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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / mlp_parser.c
CommitLineData
2ba45a60
DM		 1/*
2 * MLP parser
3 * Copyright (c) 2007 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 parser
25 */
26
27#include <stdint.h>
28
29#include "libavutil/channel_layout.h"
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
37static 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
42static 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
47const uint64_t ff_mlp_layout[32] = {
48 AV_CH_LAYOUT_MONO,
49 AV_CH_LAYOUT_STEREO,
50 AV_CH_LAYOUT_2_1,
51 AV_CH_LAYOUT_QUAD,
52 AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
53 AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY,
54 AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,
55 AV_CH_LAYOUT_SURROUND,
56 AV_CH_LAYOUT_4POINT0,
57 AV_CH_LAYOUT_5POINT0_BACK,
58 AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
59 AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
60 AV_CH_LAYOUT_5POINT1_BACK,
61 AV_CH_LAYOUT_4POINT0,
62 AV_CH_LAYOUT_5POINT0_BACK,
63 AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY,
64 AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,
65 AV_CH_LAYOUT_5POINT1_BACK,
66 AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,
67 AV_CH_LAYOUT_5POINT0_BACK,
68 AV_CH_LAYOUT_5POINT1_BACK,
69 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
70};
71
72static 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
77static const uint64_t thd_layout[13] = {
78 AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT, // LR
79 AV_CH_FRONT_CENTER, // C
80 AV_CH_LOW_FREQUENCY, // LFE
81 AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT, // LRs
82 AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT, // LRvh
83 AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER, // LRc
84 AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT, // LRrs
85 AV_CH_BACK_CENTER, // Cs
86 AV_CH_TOP_CENTER, // Ts
87 AV_CH_SURROUND_DIRECT_LEFT|AV_CH_SURROUND_DIRECT_RIGHT, // LRsd
88 AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT, // LRw
89 AV_CH_TOP_FRONT_CENTER, // Cvh
90 AV_CH_LOW_FREQUENCY_2, // LFE2
91};
92
93static int mlp_samplerate(int in)
94{
95 if (in == 0xF)
96 return 0;
97
98 return (in & 8 ? 44100 : 48000) << (in & 7) ;
99}
100
101static 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
111uint64_t ff_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
f6fa7814
DM		 122static int ff_mlp_get_major_sync_size(const uint8_t * buf, int bufsize)
123{
124 int has_extension, extensions = 0;
125 int size = 28;
126 if (bufsize < 28)
127 return -1;
128
129 if (AV_RB32(buf) == 0xf8726fba) {
130 has_extension = buf[25] & 1;
131 if (has_extension) {
132 extensions = buf[26] >> 4;
133 size += 2 + extensions * 2;
134 }
135 }
136 return size;
137}
138
2ba45a60
DM		 139/** Read a major sync info header - contains high level information about
140 * the stream - sample rate, channel arrangement etc. Most of this
141 * information is not actually necessary for decoding, only for playback.
142 * gb must be a freshly initialized GetBitContext with no bits read.
143 */
144
145int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
146{
f6fa7814 147 int ratebits, channel_arrangement, header_size;
2ba45a60
DM		 148 uint16_t checksum;
149
150 av_assert1(get_bits_count(gb) == 0);
151
f6fa7814
DM		 152 header_size = ff_mlp_get_major_sync_size(gb->buffer, gb->size_in_bits >> 3);
153 if (header_size < 0 || gb->size_in_bits < header_size << 3) {
2ba45a60
DM		 154 av_log(log, AV_LOG_ERROR, "packet too short, unable to read major sync\n");
155 return -1;
156 }
157
f6fa7814
DM		 158 checksum = ff_mlp_checksum16(gb->buffer, header_size - 2);
159 if (checksum != AV_RL16(gb->buffer+header_size-2)) {
2ba45a60
DM		 160 av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n");
161 return AVERROR_INVALIDDATA;
162 }
163
164 if (get_bits_long(gb, 24) != 0xf8726f) /* Sync words */
165 return AVERROR_INVALIDDATA;
166
167 mh->stream_type = get_bits(gb, 8);
f6fa7814 168 mh->header_size = header_size;
2ba45a60
DM		 169
170 if (mh->stream_type == 0xbb) {
171 mh->group1_bits = mlp_quants[get_bits(gb, 4)];
172 mh->group2_bits = mlp_quants[get_bits(gb, 4)];
173
174 ratebits = get_bits(gb, 4);
175 mh->group1_samplerate = mlp_samplerate(ratebits);
176 mh->group2_samplerate = mlp_samplerate(get_bits(gb, 4));
177
178 skip_bits(gb, 11);
179
180 mh->channel_arrangement=
181 channel_arrangement = get_bits(gb, 5);
182 mh->channels_mlp = mlp_channels[channel_arrangement];
183 mh->channel_layout_mlp = ff_mlp_layout[channel_arrangement];
184 } else if (mh->stream_type == 0xba) {
185 mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere?
186 mh->group2_bits = 0;
187
188 ratebits = get_bits(gb, 4);
189 mh->group1_samplerate = mlp_samplerate(ratebits);
190 mh->group2_samplerate = 0;
191
192 skip_bits(gb, 4);
193
194 mh->channel_modifier_thd_stream0 = get_bits(gb, 2);
195 mh->channel_modifier_thd_stream1 = get_bits(gb, 2);
196
197 mh->channel_arrangement=
198 channel_arrangement = get_bits(gb, 5);
199 mh->channels_thd_stream1 = truehd_channels(channel_arrangement);
200 mh->channel_layout_thd_stream1 = ff_truehd_layout(channel_arrangement);
201
202 mh->channel_modifier_thd_stream2 = get_bits(gb, 2);
203
204 channel_arrangement = get_bits(gb, 13);
205 mh->channels_thd_stream2 = truehd_channels(channel_arrangement);
206 mh->channel_layout_thd_stream2 = ff_truehd_layout(channel_arrangement);
207 } else
208 return AVERROR_INVALIDDATA;
209
210 mh->access_unit_size = 40 << (ratebits & 7);
211 mh->access_unit_size_pow2 = 64 << (ratebits & 7);
212
213 skip_bits_long(gb, 48);
214
215 mh->is_vbr = get_bits1(gb);
216
217 mh->peak_bitrate = (get_bits(gb, 15) * mh->group1_samplerate + 8) >> 4;
218
219 mh->num_substreams = get_bits(gb, 4);
220
f6fa7814 221 skip_bits_long(gb, 4 + (header_size - 17) * 8);
2ba45a60
DM		 222
223 return 0;
224}
225
226typedef struct MLPParseContext
227{
228 ParseContext pc;
229
230 int bytes_left;
231
232 int in_sync;
233
234 int num_substreams;
235} MLPParseContext;
236
237static av_cold int mlp_init(AVCodecParserContext *s)
238{
239 ff_mlp_init_crc();
240 return 0;
241}
242
243static int mlp_parse(AVCodecParserContext *s,
244 AVCodecContext *avctx,
245 const uint8_t **poutbuf, int *poutbuf_size,
246 const uint8_t *buf, int buf_size)
247{
248 MLPParseContext *mp = s->priv_data;
249 int sync_present;
250 uint8_t parity_bits;
251 int next;
252 int ret;
253 int i, p = 0;
254
255 *poutbuf_size = 0;
256 if (buf_size == 0)
257 return 0;
258
259 if (!mp->in_sync) {
260 // Not in sync - find a major sync header
261
262 for (i = 0; i < buf_size; i++) {
263 mp->pc.state = (mp->pc.state << 8) | buf[i];
264 if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
265 // ignore if we do not have the data for the start of header
266 mp->pc.index + i >= 7) {
267 mp->in_sync = 1;
268 mp->bytes_left = 0;
269 break;
270 }
271 }
272
273 if (!mp->in_sync) {
274 if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
275 av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
276 return buf_size;
277 }
278
279 if ((ret = ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size)) < 0) {
280 av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
281 return ret;
282 }
283
284 return i - 7;
285 }
286
287 if (mp->bytes_left == 0) {
288 // Find length of this packet
289
290 /* Copy overread bytes from last frame into buffer. */
291 for(; mp->pc.overread>0; mp->pc.overread--) {
292 mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
293 }
294
295 if (mp->pc.index + buf_size < 2) {
296 if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
297 av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
298 return buf_size;
299 }
300
301 mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
302 | (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
303 mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
304 if (mp->bytes_left <= 0) { // prevent infinite loop
305 goto lost_sync;
306 }
307 mp->bytes_left -= mp->pc.index;
308 }
309
310 next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;
311
312 if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
313 mp->bytes_left -= buf_size;
314 return buf_size;
315 }
316
317 mp->bytes_left = 0;
318
319 sync_present = (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
320
321 if (!sync_present) {
322 /* The first nibble of a frame is a parity check of the 4-byte
323 * access unit header and all the 2- or 4-byte substream headers. */
324 // Only check when this isn't a sync frame - syncs have a checksum.
325
326 parity_bits = 0;
327 for (i = -1; i < mp->num_substreams; i++) {
328 parity_bits ^= buf[p++];
329 parity_bits ^= buf[p++];
330
331 if (i < 0 || buf[p-2] & 0x80) {
332 parity_bits ^= buf[p++];
333 parity_bits ^= buf[p++];
334 }
335 }
336
337 if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
338 av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
339 goto lost_sync;
340 }
341 } else {
342 GetBitContext gb;
343 MLPHeaderInfo mh;
344
345 init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
346 if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
347 goto lost_sync;
348
349 avctx->bits_per_raw_sample = mh.group1_bits;
350 if (avctx->bits_per_raw_sample > 16)
351 avctx->sample_fmt = AV_SAMPLE_FMT_S32;
352 else
353 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
354 avctx->sample_rate = mh.group1_samplerate;
355 s->duration = mh.access_unit_size;
356
357 if(!avctx->channels || !avctx->channel_layout) {
358 if (mh.stream_type == 0xbb) {
359 /* MLP stream */
360#if FF_API_REQUEST_CHANNELS
361FF_DISABLE_DEPRECATION_WARNINGS
362 if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
363 mh.num_substreams > 1) {
364 avctx->channels = 2;
365 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
366FF_ENABLE_DEPRECATION_WARNINGS
367 } else
368#endif
369 if (avctx->request_channel_layout &&
370 (avctx->request_channel_layout & AV_CH_LAYOUT_STEREO) ==
371 avctx->request_channel_layout &&
372 mh.num_substreams > 1) {
373 avctx->channels = 2;
374 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
375 } else {
376 avctx->channels = mh.channels_mlp;
377 avctx->channel_layout = mh.channel_layout_mlp;
378 }
379 } else { /* mh.stream_type == 0xba */
380 /* TrueHD stream */
381#if FF_API_REQUEST_CHANNELS
382FF_DISABLE_DEPRECATION_WARNINGS
383 if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
384 mh.num_substreams > 1) {
385 avctx->channels = 2;
386 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
387 } else if (avctx->request_channels > 0 &&
388 avctx->request_channels <= mh.channels_thd_stream1) {
389 avctx->channels = mh.channels_thd_stream1;
390 avctx->channel_layout = mh.channel_layout_thd_stream1;
391FF_ENABLE_DEPRECATION_WARNINGS
392 } else
393#endif
394 if (avctx->request_channel_layout &&
395 (avctx->request_channel_layout & AV_CH_LAYOUT_STEREO) ==
396 avctx->request_channel_layout &&
397 mh.num_substreams > 1) {
398 avctx->channels = 2;
399 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
400 } else if (!mh.channels_thd_stream2 ||
401 (avctx->request_channel_layout &&
402 (avctx->request_channel_layout & mh.channel_layout_thd_stream1) ==
403 avctx->request_channel_layout)) {
404 avctx->channels = mh.channels_thd_stream1;
405 avctx->channel_layout = mh.channel_layout_thd_stream1;
406 } else {
407 avctx->channels = mh.channels_thd_stream2;
408 avctx->channel_layout = mh.channel_layout_thd_stream2;
409 }
410 }
411 }
412
413 if (!mh.is_vbr) /* Stream is CBR */
414 avctx->bit_rate = mh.peak_bitrate;
415
416 mp->num_substreams = mh.num_substreams;
417 }
418
419 *poutbuf = buf;
420 *poutbuf_size = buf_size;
421
422 return next;
423
424lost_sync:
425 mp->in_sync = 0;
426 return 1;
427}
428
429AVCodecParser ff_mlp_parser = {
430 .codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD },
431 .priv_data_size = sizeof(MLPParseContext),
432 .parser_init = mlp_init,
433 .parser_parse = mlp_parse,
434 .parser_close = ff_parse_close,
435};
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