Libav
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 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/common.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/opt.h"
31 #include "avformat.h"
32 #include "avio_internal.h"
33 #include "avlanguage.h"
34 #include "id3v2.h"
35 #include "internal.h"
36 #include "riff.h"
37 #include "asf.h"
38 #include "asfcrypt.h"
39 
40 typedef struct {
41  const AVClass *class;
42  int asfid2avid[128];
43  ASFStream streams[128];
44  uint32_t stream_bitrates[128];
45  AVRational dar[128];
46  char stream_languages[128][6];
47  /* non streamed additonnal info */
48  /* packet filling */
50  /* only for reading */
51  uint64_t data_offset;
52  uint64_t data_object_offset;
53  uint64_t data_object_size;
55 
57 
67  unsigned int packet_frag_offset;
68  unsigned int packet_frag_size;
74  int64_t packet_pos;
75 
77 
79 
81 } ASFContext;
82 
83 static const AVOption options[] = {
84  { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
85  { NULL },
86 };
87 
88 static const AVClass asf_class = {
89  .class_name = "asf demuxer",
90  .item_name = av_default_item_name,
91  .option = options,
92  .version = LIBAVUTIL_VERSION_INT,
93 };
94 
95 #undef NDEBUG
96 #include <assert.h>
97 
98 #define ASF_MAX_STREAMS 127
99 #define FRAME_HEADER_SIZE 17
100 // Fix Me! FRAME_HEADER_SIZE may be different.
101 
102 static const ff_asf_guid index_guid = {
103  0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
104 };
105 
106 #ifdef DEBUG
107 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
108  0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
109 };
110 
111 #define PRINT_IF_GUID(g, cmp) \
112  if (!ff_guidcmp(g, &cmp)) \
113  av_dlog(NULL, "(GUID: %s) ", # cmp)
114 
115 static void print_guid(ff_asf_guid *g)
116 {
117  int i;
118  PRINT_IF_GUID(g, ff_asf_header);
119  else PRINT_IF_GUID(g, ff_asf_file_header);
120  else PRINT_IF_GUID(g, ff_asf_stream_header);
121  else PRINT_IF_GUID(g, ff_asf_audio_stream);
122  else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
123  else PRINT_IF_GUID(g, ff_asf_video_stream);
124  else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
125  else PRINT_IF_GUID(g, ff_asf_command_stream);
126  else PRINT_IF_GUID(g, ff_asf_comment_header);
127  else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
128  else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
129  else PRINT_IF_GUID(g, ff_asf_data_header);
130  else PRINT_IF_GUID(g, index_guid);
131  else PRINT_IF_GUID(g, ff_asf_head1_guid);
132  else PRINT_IF_GUID(g, ff_asf_head2_guid);
133  else PRINT_IF_GUID(g, ff_asf_my_guid);
134  else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
135  else PRINT_IF_GUID(g, ff_asf_extended_content_header);
136  else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
137  else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
138  else PRINT_IF_GUID(g, ff_asf_metadata_header);
139  else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
140  else PRINT_IF_GUID(g, ff_asf_marker_header);
141  else PRINT_IF_GUID(g, stream_bitrate_guid);
142  else PRINT_IF_GUID(g, ff_asf_language_guid);
143  else
144  av_dlog(NULL, "(GUID: unknown) ");
145  for (i = 0; i < 16; i++)
146  av_dlog(NULL, " 0x%02x,", (*g)[i]);
147  av_dlog(NULL, "}\n");
148 }
149 #undef PRINT_IF_GUID
150 #else
151 #define print_guid(g)
152 #endif
153 
154 static int asf_probe(AVProbeData *pd)
155 {
156  /* check file header */
157  if (!ff_guidcmp(pd->buf, &ff_asf_header))
158  return AVPROBE_SCORE_MAX;
159  else
160  return 0;
161 }
162 
163 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
164  * but 16 bit for "Metadata Object" and "Metadata Library Object" */
165 static int get_value(AVIOContext *pb, int type, int type2_size)
166 {
167  switch (type) {
168  case 2:
169  return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
170  case 3:
171  return avio_rl32(pb);
172  case 4:
173  return avio_rl64(pb);
174  case 5:
175  return avio_rl16(pb);
176  default:
177  return INT_MIN;
178  }
179 }
180 
181 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
182  * but in reality this is only loosely similar */
184 {
185  AVPacket pkt = { 0 };
186  const CodecMime *mime = ff_id3v2_mime_tags;
187  enum AVCodecID id = AV_CODEC_ID_NONE;
188  char mimetype[64];
189  uint8_t *desc = NULL;
190  AVStream *st = NULL;
191  int ret, type, picsize, desc_len;
192 
193  /* type + picsize + mime + desc */
194  if (len < 1 + 4 + 2 + 2) {
195  av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
196  return AVERROR_INVALIDDATA;
197  }
198 
199  /* picture type */
200  type = avio_r8(s->pb);
201  len--;
202  if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
203  av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
204  type = 0;
205  }
206 
207  /* picture data size */
208  picsize = avio_rl32(s->pb);
209  len -= 4;
210 
211  /* picture MIME type */
212  len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
213  while (mime->id != AV_CODEC_ID_NONE) {
214  if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
215  id = mime->id;
216  break;
217  }
218  mime++;
219  }
220  if (id == AV_CODEC_ID_NONE) {
221  av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
222  mimetype);
223  return 0;
224  }
225 
226  if (picsize >= len) {
227  av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
228  picsize, len);
229  return AVERROR_INVALIDDATA;
230  }
231 
232  /* picture description */
233  desc_len = (len - picsize) * 2 + 1;
234  desc = av_malloc(desc_len);
235  if (!desc)
236  return AVERROR(ENOMEM);
237  len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
238 
239  ret = av_get_packet(s->pb, &pkt, picsize);
240  if (ret < 0)
241  goto fail;
242 
243  st = avformat_new_stream(s, NULL);
244  if (!st) {
245  ret = AVERROR(ENOMEM);
246  goto fail;
247  }
250  st->codec->codec_id = id;
251  st->attached_pic = pkt;
252  st->attached_pic.stream_index = st->index;
254 
255  if (*desc)
256  av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
257  else
258  av_freep(&desc);
259 
260  av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
261 
262  return 0;
263 
264 fail:
265  av_freep(&desc);
266  av_free_packet(&pkt);
267  return ret;
268 }
269 
270 static void get_id3_tag(AVFormatContext *s, int len)
271 {
272  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
273 
274  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
275  if (id3v2_extra_meta)
276  ff_id3v2_parse_apic(s, &id3v2_extra_meta);
277  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
278 }
279 
280 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
281 {
282  char *value;
283  int64_t off = avio_tell(s->pb);
284 
285  if ((unsigned)len >= (UINT_MAX - 1) / 2)
286  return;
287 
288  value = av_malloc(2 * len + 1);
289  if (!value)
290  goto finish;
291 
292  if (type == 0) { // UTF16-LE
293  avio_get_str16le(s->pb, len, value, 2 * len + 1);
294  } else if (type == 1) { // byte array
295  if (!strcmp(key, "WM/Picture")) { // handle cover art
296  asf_read_picture(s, len);
297  } else if (!strcmp(key, "ID3")) { // handle ID3 tag
298  get_id3_tag(s, len);
299  } else {
300  av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
301  }
302  goto finish;
303  } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
304  uint64_t num = get_value(s->pb, type, type2_size);
305  snprintf(value, len, "%"PRIu64, num);
306  } else if (type == 6) { // (don't) handle GUID
307  av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
308  goto finish;
309  } else {
310  av_log(s, AV_LOG_DEBUG,
311  "Unsupported value type %d in tag %s.\n", type, key);
312  goto finish;
313  }
314  if (*value)
315  av_dict_set(&s->metadata, key, value, 0);
316 
317 finish:
318  av_freep(&value);
319  avio_seek(s->pb, off + len, SEEK_SET);
320 }
321 
323 {
324  ASFContext *asf = s->priv_data;
325  AVIOContext *pb = s->pb;
326 
327  ff_get_guid(pb, &asf->hdr.guid);
328  asf->hdr.file_size = avio_rl64(pb);
329  asf->hdr.create_time = avio_rl64(pb);
330  avio_rl64(pb); /* number of packets */
331  asf->hdr.play_time = avio_rl64(pb);
332  asf->hdr.send_time = avio_rl64(pb);
333  asf->hdr.preroll = avio_rl32(pb);
334  asf->hdr.ignore = avio_rl32(pb);
335  asf->hdr.flags = avio_rl32(pb);
336  asf->hdr.min_pktsize = avio_rl32(pb);
337  asf->hdr.max_pktsize = avio_rl32(pb);
338  if (asf->hdr.min_pktsize >= (1U << 29))
339  return AVERROR_INVALIDDATA;
340  asf->hdr.max_bitrate = avio_rl32(pb);
341  s->packet_size = asf->hdr.max_pktsize;
342 
343  return 0;
344 }
345 
347 {
348  ASFContext *asf = s->priv_data;
349  AVIOContext *pb = s->pb;
350  AVStream *st;
351  ASFStream *asf_st;
352  ff_asf_guid g;
353  enum AVMediaType type;
354  int type_specific_size, sizeX;
355  unsigned int tag1;
356  int64_t pos1, pos2, start_time;
357  int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
358 
359  if (s->nb_streams == ASF_MAX_STREAMS) {
360  av_log(s, AV_LOG_ERROR, "too many streams\n");
361  return AVERROR(EINVAL);
362  }
363 
364  pos1 = avio_tell(pb);
365 
366  st = avformat_new_stream(s, NULL);
367  if (!st)
368  return AVERROR(ENOMEM);
369  avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
370  asf_st = av_mallocz(sizeof(ASFStream));
371  if (!asf_st)
372  return AVERROR(ENOMEM);
373  st->priv_data = asf_st;
374  st->start_time = 0;
375  start_time = asf->hdr.preroll;
376 
377  asf_st->stream_language_index = 128; // invalid stream index means no language info
378 
379  if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
380  st->duration = asf->hdr.play_time /
381  (10000000 / 1000) - start_time;
382  }
383  ff_get_guid(pb, &g);
384 
385  test_for_ext_stream_audio = 0;
386  if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
387  type = AVMEDIA_TYPE_AUDIO;
388  } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
389  type = AVMEDIA_TYPE_VIDEO;
390  } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
391  type = AVMEDIA_TYPE_VIDEO;
393  } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
394  type = AVMEDIA_TYPE_DATA;
396  test_for_ext_stream_audio = 1;
397  type = AVMEDIA_TYPE_UNKNOWN;
398  } else {
399  return -1;
400  }
401  ff_get_guid(pb, &g);
402  avio_skip(pb, 8); /* total_size */
403  type_specific_size = avio_rl32(pb);
404  avio_rl32(pb);
405  st->id = avio_rl16(pb) & 0x7f; /* stream id */
406  // mapping of asf ID to AV stream ID;
407  asf->asfid2avid[st->id] = s->nb_streams - 1;
408 
409  avio_rl32(pb);
410 
411  if (test_for_ext_stream_audio) {
412  ff_get_guid(pb, &g);
414  type = AVMEDIA_TYPE_AUDIO;
415  is_dvr_ms_audio = 1;
416  ff_get_guid(pb, &g);
417  avio_rl32(pb);
418  avio_rl32(pb);
419  avio_rl32(pb);
420  ff_get_guid(pb, &g);
421  avio_rl32(pb);
422  }
423  }
424 
425  st->codec->codec_type = type;
426  if (type == AVMEDIA_TYPE_AUDIO) {
427  int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
428  if (ret < 0)
429  return ret;
430  if (is_dvr_ms_audio) {
431  // codec_id and codec_tag are unreliable in dvr_ms
432  // files. Set them later by probing stream.
434  st->codec->codec_tag = 0;
435  }
436  if (st->codec->codec_id == AV_CODEC_ID_AAC)
438  else
440  /* We have to init the frame size at some point .... */
441  pos2 = avio_tell(pb);
442  if (size >= (pos2 + 8 - pos1 + 24)) {
443  asf_st->ds_span = avio_r8(pb);
444  asf_st->ds_packet_size = avio_rl16(pb);
445  asf_st->ds_chunk_size = avio_rl16(pb);
446  avio_rl16(pb); // ds_data_size
447  avio_r8(pb); // ds_silence_data
448  }
449  if (asf_st->ds_span > 1) {
450  if (!asf_st->ds_chunk_size ||
451  (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
452  asf_st->ds_packet_size % asf_st->ds_chunk_size)
453  asf_st->ds_span = 0; // disable descrambling
454  }
455  } else if (type == AVMEDIA_TYPE_VIDEO &&
456  size - (avio_tell(pb) - pos1 + 24) >= 51) {
457  avio_rl32(pb);
458  avio_rl32(pb);
459  avio_r8(pb);
460  avio_rl16(pb); /* size */
461  sizeX = avio_rl32(pb); /* size */
462  st->codec->width = avio_rl32(pb);
463  st->codec->height = avio_rl32(pb);
464  /* not available for asf */
465  avio_rl16(pb); /* panes */
466  st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
467  tag1 = avio_rl32(pb);
468  avio_skip(pb, 20);
469  if (sizeX > 40) {
470  st->codec->extradata_size = sizeX - 40;
473  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
474  }
475 
476  /* Extract palette from extradata if bpp <= 8 */
477  /* This code assumes that extradata contains only palette */
478  /* This is true for all paletted codecs implemented in libavcodec */
479  if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
480 #if HAVE_BIGENDIAN
481  int i;
482  for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
483  asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
484 #else
485  memcpy(asf_st->palette, st->codec->extradata,
487 #endif
488  asf_st->palette_changed = 1;
489  }
490 
491  st->codec->codec_tag = tag1;
493  if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
495  /* issue658 contains wrong w/h and MS even puts a fake seq header
496  * with wrong w/h in extradata while a correct one is in the stream.
497  * maximum lameness */
498  st->codec->width =
499  st->codec->height = 0;
500  av_freep(&st->codec->extradata);
501  st->codec->extradata_size = 0;
502  }
503  if (st->codec->codec_id == AV_CODEC_ID_H264)
505  }
506  pos2 = avio_tell(pb);
507  avio_skip(pb, size - (pos2 - pos1 + 24));
508 
509  return 0;
510 }
511 
513 {
514  ASFContext *asf = s->priv_data;
515  AVIOContext *pb = s->pb;
516  ff_asf_guid g;
517  int ext_len, payload_ext_ct, stream_ct, i;
518  uint32_t leak_rate, stream_num;
519  unsigned int stream_languageid_index;
520 
521  avio_rl64(pb); // starttime
522  avio_rl64(pb); // endtime
523  leak_rate = avio_rl32(pb); // leak-datarate
524  avio_rl32(pb); // bucket-datasize
525  avio_rl32(pb); // init-bucket-fullness
526  avio_rl32(pb); // alt-leak-datarate
527  avio_rl32(pb); // alt-bucket-datasize
528  avio_rl32(pb); // alt-init-bucket-fullness
529  avio_rl32(pb); // max-object-size
530  avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
531  stream_num = avio_rl16(pb); // stream-num
532 
533  stream_languageid_index = avio_rl16(pb); // stream-language-id-index
534  if (stream_num < 128)
535  asf->streams[stream_num].stream_language_index = stream_languageid_index;
536 
537  avio_rl64(pb); // avg frametime in 100ns units
538  stream_ct = avio_rl16(pb); // stream-name-count
539  payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
540 
541  if (stream_num < 128)
542  asf->stream_bitrates[stream_num] = leak_rate;
543 
544  for (i = 0; i < stream_ct; i++) {
545  avio_rl16(pb);
546  ext_len = avio_rl16(pb);
547  avio_skip(pb, ext_len);
548  }
549 
550  for (i = 0; i < payload_ext_ct; i++) {
551  ff_get_guid(pb, &g);
552  avio_skip(pb, 2);
553  ext_len = avio_rl32(pb);
554  avio_skip(pb, ext_len);
555  }
556 
557  return 0;
558 }
559 
561 {
562  AVIOContext *pb = s->pb;
563  int len1, len2, len3, len4, len5;
564 
565  len1 = avio_rl16(pb);
566  len2 = avio_rl16(pb);
567  len3 = avio_rl16(pb);
568  len4 = avio_rl16(pb);
569  len5 = avio_rl16(pb);
570  get_tag(s, "title", 0, len1, 32);
571  get_tag(s, "author", 0, len2, 32);
572  get_tag(s, "copyright", 0, len3, 32);
573  get_tag(s, "comment", 0, len4, 32);
574  avio_skip(pb, len5);
575 
576  return 0;
577 }
578 
580 {
581  AVIOContext *pb = s->pb;
582  ASFContext *asf = s->priv_data;
583  int desc_count, i, ret;
584 
585  desc_count = avio_rl16(pb);
586  for (i = 0; i < desc_count; i++) {
587  int name_len, value_type, value_len;
588  char name[1024];
589 
590  name_len = avio_rl16(pb);
591  if (name_len % 2) // must be even, broken lavf versions wrote len-1
592  name_len += 1;
593  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
594  avio_skip(pb, name_len - ret);
595  value_type = avio_rl16(pb);
596  value_len = avio_rl16(pb);
597  if (!value_type && value_len % 2)
598  value_len += 1;
599  /* My sample has that stream set to 0 maybe that mean the container.
600  * ASF stream count starts at 1. I am using 0 to the container value
601  * since it's unused. */
602  if (!strcmp(name, "AspectRatioX"))
603  asf->dar[0].num = get_value(s->pb, value_type, 32);
604  else if (!strcmp(name, "AspectRatioY"))
605  asf->dar[0].den = get_value(s->pb, value_type, 32);
606  else
607  get_tag(s, name, value_type, value_len, 32);
608  }
609 
610  return 0;
611 }
612 
614 {
615  AVIOContext *pb = s->pb;
616  ASFContext *asf = s->priv_data;
617  int j, ret;
618  int stream_count = avio_rl16(pb);
619  for (j = 0; j < stream_count; j++) {
620  char lang[6];
621  unsigned int lang_len = avio_r8(pb);
622  if ((ret = avio_get_str16le(pb, lang_len, lang,
623  sizeof(lang))) < lang_len)
624  avio_skip(pb, lang_len - ret);
625  if (j < 128)
626  av_strlcpy(asf->stream_languages[j], lang,
627  sizeof(*asf->stream_languages));
628  }
629 
630  return 0;
631 }
632 
633 static int asf_read_metadata(AVFormatContext *s, int64_t size)
634 {
635  AVIOContext *pb = s->pb;
636  ASFContext *asf = s->priv_data;
637  int n, stream_num, name_len, value_len;
638  int ret, i;
639  n = avio_rl16(pb);
640 
641  for (i = 0; i < n; i++) {
642  char name[1024];
643  int value_type;
644 
645  avio_rl16(pb); // lang_list_index
646  stream_num = avio_rl16(pb);
647  name_len = avio_rl16(pb);
648  value_type = avio_rl16(pb); /* value_type */
649  value_len = avio_rl32(pb);
650 
651  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
652  avio_skip(pb, name_len - ret);
653  av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
654  i, stream_num, name_len, value_type, value_len, name);
655 
656  if (!strcmp(name, "AspectRatioX")){
657  int aspect_x = get_value(s->pb, value_type, 16);
658  if(stream_num < 128)
659  asf->dar[stream_num].num = aspect_x;
660  } else if(!strcmp(name, "AspectRatioY")){
661  int aspect_y = get_value(s->pb, value_type, 16);
662  if(stream_num < 128)
663  asf->dar[stream_num].den = aspect_y;
664  } else {
665  get_tag(s, name, value_type, value_len, 16);
666  }
667  }
668 
669  return 0;
670 }
671 
672 static int asf_read_marker(AVFormatContext *s, int64_t size)
673 {
674  AVIOContext *pb = s->pb;
675  ASFContext *asf = s->priv_data;
676  int i, count, name_len, ret;
677  char name[1024];
678 
679  avio_rl64(pb); // reserved 16 bytes
680  avio_rl64(pb); // ...
681  count = avio_rl32(pb); // markers count
682  avio_rl16(pb); // reserved 2 bytes
683  name_len = avio_rl16(pb); // name length
684  for (i = 0; i < name_len; i++)
685  avio_r8(pb); // skip the name
686 
687  for (i = 0; i < count; i++) {
688  int64_t pres_time;
689  int name_len;
690 
691  avio_rl64(pb); // offset, 8 bytes
692  pres_time = avio_rl64(pb); // presentation time
693  pres_time -= asf->hdr.preroll * 10000;
694  avio_rl16(pb); // entry length
695  avio_rl32(pb); // send time
696  avio_rl32(pb); // flags
697  name_len = avio_rl32(pb); // name length
698  if ((ret = avio_get_str16le(pb, name_len * 2, name,
699  sizeof(name))) < name_len)
700  avio_skip(pb, name_len - ret);
701  avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
703  }
704 
705  return 0;
706 }
707 
709 {
710  ASFContext *asf = s->priv_data;
711  ff_asf_guid g;
712  AVIOContext *pb = s->pb;
713  int i;
714  int64_t gsize;
715 
716  ff_get_guid(pb, &g);
717  if (ff_guidcmp(&g, &ff_asf_header))
718  return -1;
719  avio_rl64(pb);
720  avio_rl32(pb);
721  avio_r8(pb);
722  avio_r8(pb);
723  memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
724  for (;;) {
725  uint64_t gpos = avio_tell(pb);
726  ff_get_guid(pb, &g);
727  gsize = avio_rl64(pb);
728  print_guid(&g);
729  if (!ff_guidcmp(&g, &ff_asf_data_header)) {
730  asf->data_object_offset = avio_tell(pb);
731  /* If not streaming, gsize is not unlimited (how?),
732  * and there is enough space in the file.. */
733  if (!(asf->hdr.flags & 0x01) && gsize >= 100)
734  asf->data_object_size = gsize - 24;
735  else
736  asf->data_object_size = (uint64_t)-1;
737  break;
738  }
739  if (gsize < 24)
740  return -1;
741  if (!ff_guidcmp(&g, &ff_asf_file_header)) {
742  int ret = asf_read_file_properties(s, gsize);
743  if (ret < 0)
744  return ret;
745  } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
746  int ret = asf_read_stream_properties(s, gsize);
747  if (ret < 0)
748  return ret;
749  } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
750  asf_read_content_desc(s, gsize);
751  } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
752  asf_read_language_list(s, gsize);
753  } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
754  asf_read_ext_content_desc(s, gsize);
755  } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
756  asf_read_metadata(s, gsize);
757  } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
758  asf_read_metadata(s, gsize);
759  } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
761 
762  // there could be a optional stream properties object to follow
763  // if so the next iteration will pick it up
764  continue;
765  } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
766  ff_get_guid(pb, &g);
767  avio_skip(pb, 6);
768  continue;
769  } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
770  asf_read_marker(s, gsize);
771  } else if (pb->eof_reached) {
772  return -1;
773  } else {
774  if (!s->keylen) {
777  "DRM protected stream detected, decoding will likely fail!\n");
778  } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
780  "Ext DRM protected stream detected, decoding will likely fail!\n");
781  } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
783  "Digital signature detected, decoding will likely fail!\n");
784  }
785  }
786  }
787  if (avio_tell(pb) != gpos + gsize)
788  av_log(s, AV_LOG_DEBUG,
789  "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
790  avio_tell(pb) - gpos, gsize);
791  avio_seek(pb, gpos + gsize, SEEK_SET);
792  }
793  ff_get_guid(pb, &g);
794  avio_rl64(pb);
795  avio_r8(pb);
796  avio_r8(pb);
797  if (pb->eof_reached)
798  return -1;
799  asf->data_offset = avio_tell(pb);
800  asf->packet_size_left = 0;
801 
802  for (i = 0; i < 128; i++) {
803  int stream_num = asf->asfid2avid[i];
804  if (stream_num >= 0) {
805  AVStream *st = s->streams[stream_num];
806  if (!st->codec->bit_rate)
807  st->codec->bit_rate = asf->stream_bitrates[i];
808  if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
811  asf->dar[i].num, asf->dar[i].den, INT_MAX);
812  } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
813  // Use ASF container value if the stream doesn't set AR.
817  asf->dar[0].num, asf->dar[0].den, INT_MAX);
818 
819  av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
820  i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
822 
823  // copy and convert language codes to the frontend
824  if (asf->streams[i].stream_language_index < 128) {
825  const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
826  if (rfc1766 && strlen(rfc1766) > 1) {
827  const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
828  const char *iso6392 = av_convert_lang_to(primary_tag,
830  if (iso6392)
831  av_dict_set(&st->metadata, "language", iso6392, 0);
832  }
833  }
834  }
835  }
836 
838 
839  return 0;
840 }
841 
842 #define DO_2BITS(bits, var, defval) \
843  switch (bits & 3) { \
844  case 3: \
845  var = avio_rl32(pb); \
846  rsize += 4; \
847  break; \
848  case 2: \
849  var = avio_rl16(pb); \
850  rsize += 2; \
851  break; \
852  case 1: \
853  var = avio_r8(pb); \
854  rsize++; \
855  break; \
856  default: \
857  var = defval; \
858  break; \
859  }
860 
868 {
869  ASFContext *asf = s->priv_data;
870  uint32_t packet_length, padsize;
871  int rsize = 8;
872  int c, d, e, off;
873 
874  // if we do not know packet size, allow skipping up to 32 kB
875  off = 32768;
876  if (asf->no_resync_search)
877  off = 3;
878  else if (s->packet_size > 0)
879  off = (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
880 
881  c = d = e = -1;
882  while (off-- > 0) {
883  c = d;
884  d = e;
885  e = avio_r8(pb);
886  if (c == 0x82 && !d && !e)
887  break;
888  }
889 
890  if (c != 0x82) {
891  /* This code allows handling of -EAGAIN at packet boundaries (i.e.
892  * if the packet sync code above triggers -EAGAIN). This does not
893  * imply complete -EAGAIN handling support at random positions in
894  * the stream. */
895  if (pb->error == AVERROR(EAGAIN))
896  return AVERROR(EAGAIN);
897  if (!pb->eof_reached)
898  av_log(s, AV_LOG_ERROR,
899  "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
900  }
901  if ((c & 0x8f) == 0x82) {
902  if (d || e) {
903  if (!pb->eof_reached)
904  av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
905  return -1;
906  }
907  c = avio_r8(pb);
908  d = avio_r8(pb);
909  rsize += 3;
910  } else if (!pb->eof_reached) {
911  avio_seek(pb, -1, SEEK_CUR); // FIXME
912  }
913 
914  asf->packet_flags = c;
915  asf->packet_property = d;
916 
917  DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
918  DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
919  DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
920 
921  // the following checks prevent overflows and infinite loops
922  if (!packet_length || packet_length >= (1U << 29)) {
923  av_log(s, AV_LOG_ERROR,
924  "invalid packet_length %d at:%"PRId64"\n",
925  packet_length, avio_tell(pb));
926  return -1;
927  }
928  if (padsize >= packet_length) {
929  av_log(s, AV_LOG_ERROR,
930  "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
931  return -1;
932  }
933 
934  asf->packet_timestamp = avio_rl32(pb);
935  avio_rl16(pb); /* duration */
936  // rsize has at least 11 bytes which have to be present
937 
938  if (asf->packet_flags & 0x01) {
939  asf->packet_segsizetype = avio_r8(pb);
940  rsize++;
941  asf->packet_segments = asf->packet_segsizetype & 0x3f;
942  } else {
943  asf->packet_segments = 1;
944  asf->packet_segsizetype = 0x80;
945  }
946  if (rsize > packet_length - padsize) {
947  asf->packet_size_left = 0;
948  av_log(s, AV_LOG_ERROR,
949  "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
950  rsize, packet_length, padsize, avio_tell(pb));
951  return -1;
952  }
953  asf->packet_size_left = packet_length - padsize - rsize;
954  if (packet_length < asf->hdr.min_pktsize)
955  padsize += asf->hdr.min_pktsize - packet_length;
956  asf->packet_padsize = padsize;
957  av_dlog(s, "packet: size=%d padsize=%d left=%d\n",
959  return 0;
960 }
961 
967 {
968  ASFContext *asf = s->priv_data;
969  int rsize = 1;
970  int num = avio_r8(pb);
971  int64_t ts0;
972 
973  asf->packet_segments--;
974  asf->packet_key_frame = num >> 7;
975  asf->stream_index = asf->asfid2avid[num & 0x7f];
976  // sequence should be ignored!
977  DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
978  DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
980  av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
981  asf->packet_key_frame, asf->stream_index, asf->packet_seq,
983  if (asf->packet_replic_size >= 8) {
984  asf->packet_obj_size = avio_rl32(pb);
985  if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) {
986  av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
987  return -1;
988  }
989  asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
990  if (asf->packet_replic_size >= 8 + 38 + 4) {
991  avio_skip(pb, 10);
992  ts0 = avio_rl64(pb);
993  avio_skip(pb, 8);
994  avio_skip(pb, 12);
995  avio_rl32(pb);
996  avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
997  if (ts0 != -1)
998  asf->packet_frag_timestamp = ts0 / 10000;
999  else
1001  } else
1002  avio_skip(pb, asf->packet_replic_size - 8);
1003  rsize += asf->packet_replic_size; // FIXME - check validity
1004  } else if (asf->packet_replic_size == 1) {
1005  // multipacket - frag_offset is beginning timestamp
1007  asf->packet_frag_offset = 0;
1009 
1010  asf->packet_time_delta = avio_r8(pb);
1011  rsize++;
1012  } else if (asf->packet_replic_size != 0) {
1013  av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1014  asf->packet_replic_size);
1015  return -1;
1016  }
1017  if (asf->packet_flags & 0x01) {
1018  DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1019  if (rsize > asf->packet_size_left) {
1020  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1021  return -1;
1022  } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1023  if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1024  av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
1025  asf->packet_size_left, rsize);
1026  return -1;
1027  } else {
1028  int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1029  asf->packet_size_left += diff;
1030  asf->packet_padsize -= diff;
1031  }
1032  }
1033  } else {
1034  if (rsize > asf->packet_size_left) {
1035  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1036  return -1;
1037  }
1038  asf->packet_frag_size = asf->packet_size_left - rsize;
1039  }
1040  if (asf->packet_replic_size == 1) {
1041  asf->packet_multi_size = asf->packet_frag_size;
1042  if (asf->packet_multi_size > asf->packet_size_left)
1043  return -1;
1044  }
1045  asf->packet_size_left -= rsize;
1046 
1047  return 0;
1048 }
1049 
1060 {
1061  ASFContext *asf = s->priv_data;
1062  ASFStream *asf_st = 0;
1063  for (;;) {
1064  int ret;
1065 
1066  if (pb->eof_reached)
1067  return AVERROR_EOF;
1068 
1069  if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1070  asf->packet_segments < 1) {
1071  int ret = asf->packet_size_left + asf->packet_padsize;
1072 
1073  assert(ret >= 0);
1074  /* fail safe */
1075  avio_skip(pb, ret);
1076 
1077  asf->packet_pos = avio_tell(pb);
1078  if (asf->data_object_size != (uint64_t)-1 &&
1079  (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1080  return AVERROR_EOF; /* Do not exceed the size of the data object */
1081  return 1;
1082  }
1083  if (asf->packet_time_start == 0) {
1084  if (asf_read_frame_header(s, pb) < 0) {
1085  asf->packet_segments = 0;
1086  continue;
1087  }
1088  if (asf->stream_index < 0 ||
1089  s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1090  (!asf->packet_key_frame &&
1091  s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
1092  asf->packet_time_start = 0;
1093  /* unhandled packet (should not happen) */
1094  avio_skip(pb, asf->packet_frag_size);
1095  asf->packet_size_left -= asf->packet_frag_size;
1096  if (asf->stream_index < 0)
1097  av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1098  asf->packet_frag_size);
1099  continue;
1100  }
1101  asf->asf_st = s->streams[asf->stream_index]->priv_data;
1102  }
1103  asf_st = asf->asf_st;
1104  av_assert0(asf_st);
1105 
1106  if (!asf_st->frag_offset && asf->packet_frag_offset) {
1107  av_dlog(s, "skipping asf data pkt with fragment offset for "
1108  "stream:%d, expected:%d but got %d from pkt)\n",
1109  asf->stream_index, asf_st->frag_offset,
1110  asf->packet_frag_offset);
1111  avio_skip(pb, asf->packet_frag_size);
1112  asf->packet_size_left -= asf->packet_frag_size;
1113  continue;
1114  }
1115 
1116  if (asf->packet_replic_size == 1) {
1117  // frag_offset is here used as the beginning timestamp
1119  asf->packet_time_start += asf->packet_time_delta;
1120  asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1121  asf->packet_size_left--;
1122  asf->packet_multi_size--;
1123  if (asf->packet_multi_size < asf->packet_obj_size) {
1124  asf->packet_time_start = 0;
1125  avio_skip(pb, asf->packet_multi_size);
1126  asf->packet_size_left -= asf->packet_multi_size;
1127  continue;
1128  }
1129  asf->packet_multi_size -= asf->packet_obj_size;
1130  }
1131  if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
1132  asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
1133  av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
1134  asf_st->frag_offset, asf->packet_frag_size,
1135  asf->packet_obj_size, asf_st->pkt.size);
1136  asf->packet_obj_size = asf_st->pkt.size;
1137  }
1138 
1139  if (asf_st->pkt.size != asf->packet_obj_size ||
1140  // FIXME is this condition sufficient?
1141  asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1142  if (asf_st->pkt.data) {
1143  av_log(s, AV_LOG_INFO,
1144  "freeing incomplete packet size %d, new %d\n",
1145  asf_st->pkt.size, asf->packet_obj_size);
1146  asf_st->frag_offset = 0;
1147  av_free_packet(&asf_st->pkt);
1148  }
1149  /* new packet */
1150  av_new_packet(&asf_st->pkt, asf->packet_obj_size);
1151  asf_st->seq = asf->packet_seq;
1152  asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1153  asf_st->pkt.stream_index = asf->stream_index;
1154  asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1155 
1156  if (asf_st->pkt.data && asf_st->palette_changed) {
1157  uint8_t *pal;
1159  AVPALETTE_SIZE);
1160  if (!pal) {
1161  av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1162  } else {
1163  memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1164  asf_st->palette_changed = 0;
1165  }
1166  }
1167  av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1168  asf->stream_index, asf->packet_key_frame,
1169  asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1171  asf->packet_obj_size);
1173  asf->packet_key_frame = 1;
1174  if (asf->packet_key_frame)
1175  asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1176  }
1177 
1178  /* read data */
1179  av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1180  s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1181  asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1182  asf->packet_size_left -= asf->packet_frag_size;
1183  if (asf->packet_size_left < 0)
1184  continue;
1185 
1186  if (asf->packet_frag_offset >= asf_st->pkt.size ||
1187  asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1188  av_log(s, AV_LOG_ERROR,
1189  "packet fragment position invalid %u,%u not in %u\n",
1191  asf_st->pkt.size);
1192  continue;
1193  }
1194 
1195  ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1196  asf->packet_frag_size);
1197  if (ret != asf->packet_frag_size) {
1198  if (ret < 0 || asf->packet_frag_offset + ret == 0)
1199  return ret < 0 ? ret : AVERROR_EOF;
1200 
1201  if (asf_st->ds_span > 1) {
1202  // scrambling, we can either drop it completely or fill the remainder
1203  // TODO: should we fill the whole packet instead of just the current
1204  // fragment?
1205  memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1206  asf->packet_frag_size - ret);
1207  ret = asf->packet_frag_size;
1208  } else {
1209  // no scrambling, so we can return partial packets
1210  av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1211  }
1212  }
1213  if (s->key && s->keylen == 20)
1214  ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1215  ret);
1216  asf_st->frag_offset += ret;
1217  /* test if whole packet is read */
1218  if (asf_st->frag_offset == asf_st->pkt.size) {
1219  // workaround for macroshit radio DVR-MS files
1221  asf_st->pkt.size > 100) {
1222  int i;
1223  for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1224  ;
1225  if (i == asf_st->pkt.size) {
1226  av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1227  asf_st->frag_offset = 0;
1228  av_free_packet(&asf_st->pkt);
1229  continue;
1230  }
1231  }
1232 
1233  /* return packet */
1234  if (asf_st->ds_span > 1) {
1235  if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1236  av_log(s, AV_LOG_ERROR,
1237  "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1238  asf_st->pkt.size, asf_st->ds_packet_size,
1239  asf_st->ds_span);
1240  } else {
1241  /* packet descrambling */
1242  AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
1244  if (buf) {
1245  uint8_t *newdata = buf->data;
1246  int offset = 0;
1247  memset(newdata + asf_st->pkt.size, 0,
1249  while (offset < asf_st->pkt.size) {
1250  int off = offset / asf_st->ds_chunk_size;
1251  int row = off / asf_st->ds_span;
1252  int col = off % asf_st->ds_span;
1253  int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1254  assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1255  assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1256  memcpy(newdata + offset,
1257  asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1258  asf_st->ds_chunk_size);
1259  offset += asf_st->ds_chunk_size;
1260  }
1261  av_buffer_unref(&asf_st->pkt.buf);
1262  asf_st->pkt.buf = buf;
1263  asf_st->pkt.data = buf->data;
1264  }
1265  }
1266  }
1267  asf_st->frag_offset = 0;
1268  *pkt = asf_st->pkt;
1269 #if FF_API_DESTRUCT_PACKET
1271  asf_st->pkt.destruct = NULL;
1273 #endif
1274  asf_st->pkt.buf = 0;
1275  asf_st->pkt.size = 0;
1276  asf_st->pkt.data = 0;
1277  asf_st->pkt.side_data_elems = 0;
1278  asf_st->pkt.side_data = NULL;
1279  break; // packet completed
1280  }
1281  }
1282  return 0;
1283 }
1284 
1286 {
1287  ASFContext *asf = s->priv_data;
1288 
1289  for (;;) {
1290  int ret;
1291 
1292  /* parse cached packets, if any */
1293  if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
1294  return ret;
1295  if ((ret = asf_get_packet(s, s->pb)) < 0)
1296  assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1297  asf->packet_segments < 1);
1298  asf->packet_time_start = 0;
1299  }
1300 }
1301 
1302 // Added to support seeking after packets have been read
1303 // If information is not reset, read_packet fails due to
1304 // leftover information from previous reads
1306 {
1307  ASFContext *asf = s->priv_data;
1308  ASFStream *asf_st;
1309  int i;
1310 
1311  asf->packet_size_left = 0;
1312  asf->packet_segments = 0;
1313  asf->packet_flags = 0;
1314  asf->packet_property = 0;
1315  asf->packet_timestamp = 0;
1316  asf->packet_segsizetype = 0;
1317  asf->packet_segments = 0;
1318  asf->packet_seq = 0;
1319  asf->packet_replic_size = 0;
1320  asf->packet_key_frame = 0;
1321  asf->packet_padsize = 0;
1322  asf->packet_frag_offset = 0;
1323  asf->packet_frag_size = 0;
1324  asf->packet_frag_timestamp = 0;
1325  asf->packet_multi_size = 0;
1326  asf->packet_obj_size = 0;
1327  asf->packet_time_delta = 0;
1328  asf->packet_time_start = 0;
1329 
1330  for (i = 0; i < s->nb_streams; i++) {
1331  asf_st = s->streams[i]->priv_data;
1332  if (!asf_st)
1333  continue;
1334  av_free_packet(&asf_st->pkt);
1335  asf_st->frag_offset = 0;
1336  asf_st->seq = 0;
1337  }
1338  asf->asf_st = NULL;
1339 }
1340 
1342 {
1343  asf_reset_header(s);
1344 
1345  return 0;
1346 }
1347 
1348 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1349  int64_t *ppos, int64_t pos_limit)
1350 {
1351  AVPacket pkt1, *pkt = &pkt1;
1352  ASFStream *asf_st;
1353  int64_t pts;
1354  int64_t pos = *ppos;
1355  int i;
1356  int64_t start_pos[ASF_MAX_STREAMS];
1357 
1358  for (i = 0; i < s->nb_streams; i++)
1359  start_pos[i] = pos;
1360 
1361  if (s->packet_size > 0)
1362  pos = (pos + s->packet_size - 1 - s->data_offset) /
1363  s->packet_size * s->packet_size +
1364  s->data_offset;
1365  *ppos = pos;
1366  avio_seek(s->pb, pos, SEEK_SET);
1367 
1368  asf_reset_header(s);
1369  for (;;) {
1370  if (asf_read_packet(s, pkt) < 0) {
1371  av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1372  return AV_NOPTS_VALUE;
1373  }
1374 
1375  pts = pkt->dts;
1376 
1377  av_free_packet(pkt);
1378  if (pkt->flags & AV_PKT_FLAG_KEY) {
1379  i = pkt->stream_index;
1380 
1381  asf_st = s->streams[i]->priv_data;
1382  av_assert0(asf_st);
1383 
1384 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1385  pos = asf_st->packet_pos;
1386 
1387  av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1388  pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1389  start_pos[i] = asf_st->packet_pos + 1;
1390 
1391  if (pkt->stream_index == stream_index)
1392  break;
1393  }
1394  }
1395 
1396  *ppos = pos;
1397  return pts;
1398 }
1399 
1400 static int asf_build_simple_index(AVFormatContext *s, int stream_index)
1401 {
1402  ff_asf_guid g;
1403  ASFContext *asf = s->priv_data;
1404  int64_t current_pos = avio_tell(s->pb);
1405  int i, ret = 0;
1406 
1407  avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1408  if ((ret = ff_get_guid(s->pb, &g)) < 0)
1409  goto end;
1410 
1411  /* the data object can be followed by other top-level objects,
1412  * skip them until the simple index object is reached */
1413  while (ff_guidcmp(&g, &index_guid)) {
1414  int64_t gsize = avio_rl64(s->pb);
1415  if (gsize < 24 || s->pb->eof_reached) {
1416  goto end;
1417  }
1418  avio_skip(s->pb, gsize - 24);
1419  if ((ret = ff_get_guid(s->pb, &g)) < 0)
1420  goto end;
1421  }
1422 
1423  {
1424  int64_t itime, last_pos = -1;
1425  int pct, ict;
1426  int64_t av_unused gsize = avio_rl64(s->pb);
1427  if ((ret = ff_get_guid(s->pb, &g)) < 0)
1428  goto end;
1429  itime = avio_rl64(s->pb);
1430  pct = avio_rl32(s->pb);
1431  ict = avio_rl32(s->pb);
1432  av_log(s, AV_LOG_DEBUG,
1433  "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1434 
1435  for (i = 0; i < ict; i++) {
1436  int pktnum = avio_rl32(s->pb);
1437  int pktct = avio_rl16(s->pb);
1438  int64_t pos = s->data_offset + s->packet_size * (int64_t)pktnum;
1439  int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1440 
1441  if (pos != last_pos) {
1442  av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1443  pktnum, pktct, index_pts);
1444  av_add_index_entry(s->streams[stream_index], pos, index_pts,
1445  s->packet_size, 0, AVINDEX_KEYFRAME);
1446  last_pos = pos;
1447  }
1448  }
1449  asf->index_read = ict > 0;
1450  }
1451 end:
1452  if (s->pb->eof_reached)
1453  ret = 0;
1454  avio_seek(s->pb, current_pos, SEEK_SET);
1455  return ret;
1456 }
1457 
1458 static int asf_read_seek(AVFormatContext *s, int stream_index,
1459  int64_t pts, int flags)
1460 {
1461  ASFContext *asf = s->priv_data;
1462  AVStream *st = s->streams[stream_index];
1463  int64_t pos;
1464  int index, ret = 0;
1465 
1466  if (s->packet_size <= 0)
1467  return -1;
1468 
1469  /* Try using the protocol's read_seek if available */
1470  if (s->pb) {
1471  int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1472  if (ret >= 0)
1473  asf_reset_header(s);
1474  if (ret != AVERROR(ENOSYS))
1475  return ret;
1476  }
1477 
1478  /* explicitly handle the case of seeking to 0 */
1479  if (!pts) {
1480  asf_reset_header(s);
1481  avio_seek(s->pb, s->data_offset, SEEK_SET);
1482  return 0;
1483  }
1484 
1485  if (!asf->index_read)
1486  ret = asf_build_simple_index(s, stream_index);
1487 
1488  if (!ret && asf->index_read && st->index_entries) {
1489  index = av_index_search_timestamp(st, pts, flags);
1490  if (index >= 0) {
1491  /* find the position */
1492  pos = st->index_entries[index].pos;
1493 
1494  /* do the seek */
1495  av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1496  avio_seek(s->pb, pos, SEEK_SET);
1497  asf_reset_header(s);
1498  return 0;
1499  }
1500  }
1501  /* no index or seeking by index failed */
1502  if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1503  return -1;
1504  asf_reset_header(s);
1505  return 0;
1506 }
1507 
1509  .name = "asf",
1510  .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1511  .priv_data_size = sizeof(ASFContext),
1512  .read_probe = asf_probe,
1517  .read_timestamp = asf_read_pts,
1519  .priv_class = &asf_class,
1520 };