r3d.c
Go to the documentation of this file.
1 /*
2  * R3D REDCODE demuxer
3  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
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 
22 //#define DEBUG
23 
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "avformat.h"
28 #include "internal.h"
29 
30 typedef struct {
32  unsigned *video_offsets;
33  unsigned rdvo_offset;
34 } R3DContext;
35 
36 typedef struct {
37  unsigned size;
38  uint32_t tag;
39  uint64_t offset;
40 } Atom;
41 
42 static int read_atom(AVFormatContext *s, Atom *atom)
43 {
44  atom->offset = avio_tell(s->pb);
45  atom->size = avio_rb32(s->pb);
46  if (atom->size < 8)
47  return -1;
48  atom->tag = avio_rl32(s->pb);
49  av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
50  atom->size, (char*)&atom->tag, atom->offset);
51  return atom->size;
52 }
53 
55 {
57  char filename[258];
58  int tmp;
59  int av_unused tmp2;
60 
61  if (!st)
62  return AVERROR(ENOMEM);
65 
66  tmp = avio_r8(s->pb); // major version
67  tmp2 = avio_r8(s->pb); // minor version
68  av_dlog(s, "version %d.%d\n", tmp, tmp2);
69 
70  tmp = avio_rb16(s->pb); // unknown
71  av_dlog(s, "unknown1 %d\n", tmp);
72 
73  tmp = avio_rb32(s->pb);
74  avpriv_set_pts_info(st, 32, 1, tmp);
75 
76  tmp = avio_rb32(s->pb); // filenum
77  av_dlog(s, "filenum %d\n", tmp);
78 
79  avio_skip(s->pb, 32); // unknown
80 
81  st->codec->width = avio_rb32(s->pb);
82  st->codec->height = avio_rb32(s->pb);
83 
84  tmp = avio_rb16(s->pb); // unknown
85  av_dlog(s, "unknown2 %d\n", tmp);
86 
87  st->codec->time_base.den = avio_rb16(s->pb);
88  st->codec->time_base.num = avio_rb16(s->pb);
89 
90  tmp = avio_r8(s->pb); // audio channels
91  av_dlog(s, "audio channels %d\n", tmp);
92  if (tmp > 0) {
94  if (!ast)
95  return AVERROR(ENOMEM);
98  ast->codec->channels = tmp;
99  avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
100  }
101 
102  avio_read(s->pb, filename, 257);
103  filename[sizeof(filename)-1] = 0;
104  av_dict_set(&st->metadata, "filename", filename, 0);
105 
106  av_dlog(s, "filename %s\n", filename);
107  av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
108  av_dlog(s, "timescale %d\n", st->time_base.den);
109  av_dlog(s, "frame rate %d/%d\n",
110  st->codec->time_base.num, st->codec->time_base.den);
111 
112  return 0;
113 }
114 
115 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
116 {
117  R3DContext *r3d = s->priv_data;
118  AVStream *st = s->streams[0];
119  int i;
120 
121  r3d->video_offsets_count = (atom->size - 8) / 4;
122  r3d->video_offsets = av_malloc(atom->size);
123  if (!r3d->video_offsets)
124  return AVERROR(ENOMEM);
125 
126  for (i = 0; i < r3d->video_offsets_count; i++) {
127  r3d->video_offsets[i] = avio_rb32(s->pb);
128  if (!r3d->video_offsets[i]) {
129  r3d->video_offsets_count = i;
130  break;
131  }
132  av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
133  }
134 
135  if (st->codec->time_base.den)
136  st->duration = (uint64_t)r3d->video_offsets_count*
138  av_dlog(s, "duration %"PRId64"\n", st->duration);
139 
140  return 0;
141 }
142 
144 {
145  R3DContext *r3d = s->priv_data;
146  int av_unused tmp;
147 
148  r3d->rdvo_offset = avio_rb32(s->pb);
149  avio_rb32(s->pb); // rdvs offset
150  avio_rb32(s->pb); // rdao offset
151  avio_rb32(s->pb); // rdas offset
152 
153  tmp = avio_rb32(s->pb);
154  av_dlog(s, "num video chunks %d\n", tmp);
155 
156  tmp = avio_rb32(s->pb);
157  av_dlog(s, "num audio chunks %d\n", tmp);
158 
159  avio_skip(s->pb, 6*4);
160 }
161 
163 {
164  R3DContext *r3d = s->priv_data;
165  Atom atom;
166  int ret;
167 
168  if (read_atom(s, &atom) < 0) {
169  av_log(s, AV_LOG_ERROR, "error reading atom\n");
170  return -1;
171  }
172  if (atom.tag == MKTAG('R','E','D','1')) {
173  if ((ret = r3d_read_red1(s)) < 0) {
174  av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
175  return ret;
176  }
177  } else {
178  av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
179  return -1;
180  }
181 
182  s->data_offset = avio_tell(s->pb);
183  av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
184  if (!s->pb->seekable)
185  return 0;
186  // find REOB/REOF/REOS to load index
187  avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
188  if (read_atom(s, &atom) < 0)
189  av_log(s, AV_LOG_ERROR, "error reading end atom\n");
190 
191  if (atom.tag != MKTAG('R','E','O','B') &&
192  atom.tag != MKTAG('R','E','O','F') &&
193  atom.tag != MKTAG('R','E','O','S'))
194  goto out;
195 
196  r3d_read_reos(s);
197 
198  if (r3d->rdvo_offset) {
199  avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
200  if (read_atom(s, &atom) < 0)
201  av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
202  if (atom.tag == MKTAG('R','D','V','O')) {
203  if (r3d_read_rdvo(s, &atom) < 0)
204  av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
205  }
206  }
207 
208  out:
209  avio_seek(s->pb, s->data_offset, SEEK_SET);
210  return 0;
211 }
212 
213 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
214 {
215  AVStream *st = s->streams[0];
216  int tmp;
217  int av_unused tmp2;
218  uint64_t pos = avio_tell(s->pb);
219  unsigned dts;
220  int ret;
221 
222  dts = avio_rb32(s->pb);
223 
224  tmp = avio_rb32(s->pb);
225  av_dlog(s, "frame num %d\n", tmp);
226 
227  tmp = avio_r8(s->pb); // major version
228  tmp2 = avio_r8(s->pb); // minor version
229  av_dlog(s, "version %d.%d\n", tmp, tmp2);
230 
231  tmp = avio_rb16(s->pb); // unknown
232  av_dlog(s, "unknown %d\n", tmp);
233 
234  if (tmp > 4) {
235  tmp = avio_rb16(s->pb); // unknown
236  av_dlog(s, "unknown %d\n", tmp);
237 
238  tmp = avio_rb16(s->pb); // unknown
239  av_dlog(s, "unknown %d\n", tmp);
240 
241  tmp = avio_rb32(s->pb);
242  av_dlog(s, "width %d\n", tmp);
243  tmp = avio_rb32(s->pb);
244  av_dlog(s, "height %d\n", tmp);
245 
246  tmp = avio_rb32(s->pb);
247  av_dlog(s, "metadata len %d\n", tmp);
248  }
249  tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
250  if (tmp < 0)
251  return -1;
252  ret = av_get_packet(s->pb, pkt, tmp);
253  if (ret < 0) {
254  av_log(s, AV_LOG_ERROR, "error reading video packet\n");
255  return -1;
256  }
257 
258  pkt->stream_index = 0;
259  pkt->dts = dts;
260  if (st->codec->time_base.den)
261  pkt->duration = (uint64_t)st->time_base.den*
262  st->codec->time_base.num/st->codec->time_base.den;
263  av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
264 
265  return 0;
266 }
267 
268 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
269 {
270  AVStream *st = s->streams[1];
271  int av_unused tmp, tmp2;
272  int samples, size;
273  uint64_t pos = avio_tell(s->pb);
274  unsigned dts;
275  int ret;
276 
277  dts = avio_rb32(s->pb);
278 
279  st->codec->sample_rate = avio_rb32(s->pb);
280  if (st->codec->sample_rate <= 0) {
281  av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
282  return AVERROR_INVALIDDATA;
283  }
284 
285  samples = avio_rb32(s->pb);
286 
287  tmp = avio_rb32(s->pb);
288  av_dlog(s, "packet num %d\n", tmp);
289 
290  tmp = avio_rb16(s->pb); // unkown
291  av_dlog(s, "unknown %d\n", tmp);
292 
293  tmp = avio_r8(s->pb); // major version
294  tmp2 = avio_r8(s->pb); // minor version
295  av_dlog(s, "version %d.%d\n", tmp, tmp2);
296 
297  tmp = avio_rb32(s->pb); // unknown
298  av_dlog(s, "unknown %d\n", tmp);
299 
300  size = atom->size - 8 - (avio_tell(s->pb) - pos);
301  if (size < 0)
302  return -1;
303  ret = av_get_packet(s->pb, pkt, size);
304  if (ret < 0) {
305  av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
306  return ret;
307  }
308 
309  pkt->stream_index = 1;
310  pkt->dts = dts;
311  pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
312  av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
313  pkt->dts, pkt->duration, samples, st->codec->sample_rate);
314 
315  return 0;
316 }
317 
319 {
320  Atom atom;
321  int err = 0;
322 
323  while (!err) {
324  if (read_atom(s, &atom) < 0) {
325  err = -1;
326  break;
327  }
328  switch (atom.tag) {
329  case MKTAG('R','E','D','V'):
330  if (s->streams[0]->discard == AVDISCARD_ALL)
331  goto skip;
332  if (!(err = r3d_read_redv(s, pkt, &atom)))
333  return 0;
334  break;
335  case MKTAG('R','E','D','A'):
336  if (s->nb_streams < 2)
337  return -1;
338  if (s->streams[1]->discard == AVDISCARD_ALL)
339  goto skip;
340  if (!(err = r3d_read_reda(s, pkt, &atom)))
341  return 0;
342  break;
343  default:
344  skip:
345  avio_skip(s->pb, atom.size-8);
346  }
347  }
348  return err;
349 }
350 
351 static int r3d_probe(AVProbeData *p)
352 {
353  if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
354  return AVPROBE_SCORE_MAX;
355  return 0;
356 }
357 
358 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
359 {
360  AVStream *st = s->streams[0]; // video stream
361  R3DContext *r3d = s->priv_data;
362  int frame_num;
363 
364  if (!st->codec->time_base.num || !st->time_base.den)
365  return -1;
366 
367  frame_num = sample_time*st->codec->time_base.den/
368  ((int64_t)st->codec->time_base.num*st->time_base.den);
369  av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
370  frame_num, sample_time);
371 
372  if (frame_num < r3d->video_offsets_count) {
373  avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET);
374  } else {
375  av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
376  return -1;
377  }
378 
379  return 0;
380 }
381 
383 {
384  R3DContext *r3d = s->priv_data;
385 
386  av_freep(&r3d->video_offsets);
387 
388  return 0;
389 }
390 
392  .name = "r3d",
393  .long_name = NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
394  .priv_data_size = sizeof(R3DContext),
399  .read_seek = r3d_seek,
400 };