2 * DCA compatible decoder
3 * Copyright (C) 2004 Gildas Bazin
4 * Copyright (C) 2004 Benjamin Zores
5 * Copyright (C) 2006 Benjamin Larsson
6 * Copyright (C) 2007 Konstantin Shishkov
7 * Copyright (C) 2012 Paul B Mahol
8 * Copyright (C) 2014 Niels Möller
10 * This file is part of FFmpeg.
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "libavutil/attributes.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/common.h"
34 #include "libavutil/float_dsp.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/intreadwrite.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/samplefmt.h"
43 #include "dca_syncwords.h"
48 #include "fmtconvert.h"
52 #include "synth_filter.h"
73 enum DCAXxchSpeakerMask {
74 DCA_XXCH_FRONT_CENTER = 0x0000001,
75 DCA_XXCH_FRONT_LEFT = 0x0000002,
76 DCA_XXCH_FRONT_RIGHT = 0x0000004,
77 DCA_XXCH_SIDE_REAR_LEFT = 0x0000008,
78 DCA_XXCH_SIDE_REAR_RIGHT = 0x0000010,
79 DCA_XXCH_LFE1 = 0x0000020,
80 DCA_XXCH_REAR_CENTER = 0x0000040,
81 DCA_XXCH_SURROUND_REAR_LEFT = 0x0000080,
82 DCA_XXCH_SURROUND_REAR_RIGHT = 0x0000100,
83 DCA_XXCH_SIDE_SURROUND_LEFT = 0x0000200,
84 DCA_XXCH_SIDE_SURROUND_RIGHT = 0x0000400,
85 DCA_XXCH_FRONT_CENTER_LEFT = 0x0000800,
86 DCA_XXCH_FRONT_CENTER_RIGHT = 0x0001000,
87 DCA_XXCH_FRONT_HIGH_LEFT = 0x0002000,
88 DCA_XXCH_FRONT_HIGH_CENTER = 0x0004000,
89 DCA_XXCH_FRONT_HIGH_RIGHT = 0x0008000,
90 DCA_XXCH_LFE2 = 0x0010000,
91 DCA_XXCH_SIDE_FRONT_LEFT = 0x0020000,
92 DCA_XXCH_SIDE_FRONT_RIGHT = 0x0040000,
93 DCA_XXCH_OVERHEAD = 0x0080000,
94 DCA_XXCH_SIDE_HIGH_LEFT = 0x0100000,
95 DCA_XXCH_SIDE_HIGH_RIGHT = 0x0200000,
96 DCA_XXCH_REAR_HIGH_CENTER = 0x0400000,
97 DCA_XXCH_REAR_HIGH_LEFT = 0x0800000,
98 DCA_XXCH_REAR_HIGH_RIGHT = 0x1000000,
99 DCA_XXCH_REAR_LOW_CENTER = 0x2000000,
100 DCA_XXCH_REAR_LOW_LEFT = 0x4000000,
101 DCA_XXCH_REAR_LOW_RIGHT = 0x8000000,
104 #define DCA_DOLBY 101 /* FIXME */
106 #define DCA_CHANNEL_BITS 6
107 #define DCA_CHANNEL_MASK 0x3F
111 #define HEADER_SIZE 14
113 #define DCA_NSYNCAUX 0x9A1105A0
115 #define SAMPLES_PER_SUBBAND 8 // number of samples per subband per subsubframe
117 /** Bit allocation */
118 typedef struct BitAlloc {
119 int offset; ///< code values offset
120 int maxbits[8]; ///< max bits in VLC
121 int wrap; ///< wrap for get_vlc2()
122 VLC vlc[8]; ///< actual codes
125 static BitAlloc dca_bitalloc_index; ///< indexes for samples VLC select
126 static BitAlloc dca_tmode; ///< transition mode VLCs
127 static BitAlloc dca_scalefactor; ///< scalefactor VLCs
128 static BitAlloc dca_smpl_bitalloc[11]; ///< samples VLCs
130 static av_always_inline int get_bitalloc(GetBitContext *gb, BitAlloc *ba,
133 return get_vlc2(gb, ba->vlc[idx].table, ba->vlc[idx].bits, ba->wrap) +
137 static float dca_dmix_code(unsigned code);
139 static av_cold void dca_init_vlcs(void)
141 static int vlcs_initialized = 0;
143 static VLC_TYPE dca_table[23622][2];
145 if (vlcs_initialized)
148 dca_bitalloc_index.offset = 1;
149 dca_bitalloc_index.wrap = 2;
150 for (i = 0; i < 5; i++) {
151 dca_bitalloc_index.vlc[i].table = &dca_table[ff_dca_vlc_offs[i]];
152 dca_bitalloc_index.vlc[i].table_allocated = ff_dca_vlc_offs[i + 1] - ff_dca_vlc_offs[i];
153 init_vlc(&dca_bitalloc_index.vlc[i], bitalloc_12_vlc_bits[i], 12,
154 bitalloc_12_bits[i], 1, 1,
155 bitalloc_12_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
157 dca_scalefactor.offset = -64;
158 dca_scalefactor.wrap = 2;
159 for (i = 0; i < 5; i++) {
160 dca_scalefactor.vlc[i].table = &dca_table[ff_dca_vlc_offs[i + 5]];
161 dca_scalefactor.vlc[i].table_allocated = ff_dca_vlc_offs[i + 6] - ff_dca_vlc_offs[i + 5];
162 init_vlc(&dca_scalefactor.vlc[i], SCALES_VLC_BITS, 129,
163 scales_bits[i], 1, 1,
164 scales_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
166 dca_tmode.offset = 0;
168 for (i = 0; i < 4; i++) {
169 dca_tmode.vlc[i].table = &dca_table[ff_dca_vlc_offs[i + 10]];
170 dca_tmode.vlc[i].table_allocated = ff_dca_vlc_offs[i + 11] - ff_dca_vlc_offs[i + 10];
171 init_vlc(&dca_tmode.vlc[i], tmode_vlc_bits[i], 4,
173 tmode_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
176 for (i = 0; i < 10; i++)
177 for (j = 0; j < 7; j++) {
178 if (!bitalloc_codes[i][j])
180 dca_smpl_bitalloc[i + 1].offset = bitalloc_offsets[i];
181 dca_smpl_bitalloc[i + 1].wrap = 1 + (j > 4);
182 dca_smpl_bitalloc[i + 1].vlc[j].table = &dca_table[ff_dca_vlc_offs[c]];
183 dca_smpl_bitalloc[i + 1].vlc[j].table_allocated = ff_dca_vlc_offs[c + 1] - ff_dca_vlc_offs[c];
185 init_vlc(&dca_smpl_bitalloc[i + 1].vlc[j], bitalloc_maxbits[i][j],
187 bitalloc_bits[i][j], 1, 1,
188 bitalloc_codes[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
191 vlcs_initialized = 1;
194 static inline void get_array(GetBitContext *gb, int *dst, int len, int bits)
197 *dst++ = get_bits(gb, bits);
200 static inline int dca_xxch2index(DCAContext *s, int xxch_ch)
204 /* locate channel set containing the channel */
205 for (i = -1, base = 0, mask = (s->xxch_core_spkmask & ~DCA_XXCH_LFE1);
206 i <= s->xxch_chset && !(mask & xxch_ch); mask = s->xxch_spk_masks[++i])
207 base += av_popcount(mask);
209 return base + av_popcount(mask & (xxch_ch - 1));
212 static int dca_parse_audio_coding_header(DCAContext *s, int base_channel,
216 static const float adj_table[4] = { 1.0, 1.1250, 1.2500, 1.4375 };
217 static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 };
218 static const int thr[11] = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 };
219 int hdr_pos = 0, hdr_size = 0;
221 int this_chans, acc_mask;
222 int embedded_downmix;
226 /* xxch has arbitrary sized audio coding headers */
228 hdr_pos = get_bits_count(&s->gb);
229 hdr_size = get_bits(&s->gb, 7) + 1;
232 nchans = get_bits(&s->gb, 3) + 1;
233 if (xxch && nchans >= 3) {
234 av_log(s->avctx, AV_LOG_ERROR, "nchans %d is too large\n", nchans);
235 return AVERROR_INVALIDDATA;
236 } else if (nchans + base_channel > DCA_PRIM_CHANNELS_MAX) {
237 av_log(s->avctx, AV_LOG_ERROR, "channel sum %d + %d is too large\n", nchans, base_channel);
238 return AVERROR_INVALIDDATA;
241 s->total_channels = nchans + base_channel;
242 s->prim_channels = s->total_channels;
244 /* obtain speaker layout mask & downmix coefficients for XXCH */
246 acc_mask = s->xxch_core_spkmask;
248 this_chans = get_bits(&s->gb, s->xxch_nbits_spk_mask - 6) << 6;
249 s->xxch_spk_masks[s->xxch_chset] = this_chans;
250 s->xxch_chset_nch[s->xxch_chset] = nchans;
252 for (i = 0; i <= s->xxch_chset; i++)
253 acc_mask |= s->xxch_spk_masks[i];
255 /* check for downmixing information */
256 if (get_bits1(&s->gb)) {
257 embedded_downmix = get_bits1(&s->gb);
258 coeff = get_bits(&s->gb, 6);
260 if (coeff<1 || coeff>61) {
261 av_log(s->avctx, AV_LOG_ERROR, "6bit coeff %d is out of range\n", coeff);
262 return AVERROR_INVALIDDATA;
265 scale_factor = -1.0f / dca_dmix_code((coeff<<2)-3);
267 s->xxch_dmix_sf[s->xxch_chset] = scale_factor;
269 for (i = base_channel; i < s->prim_channels; i++) {
270 mask[i] = get_bits(&s->gb, s->xxch_nbits_spk_mask);
273 for (j = base_channel; j < s->prim_channels; j++) {
274 memset(s->xxch_dmix_coeff[j], 0, sizeof(s->xxch_dmix_coeff[0]));
275 s->xxch_dmix_embedded |= (embedded_downmix << j);
276 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {
277 if (mask[j] & (1 << i)) {
278 if ((1 << i) == DCA_XXCH_LFE1) {
279 av_log(s->avctx, AV_LOG_WARNING,
280 "DCA-XXCH: dmix to LFE1 not supported.\n");
284 coeff = get_bits(&s->gb, 7);
285 ichan = dca_xxch2index(s, 1 << i);
286 if ((coeff&63)<1 || (coeff&63)>61) {
287 av_log(s->avctx, AV_LOG_ERROR, "7bit coeff %d is out of range\n", coeff);
288 return AVERROR_INVALIDDATA;
290 s->xxch_dmix_coeff[j][ichan] = dca_dmix_code((coeff<<2)-3);
297 if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)
298 s->prim_channels = DCA_PRIM_CHANNELS_MAX;
300 for (i = base_channel; i < s->prim_channels; i++) {
301 s->subband_activity[i] = get_bits(&s->gb, 5) + 2;
302 if (s->subband_activity[i] > DCA_SUBBANDS)
303 s->subband_activity[i] = DCA_SUBBANDS;
305 for (i = base_channel; i < s->prim_channels; i++) {
306 s->vq_start_subband[i] = get_bits(&s->gb, 5) + 1;
307 if (s->vq_start_subband[i] > DCA_SUBBANDS)
308 s->vq_start_subband[i] = DCA_SUBBANDS;
310 get_array(&s->gb, s->joint_intensity + base_channel, s->prim_channels - base_channel, 3);
311 get_array(&s->gb, s->transient_huffman + base_channel, s->prim_channels - base_channel, 2);
312 get_array(&s->gb, s->scalefactor_huffman + base_channel, s->prim_channels - base_channel, 3);
313 get_array(&s->gb, s->bitalloc_huffman + base_channel, s->prim_channels - base_channel, 3);
315 /* Get codebooks quantization indexes */
317 memset(s->quant_index_huffman, 0, sizeof(s->quant_index_huffman));
318 for (j = 1; j < 11; j++)
319 for (i = base_channel; i < s->prim_channels; i++)
320 s->quant_index_huffman[i][j] = get_bits(&s->gb, bitlen[j]);
322 /* Get scale factor adjustment */
323 for (j = 0; j < 11; j++)
324 for (i = base_channel; i < s->prim_channels; i++)
325 s->scalefactor_adj[i][j] = 1;
327 for (j = 1; j < 11; j++)
328 for (i = base_channel; i < s->prim_channels; i++)
329 if (s->quant_index_huffman[i][j] < thr[j])
330 s->scalefactor_adj[i][j] = adj_table[get_bits(&s->gb, 2)];
333 if (s->crc_present) {
334 /* Audio header CRC check */
335 get_bits(&s->gb, 16);
338 /* Skip to the end of the header, also ignore CRC if present */
339 i = get_bits_count(&s->gb);
340 if (hdr_pos + 8 * hdr_size > i)
341 skip_bits_long(&s->gb, hdr_pos + 8 * hdr_size - i);
344 s->current_subframe = 0;
345 s->current_subsubframe = 0;
350 static int dca_parse_frame_header(DCAContext *s)
352 init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);
355 skip_bits_long(&s->gb, 32);
358 s->frame_type = get_bits(&s->gb, 1);
359 s->samples_deficit = get_bits(&s->gb, 5) + 1;
360 s->crc_present = get_bits(&s->gb, 1);
361 s->sample_blocks = get_bits(&s->gb, 7) + 1;
362 s->frame_size = get_bits(&s->gb, 14) + 1;
363 if (s->frame_size < 95)
364 return AVERROR_INVALIDDATA;
365 s->amode = get_bits(&s->gb, 6);
366 s->sample_rate = avpriv_dca_sample_rates[get_bits(&s->gb, 4)];
368 return AVERROR_INVALIDDATA;
369 s->bit_rate_index = get_bits(&s->gb, 5);
370 s->bit_rate = ff_dca_bit_rates[s->bit_rate_index];
372 return AVERROR_INVALIDDATA;
374 skip_bits1(&s->gb); // always 0 (reserved, cf. ETSI TS 102 114 V1.4.1)
375 s->dynrange = get_bits(&s->gb, 1);
376 s->timestamp = get_bits(&s->gb, 1);
377 s->aux_data = get_bits(&s->gb, 1);
378 s->hdcd = get_bits(&s->gb, 1);
379 s->ext_descr = get_bits(&s->gb, 3);
380 s->ext_coding = get_bits(&s->gb, 1);
381 s->aspf = get_bits(&s->gb, 1);
382 s->lfe = get_bits(&s->gb, 2);
383 s->predictor_history = get_bits(&s->gb, 1);
387 av_log(s->avctx, AV_LOG_ERROR, "Invalid LFE value: %d\n", s->lfe);
388 return AVERROR_INVALIDDATA;
391 /* TODO: check CRC */
393 s->header_crc = get_bits(&s->gb, 16);
395 s->multirate_inter = get_bits(&s->gb, 1);
396 s->version = get_bits(&s->gb, 4);
397 s->copy_history = get_bits(&s->gb, 2);
398 s->source_pcm_res = get_bits(&s->gb, 3);
399 s->front_sum = get_bits(&s->gb, 1);
400 s->surround_sum = get_bits(&s->gb, 1);
401 s->dialog_norm = get_bits(&s->gb, 4);
403 /* FIXME: channels mixing levels */
404 s->output = s->amode;
406 s->output |= DCA_LFE;
408 /* Primary audio coding header */
409 s->subframes = get_bits(&s->gb, 4) + 1;
411 return dca_parse_audio_coding_header(s, 0, 0);
414 static inline int get_scale(GetBitContext *gb, int level, int value, int log2range)
417 /* huffman encoded */
418 value += get_bitalloc(gb, &dca_scalefactor, level);
419 value = av_clip(value, 0, (1 << log2range) - 1);
420 } else if (level < 8) {
421 if (level + 1 > log2range) {
422 skip_bits(gb, level + 1 - log2range);
423 value = get_bits(gb, log2range);
425 value = get_bits(gb, level + 1);
431 static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
433 /* Primary audio coding side information */
436 if (get_bits_left(&s->gb) < 0)
437 return AVERROR_INVALIDDATA;
440 s->subsubframes[s->current_subframe] = get_bits(&s->gb, 2) + 1;
441 if (block_index + s->subsubframes[s->current_subframe] > (s->sample_blocks / SAMPLES_PER_SUBBAND)) {
442 s->subsubframes[s->current_subframe] = 1;
443 return AVERROR_INVALIDDATA;
445 s->partial_samples[s->current_subframe] = get_bits(&s->gb, 3);
448 for (j = base_channel; j < s->prim_channels; j++) {
449 for (k = 0; k < s->subband_activity[j]; k++)
450 s->prediction_mode[j][k] = get_bits(&s->gb, 1);
453 /* Get prediction codebook */
454 for (j = base_channel; j < s->prim_channels; j++) {
455 for (k = 0; k < s->subband_activity[j]; k++) {
456 if (s->prediction_mode[j][k] > 0) {
457 /* (Prediction coefficient VQ address) */
458 s->prediction_vq[j][k] = get_bits(&s->gb, 12);
463 /* Bit allocation index */
464 for (j = base_channel; j < s->prim_channels; j++) {
465 for (k = 0; k < s->vq_start_subband[j]; k++) {
466 if (s->bitalloc_huffman[j] == 6)
467 s->bitalloc[j][k] = get_bits(&s->gb, 5);
468 else if (s->bitalloc_huffman[j] == 5)
469 s->bitalloc[j][k] = get_bits(&s->gb, 4);
470 else if (s->bitalloc_huffman[j] == 7) {
471 av_log(s->avctx, AV_LOG_ERROR,
472 "Invalid bit allocation index\n");
473 return AVERROR_INVALIDDATA;
476 get_bitalloc(&s->gb, &dca_bitalloc_index, s->bitalloc_huffman[j]);
479 if (s->bitalloc[j][k] > 26) {
480 ff_dlog(s->avctx, "bitalloc index [%i][%i] too big (%i)\n",
481 j, k, s->bitalloc[j][k]);
482 return AVERROR_INVALIDDATA;
487 /* Transition mode */
488 for (j = base_channel; j < s->prim_channels; j++) {
489 for (k = 0; k < s->subband_activity[j]; k++) {
490 s->transition_mode[j][k] = 0;
491 if (s->subsubframes[s->current_subframe] > 1 &&
492 k < s->vq_start_subband[j] && s->bitalloc[j][k] > 0) {
493 s->transition_mode[j][k] =
494 get_bitalloc(&s->gb, &dca_tmode, s->transient_huffman[j]);
499 if (get_bits_left(&s->gb) < 0)
500 return AVERROR_INVALIDDATA;
502 for (j = base_channel; j < s->prim_channels; j++) {
503 const uint32_t *scale_table;
504 int scale_sum, log_size;
506 memset(s->scale_factor[j], 0,
507 s->subband_activity[j] * sizeof(s->scale_factor[0][0][0]) * 2);
509 if (s->scalefactor_huffman[j] == 6) {
510 scale_table = ff_dca_scale_factor_quant7;
513 scale_table = ff_dca_scale_factor_quant6;
517 /* When huffman coded, only the difference is encoded */
520 for (k = 0; k < s->subband_activity[j]; k++) {
521 if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0) {
522 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);
523 s->scale_factor[j][k][0] = scale_table[scale_sum];
526 if (k < s->vq_start_subband[j] && s->transition_mode[j][k]) {
527 /* Get second scale factor */
528 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);
529 s->scale_factor[j][k][1] = scale_table[scale_sum];
534 /* Joint subband scale factor codebook select */
535 for (j = base_channel; j < s->prim_channels; j++) {
536 /* Transmitted only if joint subband coding enabled */
537 if (s->joint_intensity[j] > 0)
538 s->joint_huff[j] = get_bits(&s->gb, 3);
541 if (get_bits_left(&s->gb) < 0)
542 return AVERROR_INVALIDDATA;
544 /* Scale factors for joint subband coding */
545 for (j = base_channel; j < s->prim_channels; j++) {
548 /* Transmitted only if joint subband coding enabled */
549 if (s->joint_intensity[j] > 0) {
551 source_channel = s->joint_intensity[j] - 1;
553 /* When huffman coded, only the difference is encoded
554 * (is this valid as well for joint scales ???) */
556 for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++) {
557 scale = get_scale(&s->gb, s->joint_huff[j], 64 /* bias */, 7);
558 s->joint_scale_factor[j][k] = scale; /*joint_scale_table[scale]; */
561 if (!(s->debug_flag & 0x02)) {
562 av_log(s->avctx, AV_LOG_DEBUG,
563 "Joint stereo coding not supported\n");
564 s->debug_flag |= 0x02;
569 /* Dynamic range coefficient */
570 if (!base_channel && s->dynrange)
571 s->dynrange_coef = get_bits(&s->gb, 8);
573 /* Side information CRC check word */
574 if (s->crc_present) {
575 get_bits(&s->gb, 16);
579 * Primary audio data arrays
582 /* VQ encoded high frequency subbands */
583 for (j = base_channel; j < s->prim_channels; j++)
584 for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)
585 /* 1 vector -> 32 samples */
586 s->high_freq_vq[j][k] = get_bits(&s->gb, 10);
588 /* Low frequency effect data */
589 if (!base_channel && s->lfe) {
592 int lfe_samples = 2 * s->lfe * (4 + block_index);
593 int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);
596 for (j = lfe_samples; j < lfe_end_sample; j++) {
597 /* Signed 8 bits int */
598 s->lfe_data[j] = get_sbits(&s->gb, 8);
601 /* Scale factor index */
602 quant7 = get_bits(&s->gb, 8);
604 avpriv_request_sample(s->avctx, "LFEScaleIndex larger than 127");
605 return AVERROR_INVALIDDATA;
607 s->lfe_scale_factor = ff_dca_scale_factor_quant7[quant7];
609 /* Quantization step size * scale factor */
610 lfe_scale = 0.035 * s->lfe_scale_factor;
612 for (j = lfe_samples; j < lfe_end_sample; j++)
613 s->lfe_data[j] *= lfe_scale;
619 static void qmf_32_subbands(DCAContext *s, int chans,
620 float samples_in[32][SAMPLES_PER_SUBBAND], float *samples_out,
623 const float *prCoeff;
625 int sb_act = s->subband_activity[chans];
627 scale *= sqrt(1 / 8.0);
630 if (!s->multirate_inter) /* Non-perfect reconstruction */
631 prCoeff = ff_dca_fir_32bands_nonperfect;
632 else /* Perfect reconstruction */
633 prCoeff = ff_dca_fir_32bands_perfect;
635 s->dcadsp.qmf_32_subbands(samples_in, sb_act, &s->synth, &s->imdct,
636 s->subband_fir_hist[chans],
637 &s->hist_index[chans],
638 s->subband_fir_noidea[chans], prCoeff,
639 samples_out, s->raXin, scale);
642 static QMF64_table *qmf64_precompute(void)
645 QMF64_table *table = av_malloc(sizeof(*table));
649 for (i = 0; i < 32; i++)
650 for (j = 0; j < 32; j++)
651 table->dct4_coeff[i][j] = cos((2 * i + 1) * (2 * j + 1) * M_PI / 128);
652 for (i = 0; i < 32; i++)
653 for (j = 0; j < 32; j++)
654 table->dct2_coeff[i][j] = cos((2 * i + 1) * j * M_PI / 64);
656 /* FIXME: Is the factor 0.125 = 1/8 right? */
657 for (i = 0; i < 32; i++)
658 table->rcos[i] = 0.125 / cos((2 * i + 1) * M_PI / 256);
659 for (i = 0; i < 32; i++)
660 table->rsin[i] = -0.125 / sin((2 * i + 1) * M_PI / 256);
665 /* FIXME: Totally unoptimized. Based on the reference code and
666 * http://multimedia.cx/mirror/dca-transform.pdf, with guessed tweaks
667 * for doubling the size. */
668 static void qmf_64_subbands(DCAContext *s, int chans, float samples_in[64][SAMPLES_PER_SUBBAND],
669 float *samples_out, float scale)
673 float *raX = s->subband_fir_hist[chans];
674 float *raZ = s->subband_fir_noidea[chans];
675 unsigned i, j, k, subindex;
677 for (i = s->subband_activity[chans]; i < 64; i++)
679 for (subindex = 0; subindex < SAMPLES_PER_SUBBAND; subindex++) {
680 for (i = 0; i < s->subband_activity[chans]; i++)
681 raXin[i] = samples_in[i][subindex];
683 for (k = 0; k < 32; k++) {
685 for (i = 0; i < 32; i++)
686 A[k] += (raXin[2 * i] + raXin[2 * i + 1]) * s->qmf64_table->dct4_coeff[k][i];
688 for (k = 0; k < 32; k++) {
689 B[k] = raXin[0] * s->qmf64_table->dct2_coeff[k][0];
690 for (i = 1; i < 32; i++)
691 B[k] += (raXin[2 * i] + raXin[2 * i - 1]) * s->qmf64_table->dct2_coeff[k][i];
693 for (k = 0; k < 32; k++) {
694 raX[k] = s->qmf64_table->rcos[k] * (A[k] + B[k]);
695 raX[63 - k] = s->qmf64_table->rsin[k] * (A[k] - B[k]);
698 for (i = 0; i < 64; i++) {
700 for (j = 0; j < 1024; j += 128)
701 out += ff_dca_fir_64bands[j + i] * (raX[j + i] - raX[j + 63 - i]);
702 *samples_out++ = out * scale;
705 for (i = 0; i < 64; i++) {
707 for (j = 0; j < 1024; j += 128)
708 hist += ff_dca_fir_64bands[64 + j + i] * (-raX[i + j] - raX[j + 63 - i]);
713 /* FIXME: Make buffer circular, to avoid this move. */
714 memmove(raX + 64, raX, (1024 - 64) * sizeof(*raX));
718 static void lfe_interpolation_fir(DCAContext *s, const float *samples_in,
721 /* samples_in: An array holding decimated samples.
722 * Samples in current subframe starts from samples_in[0],
723 * while samples_in[-1], samples_in[-2], ..., stores samples
724 * from last subframe as history.
726 * samples_out: An array holding interpolated samples
730 const float *prCoeff;
733 /* Select decimation filter */
736 prCoeff = ff_dca_lfe_fir_128;
739 if (s->exss_ext_mask & DCA_EXT_EXSS_XLL)
740 prCoeff = ff_dca_lfe_xll_fir_64;
742 prCoeff = ff_dca_lfe_fir_64;
745 for (deciindex = 0; deciindex < 2 * s->lfe; deciindex++) {
746 s->dcadsp.lfe_fir[idx](samples_out, samples_in, prCoeff);
748 samples_out += 2 * 32 * (1 + idx);
752 /* downmixing routines */
753 #define MIX_REAR1(samples, s1, rs, coef) \
754 samples[0][i] += samples[s1][i] * coef[rs][0]; \
755 samples[1][i] += samples[s1][i] * coef[rs][1];
757 #define MIX_REAR2(samples, s1, s2, rs, coef) \
758 samples[0][i] += samples[s1][i] * coef[rs][0] + samples[s2][i] * coef[rs + 1][0]; \
759 samples[1][i] += samples[s1][i] * coef[rs][1] + samples[s2][i] * coef[rs + 1][1];
761 #define MIX_FRONT3(samples, coef) \
765 samples[0][i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0]; \
766 samples[1][i] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];
768 #define DOWNMIX_TO_STEREO(op1, op2) \
769 for (i = 0; i < 256; i++) { \
774 static void dca_downmix(float **samples, int srcfmt, int lfe_present,
775 float coef[DCA_PRIM_CHANNELS_MAX + 1][2],
776 const int8_t *channel_mapping)
778 int c, l, r, sl, sr, s;
785 av_log(NULL, AV_LOG_ERROR, "Not implemented!\n");
789 case DCA_STEREO_TOTAL:
790 case DCA_STEREO_SUMDIFF:
793 c = channel_mapping[0];
794 l = channel_mapping[1];
795 r = channel_mapping[2];
796 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );
799 s = channel_mapping[2];
800 DOWNMIX_TO_STEREO(MIX_REAR1(samples, s, 2, coef), );
803 c = channel_mapping[0];
804 l = channel_mapping[1];
805 r = channel_mapping[2];
806 s = channel_mapping[3];
807 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
808 MIX_REAR1(samples, s, 3, coef));
811 sl = channel_mapping[2];
812 sr = channel_mapping[3];
813 DOWNMIX_TO_STEREO(MIX_REAR2(samples, sl, sr, 2, coef), );
816 c = channel_mapping[0];
817 l = channel_mapping[1];
818 r = channel_mapping[2];
819 sl = channel_mapping[3];
820 sr = channel_mapping[4];
821 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
822 MIX_REAR2(samples, sl, sr, 3, coef));
826 int lf_buf = ff_dca_lfe_index[srcfmt];
827 int lf_idx = ff_dca_channels[srcfmt];
828 for (i = 0; i < 256; i++) {
829 samples[0][i] += samples[lf_buf][i] * coef[lf_idx][0];
830 samples[1][i] += samples[lf_buf][i] * coef[lf_idx][1];
835 #ifndef decode_blockcodes
836 /* Very compact version of the block code decoder that does not use table
837 * look-up but is slightly slower */
838 static int decode_blockcode(int code, int levels, int32_t *values)
841 int offset = (levels - 1) >> 1;
843 for (i = 0; i < 4; i++) {
844 int div = FASTDIV(code, levels);
845 values[i] = code - offset - div * levels;
852 static int decode_blockcodes(int code1, int code2, int levels, int32_t *values)
854 return decode_blockcode(code1, levels, values) |
855 decode_blockcode(code2, levels, values + 4);
859 static const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 };
860 static const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 };
862 static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)
865 int subsubframe = s->current_subsubframe;
867 const float *quant_step_table;
870 float (*subband_samples)[DCA_SUBBANDS][SAMPLES_PER_SUBBAND] = s->subband_samples[block_index];
871 LOCAL_ALIGNED_16(int32_t, block, [SAMPLES_PER_SUBBAND * DCA_SUBBANDS]);
877 /* Select quantization step size table */
878 if (s->bit_rate_index == 0x1f)
879 quant_step_table = ff_dca_lossless_quant_d;
881 quant_step_table = ff_dca_lossy_quant_d;
883 for (k = base_channel; k < s->prim_channels; k++) {
884 float rscale[DCA_SUBBANDS];
886 if (get_bits_left(&s->gb) < 0)
887 return AVERROR_INVALIDDATA;
889 for (l = 0; l < s->vq_start_subband[k]; l++) {
892 /* Select the mid-tread linear quantizer */
893 int abits = s->bitalloc[k][l];
895 float quant_step_size = quant_step_table[abits];
898 * Determine quantization index code book and its type
901 /* Select quantization index code book */
902 int sel = s->quant_index_huffman[k][abits];
905 * Extract bits from the bit stream
909 memset(block + SAMPLES_PER_SUBBAND * l, 0, SAMPLES_PER_SUBBAND * sizeof(block[0]));
911 /* Deal with transients */
912 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];
913 rscale[l] = quant_step_size * s->scale_factor[k][l][sfi] *
914 s->scalefactor_adj[k][sel];
916 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {
919 int block_code1, block_code2, size, levels, err;
921 size = abits_sizes[abits - 1];
922 levels = abits_levels[abits - 1];
924 block_code1 = get_bits(&s->gb, size);
925 block_code2 = get_bits(&s->gb, size);
926 err = decode_blockcodes(block_code1, block_code2,
927 levels, block + SAMPLES_PER_SUBBAND * l);
929 av_log(s->avctx, AV_LOG_ERROR,
930 "ERROR: block code look-up failed\n");
931 return AVERROR_INVALIDDATA;
935 for (m = 0; m < SAMPLES_PER_SUBBAND; m++)
936 block[SAMPLES_PER_SUBBAND * l + m] = get_sbits(&s->gb, abits - 3);
940 for (m = 0; m < SAMPLES_PER_SUBBAND; m++)
941 block[SAMPLES_PER_SUBBAND * l + m] = get_bitalloc(&s->gb,
942 &dca_smpl_bitalloc[abits], sel);
947 s->fmt_conv.int32_to_float_fmul_array8(&s->fmt_conv, subband_samples[k][0],
948 block, rscale, SAMPLES_PER_SUBBAND * s->vq_start_subband[k]);
950 for (l = 0; l < s->vq_start_subband[k]; l++) {
953 * Inverse ADPCM if in prediction mode
955 if (s->prediction_mode[k][l]) {
957 if (s->predictor_history)
958 subband_samples[k][l][0] += (ff_dca_adpcm_vb[s->prediction_vq[k][l]][0] *
959 s->subband_samples_hist[k][l][3] +
960 ff_dca_adpcm_vb[s->prediction_vq[k][l]][1] *
961 s->subband_samples_hist[k][l][2] +
962 ff_dca_adpcm_vb[s->prediction_vq[k][l]][2] *
963 s->subband_samples_hist[k][l][1] +
964 ff_dca_adpcm_vb[s->prediction_vq[k][l]][3] *
965 s->subband_samples_hist[k][l][0]) *
967 for (m = 1; m < SAMPLES_PER_SUBBAND; m++) {
968 float sum = ff_dca_adpcm_vb[s->prediction_vq[k][l]][0] *
969 subband_samples[k][l][m - 1];
970 for (n = 2; n <= 4; n++)
972 sum += ff_dca_adpcm_vb[s->prediction_vq[k][l]][n - 1] *
973 subband_samples[k][l][m - n];
974 else if (s->predictor_history)
975 sum += ff_dca_adpcm_vb[s->prediction_vq[k][l]][n - 1] *
976 s->subband_samples_hist[k][l][m - n + 4];
977 subband_samples[k][l][m] += sum * (1.0f / 8192);
983 * Decode VQ encoded high frequencies
985 if (s->subband_activity[k] > s->vq_start_subband[k]) {
986 if (!(s->debug_flag & 0x01)) {
987 av_log(s->avctx, AV_LOG_DEBUG,
988 "Stream with high frequencies VQ coding\n");
989 s->debug_flag |= 0x01;
991 s->dcadsp.decode_hf(subband_samples[k], s->high_freq_vq[k],
992 ff_dca_high_freq_vq, subsubframe * SAMPLES_PER_SUBBAND,
993 s->scale_factor[k], s->vq_start_subband[k],
994 s->subband_activity[k]);
998 /* Check for DSYNC after subsubframe */
999 if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {
1000 if (get_bits(&s->gb, 16) != 0xFFFF) {
1001 av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");
1002 return AVERROR_INVALIDDATA;
1006 /* Backup predictor history for adpcm */
1007 for (k = base_channel; k < s->prim_channels; k++)
1008 for (l = 0; l < s->vq_start_subband[k]; l++)
1009 AV_COPY128(s->subband_samples_hist[k][l], &subband_samples[k][l][4]);
1014 static int dca_filter_channels(DCAContext *s, int block_index, int upsample)
1016 float (*subband_samples)[DCA_SUBBANDS][SAMPLES_PER_SUBBAND] = s->subband_samples[block_index];
1020 if (!s->qmf64_table) {
1021 s->qmf64_table = qmf64_precompute();
1022 if (!s->qmf64_table)
1023 return AVERROR(ENOMEM);
1026 /* 64 subbands QMF */
1027 for (k = 0; k < s->prim_channels; k++) {
1028 if (s->channel_order_tab[k] >= 0)
1029 qmf_64_subbands(s, k, subband_samples[k],
1030 s->samples_chanptr[s->channel_order_tab[k]],
1031 /* Upsampling needs a factor 2 here. */
1035 /* 32 subbands QMF */
1036 for (k = 0; k < s->prim_channels; k++) {
1037 if (s->channel_order_tab[k] >= 0)
1038 qmf_32_subbands(s, k, subband_samples[k],
1039 s->samples_chanptr[s->channel_order_tab[k]],
1040 M_SQRT1_2 / 32768.0);
1044 /* Generate LFE samples for this subsubframe FIXME!!! */
1046 float *samples = s->samples_chanptr[s->lfe_index];
1047 lfe_interpolation_fir(s,
1048 s->lfe_data + 2 * s->lfe * (block_index + 4),
1052 /* Should apply the filter in Table 6-11 when upsampling. For
1053 * now, just duplicate. */
1054 for (i = 255; i > 0; i--) {
1056 samples[2 * i + 1] = samples[i];
1058 samples[1] = samples[0];
1062 /* FIXME: This downmixing is probably broken with upsample.
1063 * Probably totally broken also with XLL in general. */
1064 /* Downmixing to Stereo */
1065 if (s->prim_channels + !!s->lfe > 2 &&
1066 s->avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
1067 dca_downmix(s->samples_chanptr, s->amode, !!s->lfe, s->downmix_coef,
1068 s->channel_order_tab);
1074 static int dca_subframe_footer(DCAContext *s, int base_channel)
1076 int in, out, aux_data_count, aux_data_end, reserved;
1080 * Unpack optional information
1083 /* presumably optional information only appears in the core? */
1084 if (!base_channel) {
1086 skip_bits_long(&s->gb, 32);
1089 aux_data_count = get_bits(&s->gb, 6);
1092 skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
1094 aux_data_end = 8 * aux_data_count + get_bits_count(&s->gb);
1096 if ((nsyncaux = get_bits_long(&s->gb, 32)) != DCA_NSYNCAUX) {
1097 av_log(s->avctx, AV_LOG_ERROR, "nSYNCAUX mismatch %#"PRIx32"\n",
1099 return AVERROR_INVALIDDATA;
1102 if (get_bits1(&s->gb)) { // bAUXTimeStampFlag
1103 avpriv_request_sample(s->avctx,
1104 "Auxiliary Decode Time Stamp Flag");
1106 skip_bits(&s->gb, (-get_bits_count(&s->gb)) & 4);
1107 // 44 bits: nMSByte (8), nMarker (4), nLSByte (28), nMarker (4)
1108 skip_bits_long(&s->gb, 44);
1111 if ((s->core_downmix = get_bits1(&s->gb))) {
1112 int am = get_bits(&s->gb, 3);
1115 s->core_downmix_amode = DCA_MONO;
1118 s->core_downmix_amode = DCA_STEREO;
1121 s->core_downmix_amode = DCA_STEREO_TOTAL;
1124 s->core_downmix_amode = DCA_3F;
1127 s->core_downmix_amode = DCA_2F1R;
1130 s->core_downmix_amode = DCA_2F2R;
1133 s->core_downmix_amode = DCA_3F1R;
1136 av_log(s->avctx, AV_LOG_ERROR,
1137 "Invalid mode %d for embedded downmix coefficients\n",
1139 return AVERROR_INVALIDDATA;
1141 for (out = 0; out < ff_dca_channels[s->core_downmix_amode]; out++) {
1142 for (in = 0; in < s->prim_channels + !!s->lfe; in++) {
1143 uint16_t tmp = get_bits(&s->gb, 9);
1144 if ((tmp & 0xFF) > 241) {
1145 av_log(s->avctx, AV_LOG_ERROR,
1146 "Invalid downmix coefficient code %"PRIu16"\n",
1148 return AVERROR_INVALIDDATA;
1150 s->core_downmix_codes[in][out] = tmp;
1155 align_get_bits(&s->gb); // byte align
1156 skip_bits(&s->gb, 16); // nAUXCRC16
1158 // additional data (reserved, cf. ETSI TS 102 114 V1.4.1)
1159 if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {
1160 av_log(s->avctx, AV_LOG_ERROR,
1161 "Overread auxiliary data by %d bits\n", -reserved);
1162 return AVERROR_INVALIDDATA;
1163 } else if (reserved) {
1164 avpriv_request_sample(s->avctx,
1165 "Core auxiliary data reserved content");
1166 skip_bits_long(&s->gb, reserved);
1170 if (s->crc_present && s->dynrange)
1171 get_bits(&s->gb, 16);
1178 * Decode a dca frame block
1180 * @param s pointer to the DCAContext
1183 static int dca_decode_block(DCAContext *s, int base_channel, int block_index)
1188 if (s->current_subframe >= s->subframes) {
1189 av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",
1190 s->current_subframe, s->subframes);
1191 return AVERROR_INVALIDDATA;
1194 if (!s->current_subsubframe) {
1195 /* Read subframe header */
1196 if ((ret = dca_subframe_header(s, base_channel, block_index)))
1200 /* Read subsubframe */
1201 if ((ret = dca_subsubframe(s, base_channel, block_index)))
1205 s->current_subsubframe++;
1206 if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {
1207 s->current_subsubframe = 0;
1208 s->current_subframe++;
1210 if (s->current_subframe >= s->subframes) {
1211 /* Read subframe footer */
1212 if ((ret = dca_subframe_footer(s, base_channel)))
1219 int ff_dca_xbr_parse_frame(DCAContext *s)
1221 int scale_table_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS][2];
1222 int active_bands[DCA_CHSETS_MAX][DCA_CHSET_CHANS_MAX];
1223 int abits_high[DCA_CHSET_CHANS_MAX][DCA_SUBBANDS];
1224 int anctemp[DCA_CHSET_CHANS_MAX];
1225 int chset_fsize[DCA_CHSETS_MAX];
1226 int n_xbr_ch[DCA_CHSETS_MAX];
1227 int hdr_size, num_chsets, xbr_tmode, hdr_pos;
1228 int i, j, k, l, chset, chan_base;
1230 av_log(s->avctx, AV_LOG_DEBUG, "DTS-XBR: decoding XBR extension\n");
1232 /* get bit position of sync header */
1233 hdr_pos = get_bits_count(&s->gb) - 32;
1235 hdr_size = get_bits(&s->gb, 6) + 1;
1236 num_chsets = get_bits(&s->gb, 2) + 1;
1238 for(i = 0; i < num_chsets; i++)
1239 chset_fsize[i] = get_bits(&s->gb, 14) + 1;
1241 xbr_tmode = get_bits1(&s->gb);
1243 for(i = 0; i < num_chsets; i++) {
1244 n_xbr_ch[i] = get_bits(&s->gb, 3) + 1;
1245 k = get_bits(&s->gb, 2) + 5;
1246 for(j = 0; j < n_xbr_ch[i]; j++) {
1247 active_bands[i][j] = get_bits(&s->gb, k) + 1;
1248 if (active_bands[i][j] > DCA_SUBBANDS) {
1249 av_log(s->avctx, AV_LOG_ERROR, "too many active subbands (%d)\n", active_bands[i][j]);
1250 return AVERROR_INVALIDDATA;
1255 /* skip to the end of the header */
1256 i = get_bits_count(&s->gb);
1257 if(hdr_pos + hdr_size * 8 > i)
1258 skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);
1260 /* loop over the channel data sets */
1261 /* only decode as many channels as we've decoded base data for */
1262 for(chset = 0, chan_base = 0;
1263 chset < num_chsets && chan_base + n_xbr_ch[chset] <= s->prim_channels;
1264 chan_base += n_xbr_ch[chset++]) {
1265 int start_posn = get_bits_count(&s->gb);
1266 int subsubframe = 0;
1269 /* loop over subframes */
1270 for (k = 0; k < (s->sample_blocks / 8); k++) {
1271 /* parse header if we're on first subsubframe of a block */
1272 if(subsubframe == 0) {
1273 /* Parse subframe header */
1274 for(i = 0; i < n_xbr_ch[chset]; i++) {
1275 anctemp[i] = get_bits(&s->gb, 2) + 2;
1278 for(i = 0; i < n_xbr_ch[chset]; i++) {
1279 get_array(&s->gb, abits_high[i], active_bands[chset][i], anctemp[i]);
1282 for(i = 0; i < n_xbr_ch[chset]; i++) {
1283 anctemp[i] = get_bits(&s->gb, 3);
1284 if(anctemp[i] < 1) {
1285 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: SYNC ERROR\n");
1286 return AVERROR_INVALIDDATA;
1290 /* generate scale factors */
1291 for(i = 0; i < n_xbr_ch[chset]; i++) {
1292 const uint32_t *scale_table;
1294 int scale_table_size;
1296 if (s->scalefactor_huffman[chan_base+i] == 6) {
1297 scale_table = ff_dca_scale_factor_quant7;
1298 scale_table_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant7);
1300 scale_table = ff_dca_scale_factor_quant6;
1301 scale_table_size = FF_ARRAY_ELEMS(ff_dca_scale_factor_quant6);
1306 for(j = 0; j < active_bands[chset][i]; j++) {
1307 if(abits_high[i][j] > 0) {
1308 int index = get_bits(&s->gb, nbits);
1309 if (index >= scale_table_size) {
1310 av_log(s->avctx, AV_LOG_ERROR, "scale table index %d invalid\n", index);
1311 return AVERROR_INVALIDDATA;
1313 scale_table_high[i][j][0] = scale_table[index];
1315 if(xbr_tmode && s->transition_mode[i][j]) {
1316 int index = get_bits(&s->gb, nbits);
1317 if (index >= scale_table_size) {
1318 av_log(s->avctx, AV_LOG_ERROR, "scale table index %d invalid\n", index);
1319 return AVERROR_INVALIDDATA;
1321 scale_table_high[i][j][1] = scale_table[index];
1328 /* decode audio array for this block */
1329 for(i = 0; i < n_xbr_ch[chset]; i++) {
1330 for(j = 0; j < active_bands[chset][i]; j++) {
1331 const int xbr_abits = abits_high[i][j];
1332 const float quant_step_size = ff_dca_lossless_quant_d[xbr_abits];
1333 const int sfi = xbr_tmode && s->transition_mode[i][j] && subsubframe >= s->transition_mode[i][j];
1334 const float rscale = quant_step_size * scale_table_high[i][j][sfi];
1335 float *subband_samples = s->subband_samples[k][chan_base+i][j];
1342 get_array(&s->gb, block, 8, xbr_abits - 3);
1344 int block_code1, block_code2, size, levels, err;
1346 size = abits_sizes[xbr_abits - 1];
1347 levels = abits_levels[xbr_abits - 1];
1349 block_code1 = get_bits(&s->gb, size);
1350 block_code2 = get_bits(&s->gb, size);
1351 err = decode_blockcodes(block_code1, block_code2,
1354 av_log(s->avctx, AV_LOG_ERROR,
1355 "ERROR: DTS-XBR: block code look-up failed\n");
1356 return AVERROR_INVALIDDATA;
1360 /* scale & sum into subband */
1361 for(l = 0; l < 8; l++)
1362 subband_samples[l] += (float)block[l] * rscale;
1366 /* check DSYNC marker */
1367 if(s->aspf || subsubframe == s->subsubframes[subframe] - 1) {
1368 if(get_bits(&s->gb, 16) != 0xffff) {
1369 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: Didn't get subframe DSYNC\n");
1370 return AVERROR_INVALIDDATA;
1374 /* advance sub-sub-frame index */
1375 if(++subsubframe >= s->subsubframes[subframe]) {
1381 /* skip to next channel set */
1382 i = get_bits_count(&s->gb);
1383 if(start_posn + chset_fsize[chset] * 8 != i) {
1384 j = start_posn + chset_fsize[chset] * 8 - i;
1386 av_log(s->avctx, AV_LOG_ERROR, "DTS-XBR: end of channel set,"
1387 " skipping further than expected (%d bits)\n", j);
1388 skip_bits_long(&s->gb, j);
1396 /* parse initial header for XXCH and dump details */
1397 int ff_dca_xxch_decode_frame(DCAContext *s)
1399 int hdr_size, spkmsk_bits, num_chsets, core_spk, hdr_pos;
1400 int i, chset, base_channel, chstart, fsize[8];
1402 /* assume header word has already been parsed */
1403 hdr_pos = get_bits_count(&s->gb) - 32;
1404 hdr_size = get_bits(&s->gb, 6) + 1;
1405 /*chhdr_crc =*/ skip_bits1(&s->gb);
1406 spkmsk_bits = get_bits(&s->gb, 5) + 1;
1407 num_chsets = get_bits(&s->gb, 2) + 1;
1409 for (i = 0; i < num_chsets; i++)
1410 fsize[i] = get_bits(&s->gb, 14) + 1;
1412 core_spk = get_bits(&s->gb, spkmsk_bits);
1413 s->xxch_core_spkmask = core_spk;
1414 s->xxch_nbits_spk_mask = spkmsk_bits;
1415 s->xxch_dmix_embedded = 0;
1417 /* skip to the end of the header */
1418 i = get_bits_count(&s->gb);
1419 if (hdr_pos + hdr_size * 8 > i)
1420 skip_bits_long(&s->gb, hdr_pos + hdr_size * 8 - i);
1422 for (chset = 0; chset < num_chsets; chset++) {
1423 chstart = get_bits_count(&s->gb);
1424 base_channel = s->prim_channels;
1425 s->xxch_chset = chset;
1427 /* XXCH and Core headers differ, see 6.4.2 "XXCH Channel Set Header" vs.
1428 5.3.2 "Primary Audio Coding Header", DTS Spec 1.3.1 */
1429 dca_parse_audio_coding_header(s, base_channel, 1);
1431 /* decode channel data */
1432 for (i = 0; i < (s->sample_blocks / 8); i++) {
1433 if (dca_decode_block(s, base_channel, i)) {
1434 av_log(s->avctx, AV_LOG_ERROR,
1435 "Error decoding DTS-XXCH extension\n");
1440 /* skip to end of this section */
1441 i = get_bits_count(&s->gb);
1442 if (chstart + fsize[chset] * 8 > i)
1443 skip_bits_long(&s->gb, chstart + fsize[chset] * 8 - i);
1445 s->xxch_chset = num_chsets;
1450 static float dca_dmix_code(unsigned code)
1452 int sign = (code >> 8) - 1;
1454 return ((ff_dca_dmixtable[code] ^ sign) - sign) * (1.0 / (1 << 15));
1457 static int scan_for_extensions(AVCodecContext *avctx)
1459 DCAContext *s = avctx->priv_data;
1460 int core_ss_end, ret = 0;
1462 core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;
1464 /* only scan for extensions if ext_descr was unknown or indicated a
1465 * supported XCh extension */
1466 if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {
1467 /* if ext_descr was unknown, clear s->core_ext_mask so that the
1468 * extensions scan can fill it up */
1469 s->core_ext_mask = FFMAX(s->core_ext_mask, 0);
1471 /* extensions start at 32-bit boundaries into bitstream */
1472 skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
1474 while (core_ss_end - get_bits_count(&s->gb) >= 32) {
1475 uint32_t bits = get_bits_long(&s->gb, 32);
1479 case DCA_SYNCWORD_XCH: {
1480 int ext_amode, xch_fsize;
1482 s->xch_base_channel = s->prim_channels;
1484 /* validate sync word using XCHFSIZE field */
1485 xch_fsize = show_bits(&s->gb, 10);
1486 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&
1487 (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))
1490 /* skip length-to-end-of-frame field for the moment */
1491 skip_bits(&s->gb, 10);
1493 s->core_ext_mask |= DCA_EXT_XCH;
1495 /* extension amode(number of channels in extension) should be 1 */
1496 /* AFAIK XCh is not used for more channels */
1497 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {
1498 av_log(avctx, AV_LOG_ERROR,
1499 "XCh extension amode %d not supported!\n",
1504 if (s->xch_base_channel < 2) {
1505 avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");
1509 /* much like core primary audio coding header */
1510 dca_parse_audio_coding_header(s, s->xch_base_channel, 0);
1512 for (i = 0; i < (s->sample_blocks / 8); i++)
1513 if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {
1514 av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");
1521 case DCA_SYNCWORD_XXCH:
1522 /* XXCh: extended channels */
1523 /* usually found either in core or HD part in DTS-HD HRA streams,
1524 * but not in DTS-ES which contains XCh extensions instead */
1525 s->core_ext_mask |= DCA_EXT_XXCH;
1526 ff_dca_xxch_decode_frame(s);
1530 int fsize96 = show_bits(&s->gb, 12) + 1;
1531 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)
1534 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",
1535 get_bits_count(&s->gb));
1536 skip_bits(&s->gb, 12);
1537 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);
1538 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));
1540 s->core_ext_mask |= DCA_EXT_X96;
1545 skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
1548 /* no supported extensions, skip the rest of the core substream */
1549 skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));
1552 if (s->core_ext_mask & DCA_EXT_X96)
1553 s->profile = FF_PROFILE_DTS_96_24;
1554 else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))
1555 s->profile = FF_PROFILE_DTS_ES;
1557 /* check for ExSS (HD part) */
1558 if (s->dca_buffer_size - s->frame_size > 32 &&
1559 get_bits_long(&s->gb, 32) == DCA_SYNCWORD_SUBSTREAM)
1560 ff_dca_exss_parse_header(s);
1565 static int set_channel_layout(AVCodecContext *avctx, int *channels, int num_core_channels)
1567 DCAContext *s = avctx->priv_data;
1568 int i, j, chset, mask;
1569 int channel_layout, channel_mask;
1572 /* If we have XXCH then the channel layout is managed differently */
1573 /* note that XLL will also have another way to do things */
1574 if (!(s->core_ext_mask & DCA_EXT_XXCH)) {
1575 /* xxx should also do MA extensions */
1576 if (s->amode < 16) {
1577 avctx->channel_layout = ff_dca_core_channel_layout[s->amode];
1579 if (s->prim_channels + !!s->lfe > 2 &&
1580 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
1582 * Neither the core's auxiliary data nor our default tables contain
1583 * downmix coefficients for the additional channel coded in the XCh
1584 * extension, so when we're doing a Stereo downmix, don't decode it.
1589 if (s->xch_present && !s->xch_disable) {
1590 if (avctx->channel_layout & AV_CH_BACK_CENTER) {
1591 avpriv_request_sample(avctx, "XCh with Back center channel");
1592 return AVERROR_INVALIDDATA;
1594 avctx->channel_layout |= AV_CH_BACK_CENTER;
1596 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;
1597 s->channel_order_tab = ff_dca_channel_reorder_lfe_xch[s->amode];
1599 s->channel_order_tab = ff_dca_channel_reorder_nolfe_xch[s->amode];
1601 if (s->channel_order_tab[s->xch_base_channel] < 0)
1602 return AVERROR_INVALIDDATA;
1604 *channels = num_core_channels + !!s->lfe;
1605 s->xch_present = 0; /* disable further xch processing */
1607 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;
1608 s->channel_order_tab = ff_dca_channel_reorder_lfe[s->amode];
1610 s->channel_order_tab = ff_dca_channel_reorder_nolfe[s->amode];
1613 if (*channels > !!s->lfe &&
1614 s->channel_order_tab[*channels - 1 - !!s->lfe] < 0)
1615 return AVERROR_INVALIDDATA;
1617 if (av_get_channel_layout_nb_channels(avctx->channel_layout) != *channels) {
1618 av_log(avctx, AV_LOG_ERROR, "Number of channels %d mismatches layout %d\n", *channels, av_get_channel_layout_nb_channels(avctx->channel_layout));
1619 return AVERROR_INVALIDDATA;
1622 if (num_core_channels + !!s->lfe > 2 &&
1623 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
1625 s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;
1626 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
1628 else if (avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE) {
1629 static const int8_t dca_channel_order_native[9] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
1630 s->channel_order_tab = dca_channel_order_native;
1632 s->lfe_index = ff_dca_lfe_index[s->amode];
1634 av_log(avctx, AV_LOG_ERROR,
1635 "Non standard configuration %d !\n", s->amode);
1636 return AVERROR_INVALIDDATA;
1639 s->xxch_dmix_embedded = 0;
1641 /* we only get here if an XXCH channel set can be added to the mix */
1642 channel_mask = s->xxch_core_spkmask;
1645 *channels = s->prim_channels + !!s->lfe;
1646 for (i = 0; i < s->xxch_chset; i++) {
1647 channel_mask |= s->xxch_spk_masks[i];
1651 /* Given the DTS spec'ed channel mask, generate an avcodec version */
1653 for (i = 0; i < s->xxch_nbits_spk_mask; ++i) {
1654 if (channel_mask & (1 << i)) {
1655 channel_layout |= ff_dca_map_xxch_to_native[i];
1659 /* make sure that we have managed to get equivalent dts/avcodec channel
1660 * masks in some sense -- unfortunately some channels could overlap */
1661 if (av_popcount(channel_mask) != av_popcount(channel_layout)) {
1662 av_log(avctx, AV_LOG_DEBUG,
1663 "DTS-XXCH: Inconsistent avcodec/dts channel layouts\n");
1664 return AVERROR_INVALIDDATA;
1667 avctx->channel_layout = channel_layout;
1669 if (!(avctx->request_channel_layout & AV_CH_LAYOUT_NATIVE)) {
1670 /* Estimate DTS --> avcodec ordering table */
1671 for (chset = -1, j = 0; chset < s->xxch_chset; ++chset) {
1672 mask = chset >= 0 ? s->xxch_spk_masks[chset]
1673 : s->xxch_core_spkmask;
1674 for (i = 0; i < s->xxch_nbits_spk_mask; i++) {
1675 if (mask & ~(DCA_XXCH_LFE1 | DCA_XXCH_LFE2) & (1 << i)) {
1676 lavc = ff_dca_map_xxch_to_native[i];
1677 posn = av_popcount(channel_layout & (lavc - 1));
1678 s->xxch_order_tab[j++] = posn;
1684 s->lfe_index = av_popcount(channel_layout & (AV_CH_LOW_FREQUENCY-1));
1685 } else { /* native ordering */
1686 for (i = 0; i < *channels; i++)
1687 s->xxch_order_tab[i] = i;
1689 s->lfe_index = *channels - 1;
1692 s->channel_order_tab = s->xxch_order_tab;
1699 * Main frame decoding function
1700 * FIXME add arguments
1702 static int dca_decode_frame(AVCodecContext *avctx, void *data,
1703 int *got_frame_ptr, AVPacket *avpkt)
1705 AVFrame *frame = data;
1706 const uint8_t *buf = avpkt->data;
1707 int buf_size = avpkt->size;
1709 int num_core_channels = 0;
1711 float **samples_flt;
1714 DCAContext *s = avctx->priv_data;
1715 int channels, full_channels;
1724 s->exss_ext_mask = 0;
1727 s->dca_buffer_size = AVERROR_INVALIDDATA;
1728 for (i = 0; i < buf_size - 3 && s->dca_buffer_size == AVERROR_INVALIDDATA; i++)
1729 s->dca_buffer_size = avpriv_dca_convert_bitstream(buf + i, buf_size - i, s->dca_buffer,
1730 DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);
1732 if (s->dca_buffer_size == AVERROR_INVALIDDATA) {
1733 av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
1734 return AVERROR_INVALIDDATA;
1737 if ((ret = dca_parse_frame_header(s)) < 0) {
1738 // seems like the frame is corrupt, try with the next one
1741 // set AVCodec values with parsed data
1742 avctx->sample_rate = s->sample_rate;
1744 s->profile = FF_PROFILE_DTS;
1746 for (i = 0; i < (s->sample_blocks / SAMPLES_PER_SUBBAND); i++) {
1747 if ((ret = dca_decode_block(s, 0, i))) {
1748 av_log(avctx, AV_LOG_ERROR, "error decoding block\n");
1753 /* record number of core channels incase less than max channels are requested */
1754 num_core_channels = s->prim_channels;
1756 if (s->prim_channels + !!s->lfe > 2 &&
1757 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
1758 /* Stereo downmix coefficients
1760 * The decoder can only downmix to 2-channel, so we need to ensure
1761 * embedded downmix coefficients are actually targeting 2-channel.
1763 if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||
1764 s->core_downmix_amode == DCA_STEREO_TOTAL)) {
1765 for (i = 0; i < num_core_channels + !!s->lfe; i++) {
1766 /* Range checked earlier */
1767 s->downmix_coef[i][0] = dca_dmix_code(s->core_downmix_codes[i][0]);
1768 s->downmix_coef[i][1] = dca_dmix_code(s->core_downmix_codes[i][1]);
1770 s->output = s->core_downmix_amode;
1772 int am = s->amode & DCA_CHANNEL_MASK;
1773 if (am >= FF_ARRAY_ELEMS(ff_dca_default_coeffs)) {
1774 av_log(s->avctx, AV_LOG_ERROR,
1775 "Invalid channel mode %d\n", am);
1776 return AVERROR_INVALIDDATA;
1778 if (num_core_channels + !!s->lfe >
1779 FF_ARRAY_ELEMS(ff_dca_default_coeffs[0])) {
1780 avpriv_request_sample(s->avctx, "Downmixing %d channels",
1781 s->prim_channels + !!s->lfe);
1782 return AVERROR_PATCHWELCOME;
1784 for (i = 0; i < num_core_channels + !!s->lfe; i++) {
1785 s->downmix_coef[i][0] = ff_dca_default_coeffs[am][i][0];
1786 s->downmix_coef[i][1] = ff_dca_default_coeffs[am][i][1];
1789 ff_dlog(s->avctx, "Stereo downmix coeffs:\n");
1790 for (i = 0; i < num_core_channels + !!s->lfe; i++) {
1791 ff_dlog(s->avctx, "L, input channel %d = %f\n", i,
1792 s->downmix_coef[i][0]);
1793 ff_dlog(s->avctx, "R, input channel %d = %f\n", i,
1794 s->downmix_coef[i][1]);
1796 ff_dlog(s->avctx, "\n");
1800 s->core_ext_mask = ff_dca_ext_audio_descr_mask[s->ext_descr];
1802 s->core_ext_mask = 0;
1804 ret = scan_for_extensions(avctx);
1806 avctx->profile = s->profile;
1808 full_channels = channels = s->prim_channels + !!s->lfe;
1810 ret = set_channel_layout(avctx, &channels, num_core_channels);
1814 /* get output buffer */
1815 frame->nb_samples = 256 * (s->sample_blocks / SAMPLES_PER_SUBBAND);
1816 if (s->exss_ext_mask & DCA_EXT_EXSS_XLL) {
1817 int xll_nb_samples = s->xll_segments * s->xll_smpl_in_seg;
1818 /* Check for invalid/unsupported conditions first */
1819 if (s->xll_residual_channels > channels) {
1820 av_log(s->avctx, AV_LOG_WARNING,
1821 "DCA: too many residual channels (%d, core channels %d). Disabling XLL\n",
1822 s->xll_residual_channels, channels);
1823 s->exss_ext_mask &= ~DCA_EXT_EXSS_XLL;
1824 } else if (xll_nb_samples != frame->nb_samples &&
1825 2 * frame->nb_samples != xll_nb_samples) {
1826 av_log(s->avctx, AV_LOG_WARNING,
1827 "DCA: unsupported upsampling (%d XLL samples, %d core samples). Disabling XLL\n",
1828 xll_nb_samples, frame->nb_samples);
1829 s->exss_ext_mask &= ~DCA_EXT_EXSS_XLL;
1831 if (2 * frame->nb_samples == xll_nb_samples) {
1832 av_log(s->avctx, AV_LOG_INFO,
1833 "XLL: upsampling core channels by a factor of 2\n");
1836 frame->nb_samples = xll_nb_samples;
1837 // FIXME: Is it good enough to copy from the first channel set?
1838 avctx->sample_rate = s->xll_chsets[0].sampling_frequency;
1840 /* If downmixing to stereo, don't decode additional channels.
1841 * FIXME: Using the xch_disable flag for this doesn't seem right. */
1842 if (!s->xch_disable)
1843 channels = s->xll_channels;
1847 if (avctx->channels != channels) {
1848 if (avctx->channels)
1849 av_log(avctx, AV_LOG_INFO, "Number of channels changed in DCA decoder (%d -> %d)\n", avctx->channels, channels);
1850 avctx->channels = channels;
1853 /* FIXME: This is an ugly hack, to just revert to the default
1854 * layout if we have additional channels. Need to convert the XLL
1855 * channel masks to ffmpeg channel_layout mask. */
1856 if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels)
1857 avctx->channel_layout = 0;
1859 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1861 samples_flt = (float **) frame->extended_data;
1863 /* allocate buffer for extra channels if downmixing */
1864 if (avctx->channels < full_channels) {
1865 ret = av_samples_get_buffer_size(NULL, full_channels - channels,
1867 avctx->sample_fmt, 0);
1871 av_fast_malloc(&s->extra_channels_buffer,
1872 &s->extra_channels_buffer_size, ret);
1873 if (!s->extra_channels_buffer)
1874 return AVERROR(ENOMEM);
1876 ret = av_samples_fill_arrays((uint8_t **) s->extra_channels, NULL,
1877 s->extra_channels_buffer,
1878 full_channels - channels,
1879 frame->nb_samples, avctx->sample_fmt, 0);
1884 /* filter to get final output */
1885 for (i = 0; i < (s->sample_blocks / SAMPLES_PER_SUBBAND); i++) {
1887 unsigned block = upsample ? 512 : 256;
1888 for (ch = 0; ch < channels; ch++)
1889 s->samples_chanptr[ch] = samples_flt[ch] + i * block;
1890 for (; ch < full_channels; ch++)
1891 s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * block;
1893 dca_filter_channels(s, i, upsample);
1895 /* If this was marked as a DTS-ES stream we need to subtract back- */
1896 /* channel from SL & SR to remove matrixed back-channel signal */
1897 if ((s->source_pcm_res & 1) && s->xch_present) {
1898 float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];
1899 float *lt_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];
1900 float *rt_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];
1901 s->fdsp->vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);
1902 s->fdsp->vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);
1905 /* If stream contains XXCH, we might need to undo an embedded downmix */
1906 if (s->xxch_dmix_embedded) {
1907 /* Loop over channel sets in turn */
1908 ch = num_core_channels;
1909 for (chset = 0; chset < s->xxch_chset; chset++) {
1910 endch = ch + s->xxch_chset_nch[chset];
1911 mask = s->xxch_dmix_embedded;
1914 for (j = ch; j < endch; j++) {
1915 if (mask & (1 << j)) { /* this channel has been mixed-out */
1916 src_chan = s->samples_chanptr[s->channel_order_tab[j]];
1917 for (k = 0; k < endch; k++) {
1918 achan = s->channel_order_tab[k];
1919 scale = s->xxch_dmix_coeff[j][k];
1921 dst_chan = s->samples_chanptr[achan];
1922 s->fdsp->vector_fmac_scalar(dst_chan, src_chan,
1929 /* if a downmix has been embedded then undo the pre-scaling */
1930 if ((mask & (1 << ch)) && s->xxch_dmix_sf[chset] != 1.0f) {
1931 scale = s->xxch_dmix_sf[chset];
1933 for (j = 0; j < ch; j++) {
1934 src_chan = s->samples_chanptr[s->channel_order_tab[j]];
1935 for (k = 0; k < 256; k++)
1936 src_chan[k] *= scale;
1939 /* LFE channel is always part of core, scale if it exists */
1941 src_chan = s->samples_chanptr[s->lfe_index];
1942 for (k = 0; k < 256; k++)
1943 src_chan[k] *= scale;
1953 /* update lfe history */
1954 lfe_samples = 2 * s->lfe * (s->sample_blocks / SAMPLES_PER_SUBBAND);
1955 for (i = 0; i < 2 * s->lfe * 4; i++)
1956 s->lfe_data[i] = s->lfe_data[i + lfe_samples];
1958 if (s->exss_ext_mask & DCA_EXT_EXSS_XLL) {
1959 ret = ff_dca_xll_decode_audio(s, frame);
1965 * DCA_STEREO_TOTAL (Lt/Rt) is equivalent to Dolby Surround */
1966 ret = ff_side_data_update_matrix_encoding(frame,
1967 (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?
1968 AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);
1972 if ( avctx->profile != FF_PROFILE_DTS_HD_MA
1973 && avctx->profile != FF_PROFILE_DTS_HD_HRA)
1974 avctx->bit_rate = s->bit_rate;
1981 * DCA initialization
1983 * @param avctx pointer to the AVCodecContext
1986 static av_cold int dca_decode_init(AVCodecContext *avctx)
1988 DCAContext *s = avctx->priv_data;
1993 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
1995 return AVERROR(ENOMEM);
1997 ff_mdct_init(&s->imdct, 6, 1, 1.0);
1998 ff_synth_filter_init(&s->synth);
1999 ff_dcadsp_init(&s->dcadsp);
2000 ff_fmt_convert_init(&s->fmt_conv, avctx);
2002 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
2004 /* allow downmixing to stereo */
2005 if (avctx->channels > 2 &&
2006 avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)
2007 avctx->channels = 2;
2012 static av_cold int dca_decode_end(AVCodecContext *avctx)
2014 DCAContext *s = avctx->priv_data;
2015 ff_mdct_end(&s->imdct);
2016 av_freep(&s->extra_channels_buffer);
2018 av_freep(&s->xll_sample_buf);
2019 av_freep(&s->qmf64_table);
2023 static const AVProfile profiles[] = {
2024 { FF_PROFILE_DTS, "DTS" },
2025 { FF_PROFILE_DTS_ES, "DTS-ES" },
2026 { FF_PROFILE_DTS_96_24, "DTS 96/24" },
2027 { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },
2028 { FF_PROFILE_DTS_HD_MA, "DTS-HD MA" },
2029 { FF_PROFILE_UNKNOWN },
2032 static const AVOption options[] = {
2033 { "disable_xch", "disable decoding of the XCh extension", offsetof(DCAContext, xch_disable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM },
2034 { "disable_xll", "disable decoding of the XLL extension", offsetof(DCAContext, xll_disable), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM },
2038 static const AVClass dca_decoder_class = {
2039 .class_name = "DCA decoder",
2040 .item_name = av_default_item_name,
2042 .version = LIBAVUTIL_VERSION_INT,
2043 .category = AV_CLASS_CATEGORY_DECODER,
2046 AVCodec ff_dca_decoder = {
2048 .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),
2049 .type = AVMEDIA_TYPE_AUDIO,
2050 .id = AV_CODEC_ID_DTS,
2051 .priv_data_size = sizeof(DCAContext),
2052 .init = dca_decode_init,
2053 .decode = dca_decode_frame,
2054 .close = dca_decode_end,
2055 .capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1,
2056 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2057 AV_SAMPLE_FMT_NONE },
2058 .profiles = NULL_IF_CONFIG_SMALL(profiles),
2059 .priv_class = &dca_decoder_class,