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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 "libavutil/attributes.h"
23#include "libavutil/avstring.h"
24#include "libavutil/bswap.h"
25#include "libavutil/common.h"
26#include "libavutil/dict.h"
27#include "libavutil/internal.h"
28#include "libavutil/mathematics.h"
29#include "libavutil/opt.h"
30#include "libavutil/time_internal.h"
31
32#include "avformat.h"
33#include "avio_internal.h"
34#include "avlanguage.h"
35#include "id3v2.h"
36#include "internal.h"
37#include "riff.h"
38#include "asf.h"
39#include "asfcrypt.h"
40
41#define ASF_BOOL 0x2
42#define ASF_WORD 0x5
43#define ASF_GUID 0x6
44#define ASF_DWORD 0x3
45#define ASF_QWORD 0x4
46#define ASF_UNICODE 0x0
47#define ASF_FLAG_BROADCAST 0x1
48#define ASF_BYTE_ARRAY 0x1
49#define ASF_TYPE_AUDIO 0x2
50#define ASF_TYPE_VIDEO 0x1
51#define ASF_STREAM_NUM 0x7F
52#define ASF_MAX_STREAMS 128
53#define BMP_HEADER_SIZE 40
54#define ASF_NUM_OF_PAYLOADS 0x3F
55#define ASF_ERROR_CORRECTION_LENGTH_TYPE 0x60
56#define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
57
58typedef struct GUIDParseTable {
59 const char *name;
60 ff_asf_guid guid;
61 int (*read_object)(AVFormatContext *, const struct GUIDParseTable *);
62 int is_subobject;
63} GUIDParseTable;
64
65typedef struct ASFPacket {
66 AVPacket avpkt;
67 int64_t dts;
68 uint32_t frame_num; // ASF payloads with the same number are parts of the same frame
69 int flags;
70 int data_size;
71 int duration;
72 int size_left;
73 uint8_t stream_index;
74} ASFPacket;
75
76typedef struct ASFStream {
77 uint8_t stream_index; // from packet header
78 int index; // stream index in AVFormatContext, set in asf_read_stream_properties
79 int type;
80 int indexed; // added index entries from the Simple Index Object or not
81 int8_t span; // for deinterleaving
82 uint16_t virtual_pkt_len;
83 uint16_t virtual_chunk_len;
84 int16_t lang_idx;
85 ASFPacket pkt;
86} ASFStream;
87
88typedef struct ASFStreamData{
89 char langs[32];
90 AVDictionary *asf_met; // for storing per-stream metadata
91 AVRational aspect_ratio;
92} ASFStreamData;
93
94typedef struct ASFContext {
95 int data_reached;
96 int is_simple_index; // is simple index present or not 1/0
97 int is_header;
98
99 uint64_t preroll;
100 uint64_t nb_packets; // ASF packets
101 uint32_t packet_size;
102 int64_t send_time;
103 int duration;
104
105 uint32_t b_flags; // flags with broadcast flag
106 uint32_t prop_flags; // file properties object flags
107
108 uint64_t data_size; // data object size
109 uint64_t unknown_size; // size of the unknown object
110
111 int64_t offset; // offset of the current object
112
113 int64_t data_offset;
114 int64_t first_packet_offset; // packet offset
115 int64_t unknown_offset; // for top level header objects or subobjects without specified behavior
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
147static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size);
148static const GUIDParseTable *find_guid(ff_asf_guid guid);
149
150static int asf_probe(AVProbeData *pd)
151{
152 /* check file header */
153 if (!ff_guidcmp(pd->buf, &ff_asf_header))
154 return AVPROBE_SCORE_MAX/2;
155 else
156 return 0;
157}
158
159static 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
167static 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
173static 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)
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 if ((ret = detect_unknown_subobject(s, asf->unknown_offset,
190 asf->unknown_size)) < 0)
191 return ret;
192 } else {
193 if (size < 24) {
194 av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
195 return AVERROR_INVALIDDATA;
196 }
197 avio_skip(pb, size - 24);
198 }
199
200 return 0;
201}
202
203static int get_asf_string(AVIOContext *pb, int maxlen, char *buf, int buflen)
204{
205 char *q = buf;
206 int ret = 0;
207 if (buflen <= 0)
208 return AVERROR(EINVAL);
209 while (ret + 1 < maxlen) {
210 uint8_t tmp;
211 uint32_t ch;
212 GET_UTF16(ch, (ret += 2) <= maxlen ? avio_rl16(pb) : 0, break;);
213 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)
214 }
215 *q = 0;
216
217 return ret;
218}
219
220static int asf_read_marker(AVFormatContext *s, const GUIDParseTable *g)
221{
222 ASFContext *asf = s->priv_data;
223 AVIOContext *pb = s->pb;
224 uint64_t size = avio_rl64(pb);
225 int i, nb_markers, ret;
226 size_t len;
227 char name[1024];
228
229 avio_skip(pb, 8);
230 avio_skip(pb, 8); // skip reserved GUID
231 nb_markers = avio_rl32(pb);
232 avio_skip(pb, 2); // skip reserved field
233 len = avio_rl16(pb);
234 for (i = 0; i < len; i++)
235 avio_skip(pb, 1);
236
237 for (i = 0; i < nb_markers; i++) {
238 int64_t pts;
239
240 avio_skip(pb, 8);
241 pts = avio_rl64(pb);
242 pts -= asf->preroll * 10000;
243 avio_skip(pb, 2); // entry length
244 avio_skip(pb, 4); // send time
245 avio_skip(pb, 4); // flags
246 len = avio_rl32(pb);
247
248 if ((ret = avio_get_str16le(pb, len, name,
249 sizeof(name))) < len)
250 avio_skip(pb, len - ret);
251 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pts,
252 AV_NOPTS_VALUE, name);
253 }
254 align_position(pb, asf->offset, size);
255
256 return 0;
257}
258
259static int asf_read_metadata(AVFormatContext *s, const char *title, uint16_t len,
260 unsigned char *ch, uint16_t buflen)
261{
262 AVIOContext *pb = s->pb;
263
264 avio_get_str16le(pb, len, ch, buflen);
265 if (ch[0]) {
266 if (av_dict_set(&s->metadata, title, ch, 0) < 0)
267 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
268 }
269
270 return 0;
271}
272
273static int asf_read_value(AVFormatContext *s, const uint8_t *name,
274 uint16_t val_len, int type, AVDictionary **met)
275{
276 int ret;
277 uint8_t *value;
278 uint16_t buflen = 2 * val_len + 1;
279 AVIOContext *pb = s->pb;
280
281 value = av_malloc(buflen);
282 if (!value)
283 return AVERROR(ENOMEM);
284 if (type == ASF_UNICODE) {
285 // get_asf_string reads UTF-16 and converts it to UTF-8 which needs longer buffer
286 if ((ret = get_asf_string(pb, val_len, value, buflen)) < 0)
287 goto failed;
288 if (av_dict_set(met, name, value, 0) < 0)
289 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
290 } else {
291 char buf[256];
292 if (val_len > sizeof(buf)) {
293 ret = AVERROR_INVALIDDATA;
294 goto failed;
295 }
296 if ((ret = avio_read(pb, value, val_len)) < 0)
297 goto failed;
298 if (ret < 2 * val_len)
299 value[ret] = '\0';
300 else
301 value[2 * val_len - 1] = '\0';
302 snprintf(buf, sizeof(buf), "%s", value);
303 if (av_dict_set(met, name, buf, 0) < 0)
304 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
305 }
306 av_freep(&value);
307
308 return 0;
309
310failed:
311 av_freep(&value);
312 return ret;
313}
314static int asf_read_generic_value(AVIOContext *pb, int type, uint64_t *value)
315{
316
317 switch (type) {
318 case ASF_BOOL:
319 *value = avio_rl16(pb);
320 break;
321 case ASF_DWORD:
322 *value = avio_rl32(pb);
323 break;
324 case ASF_QWORD:
325 *value = avio_rl64(pb);
326 break;
327 case ASF_WORD:
328 *value = avio_rl16(pb);
329 break;
330 default:
331 return AVERROR_INVALIDDATA;
332 }
333
334 return 0;
335}
336
337static int asf_set_metadata(AVFormatContext *s, const uint8_t *name,
338 int type, AVDictionary **met)
339{
340 AVIOContext *pb = s->pb;
341 uint64_t value;
342 char buf[32];
343 int ret;
344
345 ret = asf_read_generic_value(pb, type, &value);
346 if (ret < 0)
347 return ret;
348
349 snprintf(buf, sizeof(buf), "%"PRIu64, value);
350 if (av_dict_set(met, name, buf, 0) < 0)
351 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
352
353 return 0;
354}
355
356/* MSDN claims that this should be "compatible with the ID3 frame, APIC",
357 * but in reality this is only loosely similar */
358static int asf_read_picture(AVFormatContext *s, int len)
359{
360 ASFContext *asf = s->priv_data;
361 AVPacket pkt = { 0 };
362 const CodecMime *mime = ff_id3v2_mime_tags;
363 enum AVCodecID id = AV_CODEC_ID_NONE;
364 char mimetype[64];
365 uint8_t *desc = NULL;
366 AVStream *st = NULL;
367 int ret, type, picsize, desc_len;
368 ASFStream *asf_st;
369
370 /* type + picsize + mime + desc */
371 if (len < 1 + 4 + 2 + 2) {
372 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
373 return AVERROR_INVALIDDATA;
374 }
375
376 /* picture type */
377 type = avio_r8(s->pb);
378 len--;
379 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
380 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
381 type = 0;
382 }
383
384 /* picture data size */
385 picsize = avio_rl32(s->pb);
386 len -= 4;
387
388 /* picture MIME type */
389 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
390 while (mime->id != AV_CODEC_ID_NONE) {
391 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
392 id = mime->id;
393 break;
394 }
395 mime++;
396 }
397 if (id == AV_CODEC_ID_NONE) {
398 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
399 mimetype);
400 return 0;
401 }
402
403 if (picsize >= len) {
404 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
405 picsize, len);
406 return AVERROR_INVALIDDATA;
407 }
408
409 /* picture description */
410 desc_len = (len - picsize) * 2 + 1;
411 desc = av_malloc(desc_len);
412 if (!desc)
413 return AVERROR(ENOMEM);
414 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
415
416 ret = av_get_packet(s->pb, &pkt, picsize);
417 if (ret < 0)
418 goto fail;
419
420 st = avformat_new_stream(s, NULL);
421 if (!st) {
422 ret = AVERROR(ENOMEM);
423 goto fail;
424 }
425 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
426 asf_st = asf->asf_st[asf->nb_streams];
427 if (!asf_st) {
428 ret = AVERROR(ENOMEM);
429 goto fail;
430 }
431
432 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
433 st->codecpar->codec_type = asf_st->type = AVMEDIA_TYPE_VIDEO;
434 st->codecpar->codec_id = id;
435 st->attached_pic = pkt;
436 st->attached_pic.stream_index = asf_st->index = st->index;
437 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
438
439 asf->nb_streams++;
440
441 if (*desc) {
442 if (av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL) < 0)
443 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
444 } else
445 av_freep(&desc);
446
447 if (av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0) < 0)
448 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
449
450 return 0;
451
452fail:
453 av_freep(&desc);
454 av_packet_unref(&pkt);
455 return ret;
456}
457
458static void get_id3_tag(AVFormatContext *s, int len)
459{
460 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
461
462 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
463 if (id3v2_extra_meta)
464 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
465 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
466}
467
468static int process_metadata(AVFormatContext *s, const uint8_t *name, uint16_t name_len,
469 uint16_t val_len, uint16_t type, AVDictionary **met)
470{
471 int ret;
472 ff_asf_guid guid;
473
474 if (val_len) {
475 switch (type) {
476 case ASF_UNICODE:
477 asf_read_value(s, name, val_len, type, met);
478 break;
479 case ASF_BYTE_ARRAY:
480 if (!strcmp(name, "WM/Picture")) // handle cover art
481 asf_read_picture(s, val_len);
482 else if (!strcmp(name, "ID3")) // handle ID3 tag
483 get_id3_tag(s, val_len);
484 else
485 asf_read_value(s, name, val_len, type, met);
486 break;
487 case ASF_GUID:
488 ff_get_guid(s->pb, &guid);
489 break;
490 default:
491 if ((ret = asf_set_metadata(s, name, type, met)) < 0)
492 return ret;
493 break;
494 }
495 }
496
497 return 0;
498}
499
500static int asf_read_ext_content(AVFormatContext *s, const GUIDParseTable *g)
501{
502 ASFContext *asf = s->priv_data;
503 AVIOContext *pb = s->pb;
504 uint64_t size = avio_rl64(pb);
505 uint16_t nb_desc = avio_rl16(pb);
506 int i, ret;
507
508 for (i = 0; i < nb_desc; i++) {
509 uint16_t name_len, type, val_len;
510 uint8_t *name = NULL;
511
512 name_len = avio_rl16(pb);
513 if (!name_len)
514 return AVERROR_INVALIDDATA;
515 name = av_malloc(name_len);
516 if (!name)
517 return AVERROR(ENOMEM);
518 avio_get_str16le(pb, name_len, name,
519 name_len);
520 type = avio_rl16(pb);
521 // BOOL values are 16 bits long in the Metadata Object
522 // but 32 bits long in the Extended Content Description Object
523 if (type == ASF_BOOL)
524 type = ASF_DWORD;
525 val_len = avio_rl16(pb);
526
527 ret = process_metadata(s, name, name_len, val_len, type, &s->metadata);
528 av_freep(&name);
529 if (ret < 0)
530 return ret;
531 }
532
533 align_position(pb, asf->offset, size);
534 return 0;
535}
536
537static AVStream *find_stream(AVFormatContext *s, uint16_t st_num)
538{
539 AVStream *st = NULL;
540 ASFContext *asf = s->priv_data;
541 int i;
542
543 for (i = 0; i < asf->nb_streams; i++) {
544 if (asf->asf_st[i]->stream_index == st_num) {
545 st = s->streams[asf->asf_st[i]->index];
546 break;
547 }
548 }
549
550 return st;
551}
552
553static int asf_store_aspect_ratio(AVFormatContext *s, uint8_t st_num, uint8_t *name, int type)
554{
555 ASFContext *asf = s->priv_data;
556 AVIOContext *pb = s->pb;
557 uint64_t value = 0;
558 int ret;
559
560 ret = asf_read_generic_value(pb, type, &value);
561 if (ret < 0)
562 return ret;
563
564 if (st_num < ASF_MAX_STREAMS) {
565 if (!strcmp(name, "AspectRatioX"))
566 asf->asf_sd[st_num].aspect_ratio.num = value;
567 else
568 asf->asf_sd[st_num].aspect_ratio.den = value;
569 }
570 return 0;
571}
572
573static int asf_read_metadata_obj(AVFormatContext *s, const GUIDParseTable *g)
574{
575 ASFContext *asf = s->priv_data;
576 AVIOContext *pb = s->pb;
577 uint64_t size = avio_rl64(pb);
578 uint16_t nb_recs = avio_rl16(pb); // number of records in the Description Records list
579 int i, ret;
580
581 for (i = 0; i < nb_recs; i++) {
582 uint16_t name_len, buflen, type, val_len, st_num;
583 uint8_t *name = NULL;
584
585 avio_skip(pb, 2); // skip reserved field
586 st_num = avio_rl16(pb);
587 name_len = avio_rl16(pb);
588 buflen = 2 * name_len + 1;
589 if (!name_len)
590 break;
591 type = avio_rl16(pb);
592 val_len = avio_rl32(pb);
593 name = av_malloc(buflen);
594 if (!name)
595 return AVERROR(ENOMEM);
596 avio_get_str16le(pb, name_len, name,
597 buflen);
598 if (!strcmp(name, "AspectRatioX") || !strcmp(name, "AspectRatioY")) {
599 ret = asf_store_aspect_ratio(s, st_num, name, type);
600 if (ret < 0) {
601 av_freep(&name);
602 break;
603 }
604 } else {
605 if (st_num < ASF_MAX_STREAMS) {
606 if ((ret = process_metadata(s, name, name_len, val_len, type,
607 &asf->asf_sd[st_num].asf_met)) < 0) {
608 av_freep(&name);
609 break;
610 }
611 }
612 }
613 av_freep(&name);
614 }
615
616 align_position(pb, asf->offset, size);
617 return 0;
618}
619
620static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
621{
622 ASFContext *asf = s->priv_data;
623 AVIOContext *pb = s->pb;
624 int i;
625 static const char *const titles[] =
626 { "Title", "Author", "Copyright", "Description", "Rate" };
627 uint16_t len[5], buflen[5] = { 0 };
628 uint8_t *ch;
629 uint64_t size = avio_rl64(pb);
630
631 for (i = 0; i < 5; i++) {
632 len[i] = avio_rl16(pb);
633 // utf8 string should be <= 2 * utf16 string, extra byte for the terminator
634 buflen[i] = 2 * len[i] + 1;
635 }
636
637 for (i = 0; i < 5; i++) {
638 ch = av_malloc(buflen[i]);
639 if (!ch)
640 return(AVERROR(ENOMEM));
641 asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
642 av_freep(&ch);
643 }
644 align_position(pb, asf->offset, size);
645
646 return 0;
647}
648
649static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
650{
651 ASFContext *asf = s->priv_data;
652 AVIOContext *pb = s->pb;
653 time_t creation_time;
654
655 avio_rl64(pb); // read object size
656 avio_skip(pb, 16); // skip File ID
657 avio_skip(pb, 8); // skip File size
658 creation_time = avio_rl64(pb);
659 if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
660 struct tm tmbuf;
661 struct tm *tm;
662 char buf[64];
663
664 // creation date is in 100 ns units from 1 Jan 1601, conversion to s
665 creation_time /= 10000000;
666 // there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
667 creation_time -= 11644473600;
668 tm = gmtime_r(&creation_time, &tmbuf);
669 if (tm) {
670 if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
671 buf[0] = '\0';
672 } else
673 buf[0] = '\0';
674 if (buf[0]) {
675 if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
676 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
677 }
678 }
679 asf->nb_packets = avio_rl64(pb);
680 asf->duration = avio_rl64(pb) / 10000; // stream duration
681 avio_skip(pb, 8); // skip send duration
682 asf->preroll = avio_rl64(pb);
683 asf->duration -= asf->preroll;
684 asf->b_flags = avio_rl32(pb);
685 avio_skip(pb, 4); // skip minimal packet size
686 asf->packet_size = avio_rl32(pb);
687 avio_skip(pb, 4); // skip max_bitrate
688
689 return 0;
690}
691
692static int parse_video_info(AVIOContext *pb, AVStream *st)
693{
694 uint16_t size;
695 unsigned int tag;
696
697 st->codecpar->width = avio_rl32(pb);
698 st->codecpar->height = avio_rl32(pb);
699 avio_skip(pb, 1); // skip reserved flags
700 size = avio_rl16(pb); // size of the Format Data
701 tag = ff_get_bmp_header(pb, st, NULL);
702 st->codecpar->codec_tag = tag;
703 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
704
705 if (size > BMP_HEADER_SIZE) {
706 int ret;
707 st->codecpar->extradata_size = size - BMP_HEADER_SIZE;
708 if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size +
709 AV_INPUT_BUFFER_PADDING_SIZE))) {
710 st->codecpar->extradata_size = 0;
711 return AVERROR(ENOMEM);
712 }
713 memset(st->codecpar->extradata + st->codecpar->extradata_size , 0,
714 AV_INPUT_BUFFER_PADDING_SIZE);
715 if ((ret = avio_read(pb, st->codecpar->extradata,
716 st->codecpar->extradata_size)) < 0)
717 return ret;
718 }
719 return 0;
720}
721
722static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
723{
724 ASFContext *asf = s->priv_data;
725 AVIOContext *pb = s->pb;
726 uint64_t size;
727 uint32_t err_data_len, ts_data_len; // type specific data length
728 uint16_t flags;
729 ff_asf_guid stream_type;
730 enum AVMediaType type;
731 int i, ret;
732 uint8_t stream_index;
733 AVStream *st;
734 ASFStream *asf_st;
735
736 // ASF file must not contain more than 128 streams according to the specification
737 if (asf->nb_streams >= ASF_MAX_STREAMS)
738 return AVERROR_INVALIDDATA;
739
740 size = avio_rl64(pb);
741 ff_get_guid(pb, &stream_type);
742 if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
743 type = AVMEDIA_TYPE_AUDIO;
744 else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
745 type = AVMEDIA_TYPE_VIDEO;
746 else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
747 type = AVMEDIA_TYPE_VIDEO;
748 else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
749 type = AVMEDIA_TYPE_DATA;
750 else if (!ff_guidcmp(&stream_type,
751 &ff_asf_ext_stream_embed_stream_header))
752 type = AVMEDIA_TYPE_UNKNOWN;
753 else
754 return AVERROR_INVALIDDATA;
755
756 ff_get_guid(pb, &stream_type); // error correction type
757 avio_skip(pb, 8); // skip the time offset
758 ts_data_len = avio_rl32(pb);
759 err_data_len = avio_rl32(pb);
760 flags = avio_rl16(pb); // bit 15 - Encrypted Content
761
762 stream_index = flags & ASF_STREAM_NUM;
763 for (i = 0; i < asf->nb_streams; i++)
764 if (stream_index == asf->asf_st[i]->stream_index) {
765 av_log(s, AV_LOG_WARNING,
766 "Duplicate stream found, this stream will be ignored.\n");
767 align_position(pb, asf->offset, size);
768 return 0;
769 }
770
771 st = avformat_new_stream(s, NULL);
772 if (!st)
773 return AVERROR(ENOMEM);
774 avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
775 st->codecpar->codec_type = type;
776 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
777 if (!asf->asf_st[asf->nb_streams])
778 return AVERROR(ENOMEM);
779 asf_st = asf->asf_st[asf->nb_streams];
780 asf->nb_streams++;
781 asf_st->stream_index = stream_index;
782 asf_st->index = st->index;
783 asf_st->indexed = 0;
784 st->id = flags & ASF_STREAM_NUM;
785 av_init_packet(&asf_st->pkt.avpkt);
786 asf_st->pkt.data_size = 0;
787 avio_skip(pb, 4); // skip reserved field
788
789 switch (type) {
790 case AVMEDIA_TYPE_AUDIO:
791 asf_st->type = AVMEDIA_TYPE_AUDIO;
792 if ((ret = ff_get_wav_header(s, pb, st->codecpar, ts_data_len, 0)) < 0)
793 return ret;
794 break;
795 case AVMEDIA_TYPE_VIDEO:
796 asf_st->type = AVMEDIA_TYPE_VIDEO;
797 if ((ret = parse_video_info(pb, st)) < 0)
798 return ret;
799 break;
800 default:
801 avio_skip(pb, ts_data_len);
802 break;
803 }
804
805 if (err_data_len) {
806 if (type == AVMEDIA_TYPE_AUDIO) {
807 uint8_t span = avio_r8(pb);
808 if (span > 1) {
809 asf_st->span = span;
810 asf_st->virtual_pkt_len = avio_rl16(pb);
811 asf_st->virtual_chunk_len = avio_rl16(pb);
812 if (!asf_st->virtual_chunk_len || !asf_st->virtual_pkt_len)
813 return AVERROR_INVALIDDATA;
814 avio_skip(pb, err_data_len - 5);
815 } else
816 avio_skip(pb, err_data_len - 1);
817 } else
818 avio_skip(pb, err_data_len);
819 }
820
821 align_position(pb, asf->offset, size);
822
823 return 0;
824}
825
826static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
827{
828 // language abbr should contain at least 2 chars
829 if (rfc1766 && strlen(rfc1766) > 1) {
830 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
831 const char *iso6392 = ff_convert_lang_to(primary_tag,
832 AV_LANG_ISO639_2_BIBL);
833 if (iso6392)
834 if (av_dict_set(met, "language", iso6392, 0) < 0)
835 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
836 }
837}
838
839static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
840{
841 ASFContext *asf = s->priv_data;
842 AVIOContext *pb = s->pb;
843 AVStream *st = NULL;
844 ff_asf_guid guid;
845 uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
846 int i, ret;
847 uint32_t bitrate;
848 uint64_t start_time, end_time, time_per_frame;
849 uint64_t size = avio_rl64(pb);
850
851 start_time = avio_rl64(pb);
852 end_time = avio_rl64(pb);
853 bitrate = avio_rl32(pb);
854 avio_skip(pb, 28); // skip some unused values
855 st_num = avio_rl16(pb);
856 st_num &= ASF_STREAM_NUM;
857 lang_idx = avio_rl16(pb); // Stream Language ID Index
858 for (i = 0; i < asf->nb_streams; i++) {
859 if (st_num == asf->asf_st[i]->stream_index) {
860 st = s->streams[asf->asf_st[i]->index];
861 asf->asf_st[i]->lang_idx = lang_idx;
862 break;
863 }
864 }
865 time_per_frame = avio_rl64(pb); // average time per frame
866 if (st) {
867 st->start_time = start_time;
868 st->duration = end_time - start_time;
869 st->codecpar->bit_rate = bitrate;
870 st->avg_frame_rate.num = 10000000;
871 st->avg_frame_rate.den = time_per_frame;
872 }
873 nb_st_name = avio_rl16(pb);
874 nb_pay_exts = avio_rl16(pb);
875 for (i = 0; i < nb_st_name; i++) {
876 uint16_t len;
877
878 avio_rl16(pb); // Language ID Index
879 len = avio_rl16(pb);
880 avio_skip(pb, len);
881 }
882
883 for (i = 0; i < nb_pay_exts; i++) {
884 uint32_t len;
885 avio_skip(pb, 16); // Extension System ID
886 avio_skip(pb, 2); // Extension Data Size
887 len = avio_rl32(pb);
888 avio_skip(pb, len);
889 }
890
891 if ((ret = ff_get_guid(pb, &guid)) < 0) {
892 align_position(pb, asf->offset, size);
893
894 return 0;
895 }
896
897 g = find_guid(guid);
898 if (g && !(strcmp(g->name, "Stream Properties"))) {
899 if ((ret = g->read_object(s, g)) < 0)
900 return ret;
901 }
902
903 align_position(pb, asf->offset, size);
904 return 0;
905}
906
907static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
908{
909 ASFContext *asf = s->priv_data;
910 AVIOContext *pb = s->pb;
911 int i, ret;
912 uint64_t size = avio_rl64(pb);
913 uint16_t nb_langs = avio_rl16(pb);
914
915 if (nb_langs < ASF_MAX_STREAMS) {
916 for (i = 0; i < nb_langs; i++) {
917 size_t len;
918 len = avio_r8(pb);
919 if (!len)
920 len = 6;
921 if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
922 sizeof(asf->asf_sd[i].langs))) < 0) {
923 return ret;
924 }
925 }
926 }
927
928 align_position(pb, asf->offset, size);
929 return 0;
930}
931
932// returns data object offset when reading this object for the first time
933static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
934{
935 ASFContext *asf = s->priv_data;
936 AVIOContext *pb = s->pb;
937 uint64_t size = asf->data_size = avio_rl64(pb);
938 int i;
939
940 if (!asf->data_reached) {
941 asf->data_reached = 1;
942 asf->data_offset = asf->offset;
943 }
944
945 for (i = 0; i < asf->nb_streams; i++) {
946 if (!(asf->b_flags & ASF_FLAG_BROADCAST))
947 s->streams[i]->duration = asf->duration;
948 }
949 asf->nb_mult_left = 0;
950 asf->sub_left = 0;
951 asf->state = PARSE_PACKET_HEADER;
952 asf->return_subpayload = 0;
953 asf->packet_size_internal = 0;
954 avio_skip(pb, 16); // skip File ID
955 size = avio_rl64(pb); // Total Data Packets
956 if (size != asf->nb_packets)
957 av_log(s, AV_LOG_WARNING,
958 "Number of Packets from File Properties Object is not equal to Total"
959 "Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
960 size, asf->nb_packets);
961 avio_skip(pb, 2); // skip reserved field
962 asf->first_packet_offset = avio_tell(pb);
963 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(asf->b_flags & ASF_FLAG_BROADCAST))
964 align_position(pb, asf->offset, asf->data_size);
965
966 return 0;
967}
968
969static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
970{
971 ASFContext *asf = s->priv_data;
972 AVIOContext *pb = s->pb;
973 AVStream *st = NULL;
974 uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
975 uint32_t pkt_num, nb_entries;
976 int32_t prev_pkt_num = -1;
977 int i, ret;
978 uint64_t size = avio_rl64(pb);
979
980 // simple index objects should be ordered by stream number, this loop tries to find
981 // the first not indexed video stream
982 for (i = 0; i < asf->nb_streams; i++) {
983 if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
984 asf->asf_st[i]->indexed = 1;
985 st = s->streams[asf->asf_st[i]->index];
986 break;
987 }
988 }
989 if (!st) {
990 avio_skip(pb, size - 24); // if there's no video stream, skip index object
991 return 0;
992 }
993 avio_skip(pb, 16); // skip File ID
994 interval = avio_rl64(pb);
995 avio_skip(pb, 4);
996 nb_entries = avio_rl32(pb);
997 for (i = 0; i < nb_entries; i++) {
998 pkt_num = avio_rl32(pb);
999 ret = avio_skip(pb, 2);
1000 if (ret < 0) {
1001 av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
1002 return ret;
1003 }
1004 if (prev_pkt_num != pkt_num) {
1005 av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
1006 pkt_num, av_rescale(interval, i, 10000),
1007 asf->packet_size, 0, AVINDEX_KEYFRAME);
1008 prev_pkt_num = pkt_num;
1009 }
1010 }
1011 asf->is_simple_index = 1;
1012 align_position(pb, asf->offset, size);
1013
1014 return 0;
1015}
1016
1017static const GUIDParseTable gdef[] = {
1018 { "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
1019 { "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
1020 { "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
1021 { "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
1022 { "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
1023 { "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
1024 { "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
1025 { "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
1026 { "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
1027 { "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
1028 { "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
1029 { "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
1030 { "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
1031 { "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1032 { "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
1033 { "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1034 { "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
1035 { "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
1036 { "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1037 { "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
1038 { "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1039 { "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1040 { "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
1041 { "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1042 { "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 },
1043 { "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
1044 { "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
1045 { "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
1046 { "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1047 { "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
1048 { "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
1049 { "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
1050 { "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1051 { "Content Encryption System Windows Media DRM Network Devices",
1052 { 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
1053 { "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1054 { "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1055 { "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1056 { "Bandwidth Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1057 { "Bandwidth Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1058 { "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
1059 { "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 },
1060 { "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 },
1061 { "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 },
1062 { "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 },
1063 { "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 },
1064 { "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 },
1065};
1066
1067#define READ_LEN(flag, name, len) \
1068 do { \
1069 if ((flag) == name ## IS_BYTE) \
1070 len = avio_r8(pb); \
1071 else if ((flag) == name ## IS_WORD) \
1072 len = avio_rl16(pb); \
1073 else if ((flag) == name ## IS_DWORD) \
1074 len = avio_rl32(pb); \
1075 else \
1076 len = 0; \
1077 } while(0)
1078
1079static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
1080{
1081 ASFContext *asf = s->priv_data;
1082 AVIOContext *pb = s->pb;
1083 uint8_t sub_len;
1084 int ret, i;
1085
1086 if (is_header) {
1087 asf->dts_delta = avio_r8(pb);
1088 if (asf->nb_mult_left) {
1089 asf->mult_sub_len = avio_rl16(pb); // total
1090 }
1091 asf->sub_header_offset = avio_tell(pb);
1092 asf->nb_sub = 0;
1093 asf->sub_left = 1;
1094 }
1095 sub_len = avio_r8(pb);
1096 if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
1097 return ret;
1098 for (i = 0; i < asf->nb_streams; i++) {
1099 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1100 pkt->stream_index = asf->asf_st[i]->index;
1101 break;
1102 }
1103 }
1104 asf->return_subpayload = 1;
1105 if (!sub_len)
1106 asf->return_subpayload = 0;
1107
1108 if (sub_len)
1109 asf->nb_sub++;
1110 pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
1111 if (asf->nb_mult_left && (avio_tell(pb) >=
1112 (asf->sub_header_offset + asf->mult_sub_len))) {
1113 asf->sub_left = 0;
1114 asf->nb_mult_left--;
1115 }
1116 if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
1117 asf->sub_left = 0;
1118 if (!asf->nb_mult_left) {
1119 avio_skip(pb, asf->pad_len);
1120 if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
1121 if (!asf->packet_size)
1122 return AVERROR_INVALIDDATA;
1123 av_log(s, AV_LOG_WARNING,
1124 "Position %"PRId64" wrong, should be %"PRId64"\n",
1125 avio_tell(pb), asf->packet_offset + asf->packet_size);
1126 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1127 }
1128 }
1129 }
1130
1131 return 0;
1132}
1133
1134static void reset_packet(ASFPacket *asf_pkt)
1135{
1136 asf_pkt->size_left = 0;
1137 asf_pkt->data_size = 0;
1138 asf_pkt->duration = 0;
1139 asf_pkt->flags = 0;
1140 asf_pkt->dts = 0;
1141 asf_pkt->duration = 0;
1142 av_packet_unref(&asf_pkt->avpkt);
1143 av_init_packet(&asf_pkt->avpkt);
1144}
1145
1146static int asf_read_replicated_data(AVFormatContext *s, ASFPacket *asf_pkt)
1147{
1148 ASFContext *asf = s->priv_data;
1149 AVIOContext *pb = s->pb;
1150 int ret, data_size;
1151
1152 if (!asf_pkt->data_size) {
1153 data_size = avio_rl32(pb); // read media object size
1154 if (data_size <= 0)
1155 return AVERROR_INVALIDDATA;
1156 if ((ret = av_new_packet(&asf_pkt->avpkt, data_size)) < 0)
1157 return ret;
1158 asf_pkt->data_size = asf_pkt->size_left = data_size;
1159 } else
1160 avio_skip(pb, 4); // reading of media object size is already done
1161 asf_pkt->dts = avio_rl32(pb); // read presentation time
1162 if (asf->rep_data_len && (asf->rep_data_len >= 8))
1163 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1164
1165 return 0;
1166}
1167
1168static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
1169 ASFPacket *asf_pkt)
1170{
1171 ASFContext *asf = s->priv_data;
1172 AVIOContext *pb = s->pb;
1173 uint16_t pay_len;
1174 unsigned char *p;
1175 int ret;
1176 int skip = 0;
1177
1178 // if replicated length is 1, subpayloads are present
1179 if (asf->rep_data_len == 1) {
1180 asf->sub_left = 1;
1181 asf->state = READ_MULTI_SUB;
1182 pkt->flags = asf_pkt->flags;
1183 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1184 return ret;
1185 } else {
1186 if (asf->rep_data_len)
1187 if ((ret = asf_read_replicated_data(s, asf_pkt)) < 0)
1188 return ret;
1189 pay_len = avio_rl16(pb); // payload length should be WORD
1190 if (pay_len > asf->packet_size) {
1191 av_log(s, AV_LOG_ERROR,
1192 "Error: invalid data packet size, pay_len %"PRIu16", "
1193 "asf->packet_size %"PRIu32", offset %"PRId64".\n",
1194 pay_len, asf->packet_size, avio_tell(pb));
1195 return AVERROR_INVALIDDATA;
1196 }
1197 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1198 if (pay_len > asf_pkt->size_left) {
1199 av_log(s, AV_LOG_ERROR,
1200 "Error: invalid buffer size, pay_len %d, data size left %d.\n",
1201 pay_len, asf_pkt->size_left);
1202 skip = pay_len - asf_pkt->size_left;
1203 pay_len = asf_pkt->size_left;
1204 }
1205 if (asf_pkt->size_left <= 0)
1206 return AVERROR_INVALIDDATA;
1207 if ((ret = avio_read(pb, p, pay_len)) < 0)
1208 return ret;
1209 if (s->key && s->keylen == 20)
1210 ff_asfcrypt_dec(s->key, p, ret);
1211 avio_skip(pb, skip);
1212 asf_pkt->size_left -= pay_len;
1213 asf->nb_mult_left--;
1214 }
1215
1216 return 0;
1217}
1218
1219static int asf_read_single_payload(AVFormatContext *s, ASFPacket *asf_pkt)
1220{
1221 ASFContext *asf = s->priv_data;
1222 AVIOContext *pb = s->pb;
1223 int64_t offset;
1224 uint64_t size;
1225 unsigned char *p;
1226 int ret, data_size;
1227
1228 if (!asf_pkt->data_size) {
1229 data_size = avio_rl32(pb); // read media object size
1230 if (data_size <= 0)
1231 return AVERROR_EOF;
1232 if ((ret = av_new_packet(&asf_pkt->avpkt, data_size)) < 0)
1233 return ret;
1234 asf_pkt->data_size = asf_pkt->size_left = data_size;
1235 } else
1236 avio_skip(pb, 4); // skip media object size
1237 asf_pkt->dts = avio_rl32(pb); // read presentation time
1238 if (asf->rep_data_len >= 8)
1239 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1240 offset = avio_tell(pb);
1241
1242 // size of the payload - size of the packet without header and padding
1243 if (asf->packet_size_internal)
1244 size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
1245 else
1246 size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
1247 if (size > asf->packet_size) {
1248 av_log(s, AV_LOG_ERROR,
1249 "Error: invalid data packet size, offset %"PRId64".\n",
1250 avio_tell(pb));
1251 return AVERROR_INVALIDDATA;
1252 }
1253 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1254 if (size > asf_pkt->size_left || asf_pkt->size_left <= 0)
1255 return AVERROR_INVALIDDATA;
1256 if (asf_pkt->size_left > size)
1257 asf_pkt->size_left -= size;
1258 else
1259 asf_pkt->size_left = 0;
1260 if ((ret = avio_read(pb, p, size)) < 0)
1261 return ret;
1262 if (s->key && s->keylen == 20)
1263 ff_asfcrypt_dec(s->key, p, ret);
1264 if (asf->packet_size_internal)
1265 avio_skip(pb, asf->packet_size - asf->packet_size_internal);
1266 avio_skip(pb, asf->pad_len); // skip padding
1267
1268 return 0;
1269}
1270
1271static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
1272{
1273 ASFContext *asf = s->priv_data;
1274 AVIOContext *pb = s->pb;
1275 int ret, i;
1276 ASFPacket *asf_pkt = NULL;
1277
1278 if (!asf->sub_left) {
1279 uint32_t off_len, media_len;
1280 uint8_t stream_num;
1281
1282 stream_num = avio_r8(pb);
1283 asf->stream_index = stream_num & ASF_STREAM_NUM;
1284 for (i = 0; i < asf->nb_streams; i++) {
1285 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1286 asf_pkt = &asf->asf_st[i]->pkt;
1287 asf_pkt->stream_index = asf->asf_st[i]->index;
1288 break;
1289 }
1290 }
1291 if (!asf_pkt) {
1292 if (asf->packet_offset + asf->packet_size <= asf->data_offset + asf->data_size) {
1293 if (!asf->packet_size) {
1294 av_log(s, AV_LOG_ERROR, "Invalid packet size 0.\n");
1295 return AVERROR_INVALIDDATA;
1296 }
1297 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1298 av_log(s, AV_LOG_WARNING, "Skipping the stream with the invalid stream index %d.\n",
1299 asf->stream_index);
1300 return AVERROR(EAGAIN);
1301 } else
1302 return AVERROR_INVALIDDATA;
1303 }
1304
1305 if (stream_num >> 7)
1306 asf_pkt->flags |= AV_PKT_FLAG_KEY;
1307 READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
1308 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
1309 READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
1310 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
1311 READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
1312 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
1313 if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
1314 av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
1315 reset_packet(asf_pkt);
1316 }
1317 asf_pkt->frame_num = media_len;
1318 asf->sub_dts = off_len;
1319 if (asf->nb_mult_left) {
1320 if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
1321 return ret;
1322 } else if (asf->rep_data_len == 1) {
1323 asf->sub_left = 1;
1324 asf->state = READ_SINGLE;
1325 pkt->flags = asf_pkt->flags;
1326 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1327 return ret;
1328 } else {
1329 if ((ret = asf_read_single_payload(s, asf_pkt)) < 0)
1330 return ret;
1331 }
1332 } else {
1333 for (i = 0; i <= asf->nb_streams; i++) {
1334 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1335 asf_pkt = &asf->asf_st[i]->pkt;
1336 break;
1337 }
1338 }
1339 if (!asf_pkt)
1340 return AVERROR_INVALIDDATA;
1341 pkt->flags = asf_pkt->flags;
1342 pkt->dts = asf_pkt->dts;
1343 pkt->stream_index = asf->asf_st[i]->index;
1344 if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
1345 return ret;
1346 }
1347
1348 return 0;
1349}
1350
1351static int asf_read_packet_header(AVFormatContext *s)
1352{
1353 ASFContext *asf = s->priv_data;
1354 AVIOContext *pb = s->pb;
1355 uint64_t size;
1356 uint32_t av_unused seq;
1357 unsigned char error_flags, len_flags, pay_flags;
1358
1359 asf->packet_offset = avio_tell(pb);
1360 error_flags = avio_r8(pb); // read Error Correction Flags
1361 if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT) {
1362 if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
1363 size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
1364 avio_skip(pb, size);
1365 }
1366 len_flags = avio_r8(pb);
1367 } else
1368 len_flags = error_flags;
1369 asf->prop_flags = avio_r8(pb);
1370 READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
1371 ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
1372 READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
1373 ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
1374 READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
1375 ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
1376 asf->send_time = avio_rl32(pb); // send time
1377 avio_skip(pb, 2); // skip duration
1378 if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
1379 pay_flags = avio_r8(pb);
1380 asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
1381 }
1382
1383 return 0;
1384}
1385
1386static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
1387{
1388 ASFContext *asf = s->priv_data;
1389 ASFStream *asf_st = asf->asf_st[st_num];
1390 unsigned char *p = asf_pkt->avpkt.data;
1391 uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
1392 uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
1393 int nchunks = pkt_len / chunk_len;
1394 AVPacket pkt;
1395 int pos = 0, j, l, ret;
1396
1397
1398 if ((ret = av_new_packet(&pkt, asf_pkt->data_size)) < 0)
1399 return ret;
1400
1401 while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
1402 if (pos >= asf_pkt->data_size) {
1403 break;
1404 }
1405 for (l = 0; l < pkt_len; l++) {
1406 if (pos >= asf_pkt->data_size) {
1407 break;
1408 }
1409 for (j = 0; j < asf_st->span; j++) {
1410 if ((pos + chunk_len) >= asf_pkt->data_size)
1411 break;
1412 memcpy(pkt.data + pos,
1413 p + (j * nchunks + l) * chunk_len,
1414 chunk_len);
1415 pos += chunk_len;
1416 }
1417 }
1418 p += asf_st->span * pkt_len;
1419 if (p > asf_pkt->avpkt.data + asf_pkt->data_size)
1420 break;
1421 }
1422 av_packet_unref(&asf_pkt->avpkt);
1423 asf_pkt->avpkt = pkt;
1424
1425 return 0;
1426}
1427
1428static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1429{
1430 ASFContext *asf = s->priv_data;
1431 AVIOContext *pb = s->pb;
1432 int ret, i;
1433
1434 if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
1435 !(asf->b_flags & ASF_FLAG_BROADCAST))
1436 return AVERROR_EOF;
1437 while (!pb->eof_reached) {
1438 if (asf->state == PARSE_PACKET_HEADER) {
1439 asf_read_packet_header(s);
1440 if (pb->eof_reached)
1441 break;
1442 if (!asf->nb_mult_left)
1443 asf->state = READ_SINGLE;
1444 else
1445 asf->state = READ_MULTI;
1446 }
1447 ret = asf_read_payload(s, pkt);
1448 if (ret == AVERROR(EAGAIN)) {
1449 asf->state = PARSE_PACKET_HEADER;
1450 continue;
1451 }
1452 else if (ret < 0)
1453 return ret;
1454
1455 switch (asf->state) {
1456 case READ_SINGLE:
1457 if (!asf->sub_left)
1458 asf->state = PARSE_PACKET_HEADER;
1459 break;
1460 case READ_MULTI_SUB:
1461 if (!asf->sub_left && !asf->nb_mult_left) {
1462 asf->state = PARSE_PACKET_HEADER;
1463 if (!asf->return_subpayload &&
1464 (avio_tell(pb) <= asf->packet_offset +
1465 asf->packet_size - asf->pad_len))
1466 avio_skip(pb, asf->pad_len); // skip padding
1467 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1468 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1469 } else if (!asf->sub_left)
1470 asf->state = READ_MULTI;
1471 break;
1472 case READ_MULTI:
1473 if (!asf->nb_mult_left) {
1474 asf->state = PARSE_PACKET_HEADER;
1475 if (!asf->return_subpayload &&
1476 (avio_tell(pb) <= asf->packet_offset +
1477 asf->packet_size - asf->pad_len))
1478 avio_skip(pb, asf->pad_len); // skip padding
1479 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1480 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1481 }
1482 break;
1483 }
1484 if (asf->return_subpayload) {
1485 asf->return_subpayload = 0;
1486 return 0;
1487 }
1488 for (i = 0; i < s->nb_streams; i++) {
1489 ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
1490 if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
1491 if (asf->asf_st[i]->span > 1 &&
1492 asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
1493 if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
1494 return ret;
1495 av_packet_move_ref(pkt, &asf_pkt->avpkt);
1496 pkt->stream_index = asf->asf_st[i]->index;
1497 pkt->flags = asf_pkt->flags;
1498 pkt->dts = asf_pkt->dts - asf->preroll;
1499 asf_pkt->data_size = 0;
1500 asf_pkt->frame_num = 0;
1501 return 0;
1502 }
1503 }
1504 }
1505
1506 if (pb->eof_reached)
1507 return AVERROR_EOF;
1508
1509 return 0;
1510}
1511
1512static int asf_read_close(AVFormatContext *s)
1513{
1514 ASFContext *asf = s->priv_data;
1515 int i;
1516
1517 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1518 av_dict_free(&asf->asf_sd[i].asf_met);
1519 if (i < asf->nb_streams) {
1520 av_packet_unref(&asf->asf_st[i]->pkt.avpkt);
1521 av_freep(&asf->asf_st[i]);
1522 }
1523 }
1524
1525 asf->nb_streams = 0;
1526 return 0;
1527}
1528
1529static void reset_packet_state(AVFormatContext *s)
1530{
1531 ASFContext *asf = s->priv_data;
1532 int i;
1533
1534 asf->state = PARSE_PACKET_HEADER;
1535 asf->offset = 0;
1536 asf->return_subpayload = 0;
1537 asf->sub_left = 0;
1538 asf->sub_header_offset = 0;
1539 asf->packet_offset = asf->first_packet_offset;
1540 asf->pad_len = 0;
1541 asf->rep_data_len = 0;
1542 asf->dts_delta = 0;
1543 asf->mult_sub_len = 0;
1544 asf->nb_mult_left = 0;
1545 asf->nb_sub = 0;
1546 asf->prop_flags = 0;
1547 asf->sub_dts = 0;
1548 for (i = 0; i < asf->nb_streams; i++) {
1549 ASFPacket *pkt = &asf->asf_st[i]->pkt;
1550 pkt->size_left = 0;
1551 pkt->data_size = 0;
1552 pkt->duration = 0;
1553 pkt->flags = 0;
1554 pkt->dts = 0;
1555 pkt->duration = 0;
1556 av_packet_unref(&pkt->avpkt);
1557 av_init_packet(&pkt->avpkt);
1558 }
1559}
1560
1561/*
1562 * Find a timestamp for the requested position within the payload
1563 * where the pos (position) is the offset inside the Data Object.
1564 * When position is not on the packet boundary, asf_read_timestamp tries
1565 * to find the closest packet offset after this position. If this packet
1566 * is a key frame, this packet timestamp is read and an index entry is created
1567 * for the packet. If this packet belongs to the requested stream,
1568 * asf_read_timestamp upgrades pos to the packet beginning offset and
1569 * returns this packet's dts. So returned dts is the dts of the first key frame with
1570 * matching stream number after given position.
1571 */
1572static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
1573 int64_t *pos, int64_t pos_limit)
1574{
1575 ASFContext *asf = s->priv_data;
1576 int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
1577 AVPacket pkt;
1578 int n;
1579
1580 data_end = asf->data_offset + asf->data_size;
1581
1582 n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
1583 asf->packet_size;
1584 n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
1585 pkt_pos = asf->first_packet_offset + n * asf->packet_size;
1586
1587 avio_seek(s->pb, pkt_pos, SEEK_SET);
1588 pkt_offset = pkt_pos;
1589
1590 reset_packet_state(s);
1591 while (avio_tell(s->pb) < data_end) {
1592
1593 int i, ret, st_found;
1594
1595 av_init_packet(&pkt);
1596 pkt_offset = avio_tell(s->pb);
1597 if ((ret = asf_read_packet(s, &pkt)) < 0) {
1598 dts = AV_NOPTS_VALUE;
1599 return ret;
1600 }
1601 // ASFPacket may contain fragments of packets belonging to different streams,
1602 // pkt_offset is the offset of the first fragment within it.
1603 if ((pkt_offset >= (pkt_pos + asf->packet_size)))
1604 pkt_pos += asf->packet_size;
1605 for (i = 0; i < asf->nb_streams; i++) {
1606 ASFStream *st = asf->asf_st[i];
1607
1608 st_found = 0;
1609 if (pkt.flags & AV_PKT_FLAG_KEY) {
1610 dts = pkt.dts;
1611 if (dts) {
1612 av_add_index_entry(s->streams[pkt.stream_index], pkt_pos,
1613 dts, pkt.size, 0, AVINDEX_KEYFRAME);
1614 if (stream_index == st->index) {
1615 st_found = 1;
1616 break;
1617 }
1618 }
1619 }
1620 }
1621 if (st_found)
1622 break;
1623 av_packet_unref(&pkt);
1624 }
1625 *pos = pkt_pos;
1626
1627 av_packet_unref(&pkt);
1628 return dts;
1629}
1630
1631static int asf_read_seek(AVFormatContext *s, int stream_index,
1632 int64_t timestamp, int flags)
1633{
1634 ASFContext *asf = s->priv_data;
1635 int idx, ret;
1636
1637 if (s->streams[stream_index]->nb_index_entries && asf->is_simple_index) {
1638 idx = av_index_search_timestamp(s->streams[stream_index], timestamp, flags);
1639 if (idx < 0 || idx >= s->streams[stream_index]->nb_index_entries)
1640 return AVERROR_INVALIDDATA;
1641 avio_seek(s->pb, s->streams[stream_index]->index_entries[idx].pos, SEEK_SET);
1642 } else {
1643 if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
1644 return ret;
1645 }
1646
1647 reset_packet_state(s);
1648
1649 return 0;
1650}
1651
1652static const GUIDParseTable *find_guid(ff_asf_guid guid)
1653{
1654 int j, ret;
1655 const GUIDParseTable *g;
1656
1657 swap_guid(guid);
1658 g = gdef;
1659 for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
1660 if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
1661 return g;
1662 g++;
1663 }
1664
1665 return NULL;
1666}
1667
1668static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
1669{
1670 ASFContext *asf = s->priv_data;
1671 AVIOContext *pb = s->pb;
1672 const GUIDParseTable *g = NULL;
1673 ff_asf_guid guid;
1674 int ret;
1675
1676 while (avio_tell(pb) <= offset + size) {
1677 if (avio_tell(pb) == asf->offset)
1678 break;
1679 asf->offset = avio_tell(pb);
1680 if ((ret = ff_get_guid(pb, &guid)) < 0)
1681 return ret;
1682 g = find_guid(guid);
1683 if (g) {
1684 if ((ret = g->read_object(s, g)) < 0)
1685 return ret;
1686 } else {
1687 GUIDParseTable g2;
1688
1689 g2.name = "Unknown";
1690 g2.is_subobject = 1;
1691 asf_read_unknown(s, &g2);
1692 }
1693 }
1694
1695 return 0;
1696}
1697
1698static int asf_read_header(AVFormatContext *s)
1699{
1700 ASFContext *asf = s->priv_data;
1701 AVIOContext *pb = s->pb;
1702 const GUIDParseTable *g = NULL;
1703 ff_asf_guid guid;
1704 int i, ret;
1705 uint64_t size;
1706
1707 asf->preroll = 0;
1708 asf->is_simple_index = 0;
1709 ff_get_guid(pb, &guid);
1710 if (ff_guidcmp(&guid, &ff_asf_header))
1711 return AVERROR_INVALIDDATA;
1712 avio_skip(pb, 8); // skip header object size
1713 avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
1714 asf->data_reached = 0;
1715
1716 /* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
1717 * for the first time,
1718 * Index object is processed and got eof and then seeking back to the Data is performed.
1719 */
1720 while (1) {
1721 // for the cases when object size is invalid
1722 if (avio_tell(pb) == asf->offset)
1723 break;
1724 asf->offset = avio_tell(pb);
1725 if ((ret = ff_get_guid(pb, &guid)) < 0) {
1726 if (ret == AVERROR_EOF && asf->data_reached)
1727 break;
1728 else
1729 goto failed;
1730 }
1731 g = find_guid(guid);
1732 if (g) {
1733 asf->unknown_offset = asf->offset;
1734 asf->is_header = 1;
1735 if ((ret = g->read_object(s, g)) < 0)
1736 goto failed;
1737 } else {
1738 size = avio_rl64(pb);
1739 align_position(pb, asf->offset, size);
1740 }
1741 if (asf->data_reached &&
1742 (!(pb->seekable & AVIO_SEEKABLE_NORMAL) ||
1743 (asf->b_flags & ASF_FLAG_BROADCAST)))
1744 break;
1745 }
1746
1747 if (!asf->data_reached) {
1748 av_log(s, AV_LOG_ERROR, "Data Object was not found.\n");
1749 ret = AVERROR_INVALIDDATA;
1750 goto failed;
1751 }
1752 if (pb->seekable & AVIO_SEEKABLE_NORMAL)
1753 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1754
1755 for (i = 0; i < asf->nb_streams; i++) {
1756 const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
1757 AVStream *st = s->streams[asf->asf_st[i]->index];
1758 set_language(s, rfc1766, &st->metadata);
1759 }
1760
1761 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1762 AVStream *st = NULL;
1763
1764 st = find_stream(s, i);
1765 if (st) {
1766 av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
1767 if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
1768 st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
1769 st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
1770 }
1771 }
1772 }
1773
1774 return 0;
1775
1776failed:
1777 asf_read_close(s);
1778 return ret;
1779}
1780
1781AVInputFormat ff_asf_o_demuxer = {
1782 .name = "asf_o",
1783 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1784 .priv_data_size = sizeof(ASFContext),
1785 .read_probe = asf_probe,
1786 .read_header = asf_read_header,
1787 .read_packet = asf_read_packet,
1788 .read_close = asf_read_close,
1789 .read_timestamp = asf_read_timestamp,
1790 .read_seek = asf_read_seek,
1791 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1792};
1793
generated by cgit at 2024-05-17 03:42:22 (GMT)