
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 210 for (spkr = DCA_SPEAKER_Cs; spkr < s->xxch_mask_nbits; spkr++)
1933
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 210 if (s->xxch_spkr_mask & (1U << spkr))
1934
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 126 if (pos++ == ch)
1935 84 return spkr;
1936 }
1937
1938 // No mapping
1939 ✗ return -1;
1940 }
1941
1942 67 static void erase_dsp_history(DCACoreDecoder *s)
1943 {
1944 67 memset(s->dcadsp_data, 0, sizeof(s->dcadsp_data));
1945 67 s->output_history_lfe_fixed = 0;
1946 67 s->output_history_lfe_float = 0;
1947 67 }
1948
1949 2472 static void set_filter_mode(DCACoreDecoder *s, int mode)
1950 {
1951
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 2472 if (s->filter_mode != mode) {
1952 67 erase_dsp_history(s);
1953 67 s->filter_mode = mode;
1954 }
1955 2472 }
1956
1957 1864 int ff_dca_core_filter_fixed(DCACoreDecoder *s, int x96_synth)
1958 {
1959 1864 int n, ch, spkr, nsamples, x96_nchannels = 0;
1960 const int32_t *filter_coeff;
1961 int32_t *ptr;
1962
1963 // Externally set x96_synth flag implies that X96 synthesis should be
1964 // enabled, yet actual X96 subband data should be discarded. This is a
1965 // special case for lossless residual decoder that ignores X96 data if
1966 // present.
1967
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 1864 if (!x96_synth && (s->ext_audio_mask & (DCA_CSS_X96 | DCA_EXSS_X96))) {
1968 ✗ x96_nchannels = s->x96_nchannels;
1969 ✗ x96_synth = 1;
1970 }
1971
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 1864 if (x96_synth < 0)
1972 1261 x96_synth = 0;
1973
1974 1864 s->output_rate = s->sample_rate << x96_synth;
1975 1864 s->npcmsamples = nsamples = (s->npcmblocks * DCA_PCMBLOCK_SAMPLES) << x96_synth;
1976
1977 // Reallocate PCM output buffer
1978 1864 av_fast_malloc(&s->output_buffer, &s->output_size,
1979 1864 nsamples * av_popcount(s->ch_mask) * sizeof(int32_t));
1980
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 1864 if (!s->output_buffer)
1981 ✗ return AVERROR(ENOMEM);
1982
1983 1864 ptr = (int32_t *)s->output_buffer;
1984
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 61512 for (spkr = 0; spkr < DCA_SPEAKER_COUNT; spkr++) {
1985
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 59648 if (s->ch_mask & (1U << spkr)) {
1986 9123 s->output_samples[spkr] = ptr;
1987 9123 ptr += nsamples;
1988 } else {
1989 50525 s->output_samples[spkr] = NULL;
1990 }
1991 }
1992
1993 // Handle change of filtering mode
1994 1864 set_filter_mode(s, x96_synth | DCA_FILTER_MODE_FIXED);
1995
1996 // Select filter
1997
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 1864 if (x96_synth)
1998 84 filter_coeff = ff_dca_fir_64bands_fixed;
1999
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 1780 else if (s->filter_perfect)
2000 ✗ filter_coeff = ff_dca_fir_32bands_perfect_fixed;
2001 else
2002 1780 filter_coeff = ff_dca_fir_32bands_nonperfect_fixed;
2003
2004 // Filter primary channels
2005
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 9640 for (ch = 0; ch < s->nchannels; ch++) {
2006 // Map this primary channel to speaker
2007 7776 spkr = map_prm_ch_to_spkr(s, ch);
2008
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 7776 if (spkr < 0)
2009 ✗ return AVERROR(EINVAL);
2010
2011 // Filter bank reconstruction
2012 7776 s->dcadsp->sub_qmf_fixed[x96_synth](
2013 &s->synth,
2014 &s->dcadct,
2015 s->output_samples[spkr],
2016 7776 s->subband_samples[ch],
2017 ch < x96_nchannels ? s->x96_subband_samples[ch] : NULL,
2018 7776 s->dcadsp_data[ch].u.fix.hist1,
2019 &s->dcadsp_data[ch].offset,
2020 7776 s->dcadsp_data[ch].u.fix.hist2,
2021 filter_coeff,
2022
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 7776 s->npcmblocks);
2023 }
2024
2025 // Filter LFE channel
2026
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 1864 if (s->lfe_present) {
2027 1347 int32_t *samples = s->output_samples[DCA_SPEAKER_LFE1];
2028 1347 int nlfesamples = s->npcmblocks >> 1;
2029
2030 // Check LFF
2031
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 1347 if (s->lfe_present == DCA_LFE_FLAG_128) {
2032 ✗ av_log(s->avctx, AV_LOG_ERROR, "Fixed point mode doesn't support LFF=1\n");
2033 ✗ return AVERROR(EINVAL);
2034 }
2035
2036 // Offset intermediate buffer for X96
2037
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 1347 if (x96_synth)
2038 84 samples += nsamples / 2;
2039
2040 // Interpolate LFE channel
2041 1347 s->dcadsp->lfe_fir_fixed(samples, s->lfe_samples + DCA_LFE_HISTORY,
2042 1347 ff_dca_lfe_fir_64_fixed, s->npcmblocks);
2043
2044
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 1347 if (x96_synth) {
2045 // Filter 96 kHz oversampled LFE PCM to attenuate high frequency
2046 // (47.6 - 48.0 kHz) components of interpolation image
2047 84 s->dcadsp->lfe_x96_fixed(s->output_samples[DCA_SPEAKER_LFE1],
2048 samples, &s->output_history_lfe_fixed,
2049 84 nsamples / 2);
2050
2051 }
2052
2053 // Update LFE history
2054
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 12123 for (n = DCA_LFE_HISTORY - 1; n >= 0; n--)
2055 10776 s->lfe_samples[n] = s->lfe_samples[nlfesamples + n];
2056 }
2057
2058 1864 return 0;
2059 }
2060
2061 519 static int filter_frame_fixed(DCACoreDecoder *s, AVFrame *frame)
2062 {
2063 519 AVCodecContext *avctx = s->avctx;
2064 519 DCAContext *dca = avctx->priv_data;
2065 int i, n, ch, ret, spkr, nsamples;
2066
2067 // Don't filter twice when falling back from XLL
2068
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 519 if (!(dca->packet & DCA_PACKET_XLL) && (ret = ff_dca_core_filter_fixed(s, 0)) < 0)
2069 ✗ return ret;
2070
2071 519 avctx->sample_rate = s->output_rate;
2072 519 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
2073 519 avctx->bits_per_raw_sample = 24;
2074
2075 519 frame->nb_samples = nsamples = s->npcmsamples;
2076
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 519 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
2077 ✗ return ret;
2078
2079 // Undo embedded XCH downmix
2080
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 519 if (s->es_format && (s->ext_audio_mask & DCA_CSS_XCH)
2081 ✗ && s->audio_mode >= DCA_AMODE_2F2R) {
2082 ✗ s->dcadsp->dmix_sub_xch(s->output_samples[DCA_SPEAKER_Ls],
2083 s->output_samples[DCA_SPEAKER_Rs],
2084 ✗ s->output_samples[DCA_SPEAKER_Cs],
2085 nsamples);
2086
2087 }
2088
2089 // Undo embedded XXCH downmix
2090
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 519 if ((s->ext_audio_mask & (DCA_CSS_XXCH | DCA_EXSS_XXCH))
2091 ✗ && s->xxch_dmix_embedded) {
2092 ✗ int scale_inv = s->xxch_dmix_scale_inv;
2093 ✗ int *coeff_ptr = s->xxch_dmix_coeff;
2094 ✗ int xch_base = ff_dca_channels[s->audio_mode];
2095 av_assert1(s->nchannels - xch_base <= DCA_XXCH_CHANNELS_MAX);
2096
2097 // Undo embedded core downmix pre-scaling
2098 ✗ for (spkr = 0; spkr < s->xxch_mask_nbits; spkr++) {
2099 ✗ if (s->xxch_core_mask & (1U << spkr)) {
2100 ✗ s->dcadsp->dmix_scale_inv(s->output_samples[spkr],
2101 scale_inv, nsamples);
2102 }
2103 }
2104
2105 // Undo downmix
2106 ✗ for (ch = xch_base; ch < s->nchannels; ch++) {
2107 ✗ int src_spkr = map_prm_ch_to_spkr(s, ch);
2108 ✗ if (src_spkr < 0)
2109 ✗ return AVERROR(EINVAL);
2110 ✗ for (spkr = 0; spkr < s->xxch_mask_nbits; spkr++) {
2111 ✗ if (s->xxch_dmix_mask[ch - xch_base] & (1U << spkr)) {
2112 ✗ int coeff = mul16(*coeff_ptr++, scale_inv);
2113 ✗ if (coeff) {
2114 ✗ s->dcadsp->dmix_sub(s->output_samples[spkr ],
2115 ✗ s->output_samples[src_spkr],
2116 coeff, nsamples);
2117 }
2118 }
2119 }
2120 }
2121 }
2122
2123
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 519 if (!(s->ext_audio_mask & (DCA_CSS_XXCH | DCA_CSS_XCH | DCA_EXSS_XXCH))) {
2124 // Front sum/difference decoding
2125
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 519 if ((s->sumdiff_front && s->audio_mode > DCA_AMODE_MONO)
2126
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 519 || s->audio_mode == DCA_AMODE_STEREO_SUMDIFF) {
2127 ✗ s->fixed_dsp->butterflies_fixed(s->output_samples[DCA_SPEAKER_L],
2128 ✗ s->output_samples[DCA_SPEAKER_R],
2129 nsamples);
2130 }
2131
2132 // Surround sum/difference decoding
2133
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 519 if (s->sumdiff_surround && s->audio_mode >= DCA_AMODE_2F2R) {
2134 ✗ s->fixed_dsp->butterflies_fixed(s->output_samples[DCA_SPEAKER_Ls],
2135 ✗ s->output_samples[DCA_SPEAKER_Rs],
2136 nsamples);
2137 }
2138 }
2139
2140 // Downmix primary channel set to stereo
2141
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 519 if (s->request_mask != s->ch_mask) {
2142 ✗ ff_dca_downmix_to_stereo_fixed(s->dcadsp,
2143 ✗ s->output_samples,
2144 ✗ s->prim_dmix_coeff,
2145 nsamples, s->ch_mask);
2146 }
2147
2148
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 1565 for (i = 0; i < avctx->ch_layout.nb_channels; i++) {
2149 1046 int32_t *samples = s->output_samples[s->ch_remap[i]];
2150 1046 int32_t *plane = (int32_t *)frame->extended_data[i];
2151
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 536598 for (n = 0; n < nsamples; n++)
2152 535552 plane[n] = clip23(samples[n]) * (1 << 8);
2153 }
2154
2155 519 return 0;
2156 }
2157
2158 608 static int filter_frame_float(DCACoreDecoder *s, AVFrame *frame)
2159 {
2160 608 AVCodecContext *avctx = s->avctx;
2161 608 int x96_nchannels = 0, x96_synth = 0;
2162 int i, n, ch, ret, spkr, nsamples, nchannels;
2163 608 float *output_samples[DCA_SPEAKER_COUNT] = { NULL }, *ptr;
2164 const float *filter_coeff;
2165
2166
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 608 if (s->ext_audio_mask & (DCA_CSS_X96 | DCA_EXSS_X96)) {
2167 35 x96_nchannels = s->x96_nchannels;
2168 35 x96_synth = 1;
2169 }
2170
2171 608 avctx->sample_rate = s->sample_rate << x96_synth;
2172 608 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
2173 608 avctx->bits_per_raw_sample = 0;
2174
2175 608 frame->nb_samples = nsamples = (s->npcmblocks * DCA_PCMBLOCK_SAMPLES) << x96_synth;
2176
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 608 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
2177 ✗ return ret;
2178
2179 // Build reverse speaker to channel mapping
2180
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 4538 for (i = 0; i < avctx->ch_layout.nb_channels; i++)
2181 3930 output_samples[s->ch_remap[i]] = (float *)frame->extended_data[i];
2182
2183 // Allocate space for extra channels
2184 608 nchannels = av_popcount(s->ch_mask) - avctx->ch_layout.nb_channels;
2185
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 608 if (nchannels > 0) {
2186 7 av_fast_malloc(&s->output_buffer, &s->output_size,
2187 7 nsamples * nchannels * sizeof(float));
2188
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 7 if (!s->output_buffer)
2189 ✗ return AVERROR(ENOMEM);
2190
2191 7 ptr = (float *)s->output_buffer;
2192
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 231 for (spkr = 0; spkr < DCA_SPEAKER_COUNT; spkr++) {
2193
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 224 if (!(s->ch_mask & (1U << spkr)))
2194 182 continue;
2195
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 42 if (output_samples[spkr])
2196 14 continue;
2197 28 output_samples[spkr] = ptr;
2198 28 ptr += nsamples;
2199 }
2200 }
2201
2202 // Handle change of filtering mode
2203 608 set_filter_mode(s, x96_synth);
2204
2205 // Select filter
2206
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 608 if (x96_synth)
2207 35 filter_coeff = ff_dca_fir_64bands;
2208
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 573 else if (s->filter_perfect)
2209 ✗ filter_coeff = ff_dca_fir_32bands_perfect;
2210 else
2211 573 filter_coeff = ff_dca_fir_32bands_nonperfect;
2212
2213 // Filter primary channels
2214
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 3959 for (ch = 0; ch < s->nchannels; ch++) {
2215 // Map this primary channel to speaker
2216 3351 spkr = map_prm_ch_to_spkr(s, ch);
2217
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 3351 if (spkr < 0)
2218 ✗ return AVERROR(EINVAL);
2219
2220 // Filter bank reconstruction
2221 3351 s->dcadsp->sub_qmf_float[x96_synth](
2222 &s->synth,
2223 s->imdct[x96_synth],
2224 s->imdct_fn[x96_synth],
2225 output_samples[spkr],
2226 3351 s->subband_samples[ch],
2227 ch < x96_nchannels ? s->x96_subband_samples[ch] : NULL,
2228 3351 s->dcadsp_data[ch].u.flt.hist1,
2229 &s->dcadsp_data[ch].offset,
2230 3351 s->dcadsp_data[ch].u.flt.hist2,
2231 filter_coeff,
2232 3351 s->npcmblocks,
2233
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 3351 1.0f / (1 << (17 - x96_synth)));
2234 }
2235
2236 // Filter LFE channel
2237
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 608 if (s->lfe_present) {
2238 607 int dec_select = (s->lfe_present == DCA_LFE_FLAG_128);
2239 607 float *samples = output_samples[DCA_SPEAKER_LFE1];
2240 607 int nlfesamples = s->npcmblocks >> (dec_select + 1);
2241
2242 // Offset intermediate buffer for X96
2243
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 607 if (x96_synth)
2244 35 samples += nsamples / 2;
2245
2246 // Select filter
2247
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 607 if (dec_select)
2248 ✗ filter_coeff = ff_dca_lfe_fir_128;
2249 else
2250 607 filter_coeff = ff_dca_lfe_fir_64;
2251
2252 // Interpolate LFE channel
2253 607 s->dcadsp->lfe_fir_float[dec_select](
2254 607 samples, s->lfe_samples + DCA_LFE_HISTORY,
2255 607 filter_coeff, s->npcmblocks);
2256
2257
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 607 if (x96_synth) {
2258 // Filter 96 kHz oversampled LFE PCM to attenuate high frequency
2259 // (47.6 - 48.0 kHz) components of interpolation image
2260 35 s->dcadsp->lfe_x96_float(output_samples[DCA_SPEAKER_LFE1],
2261 samples, &s->output_history_lfe_float,
2262 35 nsamples / 2);
2263 }
2264
2265 // Update LFE history
2266
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 5463 for (n = DCA_LFE_HISTORY - 1; n >= 0; n--)
2267 4856 s->lfe_samples[n] = s->lfe_samples[nlfesamples + n];
2268 }
2269
2270 // Undo embedded XCH downmix
2271
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 608 if (s->es_format && (s->ext_audio_mask & DCA_CSS_XCH)
2272
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 272 && s->audio_mode >= DCA_AMODE_2F2R) {
2273 272 s->float_dsp->vector_fmac_scalar(output_samples[DCA_SPEAKER_Ls],
2274 272 output_samples[DCA_SPEAKER_Cs],
2275 -M_SQRT1_2, nsamples);
2276 272 s->float_dsp->vector_fmac_scalar(output_samples[DCA_SPEAKER_Rs],
2277 272 output_samples[DCA_SPEAKER_Cs],
2278 -M_SQRT1_2, nsamples);
2279 }
2280
2281 // Undo embedded XXCH downmix
2282
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 608 if ((s->ext_audio_mask & (DCA_CSS_XXCH | DCA_EXSS_XXCH))
2283
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 21 && s->xxch_dmix_embedded) {
2284 21 float scale_inv = s->xxch_dmix_scale_inv * (1.0f / (1 << 16));
2285 21 int *coeff_ptr = s->xxch_dmix_coeff;
2286 21 int xch_base = ff_dca_channels[s->audio_mode];
2287 av_assert1(s->nchannels - xch_base <= DCA_XXCH_CHANNELS_MAX);
2288
2289 // Undo downmix
2290
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 63 for (ch = xch_base; ch < s->nchannels; ch++) {
2291 42 int src_spkr = map_prm_ch_to_spkr(s, ch);
2292
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 42 if (src_spkr < 0)
2293 ✗ return AVERROR(EINVAL);
2294
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 504 for (spkr = 0; spkr < s->xxch_mask_nbits; spkr++) {
2295
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 462 if (s->xxch_dmix_mask[ch - xch_base] & (1U << spkr)) {
2296 42 int coeff = *coeff_ptr++;
2297
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 42 if (coeff) {
2298 42 s->float_dsp->vector_fmac_scalar(output_samples[ spkr],
2299 42 output_samples[src_spkr],
2300 coeff * (-1.0f / (1 << 15)),
2301 nsamples);
2302 }
2303 }
2304 }
2305 }
2306
2307 // Undo embedded core downmix pre-scaling
2308
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 252 for (spkr = 0; spkr < s->xxch_mask_nbits; spkr++) {
2309
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 231 if (s->xxch_core_mask & (1U << spkr)) {
2310 126 s->float_dsp->vector_fmul_scalar(output_samples[spkr],
2311 126 output_samples[spkr],
2312 scale_inv, nsamples);
2313 }
2314 }
2315 }
2316
2317
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 608 if (!(s->ext_audio_mask & (DCA_CSS_XXCH | DCA_CSS_XCH | DCA_EXSS_XXCH))) {
2318 // Front sum/difference decoding
2319
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 315 if ((s->sumdiff_front && s->audio_mode > DCA_AMODE_MONO)
2320
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 315 || s->audio_mode == DCA_AMODE_STEREO_SUMDIFF) {
2321 ✗ s->float_dsp->butterflies_float(output_samples[DCA_SPEAKER_L],
2322 output_samples[DCA_SPEAKER_R],
2323 nsamples);
2324 }
2325
2326 // Surround sum/difference decoding
2327
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 315 if (s->sumdiff_surround && s->audio_mode >= DCA_AMODE_2F2R) {
2328 ✗ s->float_dsp->butterflies_float(output_samples[DCA_SPEAKER_Ls],
2329 output_samples[DCA_SPEAKER_Rs],
2330 nsamples);
2331 }
2332 }
2333
2334 // Downmix primary channel set to stereo
2335
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 608 if (s->request_mask != s->ch_mask) {
2336 7 ff_dca_downmix_to_stereo_float(s->float_dsp, output_samples,
2337 7 s->prim_dmix_coeff,
2338 nsamples, s->ch_mask);
2339 }
2340
2341 608 return 0;
2342 }
2343
2344 1127 int ff_dca_core_filter_frame(DCACoreDecoder *s, AVFrame *frame)
2345 {
2346 1127 AVCodecContext *avctx = s->avctx;
2347 1127 DCAContext *dca = avctx->priv_data;
2348 1127 DCAExssAsset *asset = &dca->exss.assets[0];
2349 enum AVMatrixEncoding matrix_encoding;
2350 int ret;
2351
2352 // Handle downmixing to stereo request
2353
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 1127 if (dca->request_channel_layout == DCA_SPEAKER_LAYOUT_STEREO
2354
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 14 && s->audio_mode > DCA_AMODE_MONO && s->prim_dmix_embedded
2355
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 7 && (s->prim_dmix_type == DCA_DMIX_TYPE_LoRo ||
2356 ✗ s->prim_dmix_type == DCA_DMIX_TYPE_LtRt))
2357 7 s->request_mask = DCA_SPEAKER_LAYOUT_STEREO;
2358 else
2359 1120 s->request_mask = s->ch_mask;
2360
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 1127 if (!ff_dca_set_channel_layout(avctx, s->ch_remap, s->request_mask))
2361 ✗ return AVERROR(EINVAL);
2362
2363 // Force fixed point mode when falling back from XLL
2364
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 1127 if ((avctx->flags & AV_CODEC_FLAG_BITEXACT) || ((dca->packet & DCA_PACKET_EXSS)
2365
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 56 && (asset->extension_mask & DCA_EXSS_XLL)))
2366 519 ret = filter_frame_fixed(s, frame);
2367 else
2368 608 ret = filter_frame_float(s, frame);
2369
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 1127 if (ret < 0)
2370 ✗ return ret;
2371
2372 // Set profile, bit rate, etc
2373
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 1127 if (s->ext_audio_mask & DCA_EXSS_MASK)
2374 56 avctx->profile = AV_PROFILE_DTS_HD_HRA;
2375
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 1071 else if (s->ext_audio_mask & (DCA_CSS_XXCH | DCA_CSS_XCH))
2376 258 avctx->profile = AV_PROFILE_DTS_ES;
2377
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 813 else if (s->ext_audio_mask & DCA_CSS_X96)
2378 7 avctx->profile = AV_PROFILE_DTS_96_24;
2379 else
2380 806 avctx->profile = AV_PROFILE_DTS;
2381
2382
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 1127 if (s->bit_rate > 3 && !(s->ext_audio_mask & DCA_EXSS_MASK))
2383 1071 avctx->bit_rate = s->bit_rate;
2384 else
2385 56 avctx->bit_rate = 0;
2386
2387
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 1127 if (s->audio_mode == DCA_AMODE_STEREO_TOTAL || (s->request_mask != s->ch_mask &&
2388
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 7 s->prim_dmix_type == DCA_DMIX_TYPE_LtRt))
2389 ✗ matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
2390 else
2391 1127 matrix_encoding = AV_MATRIX_ENCODING_NONE;
2392
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 1127 if ((ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
2393 ✗ return ret;
2394
2395 1127 return 0;
2396 }
2397
2398 ✗ av_cold void ff_dca_core_flush(DCACoreDecoder *s)
2399 {
2400 ✗ if (s->subband_buffer) {
2401 ✗ erase_adpcm_history(s);
2402 ✗ memset(s->lfe_samples, 0, DCA_LFE_HISTORY * sizeof(int32_t));
2403 }
2404
2405 ✗ if (s->x96_subband_buffer)
2406 ✗ erase_x96_adpcm_history(s);
2407
2408 ✗ erase_dsp_history(s);
2409 ✗ }
2410
2411 101 av_cold int ff_dca_core_init(DCACoreDecoder *s)
2412 {
2413 int ret;
2414 101 float scale = 1.0f;
2415
2416
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 101 if (!(s->float_dsp = avpriv_float_dsp_alloc(0)))
2417 ✗ return -1;
2418
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 101 if (!(s->fixed_dsp = avpriv_alloc_fixed_dsp(0)))
2419 ✗ return -1;
2420
2421 101 ff_dcadct_init(&s->dcadct);
2422
2423
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✓ Branch 2 taken 101 times.
 101 if ((ret = av_tx_init(&s->imdct[0], &s->imdct_fn[0], AV_TX_FLOAT_MDCT,
2424 1, 32, &scale, 0)) < 0)
2425 ✗ return ret;
2426
2427
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 101 if ((ret = av_tx_init(&s->imdct[1], &s->imdct_fn[1], AV_TX_FLOAT_MDCT,
2428 1, 64, &scale, 0)) < 0)
2429 ✗ return ret;
2430
2431 101 ff_synth_filter_init(&s->synth);
2432
2433 101 s->x96_rand = 1;
2434 101 return 0;
2435 }
2436
2437 101 av_cold void ff_dca_core_close(DCACoreDecoder *s)
2438 {
2439 101 av_freep(&s->float_dsp);
2440 101 av_freep(&s->fixed_dsp);
2441
2442 101 av_tx_uninit(&s->imdct[0]);
2443 101 av_tx_uninit(&s->imdct[1]);
2444
2445 101 av_freep(&s->subband_buffer);
2446 101 s->subband_size = 0;
2447
2448 101 av_freep(&s->x96_subband_buffer);
2449 101 s->x96_subband_size = 0;
2450
2451 101 av_freep(&s->output_buffer);
2452 101 s->output_size = 0;
2453 101 }
2454