Libav
mlp_parser.c
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1 /*
2  * MLP parser
3  * Copyright (c) 2007 Ian Caulfield
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #include <stdint.h>
28 
30 #include "libavutil/crc.h"
31 #include "libavutil/internal.h"
32 #include "get_bits.h"
33 #include "parser.h"
34 #include "mlp_parser.h"
35 #include "mlp.h"
36 
37 static const uint8_t mlp_quants[16] = {
38  16, 20, 24, 0, 0, 0, 0, 0,
39  0, 0, 0, 0, 0, 0, 0, 0,
40 };
41 
42 static const uint8_t mlp_channels[32] = {
43  1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4,
44  5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
45 };
46 
47 static const uint64_t mlp_layout[32] = {
52  AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
53  AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY,
54  AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY,
58  AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
59  AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
63  AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
64  AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
66  AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY,
69  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
70 };
71 
72 static const uint8_t thd_chancount[13] = {
73 // LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2
74  2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
75 };
76 
77 static const uint64_t thd_layout[13] = {
79  AV_CH_FRONT_CENTER, // C
80  AV_CH_LOW_FREQUENCY, // LFE
85  AV_CH_BACK_CENTER, // Cs
86  AV_CH_TOP_CENTER, // Ts
90  AV_CH_LOW_FREQUENCY_2, // LFE2
91 };
92 
93 static int mlp_samplerate(int in)
94 {
95  if (in == 0xF)
96  return 0;
97 
98  return (in & 8 ? 44100 : 48000) << (in & 7) ;
99 }
100 
101 static int truehd_channels(int chanmap)
102 {
103  int channels = 0, i;
104 
105  for (i = 0; i < 13; i++)
106  channels += thd_chancount[i] * ((chanmap >> i) & 1);
107 
108  return channels;
109 }
110 
111 static uint64_t truehd_layout(int chanmap)
112 {
113  int i;
114  uint64_t layout = 0;
115 
116  for (i = 0; i < 13; i++)
117  layout |= thd_layout[i] * ((chanmap >> i) & 1);
118 
119  return layout;
120 }
121 
129 {
130  int ratebits, channel_arrangement;
131  uint16_t checksum;
132 
133  assert(get_bits_count(gb) == 0);
134 
135  if (gb->size_in_bits < 28 << 3) {
136  av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n");
137  return -1;
138  }
139 
140  checksum = ff_mlp_checksum16(gb->buffer, 26);
141  if (checksum != AV_RL16(gb->buffer+26)) {
142  av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n");
143  return AVERROR_INVALIDDATA;
144  }
145 
146  if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */
147  return AVERROR_INVALIDDATA;
148 
149  mh->stream_type = get_bits(gb, 8);
150 
151  if (mh->stream_type == 0xbb) {
152  mh->group1_bits = mlp_quants[get_bits(gb, 4)];
153  mh->group2_bits = mlp_quants[get_bits(gb, 4)];
154 
155  ratebits = get_bits(gb, 4);
156  mh->group1_samplerate = mlp_samplerate(ratebits);
158 
159  skip_bits(gb, 11);
160 
161  channel_arrangement = get_bits(gb, 5);
162  mh->channels_mlp = mlp_channels[channel_arrangement];
163  mh->channel_layout_mlp = mlp_layout[channel_arrangement];
164  } else if (mh->stream_type == 0xba) {
165  mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere?
166  mh->group2_bits = 0;
167 
168  ratebits = get_bits(gb, 4);
169  mh->group1_samplerate = mlp_samplerate(ratebits);
170  mh->group2_samplerate = 0;
171 
172  skip_bits(gb, 4);
173 
176 
177  channel_arrangement = get_bits(gb, 5);
178  mh->channels_thd_stream1 = truehd_channels(channel_arrangement);
179  mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement);
180 
182 
183  channel_arrangement = get_bits(gb, 13);
184  mh->channels_thd_stream2 = truehd_channels(channel_arrangement);
185  mh->channel_layout_thd_stream2 = truehd_layout(channel_arrangement);
186  } else
187  return AVERROR_INVALIDDATA;
188 
189  mh->access_unit_size = 40 << (ratebits & 7);
190  mh->access_unit_size_pow2 = 64 << (ratebits & 7);
191 
192  skip_bits_long(gb, 48);
193 
194  mh->is_vbr = get_bits1(gb);
195 
196  mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4;
197 
198  mh->num_substreams = get_bits(gb, 4);
199 
200  skip_bits_long(gb, 4 + 11 * 8);
201 
202  return 0;
203 }
204 
205 typedef struct MLPParseContext
206 {
208 
210 
211  int in_sync;
212 
215 
217 {
218  ff_mlp_init_crc();
219  return 0;
220 }
221 
223  AVCodecContext *avctx,
224  const uint8_t **poutbuf, int *poutbuf_size,
225  const uint8_t *buf, int buf_size)
226 {
227  MLPParseContext *mp = s->priv_data;
228  int sync_present;
229  uint8_t parity_bits;
230  int next;
231  int i, p = 0;
232 
233  *poutbuf_size = 0;
234  if (buf_size == 0)
235  return 0;
236 
237  if (!mp->in_sync) {
238  // Not in sync - find a major sync header
239 
240  for (i = 0; i < buf_size; i++) {
241  mp->pc.state = (mp->pc.state << 8) | buf[i];
242  if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
243  // ignore if we do not have the data for the start of header
244  mp->pc.index + i >= 7) {
245  mp->in_sync = 1;
246  mp->bytes_left = 0;
247  break;
248  }
249  }
250 
251  if (!mp->in_sync) {
252  ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size);
253  return buf_size;
254  }
255 
256  ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size);
257 
258  return i - 7;
259  }
260 
261  if (mp->bytes_left == 0) {
262  // Find length of this packet
263 
264  /* Copy overread bytes from last frame into buffer. */
265  for(; mp->pc.overread>0; mp->pc.overread--) {
266  mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
267  }
268 
269  if (mp->pc.index + buf_size < 2) {
270  ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size);
271  return buf_size;
272  }
273 
274  mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
275  | (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
276  mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
277  mp->bytes_left -= mp->pc.index;
278  }
279 
280  next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;
281 
282  if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
283  mp->bytes_left -= buf_size;
284  return buf_size;
285  }
286 
287  mp->bytes_left = 0;
288 
289  sync_present = (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
290 
291  if (!sync_present) {
292  /* The first nibble of a frame is a parity check of the 4-byte
293  * access unit header and all the 2- or 4-byte substream headers. */
294  // Only check when this isn't a sync frame - syncs have a checksum.
295 
296  parity_bits = 0;
297  for (i = -1; i < mp->num_substreams; i++) {
298  parity_bits ^= buf[p++];
299  parity_bits ^= buf[p++];
300 
301  if (i < 0 || buf[p-2] & 0x80) {
302  parity_bits ^= buf[p++];
303  parity_bits ^= buf[p++];
304  }
305  }
306 
307  if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
308  av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
309  goto lost_sync;
310  }
311  } else {
312  GetBitContext gb;
313  MLPHeaderInfo mh;
314 
315  init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
316  if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
317  goto lost_sync;
318 
319  avctx->bits_per_raw_sample = mh.group1_bits;
320  if (avctx->bits_per_raw_sample > 16)
321  avctx->sample_fmt = AV_SAMPLE_FMT_S32;
322  else
323  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
324  avctx->sample_rate = mh.group1_samplerate;
325  s->duration = mh.access_unit_size;
326 
327  if (mh.stream_type == 0xbb) {
328  /* MLP stream */
329 #if FF_API_REQUEST_CHANNELS
331  if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
332  mh.num_substreams > 1) {
333  avctx->channels = 2;
335  } else
337 #endif
338  if (avctx->request_channel_layout &&
340  avctx->request_channel_layout &&
341  mh.num_substreams > 1) {
342  avctx->channels = 2;
344  } else {
345  avctx->channels = mh.channels_mlp;
347  }
348  } else { /* mh.stream_type == 0xba */
349  /* TrueHD stream */
350 #if FF_API_REQUEST_CHANNELS
352  if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
353  mh.num_substreams > 1) {
354  avctx->channels = 2;
356  } else if (avctx->request_channels > 0 &&
357  avctx->request_channels <= mh.channels_thd_stream1) {
358  avctx->channels = mh.channels_thd_stream1;
360  } else
362 #endif
363  if (avctx->request_channel_layout &&
365  avctx->request_channel_layout &&
366  mh.num_substreams > 1) {
367  avctx->channels = 2;
369  } else if (!mh.channels_thd_stream2 ||
370  (avctx->request_channel_layout &&
372  avctx->request_channel_layout)) {
373  avctx->channels = mh.channels_thd_stream1;
375  } else {
376  avctx->channels = mh.channels_thd_stream2;
378  }
379  }
380 
381  if (!mh.is_vbr) /* Stream is CBR */
382  avctx->bit_rate = mh.peak_bitrate;
383 
385  }
386 
387  *poutbuf = buf;
388  *poutbuf_size = buf_size;
389 
390  return next;
391 
392 lost_sync:
393  mp->in_sync = 0;
394  return 1;
395 }
396 
399  .priv_data_size = sizeof(MLPParseContext),
400  .parser_init = mlp_init,
401  .parser_parse = mlp_parse,
402  .parser_close = ff_parse_close,
403 };
int channels_thd_stream1
Channel count for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parser.h:47
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
#define AV_CH_TOP_FRONT_RIGHT
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
#define AV_CH_LAYOUT_SURROUND
uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
Definition: mlp.c:64
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:199
attribute_deprecated int request_channels
Decoder should decode to this many channels if it can (0 for default)
Definition: avcodec.h:1844
#define AV_CH_TOP_FRONT_LEFT
int num_substreams
Number of substreams within stream.
Definition: mlp_parser.h:59
#define AV_CH_TOP_FRONT_CENTER
int codec_ids[5]
Definition: avcodec.h:3822
#define AV_CH_LOW_FREQUENCY_2
const uint8_t * buffer
Definition: get_bits.h:54
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_CH_LAYOUT_4POINT0
uint64_t channel_layout_mlp
Channel layout for MLP streams.
Definition: mlp_parser.h:49
int duration
Duration of the current frame.
Definition: avcodec.h:3798
#define AV_CH_SURROUND_DIRECT_RIGHT
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2514
#define AV_CH_LAYOUT_STEREO
static uint64_t truehd_layout(int chanmap)
Definition: mlp_parser.c:111
#define AV_CH_LAYOUT_5POINT0
int access_unit_size
Number of samples per coded frame.
Definition: mlp_parser.h:53
int peak_bitrate
Peak bitrate for VBR, actual bitrate (==peak) for CBR.
Definition: mlp_parser.h:57
#define AV_CH_WIDE_LEFT
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1799
uint8_t
#define av_cold
Definition: attributes.h:66
int channel_modifier_thd_stream0
Channel modifier for substream 0 of TrueHD sreams ("2-channel presentation")
Definition: mlp_parser.h:42
static const uint64_t thd_layout[13]
Definition: mlp_parser.c:77
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_CH_WIDE_RIGHT
ParseContext pc
Definition: mlp_parser.c:207
#define AV_CH_LOW_FREQUENCY
static int mlp_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: mlp_parser.c:222
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
bitstream reader API header.
#define AV_CH_BACK_LEFT
static const uint8_t mlp_channels[32]
Definition: mlp_parser.c:42
signed 32 bits
Definition: samplefmt.h:65
AVCodecParser ff_mlp_parser
Definition: mlp_parser.c:397
#define AV_CH_LAYOUT_5POINT1
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int channel_modifier_thd_stream2
Channel modifier for substream 2 of TrueHD sreams ("8-channel presentation")
Definition: mlp_parser.h:44
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:217
static int truehd_channels(int chanmap)
Definition: mlp_parser.c:101
int channels_mlp
Channel count for MLP streams.
Definition: mlp_parser.h:46
int overread_index
the index into ParseContext.buffer of the overread bytes
Definition: parser.h:36
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1852
#define AV_CH_LAYOUT_2_1
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:287
#define AV_CH_LAYOUT_2_2
common internal API header
#define AV_CH_TOP_CENTER
int bit_rate
the average bitrate
Definition: avcodec.h:1114
audio channel layout utility functions
int overread
the number of bytes which where irreversibly read from the next frame
Definition: parser.h:35
int size_in_bits
Definition: get_bits.h:56
MLP parser prototypes.
int is_vbr
Stream is VBR instead of CBR.
Definition: mlp_parser.h:56
#define AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
if(ac->has_optimized_func)
int stream_type
0xBB for MLP, 0xBA for TrueHD
Definition: mlp_parser.h:34
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
static const uint8_t mlp_quants[16]
Definition: mlp_parser.c:37
int access_unit_size_pow2
Next power of two above number of samples per frame.
Definition: mlp_parser.h:54
uint8_t * buffer
Definition: parser.h:29
int sample_rate
samples per second
Definition: avcodec.h:1791
static int mlp_samplerate(int in)
Definition: mlp_parser.c:93
int channel_modifier_thd_stream1
Channel modifier for substream 1 of TrueHD sreams ("6-channel presentation")
Definition: mlp_parser.h:43
main external API structure.
Definition: avcodec.h:1050
#define AV_CH_FRONT_LEFT
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
#define END_NOT_FOUND
Definition: parser.h:40
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:304
int group2_bits
Bit depth of the second substream (MLP only)
Definition: mlp_parser.h:37
#define AV_CH_BACK_CENTER
#define AV_CH_SIDE_RIGHT
int channels_thd_stream2
Channel count for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parser.h:48
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:76
signed 16 bits
Definition: samplefmt.h:64
uint64_t channel_layout_thd_stream1
Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
Definition: mlp_parser.h:50
uint64_t channel_layout_thd_stream2
Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
Definition: mlp_parser.h:51
int index
Definition: parser.h:30
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
Read a major sync info header - contains high level information about the stream - sample rate...
Definition: mlp_parser.c:128
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:77
int channels
number of audio channels
Definition: avcodec.h:1792
int group1_bits
The bit depth of the first substream.
Definition: mlp_parser.h:36
av_cold void ff_mlp_init_crc(void)
Definition: mlp.c:54
uint64_t layout
#define AV_CH_SURROUND_DIRECT_LEFT
#define AV_CH_FRONT_RIGHT
static const uint8_t thd_chancount[13]
Definition: mlp_parser.c:72
#define AV_CH_SIDE_LEFT
int group1_samplerate
Sample rate of first substream.
Definition: mlp_parser.h:39
#define AV_CH_LAYOUT_MONO
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1859
int group2_samplerate
Sample rate of second substream (MLP only)
Definition: mlp_parser.h:40
#define AV_CH_BACK_RIGHT
static av_cold int mlp_init(AVCodecParserContext *s)
Definition: mlp_parser.c:216
static const uint64_t mlp_layout[32]
Definition: mlp_parser.c:47