FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/asfdec_o.c
Date: 2024-07-16 12:46:59
Exec Total Coverage
Lines: 4 950 0.4%
Functions: 1 40 2.5%
Branches: 2 574 0.3%

Line Branch Exec Source
1 /*
2 * Microsoft Advanced Streaming Format demuxer
3 * Copyright (c) 2014 Alexandra Hájková
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <time.h>
23
24 #include "libavutil/attributes.h"
25 #include "libavutil/common.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/mem.h"
30 #include "libavutil/time_internal.h"
31
32 #include "avformat.h"
33 #include "avlanguage.h"
34 #include "demux.h"
35 #include "internal.h"
36 #include "riff.h"
37 #include "asf.h"
38 #include "asfcrypt.h"
39
40 #define ASF_BOOL 0x2
41 #define ASF_WORD 0x5
42 #define ASF_GUID 0x6
43 #define ASF_DWORD 0x3
44 #define ASF_QWORD 0x4
45 #define ASF_UNICODE 0x0
46 #define ASF_FLAG_BROADCAST 0x1
47 #define ASF_BYTE_ARRAY 0x1
48 #define ASF_TYPE_AUDIO 0x2
49 #define ASF_TYPE_VIDEO 0x1
50 #define ASF_STREAM_NUM 0x7F
51 #define ASF_MAX_STREAMS 128
52 #define BMP_HEADER_SIZE 40
53 #define ASF_NUM_OF_PAYLOADS 0x3F
54 #define ASF_ERROR_CORRECTION_LENGTH_TYPE 0x60
55 #define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
56
57 typedef struct GUIDParseTable {
58 const char *name;
59 ff_asf_guid guid;
60 int (*read_object)(AVFormatContext *, const struct GUIDParseTable *);
61 int is_subobject;
62 } GUIDParseTable;
63
64 typedef struct ASFPacket {
65 AVPacket *avpkt;
66 int64_t dts;
67 uint32_t frame_num; // ASF payloads with the same number are parts of the same frame
68 int flags;
69 int data_size;
70 int duration;
71 int size_left;
72 uint8_t stream_index;
73 } ASFPacket;
74
75 typedef struct ASFStream {
76 uint8_t stream_index; // from packet header
77 int index; // stream index in AVFormatContext, set in asf_read_stream_properties
78 int type;
79 int indexed; // added index entries from the Simple Index Object or not
80 int8_t span; // for deinterleaving
81 uint16_t virtual_pkt_len;
82 uint16_t virtual_chunk_len;
83 int16_t lang_idx;
84 ASFPacket pkt;
85 } ASFStream;
86
87 typedef struct ASFStreamData{
88 char langs[32];
89 AVDictionary *asf_met; // for storing per-stream metadata
90 AVRational aspect_ratio;
91 } ASFStreamData;
92
93 typedef struct ASFContext {
94 int data_reached;
95 int is_simple_index; // is simple index present or not 1/0
96 int is_header;
97
98 uint64_t preroll;
99 uint64_t nb_packets; // ASF packets
100 uint32_t packet_size;
101 int64_t send_time;
102 int duration;
103
104 uint32_t b_flags; // flags with broadcast flag
105 uint32_t prop_flags; // file properties object flags
106
107 uint64_t data_size; // data object size
108 uint64_t unknown_size; // size of the unknown object
109
110 int64_t offset; // offset of the current object
111
112 int64_t data_offset;
113 int64_t first_packet_offset; // packet offset
114 int64_t unknown_offset; // for top level header objects or subobjects without specified behavior
115 int in_asf_read_unknown;
116
117 // ASF file must not contain more than 128 streams according to the specification
118 ASFStream *asf_st[ASF_MAX_STREAMS];
119 ASFStreamData asf_sd[ASF_MAX_STREAMS];
120 int nb_streams;
121
122 int stream_index; // from packet header, for the subpayload case
123
124 // packet parameters
125 uint64_t sub_header_offset; // offset of subpayload header
126 int64_t sub_dts;
127 uint8_t dts_delta; // for subpayloads
128 uint32_t packet_size_internal; // packet size stored inside ASFPacket, can be 0
129 int64_t packet_offset; // offset of the current packet inside Data Object
130 uint32_t pad_len; // padding after payload
131 uint32_t rep_data_len;
132
133 // packet state
134 uint64_t sub_left; // subpayloads left or not
135 unsigned int nb_sub; // number of subpayloads read so far from the current ASF packet
136 uint16_t mult_sub_len; // total length of subpayloads array inside multiple payload
137 uint64_t nb_mult_left; // multiple payloads left
138 int return_subpayload;
139 enum {
140 PARSE_PACKET_HEADER,
141 READ_SINGLE,
142 READ_MULTI,
143 READ_MULTI_SUB
144 } state;
145 } ASFContext;
146
147 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size);
148 static const GUIDParseTable *find_guid(ff_asf_guid guid);
149
150 7146 static int asf_probe(const AVProbeData *pd)
151 {
152 /* check file header */
153
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✓ Branch 1 taken 33 times.
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7146 if (!ff_guidcmp(pd->buf, &ff_asf_header))
154 33 return AVPROBE_SCORE_MAX/2;
155 else
156 7113 return 0;
157 }
158
159 static void swap_guid(ff_asf_guid guid)
160 {
161 FFSWAP(unsigned char, guid[0], guid[3]);
162 FFSWAP(unsigned char, guid[1], guid[2]);
163 FFSWAP(unsigned char, guid[4], guid[5]);
164 FFSWAP(unsigned char, guid[6], guid[7]);
165 }
166
167 static void align_position(AVIOContext *pb, int64_t offset, uint64_t size)
168 {
169 if (size < INT64_MAX - offset && avio_tell(pb) != offset + size)
170 avio_seek(pb, offset + size, SEEK_SET);
171 }
172
173 static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
174 {
175 ASFContext *asf = s->priv_data;
176 AVIOContext *pb = s->pb;
177 uint64_t size = avio_rl64(pb);
178 int ret;
179
180 if (size > INT64_MAX || asf->in_asf_read_unknown > 5)
181 return AVERROR_INVALIDDATA;
182
183 if (asf->is_header)
184 asf->unknown_size = size;
185 asf->is_header = 0;
186 if (!g->is_subobject) {
187 if (!(ret = strcmp(g->name, "Header Extension")))
188 avio_skip(pb, 22); // skip reserved fields and Data Size
189 asf->in_asf_read_unknown ++;
190 ret = detect_unknown_subobject(s, asf->unknown_offset,
191 asf->unknown_size);
192 asf->in_asf_read_unknown --;
193 if (ret < 0)
194 return ret;
195 } else {
196 if (size < 24) {
197 av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
198 return AVERROR_INVALIDDATA;
199 }
200 avio_skip(pb, size - 24);
201 }
202
203 return 0;
204 }
205
206 static int get_asf_string(AVIOContext *pb, int maxlen, char *buf, int buflen)
207 {
208 char *q = buf;
209 int ret = 0;
210 if (buflen <= 0)
211 return AVERROR(EINVAL);
212 while (ret + 1 < maxlen) {
213 uint8_t tmp;
214 uint32_t ch;
215 GET_UTF16(ch, (ret += 2) <= maxlen ? avio_rl16(pb) : 0, break;);
216 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)
217 }
218 *q = 0;
219
220 return ret;
221 }
222
223 static int asf_read_marker(AVFormatContext *s, const GUIDParseTable *g)
224 {
225 ASFContext *asf = s->priv_data;
226 AVIOContext *pb = s->pb;
227 uint64_t size = avio_rl64(pb);
228 int i, nb_markers, ret;
229 size_t len;
230 char name[1024];
231
232 avio_skip(pb, 8);
233 avio_skip(pb, 8); // skip reserved GUID
234 nb_markers = avio_rl32(pb);
235 avio_skip(pb, 2); // skip reserved field
236 len = avio_rl16(pb);
237 for (i = 0; i < len; i++)
238 avio_skip(pb, 1);
239
240 for (i = 0; i < nb_markers; i++) {
241 int64_t pts;
242
243 avio_skip(pb, 8);
244 pts = avio_rl64(pb);
245 pts -= asf->preroll * 10000;
246 avio_skip(pb, 2); // entry length
247 avio_skip(pb, 4); // send time
248 avio_skip(pb, 4); // flags
249 len = avio_rl32(pb);
250
251 if (avio_feof(pb))
252 return AVERROR_INVALIDDATA;
253
254 if ((ret = avio_get_str16le(pb, len, name,
255 sizeof(name))) < len)
256 avio_skip(pb, len - ret);
257 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pts,
258 AV_NOPTS_VALUE, name);
259 }
260 align_position(pb, asf->offset, size);
261
262 return 0;
263 }
264
265 static int asf_read_metadata(AVFormatContext *s, const char *title, uint16_t len,
266 unsigned char *ch, uint16_t buflen)
267 {
268 AVIOContext *pb = s->pb;
269
270 avio_get_str16le(pb, len, ch, buflen);
271 if (ch[0]) {
272 if (av_dict_set(&s->metadata, title, ch, 0) < 0)
273 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
274 }
275
276 return 0;
277 }
278
279 static int asf_read_value(AVFormatContext *s, const uint8_t *name,
280 uint16_t val_len, int type, AVDictionary **met)
281 {
282 int ret;
283 uint8_t *value;
284 uint16_t buflen = 2 * val_len + 1;
285 AVIOContext *pb = s->pb;
286
287 value = av_malloc(buflen);
288 if (!value)
289 return AVERROR(ENOMEM);
290 if (type == ASF_UNICODE) {
291 // get_asf_string reads UTF-16 and converts it to UTF-8 which needs longer buffer
292 if ((ret = get_asf_string(pb, val_len, value, buflen)) < 0)
293 goto failed;
294 if (av_dict_set(met, name, value, 0) < 0)
295 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
296 } else {
297 char buf[256];
298 if (val_len > sizeof(buf)) {
299 ret = AVERROR_INVALIDDATA;
300 goto failed;
301 }
302 if ((ret = avio_read(pb, value, val_len)) < 0)
303 goto failed;
304 if (ret < 2 * val_len)
305 value[ret] = '\0';
306 else
307 value[2 * val_len - 1] = '\0';
308 snprintf(buf, sizeof(buf), "%s", value);
309 if (av_dict_set(met, name, buf, 0) < 0)
310 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
311 }
312 av_freep(&value);
313
314 return 0;
315
316 failed:
317 av_freep(&value);
318 return ret;
319 }
320 static int asf_read_generic_value(AVIOContext *pb, int type, uint64_t *value)
321 {
322
323 switch (type) {
324 case ASF_BOOL:
325 *value = avio_rl16(pb);
326 break;
327 case ASF_DWORD:
328 *value = avio_rl32(pb);
329 break;
330 case ASF_QWORD:
331 *value = avio_rl64(pb);
332 break;
333 case ASF_WORD:
334 *value = avio_rl16(pb);
335 break;
336 default:
337 return AVERROR_INVALIDDATA;
338 }
339
340 return 0;
341 }
342
343 static int asf_set_metadata(AVFormatContext *s, const uint8_t *name,
344 int type, AVDictionary **met)
345 {
346 AVIOContext *pb = s->pb;
347 uint64_t value;
348 char buf[32];
349 int ret;
350
351 ret = asf_read_generic_value(pb, type, &value);
352 if (ret < 0)
353 return ret;
354
355 snprintf(buf, sizeof(buf), "%"PRIu64, value);
356 if (av_dict_set(met, name, buf, 0) < 0)
357 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
358
359 return 0;
360 }
361
362 static int process_metadata(AVFormatContext *s, const uint8_t *name, uint16_t name_len,
363 uint16_t val_len, uint16_t type, AVDictionary **met)
364 {
365 int ret;
366 ff_asf_guid guid;
367
368 if (val_len) {
369 switch (type) {
370 case ASF_UNICODE:
371 asf_read_value(s, name, val_len, type, met);
372 break;
373 case ASF_BYTE_ARRAY:
374 if (ff_asf_handle_byte_array(s, name, val_len) > 0)
375 asf_read_value(s, name, val_len, type, met);
376 break;
377 case ASF_GUID:
378 ff_get_guid(s->pb, &guid);
379 break;
380 default:
381 if ((ret = asf_set_metadata(s, name, type, met)) < 0)
382 return ret;
383 break;
384 }
385 }
386
387 return 0;
388 }
389
390 static int asf_read_ext_content(AVFormatContext *s, const GUIDParseTable *g)
391 {
392 ASFContext *asf = s->priv_data;
393 AVIOContext *pb = s->pb;
394 uint64_t size = avio_rl64(pb);
395 uint16_t nb_desc = avio_rl16(pb);
396 int i, ret;
397
398 for (i = 0; i < nb_desc; i++) {
399 uint16_t name_len, type, val_len;
400 uint8_t *name = NULL;
401
402 name_len = avio_rl16(pb);
403 if (!name_len)
404 return AVERROR_INVALIDDATA;
405 name = av_malloc(name_len);
406 if (!name)
407 return AVERROR(ENOMEM);
408 avio_get_str16le(pb, name_len, name,
409 name_len);
410 type = avio_rl16(pb);
411 // BOOL values are 16 bits long in the Metadata Object
412 // but 32 bits long in the Extended Content Description Object
413 if (type == ASF_BOOL)
414 type = ASF_DWORD;
415 val_len = avio_rl16(pb);
416
417 ret = process_metadata(s, name, name_len, val_len, type, &s->metadata);
418 av_freep(&name);
419 if (ret < 0)
420 return ret;
421 }
422
423 align_position(pb, asf->offset, size);
424 return 0;
425 }
426
427 static AVStream *find_stream(AVFormatContext *s, uint16_t st_num)
428 {
429 AVStream *st = NULL;
430 ASFContext *asf = s->priv_data;
431 int i;
432
433 for (i = 0; i < asf->nb_streams; i++) {
434 if (asf->asf_st[i]->stream_index == st_num) {
435 st = s->streams[asf->asf_st[i]->index];
436 break;
437 }
438 }
439
440 return st;
441 }
442
443 static int asf_store_aspect_ratio(AVFormatContext *s, uint8_t st_num, uint8_t *name, int type)
444 {
445 ASFContext *asf = s->priv_data;
446 AVIOContext *pb = s->pb;
447 uint64_t value = 0;
448 int ret;
449
450 ret = asf_read_generic_value(pb, type, &value);
451 if (ret < 0)
452 return ret;
453
454 if (st_num < ASF_MAX_STREAMS) {
455 if (!strcmp(name, "AspectRatioX"))
456 asf->asf_sd[st_num].aspect_ratio.num = value;
457 else
458 asf->asf_sd[st_num].aspect_ratio.den = value;
459 }
460 return 0;
461 }
462
463 static int asf_read_metadata_obj(AVFormatContext *s, const GUIDParseTable *g)
464 {
465 ASFContext *asf = s->priv_data;
466 AVIOContext *pb = s->pb;
467 uint64_t size = avio_rl64(pb);
468 uint16_t nb_recs = avio_rl16(pb); // number of records in the Description Records list
469 int i, ret;
470
471 for (i = 0; i < nb_recs; i++) {
472 uint16_t name_len, buflen, type, val_len, st_num;
473 uint8_t *name = NULL;
474
475 avio_skip(pb, 2); // skip reserved field
476 st_num = avio_rl16(pb);
477 name_len = avio_rl16(pb);
478 buflen = 2 * name_len + 1;
479 if (!name_len)
480 break;
481 type = avio_rl16(pb);
482 val_len = avio_rl32(pb);
483 name = av_malloc(buflen);
484 if (!name)
485 return AVERROR(ENOMEM);
486 avio_get_str16le(pb, name_len, name,
487 buflen);
488 if (!strcmp(name, "AspectRatioX") || !strcmp(name, "AspectRatioY")) {
489 ret = asf_store_aspect_ratio(s, st_num, name, type);
490 if (ret < 0) {
491 av_freep(&name);
492 break;
493 }
494 } else {
495 if (st_num < ASF_MAX_STREAMS) {
496 if ((ret = process_metadata(s, name, name_len, val_len, type,
497 st_num ? &asf->asf_sd[st_num].asf_met
498 : &s->metadata)) < 0) {
499 av_freep(&name);
500 break;
501 }
502 }
503 }
504 av_freep(&name);
505 }
506
507 align_position(pb, asf->offset, size);
508 return 0;
509 }
510
511 static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
512 {
513 ASFContext *asf = s->priv_data;
514 AVIOContext *pb = s->pb;
515 int i;
516 static const char *const titles[] =
517 { "Title", "Author", "Copyright", "Description", "Rate" };
518 uint16_t len[5], buflen[5] = { 0 };
519 uint8_t *ch;
520 uint64_t size = avio_rl64(pb);
521
522 for (i = 0; i < 5; i++) {
523 len[i] = avio_rl16(pb);
524 // utf8 string should be <= 2 * utf16 string, extra byte for the terminator
525 buflen[i] = 2 * len[i] + 1;
526 }
527
528 for (i = 0; i < 5; i++) {
529 ch = av_malloc(buflen[i]);
530 if (!ch)
531 return(AVERROR(ENOMEM));
532 asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
533 av_freep(&ch);
534 }
535 align_position(pb, asf->offset, size);
536
537 return 0;
538 }
539
540 static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
541 {
542 ASFContext *asf = s->priv_data;
543 AVIOContext *pb = s->pb;
544 time_t creation_time;
545
546 avio_rl64(pb); // read object size
547 avio_skip(pb, 16); // skip File ID
548 avio_skip(pb, 8); // skip File size
549 creation_time = avio_rl64(pb);
550 if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
551 struct tm tmbuf;
552 struct tm *tm;
553 char buf[64];
554
555 // creation date is in 100 ns units from 1 Jan 1601, conversion to s
556 creation_time /= 10000000;
557 // there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
558 creation_time -= 11644473600;
559 tm = gmtime_r(&creation_time, &tmbuf);
560 if (tm) {
561 if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
562 buf[0] = '\0';
563 } else
564 buf[0] = '\0';
565 if (buf[0]) {
566 if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
567 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
568 }
569 }
570 asf->nb_packets = avio_rl64(pb);
571 asf->duration = avio_rl64(pb) / 10000; // stream duration
572 avio_skip(pb, 8); // skip send duration
573 asf->preroll = avio_rl64(pb);
574 asf->duration -= asf->preroll;
575 asf->b_flags = avio_rl32(pb);
576 avio_skip(pb, 4); // skip minimal packet size
577 asf->packet_size = avio_rl32(pb);
578 avio_skip(pb, 4); // skip max_bitrate
579
580 return 0;
581 }
582
583 static int parse_video_info(AVFormatContext *avfmt, AVIOContext *pb, AVStream *st)
584 {
585 uint16_t size_asf; // ASF-specific Format Data size
586 uint32_t size_bmp; // BMP_HEADER-specific Format Data size
587 unsigned int tag;
588
589 st->codecpar->width = avio_rl32(pb);
590 st->codecpar->height = avio_rl32(pb);
591 avio_skip(pb, 1); // skip reserved flags
592 size_asf = avio_rl16(pb);
593 tag = ff_get_bmp_header(pb, st, &size_bmp);
594 st->codecpar->codec_tag = tag;
595 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
596 size_bmp = FFMAX(size_asf, size_bmp);
597
598 if (size_bmp > BMP_HEADER_SIZE) {
599 int ret = ff_get_extradata(avfmt, st->codecpar, pb, size_bmp - BMP_HEADER_SIZE);
600
601 if (ret < 0)
602 return ret;
603 }
604 return 0;
605 }
606
607 static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
608 {
609 ASFContext *asf = s->priv_data;
610 AVIOContext *pb = s->pb;
611 uint64_t size;
612 uint32_t err_data_len, ts_data_len; // type specific data length
613 uint16_t flags;
614 ff_asf_guid stream_type;
615 enum AVMediaType type;
616 int i, ret;
617 uint8_t stream_index;
618 AVStream *st;
619 ASFStream *asf_st;
620
621 // ASF file must not contain more than 128 streams according to the specification
622 if (asf->nb_streams >= ASF_MAX_STREAMS)
623 return AVERROR_INVALIDDATA;
624
625 size = avio_rl64(pb);
626 ff_get_guid(pb, &stream_type);
627 if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
628 type = AVMEDIA_TYPE_AUDIO;
629 else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
630 type = AVMEDIA_TYPE_VIDEO;
631 else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
632 type = AVMEDIA_TYPE_VIDEO;
633 else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
634 type = AVMEDIA_TYPE_DATA;
635 else if (!ff_guidcmp(&stream_type,
636 &ff_asf_ext_stream_embed_stream_header))
637 type = AVMEDIA_TYPE_UNKNOWN;
638 else
639 return AVERROR_INVALIDDATA;
640
641 ff_get_guid(pb, &stream_type); // error correction type
642 avio_skip(pb, 8); // skip the time offset
643 ts_data_len = avio_rl32(pb);
644 err_data_len = avio_rl32(pb);
645 flags = avio_rl16(pb); // bit 15 - Encrypted Content
646
647 stream_index = flags & ASF_STREAM_NUM;
648 for (i = 0; i < asf->nb_streams; i++)
649 if (stream_index == asf->asf_st[i]->stream_index) {
650 av_log(s, AV_LOG_WARNING,
651 "Duplicate stream found, this stream will be ignored.\n");
652 align_position(pb, asf->offset, size);
653 return 0;
654 }
655
656 st = avformat_new_stream(s, NULL);
657 if (!st)
658 return AVERROR(ENOMEM);
659 avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
660 st->codecpar->codec_type = type;
661 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
662 if (!asf->asf_st[asf->nb_streams])
663 return AVERROR(ENOMEM);
664 asf_st = asf->asf_st[asf->nb_streams];
665 asf->nb_streams++;
666 asf_st->stream_index = stream_index;
667 asf_st->index = st->index;
668 asf_st->indexed = 0;
669 st->id = flags & ASF_STREAM_NUM;
670 asf_st->pkt.data_size = 0;
671 asf_st->pkt.avpkt = av_packet_alloc();
672 if (!asf_st->pkt.avpkt)
673 return AVERROR(ENOMEM);
674 avio_skip(pb, 4); // skip reserved field
675
676 switch (type) {
677 case AVMEDIA_TYPE_AUDIO:
678 asf_st->type = AVMEDIA_TYPE_AUDIO;
679 if ((ret = ff_get_wav_header(s, pb, st->codecpar, ts_data_len, 0)) < 0)
680 return ret;
681 break;
682 case AVMEDIA_TYPE_VIDEO:
683 asf_st->type = AVMEDIA_TYPE_VIDEO;
684 if ((ret = parse_video_info(s, pb, st)) < 0)
685 return ret;
686 break;
687 default:
688 avio_skip(pb, ts_data_len);
689 break;
690 }
691
692 if (err_data_len) {
693 if (type == AVMEDIA_TYPE_AUDIO) {
694 uint8_t span = avio_r8(pb);
695 if (span > 1) {
696 asf_st->span = span;
697 asf_st->virtual_pkt_len = avio_rl16(pb);
698 asf_st->virtual_chunk_len = avio_rl16(pb);
699 if (!asf_st->virtual_chunk_len || !asf_st->virtual_pkt_len)
700 return AVERROR_INVALIDDATA;
701 avio_skip(pb, err_data_len - 5);
702 } else
703 avio_skip(pb, err_data_len - 1);
704 } else
705 avio_skip(pb, err_data_len);
706 }
707
708 align_position(pb, asf->offset, size);
709
710 return 0;
711 }
712
713 static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
714 {
715 // language abbr should contain at least 2 chars
716 if (rfc1766 && strlen(rfc1766) > 1) {
717 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
718 const char *iso6392 = ff_convert_lang_to(primary_tag,
719 AV_LANG_ISO639_2_BIBL);
720 if (iso6392)
721 if (av_dict_set(met, "language", iso6392, 0) < 0)
722 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
723 }
724 }
725
726 static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
727 {
728 ASFContext *asf = s->priv_data;
729 AVIOContext *pb = s->pb;
730 AVStream *st = NULL;
731 ff_asf_guid guid;
732 uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
733 int i, ret;
734 uint32_t bitrate;
735 uint64_t start_time, end_time, time_per_frame;
736 uint64_t size = avio_rl64(pb);
737
738 start_time = avio_rl64(pb);
739 end_time = avio_rl64(pb);
740 bitrate = avio_rl32(pb);
741 avio_skip(pb, 28); // skip some unused values
742 st_num = avio_rl16(pb);
743 st_num &= ASF_STREAM_NUM;
744 lang_idx = avio_rl16(pb); // Stream Language ID Index
745 if (lang_idx >= ASF_MAX_STREAMS)
746 return AVERROR_INVALIDDATA;
747 for (i = 0; i < asf->nb_streams; i++) {
748 if (st_num == asf->asf_st[i]->stream_index) {
749 st = s->streams[asf->asf_st[i]->index];
750 asf->asf_st[i]->lang_idx = lang_idx;
751 break;
752 }
753 }
754 time_per_frame = avio_rl64(pb); // average time per frame
755 if (st) {
756 st->start_time = start_time;
757 st->duration = end_time - start_time;
758 st->codecpar->bit_rate = bitrate;
759 st->avg_frame_rate.num = 10000000;
760 st->avg_frame_rate.den = time_per_frame;
761 }
762 nb_st_name = avio_rl16(pb);
763 nb_pay_exts = avio_rl16(pb);
764 for (i = 0; i < nb_st_name; i++) {
765 uint16_t len;
766
767 avio_rl16(pb); // Language ID Index
768 len = avio_rl16(pb);
769 avio_skip(pb, len);
770 }
771
772 for (i = 0; i < nb_pay_exts; i++) {
773 uint32_t len;
774 avio_skip(pb, 16); // Extension System ID
775 avio_skip(pb, 2); // Extension Data Size
776 len = avio_rl32(pb);
777 avio_skip(pb, len);
778 }
779
780 if ((ret = ff_get_guid(pb, &guid)) < 0) {
781 align_position(pb, asf->offset, size);
782
783 return 0;
784 }
785
786 g = find_guid(guid);
787 if (g && !(strcmp(g->name, "Stream Properties"))) {
788 if ((ret = g->read_object(s, g)) < 0)
789 return ret;
790 }
791
792 align_position(pb, asf->offset, size);
793 return 0;
794 }
795
796 static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
797 {
798 ASFContext *asf = s->priv_data;
799 AVIOContext *pb = s->pb;
800 int i, ret;
801 uint64_t size = avio_rl64(pb);
802 uint16_t nb_langs = avio_rl16(pb);
803
804 if (nb_langs < ASF_MAX_STREAMS) {
805 for (i = 0; i < nb_langs; i++) {
806 size_t len;
807 len = avio_r8(pb);
808 if (!len)
809 len = 6;
810 if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
811 sizeof(asf->asf_sd[i].langs))) < 0) {
812 return ret;
813 }
814 }
815 }
816
817 align_position(pb, asf->offset, size);
818 return 0;
819 }
820
821 // returns data object offset when reading this object for the first time
822 static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
823 {
824 ASFContext *asf = s->priv_data;
825 AVIOContext *pb = s->pb;
826 uint64_t size = asf->data_size = avio_rl64(pb);
827 int i;
828
829 if (!asf->data_reached) {
830 asf->data_reached = 1;
831 asf->data_offset = asf->offset;
832 }
833
834 for (i = 0; i < asf->nb_streams; i++) {
835 if (!(asf->b_flags & ASF_FLAG_BROADCAST))
836 s->streams[i]->duration = asf->duration;
837 }
838 asf->nb_mult_left = 0;
839 asf->sub_left = 0;
840 asf->state = PARSE_PACKET_HEADER;
841 asf->return_subpayload = 0;
842 asf->packet_size_internal = 0;
843 avio_skip(pb, 16); // skip File ID
844 size = avio_rl64(pb); // Total Data Packets
845 if (size != asf->nb_packets)
846 av_log(s, AV_LOG_WARNING,
847 "Number of Packets from File Properties Object is not equal to Total"
848 "Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
849 size, asf->nb_packets);
850 avio_skip(pb, 2); // skip reserved field
851 asf->first_packet_offset = avio_tell(pb);
852 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(asf->b_flags & ASF_FLAG_BROADCAST))
853 align_position(pb, asf->offset, asf->data_size);
854
855 return 0;
856 }
857
858 static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
859 {
860 ASFContext *asf = s->priv_data;
861 AVIOContext *pb = s->pb;
862 AVStream *st = NULL;
863 uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
864 uint32_t pkt_num, nb_entries;
865 int32_t prev_pkt_num = -1;
866 int i;
867 int64_t offset;
868 uint64_t size = avio_rl64(pb);
869
870 // simple index objects should be ordered by stream number, this loop tries to find
871 // the first not indexed video stream
872 for (i = 0; i < asf->nb_streams; i++) {
873 if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
874 asf->asf_st[i]->indexed = 1;
875 st = s->streams[asf->asf_st[i]->index];
876 break;
877 }
878 }
879 if (!st) {
880 avio_skip(pb, size - 24); // if there's no video stream, skip index object
881 return 0;
882 }
883 avio_skip(pb, 16); // skip File ID
884 interval = avio_rl64(pb);
885 avio_skip(pb, 4);
886 nb_entries = avio_rl32(pb);
887 for (i = 0; i < nb_entries; i++) {
888 pkt_num = avio_rl32(pb);
889 offset = avio_skip(pb, 2);
890 if (offset < 0) {
891 av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
892 return offset;
893 }
894 if (asf->first_packet_offset > INT64_MAX - asf->packet_size * pkt_num)
895 return AVERROR_INVALIDDATA;
896 if (prev_pkt_num != pkt_num) {
897 av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
898 pkt_num, av_rescale(interval, i, 10000),
899 asf->packet_size, 0, AVINDEX_KEYFRAME);
900 prev_pkt_num = pkt_num;
901 }
902 }
903 asf->is_simple_index = 1;
904 align_position(pb, asf->offset, size);
905
906 return 0;
907 }
908
909 static const GUIDParseTable gdef[] = {
910 { "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
911 { "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
912 { "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
913 { "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
914 { "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
915 { "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
916 { "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
917 { "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
918 { "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
919 { "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
920 { "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
921 { "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
922 { "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
923 { "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
924 { "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
925 { "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
926 { "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
927 { "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
928 { "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
929 { "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
930 { "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
931 { "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
932 { "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
933 { "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
934 { "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 },
935 { "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
936 { "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
937 { "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
938 { "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
939 { "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
940 { "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
941 { "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
942 { "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
943 { "Content Encryption System Windows Media DRM Network Devices",
944 { 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
945 { "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
946 { "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
947 { "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
948 { "Bandwidth Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
949 { "Bandwidth Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
950 { "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
951 { "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 },
952 { "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 },
953 { "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 },
954 { "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 },
955 { "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 },
956 { "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 },
957 };
958
959 #define READ_LEN(flag, name, len) \
960 do { \
961 if ((flag) == name ## IS_BYTE) \
962 len = avio_r8(pb); \
963 else if ((flag) == name ## IS_WORD) \
964 len = avio_rl16(pb); \
965 else if ((flag) == name ## IS_DWORD) \
966 len = avio_rl32(pb); \
967 else \
968 len = 0; \
969 } while(0)
970
971 static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
972 {
973 ASFContext *asf = s->priv_data;
974 AVIOContext *pb = s->pb;
975 uint8_t sub_len;
976 int ret, i;
977
978 if (is_header) {
979 asf->dts_delta = avio_r8(pb);
980 if (asf->nb_mult_left) {
981 asf->mult_sub_len = avio_rl16(pb); // total
982 }
983 asf->sub_header_offset = avio_tell(pb);
984 asf->nb_sub = 0;
985 asf->sub_left = 1;
986 }
987 sub_len = avio_r8(pb);
988 if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
989 return ret;
990 for (i = 0; i < asf->nb_streams; i++) {
991 if (asf->stream_index == asf->asf_st[i]->stream_index) {
992 pkt->stream_index = asf->asf_st[i]->index;
993 break;
994 }
995 }
996 asf->return_subpayload = 1;
997 if (!sub_len)
998 asf->return_subpayload = 0;
999
1000 if (sub_len)
1001 asf->nb_sub++;
1002 pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
1003 if (asf->nb_mult_left && (avio_tell(pb) >=
1004 (asf->sub_header_offset + asf->mult_sub_len))) {
1005 asf->sub_left = 0;
1006 asf->nb_mult_left--;
1007 }
1008 if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
1009 asf->sub_left = 0;
1010 if (!asf->nb_mult_left) {
1011 avio_skip(pb, asf->pad_len);
1012 if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
1013 if (!asf->packet_size)
1014 return AVERROR_INVALIDDATA;
1015 av_log(s, AV_LOG_WARNING,
1016 "Position %"PRId64" wrong, should be %"PRId64"\n",
1017 avio_tell(pb), asf->packet_offset + asf->packet_size);
1018 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1019 }
1020 }
1021 }
1022
1023 return 0;
1024 }
1025
1026 static void reset_packet(ASFPacket *asf_pkt)
1027 {
1028 asf_pkt->size_left = 0;
1029 asf_pkt->data_size = 0;
1030 asf_pkt->duration = 0;
1031 asf_pkt->flags = 0;
1032 asf_pkt->dts = 0;
1033 av_packet_unref(asf_pkt->avpkt);
1034 }
1035
1036 static int asf_read_replicated_data(AVFormatContext *s, ASFPacket *asf_pkt)
1037 {
1038 ASFContext *asf = s->priv_data;
1039 AVIOContext *pb = s->pb;
1040 int ret, data_size;
1041
1042 if (!asf_pkt->data_size) {
1043 data_size = avio_rl32(pb); // read media object size
1044 if (data_size <= 0)
1045 return AVERROR_INVALIDDATA;
1046 if ((ret = av_new_packet(asf_pkt->avpkt, data_size)) < 0)
1047 return ret;
1048 asf_pkt->data_size = asf_pkt->size_left = data_size;
1049 } else
1050 avio_skip(pb, 4); // reading of media object size is already done
1051 asf_pkt->dts = avio_rl32(pb); // read presentation time
1052 if (asf->rep_data_len >= 8)
1053 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1054
1055 return 0;
1056 }
1057
1058 static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
1059 ASFPacket *asf_pkt)
1060 {
1061 ASFContext *asf = s->priv_data;
1062 AVIOContext *pb = s->pb;
1063 uint16_t pay_len;
1064 unsigned char *p;
1065 int ret;
1066 int skip = 0;
1067
1068 // if replicated length is 1, subpayloads are present
1069 if (asf->rep_data_len == 1) {
1070 asf->sub_left = 1;
1071 asf->state = READ_MULTI_SUB;
1072 pkt->flags = asf_pkt->flags;
1073 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1074 return ret;
1075 } else {
1076 if (asf->rep_data_len)
1077 if ((ret = asf_read_replicated_data(s, asf_pkt)) < 0)
1078 return ret;
1079 pay_len = avio_rl16(pb); // payload length should be WORD
1080 if (pay_len > asf->packet_size) {
1081 av_log(s, AV_LOG_ERROR,
1082 "Error: invalid data packet size, pay_len %"PRIu16", "
1083 "asf->packet_size %"PRIu32", offset %"PRId64".\n",
1084 pay_len, asf->packet_size, avio_tell(pb));
1085 return AVERROR_INVALIDDATA;
1086 }
1087 p = asf_pkt->avpkt->data + asf_pkt->data_size - asf_pkt->size_left;
1088 if (pay_len > asf_pkt->size_left) {
1089 av_log(s, AV_LOG_ERROR,
1090 "Error: invalid buffer size, pay_len %d, data size left %d.\n",
1091 pay_len, asf_pkt->size_left);
1092 skip = pay_len - asf_pkt->size_left;
1093 pay_len = asf_pkt->size_left;
1094 }
1095 if (asf_pkt->size_left <= 0)
1096 return AVERROR_INVALIDDATA;
1097 if ((ret = avio_read(pb, p, pay_len)) < 0)
1098 return ret;
1099 if (s->key && s->keylen == 20)
1100 ff_asfcrypt_dec(s->key, p, ret);
1101 avio_skip(pb, skip);
1102 asf_pkt->size_left -= pay_len;
1103 asf->nb_mult_left--;
1104 }
1105
1106 return 0;
1107 }
1108
1109 static int asf_read_single_payload(AVFormatContext *s, ASFPacket *asf_pkt)
1110 {
1111 ASFContext *asf = s->priv_data;
1112 AVIOContext *pb = s->pb;
1113 int64_t offset;
1114 uint64_t size;
1115 unsigned char *p;
1116 int ret, data_size;
1117
1118 if (!asf_pkt->data_size) {
1119 data_size = avio_rl32(pb); // read media object size
1120 if (data_size <= 0)
1121 return AVERROR_EOF;
1122 if ((ret = av_new_packet(asf_pkt->avpkt, data_size)) < 0)
1123 return ret;
1124 asf_pkt->data_size = asf_pkt->size_left = data_size;
1125 } else
1126 avio_skip(pb, 4); // skip media object size
1127 asf_pkt->dts = avio_rl32(pb); // read presentation time
1128 if (asf->rep_data_len >= 8)
1129 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1130 offset = avio_tell(pb);
1131
1132 // size of the payload - size of the packet without header and padding
1133 if (asf->packet_size_internal)
1134 size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
1135 else
1136 size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
1137 if (size > asf->packet_size) {
1138 av_log(s, AV_LOG_ERROR,
1139 "Error: invalid data packet size, offset %"PRId64".\n",
1140 avio_tell(pb));
1141 return AVERROR_INVALIDDATA;
1142 }
1143 p = asf_pkt->avpkt->data + asf_pkt->data_size - asf_pkt->size_left;
1144 if (size > asf_pkt->size_left || asf_pkt->size_left <= 0)
1145 return AVERROR_INVALIDDATA;
1146 if (asf_pkt->size_left > size)
1147 asf_pkt->size_left -= size;
1148 else
1149 asf_pkt->size_left = 0;
1150 if ((ret = avio_read(pb, p, size)) < 0)
1151 return ret;
1152 if (s->key && s->keylen == 20)
1153 ff_asfcrypt_dec(s->key, p, ret);
1154 if (asf->packet_size_internal)
1155 avio_skip(pb, asf->packet_size - asf->packet_size_internal);
1156 avio_skip(pb, asf->pad_len); // skip padding
1157
1158 return 0;
1159 }
1160
1161 static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
1162 {
1163 ASFContext *asf = s->priv_data;
1164 AVIOContext *pb = s->pb;
1165 int ret, i;
1166 ASFPacket *asf_pkt = NULL;
1167
1168 if (!asf->sub_left) {
1169 uint32_t off_len, media_len;
1170 uint8_t stream_num;
1171
1172 stream_num = avio_r8(pb);
1173 asf->stream_index = stream_num & ASF_STREAM_NUM;
1174 for (i = 0; i < asf->nb_streams; i++) {
1175 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1176 asf_pkt = &asf->asf_st[i]->pkt;
1177 asf_pkt->stream_index = asf->asf_st[i]->index;
1178 break;
1179 }
1180 }
1181 if (!asf_pkt) {
1182 if (asf->packet_offset + asf->packet_size <= asf->data_offset + asf->data_size) {
1183 if (!asf->packet_size) {
1184 av_log(s, AV_LOG_ERROR, "Invalid packet size 0.\n");
1185 return AVERROR_INVALIDDATA;
1186 }
1187 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1188 av_log(s, AV_LOG_WARNING, "Skipping the stream with the invalid stream index %d.\n",
1189 asf->stream_index);
1190 return AVERROR(EAGAIN);
1191 } else
1192 return AVERROR_INVALIDDATA;
1193 }
1194
1195 if (stream_num >> 7)
1196 asf_pkt->flags |= AV_PKT_FLAG_KEY;
1197 READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
1198 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
1199 READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
1200 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
1201 READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
1202 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
1203 if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
1204 av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
1205 reset_packet(asf_pkt);
1206 }
1207 asf_pkt->frame_num = media_len;
1208 asf->sub_dts = off_len;
1209 if (asf->nb_mult_left) {
1210 if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
1211 return ret;
1212 } else if (asf->rep_data_len == 1) {
1213 asf->sub_left = 1;
1214 asf->state = READ_SINGLE;
1215 pkt->flags = asf_pkt->flags;
1216 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1217 return ret;
1218 } else {
1219 if ((ret = asf_read_single_payload(s, asf_pkt)) < 0)
1220 return ret;
1221 }
1222 } else {
1223 for (i = 0; i <= asf->nb_streams; i++) {
1224 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1225 asf_pkt = &asf->asf_st[i]->pkt;
1226 break;
1227 }
1228 }
1229 if (!asf_pkt)
1230 return AVERROR_INVALIDDATA;
1231 pkt->flags = asf_pkt->flags;
1232 pkt->dts = asf_pkt->dts;
1233 pkt->stream_index = asf->asf_st[i]->index;
1234 if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
1235 return ret;
1236 }
1237
1238 return 0;
1239 }
1240
1241 static int asf_read_packet_header(AVFormatContext *s)
1242 {
1243 ASFContext *asf = s->priv_data;
1244 AVIOContext *pb = s->pb;
1245 uint64_t size;
1246 uint32_t av_unused seq;
1247 unsigned char error_flags, len_flags, pay_flags;
1248
1249 asf->packet_offset = avio_tell(pb);
1250 if (asf->packet_offset > INT64_MAX/2)
1251 asf->packet_offset = 0;
1252 error_flags = avio_r8(pb); // read Error Correction Flags
1253 if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT) {
1254 if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
1255 size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
1256 avio_skip(pb, size);
1257 }
1258 len_flags = avio_r8(pb);
1259 } else
1260 len_flags = error_flags;
1261 asf->prop_flags = avio_r8(pb);
1262 READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
1263 ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
1264 READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
1265 ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
1266 READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
1267 ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
1268 asf->send_time = avio_rl32(pb); // send time
1269 avio_skip(pb, 2); // skip duration
1270 if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
1271 pay_flags = avio_r8(pb);
1272 asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
1273 }
1274
1275 return 0;
1276 }
1277
1278 static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
1279 {
1280 ASFContext *asf = s->priv_data;
1281 ASFStream *asf_st = asf->asf_st[st_num];
1282 unsigned char *p = asf_pkt->avpkt->data;
1283 uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
1284 uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
1285 int nchunks = pkt_len / chunk_len;
1286 uint8_t *data;
1287 int pos = 0, j, l, ret;
1288
1289
1290 data = av_malloc(asf_pkt->data_size + AV_INPUT_BUFFER_PADDING_SIZE);
1291 if (!data)
1292 return AVERROR(ENOMEM);
1293 memset(data + asf_pkt->data_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1294
1295 while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
1296 if (pos >= asf_pkt->data_size) {
1297 break;
1298 }
1299 for (l = 0; l < pkt_len; l++) {
1300 if (pos >= asf_pkt->data_size) {
1301 break;
1302 }
1303 for (j = 0; j < asf_st->span; j++) {
1304 if ((pos + chunk_len) >= asf_pkt->data_size)
1305 break;
1306 memcpy(data + pos,
1307 p + (j * nchunks + l) * chunk_len,
1308 chunk_len);
1309 pos += chunk_len;
1310 }
1311 }
1312 p += asf_st->span * pkt_len;
1313 if (p > asf_pkt->avpkt->data + asf_pkt->data_size)
1314 break;
1315 }
1316 av_packet_unref(asf_pkt->avpkt);
1317 ret = av_packet_from_data(asf_pkt->avpkt, data, asf_pkt->data_size);
1318 if (ret < 0)
1319 av_free(data);
1320
1321 return ret;
1322 }
1323
1324 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1325 {
1326 ASFContext *asf = s->priv_data;
1327 AVIOContext *pb = s->pb;
1328 int ret, i;
1329
1330 if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
1331 !(asf->b_flags & ASF_FLAG_BROADCAST))
1332 return AVERROR_EOF;
1333 while (!pb->eof_reached) {
1334 if (asf->state == PARSE_PACKET_HEADER) {
1335 asf_read_packet_header(s);
1336 if (pb->eof_reached)
1337 break;
1338 if (!asf->nb_mult_left)
1339 asf->state = READ_SINGLE;
1340 else
1341 asf->state = READ_MULTI;
1342 }
1343 ret = asf_read_payload(s, pkt);
1344 if (ret == AVERROR(EAGAIN)) {
1345 asf->state = PARSE_PACKET_HEADER;
1346 continue;
1347 }
1348 else if (ret < 0)
1349 return ret;
1350
1351 switch (asf->state) {
1352 case READ_SINGLE:
1353 if (!asf->sub_left)
1354 asf->state = PARSE_PACKET_HEADER;
1355 break;
1356 case READ_MULTI_SUB:
1357 if (!asf->sub_left && !asf->nb_mult_left) {
1358 asf->state = PARSE_PACKET_HEADER;
1359 if (!asf->return_subpayload &&
1360 (avio_tell(pb) <= asf->packet_offset +
1361 asf->packet_size - asf->pad_len))
1362 avio_skip(pb, asf->pad_len); // skip padding
1363 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1364 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1365 } else if (!asf->sub_left)
1366 asf->state = READ_MULTI;
1367 break;
1368 case READ_MULTI:
1369 if (!asf->nb_mult_left) {
1370 asf->state = PARSE_PACKET_HEADER;
1371 if (!asf->return_subpayload &&
1372 (avio_tell(pb) <= asf->packet_offset +
1373 asf->packet_size - asf->pad_len))
1374 avio_skip(pb, asf->pad_len); // skip padding
1375 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1376 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1377 }
1378 break;
1379 }
1380 if (asf->return_subpayload) {
1381 asf->return_subpayload = 0;
1382 return 0;
1383 }
1384 for (i = 0; i < asf->nb_streams; i++) {
1385 ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
1386 if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
1387 if (asf->asf_st[i]->span > 1 &&
1388 asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
1389 if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
1390 return ret;
1391 av_packet_move_ref(pkt, asf_pkt->avpkt);
1392 pkt->stream_index = asf->asf_st[i]->index;
1393 pkt->flags = asf_pkt->flags;
1394 pkt->dts = asf_pkt->dts - asf->preroll;
1395 asf_pkt->data_size = 0;
1396 asf_pkt->frame_num = 0;
1397 return 0;
1398 }
1399 }
1400 }
1401
1402 if (pb->eof_reached)
1403 return AVERROR_EOF;
1404
1405 return 0;
1406 }
1407
1408 static int asf_read_close(AVFormatContext *s)
1409 {
1410 ASFContext *asf = s->priv_data;
1411 int i;
1412
1413 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1414 av_dict_free(&asf->asf_sd[i].asf_met);
1415 if (i < asf->nb_streams) {
1416 av_packet_free(&asf->asf_st[i]->pkt.avpkt);
1417 av_freep(&asf->asf_st[i]);
1418 }
1419 }
1420
1421 asf->nb_streams = 0;
1422 return 0;
1423 }
1424
1425 static void reset_packet_state(AVFormatContext *s)
1426 {
1427 ASFContext *asf = s->priv_data;
1428 int i;
1429
1430 asf->state = PARSE_PACKET_HEADER;
1431 asf->offset = 0;
1432 asf->return_subpayload = 0;
1433 asf->sub_left = 0;
1434 asf->sub_header_offset = 0;
1435 asf->packet_offset = asf->first_packet_offset;
1436 asf->pad_len = 0;
1437 asf->rep_data_len = 0;
1438 asf->dts_delta = 0;
1439 asf->mult_sub_len = 0;
1440 asf->nb_mult_left = 0;
1441 asf->nb_sub = 0;
1442 asf->prop_flags = 0;
1443 asf->sub_dts = 0;
1444 for (i = 0; i < asf->nb_streams; i++) {
1445 ASFPacket *pkt = &asf->asf_st[i]->pkt;
1446 reset_packet(pkt);
1447 }
1448 }
1449
1450 /*
1451 * Find a timestamp for the requested position within the payload
1452 * where the pos (position) is the offset inside the Data Object.
1453 * When position is not on the packet boundary, asf_read_timestamp tries
1454 * to find the closest packet offset after this position. If this packet
1455 * is a key frame, this packet timestamp is read and an index entry is created
1456 * for the packet. If this packet belongs to the requested stream,
1457 * asf_read_timestamp upgrades pos to the packet beginning offset and
1458 * returns this packet's dts. So returned dts is the dts of the first key frame with
1459 * matching stream number after given position.
1460 */
1461 static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
1462 int64_t *pos, int64_t pos_limit)
1463 {
1464 ASFContext *asf = s->priv_data;
1465 int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
1466 AVPacket *pkt = av_packet_alloc();
1467 int n;
1468
1469 if (!pkt)
1470 return AVERROR(ENOMEM);
1471
1472 data_end = asf->data_offset + asf->data_size;
1473
1474 n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
1475 asf->packet_size;
1476 n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
1477 pkt_pos = asf->first_packet_offset + n * asf->packet_size;
1478
1479 avio_seek(s->pb, pkt_pos, SEEK_SET);
1480 pkt_offset = pkt_pos;
1481
1482 reset_packet_state(s);
1483 while (avio_tell(s->pb) < data_end) {
1484
1485 int i, ret, st_found;
1486
1487 pkt_offset = avio_tell(s->pb);
1488 if ((ret = asf_read_packet(s, pkt)) < 0) {
1489 av_packet_free(&pkt);
1490 dts = AV_NOPTS_VALUE;
1491 return ret;
1492 }
1493 // ASFPacket may contain fragments of packets belonging to different streams,
1494 // pkt_offset is the offset of the first fragment within it.
1495 if ((pkt_offset >= (pkt_pos + asf->packet_size)))
1496 pkt_pos += asf->packet_size;
1497 for (i = 0; i < asf->nb_streams; i++) {
1498 ASFStream *st = asf->asf_st[i];
1499
1500 st_found = 0;
1501 if (pkt->flags & AV_PKT_FLAG_KEY) {
1502 dts = pkt->dts;
1503 if (dts) {
1504 av_add_index_entry(s->streams[pkt->stream_index], pkt_pos,
1505 dts, pkt->size, 0, AVINDEX_KEYFRAME);
1506 if (stream_index == st->index) {
1507 st_found = 1;
1508 break;
1509 }
1510 }
1511 }
1512 }
1513 if (st_found)
1514 break;
1515 av_packet_unref(pkt);
1516 }
1517 *pos = pkt_pos;
1518
1519 av_packet_free(&pkt);
1520 return dts;
1521 }
1522
1523 static int asf_read_seek(AVFormatContext *s, int stream_index,
1524 int64_t timestamp, int flags)
1525 {
1526 ASFContext *asf = s->priv_data;
1527 AVStream *const st = s->streams[stream_index];
1528 FFStream *const sti = ffstream(st);
1529 int idx, ret;
1530
1531 if (sti->nb_index_entries && asf->is_simple_index) {
1532 idx = av_index_search_timestamp(st, timestamp, flags);
1533 if (idx < 0 || idx >= sti->nb_index_entries)
1534 return AVERROR_INVALIDDATA;
1535 avio_seek(s->pb, sti->index_entries[idx].pos, SEEK_SET);
1536 } else {
1537 if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
1538 return ret;
1539 }
1540
1541 reset_packet_state(s);
1542
1543 return 0;
1544 }
1545
1546 static const GUIDParseTable *find_guid(ff_asf_guid guid)
1547 {
1548 int j, ret;
1549 const GUIDParseTable *g;
1550
1551 swap_guid(guid);
1552 g = gdef;
1553 for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
1554 if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
1555 return g;
1556 g++;
1557 }
1558
1559 return NULL;
1560 }
1561
1562 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
1563 {
1564 ASFContext *asf = s->priv_data;
1565 AVIOContext *pb = s->pb;
1566 const GUIDParseTable *g = NULL;
1567 ff_asf_guid guid;
1568 int ret;
1569
1570 if (offset > INT64_MAX - size)
1571 return AVERROR_INVALIDDATA;
1572
1573 while (avio_tell(pb) <= offset + size) {
1574 if (avio_tell(pb) == asf->offset)
1575 break;
1576 asf->offset = avio_tell(pb);
1577 if ((ret = ff_get_guid(pb, &guid)) < 0)
1578 return ret;
1579 g = find_guid(guid);
1580 if (g) {
1581 if ((ret = g->read_object(s, g)) < 0)
1582 return ret;
1583 } else {
1584 GUIDParseTable g2;
1585
1586 g2.name = "Unknown";
1587 g2.is_subobject = 1;
1588 asf_read_unknown(s, &g2);
1589 }
1590 }
1591
1592 return 0;
1593 }
1594
1595 static int asf_read_header(AVFormatContext *s)
1596 {
1597 ASFContext *asf = s->priv_data;
1598 AVIOContext *pb = s->pb;
1599 const GUIDParseTable *g = NULL;
1600 ff_asf_guid guid;
1601 int i, ret;
1602 uint64_t size;
1603
1604 asf->preroll = 0;
1605 asf->is_simple_index = 0;
1606 ff_get_guid(pb, &guid);
1607 if (ff_guidcmp(&guid, &ff_asf_header))
1608 return AVERROR_INVALIDDATA;
1609 avio_skip(pb, 8); // skip header object size
1610 avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
1611 asf->data_reached = 0;
1612
1613 /* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
1614 * for the first time,
1615 * Index object is processed and got eof and then seeking back to the Data is performed.
1616 */
1617 while (1) {
1618 // for the cases when object size is invalid
1619 if (avio_tell(pb) == asf->offset)
1620 break;
1621 asf->offset = avio_tell(pb);
1622 if ((ret = ff_get_guid(pb, &guid)) < 0) {
1623 if (ret == AVERROR_EOF && asf->data_reached)
1624 break;
1625 else
1626 goto failed;
1627 }
1628 g = find_guid(guid);
1629 if (g) {
1630 asf->unknown_offset = asf->offset;
1631 asf->is_header = 1;
1632 if ((ret = g->read_object(s, g)) < 0)
1633 goto failed;
1634 } else {
1635 size = avio_rl64(pb);
1636 align_position(pb, asf->offset, size);
1637 }
1638 if (asf->data_reached &&
1639 (!(pb->seekable & AVIO_SEEKABLE_NORMAL) ||
1640 (asf->b_flags & ASF_FLAG_BROADCAST)))
1641 break;
1642 }
1643
1644 if (!asf->data_reached) {
1645 av_log(s, AV_LOG_ERROR, "Data Object was not found.\n");
1646 ret = AVERROR_INVALIDDATA;
1647 goto failed;
1648 }
1649 if (pb->seekable & AVIO_SEEKABLE_NORMAL)
1650 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1651
1652 for (i = 0; i < asf->nb_streams; i++) {
1653 const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
1654 AVStream *st = s->streams[asf->asf_st[i]->index];
1655 set_language(s, rfc1766, &st->metadata);
1656 }
1657
1658 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1659 AVStream *st = NULL;
1660
1661 st = find_stream(s, i);
1662 if (st) {
1663 av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
1664 if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
1665 st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
1666 st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
1667 }
1668 }
1669 }
1670
1671 return 0;
1672
1673 failed:
1674 asf_read_close(s);
1675 return ret;
1676 }
1677
1678 const FFInputFormat ff_asf_o_demuxer = {
1679 .p.name = "asf_o",
1680 .p.long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1681 .p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1682 .priv_data_size = sizeof(ASFContext),
1683 .read_probe = asf_probe,
1684 .read_header = asf_read_header,
1685 .read_packet = asf_read_packet,
1686 .read_close = asf_read_close,
1687 .read_timestamp = asf_read_timestamp,
1688 .read_seek = asf_read_seek,
1689 };
1690