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 //#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  AVRational framerate;
61 
62  if (!st)
63  return AVERROR(ENOMEM);
66 
67  tmp = avio_r8(s->pb); // major version
68  tmp2 = avio_r8(s->pb); // minor version
69  av_dlog(s, "version %d.%d\n", tmp, tmp2);
70 
71  tmp = avio_rb16(s->pb); // unknown
72  av_dlog(s, "unknown1 %d\n", tmp);
73 
74  tmp = avio_rb32(s->pb);
75  avpriv_set_pts_info(st, 32, 1, tmp);
76 
77  tmp = avio_rb32(s->pb); // filenum
78  av_dlog(s, "filenum %d\n", tmp);
79 
80  avio_skip(s->pb, 32); // unknown
81 
82  st->codec->width = avio_rb32(s->pb);
83  st->codec->height = avio_rb32(s->pb);
84 
85  tmp = avio_rb16(s->pb); // unknown
86  av_dlog(s, "unknown2 %d\n", tmp);
87 
88  framerate.num = avio_rb16(s->pb);
89  framerate.den = avio_rb16(s->pb);
90  if (framerate.num > 0 && framerate.den > 0) {
91 #if FF_API_R_FRAME_RATE
92  st->r_frame_rate =
93 #endif
94  st->avg_frame_rate = framerate;
95  }
96 
97  tmp = avio_r8(s->pb); // audio channels
98  av_dlog(s, "audio channels %d\n", tmp);
99  if (tmp > 0) {
100  AVStream *ast = avformat_new_stream(s, NULL);
101  if (!ast)
102  return AVERROR(ENOMEM);
105  ast->codec->channels = tmp;
106  avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
107  }
108 
109  avio_read(s->pb, filename, 257);
110  filename[sizeof(filename)-1] = 0;
111  av_dict_set(&st->metadata, "filename", filename, 0);
112 
113  av_dlog(s, "filename %s\n", filename);
114  av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
115  av_dlog(s, "timescale %d\n", st->time_base.den);
116  av_dlog(s, "frame rate %d/%d\n",
117  framerate.num, framerate.den);
118 
119  return 0;
120 }
121 
122 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
123 {
124  R3DContext *r3d = s->priv_data;
125  AVStream *st = s->streams[0];
126  int i;
127 
128  r3d->video_offsets_count = (atom->size - 8) / 4;
129  r3d->video_offsets = av_malloc(atom->size);
130  if (!r3d->video_offsets)
131  return AVERROR(ENOMEM);
132 
133  for (i = 0; i < r3d->video_offsets_count; i++) {
134  r3d->video_offsets[i] = avio_rb32(s->pb);
135  if (!r3d->video_offsets[i]) {
136  r3d->video_offsets_count = i;
137  break;
138  }
139  av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
140  }
141 
142  if (st->avg_frame_rate.num)
145  st->avg_frame_rate.num},
146  st->time_base);
147  av_dlog(s, "duration %"PRId64"\n", st->duration);
148 
149  return 0;
150 }
151 
153 {
154  R3DContext *r3d = s->priv_data;
155  int av_unused tmp;
156 
157  r3d->rdvo_offset = avio_rb32(s->pb);
158  avio_rb32(s->pb); // rdvs offset
159  avio_rb32(s->pb); // rdao offset
160  avio_rb32(s->pb); // rdas offset
161 
162  tmp = avio_rb32(s->pb);
163  av_dlog(s, "num video chunks %d\n", tmp);
164 
165  tmp = avio_rb32(s->pb);
166  av_dlog(s, "num audio chunks %d\n", tmp);
167 
168  avio_skip(s->pb, 6*4);
169 }
170 
172 {
173  R3DContext *r3d = s->priv_data;
174  Atom atom;
175  int ret;
176 
177  if (read_atom(s, &atom) < 0) {
178  av_log(s, AV_LOG_ERROR, "error reading atom\n");
179  return -1;
180  }
181  if (atom.tag == MKTAG('R','E','D','1')) {
182  if ((ret = r3d_read_red1(s)) < 0) {
183  av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
184  return ret;
185  }
186  } else {
187  av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
188  return -1;
189  }
190 
191  s->data_offset = avio_tell(s->pb);
192  av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
193  if (!s->pb->seekable)
194  return 0;
195  // find REOB/REOF/REOS to load index
196  avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
197  if (read_atom(s, &atom) < 0)
198  av_log(s, AV_LOG_ERROR, "error reading end atom\n");
199 
200  if (atom.tag != MKTAG('R','E','O','B') &&
201  atom.tag != MKTAG('R','E','O','F') &&
202  atom.tag != MKTAG('R','E','O','S'))
203  goto out;
204 
205  r3d_read_reos(s);
206 
207  if (r3d->rdvo_offset) {
208  avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
209  if (read_atom(s, &atom) < 0)
210  av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
211  if (atom.tag == MKTAG('R','D','V','O')) {
212  if (r3d_read_rdvo(s, &atom) < 0)
213  av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
214  }
215  }
216 
217  out:
218  avio_seek(s->pb, s->data_offset, SEEK_SET);
219  return 0;
220 }
221 
222 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
223 {
224  AVStream *st = s->streams[0];
225  int tmp;
226  int av_unused tmp2;
227  uint64_t pos = avio_tell(s->pb);
228  unsigned dts;
229  int ret;
230 
231  dts = avio_rb32(s->pb);
232 
233  tmp = avio_rb32(s->pb);
234  av_dlog(s, "frame num %d\n", tmp);
235 
236  tmp = avio_r8(s->pb); // major version
237  tmp2 = avio_r8(s->pb); // minor version
238  av_dlog(s, "version %d.%d\n", tmp, tmp2);
239 
240  tmp = avio_rb16(s->pb); // unknown
241  av_dlog(s, "unknown %d\n", tmp);
242 
243  if (tmp > 4) {
244  tmp = avio_rb16(s->pb); // unknown
245  av_dlog(s, "unknown %d\n", tmp);
246 
247  tmp = avio_rb16(s->pb); // unknown
248  av_dlog(s, "unknown %d\n", tmp);
249 
250  tmp = avio_rb32(s->pb);
251  av_dlog(s, "width %d\n", tmp);
252  tmp = avio_rb32(s->pb);
253  av_dlog(s, "height %d\n", tmp);
254 
255  tmp = avio_rb32(s->pb);
256  av_dlog(s, "metadata len %d\n", tmp);
257  }
258  tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
259  if (tmp < 0)
260  return -1;
261  ret = av_get_packet(s->pb, pkt, tmp);
262  if (ret < 0) {
263  av_log(s, AV_LOG_ERROR, "error reading video packet\n");
264  return -1;
265  }
266 
267  pkt->stream_index = 0;
268  pkt->dts = dts;
269  if (st->avg_frame_rate.num)
270  pkt->duration = (uint64_t)st->time_base.den*
272  av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
273 
274  return 0;
275 }
276 
277 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
278 {
279  AVStream *st = s->streams[1];
280  int av_unused tmp, tmp2;
281  int samples, size;
282  uint64_t pos = avio_tell(s->pb);
283  unsigned dts;
284  int ret;
285 
286  dts = avio_rb32(s->pb);
287 
288  st->codec->sample_rate = avio_rb32(s->pb);
289  if (st->codec->sample_rate <= 0) {
290  av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
291  return AVERROR_INVALIDDATA;
292  }
293 
294  samples = avio_rb32(s->pb);
295 
296  tmp = avio_rb32(s->pb);
297  av_dlog(s, "packet num %d\n", tmp);
298 
299  tmp = avio_rb16(s->pb); // unknown
300  av_dlog(s, "unknown %d\n", tmp);
301 
302  tmp = avio_r8(s->pb); // major version
303  tmp2 = avio_r8(s->pb); // minor version
304  av_dlog(s, "version %d.%d\n", tmp, tmp2);
305 
306  tmp = avio_rb32(s->pb); // unknown
307  av_dlog(s, "unknown %d\n", tmp);
308 
309  size = atom->size - 8 - (avio_tell(s->pb) - pos);
310  if (size < 0)
311  return -1;
312  ret = av_get_packet(s->pb, pkt, size);
313  if (ret < 0) {
314  av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
315  return ret;
316  }
317 
318  pkt->stream_index = 1;
319  pkt->dts = dts;
320  pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
321  av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
322  pkt->dts, pkt->duration, samples, st->codec->sample_rate);
323 
324  return 0;
325 }
326 
328 {
329  Atom atom;
330  int err = 0;
331 
332  while (!err) {
333  if (read_atom(s, &atom) < 0) {
334  err = -1;
335  break;
336  }
337  switch (atom.tag) {
338  case MKTAG('R','E','D','V'):
339  if (s->streams[0]->discard == AVDISCARD_ALL)
340  goto skip;
341  if (!(err = r3d_read_redv(s, pkt, &atom)))
342  return 0;
343  break;
344  case MKTAG('R','E','D','A'):
345  if (s->nb_streams < 2)
346  return -1;
347  if (s->streams[1]->discard == AVDISCARD_ALL)
348  goto skip;
349  if (!(err = r3d_read_reda(s, pkt, &atom)))
350  return 0;
351  break;
352  default:
353  skip:
354  avio_skip(s->pb, atom.size-8);
355  }
356  }
357  return err;
358 }
359 
360 static int r3d_probe(AVProbeData *p)
361 {
362  if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
363  return AVPROBE_SCORE_MAX;
364  return 0;
365 }
366 
367 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
368 {
369  AVStream *st = s->streams[0]; // video stream
370  R3DContext *r3d = s->priv_data;
371  int frame_num;
372 
373  if (!st->avg_frame_rate.num)
374  return -1;
375 
376  frame_num = av_rescale_q(sample_time, st->time_base,
378  av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
379  frame_num, sample_time);
380 
381  if (frame_num < r3d->video_offsets_count) {
382  if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
383  return -1;
384  } else {
385  av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
386  return -1;
387  }
388 
389  return 0;
390 }
391 
393 {
394  R3DContext *r3d = s->priv_data;
395 
396  av_freep(&r3d->video_offsets);
397 
398  return 0;
399 }
400 
402  .name = "r3d",
403  .long_name = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
404  .priv_data_size = sizeof(R3DContext),
409  .read_seek = r3d_seek,
410 };