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
58 typedef 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
65 typedef 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
76 typedef 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
88 typedef struct ASFStreamData{
89 char langs[32];
90 AVDictionary *asf_met; // for storing per-stream metadata
91 AVRational aspect_ratio;
92 } ASFStreamData;
93
94 typedef 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
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
asf_probe(const AVProbeData * pd)150 static int asf_probe(const 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
swap_guid(ff_asf_guid guid)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
align_position(AVIOContext * pb,int64_t offset,uint64_t size)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
asf_read_unknown(AVFormatContext * s,const GUIDParseTable * g)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)
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
get_asf_string(AVIOContext * pb,int maxlen,char * buf,int buflen)203 static 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
asf_read_marker(AVFormatContext * s,const GUIDParseTable * g)220 static 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 (avio_feof(pb))
249 return AVERROR_INVALIDDATA;
250
251 if ((ret = avio_get_str16le(pb, len, name,
252 sizeof(name))) < len)
253 avio_skip(pb, len - ret);
254 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pts,
255 AV_NOPTS_VALUE, name);
256 }
257 align_position(pb, asf->offset, size);
258
259 return 0;
260 }
261
asf_read_metadata(AVFormatContext * s,const char * title,uint16_t len,unsigned char * ch,uint16_t buflen)262 static int asf_read_metadata(AVFormatContext *s, const char *title, uint16_t len,
263 unsigned char *ch, uint16_t buflen)
264 {
265 AVIOContext *pb = s->pb;
266
267 avio_get_str16le(pb, len, ch, buflen);
268 if (ch[0]) {
269 if (av_dict_set(&s->metadata, title, ch, 0) < 0)
270 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
271 }
272
273 return 0;
274 }
275
asf_read_value(AVFormatContext * s,const uint8_t * name,uint16_t val_len,int type,AVDictionary ** met)276 static int asf_read_value(AVFormatContext *s, const uint8_t *name,
277 uint16_t val_len, int type, AVDictionary **met)
278 {
279 int ret;
280 uint8_t *value;
281 uint16_t buflen = 2 * val_len + 1;
282 AVIOContext *pb = s->pb;
283
284 value = av_malloc(buflen);
285 if (!value)
286 return AVERROR(ENOMEM);
287 if (type == ASF_UNICODE) {
288 // get_asf_string reads UTF-16 and converts it to UTF-8 which needs longer buffer
289 if ((ret = get_asf_string(pb, val_len, value, buflen)) < 0)
290 goto failed;
291 if (av_dict_set(met, name, value, 0) < 0)
292 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
293 } else {
294 char buf[256];
295 if (val_len > sizeof(buf)) {
296 ret = AVERROR_INVALIDDATA;
297 goto failed;
298 }
299 if ((ret = avio_read(pb, value, val_len)) < 0)
300 goto failed;
301 if (ret < 2 * val_len)
302 value[ret] = '\0';
303 else
304 value[2 * val_len - 1] = '\0';
305 snprintf(buf, sizeof(buf), "%s", value);
306 if (av_dict_set(met, name, buf, 0) < 0)
307 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
308 }
309 av_freep(&value);
310
311 return 0;
312
313 failed:
314 av_freep(&value);
315 return ret;
316 }
asf_read_generic_value(AVIOContext * pb,int type,uint64_t * value)317 static int asf_read_generic_value(AVIOContext *pb, int type, uint64_t *value)
318 {
319
320 switch (type) {
321 case ASF_BOOL:
322 *value = avio_rl16(pb);
323 break;
324 case ASF_DWORD:
325 *value = avio_rl32(pb);
326 break;
327 case ASF_QWORD:
328 *value = avio_rl64(pb);
329 break;
330 case ASF_WORD:
331 *value = avio_rl16(pb);
332 break;
333 default:
334 return AVERROR_INVALIDDATA;
335 }
336
337 return 0;
338 }
339
asf_set_metadata(AVFormatContext * s,const uint8_t * name,int type,AVDictionary ** met)340 static int asf_set_metadata(AVFormatContext *s, const uint8_t *name,
341 int type, AVDictionary **met)
342 {
343 AVIOContext *pb = s->pb;
344 uint64_t value;
345 char buf[32];
346 int ret;
347
348 ret = asf_read_generic_value(pb, type, &value);
349 if (ret < 0)
350 return ret;
351
352 snprintf(buf, sizeof(buf), "%"PRIu64, value);
353 if (av_dict_set(met, name, buf, 0) < 0)
354 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
355
356 return 0;
357 }
358
359 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
360 * but in reality this is only loosely similar */
asf_read_picture(AVFormatContext * s,int len)361 static int asf_read_picture(AVFormatContext *s, int len)
362 {
363 ASFContext *asf = s->priv_data;
364 AVPacket pkt = { 0 };
365 const CodecMime *mime = ff_id3v2_mime_tags;
366 enum AVCodecID id = AV_CODEC_ID_NONE;
367 char mimetype[64];
368 uint8_t *desc = NULL;
369 AVStream *st = NULL;
370 int ret, type, picsize, desc_len;
371 ASFStream *asf_st;
372
373 /* type + picsize + mime + desc */
374 if (len < 1 + 4 + 2 + 2) {
375 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
376 return AVERROR_INVALIDDATA;
377 }
378
379 /* picture type */
380 type = avio_r8(s->pb);
381 len--;
382 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
383 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
384 type = 0;
385 }
386
387 /* picture data size */
388 picsize = avio_rl32(s->pb);
389 len -= 4;
390
391 /* picture MIME type */
392 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
393 while (mime->id != AV_CODEC_ID_NONE) {
394 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
395 id = mime->id;
396 break;
397 }
398 mime++;
399 }
400 if (id == AV_CODEC_ID_NONE) {
401 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
402 mimetype);
403 return 0;
404 }
405
406 if (picsize >= len) {
407 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
408 picsize, len);
409 return AVERROR_INVALIDDATA;
410 }
411
412 /* picture description */
413 desc_len = (len - picsize) * 2 + 1;
414 desc = av_malloc(desc_len);
415 if (!desc)
416 return AVERROR(ENOMEM);
417 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
418
419 ret = av_get_packet(s->pb, &pkt, picsize);
420 if (ret < 0)
421 goto fail;
422
423 st = avformat_new_stream(s, NULL);
424 if (!st) {
425 ret = AVERROR(ENOMEM);
426 goto fail;
427 }
428 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
429 asf_st = asf->asf_st[asf->nb_streams];
430 if (!asf_st) {
431 ret = AVERROR(ENOMEM);
432 goto fail;
433 }
434
435 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
436 st->codecpar->codec_type = asf_st->type = AVMEDIA_TYPE_VIDEO;
437 st->codecpar->codec_id = id;
438 st->attached_pic = pkt;
439 st->attached_pic.stream_index = asf_st->index = st->index;
440 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
441
442 asf->nb_streams++;
443
444 if (*desc) {
445 if (av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL) < 0)
446 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
447 } else
448 av_freep(&desc);
449
450 if (av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0) < 0)
451 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
452
453 return 0;
454
455 fail:
456 av_freep(&desc);
457 av_packet_unref(&pkt);
458 return ret;
459 }
460
get_id3_tag(AVFormatContext * s,int len)461 static void get_id3_tag(AVFormatContext *s, int len)
462 {
463 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
464
465 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
466 if (id3v2_extra_meta) {
467 ff_id3v2_parse_apic(s, id3v2_extra_meta);
468 ff_id3v2_parse_chapters(s, id3v2_extra_meta);
469 }
470 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
471 }
472
process_metadata(AVFormatContext * s,const uint8_t * name,uint16_t name_len,uint16_t val_len,uint16_t type,AVDictionary ** met)473 static int process_metadata(AVFormatContext *s, const uint8_t *name, uint16_t name_len,
474 uint16_t val_len, uint16_t type, AVDictionary **met)
475 {
476 int ret;
477 ff_asf_guid guid;
478
479 if (val_len) {
480 switch (type) {
481 case ASF_UNICODE:
482 asf_read_value(s, name, val_len, type, met);
483 break;
484 case ASF_BYTE_ARRAY:
485 if (!strcmp(name, "WM/Picture")) // handle cover art
486 asf_read_picture(s, val_len);
487 else if (!strcmp(name, "ID3")) // handle ID3 tag
488 get_id3_tag(s, val_len);
489 else
490 asf_read_value(s, name, val_len, type, met);
491 break;
492 case ASF_GUID:
493 ff_get_guid(s->pb, &guid);
494 break;
495 default:
496 if ((ret = asf_set_metadata(s, name, type, met)) < 0)
497 return ret;
498 break;
499 }
500 }
501
502 return 0;
503 }
504
asf_read_ext_content(AVFormatContext * s,const GUIDParseTable * g)505 static int asf_read_ext_content(AVFormatContext *s, const GUIDParseTable *g)
506 {
507 ASFContext *asf = s->priv_data;
508 AVIOContext *pb = s->pb;
509 uint64_t size = avio_rl64(pb);
510 uint16_t nb_desc = avio_rl16(pb);
511 int i, ret;
512
513 for (i = 0; i < nb_desc; i++) {
514 uint16_t name_len, type, val_len;
515 uint8_t *name = NULL;
516
517 name_len = avio_rl16(pb);
518 if (!name_len)
519 return AVERROR_INVALIDDATA;
520 name = av_malloc(name_len);
521 if (!name)
522 return AVERROR(ENOMEM);
523 avio_get_str16le(pb, name_len, name,
524 name_len);
525 type = avio_rl16(pb);
526 // BOOL values are 16 bits long in the Metadata Object
527 // but 32 bits long in the Extended Content Description Object
528 if (type == ASF_BOOL)
529 type = ASF_DWORD;
530 val_len = avio_rl16(pb);
531
532 ret = process_metadata(s, name, name_len, val_len, type, &s->metadata);
533 av_freep(&name);
534 if (ret < 0)
535 return ret;
536 }
537
538 align_position(pb, asf->offset, size);
539 return 0;
540 }
541
find_stream(AVFormatContext * s,uint16_t st_num)542 static AVStream *find_stream(AVFormatContext *s, uint16_t st_num)
543 {
544 AVStream *st = NULL;
545 ASFContext *asf = s->priv_data;
546 int i;
547
548 for (i = 0; i < asf->nb_streams; i++) {
549 if (asf->asf_st[i]->stream_index == st_num) {
550 st = s->streams[asf->asf_st[i]->index];
551 break;
552 }
553 }
554
555 return st;
556 }
557
asf_store_aspect_ratio(AVFormatContext * s,uint8_t st_num,uint8_t * name,int type)558 static int asf_store_aspect_ratio(AVFormatContext *s, uint8_t st_num, uint8_t *name, int type)
559 {
560 ASFContext *asf = s->priv_data;
561 AVIOContext *pb = s->pb;
562 uint64_t value = 0;
563 int ret;
564
565 ret = asf_read_generic_value(pb, type, &value);
566 if (ret < 0)
567 return ret;
568
569 if (st_num < ASF_MAX_STREAMS) {
570 if (!strcmp(name, "AspectRatioX"))
571 asf->asf_sd[st_num].aspect_ratio.num = value;
572 else
573 asf->asf_sd[st_num].aspect_ratio.den = value;
574 }
575 return 0;
576 }
577
asf_read_metadata_obj(AVFormatContext * s,const GUIDParseTable * g)578 static int asf_read_metadata_obj(AVFormatContext *s, const GUIDParseTable *g)
579 {
580 ASFContext *asf = s->priv_data;
581 AVIOContext *pb = s->pb;
582 uint64_t size = avio_rl64(pb);
583 uint16_t nb_recs = avio_rl16(pb); // number of records in the Description Records list
584 int i, ret;
585
586 for (i = 0; i < nb_recs; i++) {
587 uint16_t name_len, buflen, type, val_len, st_num;
588 uint8_t *name = NULL;
589
590 avio_skip(pb, 2); // skip reserved field
591 st_num = avio_rl16(pb);
592 name_len = avio_rl16(pb);
593 buflen = 2 * name_len + 1;
594 if (!name_len)
595 break;
596 type = avio_rl16(pb);
597 val_len = avio_rl32(pb);
598 name = av_malloc(buflen);
599 if (!name)
600 return AVERROR(ENOMEM);
601 avio_get_str16le(pb, name_len, name,
602 buflen);
603 if (!strcmp(name, "AspectRatioX") || !strcmp(name, "AspectRatioY")) {
604 ret = asf_store_aspect_ratio(s, st_num, name, type);
605 if (ret < 0) {
606 av_freep(&name);
607 break;
608 }
609 } else {
610 if (st_num < ASF_MAX_STREAMS) {
611 if ((ret = process_metadata(s, name, name_len, val_len, type,
612 &asf->asf_sd[st_num].asf_met)) < 0) {
613 av_freep(&name);
614 break;
615 }
616 }
617 }
618 av_freep(&name);
619 }
620
621 align_position(pb, asf->offset, size);
622 return 0;
623 }
624
asf_read_content_desc(AVFormatContext * s,const GUIDParseTable * g)625 static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
626 {
627 ASFContext *asf = s->priv_data;
628 AVIOContext *pb = s->pb;
629 int i;
630 static const char *const titles[] =
631 { "Title", "Author", "Copyright", "Description", "Rate" };
632 uint16_t len[5], buflen[5] = { 0 };
633 uint8_t *ch;
634 uint64_t size = avio_rl64(pb);
635
636 for (i = 0; i < 5; i++) {
637 len[i] = avio_rl16(pb);
638 // utf8 string should be <= 2 * utf16 string, extra byte for the terminator
639 buflen[i] = 2 * len[i] + 1;
640 }
641
642 for (i = 0; i < 5; i++) {
643 ch = av_malloc(buflen[i]);
644 if (!ch)
645 return(AVERROR(ENOMEM));
646 asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
647 av_freep(&ch);
648 }
649 align_position(pb, asf->offset, size);
650
651 return 0;
652 }
653
asf_read_properties(AVFormatContext * s,const GUIDParseTable * g)654 static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
655 {
656 ASFContext *asf = s->priv_data;
657 AVIOContext *pb = s->pb;
658 time_t creation_time;
659
660 avio_rl64(pb); // read object size
661 avio_skip(pb, 16); // skip File ID
662 avio_skip(pb, 8); // skip File size
663 creation_time = avio_rl64(pb);
664 if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
665 struct tm tmbuf;
666 struct tm *tm;
667 char buf[64];
668
669 // creation date is in 100 ns units from 1 Jan 1601, conversion to s
670 creation_time /= 10000000;
671 // there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
672 creation_time -= 11644473600;
673 tm = gmtime_r(&creation_time, &tmbuf);
674 if (tm) {
675 if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
676 buf[0] = '\0';
677 } else
678 buf[0] = '\0';
679 if (buf[0]) {
680 if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
681 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
682 }
683 }
684 asf->nb_packets = avio_rl64(pb);
685 asf->duration = avio_rl64(pb) / 10000; // stream duration
686 avio_skip(pb, 8); // skip send duration
687 asf->preroll = avio_rl64(pb);
688 asf->duration -= asf->preroll;
689 asf->b_flags = avio_rl32(pb);
690 avio_skip(pb, 4); // skip minimal packet size
691 asf->packet_size = avio_rl32(pb);
692 avio_skip(pb, 4); // skip max_bitrate
693
694 return 0;
695 }
696
parse_video_info(AVIOContext * pb,AVStream * st)697 static int parse_video_info(AVIOContext *pb, AVStream *st)
698 {
699 uint16_t size_asf; // ASF-specific Format Data size
700 uint32_t size_bmp; // BMP_HEADER-specific Format Data size
701 unsigned int tag;
702
703 st->codecpar->width = avio_rl32(pb);
704 st->codecpar->height = avio_rl32(pb);
705 avio_skip(pb, 1); // skip reserved flags
706 size_asf = avio_rl16(pb);
707 tag = ff_get_bmp_header(pb, st, &size_bmp);
708 st->codecpar->codec_tag = tag;
709 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
710 size_bmp = FFMAX(size_asf, size_bmp);
711
712 if (size_bmp > BMP_HEADER_SIZE &&
713 size_bmp < INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
714 int ret;
715 st->codecpar->extradata_size = size_bmp - BMP_HEADER_SIZE;
716 if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size +
717 AV_INPUT_BUFFER_PADDING_SIZE))) {
718 st->codecpar->extradata_size = 0;
719 return AVERROR(ENOMEM);
720 }
721 memset(st->codecpar->extradata + st->codecpar->extradata_size , 0,
722 AV_INPUT_BUFFER_PADDING_SIZE);
723 if ((ret = avio_read(pb, st->codecpar->extradata,
724 st->codecpar->extradata_size)) < 0)
725 return ret;
726 }
727 return 0;
728 }
729
asf_read_stream_properties(AVFormatContext * s,const GUIDParseTable * g)730 static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
731 {
732 ASFContext *asf = s->priv_data;
733 AVIOContext *pb = s->pb;
734 uint64_t size;
735 uint32_t err_data_len, ts_data_len; // type specific data length
736 uint16_t flags;
737 ff_asf_guid stream_type;
738 enum AVMediaType type;
739 int i, ret;
740 uint8_t stream_index;
741 AVStream *st;
742 ASFStream *asf_st;
743
744 // ASF file must not contain more than 128 streams according to the specification
745 if (asf->nb_streams >= ASF_MAX_STREAMS)
746 return AVERROR_INVALIDDATA;
747
748 size = avio_rl64(pb);
749 ff_get_guid(pb, &stream_type);
750 if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
751 type = AVMEDIA_TYPE_AUDIO;
752 else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
753 type = AVMEDIA_TYPE_VIDEO;
754 else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
755 type = AVMEDIA_TYPE_VIDEO;
756 else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
757 type = AVMEDIA_TYPE_DATA;
758 else if (!ff_guidcmp(&stream_type,
759 &ff_asf_ext_stream_embed_stream_header))
760 type = AVMEDIA_TYPE_UNKNOWN;
761 else
762 return AVERROR_INVALIDDATA;
763
764 ff_get_guid(pb, &stream_type); // error correction type
765 avio_skip(pb, 8); // skip the time offset
766 ts_data_len = avio_rl32(pb);
767 err_data_len = avio_rl32(pb);
768 flags = avio_rl16(pb); // bit 15 - Encrypted Content
769
770 stream_index = flags & ASF_STREAM_NUM;
771 for (i = 0; i < asf->nb_streams; i++)
772 if (stream_index == asf->asf_st[i]->stream_index) {
773 av_log(s, AV_LOG_WARNING,
774 "Duplicate stream found, this stream will be ignored.\n");
775 align_position(pb, asf->offset, size);
776 return 0;
777 }
778
779 st = avformat_new_stream(s, NULL);
780 if (!st)
781 return AVERROR(ENOMEM);
782 avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
783 st->codecpar->codec_type = type;
784 asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
785 if (!asf->asf_st[asf->nb_streams])
786 return AVERROR(ENOMEM);
787 asf_st = asf->asf_st[asf->nb_streams];
788 asf->nb_streams++;
789 asf_st->stream_index = stream_index;
790 asf_st->index = st->index;
791 asf_st->indexed = 0;
792 st->id = flags & ASF_STREAM_NUM;
793 av_init_packet(&asf_st->pkt.avpkt);
794 asf_st->pkt.data_size = 0;
795 avio_skip(pb, 4); // skip reserved field
796
797 switch (type) {
798 case AVMEDIA_TYPE_AUDIO:
799 asf_st->type = AVMEDIA_TYPE_AUDIO;
800 if ((ret = ff_get_wav_header(s, pb, st->codecpar, ts_data_len, 0)) < 0)
801 return ret;
802 break;
803 case AVMEDIA_TYPE_VIDEO:
804 asf_st->type = AVMEDIA_TYPE_VIDEO;
805 if ((ret = parse_video_info(pb, st)) < 0)
806 return ret;
807 break;
808 default:
809 avio_skip(pb, ts_data_len);
810 break;
811 }
812
813 if (err_data_len) {
814 if (type == AVMEDIA_TYPE_AUDIO) {
815 uint8_t span = avio_r8(pb);
816 if (span > 1) {
817 asf_st->span = span;
818 asf_st->virtual_pkt_len = avio_rl16(pb);
819 asf_st->virtual_chunk_len = avio_rl16(pb);
820 if (!asf_st->virtual_chunk_len || !asf_st->virtual_pkt_len)
821 return AVERROR_INVALIDDATA;
822 avio_skip(pb, err_data_len - 5);
823 } else
824 avio_skip(pb, err_data_len - 1);
825 } else
826 avio_skip(pb, err_data_len);
827 }
828
829 align_position(pb, asf->offset, size);
830
831 return 0;
832 }
833
set_language(AVFormatContext * s,const char * rfc1766,AVDictionary ** met)834 static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
835 {
836 // language abbr should contain at least 2 chars
837 if (rfc1766 && strlen(rfc1766) > 1) {
838 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
839 const char *iso6392 = ff_convert_lang_to(primary_tag,
840 AV_LANG_ISO639_2_BIBL);
841 if (iso6392)
842 if (av_dict_set(met, "language", iso6392, 0) < 0)
843 av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
844 }
845 }
846
asf_read_ext_stream_properties(AVFormatContext * s,const GUIDParseTable * g)847 static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
848 {
849 ASFContext *asf = s->priv_data;
850 AVIOContext *pb = s->pb;
851 AVStream *st = NULL;
852 ff_asf_guid guid;
853 uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
854 int i, ret;
855 uint32_t bitrate;
856 uint64_t start_time, end_time, time_per_frame;
857 uint64_t size = avio_rl64(pb);
858
859 start_time = avio_rl64(pb);
860 end_time = avio_rl64(pb);
861 bitrate = avio_rl32(pb);
862 avio_skip(pb, 28); // skip some unused values
863 st_num = avio_rl16(pb);
864 st_num &= ASF_STREAM_NUM;
865 lang_idx = avio_rl16(pb); // Stream Language ID Index
866 for (i = 0; i < asf->nb_streams; i++) {
867 if (st_num == asf->asf_st[i]->stream_index) {
868 st = s->streams[asf->asf_st[i]->index];
869 asf->asf_st[i]->lang_idx = lang_idx;
870 break;
871 }
872 }
873 time_per_frame = avio_rl64(pb); // average time per frame
874 if (st) {
875 st->start_time = start_time;
876 st->duration = end_time - start_time;
877 st->codecpar->bit_rate = bitrate;
878 st->avg_frame_rate.num = 10000000;
879 st->avg_frame_rate.den = time_per_frame;
880 }
881 nb_st_name = avio_rl16(pb);
882 nb_pay_exts = avio_rl16(pb);
883 for (i = 0; i < nb_st_name; i++) {
884 uint16_t len;
885
886 avio_rl16(pb); // Language ID Index
887 len = avio_rl16(pb);
888 avio_skip(pb, len);
889 }
890
891 for (i = 0; i < nb_pay_exts; i++) {
892 uint32_t len;
893 avio_skip(pb, 16); // Extension System ID
894 avio_skip(pb, 2); // Extension Data Size
895 len = avio_rl32(pb);
896 avio_skip(pb, len);
897 }
898
899 if ((ret = ff_get_guid(pb, &guid)) < 0) {
900 align_position(pb, asf->offset, size);
901
902 return 0;
903 }
904
905 g = find_guid(guid);
906 if (g && !(strcmp(g->name, "Stream Properties"))) {
907 if ((ret = g->read_object(s, g)) < 0)
908 return ret;
909 }
910
911 align_position(pb, asf->offset, size);
912 return 0;
913 }
914
asf_read_language_list(AVFormatContext * s,const GUIDParseTable * g)915 static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
916 {
917 ASFContext *asf = s->priv_data;
918 AVIOContext *pb = s->pb;
919 int i, ret;
920 uint64_t size = avio_rl64(pb);
921 uint16_t nb_langs = avio_rl16(pb);
922
923 if (nb_langs < ASF_MAX_STREAMS) {
924 for (i = 0; i < nb_langs; i++) {
925 size_t len;
926 len = avio_r8(pb);
927 if (!len)
928 len = 6;
929 if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
930 sizeof(asf->asf_sd[i].langs))) < 0) {
931 return ret;
932 }
933 }
934 }
935
936 align_position(pb, asf->offset, size);
937 return 0;
938 }
939
940 // returns data object offset when reading this object for the first time
asf_read_data(AVFormatContext * s,const GUIDParseTable * g)941 static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
942 {
943 ASFContext *asf = s->priv_data;
944 AVIOContext *pb = s->pb;
945 uint64_t size = asf->data_size = avio_rl64(pb);
946 int i;
947
948 if (!asf->data_reached) {
949 asf->data_reached = 1;
950 asf->data_offset = asf->offset;
951 }
952
953 for (i = 0; i < asf->nb_streams; i++) {
954 if (!(asf->b_flags & ASF_FLAG_BROADCAST))
955 s->streams[i]->duration = asf->duration;
956 }
957 asf->nb_mult_left = 0;
958 asf->sub_left = 0;
959 asf->state = PARSE_PACKET_HEADER;
960 asf->return_subpayload = 0;
961 asf->packet_size_internal = 0;
962 avio_skip(pb, 16); // skip File ID
963 size = avio_rl64(pb); // Total Data Packets
964 if (size != asf->nb_packets)
965 av_log(s, AV_LOG_WARNING,
966 "Number of Packets from File Properties Object is not equal to Total"
967 "Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
968 size, asf->nb_packets);
969 avio_skip(pb, 2); // skip reserved field
970 asf->first_packet_offset = avio_tell(pb);
971 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(asf->b_flags & ASF_FLAG_BROADCAST))
972 align_position(pb, asf->offset, asf->data_size);
973
974 return 0;
975 }
976
asf_read_simple_index(AVFormatContext * s,const GUIDParseTable * g)977 static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
978 {
979 ASFContext *asf = s->priv_data;
980 AVIOContext *pb = s->pb;
981 AVStream *st = NULL;
982 uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
983 uint32_t pkt_num, nb_entries;
984 int32_t prev_pkt_num = -1;
985 int i;
986 int64_t offset;
987 uint64_t size = avio_rl64(pb);
988
989 // simple index objects should be ordered by stream number, this loop tries to find
990 // the first not indexed video stream
991 for (i = 0; i < asf->nb_streams; i++) {
992 if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
993 asf->asf_st[i]->indexed = 1;
994 st = s->streams[asf->asf_st[i]->index];
995 break;
996 }
997 }
998 if (!st) {
999 avio_skip(pb, size - 24); // if there's no video stream, skip index object
1000 return 0;
1001 }
1002 avio_skip(pb, 16); // skip File ID
1003 interval = avio_rl64(pb);
1004 avio_skip(pb, 4);
1005 nb_entries = avio_rl32(pb);
1006 for (i = 0; i < nb_entries; i++) {
1007 pkt_num = avio_rl32(pb);
1008 offset = avio_skip(pb, 2);
1009 if (offset < 0) {
1010 av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
1011 return offset;
1012 }
1013 if (prev_pkt_num != pkt_num) {
1014 av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
1015 pkt_num, av_rescale(interval, i, 10000),
1016 asf->packet_size, 0, AVINDEX_KEYFRAME);
1017 prev_pkt_num = pkt_num;
1018 }
1019 }
1020 asf->is_simple_index = 1;
1021 align_position(pb, asf->offset, size);
1022
1023 return 0;
1024 }
1025
1026 static const GUIDParseTable gdef[] = {
1027 { "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
1028 { "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
1029 { "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
1030 { "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
1031 { "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
1032 { "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
1033 { "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
1034 { "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
1035 { "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
1036 { "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
1037 { "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
1038 { "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
1039 { "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
1040 { "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1041 { "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
1042 { "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1043 { "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
1044 { "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
1045 { "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1046 { "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
1047 { "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1048 { "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1049 { "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
1050 { "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
1051 { "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 },
1052 { "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
1053 { "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
1054 { "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
1055 { "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1056 { "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
1057 { "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
1058 { "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
1059 { "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1060 { "Content Encryption System Windows Media DRM Network Devices",
1061 { 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
1062 { "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1063 { "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1064 { "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
1065 { "Bandwidth Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1066 { "Bandwidth Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
1067 { "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
1068 { "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 },
1069 { "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 },
1070 { "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 },
1071 { "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 },
1072 { "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 },
1073 { "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 },
1074 };
1075
1076 #define READ_LEN(flag, name, len) \
1077 do { \
1078 if ((flag) == name ## IS_BYTE) \
1079 len = avio_r8(pb); \
1080 else if ((flag) == name ## IS_WORD) \
1081 len = avio_rl16(pb); \
1082 else if ((flag) == name ## IS_DWORD) \
1083 len = avio_rl32(pb); \
1084 else \
1085 len = 0; \
1086 } while(0)
1087
asf_read_subpayload(AVFormatContext * s,AVPacket * pkt,int is_header)1088 static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
1089 {
1090 ASFContext *asf = s->priv_data;
1091 AVIOContext *pb = s->pb;
1092 uint8_t sub_len;
1093 int ret, i;
1094
1095 if (is_header) {
1096 asf->dts_delta = avio_r8(pb);
1097 if (asf->nb_mult_left) {
1098 asf->mult_sub_len = avio_rl16(pb); // total
1099 }
1100 asf->sub_header_offset = avio_tell(pb);
1101 asf->nb_sub = 0;
1102 asf->sub_left = 1;
1103 }
1104 sub_len = avio_r8(pb);
1105 if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
1106 return ret;
1107 for (i = 0; i < asf->nb_streams; i++) {
1108 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1109 pkt->stream_index = asf->asf_st[i]->index;
1110 break;
1111 }
1112 }
1113 asf->return_subpayload = 1;
1114 if (!sub_len)
1115 asf->return_subpayload = 0;
1116
1117 if (sub_len)
1118 asf->nb_sub++;
1119 pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
1120 if (asf->nb_mult_left && (avio_tell(pb) >=
1121 (asf->sub_header_offset + asf->mult_sub_len))) {
1122 asf->sub_left = 0;
1123 asf->nb_mult_left--;
1124 }
1125 if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
1126 asf->sub_left = 0;
1127 if (!asf->nb_mult_left) {
1128 avio_skip(pb, asf->pad_len);
1129 if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
1130 if (!asf->packet_size)
1131 return AVERROR_INVALIDDATA;
1132 av_log(s, AV_LOG_WARNING,
1133 "Position %"PRId64" wrong, should be %"PRId64"\n",
1134 avio_tell(pb), asf->packet_offset + asf->packet_size);
1135 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1136 }
1137 }
1138 }
1139
1140 return 0;
1141 }
1142
reset_packet(ASFPacket * asf_pkt)1143 static void reset_packet(ASFPacket *asf_pkt)
1144 {
1145 asf_pkt->size_left = 0;
1146 asf_pkt->data_size = 0;
1147 asf_pkt->duration = 0;
1148 asf_pkt->flags = 0;
1149 asf_pkt->dts = 0;
1150 asf_pkt->duration = 0;
1151 av_packet_unref(&asf_pkt->avpkt);
1152 av_init_packet(&asf_pkt->avpkt);
1153 }
1154
asf_read_replicated_data(AVFormatContext * s,ASFPacket * asf_pkt)1155 static int asf_read_replicated_data(AVFormatContext *s, ASFPacket *asf_pkt)
1156 {
1157 ASFContext *asf = s->priv_data;
1158 AVIOContext *pb = s->pb;
1159 int ret, data_size;
1160
1161 if (!asf_pkt->data_size) {
1162 data_size = avio_rl32(pb); // read media object size
1163 if (data_size <= 0)
1164 return AVERROR_INVALIDDATA;
1165 if ((ret = av_new_packet(&asf_pkt->avpkt, data_size)) < 0)
1166 return ret;
1167 asf_pkt->data_size = asf_pkt->size_left = data_size;
1168 } else
1169 avio_skip(pb, 4); // reading of media object size is already done
1170 asf_pkt->dts = avio_rl32(pb); // read presentation time
1171 if (asf->rep_data_len >= 8)
1172 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1173
1174 return 0;
1175 }
1176
asf_read_multiple_payload(AVFormatContext * s,AVPacket * pkt,ASFPacket * asf_pkt)1177 static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
1178 ASFPacket *asf_pkt)
1179 {
1180 ASFContext *asf = s->priv_data;
1181 AVIOContext *pb = s->pb;
1182 uint16_t pay_len;
1183 unsigned char *p;
1184 int ret;
1185 int skip = 0;
1186
1187 // if replicated length is 1, subpayloads are present
1188 if (asf->rep_data_len == 1) {
1189 asf->sub_left = 1;
1190 asf->state = READ_MULTI_SUB;
1191 pkt->flags = asf_pkt->flags;
1192 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1193 return ret;
1194 } else {
1195 if (asf->rep_data_len)
1196 if ((ret = asf_read_replicated_data(s, asf_pkt)) < 0)
1197 return ret;
1198 pay_len = avio_rl16(pb); // payload length should be WORD
1199 if (pay_len > asf->packet_size) {
1200 av_log(s, AV_LOG_ERROR,
1201 "Error: invalid data packet size, pay_len %"PRIu16", "
1202 "asf->packet_size %"PRIu32", offset %"PRId64".\n",
1203 pay_len, asf->packet_size, avio_tell(pb));
1204 return AVERROR_INVALIDDATA;
1205 }
1206 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1207 if (pay_len > asf_pkt->size_left) {
1208 av_log(s, AV_LOG_ERROR,
1209 "Error: invalid buffer size, pay_len %d, data size left %d.\n",
1210 pay_len, asf_pkt->size_left);
1211 skip = pay_len - asf_pkt->size_left;
1212 pay_len = asf_pkt->size_left;
1213 }
1214 if (asf_pkt->size_left <= 0)
1215 return AVERROR_INVALIDDATA;
1216 if ((ret = avio_read(pb, p, pay_len)) < 0)
1217 return ret;
1218 if (s->key && s->keylen == 20)
1219 ff_asfcrypt_dec(s->key, p, ret);
1220 avio_skip(pb, skip);
1221 asf_pkt->size_left -= pay_len;
1222 asf->nb_mult_left--;
1223 }
1224
1225 return 0;
1226 }
1227
asf_read_single_payload(AVFormatContext * s,ASFPacket * asf_pkt)1228 static int asf_read_single_payload(AVFormatContext *s, ASFPacket *asf_pkt)
1229 {
1230 ASFContext *asf = s->priv_data;
1231 AVIOContext *pb = s->pb;
1232 int64_t offset;
1233 uint64_t size;
1234 unsigned char *p;
1235 int ret, data_size;
1236
1237 if (!asf_pkt->data_size) {
1238 data_size = avio_rl32(pb); // read media object size
1239 if (data_size <= 0)
1240 return AVERROR_EOF;
1241 if ((ret = av_new_packet(&asf_pkt->avpkt, data_size)) < 0)
1242 return ret;
1243 asf_pkt->data_size = asf_pkt->size_left = data_size;
1244 } else
1245 avio_skip(pb, 4); // skip media object size
1246 asf_pkt->dts = avio_rl32(pb); // read presentation time
1247 if (asf->rep_data_len >= 8)
1248 avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
1249 offset = avio_tell(pb);
1250
1251 // size of the payload - size of the packet without header and padding
1252 if (asf->packet_size_internal)
1253 size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
1254 else
1255 size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
1256 if (size > asf->packet_size) {
1257 av_log(s, AV_LOG_ERROR,
1258 "Error: invalid data packet size, offset %"PRId64".\n",
1259 avio_tell(pb));
1260 return AVERROR_INVALIDDATA;
1261 }
1262 p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
1263 if (size > asf_pkt->size_left || asf_pkt->size_left <= 0)
1264 return AVERROR_INVALIDDATA;
1265 if (asf_pkt->size_left > size)
1266 asf_pkt->size_left -= size;
1267 else
1268 asf_pkt->size_left = 0;
1269 if ((ret = avio_read(pb, p, size)) < 0)
1270 return ret;
1271 if (s->key && s->keylen == 20)
1272 ff_asfcrypt_dec(s->key, p, ret);
1273 if (asf->packet_size_internal)
1274 avio_skip(pb, asf->packet_size - asf->packet_size_internal);
1275 avio_skip(pb, asf->pad_len); // skip padding
1276
1277 return 0;
1278 }
1279
asf_read_payload(AVFormatContext * s,AVPacket * pkt)1280 static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
1281 {
1282 ASFContext *asf = s->priv_data;
1283 AVIOContext *pb = s->pb;
1284 int ret, i;
1285 ASFPacket *asf_pkt = NULL;
1286
1287 if (!asf->sub_left) {
1288 uint32_t off_len, media_len;
1289 uint8_t stream_num;
1290
1291 stream_num = avio_r8(pb);
1292 asf->stream_index = stream_num & ASF_STREAM_NUM;
1293 for (i = 0; i < asf->nb_streams; i++) {
1294 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1295 asf_pkt = &asf->asf_st[i]->pkt;
1296 asf_pkt->stream_index = asf->asf_st[i]->index;
1297 break;
1298 }
1299 }
1300 if (!asf_pkt) {
1301 if (asf->packet_offset + asf->packet_size <= asf->data_offset + asf->data_size) {
1302 if (!asf->packet_size) {
1303 av_log(s, AV_LOG_ERROR, "Invalid packet size 0.\n");
1304 return AVERROR_INVALIDDATA;
1305 }
1306 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1307 av_log(s, AV_LOG_WARNING, "Skipping the stream with the invalid stream index %d.\n",
1308 asf->stream_index);
1309 return AVERROR(EAGAIN);
1310 } else
1311 return AVERROR_INVALIDDATA;
1312 }
1313
1314 if (stream_num >> 7)
1315 asf_pkt->flags |= AV_PKT_FLAG_KEY;
1316 READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
1317 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
1318 READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
1319 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
1320 READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
1321 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
1322 if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
1323 av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
1324 reset_packet(asf_pkt);
1325 }
1326 asf_pkt->frame_num = media_len;
1327 asf->sub_dts = off_len;
1328 if (asf->nb_mult_left) {
1329 if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
1330 return ret;
1331 } else if (asf->rep_data_len == 1) {
1332 asf->sub_left = 1;
1333 asf->state = READ_SINGLE;
1334 pkt->flags = asf_pkt->flags;
1335 if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
1336 return ret;
1337 } else {
1338 if ((ret = asf_read_single_payload(s, asf_pkt)) < 0)
1339 return ret;
1340 }
1341 } else {
1342 for (i = 0; i <= asf->nb_streams; i++) {
1343 if (asf->stream_index == asf->asf_st[i]->stream_index) {
1344 asf_pkt = &asf->asf_st[i]->pkt;
1345 break;
1346 }
1347 }
1348 if (!asf_pkt)
1349 return AVERROR_INVALIDDATA;
1350 pkt->flags = asf_pkt->flags;
1351 pkt->dts = asf_pkt->dts;
1352 pkt->stream_index = asf->asf_st[i]->index;
1353 if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
1354 return ret;
1355 }
1356
1357 return 0;
1358 }
1359
asf_read_packet_header(AVFormatContext * s)1360 static int asf_read_packet_header(AVFormatContext *s)
1361 {
1362 ASFContext *asf = s->priv_data;
1363 AVIOContext *pb = s->pb;
1364 uint64_t size;
1365 uint32_t av_unused seq;
1366 unsigned char error_flags, len_flags, pay_flags;
1367
1368 asf->packet_offset = avio_tell(pb);
1369 error_flags = avio_r8(pb); // read Error Correction Flags
1370 if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT) {
1371 if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
1372 size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
1373 avio_skip(pb, size);
1374 }
1375 len_flags = avio_r8(pb);
1376 } else
1377 len_flags = error_flags;
1378 asf->prop_flags = avio_r8(pb);
1379 READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
1380 ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
1381 READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
1382 ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
1383 READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
1384 ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
1385 asf->send_time = avio_rl32(pb); // send time
1386 avio_skip(pb, 2); // skip duration
1387 if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
1388 pay_flags = avio_r8(pb);
1389 asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
1390 }
1391
1392 return 0;
1393 }
1394
asf_deinterleave(AVFormatContext * s,ASFPacket * asf_pkt,int st_num)1395 static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
1396 {
1397 ASFContext *asf = s->priv_data;
1398 ASFStream *asf_st = asf->asf_st[st_num];
1399 unsigned char *p = asf_pkt->avpkt.data;
1400 uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
1401 uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
1402 int nchunks = pkt_len / chunk_len;
1403 AVPacket pkt;
1404 int pos = 0, j, l, ret;
1405
1406
1407 if ((ret = av_new_packet(&pkt, asf_pkt->data_size)) < 0)
1408 return ret;
1409
1410 while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
1411 if (pos >= asf_pkt->data_size) {
1412 break;
1413 }
1414 for (l = 0; l < pkt_len; l++) {
1415 if (pos >= asf_pkt->data_size) {
1416 break;
1417 }
1418 for (j = 0; j < asf_st->span; j++) {
1419 if ((pos + chunk_len) >= asf_pkt->data_size)
1420 break;
1421 memcpy(pkt.data + pos,
1422 p + (j * nchunks + l) * chunk_len,
1423 chunk_len);
1424 pos += chunk_len;
1425 }
1426 }
1427 p += asf_st->span * pkt_len;
1428 if (p > asf_pkt->avpkt.data + asf_pkt->data_size)
1429 break;
1430 }
1431 av_packet_unref(&asf_pkt->avpkt);
1432 asf_pkt->avpkt = pkt;
1433
1434 return 0;
1435 }
1436
asf_read_packet(AVFormatContext * s,AVPacket * pkt)1437 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1438 {
1439 ASFContext *asf = s->priv_data;
1440 AVIOContext *pb = s->pb;
1441 int ret, i;
1442
1443 if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
1444 !(asf->b_flags & ASF_FLAG_BROADCAST))
1445 return AVERROR_EOF;
1446 while (!pb->eof_reached) {
1447 if (asf->state == PARSE_PACKET_HEADER) {
1448 asf_read_packet_header(s);
1449 if (pb->eof_reached)
1450 break;
1451 if (!asf->nb_mult_left)
1452 asf->state = READ_SINGLE;
1453 else
1454 asf->state = READ_MULTI;
1455 }
1456 ret = asf_read_payload(s, pkt);
1457 if (ret == AVERROR(EAGAIN)) {
1458 asf->state = PARSE_PACKET_HEADER;
1459 continue;
1460 }
1461 else if (ret < 0)
1462 return ret;
1463
1464 switch (asf->state) {
1465 case READ_SINGLE:
1466 if (!asf->sub_left)
1467 asf->state = PARSE_PACKET_HEADER;
1468 break;
1469 case READ_MULTI_SUB:
1470 if (!asf->sub_left && !asf->nb_mult_left) {
1471 asf->state = PARSE_PACKET_HEADER;
1472 if (!asf->return_subpayload &&
1473 (avio_tell(pb) <= asf->packet_offset +
1474 asf->packet_size - asf->pad_len))
1475 avio_skip(pb, asf->pad_len); // skip padding
1476 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1477 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1478 } else if (!asf->sub_left)
1479 asf->state = READ_MULTI;
1480 break;
1481 case READ_MULTI:
1482 if (!asf->nb_mult_left) {
1483 asf->state = PARSE_PACKET_HEADER;
1484 if (!asf->return_subpayload &&
1485 (avio_tell(pb) <= asf->packet_offset +
1486 asf->packet_size - asf->pad_len))
1487 avio_skip(pb, asf->pad_len); // skip padding
1488 if (asf->packet_offset + asf->packet_size > avio_tell(pb))
1489 avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
1490 }
1491 break;
1492 }
1493 if (asf->return_subpayload) {
1494 asf->return_subpayload = 0;
1495 return 0;
1496 }
1497 for (i = 0; i < asf->nb_streams; i++) {
1498 ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
1499 if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
1500 if (asf->asf_st[i]->span > 1 &&
1501 asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
1502 if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
1503 return ret;
1504 av_packet_move_ref(pkt, &asf_pkt->avpkt);
1505 pkt->stream_index = asf->asf_st[i]->index;
1506 pkt->flags = asf_pkt->flags;
1507 pkt->dts = asf_pkt->dts - asf->preroll;
1508 asf_pkt->data_size = 0;
1509 asf_pkt->frame_num = 0;
1510 return 0;
1511 }
1512 }
1513 }
1514
1515 if (pb->eof_reached)
1516 return AVERROR_EOF;
1517
1518 return 0;
1519 }
1520
asf_read_close(AVFormatContext * s)1521 static int asf_read_close(AVFormatContext *s)
1522 {
1523 ASFContext *asf = s->priv_data;
1524 int i;
1525
1526 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1527 av_dict_free(&asf->asf_sd[i].asf_met);
1528 if (i < asf->nb_streams) {
1529 av_packet_unref(&asf->asf_st[i]->pkt.avpkt);
1530 av_freep(&asf->asf_st[i]);
1531 }
1532 }
1533
1534 asf->nb_streams = 0;
1535 return 0;
1536 }
1537
reset_packet_state(AVFormatContext * s)1538 static void reset_packet_state(AVFormatContext *s)
1539 {
1540 ASFContext *asf = s->priv_data;
1541 int i;
1542
1543 asf->state = PARSE_PACKET_HEADER;
1544 asf->offset = 0;
1545 asf->return_subpayload = 0;
1546 asf->sub_left = 0;
1547 asf->sub_header_offset = 0;
1548 asf->packet_offset = asf->first_packet_offset;
1549 asf->pad_len = 0;
1550 asf->rep_data_len = 0;
1551 asf->dts_delta = 0;
1552 asf->mult_sub_len = 0;
1553 asf->nb_mult_left = 0;
1554 asf->nb_sub = 0;
1555 asf->prop_flags = 0;
1556 asf->sub_dts = 0;
1557 for (i = 0; i < asf->nb_streams; i++) {
1558 ASFPacket *pkt = &asf->asf_st[i]->pkt;
1559 pkt->size_left = 0;
1560 pkt->data_size = 0;
1561 pkt->duration = 0;
1562 pkt->flags = 0;
1563 pkt->dts = 0;
1564 pkt->duration = 0;
1565 av_packet_unref(&pkt->avpkt);
1566 av_init_packet(&pkt->avpkt);
1567 }
1568 }
1569
1570 /*
1571 * Find a timestamp for the requested position within the payload
1572 * where the pos (position) is the offset inside the Data Object.
1573 * When position is not on the packet boundary, asf_read_timestamp tries
1574 * to find the closest packet offset after this position. If this packet
1575 * is a key frame, this packet timestamp is read and an index entry is created
1576 * for the packet. If this packet belongs to the requested stream,
1577 * asf_read_timestamp upgrades pos to the packet beginning offset and
1578 * returns this packet's dts. So returned dts is the dts of the first key frame with
1579 * matching stream number after given position.
1580 */
asf_read_timestamp(AVFormatContext * s,int stream_index,int64_t * pos,int64_t pos_limit)1581 static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
1582 int64_t *pos, int64_t pos_limit)
1583 {
1584 ASFContext *asf = s->priv_data;
1585 int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
1586 AVPacket pkt;
1587 int n;
1588
1589 data_end = asf->data_offset + asf->data_size;
1590
1591 n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
1592 asf->packet_size;
1593 n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
1594 pkt_pos = asf->first_packet_offset + n * asf->packet_size;
1595
1596 avio_seek(s->pb, pkt_pos, SEEK_SET);
1597 pkt_offset = pkt_pos;
1598
1599 reset_packet_state(s);
1600 while (avio_tell(s->pb) < data_end) {
1601
1602 int i, ret, st_found;
1603
1604 av_init_packet(&pkt);
1605 pkt_offset = avio_tell(s->pb);
1606 if ((ret = asf_read_packet(s, &pkt)) < 0) {
1607 dts = AV_NOPTS_VALUE;
1608 return ret;
1609 }
1610 // ASFPacket may contain fragments of packets belonging to different streams,
1611 // pkt_offset is the offset of the first fragment within it.
1612 if ((pkt_offset >= (pkt_pos + asf->packet_size)))
1613 pkt_pos += asf->packet_size;
1614 for (i = 0; i < asf->nb_streams; i++) {
1615 ASFStream *st = asf->asf_st[i];
1616
1617 st_found = 0;
1618 if (pkt.flags & AV_PKT_FLAG_KEY) {
1619 dts = pkt.dts;
1620 if (dts) {
1621 av_add_index_entry(s->streams[pkt.stream_index], pkt_pos,
1622 dts, pkt.size, 0, AVINDEX_KEYFRAME);
1623 if (stream_index == st->index) {
1624 st_found = 1;
1625 break;
1626 }
1627 }
1628 }
1629 }
1630 if (st_found)
1631 break;
1632 av_packet_unref(&pkt);
1633 }
1634 *pos = pkt_pos;
1635
1636 av_packet_unref(&pkt);
1637 return dts;
1638 }
1639
asf_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)1640 static int asf_read_seek(AVFormatContext *s, int stream_index,
1641 int64_t timestamp, int flags)
1642 {
1643 ASFContext *asf = s->priv_data;
1644 int idx, ret;
1645
1646 if (s->streams[stream_index]->nb_index_entries && asf->is_simple_index) {
1647 idx = av_index_search_timestamp(s->streams[stream_index], timestamp, flags);
1648 if (idx < 0 || idx >= s->streams[stream_index]->nb_index_entries)
1649 return AVERROR_INVALIDDATA;
1650 avio_seek(s->pb, s->streams[stream_index]->index_entries[idx].pos, SEEK_SET);
1651 } else {
1652 if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
1653 return ret;
1654 }
1655
1656 reset_packet_state(s);
1657
1658 return 0;
1659 }
1660
find_guid(ff_asf_guid guid)1661 static const GUIDParseTable *find_guid(ff_asf_guid guid)
1662 {
1663 int j, ret;
1664 const GUIDParseTable *g;
1665
1666 swap_guid(guid);
1667 g = gdef;
1668 for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
1669 if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
1670 return g;
1671 g++;
1672 }
1673
1674 return NULL;
1675 }
1676
detect_unknown_subobject(AVFormatContext * s,int64_t offset,int64_t size)1677 static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
1678 {
1679 ASFContext *asf = s->priv_data;
1680 AVIOContext *pb = s->pb;
1681 const GUIDParseTable *g = NULL;
1682 ff_asf_guid guid;
1683 int ret;
1684
1685 if (offset > INT64_MAX - size)
1686 return AVERROR_INVALIDDATA;
1687
1688 while (avio_tell(pb) <= offset + size) {
1689 if (avio_tell(pb) == asf->offset)
1690 break;
1691 asf->offset = avio_tell(pb);
1692 if ((ret = ff_get_guid(pb, &guid)) < 0)
1693 return ret;
1694 g = find_guid(guid);
1695 if (g) {
1696 if ((ret = g->read_object(s, g)) < 0)
1697 return ret;
1698 } else {
1699 GUIDParseTable g2;
1700
1701 g2.name = "Unknown";
1702 g2.is_subobject = 1;
1703 asf_read_unknown(s, &g2);
1704 }
1705 }
1706
1707 return 0;
1708 }
1709
asf_read_header(AVFormatContext * s)1710 static int asf_read_header(AVFormatContext *s)
1711 {
1712 ASFContext *asf = s->priv_data;
1713 AVIOContext *pb = s->pb;
1714 const GUIDParseTable *g = NULL;
1715 ff_asf_guid guid;
1716 int i, ret;
1717 uint64_t size;
1718
1719 asf->preroll = 0;
1720 asf->is_simple_index = 0;
1721 ff_get_guid(pb, &guid);
1722 if (ff_guidcmp(&guid, &ff_asf_header))
1723 return AVERROR_INVALIDDATA;
1724 avio_skip(pb, 8); // skip header object size
1725 avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
1726 asf->data_reached = 0;
1727
1728 /* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
1729 * for the first time,
1730 * Index object is processed and got eof and then seeking back to the Data is performed.
1731 */
1732 while (1) {
1733 // for the cases when object size is invalid
1734 if (avio_tell(pb) == asf->offset)
1735 break;
1736 asf->offset = avio_tell(pb);
1737 if ((ret = ff_get_guid(pb, &guid)) < 0) {
1738 if (ret == AVERROR_EOF && asf->data_reached)
1739 break;
1740 else
1741 goto failed;
1742 }
1743 g = find_guid(guid);
1744 if (g) {
1745 asf->unknown_offset = asf->offset;
1746 asf->is_header = 1;
1747 if ((ret = g->read_object(s, g)) < 0)
1748 goto failed;
1749 } else {
1750 size = avio_rl64(pb);
1751 align_position(pb, asf->offset, size);
1752 }
1753 if (asf->data_reached &&
1754 (!(pb->seekable & AVIO_SEEKABLE_NORMAL) ||
1755 (asf->b_flags & ASF_FLAG_BROADCAST)))
1756 break;
1757 }
1758
1759 if (!asf->data_reached) {
1760 av_log(s, AV_LOG_ERROR, "Data Object was not found.\n");
1761 ret = AVERROR_INVALIDDATA;
1762 goto failed;
1763 }
1764 if (pb->seekable & AVIO_SEEKABLE_NORMAL)
1765 avio_seek(pb, asf->first_packet_offset, SEEK_SET);
1766
1767 for (i = 0; i < asf->nb_streams; i++) {
1768 const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
1769 AVStream *st = s->streams[asf->asf_st[i]->index];
1770 set_language(s, rfc1766, &st->metadata);
1771 }
1772
1773 for (i = 0; i < ASF_MAX_STREAMS; i++) {
1774 AVStream *st = NULL;
1775
1776 st = find_stream(s, i);
1777 if (st) {
1778 av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
1779 if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
1780 st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
1781 st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
1782 }
1783 }
1784 }
1785
1786 return 0;
1787
1788 failed:
1789 asf_read_close(s);
1790 return ret;
1791 }
1792
1793 AVInputFormat ff_asf_o_demuxer = {
1794 .name = "asf_o",
1795 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1796 .priv_data_size = sizeof(ASFContext),
1797 .read_probe = asf_probe,
1798 .read_header = asf_read_header,
1799 .read_packet = asf_read_packet,
1800 .read_close = asf_read_close,
1801 .read_timestamp = asf_read_timestamp,
1802 .read_seek = asf_read_seek,
1803 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1804 };
1805