3 * Copyright (c) 2007-2008 Ian Caulfield
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/internal.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/channel_layout.h"
35 #include "libavutil/crc.h"
37 #include "mlp_parser.h"
42 /** number of bits used for VLC lookup - longest Huffman code is 9 */
45 #define VLC_STATIC_SIZE 64
48 #define VLC_STATIC_SIZE 512
51 typedef struct SubStream {
52 /// Set if a valid restart header has been read. Otherwise the substream cannot be decoded.
56 /** restart header data */
57 /// The type of noise to be used in the rematrix stage.
60 /// The index of the first channel coded in this substream.
62 /// The index of the last channel coded in this substream.
64 /// The number of channels input into the rematrix stage.
65 uint8_t max_matrix_channel;
66 /// For each channel output by the matrix, the output channel to map it to
67 uint8_t ch_assign[MAX_CHANNELS];
68 /// The channel layout for this substream
70 /// The matrix encoding mode for this substream
71 enum AVMatrixEncoding matrix_encoding;
73 /// Channel coding parameters for channels in the substream
74 ChannelParams channel_params[MAX_CHANNELS];
76 /// The left shift applied to random noise in 0x31ea substreams.
78 /// The current seed value for the pseudorandom noise generator(s).
79 uint32_t noisegen_seed;
81 /// Set if the substream contains extra info to check the size of VLC blocks.
82 uint8_t data_check_present;
84 /// Bitmask of which parameter sets are conveyed in a decoding parameter block.
85 uint8_t param_presence_flags;
86 #define PARAM_BLOCKSIZE (1 << 7)
87 #define PARAM_MATRIX (1 << 6)
88 #define PARAM_OUTSHIFT (1 << 5)
89 #define PARAM_QUANTSTEP (1 << 4)
90 #define PARAM_FIR (1 << 3)
91 #define PARAM_IIR (1 << 2)
92 #define PARAM_HUFFOFFSET (1 << 1)
93 #define PARAM_PRESENCE (1 << 0)
99 /// Number of matrices to be applied.
100 uint8_t num_primitive_matrices;
102 /// matrix output channel
103 uint8_t matrix_out_ch[MAX_MATRICES];
105 /// Whether the LSBs of the matrix output are encoded in the bitstream.
106 uint8_t lsb_bypass[MAX_MATRICES];
107 /// Matrix coefficients, stored as 2.14 fixed point.
108 DECLARE_ALIGNED(32, int32_t, matrix_coeff)[MAX_MATRICES][MAX_CHANNELS];
109 /// Left shift to apply to noise values in 0x31eb substreams.
110 uint8_t matrix_noise_shift[MAX_MATRICES];
113 /// Left shift to apply to Huffman-decoded residuals.
114 uint8_t quant_step_size[MAX_CHANNELS];
116 /// number of PCM samples in current audio block
118 /// Number of PCM samples decoded so far in this frame.
121 /// Left shift to apply to decoded PCM values to get final 24-bit output.
122 int8_t output_shift[MAX_CHANNELS];
124 /// Running XOR of all output samples.
125 int32_t lossless_check_data;
129 typedef struct MLPDecodeContext {
130 AVCodecContext *avctx;
132 /// Current access unit being read has a major sync.
133 int is_major_sync_unit;
135 /// Size of the major sync unit, in bytes
136 int major_sync_header_size;
138 /// Set if a valid major sync block has been read. Otherwise no decoding is possible.
139 uint8_t params_valid;
141 /// Number of substreams contained within this stream.
142 uint8_t num_substreams;
144 /// Index of the last substream to decode - further substreams are skipped.
145 uint8_t max_decoded_substream;
147 /// Stream needs channel reordering to comply with FFmpeg's channel order
148 uint8_t needs_reordering;
150 /// number of PCM samples contained in each frame
151 int access_unit_size;
152 /// next power of two above the number of samples in each frame
153 int access_unit_size_pow2;
155 SubStream substream[MAX_SUBSTREAMS];
158 int filter_changed[MAX_CHANNELS][NUM_FILTERS];
160 int8_t noise_buffer[MAX_BLOCKSIZE_POW2];
161 int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS];
162 DECLARE_ALIGNED(32, int32_t, sample_buffer)[MAX_BLOCKSIZE][MAX_CHANNELS];
167 static const uint64_t thd_channel_order[] = {
168 AV_CH_FRONT_LEFT, AV_CH_FRONT_RIGHT, // LR
169 AV_CH_FRONT_CENTER, // C
170 AV_CH_LOW_FREQUENCY, // LFE
171 AV_CH_SIDE_LEFT, AV_CH_SIDE_RIGHT, // LRs
172 AV_CH_TOP_FRONT_LEFT, AV_CH_TOP_FRONT_RIGHT, // LRvh
173 AV_CH_FRONT_LEFT_OF_CENTER, AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
174 AV_CH_BACK_LEFT, AV_CH_BACK_RIGHT, // LRrs
175 AV_CH_BACK_CENTER, // Cs
176 AV_CH_TOP_CENTER, // Ts
177 AV_CH_SURROUND_DIRECT_LEFT, AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
178 AV_CH_WIDE_LEFT, AV_CH_WIDE_RIGHT, // LRw
179 AV_CH_TOP_FRONT_CENTER, // Cvh
180 AV_CH_LOW_FREQUENCY_2, // LFE2
183 static int mlp_channel_layout_subset(uint64_t channel_layout, uint64_t mask)
185 return channel_layout && ((channel_layout & mask) == channel_layout);
188 static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout,
193 if (av_get_channel_layout_nb_channels(channel_layout) <= index)
196 for (i = 0; i < FF_ARRAY_ELEMS(thd_channel_order); i++)
197 if (channel_layout & thd_channel_order[i] && !index--)
198 return thd_channel_order[i];
202 static VLC huff_vlc[3];
204 /** Initialize static data, constant between all invocations of the codec. */
206 static av_cold void init_static(void)
208 if (!huff_vlc[0].bits) {
209 INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
210 &ff_mlp_huffman_tables[0][0][1], 2, 1,
211 &ff_mlp_huffman_tables[0][0][0], 2, 1, VLC_STATIC_SIZE);
212 INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
213 &ff_mlp_huffman_tables[1][0][1], 2, 1,
214 &ff_mlp_huffman_tables[1][0][0], 2, 1, VLC_STATIC_SIZE);
215 INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
216 &ff_mlp_huffman_tables[2][0][1], 2, 1,
217 &ff_mlp_huffman_tables[2][0][0], 2, 1, VLC_STATIC_SIZE);
223 static inline int32_t calculate_sign_huff(MLPDecodeContext *m,
224 unsigned int substr, unsigned int ch)
226 SubStream *s = &m->substream[substr];
227 ChannelParams *cp = &s->channel_params[ch];
228 int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch];
229 int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1);
230 int32_t sign_huff_offset = cp->huff_offset;
232 if (cp->codebook > 0)
233 sign_huff_offset -= 7 << lsb_bits;
236 sign_huff_offset -= 1 << sign_shift;
238 return sign_huff_offset;
241 /** Read a sample, consisting of either, both or neither of entropy-coded MSBs
244 static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
245 unsigned int substr, unsigned int pos)
247 SubStream *s = &m->substream[substr];
248 unsigned int mat, channel;
250 for (mat = 0; mat < s->num_primitive_matrices; mat++)
251 if (s->lsb_bypass[mat])
252 m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp);
254 for (channel = s->min_channel; channel <= s->max_channel; channel++) {
255 ChannelParams *cp = &s->channel_params[channel];
256 int codebook = cp->codebook;
257 int quant_step_size = s->quant_step_size[channel];
258 int lsb_bits = cp->huff_lsbs - quant_step_size;
262 result = get_vlc2(gbp, huff_vlc[codebook-1].table,
263 VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS);
266 return AVERROR_INVALIDDATA;
269 result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
271 result += cp->sign_huff_offset;
272 result *= 1 << quant_step_size;
274 m->sample_buffer[pos + s->blockpos][channel] = result;
280 static av_cold int mlp_decode_init(AVCodecContext *avctx)
282 MLPDecodeContext *m = avctx->priv_data;
287 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
288 m->substream[substr].lossless_check_data = 0xffffffff;
289 ff_mlpdsp_init(&m->dsp);
294 /** Read a major sync info header - contains high level information about
295 * the stream - sample rate, channel arrangement etc. Most of this
296 * information is not actually necessary for decoding, only for playback.
299 static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
304 if ((ret = ff_mlp_read_major_sync(m->avctx, &mh, gb)) != 0)
307 if (mh.group1_bits == 0) {
308 av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n");
309 return AVERROR_INVALIDDATA;
311 if (mh.group2_bits > mh.group1_bits) {
312 av_log(m->avctx, AV_LOG_ERROR,
313 "Channel group 2 cannot have more bits per sample than group 1.\n");
314 return AVERROR_INVALIDDATA;
317 if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) {
318 av_log(m->avctx, AV_LOG_ERROR,
319 "Channel groups with differing sample rates are not currently supported.\n");
320 return AVERROR_INVALIDDATA;
323 if (mh.group1_samplerate == 0) {
324 av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n");
325 return AVERROR_INVALIDDATA;
327 if (mh.group1_samplerate > MAX_SAMPLERATE) {
328 av_log(m->avctx, AV_LOG_ERROR,
329 "Sampling rate %d is greater than the supported maximum (%d).\n",
330 mh.group1_samplerate, MAX_SAMPLERATE);
331 return AVERROR_INVALIDDATA;
333 if (mh.access_unit_size > MAX_BLOCKSIZE) {
334 av_log(m->avctx, AV_LOG_ERROR,
335 "Block size %d is greater than the supported maximum (%d).\n",
336 mh.access_unit_size, MAX_BLOCKSIZE);
337 return AVERROR_INVALIDDATA;
339 if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) {
340 av_log(m->avctx, AV_LOG_ERROR,
341 "Block size pow2 %d is greater than the supported maximum (%d).\n",
342 mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2);
343 return AVERROR_INVALIDDATA;
346 if (mh.num_substreams == 0)
347 return AVERROR_INVALIDDATA;
348 if (m->avctx->codec_id == AV_CODEC_ID_MLP && mh.num_substreams > 2) {
349 av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n");
350 return AVERROR_INVALIDDATA;
352 if (mh.num_substreams > MAX_SUBSTREAMS) {
353 avpriv_request_sample(m->avctx,
354 "%d substreams (more than the "
355 "maximum supported by the decoder)",
357 return AVERROR_PATCHWELCOME;
360 m->major_sync_header_size = mh.header_size;
362 m->access_unit_size = mh.access_unit_size;
363 m->access_unit_size_pow2 = mh.access_unit_size_pow2;
365 m->num_substreams = mh.num_substreams;
367 /* limit to decoding 3 substreams, as the 4th is used by Dolby Atmos for non-audio data */
368 m->max_decoded_substream = FFMIN(m->num_substreams - 1, 2);
370 m->avctx->sample_rate = mh.group1_samplerate;
371 m->avctx->frame_size = mh.access_unit_size;
373 m->avctx->bits_per_raw_sample = mh.group1_bits;
374 if (mh.group1_bits > 16)
375 m->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
377 m->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
378 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(m->substream[m->max_decoded_substream].ch_assign,
379 m->substream[m->max_decoded_substream].output_shift,
380 m->substream[m->max_decoded_substream].max_matrix_channel,
381 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
384 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
385 m->substream[substr].restart_seen = 0;
387 /* Set the layout for each substream. When there's more than one, the first
388 * substream is Stereo. Subsequent substreams' layouts are indicated in the
390 if (m->avctx->codec_id == AV_CODEC_ID_MLP) {
391 if (mh.stream_type != 0xbb) {
392 avpriv_request_sample(m->avctx,
393 "unexpected stream_type %X in MLP",
395 return AVERROR_PATCHWELCOME;
397 if ((substr = (mh.num_substreams > 1)))
398 m->substream[0].mask = AV_CH_LAYOUT_STEREO;
399 m->substream[substr].mask = mh.channel_layout_mlp;
401 if (mh.stream_type != 0xba) {
402 avpriv_request_sample(m->avctx,
403 "unexpected stream_type %X in !MLP",
405 return AVERROR_PATCHWELCOME;
407 if ((substr = (mh.num_substreams > 1)))
408 m->substream[0].mask = AV_CH_LAYOUT_STEREO;
409 if (mh.num_substreams > 2)
410 if (mh.channel_layout_thd_stream2)
411 m->substream[2].mask = mh.channel_layout_thd_stream2;
413 m->substream[2].mask = mh.channel_layout_thd_stream1;
414 m->substream[substr].mask = mh.channel_layout_thd_stream1;
416 if (m->avctx->channels<=2 && m->substream[substr].mask == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) {
417 av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n");
418 m->max_decoded_substream = 0;
419 if (m->avctx->channels==2)
420 m->avctx->channel_layout = AV_CH_LAYOUT_STEREO;
424 m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20;
426 /* Parse the TrueHD decoder channel modifiers and set each substream's
427 * AVMatrixEncoding accordingly.
429 * The meaning of the modifiers depends on the channel layout:
431 * - THD_CH_MODIFIER_LTRT, THD_CH_MODIFIER_LBINRBIN only apply to 2-channel
433 * - THD_CH_MODIFIER_MONO applies to 1-channel or 2-channel (dual mono)
435 * - THD_CH_MODIFIER_SURROUNDEX, THD_CH_MODIFIER_NOTSURROUNDEX only apply to
436 * layouts with an Ls/Rs channel pair
438 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
439 m->substream[substr].matrix_encoding = AV_MATRIX_ENCODING_NONE;
440 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) {
441 if (mh.num_substreams > 2 &&
442 mh.channel_layout_thd_stream2 & AV_CH_SIDE_LEFT &&
443 mh.channel_layout_thd_stream2 & AV_CH_SIDE_RIGHT &&
444 mh.channel_modifier_thd_stream2 == THD_CH_MODIFIER_SURROUNDEX)
445 m->substream[2].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
447 if (mh.num_substreams > 1 &&
448 mh.channel_layout_thd_stream1 & AV_CH_SIDE_LEFT &&
449 mh.channel_layout_thd_stream1 & AV_CH_SIDE_RIGHT &&
450 mh.channel_modifier_thd_stream1 == THD_CH_MODIFIER_SURROUNDEX)
451 m->substream[1].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
453 if (mh.num_substreams > 0)
454 switch (mh.channel_modifier_thd_stream0) {
455 case THD_CH_MODIFIER_LTRT:
456 m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
458 case THD_CH_MODIFIER_LBINRBIN:
459 m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
469 /** Read a restart header from a block in a substream. This contains parameters
470 * required to decode the audio that do not change very often. Generally
471 * (always) present only in blocks following a major sync. */
473 static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
474 const uint8_t *buf, unsigned int substr)
476 SubStream *s = &m->substream[substr];
480 uint8_t lossless_check;
481 int start_count = get_bits_count(gbp);
482 int min_channel, max_channel, max_matrix_channel;
483 const int std_max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP
484 ? MAX_MATRIX_CHANNEL_MLP
485 : MAX_MATRIX_CHANNEL_TRUEHD;
487 sync_word = get_bits(gbp, 13);
489 if (sync_word != 0x31ea >> 1) {
490 av_log(m->avctx, AV_LOG_ERROR,
491 "restart header sync incorrect (got 0x%04x)\n", sync_word);
492 return AVERROR_INVALIDDATA;
495 s->noise_type = get_bits1(gbp);
497 if (m->avctx->codec_id == AV_CODEC_ID_MLP && s->noise_type) {
498 av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n");
499 return AVERROR_INVALIDDATA;
502 skip_bits(gbp, 16); /* Output timestamp */
504 min_channel = get_bits(gbp, 4);
505 max_channel = get_bits(gbp, 4);
506 max_matrix_channel = get_bits(gbp, 4);
508 if (max_matrix_channel > std_max_matrix_channel) {
509 av_log(m->avctx, AV_LOG_ERROR,
510 "Max matrix channel cannot be greater than %d.\n",
511 std_max_matrix_channel);
512 return AVERROR_INVALIDDATA;
515 if (max_channel != max_matrix_channel) {
516 av_log(m->avctx, AV_LOG_ERROR,
517 "Max channel must be equal max matrix channel.\n");
518 return AVERROR_INVALIDDATA;
521 /* This should happen for TrueHD streams with >6 channels and MLP's noise
522 * type. It is not yet known if this is allowed. */
523 if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) {
524 avpriv_request_sample(m->avctx,
525 "%d channels (more than the "
526 "maximum supported by the decoder)",
528 return AVERROR_PATCHWELCOME;
531 if (min_channel > max_channel) {
532 av_log(m->avctx, AV_LOG_ERROR,
533 "Substream min channel cannot be greater than max channel.\n");
534 return AVERROR_INVALIDDATA;
537 s->min_channel = min_channel;
538 s->max_channel = max_channel;
539 s->max_matrix_channel = max_matrix_channel;
541 if (mlp_channel_layout_subset(m->avctx->request_channel_layout, s->mask) &&
542 m->max_decoded_substream > substr) {
543 av_log(m->avctx, AV_LOG_DEBUG,
544 "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. "
545 "Further substreams will be skipped.\n",
546 s->max_channel + 1, s->mask, substr);
547 m->max_decoded_substream = substr;
550 s->noise_shift = get_bits(gbp, 4);
551 s->noisegen_seed = get_bits(gbp, 23);
555 s->data_check_present = get_bits1(gbp);
556 lossless_check = get_bits(gbp, 8);
557 if (substr == m->max_decoded_substream
558 && s->lossless_check_data != 0xffffffff) {
559 tmp = xor_32_to_8(s->lossless_check_data);
560 if (tmp != lossless_check)
561 av_log(m->avctx, AV_LOG_WARNING,
562 "Lossless check failed - expected %02x, calculated %02x.\n",
563 lossless_check, tmp);
568 memset(s->ch_assign, 0, sizeof(s->ch_assign));
570 for (ch = 0; ch <= s->max_matrix_channel; ch++) {
571 int ch_assign = get_bits(gbp, 6);
572 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) {
573 uint64_t channel = thd_channel_layout_extract_channel(s->mask,
575 ch_assign = av_get_channel_layout_channel_index(s->mask,
578 if (ch_assign < 0 || ch_assign > s->max_matrix_channel) {
579 avpriv_request_sample(m->avctx,
580 "Assignment of matrix channel %d to invalid output channel %d",
582 return AVERROR_PATCHWELCOME;
584 s->ch_assign[ch_assign] = ch;
587 checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
589 if (checksum != get_bits(gbp, 8))
590 av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n");
592 /* Set default decoding parameters. */
593 s->param_presence_flags = 0xff;
594 s->num_primitive_matrices = 0;
596 s->lossless_check_data = 0;
598 memset(s->output_shift , 0, sizeof(s->output_shift ));
599 memset(s->quant_step_size, 0, sizeof(s->quant_step_size));
601 for (ch = s->min_channel; ch <= s->max_channel; ch++) {
602 ChannelParams *cp = &s->channel_params[ch];
603 cp->filter_params[FIR].order = 0;
604 cp->filter_params[IIR].order = 0;
605 cp->filter_params[FIR].shift = 0;
606 cp->filter_params[IIR].shift = 0;
608 /* Default audio coding is 24-bit raw PCM. */
610 cp->sign_huff_offset = -(1 << 23);
615 if (substr == m->max_decoded_substream) {
616 m->avctx->channels = s->max_matrix_channel + 1;
617 m->avctx->channel_layout = s->mask;
618 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign,
620 s->max_matrix_channel,
621 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
623 if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) {
624 if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) ||
625 m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) {
626 int i = s->ch_assign[4];
627 s->ch_assign[4] = s->ch_assign[3];
628 s->ch_assign[3] = s->ch_assign[2];
630 } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) {
631 FFSWAP(int, s->ch_assign[2], s->ch_assign[4]);
632 FFSWAP(int, s->ch_assign[3], s->ch_assign[5]);
641 /** Read parameters for one of the prediction filters. */
643 static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
644 unsigned int substr, unsigned int channel,
647 SubStream *s = &m->substream[substr];
648 FilterParams *fp = &s->channel_params[channel].filter_params[filter];
649 const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER;
650 const char fchar = filter ? 'I' : 'F';
653 // Filter is 0 for FIR, 1 for IIR.
654 av_assert0(filter < 2);
656 if (m->filter_changed[channel][filter]++ > 1) {
657 av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n");
658 return AVERROR_INVALIDDATA;
661 order = get_bits(gbp, 4);
662 if (order > max_order) {
663 av_log(m->avctx, AV_LOG_ERROR,
664 "%cIR filter order %d is greater than maximum %d.\n",
665 fchar, order, max_order);
666 return AVERROR_INVALIDDATA;
671 int32_t *fcoeff = s->channel_params[channel].coeff[filter];
672 int coeff_bits, coeff_shift;
674 fp->shift = get_bits(gbp, 4);
676 coeff_bits = get_bits(gbp, 5);
677 coeff_shift = get_bits(gbp, 3);
678 if (coeff_bits < 1 || coeff_bits > 16) {
679 av_log(m->avctx, AV_LOG_ERROR,
680 "%cIR filter coeff_bits must be between 1 and 16.\n",
682 return AVERROR_INVALIDDATA;
684 if (coeff_bits + coeff_shift > 16) {
685 av_log(m->avctx, AV_LOG_ERROR,
686 "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n",
688 return AVERROR_INVALIDDATA;
691 for (i = 0; i < order; i++)
692 fcoeff[i] = get_sbits(gbp, coeff_bits) * (1 << coeff_shift);
694 if (get_bits1(gbp)) {
695 int state_bits, state_shift;
698 av_log(m->avctx, AV_LOG_ERROR,
699 "FIR filter has state data specified.\n");
700 return AVERROR_INVALIDDATA;
703 state_bits = get_bits(gbp, 4);
704 state_shift = get_bits(gbp, 4);
706 /* TODO: Check validity of state data. */
708 for (i = 0; i < order; i++)
709 fp->state[i] = state_bits ? get_sbits(gbp, state_bits) * (1 << state_shift) : 0;
716 /** Read parameters for primitive matrices. */
718 static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp)
720 SubStream *s = &m->substream[substr];
721 unsigned int mat, ch;
722 const int max_primitive_matrices = m->avctx->codec_id == AV_CODEC_ID_MLP
724 : MAX_MATRICES_TRUEHD;
726 if (m->matrix_changed++ > 1) {
727 av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n");
728 return AVERROR_INVALIDDATA;
731 s->num_primitive_matrices = get_bits(gbp, 4);
733 if (s->num_primitive_matrices > max_primitive_matrices) {
734 av_log(m->avctx, AV_LOG_ERROR,
735 "Number of primitive matrices cannot be greater than %d.\n",
736 max_primitive_matrices);
740 for (mat = 0; mat < s->num_primitive_matrices; mat++) {
741 int frac_bits, max_chan;
742 s->matrix_out_ch[mat] = get_bits(gbp, 4);
743 frac_bits = get_bits(gbp, 4);
744 s->lsb_bypass [mat] = get_bits1(gbp);
746 if (s->matrix_out_ch[mat] > s->max_matrix_channel) {
747 av_log(m->avctx, AV_LOG_ERROR,
748 "Invalid channel %d specified as output from matrix.\n",
749 s->matrix_out_ch[mat]);
752 if (frac_bits > 14) {
753 av_log(m->avctx, AV_LOG_ERROR,
754 "Too many fractional bits specified.\n");
758 max_chan = s->max_matrix_channel;
762 for (ch = 0; ch <= max_chan; ch++) {
765 coeff_val = get_sbits(gbp, frac_bits + 2);
767 s->matrix_coeff[mat][ch] = coeff_val * (1 << (14 - frac_bits));
771 s->matrix_noise_shift[mat] = get_bits(gbp, 4);
773 s->matrix_noise_shift[mat] = 0;
778 s->num_primitive_matrices = 0;
779 memset(s->matrix_out_ch, 0, sizeof(s->matrix_out_ch));
781 return AVERROR_INVALIDDATA;
784 /** Read channel parameters. */
786 static int read_channel_params(MLPDecodeContext *m, unsigned int substr,
787 GetBitContext *gbp, unsigned int ch)
789 SubStream *s = &m->substream[substr];
790 ChannelParams *cp = &s->channel_params[ch];
791 FilterParams *fir = &cp->filter_params[FIR];
792 FilterParams *iir = &cp->filter_params[IIR];
795 if (s->param_presence_flags & PARAM_FIR)
797 if ((ret = read_filter_params(m, gbp, substr, ch, FIR)) < 0)
800 if (s->param_presence_flags & PARAM_IIR)
802 if ((ret = read_filter_params(m, gbp, substr, ch, IIR)) < 0)
805 if (fir->order + iir->order > 8) {
806 av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n");
807 return AVERROR_INVALIDDATA;
810 if (fir->order && iir->order &&
811 fir->shift != iir->shift) {
812 av_log(m->avctx, AV_LOG_ERROR,
813 "FIR and IIR filters must use the same precision.\n");
814 return AVERROR_INVALIDDATA;
816 /* The FIR and IIR filters must have the same precision.
817 * To simplify the filtering code, only the precision of the
818 * FIR filter is considered. If only the IIR filter is employed,
819 * the FIR filter precision is set to that of the IIR filter, so
820 * that the filtering code can use it. */
821 if (!fir->order && iir->order)
822 fir->shift = iir->shift;
824 if (s->param_presence_flags & PARAM_HUFFOFFSET)
826 cp->huff_offset = get_sbits(gbp, 15);
828 cp->codebook = get_bits(gbp, 2);
829 cp->huff_lsbs = get_bits(gbp, 5);
831 if (cp->huff_lsbs > 24) {
832 av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n");
834 return AVERROR_INVALIDDATA;
840 /** Read decoding parameters that change more often than those in the restart
843 static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp,
846 SubStream *s = &m->substream[substr];
849 unsigned recompute_sho = 0;
851 if (s->param_presence_flags & PARAM_PRESENCE)
853 s->param_presence_flags = get_bits(gbp, 8);
855 if (s->param_presence_flags & PARAM_BLOCKSIZE)
856 if (get_bits1(gbp)) {
857 s->blocksize = get_bits(gbp, 9);
858 if (s->blocksize < 8 || s->blocksize > m->access_unit_size) {
859 av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n");
861 return AVERROR_INVALIDDATA;
865 if (s->param_presence_flags & PARAM_MATRIX)
867 if ((ret = read_matrix_params(m, substr, gbp)) < 0)
870 if (s->param_presence_flags & PARAM_OUTSHIFT)
871 if (get_bits1(gbp)) {
872 for (ch = 0; ch <= s->max_matrix_channel; ch++) {
873 s->output_shift[ch] = get_sbits(gbp, 4);
874 if (s->output_shift[ch] < 0) {
875 avpriv_request_sample(m->avctx, "Negative output_shift");
876 s->output_shift[ch] = 0;
879 if (substr == m->max_decoded_substream)
880 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign,
882 s->max_matrix_channel,
883 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
886 if (s->param_presence_flags & PARAM_QUANTSTEP)
888 for (ch = 0; ch <= s->max_channel; ch++) {
889 s->quant_step_size[ch] = get_bits(gbp, 4);
891 recompute_sho |= 1<<ch;
894 for (ch = s->min_channel; ch <= s->max_channel; ch++)
895 if (get_bits1(gbp)) {
896 recompute_sho |= 1<<ch;
897 if ((ret = read_channel_params(m, substr, gbp, ch)) < 0)
903 for (ch = 0; ch <= s->max_channel; ch++) {
904 if (recompute_sho & (1<<ch)) {
905 ChannelParams *cp = &s->channel_params[ch];
907 if (cp->codebook > 0 && cp->huff_lsbs < s->quant_step_size[ch]) {
909 av_log(m->avctx, AV_LOG_ERROR, "quant_step_size larger than huff_lsbs\n");
910 ret = AVERROR_INVALIDDATA;
912 s->quant_step_size[ch] = 0;
915 cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
921 #define MSB_MASK(bits) (-1u << (bits))
923 /** Generate PCM samples using the prediction filters and residual values
924 * read from the data stream, and update the filter state. */
926 static void filter_channel(MLPDecodeContext *m, unsigned int substr,
927 unsigned int channel)
929 SubStream *s = &m->substream[substr];
930 const int32_t *fircoeff = s->channel_params[channel].coeff[FIR];
931 int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER];
932 int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE;
933 int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE;
934 FilterParams *fir = &s->channel_params[channel].filter_params[FIR];
935 FilterParams *iir = &s->channel_params[channel].filter_params[IIR];
936 unsigned int filter_shift = fir->shift;
937 int32_t mask = MSB_MASK(s->quant_step_size[channel]);
939 memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t));
940 memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t));
942 m->dsp.mlp_filter_channel(firbuf, fircoeff,
943 fir->order, iir->order,
944 filter_shift, mask, s->blocksize,
945 &m->sample_buffer[s->blockpos][channel]);
947 memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t));
948 memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t));
951 /** Read a block of PCM residual data (or actual if no filtering active). */
953 static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp,
956 SubStream *s = &m->substream[substr];
957 unsigned int i, ch, expected_stream_pos = 0;
960 if (s->data_check_present) {
961 expected_stream_pos = get_bits_count(gbp);
962 expected_stream_pos += get_bits(gbp, 16);
963 avpriv_request_sample(m->avctx,
964 "Substreams with VLC block size check info");
967 if (s->blockpos + s->blocksize > m->access_unit_size) {
968 av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n");
969 return AVERROR_INVALIDDATA;
972 memset(&m->bypassed_lsbs[s->blockpos][0], 0,
973 s->blocksize * sizeof(m->bypassed_lsbs[0]));
975 for (i = 0; i < s->blocksize; i++)
976 if ((ret = read_huff_channels(m, gbp, substr, i)) < 0)
979 for (ch = s->min_channel; ch <= s->max_channel; ch++)
980 filter_channel(m, substr, ch);
982 s->blockpos += s->blocksize;
984 if (s->data_check_present) {
985 if (get_bits_count(gbp) != expected_stream_pos)
986 av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n");
993 /** Data table used for TrueHD noise generation function. */
995 static const int8_t noise_table[256] = {
996 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2,
997 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62,
998 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5,
999 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40,
1000 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34,
1001 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30,
1002 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36,
1003 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69,
1004 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24,
1005 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20,
1006 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23,
1007 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8,
1008 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40,
1009 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37,
1010 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52,
1011 -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70,
1014 /** Noise generation functions.
1015 * I'm not sure what these are for - they seem to be some kind of pseudorandom
1016 * sequence generators, used to generate noise data which is used when the
1017 * channels are rematrixed. I'm not sure if they provide a practical benefit
1018 * to compression, or just obfuscate the decoder. Are they for some kind of
1021 /** Generate two channels of noise, used in the matrix when
1022 * restart sync word == 0x31ea. */
1024 static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr)
1026 SubStream *s = &m->substream[substr];
1028 uint32_t seed = s->noisegen_seed;
1029 unsigned int maxchan = s->max_matrix_channel;
1031 for (i = 0; i < s->blockpos; i++) {
1032 uint16_t seed_shr7 = seed >> 7;
1033 m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) * (1 << s->noise_shift);
1034 m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) * (1 << s->noise_shift);
1036 seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5);
1039 s->noisegen_seed = seed;
1042 /** Generate a block of noise, used when restart sync word == 0x31eb. */
1044 static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr)
1046 SubStream *s = &m->substream[substr];
1048 uint32_t seed = s->noisegen_seed;
1050 for (i = 0; i < m->access_unit_size_pow2; i++) {
1051 uint8_t seed_shr15 = seed >> 15;
1052 m->noise_buffer[i] = noise_table[seed_shr15];
1053 seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5);
1056 s->noisegen_seed = seed;
1059 /** Write the audio data into the output buffer. */
1061 static int output_data(MLPDecodeContext *m, unsigned int substr,
1062 AVFrame *frame, int *got_frame_ptr)
1064 AVCodecContext *avctx = m->avctx;
1065 SubStream *s = &m->substream[substr];
1067 unsigned int maxchan;
1069 int is32 = (m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
1071 if (m->avctx->channels != s->max_matrix_channel + 1) {
1072 av_log(m->avctx, AV_LOG_ERROR, "channel count mismatch\n");
1073 return AVERROR_INVALIDDATA;
1077 av_log(avctx, AV_LOG_ERROR, "No samples to output.\n");
1078 return AVERROR_INVALIDDATA;
1081 maxchan = s->max_matrix_channel;
1082 if (!s->noise_type) {
1083 generate_2_noise_channels(m, substr);
1086 fill_noise_buffer(m, substr);
1089 /* Apply the channel matrices in turn to reconstruct the original audio
1091 for (mat = 0; mat < s->num_primitive_matrices; mat++) {
1092 unsigned int dest_ch = s->matrix_out_ch[mat];
1093 m->dsp.mlp_rematrix_channel(&m->sample_buffer[0][0],
1094 s->matrix_coeff[mat],
1095 &m->bypassed_lsbs[0][mat],
1097 s->num_primitive_matrices - mat,
1101 s->matrix_noise_shift[mat],
1102 m->access_unit_size_pow2,
1103 MSB_MASK(s->quant_step_size[dest_ch]));
1106 /* get output buffer */
1107 frame->nb_samples = s->blockpos;
1108 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1110 s->lossless_check_data = m->dsp.mlp_pack_output(s->lossless_check_data,
1116 s->max_matrix_channel,
1119 /* Update matrix encoding side data */
1120 if ((ret = ff_side_data_update_matrix_encoding(frame, s->matrix_encoding)) < 0)
1128 /** Read an access unit from the stream.
1129 * @return negative on error, 0 if not enough data is present in the input stream,
1130 * otherwise the number of bytes consumed. */
1132 static int read_access_unit(AVCodecContext *avctx, void* data,
1133 int *got_frame_ptr, AVPacket *avpkt)
1135 const uint8_t *buf = avpkt->data;
1136 int buf_size = avpkt->size;
1137 MLPDecodeContext *m = avctx->priv_data;
1139 unsigned int length, substr;
1140 unsigned int substream_start;
1141 unsigned int header_size = 4;
1142 unsigned int substr_header_size = 0;
1143 uint8_t substream_parity_present[MAX_SUBSTREAMS];
1144 uint16_t substream_data_len[MAX_SUBSTREAMS];
1145 uint8_t parity_bits;
1149 return AVERROR_INVALIDDATA;
1151 length = (AV_RB16(buf) & 0xfff) * 2;
1153 if (length < 4 || length > buf_size)
1154 return AVERROR_INVALIDDATA;
1156 init_get_bits(&gb, (buf + 4), (length - 4) * 8);
1158 m->is_major_sync_unit = 0;
1159 if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) {
1160 if (read_major_sync(m, &gb) < 0)
1162 m->is_major_sync_unit = 1;
1163 header_size += m->major_sync_header_size;
1166 if (!m->params_valid) {
1167 av_log(m->avctx, AV_LOG_WARNING,
1168 "Stream parameters not seen; skipping frame.\n");
1173 substream_start = 0;
1175 for (substr = 0; substr < m->num_substreams; substr++) {
1176 int extraword_present, checkdata_present, end, nonrestart_substr;
1178 extraword_present = get_bits1(&gb);
1179 nonrestart_substr = get_bits1(&gb);
1180 checkdata_present = get_bits1(&gb);
1183 end = get_bits(&gb, 12) * 2;
1185 substr_header_size += 2;
1187 if (extraword_present) {
1188 if (m->avctx->codec_id == AV_CODEC_ID_MLP) {
1189 av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n");
1193 substr_header_size += 2;
1196 if (length < header_size + substr_header_size) {
1197 av_log(m->avctx, AV_LOG_ERROR, "Insuffient data for headers\n");
1201 if (!(nonrestart_substr ^ m->is_major_sync_unit)) {
1202 av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n");
1206 if (end + header_size + substr_header_size > length) {
1207 av_log(m->avctx, AV_LOG_ERROR,
1208 "Indicated length of substream %d data goes off end of "
1209 "packet.\n", substr);
1210 end = length - header_size - substr_header_size;
1213 if (end < substream_start) {
1214 av_log(avctx, AV_LOG_ERROR,
1215 "Indicated end offset of substream %d data "
1216 "is smaller than calculated start offset.\n",
1221 if (substr > m->max_decoded_substream)
1224 substream_parity_present[substr] = checkdata_present;
1225 substream_data_len[substr] = end - substream_start;
1226 substream_start = end;
1229 parity_bits = ff_mlp_calculate_parity(buf, 4);
1230 parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size);
1232 if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
1233 av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n");
1237 buf += header_size + substr_header_size;
1239 for (substr = 0; substr <= m->max_decoded_substream; substr++) {
1240 SubStream *s = &m->substream[substr];
1241 init_get_bits(&gb, buf, substream_data_len[substr] * 8);
1243 m->matrix_changed = 0;
1244 memset(m->filter_changed, 0, sizeof(m->filter_changed));
1248 if (get_bits1(&gb)) {
1249 if (get_bits1(&gb)) {
1250 /* A restart header should be present. */
1251 if (read_restart_header(m, &gb, buf, substr) < 0)
1253 s->restart_seen = 1;
1256 if (!s->restart_seen)
1258 if (read_decoding_params(m, &gb, substr) < 0)
1262 if (!s->restart_seen)
1265 if ((ret = read_block_data(m, &gb, substr)) < 0)
1268 if (get_bits_count(&gb) >= substream_data_len[substr] * 8)
1269 goto substream_length_mismatch;
1271 } while (!get_bits1(&gb));
1273 skip_bits(&gb, (-get_bits_count(&gb)) & 15);
1275 if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) {
1278 if (get_bits(&gb, 16) != 0xD234)
1279 return AVERROR_INVALIDDATA;
1281 shorten_by = get_bits(&gb, 16);
1282 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD && shorten_by & 0x2000)
1283 s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos);
1284 else if (m->avctx->codec_id == AV_CODEC_ID_MLP && shorten_by != 0xD234)
1285 return AVERROR_INVALIDDATA;
1287 if (substr == m->max_decoded_substream)
1288 av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n");
1291 if (substream_parity_present[substr]) {
1292 uint8_t parity, checksum;
1294 if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16)
1295 goto substream_length_mismatch;
1297 parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2);
1298 checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2);
1300 if ((get_bits(&gb, 8) ^ parity) != 0xa9 )
1301 av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr);
1302 if ( get_bits(&gb, 8) != checksum)
1303 av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr);
1306 if (substream_data_len[substr] * 8 != get_bits_count(&gb))
1307 goto substream_length_mismatch;
1310 if (!s->restart_seen)
1311 av_log(m->avctx, AV_LOG_ERROR,
1312 "No restart header present in substream %d.\n", substr);
1314 buf += substream_data_len[substr];
1317 if ((ret = output_data(m, m->max_decoded_substream, data, got_frame_ptr)) < 0)
1322 substream_length_mismatch:
1323 av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr);
1324 return AVERROR_INVALIDDATA;
1327 m->params_valid = 0;
1328 return AVERROR_INVALIDDATA;
1331 #if CONFIG_MLP_DECODER
1332 AVCodec ff_mlp_decoder = {
1334 .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"),
1335 .type = AVMEDIA_TYPE_AUDIO,
1336 .id = AV_CODEC_ID_MLP,
1337 .priv_data_size = sizeof(MLPDecodeContext),
1338 .init = mlp_decode_init,
1339 .decode = read_access_unit,
1340 .capabilities = AV_CODEC_CAP_DR1,
1343 #if CONFIG_TRUEHD_DECODER
1344 AVCodec ff_truehd_decoder = {
1346 .long_name = NULL_IF_CONFIG_SMALL("TrueHD"),
1347 .type = AVMEDIA_TYPE_AUDIO,
1348 .id = AV_CODEC_ID_TRUEHD,
1349 .priv_data_size = sizeof(MLPDecodeContext),
1350 .init = mlp_decode_init,
1351 .decode = read_access_unit,
1352 .capabilities = AV_CODEC_CAP_DR1,
1354 #endif /* CONFIG_TRUEHD_DECODER */