FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
brstm.c
Go to the documentation of this file.
1 /*
2  * BRSTM demuxer
3  * Copyright (c) 2012 Paul B Mahol
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 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/bytestream.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 typedef struct BRSTMDemuxContext {
28  uint32_t block_size;
29  uint32_t block_count;
30  uint32_t current_block;
36 
37 static int probe(AVProbeData *p)
38 {
39  if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
40  (AV_RL16(p->buf + 4) == 0xFFFE ||
41  AV_RL16(p->buf + 4) == 0xFEFF))
42  return AVPROBE_SCORE_MAX / 3 * 2;
43  return 0;
44 }
45 
47 {
49 
50  av_freep(&b->table);
51  av_freep(&b->adpc);
52 
53  return 0;
54 }
55 
57 {
59  int bom, major, minor, codec, chunk;
60  int64_t pos, h1offset, toffset;
61  uint32_t size, start, asize;
62  AVStream *st;
63  int ret = AVERROR_EOF;
64 
65  st = avformat_new_stream(s, NULL);
66  if (!st)
67  return AVERROR(ENOMEM);
69 
70  avio_skip(s->pb, 4);
71 
72  bom = avio_rb16(s->pb);
73  if (bom != 0xFEFF && bom != 0xFFFE) {
74  av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
75  return AVERROR_INVALIDDATA;
76  }
77  if (bom == 0xFFFE) {
78  avpriv_request_sample(s, "little endian byte order");
79  return AVERROR_PATCHWELCOME;
80  }
81 
82  major = avio_r8(s->pb);
83  minor = avio_r8(s->pb);
84  avio_skip(s->pb, 4); // size of file
85  size = avio_rb16(s->pb);
86  if (size < 14)
87  return AVERROR_INVALIDDATA;
88 
89  avio_skip(s->pb, size - 14);
90  pos = avio_tell(s->pb);
91  if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
92  return AVERROR_INVALIDDATA;
93  size = avio_rb32(s->pb);
94  if (size < 256)
95  return AVERROR_INVALIDDATA;
96  avio_skip(s->pb, 4); // unknown
97  h1offset = avio_rb32(s->pb);
98  if (h1offset > size)
99  return AVERROR_INVALIDDATA;
100  avio_skip(s->pb, 12);
101  toffset = avio_rb32(s->pb) + 16LL;
102  if (toffset > size)
103  return AVERROR_INVALIDDATA;
104 
105  avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
106  codec = avio_r8(s->pb);
107 
108  switch (codec) {
109  case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
110  case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break;
111  case 2: codec = AV_CODEC_ID_ADPCM_THP; break;
112  default:
113  avpriv_request_sample(s, "codec %d", codec);
114  return AVERROR_PATCHWELCOME;
115  }
116 
117  avio_skip(s->pb, 1); // loop flag
118  st->codec->codec_id = codec;
119  st->codec->channels = avio_r8(s->pb);
120  if (!st->codec->channels)
121  return AVERROR_INVALIDDATA;
122 
123  avio_skip(s->pb, 1); // padding
124  st->codec->sample_rate = avio_rb16(s->pb);
125  if (!st->codec->sample_rate)
126  return AVERROR_INVALIDDATA;
127 
128  avio_skip(s->pb, 2); // padding
129  avio_skip(s->pb, 4); // loop start sample
130  st->start_time = 0;
131  st->duration = avio_rb32(s->pb);
132  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
133 
134  start = avio_rb32(s->pb);
135  b->current_block = 0;
136  b->block_count = avio_rb32(s->pb);
137  if (b->block_count > UINT16_MAX) {
138  av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count);
139  return AVERROR_INVALIDDATA;
140  }
141 
142  b->block_size = avio_rb32(s->pb);
143  if (b->block_size > UINT16_MAX / st->codec->channels)
144  return AVERROR_INVALIDDATA;
145  b->block_size *= st->codec->channels;
146 
147  b->samples_per_block = avio_rb32(s->pb);
149  if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels)
150  return AVERROR_INVALIDDATA;
152 
153  avio_skip(s->pb, 4); // last block samples
154  avio_skip(s->pb, 4); // last block size
155 
156  if (codec == AV_CODEC_ID_ADPCM_THP) {
157  int ch;
158 
159  avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
160  toffset = avio_rb32(s->pb) + 16LL;
161  if (toffset > size)
162  return AVERROR_INVALIDDATA;
163 
164  avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
165  b->table = av_mallocz(32 * st->codec->channels);
166  if (!b->table)
167  return AVERROR(ENOMEM);
168 
169  for (ch = 0; ch < st->codec->channels; ch++) {
170  if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
171  ret = AVERROR_INVALIDDATA;
172  goto fail;
173  }
174  avio_skip(s->pb, 24);
175  }
176  }
177 
178  if (size < (avio_tell(s->pb) - pos)) {
179  ret = AVERROR_INVALIDDATA;
180  goto fail;
181  }
182  avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
183 
184  while (!url_feof(s->pb)) {
185  chunk = avio_rl32(s->pb);
186  size = avio_rb32(s->pb);
187  if (size < 8) {
188  ret = AVERROR_INVALIDDATA;
189  goto fail;
190  }
191  size -= 8;
192  switch (chunk) {
193  case MKTAG('A','D','P','C'):
194  if (codec != AV_CODEC_ID_ADPCM_THP)
195  goto skip;
196 
197  asize = b->block_count * st->codec->channels * 4;
198  if (size < asize) {
199  ret = AVERROR_INVALIDDATA;
200  goto fail;
201  }
202  if (b->adpc) {
203  av_log(s, AV_LOG_WARNING, "skipping additonal ADPC chunk\n");
204  goto skip;
205  } else {
206  b->adpc = av_mallocz(asize);
207  if (!b->adpc) {
208  ret = AVERROR(ENOMEM);
209  goto fail;
210  }
211  avio_read(s->pb, b->adpc, asize);
212  avio_skip(s->pb, size - asize);
213  }
214  break;
215  case MKTAG('D','A','T','A'):
216  if ((start < avio_tell(s->pb)) ||
217  (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) {
218  ret = AVERROR_INVALIDDATA;
219  goto fail;
220  }
221  avio_skip(s->pb, start - avio_tell(s->pb));
222 
223  if (major != 1 || minor)
224  avpriv_request_sample(s, "Version %d.%d", major, minor);
225 
226  return 0;
227  default:
228  av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
229 skip:
230  avio_skip(s->pb, size);
231  }
232  }
233 
234 fail:
235  read_close(s);
236 
237  return ret;
238 }
239 
241 {
242  AVCodecContext *codec = s->streams[0]->codec;
244  uint32_t samples, size;
245  int ret;
246 
247  if (url_feof(s->pb))
248  return AVERROR_EOF;
249  b->current_block++;
250  if (b->current_block == b->block_count) {
251  size = b->last_block_used_bytes;
252  samples = size / (8 * codec->channels) * 14;
253  } else if (b->current_block < b->block_count) {
254  size = b->block_size;
255  samples = b->samples_per_block;
256  } else {
257  return AVERROR_EOF;
258  }
259 
260  if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) {
261  uint8_t *dst;
262 
263  if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0)
264  return AVERROR(ENOMEM);
265  dst = pkt->data;
266  bytestream_put_be32(&dst, size);
267  bytestream_put_be32(&dst, samples);
268  bytestream_put_buffer(&dst, b->table, 32 * codec->channels);
269  bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels *
270  (b->current_block - 1), 4 * codec->channels);
271 
272  ret = avio_read(s->pb, dst, size);
273  if (ret != size)
274  av_free_packet(pkt);
275  pkt->duration = samples;
276  } else {
277  ret = av_get_packet(s->pb, pkt, size);
278  }
279 
280  pkt->stream_index = 0;
281 
282  if (ret != size)
283  ret = AVERROR(EIO);
284 
285  return ret;
286 }
287 
289  .name = "brstm",
290  .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
291  .priv_data_size = sizeof(BRSTMDemuxContext),
292  .read_probe = probe,
296  .extensions = "brstm",
297 };