rmdec.c
Go to the documentation of this file.
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"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/dict.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "riff.h"
28 #include "rm.h"
29 
30 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r')
31 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0')
32 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4')
33 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r')
34 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f')
35 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's')
36 
37 struct RMStream {
41  int curpic_num;
43  int64_t pktpos;
44 
45  int64_t audiotimestamp;
46  int sub_packet_cnt; // Subpacket counter, used while reading
50  int32_t deint_id;
51 };
52 
53 typedef struct {
61 
62 static const unsigned char sipr_swaps[38][2] = {
63  { 0, 63 }, { 1, 22 }, { 2, 44 }, { 3, 90 },
64  { 5, 81 }, { 7, 31 }, { 8, 86 }, { 9, 58 },
65  { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
66  { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
67  { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
68  { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
69  { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
70  { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
71  { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
72  { 67, 83 }, { 77, 80 }
73 };
74 
75 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
76 
77 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
78 {
79  int i;
80  char *q, r;
81 
82  q = buf;
83  for(i=0;i<len;i++) {
84  r = avio_r8(pb);
85  if (i < buf_size - 1)
86  *q++ = r;
87  }
88  if (buf_size > 0) *q = '\0';
89 }
90 
91 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
92 {
93  get_strl(pb, buf, buf_size, avio_r8(pb));
94 }
95 
96 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
97 {
98  if (size >= 1<<24)
99  return -1;
101  if (!avctx->extradata)
102  return AVERROR(ENOMEM);
103  avctx->extradata_size = avio_read(pb, avctx->extradata, size);
104  memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
105  if (avctx->extradata_size != size)
106  return AVERROR(EIO);
107  return 0;
108 }
109 
110 static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)
111 {
112  char buf[1024];
113  int i;
114  for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
115  int len = wide ? avio_rb16(pb) : avio_r8(pb);
116  get_strl(pb, buf, sizeof(buf), len);
117  av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
118  }
119 }
120 
122 {
123  RMStream *rms = av_mallocz(sizeof(RMStream));
124  rms->curpic_num = -1;
125  return rms;
126 }
127 
129 {
130  av_free_packet(&rms->pkt);
131 }
132 
134  AVStream *st, RMStream *ast, int read_all)
135 {
136  char buf[256];
137  uint32_t version;
138  int ret;
139 
140  /* ra type header */
141  version = avio_rb16(pb); /* version */
142  if (version == 3) {
143  int header_size = avio_rb16(pb);
144  int64_t startpos = avio_tell(pb);
145  avio_skip(pb, 14);
146  rm_read_metadata(s, pb, 0);
147  if ((startpos + header_size) >= avio_tell(pb) + 2) {
148  // fourcc (should always be "lpcJ")
149  avio_r8(pb);
150  get_str8(pb, buf, sizeof(buf));
151  }
152  // Skip extra header crap (this should never happen)
153  if ((startpos + header_size) > avio_tell(pb))
154  avio_skip(pb, header_size + startpos - avio_tell(pb));
155  st->codec->sample_rate = 8000;
156  st->codec->channels = 1;
159  ast->deint_id = DEINT_ID_INT0;
160  } else {
161  int flavor, sub_packet_h, coded_framesize, sub_packet_size;
162  int codecdata_length;
163  /* old version (4) */
164  avio_skip(pb, 2); /* unused */
165  avio_rb32(pb); /* .ra4 */
166  avio_rb32(pb); /* data size */
167  avio_rb16(pb); /* version2 */
168  avio_rb32(pb); /* header size */
169  flavor= avio_rb16(pb); /* add codec info / flavor */
170  ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
171  avio_rb32(pb); /* ??? */
172  avio_rb32(pb); /* ??? */
173  avio_rb32(pb); /* ??? */
174  ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
175  st->codec->block_align= avio_rb16(pb); /* frame size */
176  ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
177  avio_rb16(pb); /* ??? */
178  if (version == 5) {
179  avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
180  }
181  st->codec->sample_rate = avio_rb16(pb);
182  avio_rb32(pb);
183  st->codec->channels = avio_rb16(pb);
184  if (version == 5) {
185  ast->deint_id = avio_rl32(pb);
186  avio_read(pb, buf, 4);
187  buf[4] = 0;
188  } else {
189  get_str8(pb, buf, sizeof(buf)); /* desc */
190  ast->deint_id = AV_RL32(buf);
191  get_str8(pb, buf, sizeof(buf)); /* desc */
192  }
194  st->codec->codec_tag = AV_RL32(buf);
196  st->codec->codec_tag);
197 
198  switch (st->codec->codec_id) {
199  case CODEC_ID_AC3:
201  break;
202  case CODEC_ID_RA_288:
203  st->codec->extradata_size= 0;
204  ast->audio_framesize = st->codec->block_align;
205  st->codec->block_align = coded_framesize;
206  break;
207  case CODEC_ID_COOK:
208  case CODEC_ID_ATRAC3:
209  case CODEC_ID_SIPR:
210  avio_rb16(pb); avio_r8(pb);
211  if (version == 5)
212  avio_r8(pb);
213  codecdata_length = avio_rb32(pb);
214  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
215  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
216  return -1;
217  }
218 
219  ast->audio_framesize = st->codec->block_align;
220  if (st->codec->codec_id == CODEC_ID_SIPR) {
221  if (flavor > 3) {
222  av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
223  flavor);
224  return -1;
225  }
226  st->codec->block_align = ff_sipr_subpk_size[flavor];
227  } else {
228  if(sub_packet_size <= 0){
229  av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
230  return -1;
231  }
232  st->codec->block_align = ast->sub_packet_size;
233  }
234  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
235  return ret;
236  break;
237  case CODEC_ID_AAC:
238  avio_rb16(pb); avio_r8(pb);
239  if (version == 5)
240  avio_r8(pb);
241  codecdata_length = avio_rb32(pb);
242  if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
243  av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
244  return -1;
245  }
246  if (codecdata_length >= 1) {
247  avio_r8(pb);
248  if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
249  return ret;
250  }
251  break;
252  default:
253  av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
254  }
255  if (ast->deint_id == DEINT_ID_INT4 ||
256  ast->deint_id == DEINT_ID_GENR ||
257  ast->deint_id == DEINT_ID_SIPR) {
258  if (st->codec->block_align <= 0 ||
259  ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
260  ast->audio_framesize * sub_packet_h < st->codec->block_align)
261  return AVERROR_INVALIDDATA;
262  if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
263  return AVERROR(ENOMEM);
264  }
265  switch (ast->deint_id) {
266  case DEINT_ID_INT4:
267  if (ast->coded_framesize > ast->audio_framesize ||
268  sub_packet_h <= 1 ||
269  ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
270  return AVERROR_INVALIDDATA;
271  break;
272  case DEINT_ID_GENR:
273  if (ast->sub_packet_size <= 0 ||
274  ast->sub_packet_size > ast->audio_framesize)
275  return AVERROR_INVALIDDATA;
276  break;
277  case DEINT_ID_SIPR:
278  case DEINT_ID_INT0:
279  case DEINT_ID_VBRS:
280  case DEINT_ID_VBRF:
281  break;
282  default:
283  av_log(NULL,0,"Unknown interleaver %X\n", ast->deint_id);
284  return AVERROR_INVALIDDATA;
285  }
286 
287  if (read_all) {
288  avio_r8(pb);
289  avio_r8(pb);
290  avio_r8(pb);
291  rm_read_metadata(s, pb, 0);
292  }
293  }
294  return 0;
295 }
296 
297 int
299  AVStream *st, RMStream *rst, int codec_data_size)
300 {
301  unsigned int v;
302  int size;
303  int64_t codec_pos;
304  int ret;
305 
306  avpriv_set_pts_info(st, 64, 1, 1000);
307  codec_pos = avio_tell(pb);
308  v = avio_rb32(pb);
309  if (v == MKTAG(0xfd, 'a', 'r', '.')) {
310  /* ra type header */
311  if (rm_read_audio_stream_info(s, pb, st, rst, 0))
312  return -1;
313  } else {
314  int fps;
315  if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
316  fail1:
317  av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
318  goto skip;
319  }
320  st->codec->codec_tag = avio_rl32(pb);
322  st->codec->codec_tag);
323 // av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
324  if (st->codec->codec_id == CODEC_ID_NONE)
325  goto fail1;
326  st->codec->width = avio_rb16(pb);
327  st->codec->height = avio_rb16(pb);
328  avio_skip(pb, 2); // looks like bits per sample
329  avio_skip(pb, 4); // always zero?
332  fps = avio_rb32(pb);
333 
334  if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
335  return ret;
336 
337  if (fps > 0) {
339  0x10000, fps, (1 << 30) - 1);
340  } else if (s->error_recognition & AV_EF_EXPLODE) {
341  av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
342  return AVERROR_INVALIDDATA;
343  }
344  st->avg_frame_rate = st->r_frame_rate;
345  }
346 
347 skip:
348  /* skip codec info */
349  size = avio_tell(pb) - codec_pos;
350  avio_skip(pb, codec_data_size - size);
351 
352  return 0;
353 }
354 
358 {
359  AVIOContext *pb = s->pb;
360  unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
361  AVStream *st;
362 
363  do {
364  if (avio_rl32(pb) != MKTAG('I','N','D','X'))
365  return -1;
366  size = avio_rb32(pb);
367  if (size < 20)
368  return -1;
369  avio_skip(pb, 2);
370  n_pkts = avio_rb32(pb);
371  str_id = avio_rb16(pb);
372  next_off = avio_rb32(pb);
373  for (n = 0; n < s->nb_streams; n++)
374  if (s->streams[n]->id == str_id) {
375  st = s->streams[n];
376  break;
377  }
378  if (n == s->nb_streams) {
379  av_log(s, AV_LOG_ERROR,
380  "Invalid stream index %d for index at pos %"PRId64"\n",
381  str_id, avio_tell(pb));
382  goto skip;
383  } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
384  av_log(s, AV_LOG_ERROR,
385  "Nr. of packets in packet index for stream index %d "
386  "exceeds filesize (%"PRId64" at %"PRId64" = %d)\n",
387  str_id, avio_size(pb), avio_tell(pb),
388  (avio_size(pb) - avio_tell(pb)) / 14);
389  goto skip;
390  }
391 
392  for (n = 0; n < n_pkts; n++) {
393  avio_skip(pb, 2);
394  pts = avio_rb32(pb);
395  pos = avio_rb32(pb);
396  avio_skip(pb, 4); /* packet no. */
397 
398  av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
399  }
400 
401 skip:
402  if (next_off && avio_tell(pb) < next_off &&
403  avio_seek(pb, next_off, SEEK_SET) < 0) {
404  av_log(s, AV_LOG_ERROR,
405  "Non-linear index detected, not supported\n");
406  return -1;
407  }
408  } while (next_off);
409 
410  return 0;
411 }
412 
414 {
415  RMDemuxContext *rm = s->priv_data;
416  AVStream *st;
417 
418  rm->old_format = 1;
419  st = avformat_new_stream(s, NULL);
420  if (!st)
421  return -1;
423  return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
424 }
425 
427 {
428  RMDemuxContext *rm = s->priv_data;
429  AVStream *st;
430  AVIOContext *pb = s->pb;
431  unsigned int tag;
432  int tag_size;
433  unsigned int start_time, duration;
434  unsigned int data_off = 0, indx_off = 0;
435  char buf[128];
436  int flags = 0;
437 
438  tag = avio_rl32(pb);
439  if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
440  /* very old .ra format */
441  return rm_read_header_old(s);
442  } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
443  return AVERROR(EIO);
444  }
445 
446  avio_rb32(pb); /* header size */
447  avio_rb16(pb);
448  avio_rb32(pb);
449  avio_rb32(pb); /* number of headers */
450 
451  for(;;) {
452  if (pb->eof_reached)
453  return -1;
454  tag = avio_rl32(pb);
455  tag_size = avio_rb32(pb);
456  avio_rb16(pb);
457  av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
458  (tag ) & 0xff,
459  (tag >> 8) & 0xff,
460  (tag >> 16) & 0xff,
461  (tag >> 24) & 0xff,
462  tag,
463  tag_size);
464  if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
465  return -1;
466  switch(tag) {
467  case MKTAG('P', 'R', 'O', 'P'):
468  /* file header */
469  avio_rb32(pb); /* max bit rate */
470  avio_rb32(pb); /* avg bit rate */
471  avio_rb32(pb); /* max packet size */
472  avio_rb32(pb); /* avg packet size */
473  avio_rb32(pb); /* nb packets */
474  avio_rb32(pb); /* duration */
475  avio_rb32(pb); /* preroll */
476  indx_off = avio_rb32(pb); /* index offset */
477  data_off = avio_rb32(pb); /* data offset */
478  avio_rb16(pb); /* nb streams */
479  flags = avio_rb16(pb); /* flags */
480  break;
481  case MKTAG('C', 'O', 'N', 'T'):
482  rm_read_metadata(s, pb, 1);
483  break;
484  case MKTAG('M', 'D', 'P', 'R'):
485  st = avformat_new_stream(s, NULL);
486  if (!st)
487  return AVERROR(ENOMEM);
488  st->id = avio_rb16(pb);
489  avio_rb32(pb); /* max bit rate */
490  st->codec->bit_rate = avio_rb32(pb); /* bit rate */
491  avio_rb32(pb); /* max packet size */
492  avio_rb32(pb); /* avg packet size */
493  start_time = avio_rb32(pb); /* start time */
494  avio_rb32(pb); /* preroll */
495  duration = avio_rb32(pb); /* duration */
496  st->start_time = start_time;
497  st->duration = duration;
498  get_str8(pb, buf, sizeof(buf)); /* desc */
499  get_str8(pb, buf, sizeof(buf)); /* mimetype */
502  if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
503  avio_rb32(pb)) < 0)
504  return -1;
505  break;
506  case MKTAG('D', 'A', 'T', 'A'):
507  goto header_end;
508  default:
509  /* unknown tag: skip it */
510  avio_skip(pb, tag_size - 10);
511  break;
512  }
513  }
514  header_end:
515  rm->nb_packets = avio_rb32(pb); /* number of packets */
516  if (!rm->nb_packets && (flags & 4))
517  rm->nb_packets = 3600 * 25;
518  avio_rb32(pb); /* next data header */
519 
520  if (!data_off)
521  data_off = avio_tell(pb) - 18;
522  if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
523  avio_seek(pb, indx_off, SEEK_SET) >= 0) {
524  rm_read_index(s);
525  avio_seek(pb, data_off + 18, SEEK_SET);
526  }
527 
528  return 0;
529 }
530 
531 static int get_num(AVIOContext *pb, int *len)
532 {
533  int n, n1;
534 
535  n = avio_rb16(pb);
536  (*len)-=2;
537  n &= 0x7FFF;
538  if (n >= 0x4000) {
539  return n - 0x4000;
540  } else {
541  n1 = avio_rb16(pb);
542  (*len)-=2;
543  return (n << 16) | n1;
544  }
545 }
546 
547 /* multiple of 20 bytes for ra144 (ugly) */
548 #define RAW_PACKET_SIZE 1000
549 
550 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
551  RMDemuxContext *rm = s->priv_data;
552  AVIOContext *pb = s->pb;
553  AVStream *st;
554  uint32_t state=0xFFFFFFFF;
555 
556  while(!pb->eof_reached){
557  int len, num, i;
558  *pos= avio_tell(pb) - 3;
559  if(rm->remaining_len > 0){
560  num= rm->current_stream;
561  len= rm->remaining_len;
562  *timestamp = AV_NOPTS_VALUE;
563  *flags= 0;
564  }else{
565  state= (state<<8) + avio_r8(pb);
566 
567  if(state == MKBETAG('I', 'N', 'D', 'X')){
568  int n_pkts, expected_len;
569  len = avio_rb32(pb);
570  avio_skip(pb, 2);
571  n_pkts = avio_rb32(pb);
572  expected_len = 20 + n_pkts * 14;
573  if (len == 20)
574  /* some files don't add index entries to chunk size... */
575  len = expected_len;
576  else if (len != expected_len)
578  "Index size %d (%d pkts) is wrong, should be %d.\n",
579  len, n_pkts, expected_len);
580  len -= 14; // we already read part of the index header
581  if(len<0)
582  continue;
583  goto skip;
584  } else if (state == MKBETAG('D','A','T','A')) {
586  "DATA tag in middle of chunk, file may be broken.\n");
587  }
588 
589  if(state > (unsigned)0xFFFF || state <= 12)
590  continue;
591  len=state - 12;
592  state= 0xFFFFFFFF;
593 
594  num = avio_rb16(pb);
595  *timestamp = avio_rb32(pb);
596  avio_r8(pb); /* reserved */
597  *flags = avio_r8(pb); /* flags */
598  }
599  for(i=0;i<s->nb_streams;i++) {
600  st = s->streams[i];
601  if (num == st->id)
602  break;
603  }
604  if (i == s->nb_streams) {
605 skip:
606  /* skip packet if unknown number */
607  avio_skip(pb, len);
608  rm->remaining_len = 0;
609  continue;
610  }
611  *stream_index= i;
612 
613  return len;
614  }
615  return -1;
616 }
617 
619  RMDemuxContext *rm, RMStream *vst,
620  AVPacket *pkt, int len, int *pseq,
621  int64_t *timestamp)
622 {
623  int hdr, seq, pic_num, len2, pos;
624  int type;
625 
626  hdr = avio_r8(pb); len--;
627  type = hdr >> 6;
628 
629  if(type != 3){ // not frame as a part of packet
630  seq = avio_r8(pb); len--;
631  }
632  if(type != 1){ // not whole frame
633  len2 = get_num(pb, &len);
634  pos = get_num(pb, &len);
635  pic_num = avio_r8(pb); len--;
636  }
637  if(len<0)
638  return -1;
639  rm->remaining_len = len;
640  if(type&1){ // frame, not slice
641  if(type == 3){ // frame as a part of packet
642  len= len2;
643  *timestamp = pos;
644  }
645  if(rm->remaining_len < len)
646  return -1;
647  rm->remaining_len -= len;
648  if(av_new_packet(pkt, len + 9) < 0)
649  return AVERROR(EIO);
650  pkt->data[0] = 0;
651  AV_WL32(pkt->data + 1, 1);
652  AV_WL32(pkt->data + 5, 0);
653  avio_read(pb, pkt->data + 9, len);
654  return 0;
655  }
656  //now we have to deal with single slice
657 
658  *pseq = seq;
659  if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
660  vst->slices = ((hdr & 0x3F) << 1) + 1;
661  vst->videobufsize = len2 + 8*vst->slices + 1;
662  av_free_packet(&vst->pkt); //FIXME this should be output.
663  if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
664  return AVERROR(ENOMEM);
665  vst->videobufpos = 8*vst->slices + 1;
666  vst->cur_slice = 0;
667  vst->curpic_num = pic_num;
668  vst->pktpos = avio_tell(pb);
669  }
670  if(type == 2)
671  len = FFMIN(len, pos);
672 
673  if(++vst->cur_slice > vst->slices)
674  return 1;
675  AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
676  AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
677  if(vst->videobufpos + len > vst->videobufsize)
678  return 1;
679  if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
680  return AVERROR(EIO);
681  vst->videobufpos += len;
682  rm->remaining_len-= len;
683 
684  if (type == 2 || vst->videobufpos == vst->videobufsize) {
685  vst->pkt.data[0] = vst->cur_slice-1;
686  *pkt= vst->pkt;
687  vst->pkt.data= NULL;
688  vst->pkt.size= 0;
689  if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
690  memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
691  vst->videobufpos - 1 - 8*vst->slices);
692  pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
693  pkt->pts = AV_NOPTS_VALUE;
694  pkt->pos = vst->pktpos;
695  vst->slices = 0;
696  return 0;
697  }
698 
699  return 1;
700 }
701 
702 static inline void
704 {
705  uint8_t *ptr;
706  int j;
707 
708  if (st->codec->codec_id == CODEC_ID_AC3) {
709  ptr = pkt->data;
710  for (j=0;j<pkt->size;j+=2) {
711  FFSWAP(int, ptr[0], ptr[1]);
712  ptr += 2;
713  }
714  }
715 }
716 
721 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
722 {
723  int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
724 
725  for (n = 0; n < 38; n++) {
726  int j;
727  int i = bs * sipr_swaps[n][0];
728  int o = bs * sipr_swaps[n][1];
729 
730  /* swap 4bit-nibbles of block 'i' with 'o' */
731  for (j = 0; j < bs; j++, i++, o++) {
732  int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
733  y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
734 
735  buf[o >> 1] = (x << (4 * (o & 1))) |
736  (buf[o >> 1] & (0xF << (4 * !(o & 1))));
737  buf[i >> 1] = (y << (4 * (i & 1))) |
738  (buf[i >> 1] & (0xF << (4 * !(i & 1))));
739  }
740  }
741 }
742 
743 int
745  AVStream *st, RMStream *ast, int len, AVPacket *pkt,
746  int *seq, int flags, int64_t timestamp)
747 {
748  RMDemuxContext *rm = s->priv_data;
749 
750  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
751  rm->current_stream= st->id;
752  if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp))
753  return -1; //got partial frame
754  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
755  if ((ast->deint_id == DEINT_ID_GENR) ||
756  (ast->deint_id == DEINT_ID_INT4) ||
757  (ast->deint_id == DEINT_ID_SIPR)) {
758  int x;
759  int sps = ast->sub_packet_size;
760  int cfs = ast->coded_framesize;
761  int h = ast->sub_packet_h;
762  int y = ast->sub_packet_cnt;
763  int w = ast->audio_framesize;
764 
765  if (flags & 2)
766  y = ast->sub_packet_cnt = 0;
767  if (!y)
768  ast->audiotimestamp = timestamp;
769 
770  switch (ast->deint_id) {
771  case DEINT_ID_INT4:
772  for (x = 0; x < h/2; x++)
773  avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
774  break;
775  case DEINT_ID_GENR:
776  for (x = 0; x < w/sps; x++)
777  avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
778  break;
779  case DEINT_ID_SIPR:
780  avio_read(pb, ast->pkt.data + y * w, w);
781  break;
782  }
783 
784  if (++(ast->sub_packet_cnt) < h)
785  return -1;
786  if (ast->deint_id == DEINT_ID_SIPR)
787  ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
788 
789  ast->sub_packet_cnt = 0;
790  rm->audio_stream_num = st->index;
791  rm->audio_pkt_cnt = h * w / st->codec->block_align;
792  } else if ((ast->deint_id == DEINT_ID_VBRF) ||
793  (ast->deint_id == DEINT_ID_VBRS)) {
794  int x;
795  rm->audio_stream_num = st->index;
796  ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
797  if (ast->sub_packet_cnt) {
798  for (x = 0; x < ast->sub_packet_cnt; x++)
799  ast->sub_packet_lengths[x] = avio_rb16(pb);
800  rm->audio_pkt_cnt = ast->sub_packet_cnt;
801  ast->audiotimestamp = timestamp;
802  } else
803  return -1;
804  } else {
805  av_get_packet(pb, pkt, len);
806  rm_ac3_swap_bytes(st, pkt);
807  }
808  } else
809  av_get_packet(pb, pkt, len);
810 
811  pkt->stream_index = st->index;
812 
813 #if 0
814  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
815  if(st->codec->codec_id == CODEC_ID_RV20){
816  int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
817  av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
818 
819  seq |= (timestamp&~0x3FFF);
820  if(seq - timestamp > 0x2000) seq -= 0x4000;
821  if(seq - timestamp < -0x2000) seq += 0x4000;
822  }
823  }
824 #endif
825 
826  pkt->pts = timestamp;
827  if (flags & 2)
828  pkt->flags |= AV_PKT_FLAG_KEY;
829 
830  return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
831 }
832 
833 int
835  AVStream *st, RMStream *ast, AVPacket *pkt)
836 {
837  RMDemuxContext *rm = s->priv_data;
838 
839  assert (rm->audio_pkt_cnt > 0);
840 
841  if (ast->deint_id == DEINT_ID_VBRF ||
842  ast->deint_id == DEINT_ID_VBRS)
844  else {
845  av_new_packet(pkt, st->codec->block_align);
846  memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
847  (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
848  st->codec->block_align);
849  }
850  rm->audio_pkt_cnt--;
851  if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
853  pkt->flags = AV_PKT_FLAG_KEY;
854  } else
855  pkt->flags = 0;
856  pkt->stream_index = st->index;
857 
858  return rm->audio_pkt_cnt;
859 }
860 
862 {
863  RMDemuxContext *rm = s->priv_data;
864  AVStream *st;
865  int i, len, res, seq = 1;
866  int64_t timestamp, pos;
867  int flags;
868 
869  for (;;) {
870  if (rm->audio_pkt_cnt) {
871  // If there are queued audio packet return them first
872  st = s->streams[rm->audio_stream_num];
873  ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
874  flags = 0;
875  } else {
876  if (rm->old_format) {
877  RMStream *ast;
878 
879  st = s->streams[0];
880  ast = st->priv_data;
881  timestamp = AV_NOPTS_VALUE;
882  len = !ast->audio_framesize ? RAW_PACKET_SIZE :
883  ast->coded_framesize * ast->sub_packet_h / 2;
884  flags = (seq++ == 1) ? 2 : 0;
885  pos = avio_tell(s->pb);
886  } else {
887  len=sync(s, &timestamp, &flags, &i, &pos);
888  if (len > 0)
889  st = s->streams[i];
890  }
891 
892  if(len<0 || s->pb->eof_reached)
893  return AVERROR(EIO);
894 
895  res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
896  &seq, flags, timestamp);
897  if((flags&2) && (seq&0x7F) == 1)
898  av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
899  if (res)
900  continue;
901  }
902 
903  if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
904  || st->discard >= AVDISCARD_ALL){
905  av_free_packet(pkt);
906  } else
907  break;
908  }
909 
910  return 0;
911 }
912 
914 {
915  int i;
916 
917  for (i=0;i<s->nb_streams;i++)
919 
920  return 0;
921 }
922 
923 static int rm_probe(AVProbeData *p)
924 {
925  /* check file header */
926  if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
927  p->buf[2] == 'M' && p->buf[3] == 'F' &&
928  p->buf[4] == 0 && p->buf[5] == 0) ||
929  (p->buf[0] == '.' && p->buf[1] == 'r' &&
930  p->buf[2] == 'a' && p->buf[3] == 0xfd))
931  return AVPROBE_SCORE_MAX;
932  else
933  return 0;
934 }
935 
936 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
937  int64_t *ppos, int64_t pos_limit)
938 {
939  RMDemuxContext *rm = s->priv_data;
940  int64_t pos, dts;
941  int stream_index2, flags, len, h;
942 
943  pos = *ppos;
944 
945  if(rm->old_format)
946  return AV_NOPTS_VALUE;
947 
948  avio_seek(s->pb, pos, SEEK_SET);
949  rm->remaining_len=0;
950  for(;;){
951  int seq=1;
952  AVStream *st;
953 
954  len=sync(s, &dts, &flags, &stream_index2, &pos);
955  if(len<0)
956  return AV_NOPTS_VALUE;
957 
958  st = s->streams[stream_index2];
959  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
960  h= avio_r8(s->pb); len--;
961  if(!(h & 0x40)){
962  seq = avio_r8(s->pb); len--;
963  }
964  }
965 
966  if((flags&2) && (seq&0x7F) == 1){
967 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
968  av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
969  if(stream_index2 == stream_index)
970  break;
971  }
972 
973  avio_skip(s->pb, len);
974  }
975  *ppos = pos;
976  return dts;
977 }
978 
980  .name = "rm",
981  .long_name = NULL_IF_CONFIG_SMALL("RealMedia format"),
982  .priv_data_size = sizeof(RMDemuxContext),
983  .read_probe = rm_probe,
987  .read_timestamp = rm_read_dts,
988 };
989 
991  .name = "rdt",
992  .long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
993  .priv_data_size = sizeof(RMDemuxContext),
995  .flags = AVFMT_NOFILE,
996 };