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rmdec.c
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1 /*
2  * "Real" compatible demuxer.
3  * Copyright (c) 2000, 2001 Fabrice Bellard
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 <inttypes.h>
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/dict.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "internal.h"
33 #include "rmsipr.h"
34 #include "rm.h"
35 
36 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/ATRAC
37 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
38 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
39 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
40 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
41 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
42 
43 struct RMStream {
44  AVPacket pkt; ///< place to store merged video frame / reordered audio data
45  int videobufsize; ///< current assembled frame size
46  int videobufpos; ///< position for the next slice in the video buffer
47  int curpic_num; ///< picture number of current frame
49  int64_t pktpos; ///< first slice position in file
50  /// Audio descrambling matrix parameters
51  int64_t audiotimestamp; ///< Audio packet timestamp
52  int sub_packet_cnt; // Subpacket counter, used while reading
53  int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
54  int audio_framesize; /// Audio frame size from container
55  int sub_packet_lengths[16]; /// Length of each subpacket
56  int32_t deint_id; ///< deinterleaver used in audio stream
57 };
58 
59 typedef struct {
64  int audio_stream_num; ///< Stream number for audio packets
65  int audio_pkt_cnt; ///< Output packet counter
67 
68 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
69 {
70  int i;
71  char *q, r;
72 
73  q = buf;
74  for(i=0;i<len;i++) {
75  r = avio_r8(pb);
76  if (i < buf_size - 1)
77  *q++ = r;
78  }
79  if (buf_size > 0) *q = '\0';
80 }
81 
82 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
83 {
84  get_strl(pb, buf, buf_size, avio_r8(pb));
85 }
86 
87 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
88 {
89  if (size >= 1<<24)
90  return -1;
91  if (ff_get_extradata(avctx, pb, size) < 0)
92  return AVERROR(ENOMEM);
93  return 0;
94 }
95 
96 static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)
97 {
98  char buf[1024];
99  int i;
100 
101  for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
102  int len = wide ? avio_rb16(pb) : avio_r8(pb);
103  get_strl(pb, buf, sizeof(buf), len);
104  av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
105  }
106 }
107 
109 {
110  RMStream *rms = av_mallocz(sizeof(RMStream));
111  rms->curpic_num = -1;
112  return rms;
113 }
114 
116 {
117  av_free_packet(&rms->pkt);
118 }
119 
121  AVStream *st, RMStream *ast, int read_all)
122 {
123  char buf[256];
124  uint32_t version;
125  int ret;
126 
127  /* ra type header */
128  version = avio_rb16(pb); /* version */
129  if (version == 3) {
130  unsigned bytes_per_minute;
131  int header_size = avio_rb16(pb);
132  int64_t startpos = avio_tell(pb);
133  avio_skip(pb, 8);
134  bytes_per_minute = avio_rb16(pb);
135  avio_skip(pb, 4);
136  rm_read_metadata(s, pb, 0);
137  if ((startpos + header_size) >= avio_tell(pb) + 2) {
138  // fourcc (should always be "lpcJ")
139  avio_r8(pb);
140  get_str8(pb, buf, sizeof(buf));
141  }
142  // Skip extra header crap (this should never happen)
143  if ((startpos + header_size) > avio_tell(pb))
144  avio_skip(pb, header_size + startpos - avio_tell(pb));
145  if (bytes_per_minute)
146  st->codec->bit_rate = 8LL * bytes_per_minute / 60;
147  st->codec->sample_rate = 8000;
148  st->codec->channels = 1;
152  ast->deint_id = DEINT_ID_INT0;
153  } else {
154  int flavor, sub_packet_h, coded_framesize, sub_packet_size;
155  int codecdata_length;
156  unsigned bytes_per_minute;
157  /* old version (4) */
158  avio_skip(pb, 2); /* unused */
159  avio_rb32(pb); /* .ra4 */
160  avio_rb32(pb); /* data size */
161  avio_rb16(pb); /* version2 */
162  avio_rb32(pb); /* header size */
163  flavor= avio_rb16(pb); /* add codec info / flavor */
164  ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
165  avio_rb32(pb); /* ??? */
166  bytes_per_minute = avio_rb32(pb);
167  if (version == 4) {
168  if (bytes_per_minute)
169  st->codec->bit_rate = 8LL * bytes_per_minute / 60;
170  }
171  avio_rb32(pb); /* ??? */
172  ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
173  st->codec->block_align= avio_rb16(pb); /* frame size */
174  ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
175  avio_rb16(pb); /* ??? */
176  if (version == 5) {
177  avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
178  }
179  st->codec->sample_rate = avio_rb16(pb);
180  avio_rb32(pb);
181  st->codec->channels = avio_rb16(pb);
182  if (version == 5) {
183  ast->deint_id = avio_rl32(pb);
184  avio_read(pb, buf, 4);
185  buf[4] = 0;
186  } else {
187  AV_WL32(buf, 0);
188  get_str8(pb, buf, sizeof(buf)); /* desc */
189  ast->deint_id = AV_RL32(buf);
190  get_str8(pb, buf, sizeof(buf)); /* desc */
191  }
193  st->codec->codec_tag = AV_RL32(buf);
195  st->codec->codec_tag);
196 
197  switch (st->codec->codec_id) {
198  case AV_CODEC_ID_AC3:
200  break;
201  case AV_CODEC_ID_RA_288:
202  st->codec->extradata_size= 0;
203  ast->audio_framesize = st->codec->block_align;
204  st->codec->block_align = coded_framesize;
205  break;
206  case AV_CODEC_ID_COOK:
208  case AV_CODEC_ID_ATRAC3:
209  case AV_CODEC_ID_SIPR:
210  if (read_all) {
211  codecdata_length = 0;
212  } else {
213  avio_rb16(pb); avio_r8(pb);
214  if (version == 5)
215  avio_r8(pb);
216  codecdata_length = avio_rb32(pb);
217  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
218  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
219  return -1;
220  }
221  }
222 
223  ast->audio_framesize = st->codec->block_align;
224  if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
225  if (flavor > 3) {
226  av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
227  flavor);
228  return -1;
229  }
230  st->codec->block_align = ff_sipr_subpk_size[flavor];
231  } else {
232  if(sub_packet_size <= 0){
233  av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
234  return -1;
235  }
236  st->codec->block_align = ast->sub_packet_size;
237  }
238  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
239  return ret;
240 
241  break;
242  case AV_CODEC_ID_AAC:
243  avio_rb16(pb); avio_r8(pb);
244  if (version == 5)
245  avio_r8(pb);
246  codecdata_length = avio_rb32(pb);
247  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
248  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
249  return -1;
250  }
251  if (codecdata_length >= 1) {
252  avio_r8(pb);
253  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
254  return ret;
255  }
256  break;
257  }
258  switch (ast->deint_id) {
259  case DEINT_ID_INT4:
260  if (ast->coded_framesize > ast->audio_framesize ||
261  sub_packet_h <= 1 ||
262  ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
263  return AVERROR_INVALIDDATA;
264  if (ast->coded_framesize * sub_packet_h != 2*ast->audio_framesize) {
265  avpriv_request_sample(s, "mismatching interleaver parameters");
266  return AVERROR_INVALIDDATA;
267  }
268  break;
269  case DEINT_ID_GENR:
270  if (ast->sub_packet_size <= 0 ||
271  ast->sub_packet_size > ast->audio_framesize)
272  return AVERROR_INVALIDDATA;
273  if (ast->audio_framesize % ast->sub_packet_size)
274  return AVERROR_INVALIDDATA;
275  break;
276  case DEINT_ID_SIPR:
277  case DEINT_ID_INT0:
278  case DEINT_ID_VBRS:
279  case DEINT_ID_VBRF:
280  break;
281  default:
282  av_log(s, AV_LOG_ERROR ,"Unknown interleaver %"PRIX32"\n", ast->deint_id);
283  return AVERROR_INVALIDDATA;
284  }
285  if (ast->deint_id == DEINT_ID_INT4 ||
286  ast->deint_id == DEINT_ID_GENR ||
287  ast->deint_id == DEINT_ID_SIPR) {
288  if (st->codec->block_align <= 0 ||
289  ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
290  ast->audio_framesize * sub_packet_h < st->codec->block_align)
291  return AVERROR_INVALIDDATA;
292  if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
293  return AVERROR(ENOMEM);
294  }
295 
296  if (read_all) {
297  avio_r8(pb);
298  avio_r8(pb);
299  avio_r8(pb);
300  rm_read_metadata(s, pb, 0);
301  }
302  }
303  return 0;
304 }
305 
306 int
308  AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)
309 {
310  unsigned int v;
311  int size;
312  int64_t codec_pos;
313  int ret;
314 
315  if (codec_data_size < 0)
316  return AVERROR_INVALIDDATA;
317 
318  avpriv_set_pts_info(st, 64, 1, 1000);
319  codec_pos = avio_tell(pb);
320  v = avio_rb32(pb);
321 
322  if (v == MKBETAG('M', 'L', 'T', 'I')) {
323  int number_of_streams = avio_rb16(pb);
324  int number_of_mdpr;
325  int i;
326  for (i = 0; i<number_of_streams; i++)
327  avio_rb16(pb);
328  number_of_mdpr = avio_rb16(pb);
329  if (number_of_mdpr != 1) {
330  avpriv_request_sample(s, "MLTI with multiple MDPR");
331  }
332  avio_rb32(pb);
333  v = avio_rb32(pb);
334  }
335 
336  if (v == MKTAG(0xfd, 'a', 'r', '.')) {
337  /* ra type header */
338  if (rm_read_audio_stream_info(s, pb, st, rst, 0))
339  return -1;
340  } else if (v == MKBETAG('L', 'S', 'D', ':')) {
341  avio_seek(pb, -4, SEEK_CUR);
342  if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
343  return ret;
344 
346  st->codec->codec_tag = AV_RL32(st->codec->extradata);
348  st->codec->codec_tag);
349  } else if(mime && !strcmp(mime, "logical-fileinfo")){
350  int stream_count, rule_count, property_count, i;
351  ff_free_stream(s, st);
352  if (avio_rb16(pb) != 0) {
353  av_log(s, AV_LOG_WARNING, "Unsupported version\n");
354  goto skip;
355  }
356  stream_count = avio_rb16(pb);
357  avio_skip(pb, 6*stream_count);
358  rule_count = avio_rb16(pb);
359  avio_skip(pb, 2*rule_count);
360  property_count = avio_rb16(pb);
361  for(i=0; i<property_count; i++){
362  uint8_t name[128], val[128];
363  avio_rb32(pb);
364  if (avio_rb16(pb) != 0) {
365  av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");
366  goto skip; //FIXME skip just this one
367  }
368  get_str8(pb, name, sizeof(name));
369  switch(avio_rb32(pb)) {
370  case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));
371  av_dict_set(&s->metadata, name, val, 0);
372  break;
373  default: avio_skip(pb, avio_rb16(pb));
374  }
375  }
376  } else {
377  int fps;
378  if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
379  fail1:
380  av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
381  goto skip;
382  }
383  st->codec->codec_tag = avio_rl32(pb);
385  st->codec->codec_tag);
386  av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
387  if (st->codec->codec_id == AV_CODEC_ID_NONE)
388  goto fail1;
389  st->codec->width = avio_rb16(pb);
390  st->codec->height = avio_rb16(pb);
391  avio_skip(pb, 2); // looks like bits per sample
392  avio_skip(pb, 4); // always zero?
395  fps = avio_rb32(pb);
396 
397  if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
398  return ret;
399 
400  if (fps > 0) {
402  0x10000, fps, (1 << 30) - 1);
403 #if FF_API_R_FRAME_RATE
404  st->r_frame_rate = st->avg_frame_rate;
405 #endif
406  } else if (s->error_recognition & AV_EF_EXPLODE) {
407  av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
408  return AVERROR_INVALIDDATA;
409  }
410  }
411 
412 skip:
413  /* skip codec info */
414  size = avio_tell(pb) - codec_pos;
415  avio_skip(pb, codec_data_size - size);
416 
417  return 0;
418 }
419 
420 /** this function assumes that the demuxer has already seeked to the start
421  * of the INDX chunk, and will bail out if not. */
423 {
424  AVIOContext *pb = s->pb;
425  unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
426  AVStream *st;
427 
428  do {
429  if (avio_rl32(pb) != MKTAG('I','N','D','X'))
430  return -1;
431  size = avio_rb32(pb);
432  if (size < 20)
433  return -1;
434  avio_skip(pb, 2);
435  n_pkts = avio_rb32(pb);
436  str_id = avio_rb16(pb);
437  next_off = avio_rb32(pb);
438  for (n = 0; n < s->nb_streams; n++)
439  if (s->streams[n]->id == str_id) {
440  st = s->streams[n];
441  break;
442  }
443  if (n == s->nb_streams) {
444  av_log(s, AV_LOG_ERROR,
445  "Invalid stream index %d for index at pos %"PRId64"\n",
446  str_id, avio_tell(pb));
447  goto skip;
448  } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
449  av_log(s, AV_LOG_ERROR,
450  "Nr. of packets in packet index for stream index %d "
451  "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
452  str_id, avio_size(pb), avio_tell(pb),
453  (avio_size(pb) - avio_tell(pb)) / 14);
454  goto skip;
455  }
456 
457  for (n = 0; n < n_pkts; n++) {
458  avio_skip(pb, 2);
459  pts = avio_rb32(pb);
460  pos = avio_rb32(pb);
461  avio_skip(pb, 4); /* packet no. */
462 
463  av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
464  }
465 
466 skip:
467  if (next_off && avio_tell(pb) < next_off &&
468  avio_seek(pb, next_off, SEEK_SET) < 0) {
469  av_log(s, AV_LOG_ERROR,
470  "Non-linear index detected, not supported\n");
471  return -1;
472  }
473  } while (next_off);
474 
475  return 0;
476 }
477 
479 {
480  RMDemuxContext *rm = s->priv_data;
481  AVStream *st;
482 
483  rm->old_format = 1;
484  st = avformat_new_stream(s, NULL);
485  if (!st)
486  return -1;
488  return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
489 }
490 
492 {
493  RMDemuxContext *rm = s->priv_data;
494  AVStream *st;
495  AVIOContext *pb = s->pb;
496  unsigned int tag;
497  int tag_size;
498  unsigned int start_time, duration;
499  unsigned int data_off = 0, indx_off = 0;
500  char buf[128], mime[128];
501  int flags = 0;
502 
503  tag = avio_rl32(pb);
504  if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
505  /* very old .ra format */
506  return rm_read_header_old(s);
507  } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
508  return AVERROR(EIO);
509  }
510 
511  tag_size = avio_rb32(pb);
512  avio_skip(pb, tag_size - 8);
513 
514  for(;;) {
515  if (avio_feof(pb))
516  return -1;
517  tag = avio_rl32(pb);
518  tag_size = avio_rb32(pb);
519  avio_rb16(pb);
520  av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
521  (tag ) & 0xff,
522  (tag >> 8) & 0xff,
523  (tag >> 16) & 0xff,
524  (tag >> 24) & 0xff,
525  tag,
526  tag_size);
527  if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
528  return -1;
529  switch(tag) {
530  case MKTAG('P', 'R', 'O', 'P'):
531  /* file header */
532  avio_rb32(pb); /* max bit rate */
533  avio_rb32(pb); /* avg bit rate */
534  avio_rb32(pb); /* max packet size */
535  avio_rb32(pb); /* avg packet size */
536  avio_rb32(pb); /* nb packets */
537  duration = avio_rb32(pb); /* duration */
538  s->duration = av_rescale(duration, AV_TIME_BASE, 1000);
539  avio_rb32(pb); /* preroll */
540  indx_off = avio_rb32(pb); /* index offset */
541  data_off = avio_rb32(pb); /* data offset */
542  avio_rb16(pb); /* nb streams */
543  flags = avio_rb16(pb); /* flags */
544  break;
545  case MKTAG('C', 'O', 'N', 'T'):
546  rm_read_metadata(s, pb, 1);
547  break;
548  case MKTAG('M', 'D', 'P', 'R'):
549  st = avformat_new_stream(s, NULL);
550  if (!st)
551  return AVERROR(ENOMEM);
552  st->id = avio_rb16(pb);
553  avio_rb32(pb); /* max bit rate */
554  st->codec->bit_rate = avio_rb32(pb); /* bit rate */
555  avio_rb32(pb); /* max packet size */
556  avio_rb32(pb); /* avg packet size */
557  start_time = avio_rb32(pb); /* start time */
558  avio_rb32(pb); /* preroll */
559  duration = avio_rb32(pb); /* duration */
560  st->start_time = start_time;
561  st->duration = duration;
562  if(duration>0)
564  get_str8(pb, buf, sizeof(buf)); /* desc */
565  get_str8(pb, mime, sizeof(mime)); /* mimetype */
568  if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
569  avio_rb32(pb), mime) < 0)
570  return -1;
571  break;
572  case MKTAG('D', 'A', 'T', 'A'):
573  goto header_end;
574  default:
575  /* unknown tag: skip it */
576  avio_skip(pb, tag_size - 10);
577  break;
578  }
579  }
580  header_end:
581  rm->nb_packets = avio_rb32(pb); /* number of packets */
582  if (!rm->nb_packets && (flags & 4))
583  rm->nb_packets = 3600 * 25;
584  avio_rb32(pb); /* next data header */
585 
586  if (!data_off)
587  data_off = avio_tell(pb) - 18;
588  if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
589  avio_seek(pb, indx_off, SEEK_SET) >= 0) {
590  rm_read_index(s);
591  avio_seek(pb, data_off + 18, SEEK_SET);
592  }
593 
594  return 0;
595 }
596 
597 static int get_num(AVIOContext *pb, int *len)
598 {
599  int n, n1;
600 
601  n = avio_rb16(pb);
602  (*len)-=2;
603  n &= 0x7FFF;
604  if (n >= 0x4000) {
605  return n - 0x4000;
606  } else {
607  n1 = avio_rb16(pb);
608  (*len)-=2;
609  return (n << 16) | n1;
610  }
611 }
612 
613 /* multiple of 20 bytes for ra144 (ugly) */
614 #define RAW_PACKET_SIZE 1000
615 
616 static int rm_sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
617  RMDemuxContext *rm = s->priv_data;
618  AVIOContext *pb = s->pb;
619  AVStream *st;
620  uint32_t state=0xFFFFFFFF;
621 
622  while(!avio_feof(pb)){
623  int len, num, i;
624  *pos= avio_tell(pb) - 3;
625  if(rm->remaining_len > 0){
626  num= rm->current_stream;
627  len= rm->remaining_len;
628  *timestamp = AV_NOPTS_VALUE;
629  *flags= 0;
630  }else{
631  state= (state<<8) + avio_r8(pb);
632 
633  if(state == MKBETAG('I', 'N', 'D', 'X')){
634  int n_pkts, expected_len;
635  len = avio_rb32(pb);
636  avio_skip(pb, 2);
637  n_pkts = avio_rb32(pb);
638  expected_len = 20 + n_pkts * 14;
639  if (len == 20)
640  /* some files don't add index entries to chunk size... */
641  len = expected_len;
642  else if (len != expected_len)
644  "Index size %d (%d pkts) is wrong, should be %d.\n",
645  len, n_pkts, expected_len);
646  len -= 14; // we already read part of the index header
647  if(len<0)
648  continue;
649  goto skip;
650  } else if (state == MKBETAG('D','A','T','A')) {
652  "DATA tag in middle of chunk, file may be broken.\n");
653  }
654 
655  if(state > (unsigned)0xFFFF || state <= 12)
656  continue;
657  len=state - 12;
658  state= 0xFFFFFFFF;
659 
660  num = avio_rb16(pb);
661  *timestamp = avio_rb32(pb);
662  avio_r8(pb); /* reserved */
663  *flags = avio_r8(pb); /* flags */
664  }
665  for(i=0;i<s->nb_streams;i++) {
666  st = s->streams[i];
667  if (num == st->id)
668  break;
669  }
670  if (i == s->nb_streams) {
671 skip:
672  /* skip packet if unknown number */
673  avio_skip(pb, len);
674  rm->remaining_len = 0;
675  continue;
676  }
677  *stream_index= i;
678 
679  return len;
680  }
681  return -1;
682 }
683 
685  RMDemuxContext *rm, RMStream *vst,
686  AVPacket *pkt, int len, int *pseq,
687  int64_t *timestamp)
688 {
689  int hdr;
690  int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silcense compiler warning
691  int type;
692  int ret;
693 
694  hdr = avio_r8(pb); len--;
695  type = hdr >> 6;
696 
697  if(type != 3){ // not frame as a part of packet
698  seq = avio_r8(pb); len--;
699  }
700  if(type != 1){ // not whole frame
701  len2 = get_num(pb, &len);
702  pos = get_num(pb, &len);
703  pic_num = avio_r8(pb); len--;
704  }
705  if(len<0) {
706  av_log(s, AV_LOG_ERROR, "Insufficient data\n");
707  return -1;
708  }
709  rm->remaining_len = len;
710  if(type&1){ // frame, not slice
711  if(type == 3){ // frame as a part of packet
712  len= len2;
713  *timestamp = pos;
714  }
715  if(rm->remaining_len < len) {
716  av_log(s, AV_LOG_ERROR, "Insufficient remaining len\n");
717  return -1;
718  }
719  rm->remaining_len -= len;
720  if(av_new_packet(pkt, len + 9) < 0)
721  return AVERROR(EIO);
722  pkt->data[0] = 0;
723  AV_WL32(pkt->data + 1, 1);
724  AV_WL32(pkt->data + 5, 0);
725  if ((ret = avio_read(pb, pkt->data + 9, len)) != len) {
726  av_free_packet(pkt);
727  av_log(s, AV_LOG_ERROR, "Failed to read %d bytes\n", len);
728  return ret < 0 ? ret : AVERROR(EIO);
729  }
730  return 0;
731  }
732  //now we have to deal with single slice
733 
734  *pseq = seq;
735  if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
736  if (len2 > ffio_limit(pb, len2)) {
737  av_log(s, AV_LOG_ERROR, "Impossibly sized packet\n");
738  return AVERROR_INVALIDDATA;
739  }
740  vst->slices = ((hdr & 0x3F) << 1) + 1;
741  vst->videobufsize = len2 + 8*vst->slices + 1;
742  av_free_packet(&vst->pkt); //FIXME this should be output.
743  if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
744  return AVERROR(ENOMEM);
745  memset(vst->pkt.data, 0, vst->pkt.size);
746  vst->videobufpos = 8*vst->slices + 1;
747  vst->cur_slice = 0;
748  vst->curpic_num = pic_num;
749  vst->pktpos = avio_tell(pb);
750  }
751  if(type == 2)
752  len = FFMIN(len, pos);
753 
754  if(++vst->cur_slice > vst->slices) {
755  av_log(s, AV_LOG_ERROR, "cur slice %d, too large\n", vst->cur_slice);
756  return 1;
757  }
758  if(!vst->pkt.data)
759  return AVERROR(ENOMEM);
760  AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
761  AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
762  if(vst->videobufpos + len > vst->videobufsize) {
763  av_log(s, AV_LOG_ERROR, "outside videobufsize\n");
764  return 1;
765  }
766  if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
767  return AVERROR(EIO);
768  vst->videobufpos += len;
769  rm->remaining_len-= len;
770 
771  if (type == 2 || vst->videobufpos == vst->videobufsize) {
772  vst->pkt.data[0] = vst->cur_slice-1;
773  *pkt= vst->pkt;
774  vst->pkt.data= NULL;
775  vst->pkt.size= 0;
776  vst->pkt.buf = NULL;
777 #if FF_API_DESTRUCT_PACKET
779  vst->pkt.destruct = NULL;
781 #endif
782  if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
783  memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
784  vst->videobufpos - 1 - 8*vst->slices);
785  pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
786  pkt->pts = AV_NOPTS_VALUE;
787  pkt->pos = vst->pktpos;
788  vst->slices = 0;
789  return 0;
790  }
791 
792  return 1;
793 }
794 
795 static inline void
797 {
798  uint8_t *ptr;
799  int j;
800 
801  if (st->codec->codec_id == AV_CODEC_ID_AC3) {
802  ptr = pkt->data;
803  for (j=0;j<pkt->size;j+=2) {
804  FFSWAP(int, ptr[0], ptr[1]);
805  ptr += 2;
806  }
807  }
808 }
809 
810 static int readfull(AVFormatContext *s, AVIOContext *pb, uint8_t *dst, int n) {
811  int ret = avio_read(pb, dst, n);
812  if (ret != n) {
813  if (ret >= 0) memset(dst + ret, 0, n - ret);
814  else memset(dst , 0, n);
815  av_log(s, AV_LOG_ERROR, "Failed to fully read block\n");
816  }
817  return ret;
818 }
819 
820 int
822  AVStream *st, RMStream *ast, int len, AVPacket *pkt,
823  int *seq, int flags, int64_t timestamp)
824 {
825  RMDemuxContext *rm = s->priv_data;
826  int ret;
827 
828  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
829  rm->current_stream= st->id;
830  ret = rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp);
831  if(ret)
832  return ret < 0 ? ret : -1; //got partial frame or error
833  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
834  if ((ast->deint_id == DEINT_ID_GENR) ||
835  (ast->deint_id == DEINT_ID_INT4) ||
836  (ast->deint_id == DEINT_ID_SIPR)) {
837  int x;
838  int sps = ast->sub_packet_size;
839  int cfs = ast->coded_framesize;
840  int h = ast->sub_packet_h;
841  int y = ast->sub_packet_cnt;
842  int w = ast->audio_framesize;
843 
844  if (flags & 2)
845  y = ast->sub_packet_cnt = 0;
846  if (!y)
847  ast->audiotimestamp = timestamp;
848 
849  switch (ast->deint_id) {
850  case DEINT_ID_INT4:
851  for (x = 0; x < h/2; x++)
852  readfull(s, pb, ast->pkt.data+x*2*w+y*cfs, cfs);
853  break;
854  case DEINT_ID_GENR:
855  for (x = 0; x < w/sps; x++)
856  readfull(s, pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
857  break;
858  case DEINT_ID_SIPR:
859  readfull(s, pb, ast->pkt.data + y * w, w);
860  break;
861  }
862 
863  if (++(ast->sub_packet_cnt) < h)
864  return -1;
865  if (ast->deint_id == DEINT_ID_SIPR)
866  ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
867 
868  ast->sub_packet_cnt = 0;
869  rm->audio_stream_num = st->index;
870  rm->audio_pkt_cnt = h * w / st->codec->block_align;
871  } else if ((ast->deint_id == DEINT_ID_VBRF) ||
872  (ast->deint_id == DEINT_ID_VBRS)) {
873  int x;
874  rm->audio_stream_num = st->index;
875  ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
876  if (ast->sub_packet_cnt) {
877  for (x = 0; x < ast->sub_packet_cnt; x++)
878  ast->sub_packet_lengths[x] = avio_rb16(pb);
879  rm->audio_pkt_cnt = ast->sub_packet_cnt;
880  ast->audiotimestamp = timestamp;
881  } else
882  return -1;
883  } else {
884  av_get_packet(pb, pkt, len);
885  rm_ac3_swap_bytes(st, pkt);
886  }
887  } else
888  av_get_packet(pb, pkt, len);
889 
890  pkt->stream_index = st->index;
891 
892 #if 0
893  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
894  if(st->codec->codec_id == AV_CODEC_ID_RV20){
895  int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
896  av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
897 
898  seq |= (timestamp&~0x3FFF);
899  if(seq - timestamp > 0x2000) seq -= 0x4000;
900  if(seq - timestamp < -0x2000) seq += 0x4000;
901  }
902  }
903 #endif
904 
905  pkt->pts = timestamp;
906  if (flags & 2)
907  pkt->flags |= AV_PKT_FLAG_KEY;
908 
909  return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
910 }
911 
912 int
914  AVStream *st, RMStream *ast, AVPacket *pkt)
915 {
916  RMDemuxContext *rm = s->priv_data;
917 
918  av_assert0 (rm->audio_pkt_cnt > 0);
919 
920  if (ast->deint_id == DEINT_ID_VBRF ||
921  ast->deint_id == DEINT_ID_VBRS)
923  else {
924  int ret = av_new_packet(pkt, st->codec->block_align);
925  if (ret < 0)
926  return ret;
927  memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
928  (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
929  st->codec->block_align);
930  }
931  rm->audio_pkt_cnt--;
932  if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
934  pkt->flags = AV_PKT_FLAG_KEY;
935  } else
936  pkt->flags = 0;
937  pkt->stream_index = st->index;
938 
939  return rm->audio_pkt_cnt;
940 }
941 
943 {
944  RMDemuxContext *rm = s->priv_data;
945  AVStream *st = NULL; // init to silence compiler warning
946  int i, len, res, seq = 1;
947  int64_t timestamp, pos;
948  int flags;
949 
950  for (;;) {
951  if (rm->audio_pkt_cnt) {
952  // If there are queued audio packet return them first
953  st = s->streams[rm->audio_stream_num];
954  res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
955  if(res < 0)
956  return res;
957  flags = 0;
958  } else {
959  if (rm->old_format) {
960  RMStream *ast;
961 
962  st = s->streams[0];
963  ast = st->priv_data;
964  timestamp = AV_NOPTS_VALUE;
965  len = !ast->audio_framesize ? RAW_PACKET_SIZE :
966  ast->coded_framesize * ast->sub_packet_h / 2;
967  flags = (seq++ == 1) ? 2 : 0;
968  pos = avio_tell(s->pb);
969  } else {
970  len = rm_sync(s, &timestamp, &flags, &i, &pos);
971  if (len > 0)
972  st = s->streams[i];
973  }
974 
975  if (len <= 0 || avio_feof(s->pb))
976  return AVERROR(EIO);
977 
978  res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
979  &seq, flags, timestamp);
980  if (res < -1)
981  return res;
982  if((flags&2) && (seq&0x7F) == 1)
983  av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
984  if (res)
985  continue;
986  }
987 
988  if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
989  || st->discard >= AVDISCARD_ALL){
990  av_free_packet(pkt);
991  } else
992  break;
993  }
994 
995  return 0;
996 }
997 
999 {
1000  int i;
1001 
1002  for (i=0;i<s->nb_streams;i++)
1004 
1005  return 0;
1006 }
1007 
1008 static int rm_probe(AVProbeData *p)
1009 {
1010  /* check file header */
1011  if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
1012  p->buf[2] == 'M' && p->buf[3] == 'F' &&
1013  p->buf[4] == 0 && p->buf[5] == 0) ||
1014  (p->buf[0] == '.' && p->buf[1] == 'r' &&
1015  p->buf[2] == 'a' && p->buf[3] == 0xfd))
1016  return AVPROBE_SCORE_MAX;
1017  else
1018  return 0;
1019 }
1020 
1021 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
1022  int64_t *ppos, int64_t pos_limit)
1023 {
1024  RMDemuxContext *rm = s->priv_data;
1025  int64_t pos, dts;
1026  int stream_index2, flags, len, h;
1027 
1028  pos = *ppos;
1029 
1030  if(rm->old_format)
1031  return AV_NOPTS_VALUE;
1032 
1033  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1034  return AV_NOPTS_VALUE;
1035 
1036  rm->remaining_len=0;
1037  for(;;){
1038  int seq=1;
1039  AVStream *st;
1040 
1041  len = rm_sync(s, &dts, &flags, &stream_index2, &pos);
1042  if(len<0)
1043  return AV_NOPTS_VALUE;
1044 
1045  st = s->streams[stream_index2];
1046  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1047  h= avio_r8(s->pb); len--;
1048  if(!(h & 0x40)){
1049  seq = avio_r8(s->pb); len--;
1050  }
1051  }
1052 
1053  if((flags&2) && (seq&0x7F) == 1){
1054  av_dlog(s, "%d %d-%d %"PRId64" %d\n",
1055  flags, stream_index2, stream_index, dts, seq);
1056  av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
1057  if(stream_index2 == stream_index)
1058  break;
1059  }
1060 
1061  avio_skip(s->pb, len);
1062  }
1063  *ppos = pos;
1064  return dts;
1065 }
1066 
1067 static int rm_read_seek(AVFormatContext *s, int stream_index,
1068  int64_t pts, int flags)
1069 {
1070  RMDemuxContext *rm = s->priv_data;
1071 
1072  if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1073  return -1;
1074  rm->audio_pkt_cnt = 0;
1075  return 0;
1076 }
1077 
1078 
1080  .name = "rm",
1081  .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
1082  .priv_data_size = sizeof(RMDemuxContext),
1083  .read_probe = rm_probe,
1087  .read_timestamp = rm_read_dts,
1089 };
1090 
1092  .name = "rdt",
1093  .long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
1094  .priv_data_size = sizeof(RMDemuxContext),
1096  .flags = AVFMT_NOFILE,
1097 };