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asfdec: prevent possible memory leak in the asf_read_metadata_obj
[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 } else
576 av_freep(&name);
577 }
578 }
579
580 align_position(pb, asf->offset, size);
581 return 0;
582 }
583
584 static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
585 {
586 ASFContext *asf = s->priv_data;
587 AVIOContext *pb = s->pb;
588 int i;
589 static const char *const titles[] =
590 { "Title", "Author", "Copyright", "Description", "Rate" };
591 uint16_t len[5], buflen[5] = { 0 };
592 uint8_t *ch;
593 uint64_t size = avio_rl64(pb);
594
595 for (i = 0; i < 5; i++) {
596 len[i] = avio_rl16(pb);
597 // utf8 string should be <= 2 * utf16 string, extra byte for the terminator
598 buflen[i] = 2 * len[i] + 1;
599 }
600
601 for (i = 0; i < 5; i++) {
602 ch = av_malloc(buflen[i]);
603 if (!ch)
604 return(AVERROR(ENOMEM));
605 asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
606 av_freep(&ch);
607 }
608 align_position(pb, asf->offset, size);
609
610 return 0;
611 }
612
613 static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
614 {
615 ASFContext *asf = s->priv_data;
616 AVIOContext *pb = s->pb;
617 uint64_t creation_time;
618
619 avio_rl64(pb); // read object size
620 avio_skip(pb, 16); // skip File ID
621 avio_skip(pb, 8); // skip File size
622 creation_time = avio_rl64(pb);
623 if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
624 struct tm tmbuf;
625 struct tm *tm;
626 char buf[64];
627
628 // creation date is in 100 ns units from 1 Jan 1601, conversion to s
629 creation_time /= 10000000;
630 // there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
631 creation_time -= 11644473600;
632 tm = gmtime_r(&creation_time, &tmbuf);
633 if (tm) {
634 if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
635 buf[0] = '\0';
636 } else
637 buf[0] = '\0';
638 if (buf[0]) {
639 if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
640 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
641 }
642 }
643 asf->nb_packets = avio_rl64(pb);
644 asf->duration = avio_rl64(pb) / 10000; // stream duration
645 avio_skip(pb, 8); // skip send duration
646 asf->preroll = avio_rl64(pb);
647 asf->duration -= asf->preroll;
648 asf->b_flags = avio_rl32(pb);
649 avio_skip(pb, 4); // skip minimal packet size
650 asf->packet_size = avio_rl32(pb);
651 avio_skip(pb, 4); // skip max_bitrate
652
653 return 0;
654 }
655
656 static int parse_video_info(AVIOContext *pb, AVStream *st)
657 {
658 uint16_t size;
659 unsigned int tag;
660
661 st->codec->width = avio_rl32(pb);
662 st->codec->height = avio_rl32(pb);
663 avio_skip(pb, 1); // skip reserved flags
664 size = avio_rl16(pb); // size of the Format Data
665 tag = ff_get_bmp_header(pb, st);
666 st->codec->codec_tag = tag;
667 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
668
669 if (size > BMP_HEADER_SIZE) {
670 int ret;
671 st->codec->extradata_size = size - BMP_HEADER_SIZE;
672 if (!(st->codec->extradata = av_malloc(st->codec->extradata_size +
673 FF_INPUT_BUFFER_PADDING_SIZE))) {
674 st->codec->extradata_size = 0;
675 return AVERROR(ENOMEM);
676 }
677 memset(st->codec->extradata + st->codec->extradata_size , 0,
678 FF_INPUT_BUFFER_PADDING_SIZE);
679 if ((ret = avio_read(pb, st->codec->extradata,
680 st->codec->extradata_size)) < 0)
681 return ret;
682 }
683 return 0;
684 }
685
686 static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
687 {
688 ASFContext *asf = s->priv_data;
689 AVIOContext *pb = s->pb;
690 uint64_t size;
691 uint32_t err_data_len, ts_data_len; // type specific data length
692 uint16_t flags;
693 ff_asf_guid stream_type;
694 enum AVMediaType type;
695 int i, ret;
696 uint8_t stream_index;
697 AVStream *st;
698 ASFStream *asf_st;
699
700 // ASF file must not contain more than 128 streams according to the specification
701 if (asf->nb_streams >= ASF_MAX_STREAMS)
702 return AVERROR_INVALIDDATA;
703
704 size = avio_rl64(pb);
705 ff_get_guid(pb, &stream_type);
706 if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
707 type = AVMEDIA_TYPE_AUDIO;
708 else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
709 type = AVMEDIA_TYPE_VIDEO;
710 else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
711 type = AVMEDIA_TYPE_VIDEO;
712 else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
713 type = AVMEDIA_TYPE_DATA;
714 else if (!ff_guidcmp(&stream_type,
715 &ff_asf_ext_stream_embed_stream_header))
716 type = AVMEDIA_TYPE_UNKNOWN;
717 else
718 return AVERROR_INVALIDDATA;
719
720 ff_get_guid(pb, &stream_type); // error correction type
721 avio_skip(pb, 8); // skip the time offset
722 ts_data_len = avio_rl32(pb);
723 err_data_len = avio_rl32(pb);
724 flags = avio_rl16(pb); // bit 15 - Encrypted Content
725
726 stream_index = flags & ASF_STREAM_NUM;
727 for (i = 0; i < asf->nb_streams; i++)
728 if (stream_index == asf->asf_st[i]->stream_index) {
729 av_log(s, AV_LOG_WARNING,
730 "Duplicate stream found, this stream will be ignored.\n");
731 align_position(pb, asf->offset, size);
732 return 0;
733 }
734
735 st = avformat_new_stream(s, NULL);
736 if (!st)
737 return AVERROR(ENOMEM);
738 avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
739 st->codec->codec_type = type;
740 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
741 if (!asf->asf_st[asf->nb_streams])
742 return AVERROR(ENOMEM);
743 asf_st = asf->asf_st[asf->nb_streams];
744 asf_st->stream_index = stream_index;
745 asf_st->index = st->index;
746 asf_st->indexed = 0;
747 st->id = flags & ASF_STREAM_NUM;
748 av_init_packet(&asf_st->pkt.avpkt);
749 asf_st->pkt.data_size = 0;
750 avio_skip(pb, 4); // skip reserved field
751
752 switch (type) {
753 case AVMEDIA_TYPE_AUDIO:
754 asf_st->type = AVMEDIA_TYPE_AUDIO;
755 if ((ret = ff_get_wav_header(pb, st->codec, ts_data_len)) < 0)
756 return ret;
757 break;
758 case AVMEDIA_TYPE_VIDEO:
759 asf_st->type = AVMEDIA_TYPE_VIDEO;
760 if ((ret = parse_video_info(pb, st)) < 0)
761 return ret;
762 break;
763 default:
764 avio_skip(pb, ts_data_len);
765 break;
766 }
767
768 if (err_data_len) {
769 if (type == AVMEDIA_TYPE_AUDIO) {
770 uint8_t span = avio_r8(pb);
771 if (span > 1) {
772 asf_st->span = span;
773 asf_st->virtual_pkt_len = avio_rl16(pb);
774 asf_st->virtual_chunk_len = avio_rl16(pb);
775 avio_skip(pb, err_data_len - 5);
776 } else
777 avio_skip(pb, err_data_len - 1);
778 } else
779 avio_skip(pb, err_data_len);
780 }
781
782 asf->nb_streams++;
783 align_position(pb, asf->offset, size);
784
785 return 0;
786 }
787
788 static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
789 {
790 // language abbr should contain at least 2 chars
791 if (rfc1766 && strlen(rfc1766) > 1) {
792 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
793 const char *iso6392 = av_convert_lang_to(primary_tag,
794 AV_LANG_ISO639_2_BIBL);
795 if (iso6392)
796 if (av_dict_set(met, "language", iso6392, 0) < 0)
797 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
798 }
799 }
800
801 static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
802 {
803 ASFContext *asf = s->priv_data;
804 AVIOContext *pb = s->pb;
805 AVStream *st = NULL;
806 ff_asf_guid guid;
807 uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
808 int i, ret;
809 uint32_t bitrate;
810 uint64_t start_time, end_time, time_per_frame;
811 uint64_t size = avio_rl64(pb);
812
813 start_time = avio_rl64(pb);
814 end_time = avio_rl64(pb);
815 bitrate = avio_rl32(pb);
816 avio_skip(pb, 28); // skip some unused values
817 st_num = avio_rl16(pb);
818 st_num &= ASF_STREAM_NUM;
819 lang_idx = avio_rl16(pb); // Stream Language ID Index
820 for (i = 0; i < asf->nb_streams; i++) {
821 if (st_num == asf->asf_st[i]->stream_index) {
822 st = s->streams[asf->asf_st[i]->index];
823 asf->asf_st[i]->lang_idx = lang_idx;
824 break;
825 }
826 }
827 time_per_frame = avio_rl64(pb); // average time per frame
828 if (st) {
829 st->start_time = start_time;
830 st->duration = end_time - start_time;
831 st->codec->bit_rate = bitrate;
832 st->avg_frame_rate.num = 10000000;
833 st->avg_frame_rate.den = time_per_frame;
834 }
835 nb_st_name = avio_rl16(pb);
836 nb_pay_exts = avio_rl16(pb);
837 for (i = 0; i < nb_st_name; i++) {
838 uint16_t len;
839
840 avio_rl16(pb); // Language ID Index
841 len = avio_rl16(pb);
842 avio_skip(pb, len);
843 }
844
845 for (i = 0; i < nb_pay_exts; i++) {
846 uint32_t len;
847 avio_skip(pb, 16); // Extension System ID
848 avio_skip(pb, 2); // Extension Data Size
849 len = avio_rl32(pb);
850 avio_skip(pb, len);
851 }
852
853 if ((ret = ff_get_guid(pb, &guid)) < 0) {
854 align_position(pb, asf->offset, size);
855
856 return 0;
857 }
858
859 g = find_guid(guid);
860 if (g && !(strcmp(g->name, "Stream Properties"))) {
861 if ((ret = g->read_object(s, g)) < 0)
862 return ret;
863 }
864
865 align_position(pb, asf->offset, size);
866 return 0;
867 }
868
869 static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
870 {
871 ASFContext *asf = s->priv_data;
872 AVIOContext *pb = s->pb;
873 int i, ret;
874 uint64_t size = avio_rl64(pb);
875 uint16_t nb_langs = avio_rl16(pb);
876
877 if (nb_langs < ASF_MAX_STREAMS) {
878 for (i = 0; i < nb_langs; i++) {
879 size_t len;
880 len = avio_r8(pb);
881 if (!len)
882 len = 6;
883 if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
884 sizeof(asf->asf_sd[i].langs))) < 0) {
885 return ret;
886 }
887 }
888 }
889
890 align_position(pb, asf->offset, size);
891 return 0;
892 }
893
894 // returns data object offset when reading this object for the first time
895 static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
896 {
897 ASFContext *asf = s->priv_data;
898 AVIOContext *pb = s->pb;
899 uint64_t size = asf->data_size = avio_rl64(pb);
900 int i;
901
902 if (!asf->data_reached && pb->seekable) {
903 asf->data_reached = 1;
904 asf->data_offset = asf->offset;
905 }
906
907 for (i = 0; i < asf->nb_streams; i++) {
908 if (!(asf->b_flags & ASF_FLAG_BROADCAST))
909 s->streams[i]->duration = asf->duration;
910 }
911 asf->nb_mult_left = 0;
912 asf->sub_left = 0;
913 asf->state = PARSE_PACKET_HEADER;
914 asf->return_subpayload = 0;
915 asf->packet_size_internal = 0;
916 avio_skip(pb, 16); // skip File ID
917 size = avio_rl64(pb); // Total Data Packets
918 if (size != asf->nb_packets)
919 av_log(s, AV_LOG_WARNING,
920 "Number of Packets from File Properties Object is not equal to Total"
921 "Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
922 size, asf->nb_packets);
923 avio_skip(pb, 2); // skip reserved field
924 asf->first_packet_offset = avio_tell(pb);
925 align_position(pb, asf->offset, asf->data_size);
926
927 return 0;
928 }
929
930 static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
931 {
932 ASFContext *asf = s->priv_data;
933 AVIOContext *pb = s->pb;
934 AVStream *st = NULL;
935 uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
936 uint32_t pkt_num, nb_entries;
937 int32_t prev_pkt_num = -1;
938 int i;
939 uint64_t size = avio_rl64(pb);
940
941 // simple index objects should be ordered by stream number, this loop tries to find
942 // the first not indexed video stream
943 for (i = 0; i < asf->nb_streams; i++) {
944 if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
945 asf->asf_st[i]->indexed = 1;
946 st = s->streams[asf->asf_st[i]->index];
947 break;
948 }
949 }
950 if (!st) {
951 avio_skip(pb, size - 24); // if there's no video stream, skip index object
952 return 0;
953 }
954 avio_skip(pb, 16); // skip File ID
955 interval = avio_rl64(pb);
956 avio_skip(pb, 4);
957 nb_entries = avio_rl32(pb);
958 for (i = 0; i < nb_entries; i++) {
959 pkt_num = avio_rl32(pb);
960 avio_skip(pb, 2);
961 if (prev_pkt_num != pkt_num) {
962 av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
963 pkt_num, av_rescale(interval, i, 10000),
964 asf->packet_size, 0, AVINDEX_KEYFRAME);
965 prev_pkt_num = pkt_num;
966 }
967 }
968 asf->is_simple_index = 1;
969 align_position(pb, asf->offset, size);
970
971 return 0;
972 }
973
974 static const GUIDParseTable gdef[] = {
975 { "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
976 { "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
977 { "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
978 { "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
979 { "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
980 { "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
981 { "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
982 { "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
983 { "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
984 { "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
985 { "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
986 { "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
987 { "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
988 { "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
989 { "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
990 { "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
991 { "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
992 { "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
993 { "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
994 { "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
995 { "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
996 { "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
997 { "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
998 { "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
999 { "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 },
1000 { "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
1001 { "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
1002 { "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
1003 { "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1004 { "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
1005 { "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
1006 { "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
1007 { "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1008 { "Content Encryption System Windows Media DRM Network Devices",
1009 { 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
1010 { "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1011 { "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1012 { "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1013 { "Bandwith Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1014 { "Bandwith Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1015 { "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
1016 { "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 },
1017 { "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 },
1018 { "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 },
1019 { "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 },
1020 { "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 },
1021 { "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 },
1022 };
1023
1024 #define READ_LEN(flag, name, len) \
1025 do { \
1026 if ((flag) == name ## IS_BYTE) \
1027 len = avio_r8(pb); \
1028 else if ((flag) == name ## IS_WORD) \
1029 len = avio_rl16(pb); \
1030 else if ((flag) == name ## IS_DWORD) \
1031 len = avio_rl32(pb); \
1032 else \
1033 len = 0; \
1034 } while(0)
1035
1036 static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
1037 {
1038 ASFContext *asf = s->priv_data;
1039 AVIOContext *pb = s->pb;
1040 uint8_t sub_len;
1041 int ret, i;
1042
1043 if (is_header) {
1044 asf->dts_delta = avio_r8(pb);
1045 if (asf->nb_mult_left) {
1046 asf->mult_sub_len = avio_rl16(pb); // total
1047 }
1048 asf->sub_header_offset = avio_tell(pb);
1049 asf->nb_sub = 0;
1050 asf->sub_left = 1;
1051 }
1052 sub_len = avio_r8(pb);
1053 if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
1054 return ret;
1055 for (i = 0; i < asf->nb_streams; i++) {
1056 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1057 pkt->stream_index = asf->asf_st[i]->index;
1058 break;
1059 }
1060 }
1061 asf->return_subpayload = 1;
1062 if (!sub_len)
1063 asf->return_subpayload = 0;
1064
1065 if (sub_len)
1066 asf->nb_sub++;
1067 pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
1068 if (asf->nb_mult_left && (avio_tell(pb) >=
1069 (asf->sub_header_offset + asf->mult_sub_len))) {
1070 asf->sub_left = 0;
1071 asf->nb_mult_left--;
1072 }
1073 if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
1074 asf->sub_left = 0;
1075 if (!asf->nb_mult_left) {
1076 avio_skip(pb, asf->pad_len);
1077 if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
1078 if (!asf->packet_size)
1079 return AVERROR_INVALIDDATA;
1080 av_log(s, AV_LOG_WARNING,
1081 "Position %"PRId64" wrong, should be %"PRId64"\n",
1082 avio_tell(pb), asf->packet_offset + asf->packet_size);
1083 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1084 }
1085 }
1086 }
1087
1088 return 0;
1089 }
1090
1091 static void reset_packet(ASFPacket *asf_pkt)
1092 {
1093 asf_pkt->size_left = 0;
1094 asf_pkt->data_size = 0;
1095 asf_pkt->duration = 0;
1096 asf_pkt->flags = 0;
1097 asf_pkt->dts = 0;
1098 asf_pkt->duration = 0;
1099 av_free_packet(&asf_pkt->avpkt);
1100 av_init_packet(&asf_pkt->avpkt);
1101 }
1102
1103 static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
1104 ASFPacket *asf_pkt)
1105 {
1106 ASFContext *asf = s->priv_data;
1107 AVIOContext *pb = s->pb;
1108 uint16_t pay_len;
1109 unsigned char *p;
1110 int ret;
1111 int skip = 0;
1112
1113 // if replicated lenght is 1, subpayloads are present
1114 if (asf->rep_data_len == 1) {
1115 asf->sub_left = 1;
1116 asf->state = READ_MULTI_SUB;
1117 pkt->flags = asf_pkt->flags;
1118 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1119 return ret;
1120 } else {
1121 if (!asf_pkt->data_size) {
1122 asf_pkt->data_size = asf_pkt->size_left = avio_rl32(pb); // read media object size
1123 if (asf_pkt->data_size <= 0)
1124 return AVERROR_EOF;
1125 if ((ret = av_new_packet(&asf_pkt->avpkt, asf_pkt->data_size)) < 0)
1126 return ret;
1127 } else
1128 avio_skip(pb, 4); // reading of media object size is already done
1129 asf_pkt->dts = avio_rl32(pb); // read presentation time
1130 if ((asf->rep_data_len - 8) > 0)
1131 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1132 pay_len = avio_rl16(pb); // payload length should be WORD
1133 if (pay_len > asf->packet_size) {
1134 av_log(s, AV_LOG_ERROR,
1135 "Error: invalid data packet size, pay_len %"PRIu16", "
1136 "asf->packet_size %"PRIu32", offset %"PRId64".\n",
1137 pay_len, asf->packet_size, avio_tell(pb));
1138 return AVERROR_INVALIDDATA;
1139 }
1140 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1141 if (pay_len > asf_pkt->size_left) {
1142 av_log(s, AV_LOG_ERROR,
1143 "Error: invalid buffer size, pay_len %d, data size left %d.\n",
1144 pay_len, asf_pkt->size_left);
1145 skip = pay_len - asf_pkt->size_left;
1146 pay_len = asf_pkt->size_left;
1147 }
1148 if ((ret = avio_read(pb, p, pay_len)) < 0)
1149 return ret;
1150 if (s->key && s->keylen == 20)
1151 ff_asfcrypt_dec(s->key, p, ret);
1152 avio_skip(pb, skip);
1153 asf_pkt->size_left -= pay_len;
1154 asf->nb_mult_left--;
1155 }
1156
1157 return 0;
1158 }
1159
1160 static int asf_read_single_payload(AVFormatContext *s, AVPacket *pkt,
1161 ASFPacket *asf_pkt)
1162 {
1163 ASFContext *asf = s->priv_data;
1164 AVIOContext *pb = s->pb;
1165 int64_t offset;
1166 uint64_t size;
1167 unsigned char *p;
1168 int ret;
1169
1170 if (!asf_pkt->data_size) {
1171 asf_pkt->data_size = asf_pkt->size_left = avio_rl32(pb); // read media object size
1172 if (asf_pkt->data_size <= 0)
1173 return AVERROR_EOF;
1174 if ((ret = av_new_packet(&asf_pkt->avpkt, asf_pkt->data_size)) < 0)
1175 return ret;
1176 } else
1177 avio_skip(pb, 4); // skip media object size
1178 asf_pkt->dts = avio_rl32(pb); // read presentation time
1179 if ((asf->rep_data_len - 8) > 0)
1180 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1181 offset = avio_tell(pb);
1182
1183 // size of the payload - size of the packet without header and padding
1184 if (asf->packet_size_internal)
1185 size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
1186 else
1187 size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
1188 if (size > asf->packet_size) {
1189 av_log(s, AV_LOG_ERROR,
1190 "Error: invalid data packet size, offset %"PRId64".\n",
1191 avio_tell(pb));
1192 return AVERROR_INVALIDDATA;
1193 }
1194 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1195 if (size > asf_pkt->size_left)
1196 return AVERROR_INVALIDDATA;
1197 if (asf_pkt->size_left > size)
1198 asf_pkt->size_left -= size;
1199 else
1200 asf_pkt->size_left = 0;
1201 if ((ret = avio_read(pb, p, size)) < 0)
1202 return ret;
1203 if (s->key && s->keylen == 20)
1204 ff_asfcrypt_dec(s->key, p, ret);
1205 if (asf->packet_size_internal)
1206 avio_skip(pb, asf->packet_size - asf->packet_size_internal);
1207 avio_skip(pb, asf->pad_len); // skip padding
1208
1209 return 0;
1210 }
1211
1212 static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
1213 {
1214 ASFContext *asf = s->priv_data;
1215 AVIOContext *pb = s->pb;
1216 int ret, i;
1217 ASFPacket *asf_pkt = NULL;
1218
1219 if (!asf->sub_left) {
1220 uint32_t off_len, media_len;
1221 uint8_t stream_num;
1222
1223 stream_num = avio_r8(pb);
1224 asf->stream_index = stream_num & ASF_STREAM_NUM;
1225 for (i = 0; i < asf->nb_streams; i++) {
1226 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1227 asf_pkt = &asf->asf_st[i]->pkt;
1228 asf_pkt->stream_index = asf->asf_st[i]->index;
1229 asf_pkt->dts = asf->dts;
1230 break;
1231 }
1232 }
1233 if (!asf_pkt)
1234 return AVERROR_INVALIDDATA;
1235 if (stream_num >> 7)
1236 asf_pkt->flags |= AV_PKT_FLAG_KEY;
1237 READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
1238 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
1239 READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
1240 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
1241 READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
1242 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
1243 if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
1244 av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
1245 reset_packet(asf_pkt);
1246 }
1247 asf_pkt->frame_num = media_len;
1248 asf->sub_dts = off_len;
1249 if (asf->nb_mult_left) {
1250 if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
1251 return ret;
1252 } else if (asf->rep_data_len == 1) {
1253 asf->sub_left = 1;
1254 asf->state = READ_SINGLE;
1255 pkt->flags = asf_pkt->flags;
1256 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1257 return ret;
1258 } else {
1259 if ((ret = asf_read_single_payload(s, pkt, asf_pkt)) < 0)
1260 return ret;
1261 }
1262 } else {
1263 for (i = 0; i <= asf->nb_streams; i++) {
1264 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1265 asf_pkt = &asf->asf_st[i]->pkt;
1266 break;
1267 }
1268 }
1269 if (!asf_pkt)
1270 return AVERROR_INVALIDDATA;
1271 pkt->flags = asf_pkt->flags;
1272 pkt->dts = asf_pkt->dts;
1273 pkt->stream_index = asf->asf_st[i]->index;
1274 if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
1275 return ret;
1276 }
1277
1278 return 0;
1279 }
1280
1281 static int asf_read_packet_header(AVFormatContext *s)
1282 {
1283 ASFContext *asf = s->priv_data;
1284 AVIOContext *pb = s->pb;
1285 uint64_t size;
1286 uint32_t av_unused seq;
1287 unsigned char error_flags, len_flags, pay_flags;
1288
1289 asf->packet_offset = avio_tell(pb);
1290 error_flags = avio_r8(pb); // read Error Correction Flags
1291 if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT)
1292 if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
1293 size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
1294 avio_skip(pb, size);
1295 }
1296 len_flags = avio_r8(pb);
1297 asf->prop_flags = avio_r8(pb);
1298 READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
1299 ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
1300 READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
1301 ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
1302 READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
1303 ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
1304 asf->send_time = avio_rl32(pb); // send time
1305 avio_skip(pb, 2); // skip duration
1306 if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
1307 pay_flags = avio_r8(pb);
1308 asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
1309 }
1310
1311 return 0;
1312 }
1313
1314 static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
1315 {
1316 ASFContext *asf = s->priv_data;
1317 ASFStream *asf_st = asf->asf_st[st_num];
1318 unsigned char *p = asf_pkt->avpkt.data;
1319 uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
1320 uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
1321 int nchunks = pkt_len / chunk_len;
1322 AVPacket pkt;
1323 int pos = 0, j, l, ret;
1324
1325
1326 if ((ret = av_new_packet(&pkt, asf_pkt->data_size)) < 0)
1327 return ret;
1328
1329 while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
1330 if (pos >= asf_pkt->data_size) {
1331 break;
1332 }
1333 for (l = 0; l < pkt_len; l++) {
1334 if (pos >= asf_pkt->data_size) {
1335 break;
1336 }
1337 for (j = 0; j < asf_st->span; j++) {
1338 if ((pos + chunk_len) >= asf_pkt->data_size)
1339 break;
1340 memcpy(pkt.data + pos,
1341 p + (j * nchunks + l) * chunk_len,
1342 chunk_len);
1343 pos += chunk_len;
1344 }
1345 }
1346 p += asf_st->span * pkt_len;
1347 if (p > asf_pkt->avpkt.data + asf_pkt->data_size)
1348 break;
1349 }
1350 av_free_packet(&asf_pkt->avpkt);
1351 asf_pkt->avpkt = pkt;
1352
1353 return 0;
1354 }
1355
1356 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1357 {
1358 ASFContext *asf = s->priv_data;
1359 AVIOContext *pb = s->pb;
1360 int ret, i;
1361
1362 if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
1363 !(asf->b_flags & ASF_FLAG_BROADCAST))
1364 return AVERROR_EOF;
1365 while (!pb->eof_reached) {
1366 if (asf->state == PARSE_PACKET_HEADER) {
1367 asf_read_packet_header(s);
1368 if (!asf->nb_mult_left)
1369 asf->state = READ_SINGLE;
1370 else
1371 asf->state = READ_MULTI;
1372 }
1373 if ((ret = asf_read_payload(s, pkt)) < 0)
1374 return ret;
1375 switch (asf->state) {
1376 case READ_SINGLE:
1377 if (!asf->sub_left)
1378 asf->state = PARSE_PACKET_HEADER;
1379 break;
1380 case READ_MULTI_SUB:
1381 if (!asf->sub_left && !asf->nb_mult_left) {
1382 asf->state = PARSE_PACKET_HEADER;
1383 if (!asf->return_subpayload)
1384 avio_skip(pb, asf->pad_len); // skip padding
1385 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1386 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1387 } else if (!asf->sub_left)
1388 asf->state = READ_MULTI;
1389 break;
1390 case READ_MULTI:
1391 if (!asf->nb_mult_left) {
1392 asf->state = PARSE_PACKET_HEADER;
1393 if (!asf->return_subpayload) {
1394 avio_skip(pb, asf->pad_len); // skip padding
1395 }
1396 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1397 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1398 }
1399 break;
1400 }
1401 if (asf->return_subpayload) {
1402 asf->return_subpayload = 0;
1403 return 0;
1404 }
1405 for (i = 0; i < s->nb_streams; i++) {
1406 ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
1407 if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
1408 if (asf->asf_st[i]->span > 1 &&
1409 asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
1410 if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
1411 return ret;
1412 av_packet_move_ref(pkt, &asf_pkt->avpkt);
1413 pkt->stream_index = asf->asf_st[i]->index;
1414 pkt->flags = asf_pkt->flags;
1415 pkt->dts = asf_pkt->dts - asf->preroll;
1416 asf_pkt->data_size = 0;
1417 asf_pkt->frame_num = 0;
1418 return 0;
1419 }
1420 }
1421 }
1422
1423 if (pb->eof_reached)
1424 return AVERROR_EOF;
1425
1426 return 0;
1427 }
1428
1429 static int asf_read_close(AVFormatContext *s)
1430 {
1431 ASFContext *asf = s->priv_data;
1432 int i;
1433
1434 for (i = 0; i < asf->nb_streams; i++) {
1435 av_free_packet(&asf->asf_st[i]->pkt.avpkt);
1436 av_freep(&asf->asf_st[i]);
1437 av_dict_free(&asf->asf_sd[i].asf_met);
1438 }
1439
1440 return 0;
1441 }
1442
1443 static void reset_packet_state(AVFormatContext *s)
1444 {
1445 ASFContext *asf = s->priv_data;
1446 int i;
1447
1448 asf->state = PARSE_PACKET_HEADER;
1449 asf->offset = 0;
1450 asf->return_subpayload = 0;
1451 asf->sub_left = 0;
1452 asf->sub_header_offset = 0;
1453 asf->packet_offset = asf->first_packet_offset;
1454 asf->pad_len = 0;
1455 asf->rep_data_len = 0;
1456 asf->dts_delta = 0;
1457 asf->mult_sub_len = 0;
1458 asf->nb_mult_left = 0;
1459 asf->nb_sub = 0;
1460 asf->prop_flags = 0;
1461 asf->sub_dts = 0;
1462 asf->dts = 0;
1463 for (i = 0; i < asf->nb_streams; i++) {
1464 ASFPacket *pkt = &asf->asf_st[i]->pkt;
1465 pkt->size_left = 0;
1466 pkt->data_size = 0;
1467 pkt->duration = 0;
1468 pkt->flags = 0;
1469 pkt->dts = 0;
1470 pkt->duration = 0;
1471 av_free_packet(&pkt->avpkt);
1472 av_init_packet(&pkt->avpkt);
1473 }
1474 }
1475
1476 /*
1477 * Find a timestamp for the requested position within the payload
1478 * where the pos (position) is the offset inside the Data Object.
1479 * When position is not on the packet boundary, asf_read_timestamp tries
1480 * to find the closest packet offset after this position. If this packet
1481 * is a key frame, this packet timestamp is read and an index entry is created
1482 * for the packet. If this packet belongs to the requested stream,
1483 * asf_read_timestamp upgrades pos to the packet beginning offset and
1484 * returns this packet's dts. So returned dts is the dts of the first key frame with
1485 * matching stream number after given position.
1486 */
1487 static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
1488 int64_t *pos, int64_t pos_limit)
1489 {
1490 ASFContext *asf = s->priv_data;
1491 int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
1492 AVPacket pkt;
1493 int n;
1494
1495 data_end = asf->data_offset + asf->data_size;
1496
1497 n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
1498 asf->packet_size;
1499 n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
1500 pkt_pos = asf->first_packet_offset + n * asf->packet_size;
1501
1502 avio_seek(s->pb, pkt_pos, SEEK_SET);
1503 pkt_offset = pkt_pos;
1504
1505 reset_packet_state(s);
1506 while (avio_tell(s->pb) < data_end) {
1507
1508 int i, ret, st_found;
1509
1510 av_init_packet(&pkt);
1511 pkt_offset = avio_tell(s->pb);
1512 if ((ret = asf_read_packet(s, &pkt)) < 0) {
1513 dts = AV_NOPTS_VALUE;
1514 return ret;
1515 }
1516 // ASFPacket may contain fragments of packets belonging to different streams,
1517 // pkt_offset is the offset of the first fragment within it.
1518 if ((pkt_offset >= (pkt_pos + asf->packet_size)))
1519 pkt_pos += asf->packet_size;
1520 for (i = 0; i < asf->nb_streams; i++) {
1521 ASFStream *st = asf->asf_st[i];
1522
1523 st_found = 0;
1524 if (pkt.flags & AV_PKT_FLAG_KEY) {
1525 dts = pkt.dts;
1526 if (dts) {
1527 av_add_index_entry(s->streams[pkt.stream_index], pkt_pos,
1528 dts, pkt.size, 0, AVINDEX_KEYFRAME);
1529 if (stream_index == st->index) {
1530 st_found = 1;
1531 break;
1532 }
1533 }
1534 }
1535 }
1536 if (st_found)
1537 break;
1538 av_free_packet(&pkt);
1539 }
1540 *pos = pkt_pos;
1541
1542 av_free_packet(&pkt);
1543 return dts;
1544 }
1545
1546 static int asf_read_seek(AVFormatContext *s, int stream_index,
1547 int64_t timestamp, int flags)
1548 {
1549 ASFContext *asf = s->priv_data;
1550 int idx, ret;
1551
1552 if (s->streams[stream_index]->nb_index_entries && asf->is_simple_index) {
1553 idx = av_index_search_timestamp(s->streams[stream_index], timestamp, flags);
1554 if (idx < 0 || idx >= s->streams[stream_index]->nb_index_entries)
1555 return AVERROR_INVALIDDATA;
1556 avio_seek(s->pb, s->streams[stream_index]->index_entries[idx].pos, SEEK_SET);
1557 } else {
1558 if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
1559 return ret;
1560
1561 // asf_read_timestamp is called inside ff_seek_frame_binary and leaves state dirty,
1562 // so reset_packet_state have to be called after it.
1563 reset_packet_state(s);
1564 }
1565
1566 return 0;
1567 }
1568
1569 static const GUIDParseTable *find_guid(ff_asf_guid guid)
1570 {
1571 int j, ret;
1572 const GUIDParseTable *g;
1573
1574 swap_guid(guid);
1575 g = gdef;
1576 for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
1577 if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
1578 return g;
1579 g++;
1580 }
1581
1582 return NULL;
1583 }
1584
1585 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
1586 {
1587 ASFContext *asf = s->priv_data;
1588 AVIOContext *pb = s->pb;
1589 const GUIDParseTable *g = NULL;
1590 ff_asf_guid guid;
1591 int ret;
1592
1593 while (avio_tell(pb) <= offset + size) {
1594 asf->offset = avio_tell(pb);
1595 if ((ret = ff_get_guid(pb, &guid)) < 0)
1596 return ret;
1597 g = find_guid(guid);
1598 if (g) {
1599 if ((ret = g->read_object(s, g)) < 0)
1600 return ret;
1601 } else {
1602 GUIDParseTable g2;
1603
1604 g2.name = "Unknown";
1605 g2.is_subobject = 1;
1606 asf_read_unknown(s, &g2);
1607 }
1608 }
1609
1610 return 0;
1611 }
1612
1613 static int asf_read_header(AVFormatContext *s)
1614 {
1615 ASFContext *asf = s->priv_data;
1616 AVIOContext *pb = s->pb;
1617 const GUIDParseTable *g = NULL;
1618 ff_asf_guid guid;
1619 int i, ret;
1620 uint64_t size;
1621
1622 asf->preroll = 0;
1623 asf->is_simple_index = 0;
1624 ff_get_guid(pb, &guid);
1625 if (ff_guidcmp(&guid, &ff_asf_header))
1626 return AVERROR_INVALIDDATA;
1627 avio_skip(pb, 8); // skip header object size
1628 avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
1629 asf->data_reached = 0;
1630
1631 /* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
1632 * for the first time,
1633 * Index object is processed and got eof and then seeking back to the Data is performed.
1634 */
1635 while (1) {
1636 // for the cases when object size is invalid
1637 if (avio_tell(pb) == asf->offset) {
1638 if (asf->data_reached)
1639 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1640 break;
1641 }
1642 asf->offset = avio_tell(pb);
1643 if ((ret = ff_get_guid(pb, &guid)) < 0) {
1644 if (ret == AVERROR_EOF && asf->data_reached) {
1645 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1646 break;
1647 } else
1648 return ret;
1649 }
1650 g = find_guid(guid);
1651 if (g) {
1652 asf->unknown_offset = asf->offset;
1653 asf->is_header = 1;
1654 if ((ret = g->read_object(s, g)) < 0)
1655 return ret;
1656 } else {
1657 size = avio_rl64(pb);
1658 align_position(pb, asf->offset, size);
1659 }
1660 if (asf->data_reached && !pb->seekable)
1661 break;
1662 }
1663
1664 for (i = 0; i < asf->nb_streams; i++) {
1665 const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
1666 AVStream *st = s->streams[asf->asf_st[i]->index];
1667 set_language(s, rfc1766, &st->metadata);
1668 }
1669
1670 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1671 AVStream *st = NULL;
1672
1673 st = find_stream(s, i);
1674 if (st) {
1675 av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
1676 if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
1677 st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
1678 st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
1679 }
1680 }
1681 }
1682
1683 return 0;
1684 }
1685
1686 AVInputFormat ff_asf_demuxer = {
1687 .name = "asf",
1688 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1689 .priv_data_size = sizeof(ASFContext),
1690 .read_probe = asf_probe,
1691 .read_header = asf_read_header,
1692 .read_packet = asf_read_packet,
1693 .read_close = asf_read_close,
1694 .read_timestamp = asf_read_timestamp,
1695 .read_seek = asf_read_seek,
1696 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1697 };
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