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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / mlpdec.c
CommitLineData
2ba45a60
DM		 1/*
2 * MLP decoder
3 * Copyright (c) 2007-2008 Ian Caulfield
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22/**
23 * @file
24 * MLP decoder
25 */
26
27#include <stdint.h>
28
29#include "avcodec.h"
30#include "libavutil/internal.h"
31#include "libavutil/intreadwrite.h"
32#include "libavutil/channel_layout.h"
33#include "get_bits.h"
34#include "internal.h"
35#include "libavutil/crc.h"
36#include "parser.h"
37#include "mlp_parser.h"
38#include "mlpdsp.h"
39#include "mlp.h"
40#include "config.h"
41
42/** number of bits used for VLC lookup - longest Huffman code is 9 */
43#if ARCH_ARM
44#define VLC_BITS 5
45#define VLC_STATIC_SIZE 64
46#else
47#define VLC_BITS 9
48#define VLC_STATIC_SIZE 512
49#endif
50
51typedef struct SubStream {
52 /// Set if a valid restart header has been read. Otherwise the substream cannot be decoded.
53 uint8_t restart_seen;
54
55 //@{
56 /** restart header data */
57 /// The type of noise to be used in the rematrix stage.
58 uint16_t noise_type;
59
60 /// The index of the first channel coded in this substream.
61 uint8_t min_channel;
62 /// The index of the last channel coded in this substream.
63 uint8_t max_channel;
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
69 uint64_t ch_layout;
70 /// The matrix encoding mode for this substream
71 enum AVMatrixEncoding matrix_encoding;
72
73 /// Channel coding parameters for channels in the substream
74 ChannelParams channel_params[MAX_CHANNELS];
75
76 /// The left shift applied to random noise in 0x31ea substreams.
77 uint8_t noise_shift;
78 /// The current seed value for the pseudorandom noise generator(s).
79 uint32_t noisegen_seed;
80
81 /// Set if the substream contains extra info to check the size of VLC blocks.
82 uint8_t data_check_present;
83
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)
94 //@}
95
96 //@{
97 /** matrix data */
98
99 /// Number of matrices to be applied.
100 uint8_t num_primitive_matrices;
101
102 /// matrix output channel
103 uint8_t matrix_out_ch[MAX_MATRICES];
104
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.
f6fa7814 108 DECLARE_ALIGNED(32, int32_t, matrix_coeff)[MAX_MATRICES][MAX_CHANNELS];
2ba45a60
DM		 109 /// Left shift to apply to noise values in 0x31eb substreams.
110 uint8_t matrix_noise_shift[MAX_MATRICES];
111 //@}
112
113 /// Left shift to apply to Huffman-decoded residuals.
114 uint8_t quant_step_size[MAX_CHANNELS];
115
116 /// number of PCM samples in current audio block
117 uint16_t blocksize;
118 /// Number of PCM samples decoded so far in this frame.
119 uint16_t blockpos;
120
121 /// Left shift to apply to decoded PCM values to get final 24-bit output.
122 int8_t output_shift[MAX_CHANNELS];
123
124 /// Running XOR of all output samples.
125 int32_t lossless_check_data;
126
127} SubStream;
128
129typedef struct MLPDecodeContext {
130 AVCodecContext *avctx;
131
132 /// Current access unit being read has a major sync.
133 int is_major_sync_unit;
134
f6fa7814
DM		 135 /// Size of the major sync unit, in bytes
136 int major_sync_header_size;
137
2ba45a60
DM		 138 /// Set if a valid major sync block has been read. Otherwise no decoding is possible.
139 uint8_t params_valid;
140
141 /// Number of substreams contained within this stream.
142 uint8_t num_substreams;
143
144 /// Index of the last substream to decode - further substreams are skipped.
145 uint8_t max_decoded_substream;
146
147 /// Stream needs channel reordering to comply with FFmpeg's channel order
148 uint8_t needs_reordering;
149
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;
154
155 SubStream substream[MAX_SUBSTREAMS];
156
157 int matrix_changed;
158 int filter_changed[MAX_CHANNELS][NUM_FILTERS];
159
160 int8_t noise_buffer[MAX_BLOCKSIZE_POW2];
161 int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS];
f6fa7814 162 DECLARE_ALIGNED(32, int32_t, sample_buffer)[MAX_BLOCKSIZE][MAX_CHANNELS];
2ba45a60
DM		 163
164 MLPDSPContext dsp;
165} MLPDecodeContext;
166
167static 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
181};
182
183static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout,
184 int index)
185{
186 int i;
187
188 if (av_get_channel_layout_nb_channels(channel_layout) <= index)
189 return 0;
190
191 for (i = 0; i < FF_ARRAY_ELEMS(thd_channel_order); i++)
192 if (channel_layout & thd_channel_order[i] && !index--)
193 return thd_channel_order[i];
194 return 0;
195}
196
197static VLC huff_vlc[3];
198
199/** Initialize static data, constant between all invocations of the codec. */
200
201static av_cold void init_static(void)
202{
203 if (!huff_vlc[0].bits) {
204 INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
205 &ff_mlp_huffman_tables[0][0][1], 2, 1,
206 &ff_mlp_huffman_tables[0][0][0], 2, 1, VLC_STATIC_SIZE);
207 INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
208 &ff_mlp_huffman_tables[1][0][1], 2, 1,
209 &ff_mlp_huffman_tables[1][0][0], 2, 1, VLC_STATIC_SIZE);
210 INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
211 &ff_mlp_huffman_tables[2][0][1], 2, 1,
212 &ff_mlp_huffman_tables[2][0][0], 2, 1, VLC_STATIC_SIZE);
213 }
214
215 ff_mlp_init_crc();
216}
217
218static inline int32_t calculate_sign_huff(MLPDecodeContext *m,
219 unsigned int substr, unsigned int ch)
220{
221 SubStream *s = &m->substream[substr];
222 ChannelParams *cp = &s->channel_params[ch];
223 int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch];
224 int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1);
225 int32_t sign_huff_offset = cp->huff_offset;
226
227 if (cp->codebook > 0)
228 sign_huff_offset -= 7 << lsb_bits;
229
230 if (sign_shift >= 0)
231 sign_huff_offset -= 1 << sign_shift;
232
233 return sign_huff_offset;
234}
235
236/** Read a sample, consisting of either, both or neither of entropy-coded MSBs
237 * and plain LSBs. */
238
239static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
240 unsigned int substr, unsigned int pos)
241{
242 SubStream *s = &m->substream[substr];
243 unsigned int mat, channel;
244
245 for (mat = 0; mat < s->num_primitive_matrices; mat++)
246 if (s->lsb_bypass[mat])
247 m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp);
248
249 for (channel = s->min_channel; channel <= s->max_channel; channel++) {
250 ChannelParams *cp = &s->channel_params[channel];
251 int codebook = cp->codebook;
252 int quant_step_size = s->quant_step_size[channel];
253 int lsb_bits = cp->huff_lsbs - quant_step_size;
254 int result = 0;
255
256 if (codebook > 0)
257 result = get_vlc2(gbp, huff_vlc[codebook-1].table,
258 VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS);
259
260 if (result < 0)
261 return AVERROR_INVALIDDATA;
262
263 if (lsb_bits > 0)
264 result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
265
266 result += cp->sign_huff_offset;
267 result <<= quant_step_size;
268
269 m->sample_buffer[pos + s->blockpos][channel] = result;
270 }
271
272 return 0;
273}
274
275static av_cold int mlp_decode_init(AVCodecContext *avctx)
276{
277 MLPDecodeContext *m = avctx->priv_data;
278 int substr;
279
280 init_static();
281 m->avctx = avctx;
282 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
283 m->substream[substr].lossless_check_data = 0xffffffff;
284 ff_mlpdsp_init(&m->dsp);
285
286 return 0;
287}
288
289/** Read a major sync info header - contains high level information about
290 * the stream - sample rate, channel arrangement etc. Most of this
291 * information is not actually necessary for decoding, only for playback.
292 */
293
294static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
295{
296 MLPHeaderInfo mh;
297 int substr, ret;
298
299 if ((ret = ff_mlp_read_major_sync(m->avctx, &mh, gb)) != 0)
300 return ret;
301
302 if (mh.group1_bits == 0) {
303 av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n");
304 return AVERROR_INVALIDDATA;
305 }
306 if (mh.group2_bits > mh.group1_bits) {
307 av_log(m->avctx, AV_LOG_ERROR,
308 "Channel group 2 cannot have more bits per sample than group 1.\n");
309 return AVERROR_INVALIDDATA;
310 }
311
312 if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) {
313 av_log(m->avctx, AV_LOG_ERROR,
314 "Channel groups with differing sample rates are not currently supported.\n");
315 return AVERROR_INVALIDDATA;
316 }
317
318 if (mh.group1_samplerate == 0) {
319 av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n");
320 return AVERROR_INVALIDDATA;
321 }
322 if (mh.group1_samplerate > MAX_SAMPLERATE) {
323 av_log(m->avctx, AV_LOG_ERROR,
324 "Sampling rate %d is greater than the supported maximum (%d).\n",
325 mh.group1_samplerate, MAX_SAMPLERATE);
326 return AVERROR_INVALIDDATA;
327 }
328 if (mh.access_unit_size > MAX_BLOCKSIZE) {
329 av_log(m->avctx, AV_LOG_ERROR,
330 "Block size %d is greater than the supported maximum (%d).\n",
331 mh.access_unit_size, MAX_BLOCKSIZE);
332 return AVERROR_INVALIDDATA;
333 }
334 if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) {
335 av_log(m->avctx, AV_LOG_ERROR,
336 "Block size pow2 %d is greater than the supported maximum (%d).\n",
337 mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2);
338 return AVERROR_INVALIDDATA;
339 }
340
341 if (mh.num_substreams == 0)
342 return AVERROR_INVALIDDATA;
343 if (m->avctx->codec_id == AV_CODEC_ID_MLP && mh.num_substreams > 2) {
344 av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n");
345 return AVERROR_INVALIDDATA;
346 }
347 if (mh.num_substreams > MAX_SUBSTREAMS) {
348 avpriv_request_sample(m->avctx,
349 "%d substreams (more than the "
350 "maximum supported by the decoder)",
351 mh.num_substreams);
352 return AVERROR_PATCHWELCOME;
353 }
354
f6fa7814
DM		 355 m->major_sync_header_size = mh.header_size;
356
2ba45a60
DM		 357 m->access_unit_size = mh.access_unit_size;
358 m->access_unit_size_pow2 = mh.access_unit_size_pow2;
359
360 m->num_substreams = mh.num_substreams;
f6fa7814
DM		 361
362 /* limit to decoding 3 substreams, as the 4th is used by Dolby Atmos for non-audio data */
363 m->max_decoded_substream = FFMIN(m->num_substreams - 1, 2);
2ba45a60
DM		 364
365 m->avctx->sample_rate = mh.group1_samplerate;
366 m->avctx->frame_size = mh.access_unit_size;
367
368 m->avctx->bits_per_raw_sample = mh.group1_bits;
369 if (mh.group1_bits > 16)
370 m->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
371 else
372 m->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
373 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(m->substream[m->max_decoded_substream].ch_assign,
374 m->substream[m->max_decoded_substream].output_shift,
375 m->substream[m->max_decoded_substream].max_matrix_channel,
376 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
377
378 m->params_valid = 1;
379 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
380 m->substream[substr].restart_seen = 0;
381
382 /* Set the layout for each substream. When there's more than one, the first
383 * substream is Stereo. Subsequent substreams' layouts are indicated in the
384 * major sync. */
385 if (m->avctx->codec_id == AV_CODEC_ID_MLP) {
386 if (mh.stream_type != 0xbb) {
387 avpriv_request_sample(m->avctx,
388 "unexpected stream_type %X in MLP",
389 mh.stream_type);
390 return AVERROR_PATCHWELCOME;
391 }
392 if ((substr = (mh.num_substreams > 1)))
393 m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO;
394 m->substream[substr].ch_layout = mh.channel_layout_mlp;
395 } else {
396 if (mh.stream_type != 0xba) {
397 avpriv_request_sample(m->avctx,
398 "unexpected stream_type %X in !MLP",
399 mh.stream_type);
400 return AVERROR_PATCHWELCOME;
401 }
402 if ((substr = (mh.num_substreams > 1)))
403 m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO;
404 if (mh.num_substreams > 2)
405 if (mh.channel_layout_thd_stream2)
406 m->substream[2].ch_layout = mh.channel_layout_thd_stream2;
407 else
408 m->substream[2].ch_layout = mh.channel_layout_thd_stream1;
409 m->substream[substr].ch_layout = mh.channel_layout_thd_stream1;
410
411 if (m->avctx->channels<=2 && m->substream[substr].ch_layout == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) {
412 av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n");
413 m->max_decoded_substream = 0;
414 if (m->avctx->channels==2)
415 m->avctx->channel_layout = AV_CH_LAYOUT_STEREO;
416 }
417 }
418
419 m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20;
420
421 /* Parse the TrueHD decoder channel modifiers and set each substream's
422 * AVMatrixEncoding accordingly.
423 *
424 * The meaning of the modifiers depends on the channel layout:
425 *
426 * - THD_CH_MODIFIER_LTRT, THD_CH_MODIFIER_LBINRBIN only apply to 2-channel
427 *
428 * - THD_CH_MODIFIER_MONO applies to 1-channel or 2-channel (dual mono)
429 *
430 * - THD_CH_MODIFIER_SURROUNDEX, THD_CH_MODIFIER_NOTSURROUNDEX only apply to
431 * layouts with an Ls/Rs channel pair
432 */
433 for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
434 m->substream[substr].matrix_encoding = AV_MATRIX_ENCODING_NONE;
435 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) {
436 if (mh.num_substreams > 2 &&
437 mh.channel_layout_thd_stream2 & AV_CH_SIDE_LEFT &&
438 mh.channel_layout_thd_stream2 & AV_CH_SIDE_RIGHT &&
439 mh.channel_modifier_thd_stream2 == THD_CH_MODIFIER_SURROUNDEX)
440 m->substream[2].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
441
442 if (mh.num_substreams > 1 &&
443 mh.channel_layout_thd_stream1 & AV_CH_SIDE_LEFT &&
444 mh.channel_layout_thd_stream1 & AV_CH_SIDE_RIGHT &&
445 mh.channel_modifier_thd_stream1 == THD_CH_MODIFIER_SURROUNDEX)
446 m->substream[1].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
447
448 if (mh.num_substreams > 0)
449 switch (mh.channel_modifier_thd_stream0) {
450 case THD_CH_MODIFIER_LTRT:
451 m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
452 break;
453 case THD_CH_MODIFIER_LBINRBIN:
454 m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
455 break;
456 default:
457 break;
458 }
459 }
460
461 return 0;
462}
463
464/** Read a restart header from a block in a substream. This contains parameters
465 * required to decode the audio that do not change very often. Generally
466 * (always) present only in blocks following a major sync. */
467
468static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
469 const uint8_t *buf, unsigned int substr)
470{
471 SubStream *s = &m->substream[substr];
472 unsigned int ch;
473 int sync_word, tmp;
474 uint8_t checksum;
475 uint8_t lossless_check;
476 int start_count = get_bits_count(gbp);
477 int min_channel, max_channel, max_matrix_channel;
478 const int std_max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP
479 ? MAX_MATRIX_CHANNEL_MLP
480 : MAX_MATRIX_CHANNEL_TRUEHD;
481
482 sync_word = get_bits(gbp, 13);
483
484 if (sync_word != 0x31ea >> 1) {
485 av_log(m->avctx, AV_LOG_ERROR,
486 "restart header sync incorrect (got 0x%04x)\n", sync_word);
487 return AVERROR_INVALIDDATA;
488 }
489
490 s->noise_type = get_bits1(gbp);
491
492 if (m->avctx->codec_id == AV_CODEC_ID_MLP && s->noise_type) {
493 av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n");
494 return AVERROR_INVALIDDATA;
495 }
496
497 skip_bits(gbp, 16); /* Output timestamp */
498
499 min_channel = get_bits(gbp, 4);
500 max_channel = get_bits(gbp, 4);
501 max_matrix_channel = get_bits(gbp, 4);
502
503 if (max_matrix_channel > std_max_matrix_channel) {
504 av_log(m->avctx, AV_LOG_ERROR,
505 "Max matrix channel cannot be greater than %d.\n",
506 std_max_matrix_channel);
507 return AVERROR_INVALIDDATA;
508 }
509
510 if (max_channel != max_matrix_channel) {
511 av_log(m->avctx, AV_LOG_ERROR,
512 "Max channel must be equal max matrix channel.\n");
513 return AVERROR_INVALIDDATA;
514 }
515
516 /* This should happen for TrueHD streams with >6 channels and MLP's noise
517 * type. It is not yet known if this is allowed. */
518 if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) {
519 avpriv_request_sample(m->avctx,
520 "%d channels (more than the "
521 "maximum supported by the decoder)",
522 max_channel + 2);
523 return AVERROR_PATCHWELCOME;
524 }
525
526 if (min_channel > max_channel) {
527 av_log(m->avctx, AV_LOG_ERROR,
528 "Substream min channel cannot be greater than max channel.\n");
529 return AVERROR_INVALIDDATA;
530 }
531
532 s->min_channel = min_channel;
533 s->max_channel = max_channel;
534 s->max_matrix_channel = max_matrix_channel;
535
536#if FF_API_REQUEST_CHANNELS
537FF_DISABLE_DEPRECATION_WARNINGS
538 if (m->avctx->request_channels > 0 &&
539 m->avctx->request_channels <= s->max_channel + 1 &&
540 m->max_decoded_substream > substr) {
541 av_log(m->avctx, AV_LOG_DEBUG,
542 "Extracting %d-channel downmix from substream %d. "
543 "Further substreams will be skipped.\n",
544 s->max_channel + 1, substr);
545 m->max_decoded_substream = substr;
546FF_ENABLE_DEPRECATION_WARNINGS
547 } else
548#endif
549 if (m->avctx->request_channel_layout && (s->ch_layout & m->avctx->request_channel_layout) ==
550 m->avctx->request_channel_layout && m->max_decoded_substream > substr) {
551 av_log(m->avctx, AV_LOG_DEBUG,
552 "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. "
553 "Further substreams will be skipped.\n",
554 s->max_channel + 1, s->ch_layout, substr);
555 m->max_decoded_substream = substr;
556 }
557
558 s->noise_shift = get_bits(gbp, 4);
559 s->noisegen_seed = get_bits(gbp, 23);
560
561 skip_bits(gbp, 19);
562
563 s->data_check_present = get_bits1(gbp);
564 lossless_check = get_bits(gbp, 8);
565 if (substr == m->max_decoded_substream
566 && s->lossless_check_data != 0xffffffff) {
567 tmp = xor_32_to_8(s->lossless_check_data);
568 if (tmp != lossless_check)
569 av_log(m->avctx, AV_LOG_WARNING,
570 "Lossless check failed - expected %02x, calculated %02x.\n",
571 lossless_check, tmp);
572 }
573
574 skip_bits(gbp, 16);
575
576 memset(s->ch_assign, 0, sizeof(s->ch_assign));
577
578 for (ch = 0; ch <= s->max_matrix_channel; ch++) {
579 int ch_assign = get_bits(gbp, 6);
580 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) {
581 uint64_t channel = thd_channel_layout_extract_channel(s->ch_layout,
582 ch_assign);
583 ch_assign = av_get_channel_layout_channel_index(s->ch_layout,
584 channel);
585 }
f6fa7814 586 if (ch_assign < 0 || ch_assign > s->max_matrix_channel) {
2ba45a60
DM		 587 avpriv_request_sample(m->avctx,
588 "Assignment of matrix channel %d to invalid output channel %d",
589 ch, ch_assign);
590 return AVERROR_PATCHWELCOME;
591 }
592 s->ch_assign[ch_assign] = ch;
593 }
594
595 checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
596
597 if (checksum != get_bits(gbp, 8))
598 av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n");
599
600 /* Set default decoding parameters. */
601 s->param_presence_flags = 0xff;
602 s->num_primitive_matrices = 0;
603 s->blocksize = 8;
604 s->lossless_check_data = 0;
605
606 memset(s->output_shift , 0, sizeof(s->output_shift ));
607 memset(s->quant_step_size, 0, sizeof(s->quant_step_size));
608
609 for (ch = s->min_channel; ch <= s->max_channel; ch++) {
610 ChannelParams *cp = &s->channel_params[ch];
611 cp->filter_params[FIR].order = 0;
612 cp->filter_params[IIR].order = 0;
613 cp->filter_params[FIR].shift = 0;
614 cp->filter_params[IIR].shift = 0;
615
616 /* Default audio coding is 24-bit raw PCM. */
617 cp->huff_offset = 0;
618 cp->sign_huff_offset = (-1) << 23;
619 cp->codebook = 0;
620 cp->huff_lsbs = 24;
621 }
622
623 if (substr == m->max_decoded_substream) {
624 m->avctx->channels = s->max_matrix_channel + 1;
625 m->avctx->channel_layout = s->ch_layout;
626 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign,
627 s->output_shift,
628 s->max_matrix_channel,
629 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
630
631 if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) {
632 if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) ||
633 m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) {
634 int i = s->ch_assign[4];
635 s->ch_assign[4] = s->ch_assign[3];
636 s->ch_assign[3] = s->ch_assign[2];
637 s->ch_assign[2] = i;
638 } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) {
639 FFSWAP(int, s->ch_assign[2], s->ch_assign[4]);
640 FFSWAP(int, s->ch_assign[3], s->ch_assign[5]);
641 }
642 }
643
644 }
645
646 return 0;
647}
648
649/** Read parameters for one of the prediction filters. */
650
651static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
652 unsigned int substr, unsigned int channel,
653 unsigned int filter)
654{
655 SubStream *s = &m->substream[substr];
656 FilterParams *fp = &s->channel_params[channel].filter_params[filter];
657 const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER;
658 const char fchar = filter ? 'I' : 'F';
659 int i, order;
660
661 // Filter is 0 for FIR, 1 for IIR.
662 av_assert0(filter < 2);
663
664 if (m->filter_changed[channel][filter]++ > 1) {
665 av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n");
666 return AVERROR_INVALIDDATA;
667 }
668
669 order = get_bits(gbp, 4);
670 if (order > max_order) {
671 av_log(m->avctx, AV_LOG_ERROR,
672 "%cIR filter order %d is greater than maximum %d.\n",
673 fchar, order, max_order);
674 return AVERROR_INVALIDDATA;
675 }
676 fp->order = order;
677
678 if (order > 0) {
679 int32_t *fcoeff = s->channel_params[channel].coeff[filter];
680 int coeff_bits, coeff_shift;
681
682 fp->shift = get_bits(gbp, 4);
683
684 coeff_bits = get_bits(gbp, 5);
685 coeff_shift = get_bits(gbp, 3);
686 if (coeff_bits < 1 || coeff_bits > 16) {
687 av_log(m->avctx, AV_LOG_ERROR,
688 "%cIR filter coeff_bits must be between 1 and 16.\n",
689 fchar);
690 return AVERROR_INVALIDDATA;
691 }
692 if (coeff_bits + coeff_shift > 16) {
693 av_log(m->avctx, AV_LOG_ERROR,
694 "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n",
695 fchar);
696 return AVERROR_INVALIDDATA;
697 }
698
699 for (i = 0; i < order; i++)
700 fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift;
701
702 if (get_bits1(gbp)) {
703 int state_bits, state_shift;
704
705 if (filter == FIR) {
706 av_log(m->avctx, AV_LOG_ERROR,
707 "FIR filter has state data specified.\n");
708 return AVERROR_INVALIDDATA;
709 }
710
711 state_bits = get_bits(gbp, 4);
712 state_shift = get_bits(gbp, 4);
713
714 /* TODO: Check validity of state data. */
715
716 for (i = 0; i < order; i++)
717 fp->state[i] = state_bits ? get_sbits(gbp, state_bits) << state_shift : 0;
718 }
719 }
720
721 return 0;
722}
723
724/** Read parameters for primitive matrices. */
725
726static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp)
727{
728 SubStream *s = &m->substream[substr];
729 unsigned int mat, ch;
730 const int max_primitive_matrices = m->avctx->codec_id == AV_CODEC_ID_MLP
731 ? MAX_MATRICES_MLP
732 : MAX_MATRICES_TRUEHD;
733
734 if (m->matrix_changed++ > 1) {
735 av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n");
736 return AVERROR_INVALIDDATA;
737 }
738
739 s->num_primitive_matrices = get_bits(gbp, 4);
740
741 if (s->num_primitive_matrices > max_primitive_matrices) {
742 av_log(m->avctx, AV_LOG_ERROR,
743 "Number of primitive matrices cannot be greater than %d.\n",
744 max_primitive_matrices);
745 return AVERROR_INVALIDDATA;
746 }
747
748 for (mat = 0; mat < s->num_primitive_matrices; mat++) {
749 int frac_bits, max_chan;
750 s->matrix_out_ch[mat] = get_bits(gbp, 4);
751 frac_bits = get_bits(gbp, 4);
752 s->lsb_bypass [mat] = get_bits1(gbp);
753
754 if (s->matrix_out_ch[mat] > s->max_matrix_channel) {
755 av_log(m->avctx, AV_LOG_ERROR,
756 "Invalid channel %d specified as output from matrix.\n",
757 s->matrix_out_ch[mat]);
758 return AVERROR_INVALIDDATA;
759 }
760 if (frac_bits > 14) {
761 av_log(m->avctx, AV_LOG_ERROR,
762 "Too many fractional bits specified.\n");
763 return AVERROR_INVALIDDATA;
764 }
765
766 max_chan = s->max_matrix_channel;
767 if (!s->noise_type)
768 max_chan+=2;
769
770 for (ch = 0; ch <= max_chan; ch++) {
771 int coeff_val = 0;
772 if (get_bits1(gbp))
773 coeff_val = get_sbits(gbp, frac_bits + 2);
774
775 s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits);
776 }
777
778 if (s->noise_type)
779 s->matrix_noise_shift[mat] = get_bits(gbp, 4);
780 else
781 s->matrix_noise_shift[mat] = 0;
782 }
783
784 return 0;
785}
786
787/** Read channel parameters. */
788
789static int read_channel_params(MLPDecodeContext *m, unsigned int substr,
790 GetBitContext *gbp, unsigned int ch)
791{
792 SubStream *s = &m->substream[substr];
793 ChannelParams *cp = &s->channel_params[ch];
794 FilterParams *fir = &cp->filter_params[FIR];
795 FilterParams *iir = &cp->filter_params[IIR];
796 int ret;
797
798 if (s->param_presence_flags & PARAM_FIR)
799 if (get_bits1(gbp))
800 if ((ret = read_filter_params(m, gbp, substr, ch, FIR)) < 0)
801 return ret;
802
803 if (s->param_presence_flags & PARAM_IIR)
804 if (get_bits1(gbp))
805 if ((ret = read_filter_params(m, gbp, substr, ch, IIR)) < 0)
806 return ret;
807
808 if (fir->order + iir->order > 8) {
809 av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n");
810 return AVERROR_INVALIDDATA;
811 }
812
813 if (fir->order && iir->order &&
814 fir->shift != iir->shift) {
815 av_log(m->avctx, AV_LOG_ERROR,
816 "FIR and IIR filters must use the same precision.\n");
817 return AVERROR_INVALIDDATA;
818 }
819 /* The FIR and IIR filters must have the same precision.
820 * To simplify the filtering code, only the precision of the
821 * FIR filter is considered. If only the IIR filter is employed,
822 * the FIR filter precision is set to that of the IIR filter, so
823 * that the filtering code can use it. */
824 if (!fir->order && iir->order)
825 fir->shift = iir->shift;
826
827 if (s->param_presence_flags & PARAM_HUFFOFFSET)
828 if (get_bits1(gbp))
829 cp->huff_offset = get_sbits(gbp, 15);
830
831 cp->codebook = get_bits(gbp, 2);
832 cp->huff_lsbs = get_bits(gbp, 5);
833
834 if (cp->huff_lsbs > 24) {
835 av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n");
836 cp->huff_lsbs = 0;
837 return AVERROR_INVALIDDATA;
838 }
839
840 cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
841
842 return 0;
843}
844
845/** Read decoding parameters that change more often than those in the restart
846 * header. */
847
848static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp,
849 unsigned int substr)
850{
851 SubStream *s = &m->substream[substr];
852 unsigned int ch;
853 int ret;
854
855 if (s->param_presence_flags & PARAM_PRESENCE)
856 if (get_bits1(gbp))
857 s->param_presence_flags = get_bits(gbp, 8);
858
859 if (s->param_presence_flags & PARAM_BLOCKSIZE)
860 if (get_bits1(gbp)) {
861 s->blocksize = get_bits(gbp, 9);
862 if (s->blocksize < 8 || s->blocksize > m->access_unit_size) {
863 av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n");
864 s->blocksize = 0;
865 return AVERROR_INVALIDDATA;
866 }
867 }
868
869 if (s->param_presence_flags & PARAM_MATRIX)
870 if (get_bits1(gbp))
871 if ((ret = read_matrix_params(m, substr, gbp)) < 0)
872 return ret;
873
874 if (s->param_presence_flags & PARAM_OUTSHIFT)
875 if (get_bits1(gbp)) {
876 for (ch = 0; ch <= s->max_matrix_channel; ch++)
877 s->output_shift[ch] = get_sbits(gbp, 4);
878 if (substr == m->max_decoded_substream)
879 m->dsp.mlp_pack_output = m->dsp.mlp_select_pack_output(s->ch_assign,
880 s->output_shift,
881 s->max_matrix_channel,
882 m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
883 }
884
885 if (s->param_presence_flags & PARAM_QUANTSTEP)
886 if (get_bits1(gbp))
887 for (ch = 0; ch <= s->max_channel; ch++) {
888 ChannelParams *cp = &s->channel_params[ch];
889
890 s->quant_step_size[ch] = get_bits(gbp, 4);
891
892 cp->sign_huff_offset = calculate_sign_huff(m, substr, ch);
893 }
894
895 for (ch = s->min_channel; ch <= s->max_channel; ch++)
896 if (get_bits1(gbp))
897 if ((ret = read_channel_params(m, substr, gbp, ch)) < 0)
898 return ret;
899
900 return 0;
901}
902
903#define MSB_MASK(bits) (-1u << (bits))
904
905/** Generate PCM samples using the prediction filters and residual values
906 * read from the data stream, and update the filter state. */
907
908static void filter_channel(MLPDecodeContext *m, unsigned int substr,
909 unsigned int channel)
910{
911 SubStream *s = &m->substream[substr];
912 const int32_t *fircoeff = s->channel_params[channel].coeff[FIR];
913 int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER];
914 int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE;
915 int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE;
916 FilterParams *fir = &s->channel_params[channel].filter_params[FIR];
917 FilterParams *iir = &s->channel_params[channel].filter_params[IIR];
918 unsigned int filter_shift = fir->shift;
919 int32_t mask = MSB_MASK(s->quant_step_size[channel]);
920
921 memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t));
922 memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t));
923
924 m->dsp.mlp_filter_channel(firbuf, fircoeff,
925 fir->order, iir->order,
926 filter_shift, mask, s->blocksize,
927 &m->sample_buffer[s->blockpos][channel]);
928
929 memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t));
930 memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t));
931}
932
933/** Read a block of PCM residual data (or actual if no filtering active). */
934
935static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp,
936 unsigned int substr)
937{
938 SubStream *s = &m->substream[substr];
939 unsigned int i, ch, expected_stream_pos = 0;
940 int ret;
941
942 if (s->data_check_present) {
943 expected_stream_pos = get_bits_count(gbp);
944 expected_stream_pos += get_bits(gbp, 16);
945 avpriv_request_sample(m->avctx,
946 "Substreams with VLC block size check info");
947 }
948
949 if (s->blockpos + s->blocksize > m->access_unit_size) {
950 av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n");
951 return AVERROR_INVALIDDATA;
952 }
953
954 memset(&m->bypassed_lsbs[s->blockpos][0], 0,
955 s->blocksize * sizeof(m->bypassed_lsbs[0]));
956
957 for (i = 0; i < s->blocksize; i++)
958 if ((ret = read_huff_channels(m, gbp, substr, i)) < 0)
959 return ret;
960
961 for (ch = s->min_channel; ch <= s->max_channel; ch++)
962 filter_channel(m, substr, ch);
963
964 s->blockpos += s->blocksize;
965
966 if (s->data_check_present) {
967 if (get_bits_count(gbp) != expected_stream_pos)
968 av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n");
969 skip_bits(gbp, 8);
970 }
971
972 return 0;
973}
974
975/** Data table used for TrueHD noise generation function. */
976
977static const int8_t noise_table[256] = {
978 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2,
979 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62,
980 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5,
981 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40,
982 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34,
983 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30,
984 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36,
985 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69,
986 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24,
987 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20,
988 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23,
989 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8,
990 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40,
991 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37,
992 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52,
993 -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70,
994};
995
996/** Noise generation functions.
997 * I'm not sure what these are for - they seem to be some kind of pseudorandom
998 * sequence generators, used to generate noise data which is used when the
999 * channels are rematrixed. I'm not sure if they provide a practical benefit
1000 * to compression, or just obfuscate the decoder. Are they for some kind of
1001 * dithering? */
1002
1003/** Generate two channels of noise, used in the matrix when
1004 * restart sync word == 0x31ea. */
1005
1006static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr)
1007{
1008 SubStream *s = &m->substream[substr];
1009 unsigned int i;
1010 uint32_t seed = s->noisegen_seed;
1011 unsigned int maxchan = s->max_matrix_channel;
1012
1013 for (i = 0; i < s->blockpos; i++) {
1014 uint16_t seed_shr7 = seed >> 7;
1015 m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) << s->noise_shift;
1016 m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) << s->noise_shift;
1017
1018 seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5);
1019 }
1020
1021 s->noisegen_seed = seed;
1022}
1023
1024/** Generate a block of noise, used when restart sync word == 0x31eb. */
1025
1026static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr)
1027{
1028 SubStream *s = &m->substream[substr];
1029 unsigned int i;
1030 uint32_t seed = s->noisegen_seed;
1031
1032 for (i = 0; i < m->access_unit_size_pow2; i++) {
1033 uint8_t seed_shr15 = seed >> 15;
1034 m->noise_buffer[i] = noise_table[seed_shr15];
1035 seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5);
1036 }
1037
1038 s->noisegen_seed = seed;
1039}
1040
f6fa7814 1041/** Write the audio data into the output buffer. */
2ba45a60 1042
f6fa7814
DM		 1043static int output_data(MLPDecodeContext *m, unsigned int substr,
1044 AVFrame *frame, int *got_frame_ptr)
2ba45a60 1045{
f6fa7814 1046 AVCodecContext *avctx = m->avctx;
2ba45a60
DM		 1047 SubStream *s = &m->substream[substr];
1048 unsigned int mat;
1049 unsigned int maxchan;
f6fa7814
DM		 1050 int ret;
1051 int is32 = (m->avctx->sample_fmt == AV_SAMPLE_FMT_S32);
1052
1053 if (m->avctx->channels != s->max_matrix_channel + 1) {
1054 av_log(m->avctx, AV_LOG_ERROR, "channel count mismatch\n");
1055 return AVERROR_INVALIDDATA;
1056 }
1057
1058 if (!s->blockpos) {
1059 av_log(avctx, AV_LOG_ERROR, "No samples to output.\n");
1060 return AVERROR_INVALIDDATA;
1061 }
2ba45a60
DM		 1062
1063 maxchan = s->max_matrix_channel;
1064 if (!s->noise_type) {
1065 generate_2_noise_channels(m, substr);
1066 maxchan += 2;
1067 } else {
1068 fill_noise_buffer(m, substr);
1069 }
1070
f6fa7814
DM		 1071 /* Apply the channel matrices in turn to reconstruct the original audio
1072 * samples. */
2ba45a60
DM		 1073 for (mat = 0; mat < s->num_primitive_matrices; mat++) {
1074 unsigned int dest_ch = s->matrix_out_ch[mat];
1075 m->dsp.mlp_rematrix_channel(&m->sample_buffer[0][0],
1076 s->matrix_coeff[mat],
1077 &m->bypassed_lsbs[0][mat],
1078 m->noise_buffer,
1079 s->num_primitive_matrices - mat,
1080 dest_ch,
1081 s->blockpos,
1082 maxchan,
1083 s->matrix_noise_shift[mat],
1084 m->access_unit_size_pow2,
1085 MSB_MASK(s->quant_step_size[dest_ch]));
1086 }
2ba45a60
DM		 1087
1088 /* get output buffer */
1089 frame->nb_samples = s->blockpos;
1090 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1091 return ret;
1092 s->lossless_check_data = m->dsp.mlp_pack_output(s->lossless_check_data,
1093 s->blockpos,
1094 m->sample_buffer,
1095 frame->data[0],
1096 s->ch_assign,
1097 s->output_shift,
1098 s->max_matrix_channel,
1099 is32);
1100
1101 /* Update matrix encoding side data */
1102 if ((ret = ff_side_data_update_matrix_encoding(frame, s->matrix_encoding)) < 0)
1103 return ret;
1104
1105 *got_frame_ptr = 1;
1106
1107 return 0;
1108}
1109
1110/** Read an access unit from the stream.
1111 * @return negative on error, 0 if not enough data is present in the input stream,
1112 * otherwise the number of bytes consumed. */
1113
1114static int read_access_unit(AVCodecContext *avctx, void* data,
1115 int *got_frame_ptr, AVPacket *avpkt)
1116{
1117 const uint8_t *buf = avpkt->data;
1118 int buf_size = avpkt->size;
1119 MLPDecodeContext *m = avctx->priv_data;
1120 GetBitContext gb;
1121 unsigned int length, substr;
1122 unsigned int substream_start;
1123 unsigned int header_size = 4;
1124 unsigned int substr_header_size = 0;
1125 uint8_t substream_parity_present[MAX_SUBSTREAMS];
1126 uint16_t substream_data_len[MAX_SUBSTREAMS];
1127 uint8_t parity_bits;
1128 int ret;
1129
1130 if (buf_size < 4)
1131 return AVERROR_INVALIDDATA;
1132
1133 length = (AV_RB16(buf) & 0xfff) * 2;
1134
1135 if (length < 4 || length > buf_size)
1136 return AVERROR_INVALIDDATA;
1137
1138 init_get_bits(&gb, (buf + 4), (length - 4) * 8);
1139
1140 m->is_major_sync_unit = 0;
1141 if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) {
1142 if (read_major_sync(m, &gb) < 0)
1143 goto error;
1144 m->is_major_sync_unit = 1;
f6fa7814 1145 header_size += m->major_sync_header_size;
2ba45a60
DM		 1146 }
1147
1148 if (!m->params_valid) {
1149 av_log(m->avctx, AV_LOG_WARNING,
1150 "Stream parameters not seen; skipping frame.\n");
1151 *got_frame_ptr = 0;
1152 return length;
1153 }
1154
1155 substream_start = 0;
1156
1157 for (substr = 0; substr < m->num_substreams; substr++) {
1158 int extraword_present, checkdata_present, end, nonrestart_substr;
1159
1160 extraword_present = get_bits1(&gb);
1161 nonrestart_substr = get_bits1(&gb);
1162 checkdata_present = get_bits1(&gb);
1163 skip_bits1(&gb);
1164
1165 end = get_bits(&gb, 12) * 2;
1166
1167 substr_header_size += 2;
1168
1169 if (extraword_present) {
1170 if (m->avctx->codec_id == AV_CODEC_ID_MLP) {
1171 av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n");
1172 goto error;
1173 }
1174 skip_bits(&gb, 16);
1175 substr_header_size += 2;
1176 }
1177
1178 if (!(nonrestart_substr ^ m->is_major_sync_unit)) {
1179 av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n");
1180 goto error;
1181 }
1182
1183 if (end + header_size + substr_header_size > length) {
1184 av_log(m->avctx, AV_LOG_ERROR,
1185 "Indicated length of substream %d data goes off end of "
1186 "packet.\n", substr);
1187 end = length - header_size - substr_header_size;
1188 }
1189
1190 if (end < substream_start) {
1191 av_log(avctx, AV_LOG_ERROR,
1192 "Indicated end offset of substream %d data "
1193 "is smaller than calculated start offset.\n",
1194 substr);
1195 goto error;
1196 }
1197
1198 if (substr > m->max_decoded_substream)
1199 continue;
1200
1201 substream_parity_present[substr] = checkdata_present;
1202 substream_data_len[substr] = end - substream_start;
1203 substream_start = end;
1204 }
1205
1206 parity_bits = ff_mlp_calculate_parity(buf, 4);
1207 parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size);
1208
1209 if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
1210 av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n");
1211 goto error;
1212 }
1213
1214 buf += header_size + substr_header_size;
1215
1216 for (substr = 0; substr <= m->max_decoded_substream; substr++) {
1217 SubStream *s = &m->substream[substr];
1218 init_get_bits(&gb, buf, substream_data_len[substr] * 8);
1219
1220 m->matrix_changed = 0;
1221 memset(m->filter_changed, 0, sizeof(m->filter_changed));
1222
1223 s->blockpos = 0;
1224 do {
1225 if (get_bits1(&gb)) {
1226 if (get_bits1(&gb)) {
1227 /* A restart header should be present. */
1228 if (read_restart_header(m, &gb, buf, substr) < 0)
1229 goto next_substr;
1230 s->restart_seen = 1;
1231 }
1232
1233 if (!s->restart_seen)
1234 goto next_substr;
1235 if (read_decoding_params(m, &gb, substr) < 0)
1236 goto next_substr;
1237 }
1238
1239 if (!s->restart_seen)
1240 goto next_substr;
1241
1242 if ((ret = read_block_data(m, &gb, substr)) < 0)
1243 return ret;
1244
1245 if (get_bits_count(&gb) >= substream_data_len[substr] * 8)
1246 goto substream_length_mismatch;
1247
1248 } while (!get_bits1(&gb));
1249
1250 skip_bits(&gb, (-get_bits_count(&gb)) & 15);
1251
1252 if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) {
1253 int shorten_by;
1254
1255 if (get_bits(&gb, 16) != 0xD234)
1256 return AVERROR_INVALIDDATA;
1257
1258 shorten_by = get_bits(&gb, 16);
1259 if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD && shorten_by & 0x2000)
1260 s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos);
1261 else if (m->avctx->codec_id == AV_CODEC_ID_MLP && shorten_by != 0xD234)
1262 return AVERROR_INVALIDDATA;
1263
1264 if (substr == m->max_decoded_substream)
1265 av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n");
1266 }
1267
1268 if (substream_parity_present[substr]) {
1269 uint8_t parity, checksum;
1270
1271 if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16)
1272 goto substream_length_mismatch;
1273
1274 parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2);
1275 checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2);
1276
1277 if ((get_bits(&gb, 8) ^ parity) != 0xa9 )
1278 av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr);
1279 if ( get_bits(&gb, 8) != checksum)
1280 av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr);
1281 }
1282
1283 if (substream_data_len[substr] * 8 != get_bits_count(&gb))
1284 goto substream_length_mismatch;
1285
1286next_substr:
1287 if (!s->restart_seen)
1288 av_log(m->avctx, AV_LOG_ERROR,
1289 "No restart header present in substream %d.\n", substr);
1290
1291 buf += substream_data_len[substr];
1292 }
1293
2ba45a60
DM		 1294 if ((ret = output_data(m, m->max_decoded_substream, data, got_frame_ptr)) < 0)
1295 return ret;
1296
1297 return length;
1298
1299substream_length_mismatch:
1300 av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr);
1301 return AVERROR_INVALIDDATA;
1302
1303error:
1304 m->params_valid = 0;
1305 return AVERROR_INVALIDDATA;
1306}
1307
1308#if CONFIG_MLP_DECODER
1309AVCodec ff_mlp_decoder = {
1310 .name = "mlp",
1311 .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"),
1312 .type = AVMEDIA_TYPE_AUDIO,
1313 .id = AV_CODEC_ID_MLP,
1314 .priv_data_size = sizeof(MLPDecodeContext),
1315 .init = mlp_decode_init,
1316 .decode = read_access_unit,
1317 .capabilities = CODEC_CAP_DR1,
1318};
1319#endif
1320#if CONFIG_TRUEHD_DECODER
1321AVCodec ff_truehd_decoder = {
1322 .name = "truehd",
1323 .long_name = NULL_IF_CONFIG_SMALL("TrueHD"),
1324 .type = AVMEDIA_TYPE_AUDIO,
1325 .id = AV_CODEC_ID_TRUEHD,
1326 .priv_data_size = sizeof(MLPDecodeContext),
1327 .init = mlp_decode_init,
1328 .decode = read_access_unit,
1329 .capabilities = CODEC_CAP_DR1,
1330};
1331#endif /* CONFIG_TRUEHD_DECODER */
ffmpeg Piment Noir Debian package repository