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 #include <inttypes.h>
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/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
33 #include "avformat.h"
34 #include "avio_internal.h"
35 #include "avlanguage.h"
36 #include "id3v2.h"
37 #include "internal.h"
38 #include "riff.h"
39 #include "asf.h"
40 #include "asfcrypt.h"
41
42 typedef struct ASFPayload {
43 uint8_t type;
44 uint16_t size;
45 } ASFPayload;
46
47 typedef struct ASFStream {
48 int num;
49 unsigned char seq;
50 /* use for reading */
51 AVPacket pkt;
52 int frag_offset;
53 int packet_obj_size;
54 int timestamp;
55 int64_t duration;
56 int skip_to_key;
57 int pkt_clean;
58
59 int ds_span; /* descrambling */
60 int ds_packet_size;
61 int ds_chunk_size;
62
63 int64_t packet_pos;
64
65 uint16_t stream_language_index;
66
67 int palette_changed;
68 uint32_t palette[256];
69
70 int payload_ext_ct;
71 ASFPayload payload[8];
72 } ASFStream;
73
74 typedef struct ASFContext {
75 const AVClass *class;
76 int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
77 ASFStream streams[128]; ///< it's max number and it's not that big
78 uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
79 AVRational dar[128];
80 char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US)
81 /* non streamed additonnal info */
82 /* packet filling */
83 int packet_size_left;
84 /* only for reading */
85 uint64_t data_offset; ///< beginning of the first data packet
86 uint64_t data_object_offset; ///< data object offset (excl. GUID & size)
87 uint64_t data_object_size; ///< size of the data object
88 int index_read;
89
90 ASFMainHeader hdr;
91
92 int packet_flags;
93 int packet_property;
94 int packet_timestamp;
95 int packet_segsizetype;
96 int packet_segments;
97 int packet_seq;
98 int packet_replic_size;
99 int packet_key_frame;
100 int packet_padsize;
101 unsigned int packet_frag_offset;
102 unsigned int packet_frag_size;
103 int64_t packet_frag_timestamp;
104 int ts_is_pts;
105 int packet_multi_size;
106 int packet_time_delta;
107 int packet_time_start;
108 int64_t packet_pos;
109
110 int stream_index;
111
112 ASFStream *asf_st; ///< currently decoded stream
113
114 int no_resync_search;
115 int export_xmp;
116
117 int uses_std_ecc;
118 } ASFContext;
119
120 static const AVOption options[] = {
121 { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
122 { "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
123 { NULL },
124 };
125
126 static const AVClass asf_class = {
127 .class_name = "asf demuxer",
128 .item_name = av_default_item_name,
129 .option = options,
130 .version = LIBAVUTIL_VERSION_INT,
131 };
132
133 #undef NDEBUG
134 #include <assert.h>
135
136 #define ASF_MAX_STREAMS 127
137 #define FRAME_HEADER_SIZE 6
138 // Fix Me! FRAME_HEADER_SIZE may be different.
139 // (7 is known to be too large for GipsyGuitar.wmv)
140
141 #ifdef DEBUG
142 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
143 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
144 };
145
146 static const ff_asf_guid asf_audio_conceal_none = {
147 // 0x40, 0xa4, 0xf1, 0x49, 0x4ece, 0x11d0, 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6
148 // New value lifted from avifile
149 0x00, 0x57, 0xfb, 0x20, 0x55, 0x5B, 0xCF, 0x11, 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b
150 };
151
152 #define PRINT_IF_GUID(g, cmp) \
153 if (!ff_guidcmp(g, &cmp)) \
154 av_log(NULL, AV_LOG_TRACE, "(GUID: %s) ", # cmp)
155
print_guid(ff_asf_guid * g)156 static void print_guid(ff_asf_guid *g)
157 {
158 int i;
159 PRINT_IF_GUID(g, ff_asf_header);
160 else PRINT_IF_GUID(g, ff_asf_file_header);
161 else PRINT_IF_GUID(g, ff_asf_stream_header);
162 else PRINT_IF_GUID(g, ff_asf_audio_stream);
163 else PRINT_IF_GUID(g, asf_audio_conceal_none);
164 else PRINT_IF_GUID(g, ff_asf_video_stream);
165 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
166 else PRINT_IF_GUID(g, ff_asf_command_stream);
167 else PRINT_IF_GUID(g, ff_asf_comment_header);
168 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
169 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
170 else PRINT_IF_GUID(g, ff_asf_data_header);
171 else PRINT_IF_GUID(g, ff_asf_simple_index_header);
172 else PRINT_IF_GUID(g, ff_asf_head1_guid);
173 else PRINT_IF_GUID(g, ff_asf_head2_guid);
174 else PRINT_IF_GUID(g, ff_asf_my_guid);
175 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
176 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
177 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
178 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
179 else PRINT_IF_GUID(g, ff_asf_metadata_header);
180 else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
181 else PRINT_IF_GUID(g, ff_asf_marker_header);
182 else PRINT_IF_GUID(g, stream_bitrate_guid);
183 else PRINT_IF_GUID(g, ff_asf_language_guid);
184 else
185 av_log(NULL, AV_LOG_TRACE, "(GUID: unknown) ");
186 for (i = 0; i < 16; i++)
187 av_log(NULL, AV_LOG_TRACE, " 0x%02x,", (*g)[i]);
188 av_log(NULL, AV_LOG_TRACE, "}\n");
189 }
190 #undef PRINT_IF_GUID
191 #else
192 #define print_guid(g) while(0)
193 #endif
194
asf_probe(const AVProbeData * pd)195 static int asf_probe(const AVProbeData *pd)
196 {
197 /* check file header */
198 if (!ff_guidcmp(pd->buf, &ff_asf_header))
199 return AVPROBE_SCORE_MAX;
200 else
201 return 0;
202 }
203
204 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
205 * but 16 bit for "Metadata Object" and "Metadata Library Object" */
get_value(AVIOContext * pb,int type,int type2_size)206 static int get_value(AVIOContext *pb, int type, int type2_size)
207 {
208 switch (type) {
209 case 2:
210 return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
211 case 3:
212 return avio_rl32(pb);
213 case 4:
214 return avio_rl64(pb);
215 case 5:
216 return avio_rl16(pb);
217 default:
218 return INT_MIN;
219 }
220 }
221
222 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
223 * but in reality this is only loosely similar */
asf_read_picture(AVFormatContext * s,int len)224 static int asf_read_picture(AVFormatContext *s, int len)
225 {
226 AVPacket pkt = { 0 };
227 const CodecMime *mime = ff_id3v2_mime_tags;
228 enum AVCodecID id = AV_CODEC_ID_NONE;
229 char mimetype[64];
230 uint8_t *desc = NULL;
231 AVStream *st = NULL;
232 int ret, type, picsize, desc_len;
233
234 /* type + picsize + mime + desc */
235 if (len < 1 + 4 + 2 + 2) {
236 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
237 return AVERROR_INVALIDDATA;
238 }
239
240 /* picture type */
241 type = avio_r8(s->pb);
242 len--;
243 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
244 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
245 type = 0;
246 }
247
248 /* picture data size */
249 picsize = avio_rl32(s->pb);
250 len -= 4;
251
252 /* picture MIME type */
253 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
254 while (mime->id != AV_CODEC_ID_NONE) {
255 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
256 id = mime->id;
257 break;
258 }
259 mime++;
260 }
261 if (id == AV_CODEC_ID_NONE) {
262 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
263 mimetype);
264 return 0;
265 }
266
267 if (picsize >= len) {
268 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
269 picsize, len);
270 return AVERROR_INVALIDDATA;
271 }
272
273 /* picture description */
274 desc_len = (len - picsize) * 2 + 1;
275 desc = av_malloc(desc_len);
276 if (!desc)
277 return AVERROR(ENOMEM);
278 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
279
280 ret = av_get_packet(s->pb, &pkt, picsize);
281 if (ret < 0)
282 goto fail;
283
284 st = avformat_new_stream(s, NULL);
285 if (!st) {
286 ret = AVERROR(ENOMEM);
287 goto fail;
288 }
289 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
290 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
291 st->codecpar->codec_id = id;
292 st->attached_pic = pkt;
293 st->attached_pic.stream_index = st->index;
294 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
295
296 if (*desc)
297 av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
298 else
299 av_freep(&desc);
300
301 av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
302
303 return 0;
304
305 fail:
306 av_freep(&desc);
307 av_packet_unref(&pkt);
308 return ret;
309 }
310
get_id3_tag(AVFormatContext * s,int len)311 static void get_id3_tag(AVFormatContext *s, int len)
312 {
313 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
314
315 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
316 if (id3v2_extra_meta) {
317 ff_id3v2_parse_apic(s, id3v2_extra_meta);
318 ff_id3v2_parse_chapters(s, id3v2_extra_meta);
319 }
320 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
321 }
322
get_tag(AVFormatContext * s,const char * key,int type,int len,int type2_size)323 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
324 {
325 ASFContext *asf = s->priv_data;
326 char *value = NULL;
327 int64_t off = avio_tell(s->pb);
328 #define LEN 22
329
330 av_assert0((unsigned)len < (INT_MAX - LEN) / 2);
331
332 if (!asf->export_xmp && !strncmp(key, "xmp", 3))
333 goto finish;
334
335 value = av_malloc(2 * len + LEN);
336 if (!value)
337 goto finish;
338
339 switch (type) {
340 case ASF_UNICODE:
341 avio_get_str16le(s->pb, len, value, 2 * len + 1);
342 break;
343 case -1: // ASCI
344 avio_read(s->pb, value, len);
345 value[len]=0;
346 break;
347 case ASF_BYTE_ARRAY:
348 if (!strcmp(key, "WM/Picture")) { // handle cover art
349 asf_read_picture(s, len);
350 } else if (!strcmp(key, "ID3")) { // handle ID3 tag
351 get_id3_tag(s, len);
352 } else {
353 av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
354 }
355 goto finish;
356 case ASF_BOOL:
357 case ASF_DWORD:
358 case ASF_QWORD:
359 case ASF_WORD: {
360 uint64_t num = get_value(s->pb, type, type2_size);
361 snprintf(value, LEN, "%"PRIu64, num);
362 break;
363 }
364 case ASF_GUID:
365 av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
366 goto finish;
367 default:
368 av_log(s, AV_LOG_DEBUG,
369 "Unsupported value type %d in tag %s.\n", type, key);
370 goto finish;
371 }
372 if (*value)
373 av_dict_set(&s->metadata, key, value, 0);
374
375 finish:
376 av_freep(&value);
377 avio_seek(s->pb, off + len, SEEK_SET);
378 }
379
asf_read_file_properties(AVFormatContext * s,int64_t size)380 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
381 {
382 ASFContext *asf = s->priv_data;
383 AVIOContext *pb = s->pb;
384
385 ff_get_guid(pb, &asf->hdr.guid);
386 asf->hdr.file_size = avio_rl64(pb);
387 asf->hdr.create_time = avio_rl64(pb);
388 avio_rl64(pb); /* number of packets */
389 asf->hdr.play_time = avio_rl64(pb);
390 asf->hdr.send_time = avio_rl64(pb);
391 asf->hdr.preroll = avio_rl32(pb);
392 asf->hdr.ignore = avio_rl32(pb);
393 asf->hdr.flags = avio_rl32(pb);
394 asf->hdr.min_pktsize = avio_rl32(pb);
395 asf->hdr.max_pktsize = avio_rl32(pb);
396 if (asf->hdr.min_pktsize >= (1U << 29))
397 return AVERROR_INVALIDDATA;
398 asf->hdr.max_bitrate = avio_rl32(pb);
399 s->packet_size = asf->hdr.max_pktsize;
400
401 return 0;
402 }
403
asf_read_stream_properties(AVFormatContext * s,int64_t size)404 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
405 {
406 ASFContext *asf = s->priv_data;
407 AVIOContext *pb = s->pb;
408 AVStream *st;
409 ASFStream *asf_st;
410 ff_asf_guid g;
411 enum AVMediaType type;
412 int type_specific_size, sizeX;
413 unsigned int tag1;
414 int64_t pos1, pos2, start_time;
415 int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
416
417 if (s->nb_streams == ASF_MAX_STREAMS) {
418 av_log(s, AV_LOG_ERROR, "too many streams\n");
419 return AVERROR(EINVAL);
420 }
421
422 pos1 = avio_tell(pb);
423
424 st = avformat_new_stream(s, NULL);
425 if (!st)
426 return AVERROR(ENOMEM);
427 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
428 start_time = asf->hdr.preroll;
429
430 if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
431 int64_t fsize = avio_size(pb);
432 if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
433 FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size)/20)
434 st->duration = asf->hdr.play_time /
435 (10000000 / 1000) - start_time;
436 }
437 ff_get_guid(pb, &g);
438
439 test_for_ext_stream_audio = 0;
440 if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
441 type = AVMEDIA_TYPE_AUDIO;
442 } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
443 type = AVMEDIA_TYPE_VIDEO;
444 } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
445 type = AVMEDIA_TYPE_VIDEO;
446 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
447 } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
448 type = AVMEDIA_TYPE_DATA;
449 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
450 test_for_ext_stream_audio = 1;
451 type = AVMEDIA_TYPE_UNKNOWN;
452 } else {
453 return -1;
454 }
455 ff_get_guid(pb, &g);
456 avio_skip(pb, 8); /* total_size */
457 type_specific_size = avio_rl32(pb);
458 avio_rl32(pb);
459 st->id = avio_rl16(pb) & 0x7f; /* stream id */
460 // mapping of asf ID to AV stream ID;
461 asf->asfid2avid[st->id] = s->nb_streams - 1;
462 asf_st = &asf->streams[st->id];
463
464 avio_rl32(pb);
465
466 if (test_for_ext_stream_audio) {
467 ff_get_guid(pb, &g);
468 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
469 type = AVMEDIA_TYPE_AUDIO;
470 is_dvr_ms_audio = 1;
471 ff_get_guid(pb, &g);
472 avio_rl32(pb);
473 avio_rl32(pb);
474 avio_rl32(pb);
475 ff_get_guid(pb, &g);
476 avio_rl32(pb);
477 }
478 }
479
480 st->codecpar->codec_type = type;
481 if (type == AVMEDIA_TYPE_AUDIO) {
482 int ret = ff_get_wav_header(s, pb, st->codecpar, type_specific_size, 0);
483 if (ret < 0)
484 return ret;
485 if (is_dvr_ms_audio) {
486 // codec_id and codec_tag are unreliable in dvr_ms
487 // files. Set them later by probing stream.
488 st->internal->request_probe = 1;
489 st->codecpar->codec_tag = 0;
490 }
491 if (st->codecpar->codec_id == AV_CODEC_ID_AAC)
492 st->need_parsing = AVSTREAM_PARSE_NONE;
493 else
494 st->need_parsing = AVSTREAM_PARSE_FULL;
495 /* We have to init the frame size at some point .... */
496 pos2 = avio_tell(pb);
497 if (size >= (pos2 + 8 - pos1 + 24)) {
498 asf_st->ds_span = avio_r8(pb);
499 asf_st->ds_packet_size = avio_rl16(pb);
500 asf_st->ds_chunk_size = avio_rl16(pb);
501 avio_rl16(pb); // ds_data_size
502 avio_r8(pb); // ds_silence_data
503 }
504 if (asf_st->ds_span > 1) {
505 if (!asf_st->ds_chunk_size ||
506 (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
507 asf_st->ds_packet_size % asf_st->ds_chunk_size)
508 asf_st->ds_span = 0; // disable descrambling
509 }
510 } else if (type == AVMEDIA_TYPE_VIDEO &&
511 size - (avio_tell(pb) - pos1 + 24) >= 51) {
512 avio_rl32(pb);
513 avio_rl32(pb);
514 avio_r8(pb);
515 avio_rl16(pb); /* size */
516 sizeX = avio_rl32(pb); /* size */
517 st->codecpar->width = avio_rl32(pb);
518 st->codecpar->height = avio_rl32(pb);
519 /* not available for asf */
520 avio_rl16(pb); /* panes */
521 st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
522 tag1 = avio_rl32(pb);
523 avio_skip(pb, 20);
524 if (sizeX > 40) {
525 if (size < sizeX - 40)
526 return AVERROR_INVALIDDATA;
527 st->codecpar->extradata_size = ffio_limit(pb, sizeX - 40);
528 st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size +
529 AV_INPUT_BUFFER_PADDING_SIZE);
530 if (!st->codecpar->extradata)
531 return AVERROR(ENOMEM);
532 avio_read(pb, st->codecpar->extradata, st->codecpar->extradata_size);
533 }
534
535 /* Extract palette from extradata if bpp <= 8 */
536 /* This code assumes that extradata contains only palette */
537 /* This is true for all paletted codecs implemented in libavcodec */
538 if (st->codecpar->extradata_size && (st->codecpar->bits_per_coded_sample <= 8)) {
539 #if HAVE_BIGENDIAN
540 int i;
541 for (i = 0; i < FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE) / 4; i++)
542 asf_st->palette[i] = av_bswap32(((uint32_t *)st->codecpar->extradata)[i]);
543 #else
544 memcpy(asf_st->palette, st->codecpar->extradata,
545 FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE));
546 #endif
547 asf_st->palette_changed = 1;
548 }
549
550 st->codecpar->codec_tag = tag1;
551 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
552 if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
553 st->need_parsing = AVSTREAM_PARSE_FULL;
554 /* issue658 contains wrong w/h and MS even puts a fake seq header
555 * with wrong w/h in extradata while a correct one is in the stream.
556 * maximum lameness */
557 st->codecpar->width =
558 st->codecpar->height = 0;
559 av_freep(&st->codecpar->extradata);
560 st->codecpar->extradata_size = 0;
561 }
562 if (st->codecpar->codec_id == AV_CODEC_ID_H264)
563 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
564 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4)
565 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
566 }
567 pos2 = avio_tell(pb);
568 avio_skip(pb, size - (pos2 - pos1 + 24));
569
570 return 0;
571 }
572
asf_read_ext_stream_properties(AVFormatContext * s,int64_t size)573 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
574 {
575 ASFContext *asf = s->priv_data;
576 AVIOContext *pb = s->pb;
577 ff_asf_guid g;
578 int ext_len, payload_ext_ct, stream_ct, i;
579 uint32_t leak_rate, stream_num;
580 unsigned int stream_languageid_index;
581
582 avio_rl64(pb); // starttime
583 avio_rl64(pb); // endtime
584 leak_rate = avio_rl32(pb); // leak-datarate
585 avio_rl32(pb); // bucket-datasize
586 avio_rl32(pb); // init-bucket-fullness
587 avio_rl32(pb); // alt-leak-datarate
588 avio_rl32(pb); // alt-bucket-datasize
589 avio_rl32(pb); // alt-init-bucket-fullness
590 avio_rl32(pb); // max-object-size
591 avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
592 stream_num = avio_rl16(pb); // stream-num
593
594 stream_languageid_index = avio_rl16(pb); // stream-language-id-index
595 if (stream_num < 128)
596 asf->streams[stream_num].stream_language_index = stream_languageid_index;
597
598 avio_rl64(pb); // avg frametime in 100ns units
599 stream_ct = avio_rl16(pb); // stream-name-count
600 payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
601
602 if (stream_num < 128) {
603 asf->stream_bitrates[stream_num] = leak_rate;
604 asf->streams[stream_num].payload_ext_ct = 0;
605 }
606
607 for (i = 0; i < stream_ct; i++) {
608 avio_rl16(pb);
609 ext_len = avio_rl16(pb);
610 avio_skip(pb, ext_len);
611 }
612
613 for (i = 0; i < payload_ext_ct; i++) {
614 int size;
615 ff_get_guid(pb, &g);
616 size = avio_rl16(pb);
617 ext_len = avio_rl32(pb);
618 if (ext_len < 0)
619 return AVERROR_INVALIDDATA;
620 avio_skip(pb, ext_len);
621 if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
622 ASFPayload *p = &asf->streams[stream_num].payload[i];
623 p->type = g[0];
624 p->size = size;
625 av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
626 asf->streams[stream_num].payload_ext_ct ++;
627 }
628 }
629
630 return 0;
631 }
632
asf_read_content_desc(AVFormatContext * s,int64_t size)633 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
634 {
635 AVIOContext *pb = s->pb;
636 int len1, len2, len3, len4, len5;
637
638 len1 = avio_rl16(pb);
639 len2 = avio_rl16(pb);
640 len3 = avio_rl16(pb);
641 len4 = avio_rl16(pb);
642 len5 = avio_rl16(pb);
643 get_tag(s, "title", 0, len1, 32);
644 get_tag(s, "author", 0, len2, 32);
645 get_tag(s, "copyright", 0, len3, 32);
646 get_tag(s, "comment", 0, len4, 32);
647 avio_skip(pb, len5);
648
649 return 0;
650 }
651
asf_read_ext_content_desc(AVFormatContext * s,int64_t size)652 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
653 {
654 AVIOContext *pb = s->pb;
655 ASFContext *asf = s->priv_data;
656 int desc_count, i, ret;
657
658 desc_count = avio_rl16(pb);
659 for (i = 0; i < desc_count; i++) {
660 int name_len, value_type, value_len;
661 char name[1024];
662
663 name_len = avio_rl16(pb);
664 if (name_len % 2) // must be even, broken lavf versions wrote len-1
665 name_len += 1;
666 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
667 avio_skip(pb, name_len - ret);
668 value_type = avio_rl16(pb);
669 value_len = avio_rl16(pb);
670 if (!value_type && value_len % 2)
671 value_len += 1;
672 /* My sample has that stream set to 0 maybe that mean the container.
673 * ASF stream count starts at 1. I am using 0 to the container value
674 * since it's unused. */
675 if (!strcmp(name, "AspectRatioX"))
676 asf->dar[0].num = get_value(s->pb, value_type, 32);
677 else if (!strcmp(name, "AspectRatioY"))
678 asf->dar[0].den = get_value(s->pb, value_type, 32);
679 else
680 get_tag(s, name, value_type, value_len, 32);
681 }
682
683 return 0;
684 }
685
asf_read_language_list(AVFormatContext * s,int64_t size)686 static int asf_read_language_list(AVFormatContext *s, int64_t size)
687 {
688 AVIOContext *pb = s->pb;
689 ASFContext *asf = s->priv_data;
690 int j, ret;
691 int stream_count = avio_rl16(pb);
692 for (j = 0; j < stream_count; j++) {
693 char lang[6];
694 unsigned int lang_len = avio_r8(pb);
695 if ((ret = avio_get_str16le(pb, lang_len, lang,
696 sizeof(lang))) < lang_len)
697 avio_skip(pb, lang_len - ret);
698 if (j < 128)
699 av_strlcpy(asf->stream_languages[j], lang,
700 sizeof(*asf->stream_languages));
701 }
702
703 return 0;
704 }
705
asf_read_metadata(AVFormatContext * s,int64_t size)706 static int asf_read_metadata(AVFormatContext *s, int64_t size)
707 {
708 AVIOContext *pb = s->pb;
709 ASFContext *asf = s->priv_data;
710 int n, stream_num, name_len_utf16, name_len_utf8, value_len;
711 int ret, i;
712 n = avio_rl16(pb);
713
714 for (i = 0; i < n; i++) {
715 uint8_t *name;
716 int value_type;
717
718 avio_rl16(pb); // lang_list_index
719 stream_num = avio_rl16(pb);
720 name_len_utf16 = avio_rl16(pb);
721 value_type = avio_rl16(pb); /* value_type */
722 value_len = avio_rl32(pb);
723
724 if (value_len < 0 || value_len > UINT16_MAX)
725 return AVERROR_INVALIDDATA;
726
727 name_len_utf8 = 2*name_len_utf16 + 1;
728 name = av_malloc(name_len_utf8);
729 if (!name)
730 return AVERROR(ENOMEM);
731
732 if ((ret = avio_get_str16le(pb, name_len_utf16, name, name_len_utf8)) < name_len_utf16)
733 avio_skip(pb, name_len_utf16 - ret);
734 av_log(s, AV_LOG_TRACE, "%d stream %d name_len %2d type %d len %4d <%s>\n",
735 i, stream_num, name_len_utf16, value_type, value_len, name);
736
737 if (!strcmp(name, "AspectRatioX")){
738 int aspect_x = get_value(s->pb, value_type, 16);
739 if(stream_num < 128)
740 asf->dar[stream_num].num = aspect_x;
741 } else if(!strcmp(name, "AspectRatioY")){
742 int aspect_y = get_value(s->pb, value_type, 16);
743 if(stream_num < 128)
744 asf->dar[stream_num].den = aspect_y;
745 } else {
746 get_tag(s, name, value_type, value_len, 16);
747 }
748 av_freep(&name);
749 }
750
751 return 0;
752 }
753
asf_read_marker(AVFormatContext * s,int64_t size)754 static int asf_read_marker(AVFormatContext *s, int64_t size)
755 {
756 AVIOContext *pb = s->pb;
757 ASFContext *asf = s->priv_data;
758 int i, count, name_len, ret;
759 char name[1024];
760
761 avio_rl64(pb); // reserved 16 bytes
762 avio_rl64(pb); // ...
763 count = avio_rl32(pb); // markers count
764 avio_rl16(pb); // reserved 2 bytes
765 name_len = avio_rl16(pb); // name length
766 avio_skip(pb, name_len);
767
768 for (i = 0; i < count; i++) {
769 int64_t pres_time;
770 int name_len;
771
772 if (avio_feof(pb))
773 return AVERROR_INVALIDDATA;
774
775 avio_rl64(pb); // offset, 8 bytes
776 pres_time = avio_rl64(pb); // presentation time
777 pres_time -= asf->hdr.preroll * 10000;
778 avio_rl16(pb); // entry length
779 avio_rl32(pb); // send time
780 avio_rl32(pb); // flags
781 name_len = avio_rl32(pb); // name length
782 if ((unsigned)name_len > INT_MAX / 2)
783 return AVERROR_INVALIDDATA;
784 if ((ret = avio_get_str16le(pb, name_len * 2, name,
785 sizeof(name))) < name_len)
786 avio_skip(pb, name_len - ret);
787 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
788 AV_NOPTS_VALUE, name);
789 }
790
791 return 0;
792 }
793
asf_read_header(AVFormatContext * s)794 static int asf_read_header(AVFormatContext *s)
795 {
796 ASFContext *asf = s->priv_data;
797 ff_asf_guid g;
798 AVIOContext *pb = s->pb;
799 int i;
800 int64_t gsize;
801
802 ff_get_guid(pb, &g);
803 if (ff_guidcmp(&g, &ff_asf_header))
804 return AVERROR_INVALIDDATA;
805 avio_rl64(pb);
806 avio_rl32(pb);
807 avio_r8(pb);
808 avio_r8(pb);
809 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
810
811 for (i = 0; i<128; i++)
812 asf->streams[i].stream_language_index = 128; // invalid stream index means no language info
813
814 for (;;) {
815 uint64_t gpos = avio_tell(pb);
816 int ret = 0;
817 ff_get_guid(pb, &g);
818 gsize = avio_rl64(pb);
819 print_guid(&g);
820 if (!ff_guidcmp(&g, &ff_asf_data_header)) {
821 asf->data_object_offset = avio_tell(pb);
822 /* If not streaming, gsize is not unlimited (how?),
823 * and there is enough space in the file.. */
824 if (!(asf->hdr.flags & 0x01) && gsize >= 100)
825 asf->data_object_size = gsize - 24;
826 else
827 asf->data_object_size = (uint64_t)-1;
828 break;
829 }
830 if (gsize < 24)
831 return AVERROR_INVALIDDATA;
832 if (!ff_guidcmp(&g, &ff_asf_file_header)) {
833 ret = asf_read_file_properties(s, gsize);
834 } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
835 ret = asf_read_stream_properties(s, gsize);
836 } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
837 asf_read_content_desc(s, gsize);
838 } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
839 asf_read_language_list(s, gsize);
840 } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
841 asf_read_ext_content_desc(s, gsize);
842 } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
843 asf_read_metadata(s, gsize);
844 } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
845 asf_read_metadata(s, gsize);
846 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
847 asf_read_ext_stream_properties(s, gsize);
848
849 // there could be an optional stream properties object to follow
850 // if so the next iteration will pick it up
851 continue;
852 } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
853 ff_get_guid(pb, &g);
854 avio_skip(pb, 6);
855 continue;
856 } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
857 asf_read_marker(s, gsize);
858 } else if (avio_feof(pb)) {
859 return AVERROR_EOF;
860 } else {
861 if (!s->keylen) {
862 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
863 unsigned int len;
864 AVPacket pkt;
865 av_log(s, AV_LOG_WARNING,
866 "DRM protected stream detected, decoding will likely fail!\n");
867 len= avio_rl32(pb);
868 av_log(s, AV_LOG_DEBUG, "Secret data:\n");
869
870 if ((ret = av_get_packet(pb, &pkt, len)) < 0)
871 return ret;
872 av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size);
873 av_packet_unref(&pkt);
874
875 len= avio_rl32(pb);
876 if (len > UINT16_MAX)
877 return AVERROR_INVALIDDATA;
878 get_tag(s, "ASF_Protection_Type", -1, len, 32);
879
880 len= avio_rl32(pb);
881 if (len > UINT16_MAX)
882 return AVERROR_INVALIDDATA;
883 get_tag(s, "ASF_Key_ID", -1, len, 32);
884
885 len= avio_rl32(pb);
886 if (len > UINT16_MAX)
887 return AVERROR_INVALIDDATA;
888 get_tag(s, "ASF_License_URL", -1, len, 32);
889 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
890 av_log(s, AV_LOG_WARNING,
891 "Ext DRM protected stream detected, decoding will likely fail!\n");
892 av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
893 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
894 av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
895 }
896 }
897 }
898 if (ret < 0)
899 return ret;
900
901 if (avio_tell(pb) != gpos + gsize)
902 av_log(s, AV_LOG_DEBUG,
903 "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
904 avio_tell(pb) - gpos, gsize);
905 avio_seek(pb, gpos + gsize, SEEK_SET);
906 }
907 ff_get_guid(pb, &g);
908 avio_rl64(pb);
909 avio_r8(pb);
910 avio_r8(pb);
911 if (avio_feof(pb))
912 return AVERROR_EOF;
913 asf->data_offset = avio_tell(pb);
914 asf->packet_size_left = 0;
915
916 for (i = 0; i < 128; i++) {
917 int stream_num = asf->asfid2avid[i];
918 if (stream_num >= 0) {
919 AVStream *st = s->streams[stream_num];
920 if (!st->codecpar->bit_rate)
921 st->codecpar->bit_rate = asf->stream_bitrates[i];
922 if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
923 av_reduce(&st->sample_aspect_ratio.num,
924 &st->sample_aspect_ratio.den,
925 asf->dar[i].num, asf->dar[i].den, INT_MAX);
926 } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
927 // Use ASF container value if the stream doesn't set AR.
928 (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
929 av_reduce(&st->sample_aspect_ratio.num,
930 &st->sample_aspect_ratio.den,
931 asf->dar[0].num, asf->dar[0].den, INT_MAX);
932
933 av_log(s, AV_LOG_TRACE, "i=%d, st->codecpar->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
934 i, st->codecpar->codec_type, asf->dar[i].num, asf->dar[i].den,
935 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
936
937 // copy and convert language codes to the frontend
938 if (asf->streams[i].stream_language_index < 128) {
939 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
940 if (rfc1766 && strlen(rfc1766) > 1) {
941 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
942 const char *iso6392 = ff_convert_lang_to(primary_tag,
943 AV_LANG_ISO639_2_BIBL);
944 if (iso6392)
945 av_dict_set(&st->metadata, "language", iso6392, 0);
946 }
947 }
948 }
949 }
950
951 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
952
953 return 0;
954 }
955
956 #define DO_2BITS(bits, var, defval) \
957 switch (bits & 3) { \
958 case 3: \
959 var = avio_rl32(pb); \
960 rsize += 4; \
961 break; \
962 case 2: \
963 var = avio_rl16(pb); \
964 rsize += 2; \
965 break; \
966 case 1: \
967 var = avio_r8(pb); \
968 rsize++; \
969 break; \
970 default: \
971 var = defval; \
972 break; \
973 }
974
975 /**
976 * Load a single ASF packet into the demuxer.
977 * @param s demux context
978 * @param pb context to read data from
979 * @return 0 on success, <0 on error
980 */
asf_get_packet(AVFormatContext * s,AVIOContext * pb)981 static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
982 {
983 ASFContext *asf = s->priv_data;
984 uint32_t packet_length, padsize;
985 int rsize = 8;
986 int c, d, e, off;
987
988 if (asf->uses_std_ecc > 0) {
989 // if we do not know packet size, allow skipping up to 32 kB
990 off = 32768;
991 if (asf->no_resync_search)
992 off = 3;
993 // else if (s->packet_size > 0 && !asf->uses_std_ecc)
994 // off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
995
996 c = d = e = -1;
997 while (off-- > 0) {
998 c = d;
999 d = e;
1000 e = avio_r8(pb);
1001 if (c == 0x82 && !d && !e)
1002 break;
1003 }
1004
1005 if (c != 0x82) {
1006 /* This code allows handling of -EAGAIN at packet boundaries (i.e.
1007 * if the packet sync code above triggers -EAGAIN). This does not
1008 * imply complete -EAGAIN handling support at random positions in
1009 * the stream. */
1010 if (pb->error == AVERROR(EAGAIN))
1011 return AVERROR(EAGAIN);
1012 if (!avio_feof(pb))
1013 av_log(s, AV_LOG_ERROR,
1014 "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
1015 }
1016 if ((c & 0x8f) == 0x82) {
1017 if (d || e) {
1018 if (!avio_feof(pb))
1019 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
1020 return AVERROR_INVALIDDATA;
1021 }
1022 c = avio_r8(pb);
1023 d = avio_r8(pb);
1024 rsize += 3;
1025 } else if(!avio_feof(pb)) {
1026 avio_seek(pb, -1, SEEK_CUR); // FIXME
1027 }
1028 } else {
1029 c = avio_r8(pb);
1030 if (c & 0x80) {
1031 rsize ++;
1032 if (!(c & 0x60)) {
1033 d = avio_r8(pb);
1034 e = avio_r8(pb);
1035 avio_seek(pb, (c & 0xF) - 2, SEEK_CUR);
1036 rsize += c & 0xF;
1037 }
1038
1039 if (c != 0x82)
1040 avpriv_request_sample(s, "Invalid ECC byte");
1041
1042 if (!asf->uses_std_ecc)
1043 asf->uses_std_ecc = (c == 0x82 && !d && !e) ? 1 : -1;
1044
1045 c = avio_r8(pb);
1046 } else
1047 asf->uses_std_ecc = -1;
1048 d = avio_r8(pb);
1049 }
1050
1051 asf->packet_flags = c;
1052 asf->packet_property = d;
1053
1054 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
1055 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
1056 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
1057
1058 // the following checks prevent overflows and infinite loops
1059 if (!packet_length || packet_length >= (1U << 29)) {
1060 av_log(s, AV_LOG_ERROR,
1061 "invalid packet_length %"PRIu32" at:%"PRId64"\n",
1062 packet_length, avio_tell(pb));
1063 return AVERROR_INVALIDDATA;
1064 }
1065 if (padsize >= packet_length) {
1066 av_log(s, AV_LOG_ERROR,
1067 "invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
1068 return AVERROR_INVALIDDATA;
1069 }
1070
1071 asf->packet_timestamp = avio_rl32(pb);
1072 avio_rl16(pb); /* duration */
1073 // rsize has at least 11 bytes which have to be present
1074
1075 if (asf->packet_flags & 0x01) {
1076 asf->packet_segsizetype = avio_r8(pb);
1077 rsize++;
1078 asf->packet_segments = asf->packet_segsizetype & 0x3f;
1079 } else {
1080 asf->packet_segments = 1;
1081 asf->packet_segsizetype = 0x80;
1082 }
1083 if (rsize > packet_length - padsize) {
1084 asf->packet_size_left = 0;
1085 av_log(s, AV_LOG_ERROR,
1086 "invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
1087 rsize, packet_length, padsize, avio_tell(pb));
1088 return AVERROR_INVALIDDATA;
1089 }
1090 asf->packet_size_left = packet_length - padsize - rsize;
1091 if (packet_length < asf->hdr.min_pktsize)
1092 padsize += asf->hdr.min_pktsize - packet_length;
1093 asf->packet_padsize = padsize;
1094 av_log(s, AV_LOG_TRACE, "packet: size=%d padsize=%d left=%d\n",
1095 s->packet_size, asf->packet_padsize, asf->packet_size_left);
1096 return 0;
1097 }
1098
1099 /**
1100 *
1101 * @return <0 if error
1102 */
asf_read_frame_header(AVFormatContext * s,AVIOContext * pb)1103 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
1104 {
1105 ASFContext *asf = s->priv_data;
1106 ASFStream *asfst;
1107 int rsize = 1;
1108 int num = avio_r8(pb);
1109 int i;
1110 int64_t ts0, ts1 av_unused;
1111
1112 asf->packet_segments--;
1113 asf->packet_key_frame = num >> 7;
1114 asf->stream_index = asf->asfid2avid[num & 0x7f];
1115 asfst = &asf->streams[num & 0x7f];
1116 // sequence should be ignored!
1117 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
1118 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
1119 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
1120 av_log(asf, AV_LOG_TRACE, "key:%d stream:%d seq:%d offset:%d replic_size:%d num:%X packet_property %X\n",
1121 asf->packet_key_frame, asf->stream_index, asf->packet_seq,
1122 asf->packet_frag_offset, asf->packet_replic_size, num, asf->packet_property);
1123 if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {
1124 av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
1125 return AVERROR_INVALIDDATA;
1126 }
1127 if (asf->packet_replic_size >= 8) {
1128 int64_t end = avio_tell(pb) + asf->packet_replic_size;
1129 AVRational aspect;
1130 asfst->packet_obj_size = avio_rl32(pb);
1131 if (asfst->packet_obj_size >= (1 << 24) || asfst->packet_obj_size < 0) {
1132 av_log(s, AV_LOG_ERROR, "packet_obj_size %d invalid\n", asfst->packet_obj_size);
1133 asfst->packet_obj_size = 0;
1134 return AVERROR_INVALIDDATA;
1135 }
1136 asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
1137
1138 for (i = 0; i < asfst->payload_ext_ct; i++) {
1139 ASFPayload *p = &asfst->payload[i];
1140 int size = p->size;
1141 int64_t payend;
1142 if (size == 0xFFFF)
1143 size = avio_rl16(pb);
1144 payend = avio_tell(pb) + size;
1145 if (payend > end) {
1146 av_log(s, AV_LOG_ERROR, "too long payload\n");
1147 break;
1148 }
1149 switch (p->type) {
1150 case 0x50:
1151 // duration = avio_rl16(pb);
1152 break;
1153 case 0x54:
1154 aspect.num = avio_r8(pb);
1155 aspect.den = avio_r8(pb);
1156 if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
1157 s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
1158 }
1159 break;
1160 case 0x2A:
1161 avio_skip(pb, 8);
1162 ts0 = avio_rl64(pb);
1163 ts1 = avio_rl64(pb);
1164 if (ts0!= -1) asf->packet_frag_timestamp = ts0/10000;
1165 else asf->packet_frag_timestamp = AV_NOPTS_VALUE;
1166 asf->ts_is_pts = 1;
1167 break;
1168 case 0x5B:
1169 case 0xB7:
1170 case 0xCC:
1171 case 0xC0:
1172 case 0xA0:
1173 //unknown
1174 break;
1175 }
1176 avio_seek(pb, payend, SEEK_SET);
1177 }
1178
1179 avio_seek(pb, end, SEEK_SET);
1180 rsize += asf->packet_replic_size; // FIXME - check validity
1181 } else if (asf->packet_replic_size == 1) {
1182 // multipacket - frag_offset is beginning timestamp
1183 asf->packet_time_start = asf->packet_frag_offset;
1184 asf->packet_frag_offset = 0;
1185 asf->packet_frag_timestamp = asf->packet_timestamp;
1186
1187 asf->packet_time_delta = avio_r8(pb);
1188 rsize++;
1189 } else if (asf->packet_replic_size != 0) {
1190 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1191 asf->packet_replic_size);
1192 return AVERROR_INVALIDDATA;
1193 }
1194 if (asf->packet_flags & 0x01) {
1195 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1196 if (rsize > asf->packet_size_left) {
1197 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1198 return AVERROR_INVALIDDATA;
1199 } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1200 if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1201 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d>%d-%d+%d)\n",
1202 asf->packet_frag_size, asf->packet_size_left, rsize, asf->packet_padsize);
1203 return AVERROR_INVALIDDATA;
1204 } else {
1205 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1206 asf->packet_size_left += diff;
1207 asf->packet_padsize -= diff;
1208 }
1209 }
1210 } else {
1211 asf->packet_frag_size = asf->packet_size_left - rsize;
1212 }
1213 if (asf->packet_replic_size == 1) {
1214 asf->packet_multi_size = asf->packet_frag_size;
1215 if (asf->packet_multi_size > asf->packet_size_left)
1216 return AVERROR_INVALIDDATA;
1217 }
1218 asf->packet_size_left -= rsize;
1219
1220 return 0;
1221 }
1222
1223 /**
1224 * Parse data from individual ASF packets (which were previously loaded
1225 * with asf_get_packet()).
1226 * @param s demux context
1227 * @param pb context to read data from
1228 * @param pkt pointer to store packet data into
1229 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
1230 * packets need to be loaded (through asf_get_packet())
1231 */
asf_parse_packet(AVFormatContext * s,AVIOContext * pb,AVPacket * pkt)1232 static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1233 {
1234 ASFContext *asf = s->priv_data;
1235 ASFStream *asf_st = 0;
1236 for (;;) {
1237 int ret;
1238 if (avio_feof(pb))
1239 return AVERROR_EOF;
1240 if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1241 asf->packet_segments < 1 && asf->packet_time_start == 0) {
1242 int ret = asf->packet_size_left + asf->packet_padsize;
1243
1244 if (asf->packet_size_left && asf->packet_size_left < FRAME_HEADER_SIZE)
1245 av_log(s, AV_LOG_WARNING, "Skip due to FRAME_HEADER_SIZE\n");
1246
1247 assert(ret >= 0);
1248 /* fail safe */
1249 avio_skip(pb, ret);
1250
1251 asf->packet_pos = avio_tell(pb);
1252 if (asf->data_object_size != (uint64_t)-1 &&
1253 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1254 return AVERROR_EOF; /* Do not exceed the size of the data object */
1255 return 1;
1256 }
1257 if (asf->packet_time_start == 0) {
1258 if (asf_read_frame_header(s, pb) < 0) {
1259 asf->packet_time_start = asf->packet_segments = 0;
1260 continue;
1261 }
1262 if (asf->stream_index < 0 ||
1263 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1264 (!asf->packet_key_frame &&
1265 (s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY || asf->streams[s->streams[asf->stream_index]->id].skip_to_key))) {
1266 asf->packet_time_start = 0;
1267 /* unhandled packet (should not happen) */
1268 avio_skip(pb, asf->packet_frag_size);
1269 asf->packet_size_left -= asf->packet_frag_size;
1270 if (asf->stream_index < 0)
1271 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1272 asf->packet_frag_size);
1273 continue;
1274 }
1275 asf->asf_st = &asf->streams[s->streams[asf->stream_index]->id];
1276 if (!asf->packet_frag_offset)
1277 asf->asf_st->skip_to_key = 0;
1278 }
1279 asf_st = asf->asf_st;
1280 av_assert0(asf_st);
1281
1282 if (!asf_st->frag_offset && asf->packet_frag_offset) {
1283 av_log(s, AV_LOG_TRACE, "skipping asf data pkt with fragment offset for "
1284 "stream:%d, expected:%d but got %d from pkt)\n",
1285 asf->stream_index, asf_st->frag_offset,
1286 asf->packet_frag_offset);
1287 avio_skip(pb, asf->packet_frag_size);
1288 asf->packet_size_left -= asf->packet_frag_size;
1289 continue;
1290 }
1291
1292 if (asf->packet_replic_size == 1) {
1293 // frag_offset is here used as the beginning timestamp
1294 asf->packet_frag_timestamp = asf->packet_time_start;
1295 asf->packet_time_start += asf->packet_time_delta;
1296 asf_st->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1297 asf->packet_size_left--;
1298 asf->packet_multi_size--;
1299 if (asf->packet_multi_size < asf_st->packet_obj_size) {
1300 asf->packet_time_start = 0;
1301 avio_skip(pb, asf->packet_multi_size);
1302 asf->packet_size_left -= asf->packet_multi_size;
1303 continue;
1304 }
1305 asf->packet_multi_size -= asf_st->packet_obj_size;
1306 }
1307
1308 if (asf_st->pkt.size != asf_st->packet_obj_size ||
1309 // FIXME is this condition sufficient?
1310 asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1311 int ret;
1312
1313 if (asf_st->pkt.data) {
1314 av_log(s, AV_LOG_INFO,
1315 "freeing incomplete packet size %d, new %d\n",
1316 asf_st->pkt.size, asf_st->packet_obj_size);
1317 asf_st->frag_offset = 0;
1318 av_packet_unref(&asf_st->pkt);
1319 }
1320 /* new packet */
1321 if ((ret = av_new_packet(&asf_st->pkt, asf_st->packet_obj_size)) < 0)
1322 return ret;
1323 asf_st->seq = asf->packet_seq;
1324 if (asf->ts_is_pts) {
1325 asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
1326 } else
1327 asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1328 asf_st->pkt.stream_index = asf->stream_index;
1329 asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1330 asf_st->pkt_clean = 0;
1331
1332 if (asf_st->pkt.data && asf_st->palette_changed) {
1333 uint8_t *pal;
1334 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
1335 AVPALETTE_SIZE);
1336 if (!pal) {
1337 av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1338 } else {
1339 memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1340 asf_st->palette_changed = 0;
1341 }
1342 }
1343 av_log(asf, AV_LOG_TRACE, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1344 asf->stream_index, asf->packet_key_frame,
1345 asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1346 s->streams[asf->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO,
1347 asf_st->packet_obj_size);
1348 if (s->streams[asf->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
1349 asf->packet_key_frame = 1;
1350 if (asf->packet_key_frame)
1351 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1352 }
1353
1354 /* read data */
1355 av_log(asf, AV_LOG_TRACE, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1356 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1357 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1358 asf->packet_size_left -= asf->packet_frag_size;
1359 if (asf->packet_size_left < 0)
1360 continue;
1361
1362 if (asf->packet_frag_offset >= asf_st->pkt.size ||
1363 asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1364 av_log(s, AV_LOG_ERROR,
1365 "packet fragment position invalid %u,%u not in %u\n",
1366 asf->packet_frag_offset, asf->packet_frag_size,
1367 asf_st->pkt.size);
1368 continue;
1369 }
1370
1371 if (asf->packet_frag_offset != asf_st->frag_offset && !asf_st->pkt_clean) {
1372 memset(asf_st->pkt.data + asf_st->frag_offset, 0, asf_st->pkt.size - asf_st->frag_offset);
1373 asf_st->pkt_clean = 1;
1374 }
1375
1376 ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1377 asf->packet_frag_size);
1378 if (ret != asf->packet_frag_size) {
1379 if (ret < 0 || asf->packet_frag_offset + ret == 0)
1380 return ret < 0 ? ret : AVERROR_EOF;
1381
1382 if (asf_st->ds_span > 1) {
1383 // scrambling, we can either drop it completely or fill the remainder
1384 // TODO: should we fill the whole packet instead of just the current
1385 // fragment?
1386 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1387 asf->packet_frag_size - ret);
1388 ret = asf->packet_frag_size;
1389 } else {
1390 // no scrambling, so we can return partial packets
1391 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1392 }
1393 }
1394 if (s->key && s->keylen == 20)
1395 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1396 ret);
1397 asf_st->frag_offset += ret;
1398 /* test if whole packet is read */
1399 if (asf_st->frag_offset == asf_st->pkt.size) {
1400 // workaround for macroshit radio DVR-MS files
1401 if (s->streams[asf->stream_index]->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
1402 asf_st->pkt.size > 100) {
1403 int i;
1404 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1405 ;
1406 if (i == asf_st->pkt.size) {
1407 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1408 asf_st->frag_offset = 0;
1409 av_packet_unref(&asf_st->pkt);
1410 continue;
1411 }
1412 }
1413
1414 /* return packet */
1415 if (asf_st->ds_span > 1) {
1416 if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1417 av_log(s, AV_LOG_ERROR,
1418 "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1419 asf_st->pkt.size, asf_st->ds_packet_size,
1420 asf_st->ds_span);
1421 } else {
1422 /* packet descrambling */
1423 AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
1424 AV_INPUT_BUFFER_PADDING_SIZE);
1425 if (buf) {
1426 uint8_t *newdata = buf->data;
1427 int offset = 0;
1428 memset(newdata + asf_st->pkt.size, 0,
1429 AV_INPUT_BUFFER_PADDING_SIZE);
1430 while (offset < asf_st->pkt.size) {
1431 int off = offset / asf_st->ds_chunk_size;
1432 int row = off / asf_st->ds_span;
1433 int col = off % asf_st->ds_span;
1434 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1435 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1436 assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1437 memcpy(newdata + offset,
1438 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1439 asf_st->ds_chunk_size);
1440 offset += asf_st->ds_chunk_size;
1441 }
1442 av_buffer_unref(&asf_st->pkt.buf);
1443 asf_st->pkt.buf = buf;
1444 asf_st->pkt.data = buf->data;
1445 }
1446 }
1447 }
1448 asf_st->frag_offset = 0;
1449 *pkt = asf_st->pkt;
1450 asf_st->pkt.buf = 0;
1451 asf_st->pkt.size = 0;
1452 asf_st->pkt.data = 0;
1453 asf_st->pkt.side_data_elems = 0;
1454 asf_st->pkt.side_data = NULL;
1455 break; // packet completed
1456 }
1457 }
1458 return 0;
1459 }
1460
asf_read_packet(AVFormatContext * s,AVPacket * pkt)1461 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1462 {
1463 ASFContext *asf = s->priv_data;
1464
1465 for (;;) {
1466 int ret;
1467
1468 /* parse cached packets, if any */
1469 if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
1470 return ret;
1471 if ((ret = asf_get_packet(s, s->pb)) < 0)
1472 assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1473 asf->packet_segments < 1);
1474 asf->packet_time_start = 0;
1475 }
1476 }
1477
1478 // Added to support seeking after packets have been read
1479 // If information is not reset, read_packet fails due to
1480 // leftover information from previous reads
asf_reset_header(AVFormatContext * s)1481 static void asf_reset_header(AVFormatContext *s)
1482 {
1483 ASFContext *asf = s->priv_data;
1484 ASFStream *asf_st;
1485 int i;
1486
1487 asf->packet_size_left = 0;
1488 asf->packet_flags = 0;
1489 asf->packet_property = 0;
1490 asf->packet_timestamp = 0;
1491 asf->packet_segsizetype = 0;
1492 asf->packet_segments = 0;
1493 asf->packet_seq = 0;
1494 asf->packet_replic_size = 0;
1495 asf->packet_key_frame = 0;
1496 asf->packet_padsize = 0;
1497 asf->packet_frag_offset = 0;
1498 asf->packet_frag_size = 0;
1499 asf->packet_frag_timestamp = 0;
1500 asf->packet_multi_size = 0;
1501 asf->packet_time_delta = 0;
1502 asf->packet_time_start = 0;
1503
1504 for (i = 0; i < 128; i++) {
1505 asf_st = &asf->streams[i];
1506 av_packet_unref(&asf_st->pkt);
1507 asf_st->packet_obj_size = 0;
1508 asf_st->frag_offset = 0;
1509 asf_st->seq = 0;
1510 }
1511 asf->asf_st = NULL;
1512 }
1513
skip_to_key(AVFormatContext * s)1514 static void skip_to_key(AVFormatContext *s)
1515 {
1516 ASFContext *asf = s->priv_data;
1517 int i;
1518
1519 for (i = 0; i < 128; i++) {
1520 int j = asf->asfid2avid[i];
1521 ASFStream *asf_st = &asf->streams[i];
1522 if (j < 0 || s->streams[j]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
1523 continue;
1524
1525 asf_st->skip_to_key = 1;
1526 }
1527 }
1528
asf_read_close(AVFormatContext * s)1529 static int asf_read_close(AVFormatContext *s)
1530 {
1531 asf_reset_header(s);
1532
1533 return 0;
1534 }
1535
asf_read_pts(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)1536 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1537 int64_t *ppos, int64_t pos_limit)
1538 {
1539 ASFContext *asf = s->priv_data;
1540 AVPacket pkt1, *pkt = &pkt1;
1541 ASFStream *asf_st;
1542 int64_t pts;
1543 int64_t pos = *ppos;
1544 int i;
1545 int64_t start_pos[ASF_MAX_STREAMS];
1546
1547 for (i = 0; i < s->nb_streams; i++)
1548 start_pos[i] = pos;
1549
1550 if (s->packet_size > 0)
1551 pos = (pos + s->packet_size - 1 - s->internal->data_offset) /
1552 s->packet_size * s->packet_size +
1553 s->internal->data_offset;
1554 *ppos = pos;
1555 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1556 return AV_NOPTS_VALUE;
1557
1558 ff_read_frame_flush(s);
1559 asf_reset_header(s);
1560 for (;;) {
1561 if (av_read_frame(s, pkt) < 0) {
1562 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1563 return AV_NOPTS_VALUE;
1564 }
1565
1566 pts = pkt->dts;
1567
1568 if (pkt->flags & AV_PKT_FLAG_KEY) {
1569 i = pkt->stream_index;
1570
1571 asf_st = &asf->streams[s->streams[i]->id];
1572
1573 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1574 pos = asf_st->packet_pos;
1575 av_assert1(pkt->pos == asf_st->packet_pos);
1576
1577 av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1578 pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1579 start_pos[i] = asf_st->packet_pos + 1;
1580
1581 if (pkt->stream_index == stream_index) {
1582 av_packet_unref(pkt);
1583 break;
1584 }
1585 }
1586 av_packet_unref(pkt);
1587 }
1588
1589 *ppos = pos;
1590 return pts;
1591 }
1592
asf_build_simple_index(AVFormatContext * s,int stream_index)1593 static int asf_build_simple_index(AVFormatContext *s, int stream_index)
1594 {
1595 ff_asf_guid g;
1596 ASFContext *asf = s->priv_data;
1597 int64_t current_pos = avio_tell(s->pb);
1598 int64_t ret;
1599
1600 if((ret = avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET)) < 0) {
1601 return ret;
1602 }
1603
1604 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1605 goto end;
1606
1607 /* the data object can be followed by other top-level objects,
1608 * skip them until the simple index object is reached */
1609 while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
1610 int64_t gsize = avio_rl64(s->pb);
1611 if (gsize < 24 || avio_feof(s->pb)) {
1612 goto end;
1613 }
1614 avio_skip(s->pb, gsize - 24);
1615 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1616 goto end;
1617 }
1618
1619 {
1620 int64_t itime, last_pos = -1;
1621 int pct, ict;
1622 int i;
1623 int64_t av_unused gsize = avio_rl64(s->pb);
1624 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1625 goto end;
1626 itime = avio_rl64(s->pb);
1627 pct = avio_rl32(s->pb);
1628 ict = avio_rl32(s->pb);
1629 av_log(s, AV_LOG_DEBUG,
1630 "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1631
1632 for (i = 0; i < ict; i++) {
1633 int pktnum = avio_rl32(s->pb);
1634 int pktct = avio_rl16(s->pb);
1635 int64_t pos = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
1636 int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1637
1638 if (avio_feof(s->pb)) {
1639 ret = AVERROR_INVALIDDATA;
1640 goto end;
1641 }
1642
1643 if (pos != last_pos) {
1644 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1645 pktnum, pktct, index_pts);
1646 av_add_index_entry(s->streams[stream_index], pos, index_pts,
1647 s->packet_size, 0, AVINDEX_KEYFRAME);
1648 last_pos = pos;
1649 }
1650 }
1651 asf->index_read = ict > 1;
1652 }
1653 end:
1654 // if (avio_feof(s->pb)) {
1655 // ret = 0;
1656 // }
1657 avio_seek(s->pb, current_pos, SEEK_SET);
1658 return ret;
1659 }
1660
asf_read_seek(AVFormatContext * s,int stream_index,int64_t pts,int flags)1661 static int asf_read_seek(AVFormatContext *s, int stream_index,
1662 int64_t pts, int flags)
1663 {
1664 ASFContext *asf = s->priv_data;
1665 AVStream *st = s->streams[stream_index];
1666 int ret = 0;
1667
1668 if (s->packet_size <= 0)
1669 return -1;
1670
1671 /* Try using the protocol's read_seek if available */
1672 if (s->pb) {
1673 int64_t ret = avio_seek_time(s->pb, stream_index, pts, flags);
1674 if (ret >= 0)
1675 asf_reset_header(s);
1676 if (ret != AVERROR(ENOSYS))
1677 return ret;
1678 }
1679
1680 /* explicitly handle the case of seeking to 0 */
1681 if (!pts) {
1682 asf_reset_header(s);
1683 avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
1684 return 0;
1685 }
1686
1687 if (!asf->index_read) {
1688 ret = asf_build_simple_index(s, stream_index);
1689 if (ret < 0)
1690 asf->index_read = -1;
1691 }
1692
1693 if (asf->index_read > 0 && st->index_entries) {
1694 int index = av_index_search_timestamp(st, pts, flags);
1695 if (index >= 0) {
1696 /* find the position */
1697 uint64_t pos = st->index_entries[index].pos;
1698
1699 /* do the seek */
1700 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1701 if(avio_seek(s->pb, pos, SEEK_SET) < 0)
1702 return -1;
1703 asf_reset_header(s);
1704 skip_to_key(s);
1705 return 0;
1706 }
1707 }
1708 /* no index or seeking by index failed */
1709 if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1710 return -1;
1711 asf_reset_header(s);
1712 skip_to_key(s);
1713 return 0;
1714 }
1715
1716 AVInputFormat ff_asf_demuxer = {
1717 .name = "asf",
1718 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1719 .priv_data_size = sizeof(ASFContext),
1720 .read_probe = asf_probe,
1721 .read_header = asf_read_header,
1722 .read_packet = asf_read_packet,
1723 .read_close = asf_read_close,
1724 .read_seek = asf_read_seek,
1725 .read_timestamp = asf_read_pts,
1726 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1727 .priv_class = &asf_class,
1728 };
1729