Libav
r3d.c
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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 #include "libavutil/intreadwrite.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/mathematics.h"
25 #include "avformat.h"
26 #include "internal.h"
27 
28 typedef struct {
30  unsigned *video_offsets;
31  unsigned rdvo_offset;
32 } R3DContext;
33 
34 typedef struct {
35  unsigned size;
36  uint32_t tag;
37  uint64_t offset;
38 } Atom;
39 
40 static int read_atom(AVFormatContext *s, Atom *atom)
41 {
42  atom->offset = avio_tell(s->pb);
43  atom->size = avio_rb32(s->pb);
44  if (atom->size < 8)
45  return -1;
46  atom->tag = avio_rl32(s->pb);
47  av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
48  atom->size, (char*)&atom->tag, atom->offset);
49  return atom->size;
50 }
51 
53 {
55  char filename[258];
56  int tmp;
57  int av_unused tmp2;
58  AVRational framerate;
59 
60  if (!st)
61  return AVERROR(ENOMEM);
64 
65  tmp = avio_r8(s->pb); // major version
66  tmp2 = avio_r8(s->pb); // minor version
67  av_dlog(s, "version %d.%d\n", tmp, tmp2);
68 
69  tmp = avio_rb16(s->pb); // unknown
70  av_dlog(s, "unknown1 %d\n", tmp);
71 
72  tmp = avio_rb32(s->pb);
73  avpriv_set_pts_info(st, 32, 1, tmp);
74 
75  tmp = avio_rb32(s->pb); // filenum
76  av_dlog(s, "filenum %d\n", tmp);
77 
78  avio_skip(s->pb, 32); // unknown
79 
80  st->codec->width = avio_rb32(s->pb);
81  st->codec->height = avio_rb32(s->pb);
82 
83  tmp = avio_rb16(s->pb); // unknown
84  av_dlog(s, "unknown2 %d\n", tmp);
85 
86  framerate.num = avio_rb16(s->pb);
87  framerate.den = avio_rb16(s->pb);
88  if (framerate.num > 0 && framerate.den > 0) {
89  st->avg_frame_rate = framerate;
90  }
91 
92  tmp = avio_r8(s->pb); // audio channels
93  av_dlog(s, "audio channels %d\n", tmp);
94  if (tmp > 0) {
96  if (!ast)
97  return AVERROR(ENOMEM);
100  ast->codec->channels = tmp;
101  avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
102  }
103 
104  avio_read(s->pb, filename, 257);
105  filename[sizeof(filename)-1] = 0;
106  av_dict_set(&st->metadata, "filename", filename, 0);
107 
108  av_dlog(s, "filename %s\n", filename);
109  av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
110  av_dlog(s, "timescale %d\n", st->time_base.den);
111  av_dlog(s, "frame rate %d/%d\n",
112  framerate.num, framerate.den);
113 
114  return 0;
115 }
116 
117 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
118 {
119  R3DContext *r3d = s->priv_data;
120  AVStream *st = s->streams[0];
121  int i;
122 
123  r3d->video_offsets_count = (atom->size - 8) / 4;
124  r3d->video_offsets = av_malloc(atom->size);
125  if (!r3d->video_offsets)
126  return AVERROR(ENOMEM);
127 
128  for (i = 0; i < r3d->video_offsets_count; i++) {
129  r3d->video_offsets[i] = avio_rb32(s->pb);
130  if (!r3d->video_offsets[i]) {
131  r3d->video_offsets_count = i;
132  break;
133  }
134  av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
135  }
136 
137  if (st->avg_frame_rate.num)
140  st->avg_frame_rate.num},
141  st->time_base);
142  av_dlog(s, "duration %"PRId64"\n", st->duration);
143 
144  return 0;
145 }
146 
148 {
149  R3DContext *r3d = s->priv_data;
150  int av_unused tmp;
151 
152  r3d->rdvo_offset = avio_rb32(s->pb);
153  avio_rb32(s->pb); // rdvs offset
154  avio_rb32(s->pb); // rdao offset
155  avio_rb32(s->pb); // rdas offset
156 
157  tmp = avio_rb32(s->pb);
158  av_dlog(s, "num video chunks %d\n", tmp);
159 
160  tmp = avio_rb32(s->pb);
161  av_dlog(s, "num audio chunks %d\n", tmp);
162 
163  avio_skip(s->pb, 6*4);
164 }
165 
167 {
168  R3DContext *r3d = s->priv_data;
169  Atom atom;
170  int ret;
171 
172  if (read_atom(s, &atom) < 0) {
173  av_log(s, AV_LOG_ERROR, "error reading atom\n");
174  return -1;
175  }
176  if (atom.tag == MKTAG('R','E','D','1')) {
177  if ((ret = r3d_read_red1(s)) < 0) {
178  av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
179  return ret;
180  }
181  } else {
182  av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
183  return -1;
184  }
185 
186  s->data_offset = avio_tell(s->pb);
187  av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
188  if (!s->pb->seekable)
189  return 0;
190  // find REOB/REOF/REOS to load index
191  avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
192  if (read_atom(s, &atom) < 0)
193  av_log(s, AV_LOG_ERROR, "error reading end atom\n");
194 
195  if (atom.tag != MKTAG('R','E','O','B') &&
196  atom.tag != MKTAG('R','E','O','F') &&
197  atom.tag != MKTAG('R','E','O','S'))
198  goto out;
199 
200  r3d_read_reos(s);
201 
202  if (r3d->rdvo_offset) {
203  avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
204  if (read_atom(s, &atom) < 0)
205  av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
206  if (atom.tag == MKTAG('R','D','V','O')) {
207  if (r3d_read_rdvo(s, &atom) < 0)
208  av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
209  }
210  }
211 
212  out:
213  avio_seek(s->pb, s->data_offset, SEEK_SET);
214  return 0;
215 }
216 
217 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
218 {
219  AVStream *st = s->streams[0];
220  int tmp;
221  int av_unused tmp2;
222  uint64_t pos = avio_tell(s->pb);
223  unsigned dts;
224  int ret;
225 
226  dts = avio_rb32(s->pb);
227 
228  tmp = avio_rb32(s->pb);
229  av_dlog(s, "frame num %d\n", tmp);
230 
231  tmp = avio_r8(s->pb); // major version
232  tmp2 = avio_r8(s->pb); // minor version
233  av_dlog(s, "version %d.%d\n", tmp, tmp2);
234 
235  tmp = avio_rb16(s->pb); // unknown
236  av_dlog(s, "unknown %d\n", tmp);
237 
238  if (tmp > 4) {
239  tmp = avio_rb16(s->pb); // unknown
240  av_dlog(s, "unknown %d\n", tmp);
241 
242  tmp = avio_rb16(s->pb); // unknown
243  av_dlog(s, "unknown %d\n", tmp);
244 
245  tmp = avio_rb32(s->pb);
246  av_dlog(s, "width %d\n", tmp);
247  tmp = avio_rb32(s->pb);
248  av_dlog(s, "height %d\n", tmp);
249 
250  tmp = avio_rb32(s->pb);
251  av_dlog(s, "metadata len %d\n", tmp);
252  }
253  tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
254  if (tmp < 0)
255  return -1;
256  ret = av_get_packet(s->pb, pkt, tmp);
257  if (ret < 0) {
258  av_log(s, AV_LOG_ERROR, "error reading video packet\n");
259  return -1;
260  }
261 
262  pkt->stream_index = 0;
263  pkt->dts = dts;
264  if (st->avg_frame_rate.num)
265  pkt->duration = (uint64_t)st->time_base.den*
267  av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
268 
269  return 0;
270 }
271 
272 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
273 {
274  AVStream *st = s->streams[1];
275  int av_unused tmp, tmp2;
276  int samples, size;
277  uint64_t pos = avio_tell(s->pb);
278  unsigned dts;
279  int ret;
280 
281  dts = avio_rb32(s->pb);
282 
283  st->codec->sample_rate = avio_rb32(s->pb);
284  if (st->codec->sample_rate <= 0) {
285  av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
286  return AVERROR_INVALIDDATA;
287  }
288 
289  samples = avio_rb32(s->pb);
290 
291  tmp = avio_rb32(s->pb);
292  av_dlog(s, "packet num %d\n", tmp);
293 
294  tmp = avio_rb16(s->pb); // unknown
295  av_dlog(s, "unknown %d\n", tmp);
296 
297  tmp = avio_r8(s->pb); // major version
298  tmp2 = avio_r8(s->pb); // minor version
299  av_dlog(s, "version %d.%d\n", tmp, tmp2);
300 
301  tmp = avio_rb32(s->pb); // unknown
302  av_dlog(s, "unknown %d\n", tmp);
303 
304  size = atom->size - 8 - (avio_tell(s->pb) - pos);
305  if (size < 0)
306  return -1;
307  ret = av_get_packet(s->pb, pkt, size);
308  if (ret < 0) {
309  av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
310  return ret;
311  }
312 
313  pkt->stream_index = 1;
314  pkt->dts = dts;
315  pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
316  av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
317  pkt->dts, pkt->duration, samples, st->codec->sample_rate);
318 
319  return 0;
320 }
321 
323 {
324  Atom atom;
325  int err = 0;
326 
327  while (!err) {
328  if (read_atom(s, &atom) < 0) {
329  err = -1;
330  break;
331  }
332  switch (atom.tag) {
333  case MKTAG('R','E','D','V'):
334  if (s->streams[0]->discard == AVDISCARD_ALL)
335  goto skip;
336  if (!(err = r3d_read_redv(s, pkt, &atom)))
337  return 0;
338  break;
339  case MKTAG('R','E','D','A'):
340  if (s->nb_streams < 2)
341  return -1;
342  if (s->streams[1]->discard == AVDISCARD_ALL)
343  goto skip;
344  if (!(err = r3d_read_reda(s, pkt, &atom)))
345  return 0;
346  break;
347  default:
348  skip:
349  avio_skip(s->pb, atom.size-8);
350  }
351  }
352  return err;
353 }
354 
355 static int r3d_probe(AVProbeData *p)
356 {
357  if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
358  return AVPROBE_SCORE_MAX;
359  return 0;
360 }
361 
362 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
363 {
364  AVStream *st = s->streams[0]; // video stream
365  R3DContext *r3d = s->priv_data;
366  int frame_num;
367 
368  if (!st->avg_frame_rate.num)
369  return -1;
370 
371  frame_num = av_rescale_q(sample_time, st->time_base,
373  av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
374  frame_num, sample_time);
375 
376  if (frame_num < r3d->video_offsets_count) {
377  if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
378  return -1;
379  } else {
380  av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
381  return -1;
382  }
383 
384  return 0;
385 }
386 
388 {
389  R3DContext *r3d = s->priv_data;
390 
391  av_freep(&r3d->video_offsets);
392 
393  return 0;
394 }
395 
397  .name = "r3d",
398  .long_name = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
399  .priv_data_size = sizeof(R3DContext),
404  .read_seek = r3d_seek,
405 };