FFmpeg  1.2.12
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 FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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/attributes.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/common.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/opt.h"
32 #include "avformat.h"
33 #include "avio_internal.h"
34 #include "avlanguage.h"
35 #include "id3v2.h"
36 #include "internal.h"
37 #include "riff.h"
38 #include "asf.h"
39 #include "asfcrypt.h"
40 
41 typedef struct {
42  const AVClass *class;
43  int asfid2avid[128];
44  ASFStream streams[128];
45  uint32_t stream_bitrates[128];
46  AVRational dar[128];
47  char stream_languages[128][6];
48  /* non streamed additonnal info */
49  /* packet filling */
51  /* only for reading */
52  uint64_t data_offset;
53  uint64_t data_object_offset;
54  uint64_t data_object_size;
56 
58 
68  unsigned int packet_frag_offset;
69  unsigned int packet_frag_size;
75  int64_t packet_pos;
76 
78 
80 
82 } ASFContext;
83 
84 static const AVOption options[] = {
85  { "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 },
86  { NULL },
87 };
88 
89 static const AVClass asf_class = {
90  .class_name = "asf demuxer",
91  .item_name = av_default_item_name,
92  .option = options,
93  .version = LIBAVUTIL_VERSION_INT,
94 };
95 
96 #undef NDEBUG
97 #include <assert.h>
98 
99 #define ASF_MAX_STREAMS 127
100 #define FRAME_HEADER_SIZE 16
101 // Fix Me! FRAME_HEADER_SIZE may be different. (17 is known to be too large)
102 
103 #ifdef DEBUG
104 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
105  0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
106 };
107 
108 #define PRINT_IF_GUID(g, cmp) \
109  if (!ff_guidcmp(g, &cmp)) \
110  av_dlog(NULL, "(GUID: %s) ", # cmp)
111 
112 static void print_guid(ff_asf_guid *g)
113 {
114  int i;
115  PRINT_IF_GUID(g, ff_asf_header);
116  else PRINT_IF_GUID(g, ff_asf_file_header);
117  else PRINT_IF_GUID(g, ff_asf_stream_header);
118  else PRINT_IF_GUID(g, ff_asf_audio_stream);
119  else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
120  else PRINT_IF_GUID(g, ff_asf_video_stream);
121  else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
122  else PRINT_IF_GUID(g, ff_asf_command_stream);
123  else PRINT_IF_GUID(g, ff_asf_comment_header);
124  else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
125  else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
126  else PRINT_IF_GUID(g, ff_asf_data_header);
127  else PRINT_IF_GUID(g, ff_asf_simple_index_header);
128  else PRINT_IF_GUID(g, ff_asf_head1_guid);
129  else PRINT_IF_GUID(g, ff_asf_head2_guid);
130  else PRINT_IF_GUID(g, ff_asf_my_guid);
131  else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
132  else PRINT_IF_GUID(g, ff_asf_extended_content_header);
133  else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
134  else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
135  else PRINT_IF_GUID(g, ff_asf_metadata_header);
136  else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
137  else PRINT_IF_GUID(g, ff_asf_marker_header);
138  else PRINT_IF_GUID(g, stream_bitrate_guid);
139  else PRINT_IF_GUID(g, ff_asf_language_guid);
140  else
141  av_dlog(NULL, "(GUID: unknown) ");
142  for (i = 0; i < 16; i++)
143  av_dlog(NULL, " 0x%02x,", (*g)[i]);
144  av_dlog(NULL, "}\n");
145 }
146 #undef PRINT_IF_GUID
147 #else
148 #define print_guid(g)
149 #endif
150 
151 static int asf_probe(AVProbeData *pd)
152 {
153  /* check file header */
154  if (!ff_guidcmp(pd->buf, &ff_asf_header))
155  return AVPROBE_SCORE_MAX;
156  else
157  return 0;
158 }
159 
160 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
161  * but 16 bit for "Metadata Object" and "Metadata Library Object" */
162 static int get_value(AVIOContext *pb, int type, int type2_size)
163 {
164  switch (type) {
165  case 2:
166  return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
167  case 3:
168  return avio_rl32(pb);
169  case 4:
170  return avio_rl64(pb);
171  case 5:
172  return avio_rl16(pb);
173  default:
174  return INT_MIN;
175  }
176 }
177 
178 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
179  * but in reality this is only loosely similar */
181 {
182  AVPacket pkt = { 0 };
183  const CodecMime *mime = ff_id3v2_mime_tags;
184  enum AVCodecID id = AV_CODEC_ID_NONE;
185  char mimetype[64];
186  uint8_t *desc = NULL;
187  AVStream *st = NULL;
188  int ret, type, picsize, desc_len;
189 
190  /* type + picsize + mime + desc */
191  if (len < 1 + 4 + 2 + 2) {
192  av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
193  return AVERROR_INVALIDDATA;
194  }
195 
196  /* picture type */
197  type = avio_r8(s->pb);
198  len--;
199  if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
200  av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
201  type = 0;
202  }
203 
204  /* picture data size */
205  picsize = avio_rl32(s->pb);
206  len -= 4;
207 
208  /* picture MIME type */
209  len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
210  while (mime->id != AV_CODEC_ID_NONE) {
211  if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
212  id = mime->id;
213  break;
214  }
215  mime++;
216  }
217  if (id == AV_CODEC_ID_NONE) {
218  av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
219  mimetype);
220  return 0;
221  }
222 
223  if (picsize >= len) {
224  av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
225  picsize, len);
226  return AVERROR_INVALIDDATA;
227  }
228 
229  /* picture description */
230  desc_len = (len - picsize) * 2 + 1;
231  desc = av_malloc(desc_len);
232  if (!desc)
233  return AVERROR(ENOMEM);
234  len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
235 
236  ret = av_get_packet(s->pb, &pkt, picsize);
237  if (ret < 0)
238  goto fail;
239 
240  st = avformat_new_stream(s, NULL);
241  if (!st) {
242  ret = AVERROR(ENOMEM);
243  goto fail;
244  }
247  st->codec->codec_id = id;
248  st->attached_pic = pkt;
249  st->attached_pic.stream_index = st->index;
251 
252  if (*desc)
253  av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
254  else
255  av_freep(&desc);
256 
257  av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
258 
259  return 0;
260 
261 fail:
262  av_freep(&desc);
263  av_free_packet(&pkt);
264  return ret;
265 }
266 
267 static void get_id3_tag(AVFormatContext *s, int len)
268 {
269  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
270 
271  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
272  if (id3v2_extra_meta)
273  ff_id3v2_parse_apic(s, &id3v2_extra_meta);
274  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
275 }
276 
277 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
278 {
279  char *value;
280  int64_t off = avio_tell(s->pb);
281 #define LEN 22
282 
283  if ((unsigned)len >= (UINT_MAX - LEN) / 2)
284  return;
285 
286  value = av_malloc(2 * len + LEN);
287  if (!value)
288  goto finish;
289 
290  if (type == 0) { // UTF16-LE
291  avio_get_str16le(s->pb, len, value, 2 * len + 1);
292  } else if (type == -1) { // ASCII
293  avio_read(s->pb, value, len);
294  value[len]=0;
295  } else if (type == 1) { // byte array
296  if (!strcmp(key, "WM/Picture")) { // handle cover art
297  asf_read_picture(s, len);
298  } else if (!strcmp(key, "ID3")) { // handle ID3 tag
299  get_id3_tag(s, len);
300  } else {
301  av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
302  }
303  goto finish;
304  } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
305  uint64_t num = get_value(s->pb, type, type2_size);
306  snprintf(value, LEN, "%"PRIu64, num);
307  } else if (type == 6) { // (don't) handle GUID
308  av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
309  goto finish;
310  } else {
311  av_log(s, AV_LOG_DEBUG,
312  "Unsupported value type %d in tag %s.\n", type, key);
313  goto finish;
314  }
315  if (*value)
316  av_dict_set(&s->metadata, key, value, 0);
317 
318 finish:
319  av_freep(&value);
320  avio_seek(s->pb, off + len, SEEK_SET);
321 }
322 
324 {
325  ASFContext *asf = s->priv_data;
326  AVIOContext *pb = s->pb;
327 
328  ff_get_guid(pb, &asf->hdr.guid);
329  asf->hdr.file_size = avio_rl64(pb);
330  asf->hdr.create_time = avio_rl64(pb);
331  avio_rl64(pb); /* number of packets */
332  asf->hdr.play_time = avio_rl64(pb);
333  asf->hdr.send_time = avio_rl64(pb);
334  asf->hdr.preroll = avio_rl32(pb);
335  asf->hdr.ignore = avio_rl32(pb);
336  asf->hdr.flags = avio_rl32(pb);
337  asf->hdr.min_pktsize = avio_rl32(pb);
338  asf->hdr.max_pktsize = avio_rl32(pb);
339  if (asf->hdr.min_pktsize >= (1U << 29))
340  return AVERROR_INVALIDDATA;
341  asf->hdr.max_bitrate = avio_rl32(pb);
342  s->packet_size = asf->hdr.max_pktsize;
343 
344  return 0;
345 }
346 
348 {
349  ASFContext *asf = s->priv_data;
350  AVIOContext *pb = s->pb;
351  AVStream *st;
352  ASFStream *asf_st;
353  ff_asf_guid g;
354  enum AVMediaType type;
355  int type_specific_size, sizeX;
356  unsigned int tag1;
357  int64_t pos1, pos2, start_time;
358  int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
359 
360  if (s->nb_streams == ASF_MAX_STREAMS) {
361  av_log(s, AV_LOG_ERROR, "too many streams\n");
362  return AVERROR(EINVAL);
363  }
364 
365  pos1 = avio_tell(pb);
366 
367  st = avformat_new_stream(s, NULL);
368  if (!st)
369  return AVERROR(ENOMEM);
370  avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
371  asf_st = av_mallocz(sizeof(ASFStream));
372  if (!asf_st)
373  return AVERROR(ENOMEM);
374  st->priv_data = asf_st;
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  int64_t fsize = avio_size(pb);
381  if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
382  FFABS(fsize - (int64_t)asf->hdr.file_size) / (float)FFMIN(fsize, asf->hdr.file_size) < 0.05)
383  st->duration = asf->hdr.play_time /
384  (10000000 / 1000) - start_time;
385  }
386  ff_get_guid(pb, &g);
387 
388  test_for_ext_stream_audio = 0;
389  if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
390  type = AVMEDIA_TYPE_AUDIO;
391  } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
392  type = AVMEDIA_TYPE_VIDEO;
393  } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
394  type = AVMEDIA_TYPE_VIDEO;
396  } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
397  type = AVMEDIA_TYPE_DATA;
399  test_for_ext_stream_audio = 1;
400  type = AVMEDIA_TYPE_UNKNOWN;
401  } else {
402  return -1;
403  }
404  ff_get_guid(pb, &g);
405  avio_skip(pb, 8); /* total_size */
406  type_specific_size = avio_rl32(pb);
407  avio_rl32(pb);
408  st->id = avio_rl16(pb) & 0x7f; /* stream id */
409  // mapping of asf ID to AV stream ID;
410  asf->asfid2avid[st->id] = s->nb_streams - 1;
411 
412  avio_rl32(pb);
413 
414  if (test_for_ext_stream_audio) {
415  ff_get_guid(pb, &g);
417  type = AVMEDIA_TYPE_AUDIO;
418  is_dvr_ms_audio = 1;
419  ff_get_guid(pb, &g);
420  avio_rl32(pb);
421  avio_rl32(pb);
422  avio_rl32(pb);
423  ff_get_guid(pb, &g);
424  avio_rl32(pb);
425  }
426  }
427 
428  st->codec->codec_type = type;
429  if (type == AVMEDIA_TYPE_AUDIO) {
430  int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
431  if (ret < 0)
432  return ret;
433  if (is_dvr_ms_audio) {
434  // codec_id and codec_tag are unreliable in dvr_ms
435  // files. Set them later by probing stream.
436  st->request_probe = 1;
437  st->codec->codec_tag = 0;
438  }
439  if (st->codec->codec_id == AV_CODEC_ID_AAC)
441  else
443  /* We have to init the frame size at some point .... */
444  pos2 = avio_tell(pb);
445  if (size >= (pos2 + 8 - pos1 + 24)) {
446  asf_st->ds_span = avio_r8(pb);
447  asf_st->ds_packet_size = avio_rl16(pb);
448  asf_st->ds_chunk_size = avio_rl16(pb);
449  avio_rl16(pb); // ds_data_size
450  avio_r8(pb); // ds_silence_data
451  }
452  if (asf_st->ds_span > 1) {
453  if (!asf_st->ds_chunk_size ||
454  (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
455  asf_st->ds_packet_size % asf_st->ds_chunk_size)
456  asf_st->ds_span = 0; // disable descrambling
457  }
458  } else if (type == AVMEDIA_TYPE_VIDEO &&
459  size - (avio_tell(pb) - pos1 + 24) >= 51) {
460  avio_rl32(pb);
461  avio_rl32(pb);
462  avio_r8(pb);
463  avio_rl16(pb); /* size */
464  sizeX = avio_rl32(pb); /* size */
465  st->codec->width = avio_rl32(pb);
466  st->codec->height = avio_rl32(pb);
467  /* not available for asf */
468  avio_rl16(pb); /* panes */
469  st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
470  tag1 = avio_rl32(pb);
471  avio_skip(pb, 20);
472  if (sizeX > 40) {
473  st->codec->extradata_size = ffio_limit(pb, sizeX - 40);
476  avio_read(pb, st->codec->extradata, st->codec->extradata_size);
477  }
478 
479  /* Extract palette from extradata if bpp <= 8 */
480  /* This code assumes that extradata contains only palette */
481  /* This is true for all paletted codecs implemented in libavcodec */
482  if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
483 #if HAVE_BIGENDIAN
484  int i;
485  for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
486  asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
487 #else
488  memcpy(asf_st->palette, st->codec->extradata,
490 #endif
491  asf_st->palette_changed = 1;
492  }
493 
494  st->codec->codec_tag = tag1;
496  if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
498  /* issue658 contains wrong w/h and MS even puts a fake seq header
499  * with wrong w/h in extradata while a correct one is in the stream.
500  * maximum lameness */
501  st->codec->width =
502  st->codec->height = 0;
503  av_freep(&st->codec->extradata);
504  st->codec->extradata_size = 0;
505  }
506  if (st->codec->codec_id == AV_CODEC_ID_H264)
508  }
509  pos2 = avio_tell(pb);
510  avio_skip(pb, size - (pos2 - pos1 + 24));
511 
512  return 0;
513 }
514 
516 {
517  ASFContext *asf = s->priv_data;
518  AVIOContext *pb = s->pb;
519  ff_asf_guid g;
520  int ext_len, payload_ext_ct, stream_ct, i;
521  uint32_t leak_rate, stream_num;
522  unsigned int stream_languageid_index;
523 
524  avio_rl64(pb); // starttime
525  avio_rl64(pb); // endtime
526  leak_rate = avio_rl32(pb); // leak-datarate
527  avio_rl32(pb); // bucket-datasize
528  avio_rl32(pb); // init-bucket-fullness
529  avio_rl32(pb); // alt-leak-datarate
530  avio_rl32(pb); // alt-bucket-datasize
531  avio_rl32(pb); // alt-init-bucket-fullness
532  avio_rl32(pb); // max-object-size
533  avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
534  stream_num = avio_rl16(pb); // stream-num
535 
536  stream_languageid_index = avio_rl16(pb); // stream-language-id-index
537  if (stream_num < 128)
538  asf->streams[stream_num].stream_language_index = stream_languageid_index;
539 
540  avio_rl64(pb); // avg frametime in 100ns units
541  stream_ct = avio_rl16(pb); // stream-name-count
542  payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
543 
544  if (stream_num < 128) {
545  asf->stream_bitrates[stream_num] = leak_rate;
546  asf->streams[stream_num].payload_ext_ct = 0;
547  }
548 
549  for (i = 0; i < stream_ct; i++) {
550  avio_rl16(pb);
551  ext_len = avio_rl16(pb);
552  avio_skip(pb, ext_len);
553  }
554 
555  for (i = 0; i < payload_ext_ct; i++) {
556  int size;
557  ff_get_guid(pb, &g);
558  size = avio_rl16(pb);
559  ext_len = avio_rl32(pb);
560  avio_skip(pb, ext_len);
561  if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
562  ASFPayload *p = &asf->streams[stream_num].payload[i];
563  p->type = g[0];
564  p->size = size;
565  av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
566  asf->streams[stream_num].payload_ext_ct ++;
567  }
568  }
569 
570  return 0;
571 }
572 
574 {
575  AVIOContext *pb = s->pb;
576  int len1, len2, len3, len4, len5;
577 
578  len1 = avio_rl16(pb);
579  len2 = avio_rl16(pb);
580  len3 = avio_rl16(pb);
581  len4 = avio_rl16(pb);
582  len5 = avio_rl16(pb);
583  get_tag(s, "title", 0, len1, 32);
584  get_tag(s, "author", 0, len2, 32);
585  get_tag(s, "copyright", 0, len3, 32);
586  get_tag(s, "comment", 0, len4, 32);
587  avio_skip(pb, len5);
588 
589  return 0;
590 }
591 
593 {
594  AVIOContext *pb = s->pb;
595  ASFContext *asf = s->priv_data;
596  int desc_count, i, ret;
597 
598  desc_count = avio_rl16(pb);
599  for (i = 0; i < desc_count; i++) {
600  int name_len, value_type, value_len;
601  char name[1024];
602 
603  name_len = avio_rl16(pb);
604  if (name_len % 2) // must be even, broken lavf versions wrote len-1
605  name_len += 1;
606  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
607  avio_skip(pb, name_len - ret);
608  value_type = avio_rl16(pb);
609  value_len = avio_rl16(pb);
610  if (!value_type && value_len % 2)
611  value_len += 1;
612  /* My sample has that stream set to 0 maybe that mean the container.
613  * ASF stream count starts at 1. I am using 0 to the container value
614  * since it's unused. */
615  if (!strcmp(name, "AspectRatioX"))
616  asf->dar[0].num = get_value(s->pb, value_type, 32);
617  else if (!strcmp(name, "AspectRatioY"))
618  asf->dar[0].den = get_value(s->pb, value_type, 32);
619  else
620  get_tag(s, name, value_type, value_len, 32);
621  }
622 
623  return 0;
624 }
625 
627 {
628  AVIOContext *pb = s->pb;
629  ASFContext *asf = s->priv_data;
630  int j, ret;
631  int stream_count = avio_rl16(pb);
632  for (j = 0; j < stream_count; j++) {
633  char lang[6];
634  unsigned int lang_len = avio_r8(pb);
635  if ((ret = avio_get_str16le(pb, lang_len, lang,
636  sizeof(lang))) < lang_len)
637  avio_skip(pb, lang_len - ret);
638  if (j < 128)
639  av_strlcpy(asf->stream_languages[j], lang,
640  sizeof(*asf->stream_languages));
641  }
642 
643  return 0;
644 }
645 
646 static int asf_read_metadata(AVFormatContext *s, int64_t size)
647 {
648  AVIOContext *pb = s->pb;
649  ASFContext *asf = s->priv_data;
650  int n, stream_num, name_len, value_len;
651  int ret, i;
652  n = avio_rl16(pb);
653 
654  for (i = 0; i < n; i++) {
655  char name[1024];
656  int value_type;
657 
658  avio_rl16(pb); // lang_list_index
659  stream_num = avio_rl16(pb);
660  name_len = avio_rl16(pb);
661  value_type = avio_rl16(pb); /* value_type */
662  value_len = avio_rl32(pb);
663 
664  if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
665  avio_skip(pb, name_len - ret);
666  av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
667  i, stream_num, name_len, value_type, value_len, name);
668 
669  if (!strcmp(name, "AspectRatioX")){
670  int aspect_x = get_value(s->pb, value_type, 16);
671  if(stream_num < 128)
672  asf->dar[stream_num].num = aspect_x;
673  } else if(!strcmp(name, "AspectRatioY")){
674  int aspect_y = get_value(s->pb, value_type, 16);
675  if(stream_num < 128)
676  asf->dar[stream_num].den = aspect_y;
677  } else {
678  get_tag(s, name, value_type, value_len, 16);
679  }
680  }
681 
682  return 0;
683 }
684 
685 static int asf_read_marker(AVFormatContext *s, int64_t size)
686 {
687  AVIOContext *pb = s->pb;
688  int i, count, name_len, ret;
689  char name[1024];
690 
691  avio_rl64(pb); // reserved 16 bytes
692  avio_rl64(pb); // ...
693  count = avio_rl32(pb); // markers count
694  avio_rl16(pb); // reserved 2 bytes
695  name_len = avio_rl16(pb); // name length
696  for (i = 0; i < name_len; i++)
697  avio_r8(pb); // skip the name
698 
699  for (i = 0; i < count; i++) {
700  int64_t pres_time;
701  int name_len;
702 
703  avio_rl64(pb); // offset, 8 bytes
704  pres_time = avio_rl64(pb); // presentation time
705  avio_rl16(pb); // entry length
706  avio_rl32(pb); // send time
707  avio_rl32(pb); // flags
708  name_len = avio_rl32(pb); // name length
709  if ((ret = avio_get_str16le(pb, name_len * 2, name,
710  sizeof(name))) < name_len)
711  avio_skip(pb, name_len - ret);
712  avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
714  }
715 
716  return 0;
717 }
718 
720 {
721  ASFContext *asf = s->priv_data;
722  ff_asf_guid g;
723  AVIOContext *pb = s->pb;
724  int i;
725  int64_t gsize;
726 
727  ff_get_guid(pb, &g);
728  if (ff_guidcmp(&g, &ff_asf_header))
729  return AVERROR_INVALIDDATA;
730  avio_rl64(pb);
731  avio_rl32(pb);
732  avio_r8(pb);
733  avio_r8(pb);
734  memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
735  for (;;) {
736  uint64_t gpos = avio_tell(pb);
737  ff_get_guid(pb, &g);
738  gsize = avio_rl64(pb);
739  print_guid(&g);
740  if (!ff_guidcmp(&g, &ff_asf_data_header)) {
741  asf->data_object_offset = avio_tell(pb);
742  /* If not streaming, gsize is not unlimited (how?),
743  * and there is enough space in the file.. */
744  if (!(asf->hdr.flags & 0x01) && gsize >= 100)
745  asf->data_object_size = gsize - 24;
746  else
747  asf->data_object_size = (uint64_t)-1;
748  break;
749  }
750  if (gsize < 24)
751  return AVERROR_INVALIDDATA;
752  if (!ff_guidcmp(&g, &ff_asf_file_header)) {
753  int ret = asf_read_file_properties(s, gsize);
754  if (ret < 0)
755  return ret;
756  } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
757  asf_read_stream_properties(s, gsize);
758  } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
759  asf_read_content_desc(s, gsize);
760  } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
761  asf_read_language_list(s, gsize);
762  } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
763  asf_read_ext_content_desc(s, gsize);
764  } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
765  asf_read_metadata(s, gsize);
766  } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
767  asf_read_metadata(s, gsize);
768  } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
770 
771  // there could be a optional stream properties object to follow
772  // if so the next iteration will pick it up
773  continue;
774  } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
775  ff_get_guid(pb, &g);
776  avio_skip(pb, 6);
777  continue;
778  } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
779  asf_read_marker(s, gsize);
780  } else if (url_feof(pb)) {
781  return AVERROR_EOF;
782  } else {
783  if (!s->keylen) {
785  unsigned int len;
786  AVPacket pkt;
788  "DRM protected stream detected, decoding will likely fail!\n");
789  len= avio_rl32(pb);
790  av_log(s, AV_LOG_DEBUG, "Secret data:\n");
791  av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
792  len= avio_rl32(pb);
793  get_tag(s, "ASF_Protection_Type", -1, len, 32);
794  len= avio_rl32(pb);
795  get_tag(s, "ASF_Key_ID", -1, len, 32);
796  len= avio_rl32(pb);
797  get_tag(s, "ASF_License_URL", -1, len, 32);
798  } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
800  "Ext DRM protected stream detected, decoding will likely fail!\n");
801  av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
802  } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
803  av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
804  }
805  }
806  }
807  if (avio_tell(pb) != gpos + gsize)
808  av_log(s, AV_LOG_DEBUG,
809  "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
810  avio_tell(pb) - gpos, gsize);
811  avio_seek(pb, gpos + gsize, SEEK_SET);
812  }
813  ff_get_guid(pb, &g);
814  avio_rl64(pb);
815  avio_r8(pb);
816  avio_r8(pb);
817  if (url_feof(pb))
818  return AVERROR_EOF;
819  asf->data_offset = avio_tell(pb);
820  asf->packet_size_left = 0;
821 
822  for (i = 0; i < 128; i++) {
823  int stream_num = asf->asfid2avid[i];
824  if (stream_num >= 0) {
825  AVStream *st = s->streams[stream_num];
826  if (!st->codec->bit_rate)
827  st->codec->bit_rate = asf->stream_bitrates[i];
828  if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
831  asf->dar[i].num, asf->dar[i].den, INT_MAX);
832  } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
833  // Use ASF container value if the stream doesn't set AR.
837  asf->dar[0].num, asf->dar[0].den, INT_MAX);
838 
839  av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
840  i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
842 
843  // copy and convert language codes to the frontend
844  if (asf->streams[i].stream_language_index < 128) {
845  const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
846  if (rfc1766 && strlen(rfc1766) > 1) {
847  const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
848  const char *iso6392 = av_convert_lang_to(primary_tag,
850  if (iso6392)
851  av_dict_set(&st->metadata, "language", iso6392, 0);
852  }
853  }
854  }
855  }
856 
858 
859  return 0;
860 }
861 
862 #define DO_2BITS(bits, var, defval) \
863  switch (bits & 3) { \
864  case 3: \
865  var = avio_rl32(pb); \
866  rsize += 4; \
867  break; \
868  case 2: \
869  var = avio_rl16(pb); \
870  rsize += 2; \
871  break; \
872  case 1: \
873  var = avio_r8(pb); \
874  rsize++; \
875  break; \
876  default: \
877  var = defval; \
878  break; \
879  }
880 
888 {
889  ASFContext *asf = s->priv_data;
890  uint32_t packet_length, padsize;
891  int rsize = 8;
892  int c, d, e, off;
893 
894  // if we do not know packet size, allow skipping up to 32 kB
895  off = 32768;
896  if (asf->no_resync_search)
897  off = 3;
898  else if (s->packet_size > 0)
899  off = (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
900 
901  c = d = e = -1;
902  while (off-- > 0) {
903  c = d;
904  d = e;
905  e = avio_r8(pb);
906  if (c == 0x82 && !d && !e)
907  break;
908  }
909 
910  if (c != 0x82) {
911  /* This code allows handling of -EAGAIN at packet boundaries (i.e.
912  * if the packet sync code above triggers -EAGAIN). This does not
913  * imply complete -EAGAIN handling support at random positions in
914  * the stream. */
915  if (pb->error == AVERROR(EAGAIN))
916  return AVERROR(EAGAIN);
917  if (!url_feof(pb))
918  av_log(s, AV_LOG_ERROR,
919  "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
920  }
921  if ((c & 0x8f) == 0x82) {
922  if (d || e) {
923  if (!url_feof(pb))
924  av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
925  return AVERROR_INVALIDDATA;
926  }
927  c = avio_r8(pb);
928  d = avio_r8(pb);
929  rsize += 3;
930  } else if(!url_feof(pb)) {
931  avio_seek(pb, -1, SEEK_CUR); // FIXME
932  }
933 
934  asf->packet_flags = c;
935  asf->packet_property = d;
936 
937  DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
938  DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
939  DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
940 
941  // the following checks prevent overflows and infinite loops
942  if (!packet_length || packet_length >= (1U << 29)) {
943  av_log(s, AV_LOG_ERROR,
944  "invalid packet_length %d at:%"PRId64"\n",
945  packet_length, avio_tell(pb));
946  return AVERROR_INVALIDDATA;
947  }
948  if (padsize >= packet_length) {
949  av_log(s, AV_LOG_ERROR,
950  "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
951  return AVERROR_INVALIDDATA;
952  }
953 
954  asf->packet_timestamp = avio_rl32(pb);
955  avio_rl16(pb); /* duration */
956  // rsize has at least 11 bytes which have to be present
957 
958  if (asf->packet_flags & 0x01) {
959  asf->packet_segsizetype = avio_r8(pb);
960  rsize++;
961  asf->packet_segments = asf->packet_segsizetype & 0x3f;
962  } else {
963  asf->packet_segments = 1;
964  asf->packet_segsizetype = 0x80;
965  }
966  if (rsize > packet_length - padsize) {
967  asf->packet_size_left = 0;
968  av_log(s, AV_LOG_ERROR,
969  "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
970  rsize, packet_length, padsize, avio_tell(pb));
971  return AVERROR_INVALIDDATA;
972  }
973  asf->packet_size_left = packet_length - padsize - rsize;
974  if (packet_length < asf->hdr.min_pktsize)
975  padsize += asf->hdr.min_pktsize - packet_length;
976  asf->packet_padsize = padsize;
977  av_dlog(s, "packet: size=%d padsize=%d left=%d\n",
979  return 0;
980 }
981 
987 {
988  ASFContext *asf = s->priv_data;
989  ASFStream *asfst;
990  int rsize = 1;
991  int num = avio_r8(pb);
992  int i;
993  int64_t ts0, ts1 av_unused;
994 
995  asf->packet_segments--;
996  asf->packet_key_frame = num >> 7;
997  asf->stream_index = asf->asfid2avid[num & 0x7f];
998  asfst = &asf->streams[num & 0x7f];
999  // sequence should be ignored!
1000  DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
1001  DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
1003  av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
1004  asf->packet_key_frame, asf->stream_index, asf->packet_seq,
1006  if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {
1007  av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
1008  return AVERROR_INVALIDDATA;
1009  }
1010  if (asf->packet_replic_size >= 8) {
1011  int64_t end = avio_tell(pb) + asf->packet_replic_size;
1012  AVRational aspect;
1013  asf->packet_obj_size = avio_rl32(pb);
1014  if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) {
1015  av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
1016  asf->packet_obj_size = 0;
1017  return AVERROR_INVALIDDATA;
1018  }
1019  asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
1020 
1021  for (i = 0; i < asfst->payload_ext_ct; i++) {
1022  ASFPayload *p = &asfst->payload[i];
1023  int size = p->size;
1024  int64_t payend;
1025  if (size == 0xFFFF)
1026  size = avio_rl16(pb);
1027  payend = avio_tell(pb) + size;
1028  if (payend > end) {
1029  av_log(s, AV_LOG_ERROR, "too long payload\n");
1030  break;
1031  }
1032  switch (p->type) {
1033  case 0x50:
1034 // duration = avio_rl16(pb);
1035  break;
1036  case 0x54:
1037  aspect.num = avio_r8(pb);
1038  aspect.den = avio_r8(pb);
1039  if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
1040  s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
1041  }
1042  break;
1043  case 0x2A:
1044  avio_skip(pb, 8);
1045  ts0 = avio_rl64(pb);
1046  ts1 = avio_rl64(pb);
1047  if (ts0!= -1) asf->packet_frag_timestamp = ts0/10000;
1049  break;
1050  case 0x5B:
1051  case 0xB7:
1052  case 0xCC:
1053  case 0xC0:
1054  case 0xA0:
1055  //unknown
1056  break;
1057  }
1058  avio_seek(pb, payend, SEEK_SET);
1059  }
1060 
1061  avio_seek(pb, end, SEEK_SET);
1062  rsize += asf->packet_replic_size; // FIXME - check validity
1063  } else if (asf->packet_replic_size == 1) {
1064  // multipacket - frag_offset is beginning timestamp
1066  asf->packet_frag_offset = 0;
1068 
1069  asf->packet_time_delta = avio_r8(pb);
1070  rsize++;
1071  } else if (asf->packet_replic_size != 0) {
1072  av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1073  asf->packet_replic_size);
1074  return AVERROR_INVALIDDATA;
1075  }
1076  if (asf->packet_flags & 0x01) {
1077  DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1078  if (rsize > asf->packet_size_left) {
1079  av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1080  return AVERROR_INVALIDDATA;
1081  } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1082  if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1083  av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
1084  asf->packet_size_left, rsize);
1085  return AVERROR_INVALIDDATA;
1086  } else {
1087  int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1088  asf->packet_size_left += diff;
1089  asf->packet_padsize -= diff;
1090  }
1091  }
1092  } else {
1093  asf->packet_frag_size = asf->packet_size_left - rsize;
1094  }
1095  if (asf->packet_replic_size == 1) {
1096  asf->packet_multi_size = asf->packet_frag_size;
1097  if (asf->packet_multi_size > asf->packet_size_left)
1098  return AVERROR_INVALIDDATA;
1099  }
1100  asf->packet_size_left -= rsize;
1101 
1102  return 0;
1103 }
1104 
1115 {
1116  ASFContext *asf = s->priv_data;
1117  ASFStream *asf_st = 0;
1118  for (;;) {
1119  int ret;
1120  if (url_feof(pb))
1121  return AVERROR_EOF;
1122 
1123  if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1124  asf->packet_segments < 1) {
1125  int ret = asf->packet_size_left + asf->packet_padsize;
1126 
1127  assert(ret >= 0);
1128  /* fail safe */
1129  avio_skip(pb, ret);
1130 
1131  asf->packet_pos = avio_tell(pb);
1132  if (asf->data_object_size != (uint64_t)-1 &&
1133  (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1134  return AVERROR_EOF; /* Do not exceed the size of the data object */
1135  return 1;
1136  }
1137  if (asf->packet_time_start == 0) {
1138  if (asf_read_frame_header(s, pb) < 0) {
1139  asf->packet_segments = 0;
1140  continue;
1141  }
1142  if (asf->stream_index < 0 ||
1143  s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1144  (!asf->packet_key_frame &&
1145  s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
1146  asf->packet_time_start = 0;
1147  /* unhandled packet (should not happen) */
1148  avio_skip(pb, asf->packet_frag_size);
1149  asf->packet_size_left -= asf->packet_frag_size;
1150  if (asf->stream_index < 0)
1151  av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1152  asf->packet_frag_size);
1153  continue;
1154  }
1155  asf->asf_st = s->streams[asf->stream_index]->priv_data;
1156  }
1157  asf_st = asf->asf_st;
1158  av_assert0(asf_st);
1159 
1160  if (asf->packet_replic_size == 1) {
1161  // frag_offset is here used as the beginning timestamp
1163  asf->packet_time_start += asf->packet_time_delta;
1164  asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1165  asf->packet_size_left--;
1166  asf->packet_multi_size--;
1167  if (asf->packet_multi_size < asf->packet_obj_size) {
1168  asf->packet_time_start = 0;
1169  avio_skip(pb, asf->packet_multi_size);
1170  asf->packet_size_left -= asf->packet_multi_size;
1171  continue;
1172  }
1173  asf->packet_multi_size -= asf->packet_obj_size;
1174  }
1175  if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
1176  asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
1177  av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
1178  asf_st->frag_offset, asf->packet_frag_size,
1179  asf->packet_obj_size, asf_st->pkt.size);
1180  asf->packet_obj_size = asf_st->pkt.size;
1181  }
1182 
1183  if (asf_st->pkt.size != asf->packet_obj_size ||
1184  // FIXME is this condition sufficient?
1185  asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1186  if (asf_st->pkt.data) {
1187  av_log(s, AV_LOG_INFO,
1188  "freeing incomplete packet size %d, new %d\n",
1189  asf_st->pkt.size, asf->packet_obj_size);
1190  asf_st->frag_offset = 0;
1191  av_free_packet(&asf_st->pkt);
1192  }
1193  /* new packet */
1194  av_new_packet(&asf_st->pkt, asf->packet_obj_size);
1195  asf_st->seq = asf->packet_seq;
1196  asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1197  asf_st->pkt.stream_index = asf->stream_index;
1198  asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1199 
1200  if (asf_st->pkt.data && asf_st->palette_changed) {
1201  uint8_t *pal;
1203  AVPALETTE_SIZE);
1204  if (!pal) {
1205  av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1206  } else {
1207  memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1208  asf_st->palette_changed = 0;
1209  }
1210  }
1211  av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1212  asf->stream_index, asf->packet_key_frame,
1213  asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1215  asf->packet_obj_size);
1217  asf->packet_key_frame = 1;
1218  if (asf->packet_key_frame)
1219  asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1220  }
1221 
1222  /* read data */
1223  av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1224  s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1225  asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1226  asf->packet_size_left -= asf->packet_frag_size;
1227  if (asf->packet_size_left < 0)
1228  continue;
1229 
1230  if (asf->packet_frag_offset >= asf_st->pkt.size ||
1231  asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1232  av_log(s, AV_LOG_ERROR,
1233  "packet fragment position invalid %u,%u not in %u\n",
1235  asf_st->pkt.size);
1236  continue;
1237  }
1238 
1239  ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1240  asf->packet_frag_size);
1241  if (ret != asf->packet_frag_size) {
1242  if (ret < 0 || asf->packet_frag_offset + ret == 0)
1243  return ret < 0 ? ret : AVERROR_EOF;
1244 
1245  if (asf_st->ds_span > 1) {
1246  // scrambling, we can either drop it completely or fill the remainder
1247  // TODO: should we fill the whole packet instead of just the current
1248  // fragment?
1249  memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1250  asf->packet_frag_size - ret);
1251  ret = asf->packet_frag_size;
1252  } else {
1253  // no scrambling, so we can return partial packets
1254  av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1255  }
1256  }
1257  if (s->key && s->keylen == 20)
1258  ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1259  ret);
1260  asf_st->frag_offset += ret;
1261  /* test if whole packet is read */
1262  if (asf_st->frag_offset == asf_st->pkt.size) {
1263  // workaround for macroshit radio DVR-MS files
1265  asf_st->pkt.size > 100) {
1266  int i;
1267  for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1268  ;
1269  if (i == asf_st->pkt.size) {
1270  av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1271  asf_st->frag_offset = 0;
1272  av_free_packet(&asf_st->pkt);
1273  continue;
1274  }
1275  }
1276 
1277  /* return packet */
1278  if (asf_st->ds_span > 1) {
1279  if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1280  av_log(s, AV_LOG_ERROR,
1281  "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1282  asf_st->pkt.size, asf_st->ds_packet_size,
1283  asf_st->ds_span);
1284  } else {
1285  /* packet descrambling */
1286  uint8_t *newdata = av_malloc(asf_st->pkt.size +
1288  if (newdata) {
1289  int offset = 0;
1290  memset(newdata + asf_st->pkt.size, 0,
1292  while (offset < asf_st->pkt.size) {
1293  int off = offset / asf_st->ds_chunk_size;
1294  int row = off / asf_st->ds_span;
1295  int col = off % asf_st->ds_span;
1296  int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1297  assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1298  assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1299  memcpy(newdata + offset,
1300  asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1301  asf_st->ds_chunk_size);
1302  offset += asf_st->ds_chunk_size;
1303  }
1304  av_free(asf_st->pkt.data);
1305  asf_st->pkt.data = newdata;
1306  }
1307  }
1308  }
1309  asf_st->frag_offset = 0;
1310  *pkt = asf_st->pkt;
1311  asf_st->pkt.size = 0;
1312  asf_st->pkt.data = 0;
1313  asf_st->pkt.side_data_elems = 0;
1314  asf_st->pkt.side_data = NULL;
1315  break; // packet completed
1316  }
1317  }
1318  return 0;
1319 }
1320 
1322 {
1323  ASFContext *asf = s->priv_data;
1324 
1325  for (;;) {
1326  int ret;
1327 
1328  /* parse cached packets, if any */
1329  if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1330  return ret;
1331  if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1332  assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1333  asf->packet_segments < 1);
1334  asf->packet_time_start = 0;
1335  }
1336 }
1337 
1338 // Added to support seeking after packets have been read
1339 // If information is not reset, read_packet fails due to
1340 // leftover information from previous reads
1342 {
1343  ASFContext *asf = s->priv_data;
1344  ASFStream *asf_st;
1345  int i;
1346 
1347  asf->packet_size_left = 0;
1348  asf->packet_segments = 0;
1349  asf->packet_flags = 0;
1350  asf->packet_property = 0;
1351  asf->packet_timestamp = 0;
1352  asf->packet_segsizetype = 0;
1353  asf->packet_segments = 0;
1354  asf->packet_seq = 0;
1355  asf->packet_replic_size = 0;
1356  asf->packet_key_frame = 0;
1357  asf->packet_padsize = 0;
1358  asf->packet_frag_offset = 0;
1359  asf->packet_frag_size = 0;
1360  asf->packet_frag_timestamp = 0;
1361  asf->packet_multi_size = 0;
1362  asf->packet_obj_size = 0;
1363  asf->packet_time_delta = 0;
1364  asf->packet_time_start = 0;
1365 
1366  for (i = 0; i < s->nb_streams; i++) {
1367  asf_st = s->streams[i]->priv_data;
1368  if (!asf_st)
1369  continue;
1370  av_free_packet(&asf_st->pkt);
1371  asf_st->frag_offset = 0;
1372  asf_st->seq = 0;
1373  }
1374  asf->asf_st = NULL;
1375 }
1376 
1378 {
1379  asf_reset_header(s);
1380 
1381  return 0;
1382 }
1383 
1384 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1385  int64_t *ppos, int64_t pos_limit)
1386 {
1387  AVPacket pkt1, *pkt = &pkt1;
1388  ASFStream *asf_st;
1389  int64_t pts;
1390  int64_t pos = *ppos;
1391  int i;
1392  int64_t start_pos[ASF_MAX_STREAMS];
1393 
1394  for (i = 0; i < s->nb_streams; i++)
1395  start_pos[i] = pos;
1396 
1397  if (s->packet_size > 0)
1398  pos = (pos + s->packet_size - 1 - s->data_offset) /
1399  s->packet_size * s->packet_size +
1400  s->data_offset;
1401  *ppos = pos;
1402  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1403  return AV_NOPTS_VALUE;
1404 
1405  asf_reset_header(s);
1406  for (;;) {
1407  if (av_read_frame(s, pkt) < 0) {
1408  av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1409  return AV_NOPTS_VALUE;
1410  }
1411 
1412  pts = pkt->dts;
1413 
1414  av_free_packet(pkt);
1415  if (pkt->flags & AV_PKT_FLAG_KEY) {
1416  i = pkt->stream_index;
1417 
1418  asf_st = s->streams[i]->priv_data;
1419  av_assert0(asf_st);
1420 
1421 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1422  pos = asf_st->packet_pos;
1423 
1424  av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1425  pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1426  start_pos[i] = asf_st->packet_pos + 1;
1427 
1428  if (pkt->stream_index == stream_index)
1429  break;
1430  }
1431  }
1432 
1433  *ppos = pos;
1434  return pts;
1435 }
1436 
1437 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1438 {
1439  ff_asf_guid g;
1440  ASFContext *asf = s->priv_data;
1441  int64_t current_pos = avio_tell(s->pb);
1442 
1443  if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {
1444  asf->index_read= -1;
1445  return;
1446  }
1447 
1448  ff_get_guid(s->pb, &g);
1449 
1450  /* the data object can be followed by other top-level objects,
1451  * skip them until the simple index object is reached */
1452  while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
1453  int64_t gsize = avio_rl64(s->pb);
1454  if (gsize < 24 || url_feof(s->pb)) {
1455  avio_seek(s->pb, current_pos, SEEK_SET);
1456  asf->index_read= -1;
1457  return;
1458  }
1459  avio_skip(s->pb, gsize - 24);
1460  ff_get_guid(s->pb, &g);
1461  }
1462 
1463  {
1464  int64_t itime, last_pos = -1;
1465  int pct, ict;
1466  int i;
1467  int64_t av_unused gsize = avio_rl64(s->pb);
1468  ff_get_guid(s->pb, &g);
1469  itime = avio_rl64(s->pb);
1470  pct = avio_rl32(s->pb);
1471  ict = avio_rl32(s->pb);
1472  av_log(s, AV_LOG_DEBUG,
1473  "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1474 
1475  for (i = 0; i < ict; i++) {
1476  int pktnum = avio_rl32(s->pb);
1477  int pktct = avio_rl16(s->pb);
1478  int64_t pos = s->data_offset + s->packet_size * (int64_t)pktnum;
1479  int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1480 
1481  if (pos != last_pos) {
1482  av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1483  pktnum, pktct, index_pts);
1484  av_add_index_entry(s->streams[stream_index], pos, index_pts,
1485  s->packet_size, 0, AVINDEX_KEYFRAME);
1486  last_pos = pos;
1487  }
1488  }
1489  asf->index_read = ict > 1;
1490  }
1491  avio_seek(s->pb, current_pos, SEEK_SET);
1492 }
1493 
1494 static int asf_read_seek(AVFormatContext *s, int stream_index,
1495  int64_t pts, int flags)
1496 {
1497  ASFContext *asf = s->priv_data;
1498  AVStream *st = s->streams[stream_index];
1499 
1500  if (s->packet_size <= 0)
1501  return -1;
1502 
1503  /* Try using the protocol's read_seek if available */
1504  if (s->pb) {
1505  int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1506  if (ret >= 0)
1507  asf_reset_header(s);
1508  if (ret != AVERROR(ENOSYS))
1509  return ret;
1510  }
1511 
1512  if (!asf->index_read)
1513  asf_build_simple_index(s, stream_index);
1514 
1515  if ((asf->index_read > 0 && st->index_entries)) {
1516  int index = av_index_search_timestamp(st, pts, flags);
1517  if (index >= 0) {
1518  /* find the position */
1519  uint64_t pos = st->index_entries[index].pos;
1520 
1521  /* do the seek */
1522  av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1523  if(avio_seek(s->pb, pos, SEEK_SET) < 0)
1524  return -1;
1525  asf_reset_header(s);
1526  return 0;
1527  }
1528  }
1529  /* no index or seeking by index failed */
1530  if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1531  return -1;
1532  asf_reset_header(s);
1533  return 0;
1534 }
1535 
1537  .name = "asf",
1538  .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1539  .priv_data_size = sizeof(ASFContext),
1540  .read_probe = asf_probe,
1545  .read_timestamp = asf_read_pts,
1547  .priv_class = &asf_class,
1548 };