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 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/avstring.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "rmsipr.h"
29 #include "rm.h"
30 
31 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r')
32 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0')
33 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4')
34 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r')
35 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f')
36 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's')
37 
38 struct RMStream {
42  int curpic_num;
44  int64_t pktpos;
45 
46  int64_t audiotimestamp;
47  int sub_packet_cnt; // Subpacket counter, used while reading
52 };
53 
54 typedef struct {
62 
63 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
64 {
65  int i;
66  char *q, r;
67 
68  q = buf;
69  for(i=0;i<len;i++) {
70  r = avio_r8(pb);
71  if (i < buf_size - 1)
72  *q++ = r;
73  }
74  if (buf_size > 0) *q = '\0';
75 }
76 
77 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
78 {
79  get_strl(pb, buf, buf_size, avio_r8(pb));
80 }
81 
82 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
83 {
84  if (size >= 1<<24)
85  return -1;
87  if (!avctx->extradata)
88  return AVERROR(ENOMEM);
89  avctx->extradata_size = avio_read(pb, avctx->extradata, size);
90  memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
91  if (avctx->extradata_size != size)
92  return AVERROR(EIO);
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  for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
101  int len = wide ? avio_rb16(pb) : avio_r8(pb);
102  get_strl(pb, buf, sizeof(buf), len);
103  av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
104  }
105 }
106 
108 {
109  RMStream *rms = av_mallocz(sizeof(RMStream));
110  rms->curpic_num = -1;
111  return rms;
112 }
113 
115 {
116  av_free_packet(&rms->pkt);
117 }
118 
120  AVStream *st, RMStream *ast, int read_all)
121 {
122  char buf[256];
123  uint32_t version;
124  int ret;
125 
126  /* ra type header */
127  version = avio_rb16(pb); /* version */
128  if (version == 3) {
129  int header_size = avio_rb16(pb);
130  int64_t startpos = avio_tell(pb);
131  avio_skip(pb, 14);
132  rm_read_metadata(s, pb, 0);
133  if ((startpos + header_size) >= avio_tell(pb) + 2) {
134  // fourcc (should always be "lpcJ")
135  avio_r8(pb);
136  get_str8(pb, buf, sizeof(buf));
137  }
138  // Skip extra header crap (this should never happen)
139  if ((startpos + header_size) > avio_tell(pb))
140  avio_skip(pb, header_size + startpos - avio_tell(pb));
141  st->codec->sample_rate = 8000;
142  st->codec->channels = 1;
146  ast->deint_id = DEINT_ID_INT0;
147  } else {
148  int flavor, sub_packet_h, coded_framesize, sub_packet_size;
149  int codecdata_length;
150  /* old version (4) */
151  avio_skip(pb, 2); /* unused */
152  avio_rb32(pb); /* .ra4 */
153  avio_rb32(pb); /* data size */
154  avio_rb16(pb); /* version2 */
155  avio_rb32(pb); /* header size */
156  flavor= avio_rb16(pb); /* add codec info / flavor */
157  ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
158  avio_rb32(pb); /* ??? */
159  avio_rb32(pb); /* ??? */
160  avio_rb32(pb); /* ??? */
161  ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
162  st->codec->block_align= avio_rb16(pb); /* frame size */
163  ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
164  avio_rb16(pb); /* ??? */
165  if (version == 5) {
166  avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
167  }
168  st->codec->sample_rate = avio_rb16(pb);
169  avio_rb32(pb);
170  st->codec->channels = avio_rb16(pb);
171  if (version == 5) {
172  ast->deint_id = avio_rl32(pb);
173  avio_read(pb, buf, 4);
174  buf[4] = 0;
175  } else {
176  get_str8(pb, buf, sizeof(buf)); /* desc */
177  ast->deint_id = AV_RL32(buf);
178  get_str8(pb, buf, sizeof(buf)); /* desc */
179  }
181  st->codec->codec_tag = AV_RL32(buf);
183  st->codec->codec_tag);
184 
185  switch (st->codec->codec_id) {
186  case AV_CODEC_ID_AC3:
188  break;
189  case AV_CODEC_ID_RA_288:
190  st->codec->extradata_size= 0;
191  ast->audio_framesize = st->codec->block_align;
192  st->codec->block_align = coded_framesize;
193  break;
194  case AV_CODEC_ID_COOK:
196  case AV_CODEC_ID_ATRAC3:
197  case AV_CODEC_ID_SIPR:
198  avio_rb16(pb); avio_r8(pb);
199  if (version == 5)
200  avio_r8(pb);
201  codecdata_length = avio_rb32(pb);
202  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
203  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
204  return -1;
205  }
206 
207  ast->audio_framesize = st->codec->block_align;
208  if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
209  if (flavor > 3) {
210  av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
211  flavor);
212  return -1;
213  }
214  st->codec->block_align = ff_sipr_subpk_size[flavor];
215  } else {
216  if(sub_packet_size <= 0){
217  av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
218  return -1;
219  }
220  st->codec->block_align = ast->sub_packet_size;
221  }
222  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
223  return ret;
224  break;
225  case AV_CODEC_ID_AAC:
226  avio_rb16(pb); avio_r8(pb);
227  if (version == 5)
228  avio_r8(pb);
229  codecdata_length = avio_rb32(pb);
230  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
231  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
232  return -1;
233  }
234  if (codecdata_length >= 1) {
235  avio_r8(pb);
236  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
237  return ret;
238  }
239  break;
240  default:
241  av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
242  }
243  if (ast->deint_id == DEINT_ID_INT4 ||
244  ast->deint_id == DEINT_ID_GENR ||
245  ast->deint_id == DEINT_ID_SIPR) {
246  if (st->codec->block_align <= 0 ||
247  ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
248  ast->audio_framesize * sub_packet_h < st->codec->block_align)
249  return AVERROR_INVALIDDATA;
250  if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
251  return AVERROR(ENOMEM);
252  }
253  switch (ast->deint_id) {
254  case DEINT_ID_INT4:
255  if (ast->coded_framesize > ast->audio_framesize ||
256  sub_packet_h <= 1 ||
257  ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
258  return AVERROR_INVALIDDATA;
259  break;
260  case DEINT_ID_GENR:
261  if (ast->sub_packet_size <= 0 ||
262  ast->sub_packet_size > ast->audio_framesize)
263  return AVERROR_INVALIDDATA;
264  break;
265  case DEINT_ID_SIPR:
266  case DEINT_ID_INT0:
267  case DEINT_ID_VBRS:
268  case DEINT_ID_VBRF:
269  break;
270  default:
271  av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
272  return AVERROR_INVALIDDATA;
273  }
274 
275  if (read_all) {
276  avio_r8(pb);
277  avio_r8(pb);
278  avio_r8(pb);
279  rm_read_metadata(s, pb, 0);
280  }
281  }
282  return 0;
283 }
284 
285 int
287  AVStream *st, RMStream *rst, int codec_data_size)
288 {
289  unsigned int v;
290  int size;
291  int64_t codec_pos;
292  int ret;
293 
294  avpriv_set_pts_info(st, 64, 1, 1000);
295  codec_pos = avio_tell(pb);
296  v = avio_rb32(pb);
297  if (v == MKTAG(0xfd, 'a', 'r', '.')) {
298  /* ra type header */
299  if (rm_read_audio_stream_info(s, pb, st, rst, 0))
300  return -1;
301  } else if (v == MKBETAG('L', 'S', 'D', ':')) {
302  avio_seek(pb, -4, SEEK_CUR);
303  if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
304  return ret;
305 
307  st->codec->codec_tag = AV_RL32(st->codec->extradata);
309  st->codec->codec_tag);
310  } else {
311  int fps;
312  if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
313  fail1:
314  av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
315  goto skip;
316  }
317  st->codec->codec_tag = avio_rl32(pb);
319  st->codec->codec_tag);
320  av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
321  if (st->codec->codec_id == AV_CODEC_ID_NONE)
322  goto fail1;
323  st->codec->width = avio_rb16(pb);
324  st->codec->height = avio_rb16(pb);
325  avio_skip(pb, 2); // looks like bits per sample
326  avio_skip(pb, 4); // always zero?
329  fps = avio_rb32(pb);
330 
331  if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
332  return ret;
333 
334  if (fps > 0) {
336  0x10000, fps, (1 << 30) - 1);
337  } else if (s->error_recognition & AV_EF_EXPLODE) {
338  av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
339  return AVERROR_INVALIDDATA;
340  }
341 #if FF_API_R_FRAME_RATE
342  st->r_frame_rate = st->avg_frame_rate;
343 #endif
344  }
345 
346 skip:
347  /* skip codec info */
348  size = avio_tell(pb) - codec_pos;
349  avio_skip(pb, codec_data_size - size);
350 
351  return 0;
352 }
353 
357 {
358  AVIOContext *pb = s->pb;
359  unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
360  AVStream *st;
361 
362  do {
363  if (avio_rl32(pb) != MKTAG('I','N','D','X'))
364  return -1;
365  size = avio_rb32(pb);
366  if (size < 20)
367  return -1;
368  avio_skip(pb, 2);
369  n_pkts = avio_rb32(pb);
370  str_id = avio_rb16(pb);
371  next_off = avio_rb32(pb);
372  for (n = 0; n < s->nb_streams; n++)
373  if (s->streams[n]->id == str_id) {
374  st = s->streams[n];
375  break;
376  }
377  if (n == s->nb_streams) {
378  av_log(s, AV_LOG_ERROR,
379  "Invalid stream index %d for index at pos %"PRId64"\n",
380  str_id, avio_tell(pb));
381  goto skip;
382  } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
383  av_log(s, AV_LOG_ERROR,
384  "Nr. of packets in packet index for stream index %d "
385  "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
386  str_id, avio_size(pb), avio_tell(pb),
387  (avio_size(pb) - avio_tell(pb)) / 14);
388  goto skip;
389  }
390 
391  for (n = 0; n < n_pkts; n++) {
392  avio_skip(pb, 2);
393  pts = avio_rb32(pb);
394  pos = avio_rb32(pb);
395  avio_skip(pb, 4); /* packet no. */
396 
397  av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
398  }
399 
400 skip:
401  if (next_off && avio_tell(pb) < next_off &&
402  avio_seek(pb, next_off, SEEK_SET) < 0) {
403  av_log(s, AV_LOG_ERROR,
404  "Non-linear index detected, not supported\n");
405  return -1;
406  }
407  } while (next_off);
408 
409  return 0;
410 }
411 
413 {
414  RMDemuxContext *rm = s->priv_data;
415  AVStream *st;
416 
417  rm->old_format = 1;
418  st = avformat_new_stream(s, NULL);
419  if (!st)
420  return -1;
422  return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
423 }
424 
426 {
427  RMDemuxContext *rm = s->priv_data;
428  AVStream *st;
429  AVIOContext *pb = s->pb;
430  unsigned int tag;
431  int tag_size;
432  unsigned int start_time, duration;
433  unsigned int data_off = 0, indx_off = 0;
434  char buf[128];
435  int flags = 0;
436 
437  tag = avio_rl32(pb);
438  if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
439  /* very old .ra format */
440  return rm_read_header_old(s);
441  } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
442  return AVERROR(EIO);
443  }
444 
445  tag_size = avio_rb32(pb);
446  avio_skip(pb, tag_size - 8);
447 
448  for(;;) {
449  if (pb->eof_reached)
450  return -1;
451  tag = avio_rl32(pb);
452  tag_size = avio_rb32(pb);
453  avio_rb16(pb);
454  av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
455  (tag ) & 0xff,
456  (tag >> 8) & 0xff,
457  (tag >> 16) & 0xff,
458  (tag >> 24) & 0xff,
459  tag,
460  tag_size);
461  if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
462  return -1;
463  switch(tag) {
464  case MKTAG('P', 'R', 'O', 'P'):
465  /* file header */
466  avio_rb32(pb); /* max bit rate */
467  avio_rb32(pb); /* avg bit rate */
468  avio_rb32(pb); /* max packet size */
469  avio_rb32(pb); /* avg packet size */
470  avio_rb32(pb); /* nb packets */
471  avio_rb32(pb); /* duration */
472  avio_rb32(pb); /* preroll */
473  indx_off = avio_rb32(pb); /* index offset */
474  data_off = avio_rb32(pb); /* data offset */
475  avio_rb16(pb); /* nb streams */
476  flags = avio_rb16(pb); /* flags */
477  break;
478  case MKTAG('C', 'O', 'N', 'T'):
479  rm_read_metadata(s, pb, 1);
480  break;
481  case MKTAG('M', 'D', 'P', 'R'):
482  st = avformat_new_stream(s, NULL);
483  if (!st)
484  return AVERROR(ENOMEM);
485  st->id = avio_rb16(pb);
486  avio_rb32(pb); /* max bit rate */
487  st->codec->bit_rate = avio_rb32(pb); /* bit rate */
488  avio_rb32(pb); /* max packet size */
489  avio_rb32(pb); /* avg packet size */
490  start_time = avio_rb32(pb); /* start time */
491  avio_rb32(pb); /* preroll */
492  duration = avio_rb32(pb); /* duration */
493  st->start_time = start_time;
494  st->duration = duration;
495  get_str8(pb, buf, sizeof(buf)); /* desc */
496  get_str8(pb, buf, sizeof(buf)); /* mimetype */
499  if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
500  avio_rb32(pb)) < 0)
501  return -1;
502  break;
503  case MKTAG('D', 'A', 'T', 'A'):
504  goto header_end;
505  default:
506  /* unknown tag: skip it */
507  avio_skip(pb, tag_size - 10);
508  break;
509  }
510  }
511  header_end:
512  rm->nb_packets = avio_rb32(pb); /* number of packets */
513  if (!rm->nb_packets && (flags & 4))
514  rm->nb_packets = 3600 * 25;
515  avio_rb32(pb); /* next data header */
516 
517  if (!data_off)
518  data_off = avio_tell(pb) - 18;
519  if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
520  avio_seek(pb, indx_off, SEEK_SET) >= 0) {
521  rm_read_index(s);
522  avio_seek(pb, data_off + 18, SEEK_SET);
523  }
524 
525  return 0;
526 }
527 
528 static int get_num(AVIOContext *pb, int *len)
529 {
530  int n, n1;
531 
532  n = avio_rb16(pb);
533  (*len)-=2;
534  n &= 0x7FFF;
535  if (n >= 0x4000) {
536  return n - 0x4000;
537  } else {
538  n1 = avio_rb16(pb);
539  (*len)-=2;
540  return (n << 16) | n1;
541  }
542 }
543 
544 /* multiple of 20 bytes for ra144 (ugly) */
545 #define RAW_PACKET_SIZE 1000
546 
547 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
548  RMDemuxContext *rm = s->priv_data;
549  AVIOContext *pb = s->pb;
550  AVStream *st;
551  uint32_t state=0xFFFFFFFF;
552 
553  while(!pb->eof_reached){
554  int len, num, i;
555  *pos= avio_tell(pb) - 3;
556  if(rm->remaining_len > 0){
557  num= rm->current_stream;
558  len= rm->remaining_len;
559  *timestamp = AV_NOPTS_VALUE;
560  *flags= 0;
561  }else{
562  state= (state<<8) + avio_r8(pb);
563 
564  if(state == MKBETAG('I', 'N', 'D', 'X')){
565  int n_pkts, expected_len;
566  len = avio_rb32(pb);
567  avio_skip(pb, 2);
568  n_pkts = avio_rb32(pb);
569  expected_len = 20 + n_pkts * 14;
570  if (len == 20)
571  /* some files don't add index entries to chunk size... */
572  len = expected_len;
573  else if (len != expected_len)
575  "Index size %d (%d pkts) is wrong, should be %d.\n",
576  len, n_pkts, expected_len);
577  len -= 14; // we already read part of the index header
578  if(len<0)
579  continue;
580  goto skip;
581  } else if (state == MKBETAG('D','A','T','A')) {
583  "DATA tag in middle of chunk, file may be broken.\n");
584  }
585 
586  if(state > (unsigned)0xFFFF || state <= 12)
587  continue;
588  len=state - 12;
589  state= 0xFFFFFFFF;
590 
591  num = avio_rb16(pb);
592  *timestamp = avio_rb32(pb);
593  avio_r8(pb); /* reserved */
594  *flags = avio_r8(pb); /* flags */
595  }
596  for(i=0;i<s->nb_streams;i++) {
597  st = s->streams[i];
598  if (num == st->id)
599  break;
600  }
601  if (i == s->nb_streams) {
602 skip:
603  /* skip packet if unknown number */
604  avio_skip(pb, len);
605  rm->remaining_len = 0;
606  continue;
607  }
608  *stream_index= i;
609 
610  return len;
611  }
612  return -1;
613 }
614 
616  RMDemuxContext *rm, RMStream *vst,
617  AVPacket *pkt, int len, int *pseq,
618  int64_t *timestamp)
619 {
620  int hdr, seq, pic_num, len2, pos;
621  int type;
622 
623  hdr = avio_r8(pb); len--;
624  type = hdr >> 6;
625 
626  if(type != 3){ // not frame as a part of packet
627  seq = avio_r8(pb); len--;
628  }
629  if(type != 1){ // not whole frame
630  len2 = get_num(pb, &len);
631  pos = get_num(pb, &len);
632  pic_num = avio_r8(pb); len--;
633  }
634  if(len<0)
635  return -1;
636  rm->remaining_len = len;
637  if(type&1){ // frame, not slice
638  if(type == 3){ // frame as a part of packet
639  len= len2;
640  *timestamp = pos;
641  }
642  if(rm->remaining_len < len)
643  return -1;
644  rm->remaining_len -= len;
645  if(av_new_packet(pkt, len + 9) < 0)
646  return AVERROR(EIO);
647  pkt->data[0] = 0;
648  AV_WL32(pkt->data + 1, 1);
649  AV_WL32(pkt->data + 5, 0);
650  avio_read(pb, pkt->data + 9, len);
651  return 0;
652  }
653  //now we have to deal with single slice
654 
655  *pseq = seq;
656  if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
657  vst->slices = ((hdr & 0x3F) << 1) + 1;
658  vst->videobufsize = len2 + 8*vst->slices + 1;
659  av_free_packet(&vst->pkt); //FIXME this should be output.
660  if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
661  return AVERROR(ENOMEM);
662  vst->videobufpos = 8*vst->slices + 1;
663  vst->cur_slice = 0;
664  vst->curpic_num = pic_num;
665  vst->pktpos = avio_tell(pb);
666  }
667  if(type == 2)
668  len = FFMIN(len, pos);
669 
670  if(++vst->cur_slice > vst->slices)
671  return 1;
672  AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
673  AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
674  if(vst->videobufpos + len > vst->videobufsize)
675  return 1;
676  if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
677  return AVERROR(EIO);
678  vst->videobufpos += len;
679  rm->remaining_len-= len;
680 
681  if (type == 2 || vst->videobufpos == vst->videobufsize) {
682  vst->pkt.data[0] = vst->cur_slice-1;
683  *pkt= vst->pkt;
684  vst->pkt.data= NULL;
685  vst->pkt.size= 0;
686  if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
687  memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
688  vst->videobufpos - 1 - 8*vst->slices);
689  pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
690  pkt->pts = AV_NOPTS_VALUE;
691  pkt->pos = vst->pktpos;
692  vst->slices = 0;
693  return 0;
694  }
695 
696  return 1;
697 }
698 
699 static inline void
701 {
702  uint8_t *ptr;
703  int j;
704 
705  if (st->codec->codec_id == AV_CODEC_ID_AC3) {
706  ptr = pkt->data;
707  for (j=0;j<pkt->size;j+=2) {
708  FFSWAP(int, ptr[0], ptr[1]);
709  ptr += 2;
710  }
711  }
712 }
713 
714 int
716  AVStream *st, RMStream *ast, int len, AVPacket *pkt,
717  int *seq, int flags, int64_t timestamp)
718 {
719  RMDemuxContext *rm = s->priv_data;
720 
721  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
722  rm->current_stream= st->id;
723  if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
724  return -1; //got partial frame
725  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
726  if ((ast->deint_id == DEINT_ID_GENR) ||
727  (ast->deint_id == DEINT_ID_INT4) ||
728  (ast->deint_id == DEINT_ID_SIPR)) {
729  int x;
730  int sps = ast->sub_packet_size;
731  int cfs = ast->coded_framesize;
732  int h = ast->sub_packet_h;
733  int y = ast->sub_packet_cnt;
734  int w = ast->audio_framesize;
735 
736  if (flags & 2)
737  y = ast->sub_packet_cnt = 0;
738  if (!y)
739  ast->audiotimestamp = timestamp;
740 
741  switch (ast->deint_id) {
742  case DEINT_ID_INT4:
743  for (x = 0; x < h/2; x++)
744  avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
745  break;
746  case DEINT_ID_GENR:
747  for (x = 0; x < w/sps; x++)
748  avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
749  break;
750  case DEINT_ID_SIPR:
751  avio_read(pb, ast->pkt.data + y * w, w);
752  break;
753  }
754 
755  if (++(ast->sub_packet_cnt) < h)
756  return -1;
757  if (ast->deint_id == DEINT_ID_SIPR)
758  ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
759 
760  ast->sub_packet_cnt = 0;
761  rm->audio_stream_num = st->index;
762  rm->audio_pkt_cnt = h * w / st->codec->block_align;
763  } else if ((ast->deint_id == DEINT_ID_VBRF) ||
764  (ast->deint_id == DEINT_ID_VBRS)) {
765  int x;
766  rm->audio_stream_num = st->index;
767  ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
768  if (ast->sub_packet_cnt) {
769  for (x = 0; x < ast->sub_packet_cnt; x++)
770  ast->sub_packet_lengths[x] = avio_rb16(pb);
771  rm->audio_pkt_cnt = ast->sub_packet_cnt;
772  ast->audiotimestamp = timestamp;
773  } else
774  return -1;
775  } else {
776  av_get_packet(pb, pkt, len);
777  rm_ac3_swap_bytes(st, pkt);
778  }
779  } else
780  av_get_packet(pb, pkt, len);
781 
782  pkt->stream_index = st->index;
783 
784 #if 0
785  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
786  if(st->codec->codec_id == AV_CODEC_ID_RV20){
787  int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
788  av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
789 
790  seq |= (timestamp&~0x3FFF);
791  if(seq - timestamp > 0x2000) seq -= 0x4000;
792  if(seq - timestamp < -0x2000) seq += 0x4000;
793  }
794  }
795 #endif
796 
797  pkt->pts = timestamp;
798  if (flags & 2)
799  pkt->flags |= AV_PKT_FLAG_KEY;
800 
801  return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
802 }
803 
804 int
806  AVStream *st, RMStream *ast, AVPacket *pkt)
807 {
808  RMDemuxContext *rm = s->priv_data;
809 
810  assert (rm->audio_pkt_cnt > 0);
811 
812  if (ast->deint_id == DEINT_ID_VBRF ||
813  ast->deint_id == DEINT_ID_VBRS)
815  else {
816  av_new_packet(pkt, st->codec->block_align);
817  memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
818  (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
819  st->codec->block_align);
820  }
821  rm->audio_pkt_cnt--;
822  if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
824  pkt->flags = AV_PKT_FLAG_KEY;
825  } else
826  pkt->flags = 0;
827  pkt->stream_index = st->index;
828 
829  return rm->audio_pkt_cnt;
830 }
831 
833 {
834  RMDemuxContext *rm = s->priv_data;
835  AVStream *st;
836  int i, len, res, seq = 1;
837  int64_t timestamp, pos;
838  int flags;
839 
840  for (;;) {
841  if (rm->audio_pkt_cnt) {
842  // If there are queued audio packet return them first
843  st = s->streams[rm->audio_stream_num];
844  ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
845  flags = 0;
846  } else {
847  if (rm->old_format) {
848  RMStream *ast;
849 
850  st = s->streams[0];
851  ast = st->priv_data;
852  timestamp = AV_NOPTS_VALUE;
853  len = !ast->audio_framesize ? RAW_PACKET_SIZE :
854  ast->coded_framesize * ast->sub_packet_h / 2;
855  flags = (seq++ == 1) ? 2 : 0;
856  pos = avio_tell(s->pb);
857  } else {
858  len=sync(s, &timestamp, &flags, &i, &pos);
859  if (len > 0)
860  st = s->streams[i];
861  }
862 
863  if(len<0 || s->pb->eof_reached)
864  return AVERROR(EIO);
865 
866  res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
867  &seq, flags, timestamp);
868  if((flags&2) && (seq&0x7F) == 1)
869  av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
870  if (res)
871  continue;
872  }
873 
874  if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
875  || st->discard >= AVDISCARD_ALL){
876  av_free_packet(pkt);
877  } else
878  break;
879  }
880 
881  return 0;
882 }
883 
885 {
886  int i;
887 
888  for (i=0;i<s->nb_streams;i++)
890 
891  return 0;
892 }
893 
894 static int rm_probe(AVProbeData *p)
895 {
896  /* check file header */
897  if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
898  p->buf[2] == 'M' && p->buf[3] == 'F' &&
899  p->buf[4] == 0 && p->buf[5] == 0) ||
900  (p->buf[0] == '.' && p->buf[1] == 'r' &&
901  p->buf[2] == 'a' && p->buf[3] == 0xfd))
902  return AVPROBE_SCORE_MAX;
903  else
904  return 0;
905 }
906 
907 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
908  int64_t *ppos, int64_t pos_limit)
909 {
910  RMDemuxContext *rm = s->priv_data;
911  int64_t pos, dts;
912  int stream_index2, flags, len, h;
913 
914  pos = *ppos;
915 
916  if(rm->old_format)
917  return AV_NOPTS_VALUE;
918 
919  avio_seek(s->pb, pos, SEEK_SET);
920  rm->remaining_len=0;
921  for(;;){
922  int seq=1;
923  AVStream *st;
924 
925  len=sync(s, &dts, &flags, &stream_index2, &pos);
926  if(len<0)
927  return AV_NOPTS_VALUE;
928 
929  st = s->streams[stream_index2];
930  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
931  h= avio_r8(s->pb); len--;
932  if(!(h & 0x40)){
933  seq = avio_r8(s->pb); len--;
934  }
935  }
936 
937  if((flags&2) && (seq&0x7F) == 1){
938  av_dlog(s, "%d %d-%d %"PRId64" %d\n",
939  flags, stream_index2, stream_index, dts, seq);
940  av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
941  if(stream_index2 == stream_index)
942  break;
943  }
944 
945  avio_skip(s->pb, len);
946  }
947  *ppos = pos;
948  return dts;
949 }
950 
952  .name = "rm",
953  .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
954  .priv_data_size = sizeof(RMDemuxContext),
955  .read_probe = rm_probe,
959  .read_timestamp = rm_read_dts,
960 };
961 
963  .name = "rdt",
964  .long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
965  .priv_data_size = sizeof(RMDemuxContext),
967  .flags = AVFMT_NOFILE,
968 };