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  int ret = asf_read_stream_properties(s, gsize);
626  if (ret < 0)
627  return ret;
628  } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
629  asf_read_content_desc(s, gsize);
630  } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
631  asf_read_language_list(s, gsize);
632  } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
633  asf_read_ext_content_desc(s, gsize);
634  } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
635  asf_read_metadata(s, gsize);
636  } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
638 
639  // there could be a optional stream properties object to follow
640  // if so the next iteration will pick it up
641  continue;
642  } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
643  ff_get_guid(pb, &g);
644  avio_skip(pb, 6);
645  continue;
646  } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
647  asf_read_marker(s, gsize);
648  } else if (pb->eof_reached) {
649  return -1;
650  } else {
651  if (!s->keylen) {
653  av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
654  } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
655  av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
656  } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
657  av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
658  }
659  }
660  }
661  if(avio_tell(pb) != gpos + gsize)
662  av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
663  avio_seek(pb, gpos + gsize, SEEK_SET);
664  }
665  ff_get_guid(pb, &g);
666  avio_rl64(pb);
667  avio_r8(pb);
668  avio_r8(pb);
669  if (pb->eof_reached)
670  return -1;
671  asf->data_offset = avio_tell(pb);
672  asf->packet_size_left = 0;
673 
674 
675  for(i=0; i<128; i++){
676  int stream_num= asf->asfid2avid[i];
677  if(stream_num>=0){
678  AVStream *st = s->streams[stream_num];
679  if (!st->codec->bit_rate)
680  st->codec->bit_rate = asf->stream_bitrates[i];
681  if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
684  asf->dar[i].num, asf->dar[i].den, INT_MAX);
685  } 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.
688  asf->dar[0].num, asf->dar[0].den, INT_MAX);
689 
690 //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);
691 
692  // copy and convert language codes to the frontend
693  if (asf->streams[i].stream_language_index < 128) {
694  const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
695  if (rfc1766 && strlen(rfc1766) > 1) {
696  const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
697  const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
698  if (iso6392)
699  av_dict_set(&st->metadata, "language", iso6392, 0);
700  }
701  }
702  }
703  }
704 
706 
707  return 0;
708 }
709 
710 #define DO_2BITS(bits, var, defval) \
711  switch (bits & 3) \
712  { \
713  case 3: var = avio_rl32(pb); rsize += 4; break; \
714  case 2: var = avio_rl16(pb); rsize += 2; break; \
715  case 1: var = avio_r8(pb); rsize++; break; \
716  default: var = defval; break; \
717  }
718 
726 {
727  ASFContext *asf = s->priv_data;
728  uint32_t packet_length, padsize;
729  int rsize = 8;
730  int c, d, e, off;
731 
732  // if we do not know packet size, allow skipping up to 32 kB
733  off= 32768;
734  if (s->packet_size > 0)
735  off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
736 
737  c=d=e=-1;
738  while(off-- > 0){
739  c=d; d=e;
740  e= avio_r8(pb);
741  if(c == 0x82 && !d && !e)
742  break;
743  }
744 
745  if (c != 0x82) {
752  if (pb->error == AVERROR(EAGAIN))
753  return AVERROR(EAGAIN);
754  if (!pb->eof_reached)
755  av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
756  }
757  if ((c & 0x8f) == 0x82) {
758  if (d || e) {
759  if (!pb->eof_reached)
760  av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
761  return -1;
762  }
763  c= avio_r8(pb);
764  d= avio_r8(pb);
765  rsize+=3;
766  } else if (!pb->eof_reached) {
767  avio_seek(pb, -1, SEEK_CUR); //FIXME
768  }
769 
770  asf->packet_flags = c;
771  asf->packet_property = d;
772 
773  DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
774  DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
775  DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
776 
777  //the following checks prevent overflows and infinite loops
778  if(!packet_length || packet_length >= (1U<<29)){
779  av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
780  return -1;
781  }
782  if(padsize >= packet_length){
783  av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
784  return -1;
785  }
786 
787  asf->packet_timestamp = avio_rl32(pb);
788  avio_rl16(pb); /* duration */
789  // rsize has at least 11 bytes which have to be present
790 
791  if (asf->packet_flags & 0x01) {
792  asf->packet_segsizetype = avio_r8(pb); rsize++;
793  asf->packet_segments = asf->packet_segsizetype & 0x3f;
794  } else {
795  asf->packet_segments = 1;
796  asf->packet_segsizetype = 0x80;
797  }
798  if (rsize > packet_length - padsize) {
799  asf->packet_size_left = 0;
800  av_log(s, AV_LOG_ERROR,
801  "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
802  rsize, packet_length, padsize, avio_tell(pb));
803  return -1;
804  }
805  asf->packet_size_left = packet_length - padsize - rsize;
806  if (packet_length < asf->hdr.min_pktsize)
807  padsize += asf->hdr.min_pktsize - packet_length;
808  asf->packet_padsize = padsize;
809  av_dlog(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
810  return 0;
811 }
812 
818  ASFContext *asf = s->priv_data;
819  int rsize = 1;
820  int num = avio_r8(pb);
821  int64_t ts0;
822 
823  asf->packet_segments--;
824  asf->packet_key_frame = num >> 7;
825  asf->stream_index = asf->asfid2avid[num & 0x7f];
826  // sequence should be ignored!
827  DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
828  DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
830 //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);
831  if (asf->packet_replic_size >= 8) {
832  asf->packet_obj_size = avio_rl32(pb);
833  if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
834  av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
835  return -1;
836  }
837  asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
838  if(asf->packet_replic_size >= 8+38+4){
839 // for(i=0; i<asf->packet_replic_size-8; i++)
840 // av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
841 // av_log(s, AV_LOG_DEBUG, "\n");
842  avio_skip(pb, 10);
843  ts0= avio_rl64(pb);
844  avio_skip(pb, 8);;
845  avio_skip(pb, 12);
846  avio_rl32(pb);
847  avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
848  if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
850  }else
851  avio_skip(pb, asf->packet_replic_size - 8);
852  rsize += asf->packet_replic_size; // FIXME - check validity
853  } else if (asf->packet_replic_size==1){
854  // multipacket - frag_offset is beginning timestamp
856  asf->packet_frag_offset = 0;
858 
859  asf->packet_time_delta = avio_r8(pb);
860  rsize++;
861  }else if(asf->packet_replic_size!=0){
862  av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
863  return -1;
864  }
865  if (asf->packet_flags & 0x01) {
866  DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
867  if (rsize > asf->packet_size_left) {
868  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
869  return -1;
870  } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
871  if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
872  av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
873  return -1;
874  } else {
875  int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
876  asf->packet_size_left += diff;
877  asf->packet_padsize -= diff;
878  }
879  }
880  //printf("Fragsize %d\n", asf->packet_frag_size);
881  } else {
882  if (rsize > asf->packet_size_left) {
883  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
884  return -1;
885  }
886  asf->packet_frag_size = asf->packet_size_left - rsize;
887  //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
888  }
889  if (asf->packet_replic_size == 1) {
891  if (asf->packet_multi_size > asf->packet_size_left)
892  return -1;
893  }
894  asf->packet_size_left -= rsize;
895  //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
896 
897  return 0;
898 }
899 
910 {
911  ASFContext *asf = s->priv_data;
912  ASFStream *asf_st = 0;
913  for (;;) {
914  int ret;
915  if(pb->eof_reached)
916  return AVERROR_EOF;
918  || asf->packet_segments < 1) {
919  //asf->packet_size_left <= asf->packet_padsize) {
920  int ret = asf->packet_size_left + asf->packet_padsize;
921  //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
922  assert(ret>=0);
923  /* fail safe */
924  avio_skip(pb, ret);
925 
926  asf->packet_pos= avio_tell(pb);
927  if (asf->data_object_size != (uint64_t)-1 &&
928  (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
929  return AVERROR_EOF; /* Do not exceed the size of the data object */
930  return 1;
931  }
932  if (asf->packet_time_start == 0) {
933  if(asf_read_frame_header(s, pb) < 0){
934  asf->packet_segments= 0;
935  continue;
936  }
937  if (asf->stream_index < 0
938  || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
940  ) {
941  asf->packet_time_start = 0;
942  /* unhandled packet (should not happen) */
943  avio_skip(pb, asf->packet_frag_size);
944  asf->packet_size_left -= asf->packet_frag_size;
945  if(asf->stream_index < 0)
946  av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
947  continue;
948  }
949  asf->asf_st = s->streams[asf->stream_index]->priv_data;
950  }
951  asf_st = asf->asf_st;
952 
953  if (asf->packet_replic_size == 1) {
954  // frag_offset is here used as the beginning timestamp
957  asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
958  asf->packet_size_left--;
959  asf->packet_multi_size--;
960  if (asf->packet_multi_size < asf->packet_obj_size)
961  {
962  asf->packet_time_start = 0;
963  avio_skip(pb, asf->packet_multi_size);
964  asf->packet_size_left -= asf->packet_multi_size;
965  continue;
966  }
967  asf->packet_multi_size -= asf->packet_obj_size;
968  //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);
969  }
970  if( /*asf->packet_frag_size == asf->packet_obj_size*/
971  asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
972  && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
973  av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
974  asf_st->frag_offset, asf->packet_frag_size,
975  asf->packet_obj_size, asf_st->pkt.size);
976  asf->packet_obj_size= asf_st->pkt.size;
977  }
978 
979  if ( asf_st->pkt.size != asf->packet_obj_size
980  || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
981  if(asf_st->pkt.data){
982  av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
983  asf_st->frag_offset = 0;
984  av_free_packet(&asf_st->pkt);
985  }
986  /* new packet */
987  av_new_packet(&asf_st->pkt, asf->packet_obj_size);
988  asf_st->seq = asf->packet_seq;
989  asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
990  asf_st->pkt.stream_index = asf->stream_index;
991  asf_st->pkt.pos =
992  asf_st->packet_pos= asf->packet_pos;
993  if (asf_st->pkt.data && asf_st->palette_changed) {
994  uint8_t *pal;
997  if (!pal) {
998  av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
999  } else {
1000  memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1001  asf_st->palette_changed = 0;
1002  }
1003  }
1004 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1005 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1006 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
1008  asf->packet_key_frame = 1;
1009  if (asf->packet_key_frame)
1010  asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1011  }
1012 
1013  /* read data */
1014  //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1015  // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1016  // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1017  asf->packet_size_left -= asf->packet_frag_size;
1018  if (asf->packet_size_left < 0)
1019  continue;
1020 
1021  if( asf->packet_frag_offset >= asf_st->pkt.size
1022  || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
1023  av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
1024  asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
1025  continue;
1026  }
1027 
1028  ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1029  asf->packet_frag_size);
1030  if (ret != asf->packet_frag_size) {
1031  if (ret < 0 || asf->packet_frag_offset + ret == 0)
1032  return ret < 0 ? ret : AVERROR_EOF;
1033  if (asf_st->ds_span > 1) {
1034  // scrambling, we can either drop it completely or fill the remainder
1035  // TODO: should we fill the whole packet instead of just the current
1036  // fragment?
1037  memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1038  asf->packet_frag_size - ret);
1039  ret = asf->packet_frag_size;
1040  } else
1041  // no scrambling, so we can return partial packets
1042  av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1043  }
1044  if (s->key && s->keylen == 20)
1045  ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1046  ret);
1047  asf_st->frag_offset += ret;
1048  /* test if whole packet is read */
1049  if (asf_st->frag_offset == asf_st->pkt.size) {
1050  //workaround for macroshit radio DVR-MS files
1052  && asf_st->pkt.size > 100){
1053  int i;
1054  for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
1055  if(i == asf_st->pkt.size){
1056  av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1057  asf_st->frag_offset = 0;
1058  av_free_packet(&asf_st->pkt);
1059  continue;
1060  }
1061  }
1062 
1063  /* return packet */
1064  if (asf_st->ds_span > 1) {
1065  if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
1066  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);
1067  }else{
1068  /* packet descrambling */
1069  uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
1070  if (newdata) {
1071  int offset = 0;
1072  memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1073  while (offset < asf_st->pkt.size) {
1074  int off = offset / asf_st->ds_chunk_size;
1075  int row = off / asf_st->ds_span;
1076  int col = off % asf_st->ds_span;
1077  int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1078  //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
1079 
1080  assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1081  assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1082  memcpy(newdata + offset,
1083  asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1084  asf_st->ds_chunk_size);
1085  offset += asf_st->ds_chunk_size;
1086  }
1087  av_free(asf_st->pkt.data);
1088  asf_st->pkt.data = newdata;
1089  }
1090  }
1091  }
1092  asf_st->frag_offset = 0;
1093  *pkt= asf_st->pkt;
1094  //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1095  asf_st->pkt.size = 0;
1096  asf_st->pkt.data = 0;
1097  asf_st->pkt.side_data_elems = 0;
1098  asf_st->pkt.side_data = NULL;
1099  break; // packet completed
1100  }
1101  }
1102  return 0;
1103 }
1104 
1106 {
1107  ASFContext *asf = s->priv_data;
1108 
1109  for (;;) {
1110  int ret;
1111 
1112  /* parse cached packets, if any */
1113  if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1114  return ret;
1115  if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1116  assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1117  asf->packet_time_start = 0;
1118  }
1119 }
1120 
1121 // Added to support seeking after packets have been read
1122 // If information is not reset, read_packet fails due to
1123 // leftover information from previous reads
1125 {
1126  ASFContext *asf = s->priv_data;
1127  ASFStream *asf_st;
1128  int i;
1129 
1130  asf->packet_size_left = 0;
1131  asf->packet_segments = 0;
1132  asf->packet_flags = 0;
1133  asf->packet_property = 0;
1134  asf->packet_timestamp = 0;
1135  asf->packet_segsizetype = 0;
1136  asf->packet_segments = 0;
1137  asf->packet_seq = 0;
1138  asf->packet_replic_size = 0;
1139  asf->packet_key_frame = 0;
1140  asf->packet_padsize = 0;
1141  asf->packet_frag_offset = 0;
1142  asf->packet_frag_size = 0;
1143  asf->packet_frag_timestamp = 0;
1144  asf->packet_multi_size = 0;
1145  asf->packet_obj_size = 0;
1146  asf->packet_time_delta = 0;
1147  asf->packet_time_start = 0;
1148 
1149  for(i=0; i<s->nb_streams; i++){
1150  asf_st= s->streams[i]->priv_data;
1151  av_free_packet(&asf_st->pkt);
1152  asf_st->frag_offset=0;
1153  asf_st->seq=0;
1154  }
1155  asf->asf_st= NULL;
1156 }
1157 
1159 {
1160  asf_reset_header(s);
1161 
1162  return 0;
1163 }
1164 
1165 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1166 {
1167  AVPacket pkt1, *pkt = &pkt1;
1168  ASFStream *asf_st;
1169  int64_t pts;
1170  int64_t pos= *ppos;
1171  int i;
1172  int64_t start_pos[ASF_MAX_STREAMS];
1173 
1174  for(i=0; i<s->nb_streams; i++){
1175  start_pos[i]= pos;
1176  }
1177 
1178  if (s->packet_size > 0)
1179  pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1180  *ppos= pos;
1181  avio_seek(s->pb, pos, SEEK_SET);
1182 
1183 //printf("asf_read_pts\n");
1184  asf_reset_header(s);
1185  for(;;){
1186  if (asf_read_packet(s, pkt) < 0){
1187  av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1188  return AV_NOPTS_VALUE;
1189  }
1190 
1191  pts = pkt->dts;
1192 
1193  av_free_packet(pkt);
1194  if(pkt->flags&AV_PKT_FLAG_KEY){
1195  i= pkt->stream_index;
1196 
1197  asf_st= s->streams[i]->priv_data;
1198 
1199 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1200  pos= asf_st->packet_pos;
1201 
1202  av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1203  start_pos[i]= asf_st->packet_pos + 1;
1204 
1205  if(pkt->stream_index == stream_index)
1206  break;
1207  }
1208  }
1209 
1210  *ppos= pos;
1211 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1212 
1213  return pts;
1214 }
1215 
1216 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1217 {
1218  ff_asf_guid g;
1219  ASFContext *asf = s->priv_data;
1220  int64_t current_pos= avio_tell(s->pb);
1221  int i;
1222 
1223  avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1224  ff_get_guid(s->pb, &g);
1225 
1226  /* the data object can be followed by other top-level objects,
1227  skip them until the simple index object is reached */
1228  while (ff_guidcmp(&g, &index_guid)) {
1229  int64_t gsize= avio_rl64(s->pb);
1230  if (gsize < 24 || s->pb->eof_reached) {
1231  avio_seek(s->pb, current_pos, SEEK_SET);
1232  return;
1233  }
1234  avio_skip(s->pb, gsize-24);
1235  ff_get_guid(s->pb, &g);
1236  }
1237 
1238  {
1239  int64_t itime, last_pos=-1;
1240  int pct, ict;
1241  int64_t av_unused gsize= avio_rl64(s->pb);
1242  ff_get_guid(s->pb, &g);
1243  itime=avio_rl64(s->pb);
1244  pct=avio_rl32(s->pb);
1245  ict=avio_rl32(s->pb);
1246  av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1247 
1248  for (i=0;i<ict;i++){
1249  int pktnum=avio_rl32(s->pb);
1250  int pktct =avio_rl16(s->pb);
1251  int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1252  int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1253 
1254  if(pos != last_pos){
1255  av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n", pktnum, pktct, index_pts);
1256  av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1257  last_pos=pos;
1258  }
1259  }
1260  asf->index_read= 1;
1261  }
1262  avio_seek(s->pb, current_pos, SEEK_SET);
1263 }
1264 
1265 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1266 {
1267  ASFContext *asf = s->priv_data;
1268  AVStream *st = s->streams[stream_index];
1269  int64_t pos;
1270  int index;
1271 
1272  if (s->packet_size <= 0)
1273  return -1;
1274 
1275  /* Try using the protocol's read_seek if available */
1276  if(s->pb) {
1277  int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1278  if(ret >= 0)
1279  asf_reset_header(s);
1280  if (ret != AVERROR(ENOSYS))
1281  return ret;
1282  }
1283 
1284  if (!asf->index_read)
1285  asf_build_simple_index(s, stream_index);
1286 
1287  if((asf->index_read && st->index_entries)){
1288  index= av_index_search_timestamp(st, pts, flags);
1289  if(index >= 0) {
1290  /* find the position */
1291  pos = st->index_entries[index].pos;
1292 
1293  /* do the seek */
1294  av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1295  avio_seek(s->pb, pos, SEEK_SET);
1296  asf_reset_header(s);
1297  return 0;
1298  }
1299  }
1300  /* no index or seeking by index failed */
1301  if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1302  return -1;
1303  asf_reset_header(s);
1304  return 0;
1305 }
1306 
1308  .name = "asf",
1309  .long_name = NULL_IF_CONFIG_SMALL("ASF format"),
1310  .priv_data_size = sizeof(ASFContext),
1311  .read_probe = asf_probe,
1316  .read_timestamp = asf_read_pts,
1318 };