1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
|
/*
* MLP parser
* Copyright (c) 2007 Ian Caulfield
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* MLP parser
*/
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "get_bits.h"
#include "parser.h"
#include "mlp_parser.h"
#include "mlp.h"
static const uint8_t mlp_quants[16] = {
16, 20, 24, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
static const uint8_t mlp_channels[32] = {
1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4,
5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
const uint64_t ff_mlp_layout[32] = {
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
AV_CH_LAYOUT_2_1,
AV_CH_LAYOUT_QUAD,
AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_SURROUND,
AV_CH_LAYOUT_4POINT0,
AV_CH_LAYOUT_5POINT0_BACK,
AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_5POINT1_BACK,
AV_CH_LAYOUT_4POINT0,
AV_CH_LAYOUT_5POINT0_BACK,
AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_5POINT1_BACK,
AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,
AV_CH_LAYOUT_5POINT0_BACK,
AV_CH_LAYOUT_5POINT1_BACK,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const uint8_t thd_chancount[13] = {
// LR C LFE LRs LRvh LRc LRrs Cs Ts LRsd LRw Cvh LFE2
2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
};
static const uint64_t thd_layout[13] = {
AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR
AV_CH_FRONT_CENTER, // C
AV_CH_LOW_FREQUENCY, // LFE
AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs
AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh
AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs
AV_CH_BACK_CENTER, // Cs
AV_CH_TOP_CENTER, // Ts
AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw
AV_CH_TOP_FRONT_CENTER, // Cvh
AV_CH_LOW_FREQUENCY_2, // LFE2
};
static int mlp_samplerate(int in)
{
if (in == 0xF)
return 0;
return (in & 8 ? 44100 : 48000) << (in & 7) ;
}
static int truehd_channels(int chanmap)
{
int channels = 0, i;
for (i = 0; i < 13; i++)
channels += thd_chancount[i] * ((chanmap >> i) & 1);
return channels;
}
uint64_t ff_truehd_layout(int chanmap)
{
int i;
uint64_t layout = 0;
for (i = 0; i < 13; i++)
layout |= thd_layout[i] * ((chanmap >> i) & 1);
return layout;
}
/** Read a major sync info header - contains high level information about
* the stream - sample rate, channel arrangement etc. Most of this
* information is not actually necessary for decoding, only for playback.
* gb must be a freshly initialized GetBitContext with no bits read.
*/
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
{
int ratebits, channel_arrangement;
uint16_t checksum;
av_assert1(get_bits_count(gb) == 0);
if (gb->size_in_bits < 28 << 3) {
av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n");
return -1;
}
checksum = ff_mlp_checksum16(gb->buffer, 26);
if (checksum != AV_RL16(gb->buffer+26)) {
av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n");
return AVERROR_INVALIDDATA;
}
if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */
return AVERROR_INVALIDDATA;
mh->stream_type = get_bits(gb, 8);
if (mh->stream_type == 0xbb) {
mh->group1_bits = mlp_quants[get_bits(gb, 4)];
mh->group2_bits = mlp_quants[get_bits(gb, 4)];
ratebits = get_bits(gb, 4);
mh->group1_samplerate = mlp_samplerate(ratebits);
mh->group2_samplerate = mlp_samplerate(get_bits(gb, 4));
skip_bits(gb, 11);
channel_arrangement = get_bits(gb, 5);
mh->channels_mlp = mlp_channels[channel_arrangement];
mh->channel_layout_mlp = ff_mlp_layout[channel_arrangement];
} else if (mh->stream_type == 0xba) {
mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere?
mh->group2_bits = 0;
ratebits = get_bits(gb, 4);
mh->group1_samplerate = mlp_samplerate(ratebits);
mh->group2_samplerate = 0;
skip_bits(gb, 8);
channel_arrangement = get_bits(gb, 5);
mh->channels_thd_stream1 = truehd_channels(channel_arrangement);
mh->channel_layout_thd_stream1 = ff_truehd_layout(channel_arrangement);
skip_bits(gb, 2);
channel_arrangement = get_bits(gb, 13);
mh->channels_thd_stream2 = truehd_channels(channel_arrangement);
mh->channel_layout_thd_stream2 = ff_truehd_layout(channel_arrangement);
} else
return AVERROR_INVALIDDATA;
mh->access_unit_size = 40 << (ratebits & 7);
mh->access_unit_size_pow2 = 64 << (ratebits & 7);
skip_bits_long(gb, 48);
mh->is_vbr = get_bits1(gb);
mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4;
mh->num_substreams = get_bits(gb, 4);
skip_bits_long(gb, 4 + 11 * 8);
return 0;
}
typedef struct MLPParseContext
{
ParseContext pc;
int bytes_left;
int in_sync;
int num_substreams;
} MLPParseContext;
static av_cold int mlp_init(AVCodecParserContext *s)
{
ff_mlp_init_crc();
return 0;
}
static int mlp_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
MLPParseContext *mp = s->priv_data;
int sync_present;
uint8_t parity_bits;
int next;
int i, p = 0;
*poutbuf_size = 0;
if (buf_size == 0)
return 0;
if (!mp->in_sync) {
// Not in sync - find a major sync header
for (i = 0; i < buf_size; i++) {
mp->pc.state = (mp->pc.state << 8) | buf[i];
if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
// ignore if we do not have the data for the start of header
mp->pc.index + i >= 7) {
mp->in_sync = 1;
mp->bytes_left = 0;
break;
}
}
if (!mp->in_sync) {
if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
return buf_size;
}
ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size);
return i - 7;
}
if (mp->bytes_left == 0) {
// Find length of this packet
/* Copy overread bytes from last frame into buffer. */
for(; mp->pc.overread>0; mp->pc.overread--) {
mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
}
if (mp->pc.index + buf_size < 2) {
if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
return buf_size;
}
mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
| (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
if (mp->bytes_left <= 0) { // prevent infinite loop
goto lost_sync;
}
mp->bytes_left -= mp->pc.index;
}
next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;
if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
mp->bytes_left -= buf_size;
return buf_size;
}
mp->bytes_left = 0;
sync_present = (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
if (!sync_present) {
/* The first nibble of a frame is a parity check of the 4-byte
* access unit header and all the 2- or 4-byte substream headers. */
// Only check when this isn't a sync frame - syncs have a checksum.
parity_bits = 0;
for (i = -1; i < mp->num_substreams; i++) {
parity_bits ^= buf[p++];
parity_bits ^= buf[p++];
if (i < 0 || buf[p-2] & 0x80) {
parity_bits ^= buf[p++];
parity_bits ^= buf[p++];
}
}
if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
goto lost_sync;
}
} else {
GetBitContext gb;
MLPHeaderInfo mh;
init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
goto lost_sync;
avctx->bits_per_raw_sample = mh.group1_bits;
if (avctx->bits_per_raw_sample > 16)
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
else
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->sample_rate = mh.group1_samplerate;
s->duration = mh.access_unit_size;
if(!avctx->channels || !avctx->channel_layout) {
if (mh.stream_type == 0xbb) {
/* MLP stream */
#if FF_API_REQUEST_CHANNELS
if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
mh.num_substreams > 1) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else
#endif
if (avctx->request_channel_layout == AV_CH_LAYOUT_STEREO &&
mh.num_substreams > 1) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
avctx->channels = mh.channels_mlp;
avctx->channel_layout = mh.channel_layout_mlp;
}
} else { /* mh.stream_type == 0xba */
/* TrueHD stream */
#if FF_API_REQUEST_CHANNELS
if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
mh.num_substreams > 1) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else if (avctx->request_channels > 0 &&
avctx->request_channels <= mh.channels_thd_stream1) {
avctx->channels = mh.channels_thd_stream1;
avctx->channel_layout = mh.channel_layout_thd_stream1;
} else
#endif
if (avctx->request_channel_layout == AV_CH_LAYOUT_STEREO &&
mh.num_substreams > 1) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else if (avctx->request_channel_layout == mh.channel_layout_thd_stream1 ||
!mh.channels_thd_stream2) {
avctx->channels = mh.channels_thd_stream1;
avctx->channel_layout = mh.channel_layout_thd_stream1;
} else {
avctx->channels = mh.channels_thd_stream2;
avctx->channel_layout = mh.channel_layout_thd_stream2;
}
}
}
if (!mh.is_vbr) /* Stream is CBR */
avctx->bit_rate = mh.peak_bitrate;
mp->num_substreams = mh.num_substreams;
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
lost_sync:
mp->in_sync = 0;
return 1;
}
AVCodecParser ff_mlp_parser = {
.codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD },
.priv_data_size = sizeof(MLPParseContext),
.parser_init = mlp_init,
.parser_parse = mlp_parse,
.parser_close = ff_parse_close,
};
|