asfdec.c
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1 /*
2  * ASF 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 //#define DEBUG
23 
24 #include "libavutil/bswap.h"
25 #include "libavutil/common.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavcodec/mpegaudio.h"
30 #include "avformat.h"
31 #include "internal.h"
32 #include "avio_internal.h"
33 #include "riff.h"
34 #include "asf.h"
35 #include "asfcrypt.h"
36 #include "avlanguage.h"
37 
38 typedef struct {
39  int asfid2avid[128];
40  ASFStream streams[128];
41  uint32_t stream_bitrates[128];
42  AVRational dar[128];
43  char stream_languages[128][6];
44  /* non streamed additonnal info */
45  /* packet filling */
47  /* only for reading */
48  uint64_t data_offset;
49  uint64_t data_object_offset;
50  uint64_t data_object_size;
52 
54 
64  unsigned int packet_frag_offset;
65  unsigned int packet_frag_size;
71  int64_t packet_pos;
72 
74 
76 } ASFContext;
77 
78 #undef NDEBUG
79 #include <assert.h>
80 
81 #define ASF_MAX_STREAMS 127
82 #define FRAME_HEADER_SIZE 17
83 // Fix Me! FRAME_HEADER_SIZE may be different.
84 
85 static const ff_asf_guid index_guid = {
86  0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
87 };
88 
89 #ifdef DEBUG
90 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
91  0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
92 };
93 
94 #define PRINT_IF_GUID(g,cmp) \
95 if (!ff_guidcmp(g, &cmp)) \
96  av_dlog(NULL, "(GUID: %s) ", #cmp)
97 
98 static void print_guid(const ff_asf_guid *g)
99 {
100  int i;
101  PRINT_IF_GUID(g, ff_asf_header);
102  else PRINT_IF_GUID(g, ff_asf_file_header);
103  else PRINT_IF_GUID(g, ff_asf_stream_header);
104  else PRINT_IF_GUID(g, ff_asf_audio_stream);
105  else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
106  else PRINT_IF_GUID(g, ff_asf_video_stream);
107  else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
108  else PRINT_IF_GUID(g, ff_asf_command_stream);
109  else PRINT_IF_GUID(g, ff_asf_comment_header);
110  else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
111  else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
112  else PRINT_IF_GUID(g, ff_asf_data_header);
113  else PRINT_IF_GUID(g, index_guid);
114  else PRINT_IF_GUID(g, ff_asf_head1_guid);
115  else PRINT_IF_GUID(g, ff_asf_head2_guid);
116  else PRINT_IF_GUID(g, ff_asf_my_guid);
117  else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
118  else PRINT_IF_GUID(g, ff_asf_extended_content_header);
119  else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
120  else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
121  else PRINT_IF_GUID(g, ff_asf_metadata_header);
122  else PRINT_IF_GUID(g, ff_asf_marker_header);
123  else PRINT_IF_GUID(g, stream_bitrate_guid);
124  else PRINT_IF_GUID(g, ff_asf_language_guid);
125  else
126  av_dlog(NULL, "(GUID: unknown) ");
127  for(i=0;i<16;i++)
128  av_dlog(NULL, " 0x%02x,", (*g)[i]);
129  av_dlog(NULL, "}\n");
130 }
131 #undef PRINT_IF_GUID
132 #else
133 #define print_guid(g)
134 #endif
135 
137 {
138  assert(sizeof(*g) == 16);
139  avio_read(s, *g, sizeof(*g));
140 }
141 
142 static int asf_probe(AVProbeData *pd)
143 {
144  /* check file header */
145  if (!ff_guidcmp(pd->buf, &ff_asf_header))
146  return AVPROBE_SCORE_MAX;
147  else
148  return 0;
149 }
150 
151 static int get_value(AVIOContext *pb, int type){
152  switch(type){
153  case 2: return avio_rl32(pb);
154  case 3: return avio_rl32(pb);
155  case 4: return avio_rl64(pb);
156  case 5: return avio_rl16(pb);
157  default:return INT_MIN;
158  }
159 }
160 
161 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
162 {
163  char *value;
164  int64_t off = avio_tell(s->pb);
165 
166  if ((unsigned)len >= (UINT_MAX - 1)/2)
167  return;
168 
169  value = av_malloc(2*len+1);
170  if (!value)
171  goto finish;
172 
173  if (type == 0) { // UTF16-LE
174  avio_get_str16le(s->pb, len, value, 2*len + 1);
175  } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
176  uint64_t num = get_value(s->pb, type);
177  snprintf(value, len, "%"PRIu64, num);
178  } else {
179  av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
180  goto finish;
181  }
182  if (*value)
183  av_dict_set(&s->metadata, key, value, 0);
184 finish:
185  av_freep(&value);
186  avio_seek(s->pb, off + len, SEEK_SET);
187 }
188 
190 {
191  ASFContext *asf = s->priv_data;
192  AVIOContext *pb = s->pb;
193 
194  ff_get_guid(pb, &asf->hdr.guid);
195  asf->hdr.file_size = avio_rl64(pb);
196  asf->hdr.create_time = avio_rl64(pb);
197  avio_rl64(pb); /* number of packets */
198  asf->hdr.play_time = avio_rl64(pb);
199  asf->hdr.send_time = avio_rl64(pb);
200  asf->hdr.preroll = avio_rl32(pb);
201  asf->hdr.ignore = avio_rl32(pb);
202  asf->hdr.flags = avio_rl32(pb);
203  asf->hdr.min_pktsize = avio_rl32(pb);
204  asf->hdr.max_pktsize = avio_rl32(pb);
205  if (asf->hdr.min_pktsize >= (1U<<29))
206  return AVERROR_INVALIDDATA;
207  asf->hdr.max_bitrate = avio_rl32(pb);
208  s->packet_size = asf->hdr.max_pktsize;
209 
210  return 0;
211 }
212 
214 {
215  ASFContext *asf = s->priv_data;
216  AVIOContext *pb = s->pb;
217  AVStream *st;
218  ASFStream *asf_st;
219  ff_asf_guid g;
220  enum AVMediaType type;
221  int type_specific_size, sizeX;
222  unsigned int tag1;
223  int64_t pos1, pos2, start_time;
224  int test_for_ext_stream_audio, is_dvr_ms_audio=0;
225 
226  if (s->nb_streams == ASF_MAX_STREAMS) {
227  av_log(s, AV_LOG_ERROR, "too many streams\n");
228  return AVERROR(EINVAL);
229  }
230 
231  pos1 = avio_tell(pb);
232 
233  st = avformat_new_stream(s, NULL);
234  if (!st)
235  return AVERROR(ENOMEM);
236  avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
237  asf_st = av_mallocz(sizeof(ASFStream));
238  if (!asf_st)
239  return AVERROR(ENOMEM);
240  st->priv_data = asf_st;
241  st->start_time = 0;
242  start_time = asf->hdr.preroll;
243 
244  asf_st->stream_language_index = 128; // invalid stream index means no language info
245 
246  if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
247  st->duration = asf->hdr.play_time /
248  (10000000 / 1000) - start_time;
249  }
250  ff_get_guid(pb, &g);
251 
252  test_for_ext_stream_audio = 0;
253  if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
254  type = AVMEDIA_TYPE_AUDIO;
255  } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
256  type = AVMEDIA_TYPE_VIDEO;
257  } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
258  type = AVMEDIA_TYPE_VIDEO;
260  } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
261  type = AVMEDIA_TYPE_DATA;
263  test_for_ext_stream_audio = 1;
264  type = AVMEDIA_TYPE_UNKNOWN;
265  } else {
266  return -1;
267  }
268  ff_get_guid(pb, &g);
269  avio_skip(pb, 8); /* total_size */
270  type_specific_size = avio_rl32(pb);
271  avio_rl32(pb);
272  st->id = avio_rl16(pb) & 0x7f; /* stream id */
273  // mapping of asf ID to AV stream ID;
274  asf->asfid2avid[st->id] = s->nb_streams - 1;
275 
276  avio_rl32(pb);
277 
278  if (test_for_ext_stream_audio) {
279  ff_get_guid(pb, &g);
281  type = AVMEDIA_TYPE_AUDIO;
282  is_dvr_ms_audio=1;
283  ff_get_guid(pb, &g);
284  avio_rl32(pb);
285  avio_rl32(pb);
286  avio_rl32(pb);
287  ff_get_guid(pb, &g);
288  avio_rl32(pb);
289  }
290  }
291 
292  st->codec->codec_type = type;
293  if (type == AVMEDIA_TYPE_AUDIO) {
294  int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
295  if (ret < 0)
296  return ret;
297  if (is_dvr_ms_audio) {
298  // codec_id and codec_tag are unreliable in dvr_ms
299  // files. Set them later by probing stream.
301  st->codec->codec_tag = 0;
302  }
303  if (st->codec->codec_id == CODEC_ID_AAC) {
305  } else {
307  }
308  /* We have to init the frame size at some point .... */
309  pos2 = avio_tell(pb);
310  if (size >= (pos2 + 8 - pos1 + 24)) {
311  asf_st->ds_span = avio_r8(pb);
312  asf_st->ds_packet_size = avio_rl16(pb);
313  asf_st->ds_chunk_size = avio_rl16(pb);
314  avio_rl16(pb); //ds_data_size
315  avio_r8(pb); //ds_silence_data
316  }
317  //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
318  // asf_st->ds_packet_size, asf_st->ds_chunk_size,
319  // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
320  if (asf_st->ds_span > 1) {
321  if (!asf_st->ds_chunk_size
322  || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
323  || asf_st->ds_packet_size % asf_st->ds_chunk_size)
324  asf_st->ds_span = 0; // disable descrambling
325  }
326  switch (st->codec->codec_id) {
327  case CODEC_ID_MP3:
329  break;
330  case CODEC_ID_PCM_S16LE:
331  case CODEC_ID_PCM_S16BE:
332  case CODEC_ID_PCM_U16LE:
333  case CODEC_ID_PCM_U16BE:
334  case CODEC_ID_PCM_S8:
335  case CODEC_ID_PCM_U8:
336  case CODEC_ID_PCM_ALAW:
337  case CODEC_ID_PCM_MULAW:
338  st->codec->frame_size = 1;
339  break;
340  default:
341  /* This is probably wrong, but it prevents a crash later */
342  st->codec->frame_size = 1;
343  break;
344  }
345  } else if (type == AVMEDIA_TYPE_VIDEO &&
346  size - (avio_tell(pb) - pos1 + 24) >= 51) {
347  avio_rl32(pb);
348  avio_rl32(pb);
349  avio_r8(pb);
350  avio_rl16(pb); /* size */
351  sizeX= avio_rl32(pb); /* size */
352  st->codec->width = avio_rl32(pb);
353  st->codec->height = avio_rl32(pb);
354  /* not available for asf */
355  avio_rl16(pb); /* panes */
356  st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
357  tag1 = avio_rl32(pb);
358  avio_skip(pb, 20);
359  // av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
360  if (sizeX > 40) {
361  st->codec->extradata_size = sizeX - 40;
363  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
364  }
365 
366  /* Extract palette from extradata if bpp <= 8 */
367  /* This code assumes that extradata contains only palette */
368  /* This is true for all paletted codecs implemented in libavcodec */
369  if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
370  int av_unused i;
371 #if HAVE_BIGENDIAN
372  for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
373  asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
374 #else
375  memcpy(asf_st->palette, st->codec->extradata,
377 #endif
378  asf_st->palette_changed = 1;
379  }
380 
381  st->codec->codec_tag = tag1;
383  if(tag1 == MKTAG('D', 'V', 'R', ' ')){
385  // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
386  st->codec->width =
387  st->codec->height = 0;
388  av_freep(&st->codec->extradata);
389  st->codec->extradata_size=0;
390  }
391  if(st->codec->codec_id == CODEC_ID_H264)
393  }
394  pos2 = avio_tell(pb);
395  avio_skip(pb, size - (pos2 - pos1 + 24));
396 
397  return 0;
398 }
399 
401 {
402  ASFContext *asf = s->priv_data;
403  AVIOContext *pb = s->pb;
404  ff_asf_guid g;
405  int ext_len, payload_ext_ct, stream_ct, i;
406  uint32_t leak_rate, stream_num;
407  unsigned int stream_languageid_index;
408 
409  avio_rl64(pb); // starttime
410  avio_rl64(pb); // endtime
411  leak_rate = avio_rl32(pb); // leak-datarate
412  avio_rl32(pb); // bucket-datasize
413  avio_rl32(pb); // init-bucket-fullness
414  avio_rl32(pb); // alt-leak-datarate
415  avio_rl32(pb); // alt-bucket-datasize
416  avio_rl32(pb); // alt-init-bucket-fullness
417  avio_rl32(pb); // max-object-size
418  avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
419  stream_num = avio_rl16(pb); // stream-num
420 
421  stream_languageid_index = avio_rl16(pb); // stream-language-id-index
422  if (stream_num < 128)
423  asf->streams[stream_num].stream_language_index = stream_languageid_index;
424 
425  avio_rl64(pb); // avg frametime in 100ns units
426  stream_ct = avio_rl16(pb); //stream-name-count
427  payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
428 
429  if (stream_num < 128)
430  asf->stream_bitrates[stream_num] = leak_rate;
431 
432  for (i=0; i<stream_ct; i++){
433  avio_rl16(pb);
434  ext_len = avio_rl16(pb);
435  avio_skip(pb, ext_len);
436  }
437 
438  for (i=0; i<payload_ext_ct; i++){
439  ff_get_guid(pb, &g);
440  avio_skip(pb, 2);
441  ext_len=avio_rl32(pb);
442  avio_skip(pb, ext_len);
443  }
444 
445  return 0;
446 }
447 
449 {
450  AVIOContext *pb = s->pb;
451  int len1, len2, len3, len4, len5;
452 
453  len1 = avio_rl16(pb);
454  len2 = avio_rl16(pb);
455  len3 = avio_rl16(pb);
456  len4 = avio_rl16(pb);
457  len5 = avio_rl16(pb);
458  get_tag(s, "title" , 0, len1);
459  get_tag(s, "author" , 0, len2);
460  get_tag(s, "copyright", 0, len3);
461  get_tag(s, "comment" , 0, len4);
462  avio_skip(pb, len5);
463 
464  return 0;
465 }
466 
468 {
469  AVIOContext *pb = s->pb;
470  ASFContext *asf = s->priv_data;
471  int desc_count, i, ret;
472 
473  desc_count = avio_rl16(pb);
474  for(i=0;i<desc_count;i++) {
475  int name_len,value_type,value_len;
476  char name[1024];
477 
478  name_len = avio_rl16(pb);
479  if (name_len%2) // must be even, broken lavf versions wrote len-1
480  name_len += 1;
481  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
482  avio_skip(pb, name_len - ret);
483  value_type = avio_rl16(pb);
484  value_len = avio_rl16(pb);
485  if (!value_type && value_len%2)
486  value_len += 1;
491  if (!strcmp(name, "AspectRatioX")){
492  asf->dar[0].num= get_value(s->pb, value_type);
493  } else if(!strcmp(name, "AspectRatioY")){
494  asf->dar[0].den= get_value(s->pb, value_type);
495  } else
496  get_tag(s, name, value_type, value_len);
497  }
498 
499  return 0;
500 }
501 
503 {
504  AVIOContext *pb = s->pb;
505  ASFContext *asf = s->priv_data;
506  int j, ret;
507  int stream_count = avio_rl16(pb);
508  for(j = 0; j < stream_count; j++) {
509  char lang[6];
510  unsigned int lang_len = avio_r8(pb);
511  if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
512  avio_skip(pb, lang_len - ret);
513  if (j < 128)
514  av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
515  }
516 
517  return 0;
518 }
519 
520 static int asf_read_metadata(AVFormatContext *s, int64_t size)
521 {
522  AVIOContext *pb = s->pb;
523  ASFContext *asf = s->priv_data;
524  int n, stream_num, name_len, value_len, value_num;
525  int ret, i;
526  n = avio_rl16(pb);
527 
528  for(i=0;i<n;i++) {
529  char name[1024];
530 
531  avio_rl16(pb); //lang_list_index
532  stream_num= avio_rl16(pb);
533  name_len= avio_rl16(pb);
534  avio_skip(pb, 2); /* value_type */
535  value_len= avio_rl32(pb);
536 
537  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
538  avio_skip(pb, name_len - ret);
539  //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
540  value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
541  avio_skip(pb, value_len - 2);
542 
543  if(stream_num<128){
544  if (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
545  else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
546  }
547  }
548 
549  return 0;
550 }
551 
552 static int asf_read_marker(AVFormatContext *s, int64_t size)
553 {
554  AVIOContext *pb = s->pb;
555  int i, count, name_len, ret;
556  char name[1024];
557 
558  avio_rl64(pb); // reserved 16 bytes
559  avio_rl64(pb); // ...
560  count = avio_rl32(pb); // markers count
561  avio_rl16(pb); // reserved 2 bytes
562  name_len = avio_rl16(pb); // name length
563  for(i=0;i<name_len;i++){
564  avio_r8(pb); // skip the name
565  }
566 
567  for(i=0;i<count;i++){
568  int64_t pres_time;
569  int name_len;
570 
571  avio_rl64(pb); // offset, 8 bytes
572  pres_time = avio_rl64(pb); // presentation time
573  avio_rl16(pb); // entry length
574  avio_rl32(pb); // send time
575  avio_rl32(pb); // flags
576  name_len = avio_rl32(pb); // name length
577  if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
578  avio_skip(pb, name_len - ret);
579  avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
580  }
581 
582  return 0;
583 }
584 
586 {
587  ASFContext *asf = s->priv_data;
588  ff_asf_guid g;
589  AVIOContext *pb = s->pb;
590  int i;
591  int64_t gsize;
592 
593  ff_get_guid(pb, &g);
594  if (ff_guidcmp(&g, &ff_asf_header))
595  return -1;
596  avio_rl64(pb);
597  avio_rl32(pb);
598  avio_r8(pb);
599  avio_r8(pb);
600  memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
601  for(;;) {
602  uint64_t gpos= avio_tell(pb);
603  ff_get_guid(pb, &g);
604  gsize = avio_rl64(pb);
605  av_dlog(s, "%08"PRIx64": ", gpos);
606  print_guid(&g);
607  av_dlog(s, " size=0x%"PRIx64"\n", gsize);
608  if (!ff_guidcmp(&g, &ff_asf_data_header)) {
609  asf->data_object_offset = avio_tell(pb);
610  // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
611  if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
612  asf->data_object_size = gsize - 24;
613  } else {
614  asf->data_object_size = (uint64_t)-1;
615  }
616  break;
617  }
618  if (gsize < 24)
619  return -1;
620  if (!ff_guidcmp(&g, &ff_asf_file_header)) {
621  int ret = asf_read_file_properties(s, gsize);
622  if (ret < 0)
623  return ret;
624  } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
625  asf_read_stream_properties(s, gsize);
626  } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
627  asf_read_content_desc(s, gsize);
628  } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
629  asf_read_language_list(s, gsize);
630  } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
631  asf_read_ext_content_desc(s, gsize);
632  } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
633  asf_read_metadata(s, gsize);
634  } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
636 
637  // there could be a optional stream properties object to follow
638  // if so the next iteration will pick it up
639  continue;
640  } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
641  ff_get_guid(pb, &g);
642  avio_skip(pb, 6);
643  continue;
644  } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
645  asf_read_marker(s, gsize);
646  } else if (pb->eof_reached) {
647  return -1;
648  } else {
649  if (!s->keylen) {
651  av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
652  } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
653  av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
654  } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
655  av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
656  }
657  }
658  }
659  if(avio_tell(pb) != gpos + gsize)
660  av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
661  avio_seek(pb, gpos + gsize, SEEK_SET);
662  }
663  ff_get_guid(pb, &g);
664  avio_rl64(pb);
665  avio_r8(pb);
666  avio_r8(pb);
667  if (pb->eof_reached)
668  return -1;
669  asf->data_offset = avio_tell(pb);
670  asf->packet_size_left = 0;
671 
672 
673  for(i=0; i<128; i++){
674  int stream_num= asf->asfid2avid[i];
675  if(stream_num>=0){
676  AVStream *st = s->streams[stream_num];
677  if (!st->codec->bit_rate)
678  st->codec->bit_rate = asf->stream_bitrates[i];
679  if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
682  asf->dar[i].num, asf->dar[i].den, INT_MAX);
683  } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
686  asf->dar[0].num, asf->dar[0].den, INT_MAX);
687 
688 //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
689 
690  // copy and convert language codes to the frontend
691  if (asf->streams[i].stream_language_index < 128) {
692  const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
693  if (rfc1766 && strlen(rfc1766) > 1) {
694  const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
695  const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
696  if (iso6392)
697  av_dict_set(&st->metadata, "language", iso6392, 0);
698  }
699  }
700  }
701  }
702 
704 
705  return 0;
706 }
707 
708 #define DO_2BITS(bits, var, defval) \
709  switch (bits & 3) \
710  { \
711  case 3: var = avio_rl32(pb); rsize += 4; break; \
712  case 2: var = avio_rl16(pb); rsize += 2; break; \
713  case 1: var = avio_r8(pb); rsize++; break; \
714  default: var = defval; break; \
715  }
716 
724 {
725  ASFContext *asf = s->priv_data;
726  uint32_t packet_length, padsize;
727  int rsize = 8;
728  int c, d, e, off;
729 
730  // if we do not know packet size, allow skipping up to 32 kB
731  off= 32768;
732  if (s->packet_size > 0)
733  off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
734 
735  c=d=e=-1;
736  while(off-- > 0){
737  c=d; d=e;
738  e= avio_r8(pb);
739  if(c == 0x82 && !d && !e)
740  break;
741  }
742 
743  if (c != 0x82) {
750  if (pb->error == AVERROR(EAGAIN))
751  return AVERROR(EAGAIN);
752  if (!pb->eof_reached)
753  av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
754  }
755  if ((c & 0x8f) == 0x82) {
756  if (d || e) {
757  if (!pb->eof_reached)
758  av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
759  return -1;
760  }
761  c= avio_r8(pb);
762  d= avio_r8(pb);
763  rsize+=3;
764  } else if (!pb->eof_reached) {
765  avio_seek(pb, -1, SEEK_CUR); //FIXME
766  }
767 
768  asf->packet_flags = c;
769  asf->packet_property = d;
770 
771  DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
772  DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
773  DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
774 
775  //the following checks prevent overflows and infinite loops
776  if(!packet_length || packet_length >= (1U<<29)){
777  av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
778  return -1;
779  }
780  if(padsize >= packet_length){
781  av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
782  return -1;
783  }
784 
785  asf->packet_timestamp = avio_rl32(pb);
786  avio_rl16(pb); /* duration */
787  // rsize has at least 11 bytes which have to be present
788 
789  if (asf->packet_flags & 0x01) {
790  asf->packet_segsizetype = avio_r8(pb); rsize++;
791  asf->packet_segments = asf->packet_segsizetype & 0x3f;
792  } else {
793  asf->packet_segments = 1;
794  asf->packet_segsizetype = 0x80;
795  }
796  if (rsize > packet_length - padsize) {
797  asf->packet_size_left = 0;
798  av_log(s, AV_LOG_ERROR,
799  "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
800  rsize, packet_length, padsize, avio_tell(pb));
801  return -1;
802  }
803  asf->packet_size_left = packet_length - padsize - rsize;
804  if (packet_length < asf->hdr.min_pktsize)
805  padsize += asf->hdr.min_pktsize - packet_length;
806  asf->packet_padsize = padsize;
807  av_dlog(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
808  return 0;
809 }
810 
816  ASFContext *asf = s->priv_data;
817  int rsize = 1;
818  int num = avio_r8(pb);
819  int64_t ts0;
820 
821  asf->packet_segments--;
822  asf->packet_key_frame = num >> 7;
823  asf->stream_index = asf->asfid2avid[num & 0x7f];
824  // sequence should be ignored!
825  DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
826  DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
828 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
829  if (asf->packet_replic_size >= 8) {
830  asf->packet_obj_size = avio_rl32(pb);
831  if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
832  av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
833  return -1;
834  }
835  asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
836  if(asf->packet_replic_size >= 8+38+4){
837 // for(i=0; i<asf->packet_replic_size-8; i++)
838 // av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
839 // av_log(s, AV_LOG_DEBUG, "\n");
840  avio_skip(pb, 10);
841  ts0= avio_rl64(pb);
842  avio_skip(pb, 8);;
843  avio_skip(pb, 12);
844  avio_rl32(pb);
845  avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
846  if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
848  }else
849  avio_skip(pb, asf->packet_replic_size - 8);
850  rsize += asf->packet_replic_size; // FIXME - check validity
851  } else if (asf->packet_replic_size==1){
852  // multipacket - frag_offset is beginning timestamp
854  asf->packet_frag_offset = 0;
856 
857  asf->packet_time_delta = avio_r8(pb);
858  rsize++;
859  }else if(asf->packet_replic_size!=0){
860  av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
861  return -1;
862  }
863  if (asf->packet_flags & 0x01) {
864  DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
865  if (rsize > asf->packet_size_left) {
866  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
867  return -1;
868  } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
869  if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
870  av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
871  return -1;
872  } else {
873  int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
874  asf->packet_size_left += diff;
875  asf->packet_padsize -= diff;
876  }
877  }
878  //printf("Fragsize %d\n", asf->packet_frag_size);
879  } else {
880  if (rsize > asf->packet_size_left) {
881  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
882  return -1;
883  }
884  asf->packet_frag_size = asf->packet_size_left - rsize;
885  //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
886  }
887  if (asf->packet_replic_size == 1) {
889  if (asf->packet_multi_size > asf->packet_size_left)
890  return -1;
891  }
892  asf->packet_size_left -= rsize;
893  //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
894 
895  return 0;
896 }
897 
908 {
909  ASFContext *asf = s->priv_data;
910  ASFStream *asf_st = 0;
911  for (;;) {
912  int ret;
913  if(pb->eof_reached)
914  return AVERROR_EOF;
916  || asf->packet_segments < 1) {
917  //asf->packet_size_left <= asf->packet_padsize) {
918  int ret = asf->packet_size_left + asf->packet_padsize;
919  //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
920  assert(ret>=0);
921  /* fail safe */
922  avio_skip(pb, ret);
923 
924  asf->packet_pos= avio_tell(pb);
925  if (asf->data_object_size != (uint64_t)-1 &&
926  (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
927  return AVERROR_EOF; /* Do not exceed the size of the data object */
928  return 1;
929  }
930  if (asf->packet_time_start == 0) {
931  if(asf_read_frame_header(s, pb) < 0){
932  asf->packet_segments= 0;
933  continue;
934  }
935  if (asf->stream_index < 0
936  || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
938  ) {
939  asf->packet_time_start = 0;
940  /* unhandled packet (should not happen) */
941  avio_skip(pb, asf->packet_frag_size);
942  asf->packet_size_left -= asf->packet_frag_size;
943  if(asf->stream_index < 0)
944  av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
945  continue;
946  }
947  asf->asf_st = s->streams[asf->stream_index]->priv_data;
948  }
949  asf_st = asf->asf_st;
950 
951  if (asf->packet_replic_size == 1) {
952  // frag_offset is here used as the beginning timestamp
955  asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
956  asf->packet_size_left--;
957  asf->packet_multi_size--;
958  if (asf->packet_multi_size < asf->packet_obj_size)
959  {
960  asf->packet_time_start = 0;
961  avio_skip(pb, asf->packet_multi_size);
962  asf->packet_size_left -= asf->packet_multi_size;
963  continue;
964  }
965  asf->packet_multi_size -= asf->packet_obj_size;
966  //printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
967  }
968  if( /*asf->packet_frag_size == asf->packet_obj_size*/
969  asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
970  && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
971  av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
972  asf_st->frag_offset, asf->packet_frag_size,
973  asf->packet_obj_size, asf_st->pkt.size);
974  asf->packet_obj_size= asf_st->pkt.size;
975  }
976 
977  if ( asf_st->pkt.size != asf->packet_obj_size
978  || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
979  if(asf_st->pkt.data){
980  av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
981  asf_st->frag_offset = 0;
982  av_free_packet(&asf_st->pkt);
983  }
984  /* new packet */
985  av_new_packet(&asf_st->pkt, asf->packet_obj_size);
986  asf_st->seq = asf->packet_seq;
987  asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
988  asf_st->pkt.stream_index = asf->stream_index;
989  asf_st->pkt.pos =
990  asf_st->packet_pos= asf->packet_pos;
991  if (asf_st->pkt.data && asf_st->palette_changed) {
992  uint8_t *pal;
995  if (!pal) {
996  av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
997  } else {
998  memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
999  asf_st->palette_changed = 0;
1000  }
1001  }
1002 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1003 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1004 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
1006  asf->packet_key_frame = 1;
1007  if (asf->packet_key_frame)
1008  asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1009  }
1010 
1011  /* read data */
1012  //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1013  // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1014  // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1015  asf->packet_size_left -= asf->packet_frag_size;
1016  if (asf->packet_size_left < 0)
1017  continue;
1018 
1019  if( asf->packet_frag_offset >= asf_st->pkt.size
1020  || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
1021  av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
1022  asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
1023  continue;
1024  }
1025 
1026  ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1027  asf->packet_frag_size);
1028  if (ret != asf->packet_frag_size) {
1029  if (ret < 0 || asf->packet_frag_offset + ret == 0)
1030  return ret < 0 ? ret : AVERROR_EOF;
1031  if (asf_st->ds_span > 1) {
1032  // scrambling, we can either drop it completely or fill the remainder
1033  // TODO: should we fill the whole packet instead of just the current
1034  // fragment?
1035  memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1036  asf->packet_frag_size - ret);
1037  ret = asf->packet_frag_size;
1038  } else
1039  // no scrambling, so we can return partial packets
1040  av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1041  }
1042  if (s->key && s->keylen == 20)
1043  ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1044  ret);
1045  asf_st->frag_offset += ret;
1046  /* test if whole packet is read */
1047  if (asf_st->frag_offset == asf_st->pkt.size) {
1048  //workaround for macroshit radio DVR-MS files
1050  && asf_st->pkt.size > 100){
1051  int i;
1052  for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
1053  if(i == asf_st->pkt.size){
1054  av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1055  asf_st->frag_offset = 0;
1056  av_free_packet(&asf_st->pkt);
1057  continue;
1058  }
1059  }
1060 
1061  /* return packet */
1062  if (asf_st->ds_span > 1) {
1063  if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
1064  av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
1065  }else{
1066  /* packet descrambling */
1067  uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
1068  if (newdata) {
1069  int offset = 0;
1070  memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1071  while (offset < asf_st->pkt.size) {
1072  int off = offset / asf_st->ds_chunk_size;
1073  int row = off / asf_st->ds_span;
1074  int col = off % asf_st->ds_span;
1075  int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1076  //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
1077 
1078  assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1079  assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1080  memcpy(newdata + offset,
1081  asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1082  asf_st->ds_chunk_size);
1083  offset += asf_st->ds_chunk_size;
1084  }
1085  av_free(asf_st->pkt.data);
1086  asf_st->pkt.data = newdata;
1087  }
1088  }
1089  }
1090  asf_st->frag_offset = 0;
1091  *pkt= asf_st->pkt;
1092  //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1093  asf_st->pkt.size = 0;
1094  asf_st->pkt.data = 0;
1095  asf_st->pkt.side_data_elems = 0;
1096  asf_st->pkt.side_data = NULL;
1097  break; // packet completed
1098  }
1099  }
1100  return 0;
1101 }
1102 
1104 {
1105  ASFContext *asf = s->priv_data;
1106 
1107  for (;;) {
1108  int ret;
1109 
1110  /* parse cached packets, if any */
1111  if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1112  return ret;
1113  if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1114  assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1115  asf->packet_time_start = 0;
1116  }
1117 }
1118 
1119 // Added to support seeking after packets have been read
1120 // If information is not reset, read_packet fails due to
1121 // leftover information from previous reads
1123 {
1124  ASFContext *asf = s->priv_data;
1125  ASFStream *asf_st;
1126  int i;
1127 
1128  asf->packet_size_left = 0;
1129  asf->packet_segments = 0;
1130  asf->packet_flags = 0;
1131  asf->packet_property = 0;
1132  asf->packet_timestamp = 0;
1133  asf->packet_segsizetype = 0;
1134  asf->packet_segments = 0;
1135  asf->packet_seq = 0;
1136  asf->packet_replic_size = 0;
1137  asf->packet_key_frame = 0;
1138  asf->packet_padsize = 0;
1139  asf->packet_frag_offset = 0;
1140  asf->packet_frag_size = 0;
1141  asf->packet_frag_timestamp = 0;
1142  asf->packet_multi_size = 0;
1143  asf->packet_obj_size = 0;
1144  asf->packet_time_delta = 0;
1145  asf->packet_time_start = 0;
1146 
1147  for(i=0; i<s->nb_streams; i++){
1148  asf_st= s->streams[i]->priv_data;
1149  av_free_packet(&asf_st->pkt);
1150  asf_st->frag_offset=0;
1151  asf_st->seq=0;
1152  }
1153  asf->asf_st= NULL;
1154 }
1155 
1157 {
1158  asf_reset_header(s);
1159 
1160  return 0;
1161 }
1162 
1163 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1164 {
1165  AVPacket pkt1, *pkt = &pkt1;
1166  ASFStream *asf_st;
1167  int64_t pts;
1168  int64_t pos= *ppos;
1169  int i;
1170  int64_t start_pos[ASF_MAX_STREAMS];
1171 
1172  for(i=0; i<s->nb_streams; i++){
1173  start_pos[i]= pos;
1174  }
1175 
1176  if (s->packet_size > 0)
1177  pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1178  *ppos= pos;
1179  avio_seek(s->pb, pos, SEEK_SET);
1180 
1181 //printf("asf_read_pts\n");
1182  asf_reset_header(s);
1183  for(;;){
1184  if (asf_read_packet(s, pkt) < 0){
1185  av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1186  return AV_NOPTS_VALUE;
1187  }
1188 
1189  pts = pkt->dts;
1190 
1191  av_free_packet(pkt);
1192  if(pkt->flags&AV_PKT_FLAG_KEY){
1193  i= pkt->stream_index;
1194 
1195  asf_st= s->streams[i]->priv_data;
1196 
1197 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1198  pos= asf_st->packet_pos;
1199 
1200  av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1201  start_pos[i]= asf_st->packet_pos + 1;
1202 
1203  if(pkt->stream_index == stream_index)
1204  break;
1205  }
1206  }
1207 
1208  *ppos= pos;
1209 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1210 
1211  return pts;
1212 }
1213 
1214 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1215 {
1216  ff_asf_guid g;
1217  ASFContext *asf = s->priv_data;
1218  int64_t current_pos= avio_tell(s->pb);
1219  int i;
1220 
1221  avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1222  ff_get_guid(s->pb, &g);
1223 
1224  /* the data object can be followed by other top-level objects,
1225  skip them until the simple index object is reached */
1226  while (ff_guidcmp(&g, &index_guid)) {
1227  int64_t gsize= avio_rl64(s->pb);
1228  if (gsize < 24 || s->pb->eof_reached) {
1229  avio_seek(s->pb, current_pos, SEEK_SET);
1230  return;
1231  }
1232  avio_skip(s->pb, gsize-24);
1233  ff_get_guid(s->pb, &g);
1234  }
1235 
1236  {
1237  int64_t itime, last_pos=-1;
1238  int pct, ict;
1239  int64_t av_unused gsize= avio_rl64(s->pb);
1240  ff_get_guid(s->pb, &g);
1241  itime=avio_rl64(s->pb);
1242  pct=avio_rl32(s->pb);
1243  ict=avio_rl32(s->pb);
1244  av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1245 
1246  for (i=0;i<ict;i++){
1247  int pktnum=avio_rl32(s->pb);
1248  int pktct =avio_rl16(s->pb);
1249  int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1250  int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1251 
1252  if(pos != last_pos){
1253  av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n", pktnum, pktct, index_pts);
1254  av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1255  last_pos=pos;
1256  }
1257  }
1258  asf->index_read= 1;
1259  }
1260  avio_seek(s->pb, current_pos, SEEK_SET);
1261 }
1262 
1263 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1264 {
1265  ASFContext *asf = s->priv_data;
1266  AVStream *st = s->streams[stream_index];
1267  int64_t pos;
1268  int index;
1269 
1270  if (s->packet_size <= 0)
1271  return -1;
1272 
1273  /* Try using the protocol's read_seek if available */
1274  if(s->pb) {
1275  int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1276  if(ret >= 0)
1277  asf_reset_header(s);
1278  if (ret != AVERROR(ENOSYS))
1279  return ret;
1280  }
1281 
1282  if (!asf->index_read)
1283  asf_build_simple_index(s, stream_index);
1284 
1285  if((asf->index_read && st->index_entries)){
1286  index= av_index_search_timestamp(st, pts, flags);
1287  if(index >= 0) {
1288  /* find the position */
1289  pos = st->index_entries[index].pos;
1290 
1291  /* do the seek */
1292  av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1293  avio_seek(s->pb, pos, SEEK_SET);
1294  asf_reset_header(s);
1295  return 0;
1296  }
1297  }
1298  /* no index or seeking by index failed */
1299  if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1300  return -1;
1301  asf_reset_header(s);
1302  return 0;
1303 }
1304 
1306  .name = "asf",
1307  .long_name = NULL_IF_CONFIG_SMALL("ASF format"),
1308  .priv_data_size = sizeof(ASFContext),
1309  .read_probe = asf_probe,
1314  .read_timestamp = asf_read_pts,
1316 };