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c12d8c79a088fdaa5df0f6315119439959c7375d
[libav.git] / libavformat / asfdec.c
1 /*
2 * Microsoft Advanced Streaming Format demuxer
3 * Copyright (c) 2014 Alexandra Hájková
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/common.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/time_internal.h"
32
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 #define ASF_BOOL 0x2
43 #define ASF_WORD 0x5
44 #define ASF_GUID 0x6
45 #define ASF_DWORD 0x3
46 #define ASF_QWORD 0x4
47 #define ASF_UNICODE 0x0
48 #define ASF_FLAG_BROADCAST 0x1
49 #define ASF_BYTE_ARRAY 0x1
50 #define ASF_TYPE_AUDIO 0x2
51 #define ASF_TYPE_VIDEO 0x1
52 #define ASF_STREAM_NUM 0x7F
53 #define ASF_MAX_STREAMS 128
54 #define BMP_HEADER_SIZE 40
55 #define ASF_NUM_OF_PAYLOADS 0x3F
56 #define ASF_ERROR_CORRECTION_LENGTH_TYPE 0x60
57 #define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
58
59 typedef struct GUIDParseTable {
60 const char *name;
61 ff_asf_guid guid;
62 int (*read_object)(AVFormatContext *, const struct GUIDParseTable *);
63 int is_subobject;
64 } GUIDParseTable;
65
66 typedef struct ASFPacket {
67 AVPacket avpkt;
68 int64_t dts;
69 uint32_t frame_num; // ASF payloads with the same number are parts of the same frame
70 int flags;
71 int data_size;
72 int duration;
73 int size_left;
74 uint8_t stream_index;
75 } ASFPacket;
76
77 typedef struct ASFStream {
78 uint8_t stream_index; // from packet header
79 int index; // stream index in AVFormatContext, set in asf_read_stream_properties
80 int type;
81 int indexed; // added index entries from the Simple Index Object or not
82 int8_t span; // for deinterleaving
83 uint16_t virtual_pkt_len;
84 uint16_t virtual_chunk_len;
85 int16_t lang_idx;
86 ASFPacket pkt;
87 } ASFStream;
88
89 typedef struct ASFStreamData{
90 char langs[32];
91 AVDictionary *asf_met; // for storing per-stream metadata
92 AVRational aspect_ratio;
93 } ASFStreamData;
94
95 typedef struct ASFContext {
96 int data_reached;
97 int is_simple_index; // is simple index present or not 1/0
98 int is_header;
99
100 uint64_t preroll;
101 uint64_t nb_packets; // ASF packets
102 uint32_t packet_size;
103 int64_t send_time;
104 int duration;
105
106 uint32_t b_flags; // flags with broadcast flag
107 uint32_t prop_flags; // file properties object flags
108
109 uint64_t data_size; // data object size
110 uint64_t unknown_size; // size of the unknown object
111
112 int64_t offset; // offset of the current object
113
114 int64_t data_offset;
115 int64_t first_packet_offset; // packet offset
116 int64_t unknown_offset; // for top level header objects or subobjects without specified behavior
117
118 // ASF file must not contain more than 128 streams according to the specification
119 ASFStream *asf_st[ASF_MAX_STREAMS];
120 ASFStreamData asf_sd[ASF_MAX_STREAMS];
121 int nb_streams;
122
123 int stream_index; // from packet header, for the subpayload case
124
125 // packet parameteres
126 uint64_t sub_header_offset; // offset of subplayload header
127 int64_t sub_dts;
128 uint8_t dts_delta; // for subpayloads
129 uint32_t packet_size_internal; // packet size stored inside ASFPacket, can be 0
130 int64_t dts;
131 int64_t packet_offset; // offset of the current packet inside Data Object
132 uint32_t pad_len; // padding after payload
133 uint32_t rep_data_len;
134
135 // packet state
136 uint64_t sub_left; // subpayloads left or not
137 int nb_sub; // number of subpayloads read so far from the current ASF packet
138 uint16_t mult_sub_len; // total length of subpayloads array inside multiple payload
139 uint64_t nb_mult_left; // multiple payloads left
140 int return_subpayload;
141 enum {
142 PARSE_PACKET_HEADER,
143 READ_SINGLE,
144 READ_MULTI,
145 READ_MULTI_SUB
146 } state;
147 } ASFContext;
148
149 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size);
150 static const GUIDParseTable *find_guid(ff_asf_guid guid);
151
152 static int asf_probe(AVProbeData *pd)
153 {
154 /* check file header */
155 if (!ff_guidcmp(pd->buf, &ff_asf_header))
156 return AVPROBE_SCORE_MAX;
157 else
158 return 0;
159 }
160
161 static void swap_guid(ff_asf_guid guid)
162 {
163 FFSWAP(unsigned char, guid[0], guid[3]);
164 FFSWAP(unsigned char, guid[1], guid[2]);
165 FFSWAP(unsigned char, guid[4], guid[5]);
166 FFSWAP(unsigned char, guid[6], guid[7]);
167 }
168
169 static void align_position(AVIOContext *pb, int64_t offset, uint64_t size)
170 {
171 if (avio_tell(pb) != offset + size)
172 avio_seek(pb, offset + size, SEEK_SET);
173 }
174
175 static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
176 {
177 ASFContext *asf = s->priv_data;
178 AVIOContext *pb = s->pb;
179 uint64_t size = avio_rl64(pb);
180 int ret;
181
182 if (asf->is_header)
183 asf->unknown_size = size;
184 asf->is_header = 0;
185 if (!g->is_subobject) {
186 if (!(ret = strcmp(g->name, "Header Extension")))
187 avio_skip(pb, 22); // skip reserved fields and Data Size
188 if ((ret = detect_unknown_subobject(s, asf->unknown_offset,
189 asf->unknown_size)) < 0)
190 return ret;
191 } else
192 avio_skip(pb, size - 24);
193
194 return 0;
195 }
196
197 static int get_asf_string(AVIOContext *pb, int maxlen, char *buf, int buflen)
198 {
199 char *q = buf;
200 int ret = 0;
201 if (buflen <= 0)
202 return AVERROR(EINVAL);
203 while (ret + 1 < maxlen) {
204 uint8_t tmp;
205 uint32_t ch;
206 GET_UTF16(ch, (ret += 2) <= maxlen ? avio_rl16(pb) : 0, break;);
207 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)
208 }
209 *q = 0;
210
211 return ret;
212 }
213
214 static int asf_read_marker(AVFormatContext *s, const GUIDParseTable *g)
215 {
216 ASFContext *asf = s->priv_data;
217 AVIOContext *pb = s->pb;
218 uint64_t size = avio_rl64(pb);
219 int i, nb_markers, ret;
220 size_t len;
221 char name[1024];
222
223 avio_skip(pb, 8);
224 avio_skip(pb, 8); // skip reserved GUID
225 nb_markers = avio_rl32(pb);
226 avio_skip(pb, 2); // skip reserved field
227 len = avio_rl16(pb);
228 for (i = 0; i < len; i++)
229 avio_skip(pb, 1);
230
231 for (i = 0; i < nb_markers; i++) {
232 int64_t pts;
233
234 avio_skip(pb, 8);
235 pts = avio_rl64(pb);
236 pts -= asf->preroll * 10000;
237 avio_skip(pb, 2); // entry length
238 avio_skip(pb, 4); // send time
239 avio_skip(pb, 4); // flags
240 len = avio_rl32(pb);
241
242 if ((ret = avio_get_str16le(pb, len, name,
243 sizeof(name))) < len)
244 avio_skip(pb, len - ret);
245 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pts,
246 AV_NOPTS_VALUE, name);
247 }
248 align_position(pb, asf->offset, size);
249
250 return 0;
251 }
252
253 static int asf_read_metadata(AVFormatContext *s, const char *title, uint16_t len,
254 unsigned char *ch, uint16_t buflen)
255 {
256 AVIOContext *pb = s->pb;
257
258 avio_get_str16le(pb, len, ch, buflen);
259 if (av_dict_set(&s->metadata, title, ch, 0) < 0)
260 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
261
262 return 0;
263 }
264
265 static int asf_read_value(AVFormatContext *s, uint8_t *name, uint16_t name_len,
266 uint16_t val_len, int type, AVDictionary **met)
267 {
268 int ret;
269 uint8_t *value;
270 uint16_t buflen = 2 * val_len + 1;
271 AVIOContext *pb = s->pb;
272
273 value = av_malloc(buflen);
274 if (!value)
275 return AVERROR(ENOMEM);
276 if (type == ASF_UNICODE) {
277 // get_asf_string reads UTF-16 and converts it to UTF-8 which needs longer buffer
278 if ((ret = get_asf_string(pb, val_len, value, buflen)) < 0)
279 goto failed;
280 if (av_dict_set(met, name, value, 0) < 0)
281 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
282 } else {
283 char buf[256];
284 if (val_len > sizeof(buf))
285 return AVERROR_INVALIDDATA;
286 if ((ret = avio_read(pb, value, val_len)) < 0)
287 goto failed;
288 if (ret < 2 * val_len)
289 value[ret] = '\0';
290 else
291 value[2 * val_len - 1] = '\0';
292 snprintf(buf, sizeof(buf), "%s", value);
293 if (av_dict_set(met, name, buf, 0) < 0)
294 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
295 }
296 av_freep(&value);
297
298 return 0;
299
300 failed:
301 av_freep(&value);
302 return ret;
303 }
304
305 static int asf_read_generic_value(AVFormatContext *s, uint8_t *name, uint16_t name_len,
306 int type, AVDictionary **met)
307 {
308 AVIOContext *pb = s->pb;
309 uint64_t value;
310 char buf[32];
311
312 switch (type) {
313 case ASF_BOOL:
314 value = avio_rl32(pb);
315 break;
316 case ASF_DWORD:
317 value = avio_rl32(pb);
318 break;
319 case ASF_QWORD:
320 value = avio_rl64(pb);
321 break;
322 case ASF_WORD:
323 value = avio_rl16(pb);
324 break;
325 default:
326 av_freep(&name);
327 return AVERROR_INVALIDDATA;
328 }
329 snprintf(buf, sizeof(buf), "%"PRIu64, value);
330 if (av_dict_set(met, name, buf, 0) < 0)
331 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
332
333 return 0;
334 }
335
336 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
337 * but in reality this is only loosely similar */
338 static int asf_read_picture(AVFormatContext *s, int len)
339 {
340 ASFContext *asf = s->priv_data;
341 AVPacket pkt = { 0 };
342 const CodecMime *mime = ff_id3v2_mime_tags;
343 enum AVCodecID id = AV_CODEC_ID_NONE;
344 char mimetype[64];
345 uint8_t *desc = NULL;
346 AVStream *st = NULL;
347 int ret, type, picsize, desc_len;
348 ASFStream *asf_st;
349
350 /* type + picsize + mime + desc */
351 if (len < 1 + 4 + 2 + 2) {
352 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
353 return AVERROR_INVALIDDATA;
354 }
355
356 /* picture type */
357 type = avio_r8(s->pb);
358 len--;
359 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
360 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
361 type = 0;
362 }
363
364 /* picture data size */
365 picsize = avio_rl32(s->pb);
366 len -= 4;
367
368 /* picture MIME type */
369 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
370 while (mime->id != AV_CODEC_ID_NONE) {
371 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
372 id = mime->id;
373 break;
374 }
375 mime++;
376 }
377 if (id == AV_CODEC_ID_NONE) {
378 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
379 mimetype);
380 return 0;
381 }
382
383 if (picsize >= len) {
384 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
385 picsize, len);
386 return AVERROR_INVALIDDATA;
387 }
388
389 /* picture description */
390 desc_len = (len - picsize) * 2 + 1;
391 desc = av_malloc(desc_len);
392 if (!desc)
393 return AVERROR(ENOMEM);
394 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
395
396 ret = av_get_packet(s->pb, &pkt, picsize);
397 if (ret < 0)
398 goto fail;
399
400 st = avformat_new_stream(s, NULL);
401 if (!st) {
402 ret = AVERROR(ENOMEM);
403 goto fail;
404 }
405 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
406 asf_st = asf->asf_st[asf->nb_streams];
407 if (!asf_st)
408 return AVERROR(ENOMEM);
409
410 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
411 st->codec->codec_type = asf_st->type = AVMEDIA_TYPE_VIDEO;
412 st->codec->codec_id = id;
413 st->attached_pic = pkt;
414 st->attached_pic.stream_index = asf_st->index = st->index;
415 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
416
417 asf->nb_streams++;
418
419 if (*desc) {
420 if (av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL) < 0)
421 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
422 } else
423 av_freep(&desc);
424
425 if (av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0) < 0)
426 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
427
428 return 0;
429
430 fail:
431 av_freep(&desc);
432 av_free_packet(&pkt);
433 return ret;
434 }
435
436 static void get_id3_tag(AVFormatContext *s, int len)
437 {
438 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
439
440 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
441 if (id3v2_extra_meta)
442 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
443 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
444 }
445
446 static int process_metadata(AVFormatContext *s, uint8_t *name, uint16_t name_len,
447 uint16_t val_len, uint16_t type, AVDictionary **met)
448 {
449 int ret;
450 ff_asf_guid guid;
451
452 if (val_len) {
453 switch (type) {
454 case ASF_UNICODE:
455 asf_read_value(s, name, name_len, val_len, type, met);
456 break;
457 case ASF_BYTE_ARRAY:
458 if (!strcmp(name, "WM/Picture")) // handle cover art
459 asf_read_picture(s, val_len);
460 else if (!strcmp(name, "ID3")) // handle ID3 tag
461 get_id3_tag(s, val_len);
462 else
463 asf_read_value(s, name, name_len, val_len, type, met);
464 break;
465 case ASF_GUID:
466 ff_get_guid(s->pb, &guid);
467 break;
468 default:
469 if ((ret = asf_read_generic_value(s, name, name_len, type, met)) < 0)
470 return ret;
471 break;
472 }
473 }
474 av_freep(&name);
475
476 return 0;
477 }
478
479 static int asf_read_ext_content(AVFormatContext *s, const GUIDParseTable *g)
480 {
481 ASFContext *asf = s->priv_data;
482 AVIOContext *pb = s->pb;
483 uint64_t size = avio_rl64(pb);
484 uint16_t nb_desc = avio_rl16(pb);
485 int i, ret;
486
487 for (i = 0; i < nb_desc; i++) {
488 uint16_t name_len, type, val_len;
489 uint8_t *name = NULL;
490
491 name_len = avio_rl16(pb);
492 if (!name_len)
493 return AVERROR_INVALIDDATA;
494 name = av_malloc(name_len);
495 if (!name)
496 return AVERROR(ENOMEM);
497 avio_get_str16le(pb, name_len, name,
498 name_len);
499 type = avio_rl16(pb);
500 val_len = avio_rl16(pb);
501
502 if ((ret = process_metadata(s, name, name_len, val_len, type, &s->metadata)) < 0)
503 return ret;
504 }
505
506 align_position(pb, asf->offset, size);
507 return 0;
508 }
509
510 static AVStream *find_stream(AVFormatContext *s, uint16_t st_num)
511 {
512 AVStream *st = NULL;
513 ASFContext *asf = s->priv_data;
514 int i;
515
516 for (i = 0; i < asf->nb_streams; i++) {
517 if (asf->asf_st[i]->stream_index == st_num) {
518 st = s->streams[asf->asf_st[i]->index];
519 break;
520 }
521 }
522
523 return st;
524 }
525
526 static void asf_store_aspect_ratio(AVFormatContext *s, uint8_t st_num, uint8_t *name)
527 {
528 ASFContext *asf = s->priv_data;
529 AVIOContext *pb = s->pb;
530 uint16_t value = 0;
531
532 value = avio_rl16(pb);
533
534 if (st_num < ASF_MAX_STREAMS) {
535 if (!strcmp(name, "AspectRatioX"))
536 asf->asf_sd[st_num].aspect_ratio.num = value;
537 else
538 asf->asf_sd[st_num].aspect_ratio.den = value;
539 }
540 }
541
542 static int asf_read_metadata_obj(AVFormatContext *s, const GUIDParseTable *g)
543 {
544 ASFContext *asf = s->priv_data;
545 AVIOContext *pb = s->pb;
546 uint64_t size = avio_rl64(pb);
547 uint16_t nb_recs = avio_rl16(pb); // number of records in the Description Records list
548 int i, ret;
549
550 for (i = 0; i < nb_recs; i++) {
551 uint16_t name_len, buflen, type, val_len, st_num;
552 uint8_t *name = NULL;
553
554 avio_skip(pb, 2); // skip reserved field
555 st_num = avio_rl16(pb);
556 name_len = avio_rl16(pb);
557 buflen = 2 * name_len + 1;
558 if (!name_len)
559 break;
560 type = avio_rl16(pb);
561 val_len = avio_rl32(pb);
562 name = av_malloc(name_len);
563 if (!name)
564 return AVERROR(ENOMEM);
565 avio_get_str16le(pb, name_len, name,
566 buflen);
567
568 if (!strcmp(name, "AspectRatioX") || !strcmp(name, "AspectRatioY")) {
569 asf_store_aspect_ratio(s, st_num, name);
570 } else {
571 if (st_num < ASF_MAX_STREAMS) {
572 if ((ret = process_metadata(s, name, name_len, val_len, type,
573 &asf->asf_sd[st_num].asf_met)) < 0)
574 break;
575 }
576 }
577 }
578
579 align_position(pb, asf->offset, size);
580 return 0;
581 }
582
583 static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
584 {
585 ASFContext *asf = s->priv_data;
586 AVIOContext *pb = s->pb;
587 int i;
588 static const char *const titles[] =
589 { "Title", "Author", "Copyright", "Description", "Rate" };
590 uint16_t len[5], buflen[5] = { 0 };
591 uint8_t *ch;
592 uint64_t size = avio_rl64(pb);
593
594 for (i = 0; i < 5; i++) {
595 len[i] = avio_rl16(pb);
596 // utf8 string should be <= 2 * utf16 string, extra byte for the terminator
597 buflen[i] = 2 * len[i] + 1;
598 }
599
600 for (i = 0; i < 5; i++) {
601 ch = av_malloc(buflen[i]);
602 if (!ch)
603 return(AVERROR(ENOMEM));
604 asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
605 av_freep(&ch);
606 }
607 align_position(pb, asf->offset, size);
608
609 return 0;
610 }
611
612 static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
613 {
614 ASFContext *asf = s->priv_data;
615 AVIOContext *pb = s->pb;
616 uint64_t creation_time;
617
618 avio_rl64(pb); // read object size
619 avio_skip(pb, 16); // skip File ID
620 avio_skip(pb, 8); // skip File size
621 creation_time = avio_rl64(pb);
622 if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
623 struct tm tmbuf;
624 struct tm *tm;
625 char buf[64];
626
627 // creation date is in 100 ns units from 1 Jan 1601, conversion to s
628 creation_time /= 10000000;
629 // there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
630 creation_time -= 11644473600;
631 tm = gmtime_r(&creation_time, &tmbuf);
632 if (tm) {
633 if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
634 buf[0] = '\0';
635 } else
636 buf[0] = '\0';
637 if (buf[0]) {
638 if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
639 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
640 }
641 }
642 asf->nb_packets = avio_rl64(pb);
643 asf->duration = avio_rl64(pb) / 10000; // stream duration
644 avio_skip(pb, 8); // skip send duration
645 asf->preroll = avio_rl64(pb);
646 asf->duration -= asf->preroll;
647 asf->b_flags = avio_rl32(pb);
648 avio_skip(pb, 4); // skip minimal packet size
649 asf->packet_size = avio_rl32(pb);
650 avio_skip(pb, 4); // skip max_bitrate
651
652 return 0;
653 }
654
655 static int parse_video_info(AVIOContext *pb, AVStream *st)
656 {
657 uint16_t size;
658 unsigned int tag;
659
660 st->codec->width = avio_rl32(pb);
661 st->codec->height = avio_rl32(pb);
662 avio_skip(pb, 1); // skip reserved flags
663 size = avio_rl16(pb); // size of the Format Data
664 tag = ff_get_bmp_header(pb, st);
665 st->codec->codec_tag = tag;
666 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
667
668 if (size > BMP_HEADER_SIZE) {
669 int ret;
670 st->codec->extradata_size = size - BMP_HEADER_SIZE;
671 if (!(st->codec->extradata = av_malloc(st->codec->extradata_size +
672 FF_INPUT_BUFFER_PADDING_SIZE))) {
673 st->codec->extradata_size = 0;
674 return AVERROR(ENOMEM);
675 }
676 memset(st->codec->extradata + st->codec->extradata_size , 0,
677 FF_INPUT_BUFFER_PADDING_SIZE);
678 if ((ret = avio_read(pb, st->codec->extradata,
679 st->codec->extradata_size)) < 0)
680 return ret;
681 }
682 return 0;
683 }
684
685 static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
686 {
687 ASFContext *asf = s->priv_data;
688 AVIOContext *pb = s->pb;
689 uint64_t size;
690 uint32_t err_data_len, ts_data_len; // type specific data length
691 uint16_t flags;
692 ff_asf_guid stream_type;
693 enum AVMediaType type;
694 int i, ret;
695 uint8_t stream_index;
696 AVStream *st;
697 ASFStream *asf_st;
698
699 // ASF file must not contain more than 128 streams according to the specification
700 if (asf->nb_streams >= ASF_MAX_STREAMS)
701 return AVERROR_INVALIDDATA;
702
703 size = avio_rl64(pb);
704 ff_get_guid(pb, &stream_type);
705 if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
706 type = AVMEDIA_TYPE_AUDIO;
707 else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
708 type = AVMEDIA_TYPE_VIDEO;
709 else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
710 type = AVMEDIA_TYPE_VIDEO;
711 else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
712 type = AVMEDIA_TYPE_DATA;
713 else if (!ff_guidcmp(&stream_type,
714 &ff_asf_ext_stream_embed_stream_header))
715 type = AVMEDIA_TYPE_UNKNOWN;
716 else
717 return AVERROR_INVALIDDATA;
718
719 ff_get_guid(pb, &stream_type); // error correction type
720 avio_skip(pb, 8); // skip the time offset
721 ts_data_len = avio_rl32(pb);
722 err_data_len = avio_rl32(pb);
723 flags = avio_rl16(pb); // bit 15 - Encrypted Content
724
725 stream_index = flags & ASF_STREAM_NUM;
726 for (i = 0; i < asf->nb_streams; i++)
727 if (stream_index == asf->asf_st[i]->stream_index) {
728 av_log(s, AV_LOG_WARNING,
729 "Duplicate stream found, this stream will be ignored.\n");
730 align_position(pb, asf->offset, size);
731 return 0;
732 }
733
734 st = avformat_new_stream(s, NULL);
735 if (!st)
736 return AVERROR(ENOMEM);
737 avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
738 st->codec->codec_type = type;
739 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
740 if (!asf->asf_st[asf->nb_streams])
741 return AVERROR(ENOMEM);
742 asf_st = asf->asf_st[asf->nb_streams];
743 asf_st->stream_index = stream_index;
744 asf_st->index = st->index;
745 asf_st->indexed = 0;
746 st->id = flags & ASF_STREAM_NUM;
747 av_init_packet(&asf_st->pkt.avpkt);
748 asf_st->pkt.data_size = 0;
749 avio_skip(pb, 4); // skip reserved field
750
751 switch (type) {
752 case AVMEDIA_TYPE_AUDIO:
753 asf_st->type = AVMEDIA_TYPE_AUDIO;
754 if ((ret = ff_get_wav_header(pb, st->codec, ts_data_len)) < 0)
755 return ret;
756 break;
757 case AVMEDIA_TYPE_VIDEO:
758 asf_st->type = AVMEDIA_TYPE_VIDEO;
759 if ((ret = parse_video_info(pb, st)) < 0)
760 return ret;
761 break;
762 default:
763 avio_skip(pb, ts_data_len);
764 break;
765 }
766
767 if (err_data_len) {
768 if (type == AVMEDIA_TYPE_AUDIO) {
769 uint8_t span = avio_r8(pb);
770 if (span > 1) {
771 asf_st->span = span;
772 asf_st->virtual_pkt_len = avio_rl16(pb);
773 asf_st->virtual_chunk_len = avio_rl16(pb);
774 avio_skip(pb, err_data_len - 5);
775 } else
776 avio_skip(pb, err_data_len - 1);
777 } else
778 avio_skip(pb, err_data_len);
779 }
780
781 asf->nb_streams++;
782 align_position(pb, asf->offset, size);
783
784 return 0;
785 }
786
787 static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
788 {
789 // language abbr should contain at least 2 chars
790 if (rfc1766 && strlen(rfc1766) > 1) {
791 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
792 const char *iso6392 = av_convert_lang_to(primary_tag,
793 AV_LANG_ISO639_2_BIBL);
794 if (iso6392)
795 if (av_dict_set(met, "language", iso6392, 0) < 0)
796 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
797 }
798 }
799
800 static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
801 {
802 ASFContext *asf = s->priv_data;
803 AVIOContext *pb = s->pb;
804 AVStream *st = NULL;
805 ff_asf_guid guid;
806 uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
807 int i, ret;
808 uint32_t bitrate;
809 uint64_t start_time, end_time, time_per_frame;
810 uint64_t size = avio_rl64(pb);
811
812 start_time = avio_rl64(pb);
813 end_time = avio_rl64(pb);
814 bitrate = avio_rl32(pb);
815 avio_skip(pb, 28); // skip some unused values
816 st_num = avio_rl16(pb);
817 st_num &= ASF_STREAM_NUM;
818 lang_idx = avio_rl16(pb); // Stream Language ID Index
819 for (i = 0; i < asf->nb_streams; i++) {
820 if (st_num == asf->asf_st[i]->stream_index) {
821 st = s->streams[asf->asf_st[i]->index];
822 asf->asf_st[i]->lang_idx = lang_idx;
823 break;
824 }
825 }
826 time_per_frame = avio_rl64(pb); // average time per frame
827 if (st) {
828 st->start_time = start_time;
829 st->duration = end_time - start_time;
830 st->codec->bit_rate = bitrate;
831 st->avg_frame_rate.num = 10000000;
832 st->avg_frame_rate.den = time_per_frame;
833 }
834 nb_st_name = avio_rl16(pb);
835 nb_pay_exts = avio_rl16(pb);
836 for (i = 0; i < nb_st_name; i++) {
837 uint16_t len;
838
839 avio_rl16(pb); // Language ID Index
840 len = avio_rl16(pb);
841 avio_skip(pb, len);
842 }
843
844 for (i = 0; i < nb_pay_exts; i++) {
845 uint32_t len;
846 avio_skip(pb, 16); // Extension System ID
847 avio_skip(pb, 2); // Extension Data Size
848 len = avio_rl32(pb);
849 avio_skip(pb, len);
850 }
851
852 if ((ret = ff_get_guid(pb, &guid)) < 0) {
853 align_position(pb, asf->offset, size);
854
855 return 0;
856 }
857
858 g = find_guid(guid);
859 if (g && !(strcmp(g->name, "Stream Properties"))) {
860 if ((ret = g->read_object(s, g)) < 0)
861 return ret;
862 }
863
864 align_position(pb, asf->offset, size);
865 return 0;
866 }
867
868 static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
869 {
870 ASFContext *asf = s->priv_data;
871 AVIOContext *pb = s->pb;
872 int i, ret;
873 uint64_t size = avio_rl64(pb);
874 uint16_t nb_langs = avio_rl16(pb);
875
876 if (nb_langs < ASF_MAX_STREAMS) {
877 for (i = 0; i < nb_langs; i++) {
878 size_t len;
879 len = avio_r8(pb);
880 if (!len)
881 len = 6;
882 if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
883 sizeof(asf->asf_sd[i].langs))) < 0) {
884 return ret;
885 }
886 }
887 }
888
889 align_position(pb, asf->offset, size);
890 return 0;
891 }
892
893 // returns data object offset when reading this object for the first time
894 static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
895 {
896 ASFContext *asf = s->priv_data;
897 AVIOContext *pb = s->pb;
898 uint64_t size = asf->data_size = avio_rl64(pb);
899 int i;
900
901 if (!asf->data_reached && pb->seekable) {
902 asf->data_reached = 1;
903 asf->data_offset = asf->offset;
904 }
905
906 for (i = 0; i < asf->nb_streams; i++) {
907 if (!(asf->b_flags & ASF_FLAG_BROADCAST))
908 s->streams[i]->duration = asf->duration;
909 }
910 asf->nb_mult_left = 0;
911 asf->sub_left = 0;
912 asf->state = PARSE_PACKET_HEADER;
913 asf->return_subpayload = 0;
914 asf->packet_size_internal = 0;
915 avio_skip(pb, 16); // skip File ID
916 size = avio_rl64(pb); // Total Data Packets
917 if (size != asf->nb_packets)
918 av_log(s, AV_LOG_WARNING,
919 "Number of Packets from File Properties Object is not equal to Total"
920 "Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
921 size, asf->nb_packets);
922 avio_skip(pb, 2); // skip reserved field
923 asf->first_packet_offset = avio_tell(pb);
924 align_position(pb, asf->offset, asf->data_size);
925
926 return 0;
927 }
928
929 static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
930 {
931 ASFContext *asf = s->priv_data;
932 AVIOContext *pb = s->pb;
933 AVStream *st = NULL;
934 uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
935 uint32_t pkt_num, nb_entries;
936 int32_t prev_pkt_num = -1;
937 int i;
938 uint64_t size = avio_rl64(pb);
939
940 // simple index objects should be ordered by stream number, this loop tries to find
941 // the first not indexed video stream
942 for (i = 0; i < asf->nb_streams; i++) {
943 if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
944 asf->asf_st[i]->indexed = 1;
945 st = s->streams[asf->asf_st[i]->index];
946 break;
947 }
948 }
949 if (!st) {
950 avio_skip(pb, size - 24); // if there's no video stream, skip index object
951 return 0;
952 }
953 avio_skip(pb, 16); // skip File ID
954 interval = avio_rl64(pb);
955 avio_skip(pb, 4);
956 nb_entries = avio_rl32(pb);
957 for (i = 0; i < nb_entries; i++) {
958 pkt_num = avio_rl32(pb);
959 avio_skip(pb, 2);
960 if (prev_pkt_num != pkt_num) {
961 av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
962 pkt_num, av_rescale(interval, i, 10000),
963 asf->packet_size, 0, AVINDEX_KEYFRAME);
964 prev_pkt_num = pkt_num;
965 }
966 }
967 asf->is_simple_index = 1;
968 align_position(pb, asf->offset, size);
969
970 return 0;
971 }
972
973 static const GUIDParseTable gdef[] = {
974 { "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
975 { "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
976 { "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
977 { "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
978 { "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
979 { "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
980 { "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
981 { "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
982 { "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
983 { "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
984 { "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
985 { "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
986 { "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
987 { "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
988 { "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
989 { "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
990 { "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
991 { "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
992 { "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
993 { "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
994 { "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
995 { "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
996 { "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
997 { "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
998 { "Extended Stream Properties", { 0x14, 0xE6, 0xA5, 0xCB, 0xC6, 0x72, 0x43, 0x32, 0x83, 0x99, 0xA9, 0x69, 0x52, 0x06, 0x5B, 0x5A }, asf_read_ext_stream_properties, 1 },
999 { "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
1000 { "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
1001 { "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
1002 { "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1003 { "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
1004 { "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
1005 { "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
1006 { "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1007 { "Content Encryption System Windows Media DRM Network Devices",
1008 { 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
1009 { "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1010 { "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1011 { "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1012 { "Bandwith Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1013 { "Bandwith Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1014 { "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
1015 { "Payload Extension System File Name", { 0xE1, 0x65, 0xEC, 0x0E, 0x19, 0xED, 0x45, 0xD7, 0xB4, 0xA7, 0x25, 0xCB, 0xD1, 0xE2, 0x8E, 0x9B }, asf_read_unknown, 1 },
1016 { "Payload Extension System Content Type", { 0xD5, 0x90, 0xDC, 0x20, 0x07, 0xBC, 0x43, 0x6C, 0x9C, 0xF7, 0xF3, 0xBB, 0xFB, 0xF1, 0xA4, 0xDC }, asf_read_unknown, 1 },
1017 { "Payload Extension System Pixel Aspect Ratio", { 0x1, 0x1E, 0xE5, 0x54, 0xF9, 0xEA, 0x4B, 0xC8, 0x82, 0x1A, 0x37, 0x6B, 0x74, 0xE4, 0xC4, 0xB8 }, asf_read_unknown, 1 },
1018 { "Payload Extension System Sample Duration", { 0xC6, 0xBD, 0x94, 0x50, 0x86, 0x7F, 0x49, 0x07, 0x83, 0xA3, 0xC7, 0x79, 0x21, 0xB7, 0x33, 0xAD }, asf_read_unknown, 1 },
1019 { "Payload Extension System Encryption Sample ID", { 0x66, 0x98, 0xB8, 0x4E, 0x0A, 0xFA, 0x43, 0x30, 0xAE, 0xB2, 0x1C, 0x0A, 0x98, 0xD7, 0xA4, 0x4D }, asf_read_unknown, 1 },
1020 { "Payload Extension System Degradable JPEG", { 0x00, 0xE1, 0xAF, 0x06, 0x7B, 0xEC, 0x11, 0xD1, 0xA5, 0x82, 0x00, 0xC0, 0x4F, 0xC2, 0x9C, 0xFB }, asf_read_unknown, 1 },
1021 };
1022
1023 #define READ_LEN(flag, name, len) \
1024 do { \
1025 if ((flag) == name ## IS_BYTE) \
1026 len = avio_r8(pb); \
1027 else if ((flag) == name ## IS_WORD) \
1028 len = avio_rl16(pb); \
1029 else if ((flag) == name ## IS_DWORD) \
1030 len = avio_rl32(pb); \
1031 else \
1032 len = 0; \
1033 } while(0)
1034
1035 static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
1036 {
1037 ASFContext *asf = s->priv_data;
1038 AVIOContext *pb = s->pb;
1039 uint8_t sub_len;
1040 int ret, i;
1041
1042 if (is_header) {
1043 asf->dts_delta = avio_r8(pb);
1044 if (asf->nb_mult_left) {
1045 asf->mult_sub_len = avio_rl16(pb); // total
1046 }
1047 asf->sub_header_offset = avio_tell(pb);
1048 asf->nb_sub = 0;
1049 asf->sub_left = 1;
1050 }
1051 sub_len = avio_r8(pb);
1052 if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
1053 return ret;
1054 for (i = 0; i < asf->nb_streams; i++) {
1055 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1056 pkt->stream_index = asf->asf_st[i]->index;
1057 break;
1058 }
1059 }
1060 asf->return_subpayload = 1;
1061 if (!sub_len)
1062 asf->return_subpayload = 0;
1063
1064 if (sub_len)
1065 asf->nb_sub++;
1066 pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
1067 if (asf->nb_mult_left && (avio_tell(pb) >=
1068 (asf->sub_header_offset + asf->mult_sub_len))) {
1069 asf->sub_left = 0;
1070 asf->nb_mult_left--;
1071 }
1072 if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
1073 asf->sub_left = 0;
1074 if (!asf->nb_mult_left) {
1075 avio_skip(pb, asf->pad_len);
1076 if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
1077 if (!asf->packet_size)
1078 return AVERROR_INVALIDDATA;
1079 av_log(s, AV_LOG_WARNING,
1080 "Position %"PRId64" wrong, should be %"PRId64"\n",
1081 avio_tell(pb), asf->packet_offset + asf->packet_size);
1082 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1083 }
1084 }
1085 }
1086
1087 return 0;
1088 }
1089
1090 static void reset_packet(ASFPacket *asf_pkt)
1091 {
1092 asf_pkt->size_left = 0;
1093 asf_pkt->data_size = 0;
1094 asf_pkt->duration = 0;
1095 asf_pkt->flags = 0;
1096 asf_pkt->dts = 0;
1097 asf_pkt->duration = 0;
1098 av_free_packet(&asf_pkt->avpkt);
1099 av_init_packet(&asf_pkt->avpkt);
1100 }
1101
1102 static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
1103 ASFPacket *asf_pkt)
1104 {
1105 ASFContext *asf = s->priv_data;
1106 AVIOContext *pb = s->pb;
1107 uint16_t pay_len;
1108 unsigned char *p;
1109 int ret;
1110 int skip = 0;
1111
1112 // if replicated lenght is 1, subpayloads are present
1113 if (asf->rep_data_len == 1) {
1114 asf->sub_left = 1;
1115 asf->state = READ_MULTI_SUB;
1116 pkt->flags = asf_pkt->flags;
1117 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1118 return ret;
1119 } else {
1120 if (!asf_pkt->data_size) {
1121 asf_pkt->data_size = asf_pkt->size_left = avio_rl32(pb); // read media object size
1122 if (asf_pkt->data_size <= 0)
1123 return AVERROR_EOF;
1124 if ((ret = av_new_packet(&asf_pkt->avpkt, asf_pkt->data_size)) < 0)
1125 return ret;
1126 } else
1127 avio_skip(pb, 4); // reading of media object size is already done
1128 asf_pkt->dts = avio_rl32(pb); // read presentation time
1129 if ((asf->rep_data_len - 8) > 0)
1130 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1131 pay_len = avio_rl16(pb); // payload length should be WORD
1132 if (pay_len > asf->packet_size) {
1133 av_log(s, AV_LOG_ERROR,
1134 "Error: invalid data packet size, pay_len %"PRIu16", "
1135 "asf->packet_size %"PRIu32", offset %"PRId64".\n",
1136 pay_len, asf->packet_size, avio_tell(pb));
1137 return AVERROR_INVALIDDATA;
1138 }
1139 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1140 if (pay_len > asf_pkt->size_left) {
1141 av_log(s, AV_LOG_ERROR,
1142 "Error: invalid buffer size, pay_len %d, data size left %d.\n",
1143 pay_len, asf_pkt->size_left);
1144 skip = pay_len - asf_pkt->size_left;
1145 pay_len = asf_pkt->size_left;
1146 }
1147 if ((ret = avio_read(pb, p, pay_len)) < 0)
1148 return ret;
1149 if (s->key && s->keylen == 20)
1150 ff_asfcrypt_dec(s->key, p, ret);
1151 avio_skip(pb, skip);
1152 asf_pkt->size_left -= pay_len;
1153 asf->nb_mult_left--;
1154 }
1155
1156 return 0;
1157 }
1158
1159 static int asf_read_single_payload(AVFormatContext *s, AVPacket *pkt,
1160 ASFPacket *asf_pkt)
1161 {
1162 ASFContext *asf = s->priv_data;
1163 AVIOContext *pb = s->pb;
1164 int64_t offset;
1165 uint64_t size;
1166 unsigned char *p;
1167 int ret;
1168
1169 if (!asf_pkt->data_size) {
1170 asf_pkt->data_size = asf_pkt->size_left = avio_rl32(pb); // read media object size
1171 if (asf_pkt->data_size <= 0)
1172 return AVERROR_EOF;
1173 if ((ret = av_new_packet(&asf_pkt->avpkt, asf_pkt->data_size)) < 0)
1174 return ret;
1175 } else
1176 avio_skip(pb, 4); // skip media object size
1177 asf_pkt->dts = avio_rl32(pb); // read presentation time
1178 if ((asf->rep_data_len - 8) > 0)
1179 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1180 offset = avio_tell(pb);
1181
1182 // size of the payload - size of the packet without header and padding
1183 if (asf->packet_size_internal)
1184 size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
1185 else
1186 size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
1187 if (size > asf->packet_size) {
1188 av_log(s, AV_LOG_ERROR,
1189 "Error: invalid data packet size, offset %"PRId64".\n",
1190 avio_tell(pb));
1191 return AVERROR_INVALIDDATA;
1192 }
1193 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1194 if (size > asf_pkt->size_left)
1195 return AVERROR_INVALIDDATA;
1196 if (asf_pkt->size_left > size)
1197 asf_pkt->size_left -= size;
1198 else
1199 asf_pkt->size_left = 0;
1200 if ((ret = avio_read(pb, p, size)) < 0)
1201 return ret;
1202 if (s->key && s->keylen == 20)
1203 ff_asfcrypt_dec(s->key, p, ret);
1204 if (asf->packet_size_internal)
1205 avio_skip(pb, asf->packet_size - asf->packet_size_internal);
1206 avio_skip(pb, asf->pad_len); // skip padding
1207
1208 return 0;
1209 }
1210
1211 static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
1212 {
1213 ASFContext *asf = s->priv_data;
1214 AVIOContext *pb = s->pb;
1215 int ret, i;
1216 ASFPacket *asf_pkt = NULL;
1217
1218 if (!asf->sub_left) {
1219 uint32_t off_len, media_len;
1220 uint8_t stream_num;
1221
1222 stream_num = avio_r8(pb);
1223 asf->stream_index = stream_num & ASF_STREAM_NUM;
1224 for (i = 0; i < asf->nb_streams; i++) {
1225 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1226 asf_pkt = &asf->asf_st[i]->pkt;
1227 asf_pkt->stream_index = asf->asf_st[i]->index;
1228 asf_pkt->dts = asf->dts;
1229 break;
1230 }
1231 }
1232 if (!asf_pkt)
1233 return AVERROR_INVALIDDATA;
1234 if (stream_num >> 7)
1235 asf_pkt->flags |= AV_PKT_FLAG_KEY;
1236 READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
1237 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
1238 READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
1239 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
1240 READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
1241 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
1242 if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
1243 av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
1244 reset_packet(asf_pkt);
1245 }
1246 asf_pkt->frame_num = media_len;
1247 asf->sub_dts = off_len;
1248 if (asf->nb_mult_left) {
1249 if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
1250 return ret;
1251 } else if (asf->rep_data_len == 1) {
1252 asf->sub_left = 1;
1253 asf->state = READ_SINGLE;
1254 pkt->flags = asf_pkt->flags;
1255 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1256 return ret;
1257 } else {
1258 if ((ret = asf_read_single_payload(s, pkt, asf_pkt)) < 0)
1259 return ret;
1260 }
1261 } else {
1262 for (i = 0; i <= asf->nb_streams; i++) {
1263 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1264 asf_pkt = &asf->asf_st[i]->pkt;
1265 break;
1266 }
1267 }
1268 if (!asf_pkt)
1269 return AVERROR_INVALIDDATA;
1270 pkt->flags = asf_pkt->flags;
1271 pkt->dts = asf_pkt->dts;
1272 pkt->stream_index = asf->asf_st[i]->index;
1273 if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
1274 return ret;
1275 }
1276
1277 return 0;
1278 }
1279
1280 static int asf_read_packet_header(AVFormatContext *s)
1281 {
1282 ASFContext *asf = s->priv_data;
1283 AVIOContext *pb = s->pb;
1284 uint64_t size;
1285 uint32_t av_unused seq;
1286 unsigned char error_flags, len_flags, pay_flags;
1287
1288 asf->packet_offset = avio_tell(pb);
1289 error_flags = avio_r8(pb); // read Error Correction Flags
1290 if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT)
1291 if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
1292 size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
1293 avio_skip(pb, size);
1294 }
1295 len_flags = avio_r8(pb);
1296 asf->prop_flags = avio_r8(pb);
1297 READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
1298 ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
1299 READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
1300 ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
1301 READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
1302 ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
1303 asf->send_time = avio_rl32(pb); // send time
1304 avio_skip(pb, 2); // skip duration
1305 if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
1306 pay_flags = avio_r8(pb);
1307 asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
1308 }
1309
1310 return 0;
1311 }
1312
1313 static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
1314 {
1315 ASFContext *asf = s->priv_data;
1316 ASFStream *asf_st = asf->asf_st[st_num];
1317 unsigned char *p = asf_pkt->avpkt.data;
1318 uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
1319 uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
1320 int nchunks = pkt_len / chunk_len;
1321 AVPacket pkt;
1322 int pos = 0, j, l, ret;
1323
1324
1325 if ((ret = av_new_packet(&pkt, asf_pkt->data_size)) < 0)
1326 return ret;
1327
1328 while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
1329 if (pos >= asf_pkt->data_size) {
1330 break;
1331 }
1332 for (l = 0; l < pkt_len; l++) {
1333 if (pos >= asf_pkt->data_size) {
1334 break;
1335 }
1336 for (j = 0; j < asf_st->span; j++) {
1337 if ((pos + chunk_len) >= asf_pkt->data_size)
1338 break;
1339 memcpy(pkt.data + pos,
1340 p + (j * nchunks + l) * chunk_len,
1341 chunk_len);
1342 pos += chunk_len;
1343 }
1344 }
1345 p += asf_st->span * pkt_len;
1346 if (p > asf_pkt->avpkt.data + asf_pkt->data_size)
1347 break;
1348 }
1349 av_free_packet(&asf_pkt->avpkt);
1350 asf_pkt->avpkt = pkt;
1351
1352 return 0;
1353 }
1354
1355 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1356 {
1357 ASFContext *asf = s->priv_data;
1358 AVIOContext *pb = s->pb;
1359 int ret, i;
1360
1361 if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
1362 !(asf->b_flags & ASF_FLAG_BROADCAST))
1363 return AVERROR_EOF;
1364 while (!pb->eof_reached) {
1365 if (asf->state == PARSE_PACKET_HEADER) {
1366 asf_read_packet_header(s);
1367 if (!asf->nb_mult_left)
1368 asf->state = READ_SINGLE;
1369 else
1370 asf->state = READ_MULTI;
1371 }
1372 if ((ret = asf_read_payload(s, pkt)) < 0)
1373 return ret;
1374 switch (asf->state) {
1375 case READ_SINGLE:
1376 if (!asf->sub_left)
1377 asf->state = PARSE_PACKET_HEADER;
1378 break;
1379 case READ_MULTI_SUB:
1380 if (!asf->sub_left && !asf->nb_mult_left) {
1381 asf->state = PARSE_PACKET_HEADER;
1382 if (!asf->return_subpayload)
1383 avio_skip(pb, asf->pad_len); // skip padding
1384 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1385 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1386 } else if (!asf->sub_left)
1387 asf->state = READ_MULTI;
1388 break;
1389 case READ_MULTI:
1390 if (!asf->nb_mult_left) {
1391 asf->state = PARSE_PACKET_HEADER;
1392 if (!asf->return_subpayload) {
1393 avio_skip(pb, asf->pad_len); // skip padding
1394 }
1395 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1396 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1397 }
1398 break;
1399 }
1400 if (asf->return_subpayload) {
1401 asf->return_subpayload = 0;
1402 return 0;
1403 }
1404 for (i = 0; i < s->nb_streams; i++) {
1405 ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
1406 if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
1407 if (asf->asf_st[i]->span > 1 &&
1408 asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
1409 if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
1410 return ret;
1411 av_packet_move_ref(pkt, &asf_pkt->avpkt);
1412 pkt->stream_index = asf->asf_st[i]->index;
1413 pkt->flags = asf_pkt->flags;
1414 pkt->dts = asf_pkt->dts - asf->preroll;
1415 asf_pkt->data_size = 0;
1416 asf_pkt->frame_num = 0;
1417 return 0;
1418 }
1419 }
1420 }
1421
1422 if (pb->eof_reached)
1423 return AVERROR_EOF;
1424
1425 return 0;
1426 }
1427
1428 static int asf_read_close(AVFormatContext *s)
1429 {
1430 ASFContext *asf = s->priv_data;
1431 int i;
1432
1433 for (i = 0; i < asf->nb_streams; i++) {
1434 av_free_packet(&asf->asf_st[i]->pkt.avpkt);
1435 av_freep(&asf->asf_st[i]);
1436 av_dict_free(&asf->asf_sd[i].asf_met);
1437 }
1438
1439 return 0;
1440 }
1441
1442 static void reset_packet_state(AVFormatContext *s)
1443 {
1444 ASFContext *asf = s->priv_data;
1445 int i;
1446
1447 asf->state = PARSE_PACKET_HEADER;
1448 asf->offset = 0;
1449 asf->return_subpayload = 0;
1450 asf->sub_left = 0;
1451 asf->sub_header_offset = 0;
1452 asf->packet_offset = asf->first_packet_offset;
1453 asf->pad_len = 0;
1454 asf->rep_data_len = 0;
1455 asf->dts_delta = 0;
1456 asf->mult_sub_len = 0;
1457 asf->nb_mult_left = 0;
1458 asf->nb_sub = 0;
1459 asf->prop_flags = 0;
1460 asf->sub_dts = 0;
1461 asf->dts = 0;
1462 for (i = 0; i < asf->nb_streams; i++) {
1463 ASFPacket *pkt = &asf->asf_st[i]->pkt;
1464 pkt->size_left = 0;
1465 pkt->data_size = 0;
1466 pkt->duration = 0;
1467 pkt->flags = 0;
1468 pkt->dts = 0;
1469 pkt->duration = 0;
1470 av_free_packet(&pkt->avpkt);
1471 av_init_packet(&pkt->avpkt);
1472 }
1473 }
1474
1475 /*
1476 * Find a timestamp for the requested position within the payload
1477 * where the pos (position) is the offset inside the Data Object.
1478 * When position is not on the packet boundary, asf_read_timestamp tries
1479 * to find the closest packet offset after this position. If this packet
1480 * is a key frame, this packet timestamp is read and an index entry is created
1481 * for the packet. If this packet belongs to the requested stream,
1482 * asf_read_timestamp upgrades pos to the packet beginning offset and
1483 * returns this packet's dts. So returned dts is the dts of the first key frame with
1484 * matching stream number after given position.
1485 */
1486 static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
1487 int64_t *pos, int64_t pos_limit)
1488 {
1489 ASFContext *asf = s->priv_data;
1490 int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
1491 AVPacket pkt;
1492 int n;
1493
1494 data_end = asf->data_offset + asf->data_size;
1495
1496 n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
1497 asf->packet_size;
1498 n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
1499 pkt_pos = asf->first_packet_offset + n * asf->packet_size;
1500
1501 avio_seek(s->pb, pkt_pos, SEEK_SET);
1502 pkt_offset = pkt_pos;
1503
1504 reset_packet_state(s);
1505 while (avio_tell(s->pb) < data_end) {
1506
1507 int i, ret, st_found;
1508
1509 av_init_packet(&pkt);
1510 pkt_offset = avio_tell(s->pb);
1511 if ((ret = asf_read_packet(s, &pkt)) < 0) {
1512 dts = AV_NOPTS_VALUE;
1513 return ret;
1514 }
1515 // ASFPacket may contain fragments of packets belonging to different streams,
1516 // pkt_offset is the offset of the first fragment within it.
1517 if ((pkt_offset >= (pkt_pos + asf->packet_size)))
1518 pkt_pos += asf->packet_size;
1519 for (i = 0; i < asf->nb_streams; i++) {
1520 ASFStream *st = asf->asf_st[i];
1521
1522 st_found = 0;
1523 if (pkt.flags & AV_PKT_FLAG_KEY) {
1524 dts = pkt.dts;
1525 if (dts) {
1526 av_add_index_entry(s->streams[pkt.stream_index], pkt_pos,
1527 dts, pkt.size, 0, AVINDEX_KEYFRAME);
1528 if (stream_index == st->index) {
1529 st_found = 1;
1530 break;
1531 }
1532 }
1533 }
1534 }
1535 if (st_found)
1536 break;
1537 av_free_packet(&pkt);
1538 }
1539 *pos = pkt_pos;
1540
1541 av_free_packet(&pkt);
1542 return dts;
1543 }
1544
1545 static int asf_read_seek(AVFormatContext *s, int stream_index,
1546 int64_t timestamp, int flags)
1547 {
1548 ASFContext *asf = s->priv_data;
1549 int idx, ret;
1550
1551 if (s->streams[stream_index]->nb_index_entries && asf->is_simple_index) {
1552 idx = av_index_search_timestamp(s->streams[stream_index], timestamp, flags);
1553 if (idx < 0 || idx >= s->streams[stream_index]->nb_index_entries)
1554 return AVERROR_INVALIDDATA;
1555 avio_seek(s->pb, s->streams[stream_index]->index_entries[idx].pos, SEEK_SET);
1556 } else {
1557 if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
1558 return ret;
1559
1560 // asf_read_timestamp is called inside ff_seek_frame_binary and leaves state dirty,
1561 // so reset_packet_state have to be called after it.
1562 reset_packet_state(s);
1563 }
1564
1565 return 0;
1566 }
1567
1568 static const GUIDParseTable *find_guid(ff_asf_guid guid)
1569 {
1570 int j, ret;
1571 const GUIDParseTable *g;
1572
1573 swap_guid(guid);
1574 g = gdef;
1575 for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
1576 if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
1577 return g;
1578 g++;
1579 }
1580
1581 return NULL;
1582 }
1583
1584 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
1585 {
1586 ASFContext *asf = s->priv_data;
1587 AVIOContext *pb = s->pb;
1588 const GUIDParseTable *g = NULL;
1589 ff_asf_guid guid;
1590 int ret;
1591
1592 while (avio_tell(pb) <= offset + size) {
1593 asf->offset = avio_tell(pb);
1594 if ((ret = ff_get_guid(pb, &guid)) < 0)
1595 return ret;
1596 g = find_guid(guid);
1597 if (g) {
1598 if ((ret = g->read_object(s, g)) < 0)
1599 return ret;
1600 } else {
1601 GUIDParseTable g2;
1602
1603 g2.name = "Unknown";
1604 g2.is_subobject = 1;
1605 asf_read_unknown(s, &g2);
1606 }
1607 }
1608
1609 return 0;
1610 }
1611
1612 static int asf_read_header(AVFormatContext *s)
1613 {
1614 ASFContext *asf = s->priv_data;
1615 AVIOContext *pb = s->pb;
1616 const GUIDParseTable *g = NULL;
1617 ff_asf_guid guid;
1618 int i, ret;
1619 uint64_t size;
1620
1621 asf->preroll = 0;
1622 asf->is_simple_index = 0;
1623 ff_get_guid(pb, &guid);
1624 if (ff_guidcmp(&guid, &ff_asf_header))
1625 return AVERROR_INVALIDDATA;
1626 avio_skip(pb, 8); // skip header object size
1627 avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
1628 asf->data_reached = 0;
1629
1630 /* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
1631 * for the first time,
1632 * Index object is processed and got eof and then seeking back to the Data is performed.
1633 */
1634 while (1) {
1635 // for the cases when object size is invalid
1636 if (avio_tell(pb) == asf->offset) {
1637 if (asf->data_reached)
1638 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1639 break;
1640 }
1641 asf->offset = avio_tell(pb);
1642 if ((ret = ff_get_guid(pb, &guid)) < 0) {
1643 if (ret == AVERROR_EOF && asf->data_reached) {
1644 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1645 break;
1646 } else
1647 return ret;
1648 }
1649 g = find_guid(guid);
1650 if (g) {
1651 asf->unknown_offset = asf->offset;
1652 asf->is_header = 1;
1653 if ((ret = g->read_object(s, g)) < 0)
1654 return ret;
1655 } else {
1656 size = avio_rl64(pb);
1657 align_position(pb, asf->offset, size);
1658 }
1659 if (asf->data_reached && !pb->seekable)
1660 break;
1661 }
1662
1663 for (i = 0; i < asf->nb_streams; i++) {
1664 const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
1665 AVStream *st = s->streams[asf->asf_st[i]->index];
1666 set_language(s, rfc1766, &st->metadata);
1667 }
1668
1669 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1670 AVStream *st = NULL;
1671
1672 st = find_stream(s, i);
1673 if (st) {
1674 av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
1675 if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
1676 st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
1677 st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
1678 }
1679 }
1680 }
1681
1682 return 0;
1683 }
1684
1685 AVInputFormat ff_asf_demuxer = {
1686 .name = "asf",
1687 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1688 .priv_data_size = sizeof(ASFContext),
1689 .read_probe = asf_probe,
1690 .read_header = asf_read_header,
1691 .read_packet = asf_read_packet,
1692 .read_close = asf_read_close,
1693 .read_timestamp = asf_read_timestamp,
1694 .read_seek = asf_read_seek,
1695 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1696 };
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