2 * ASF compatible demuxer
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/common.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
31 #include "avio_internal.h"
32 #include "avlanguage.h"
41 int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
42 ASFStream streams[128]; ///< it's max number and it's not that big
43 uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
45 char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US)
46 /* non streamed additonnal info */
49 /* only for reading */
50 uint64_t data_offset; ///< beginning of the first data packet
51 uint64_t data_object_offset; ///< data object offset (excl. GUID & size)
52 uint64_t data_object_size; ///< size of the data object
60 int packet_segsizetype;
63 int packet_replic_size;
66 unsigned int packet_frag_offset;
67 unsigned int packet_frag_size;
68 int64_t packet_frag_timestamp;
69 int packet_multi_size;
71 int packet_time_delta;
72 int packet_time_start;
77 ASFStream *asf_st; ///< currently decoded stream
82 static const AVOption options[] = {
83 { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
87 static const AVClass asf_class = {
88 .class_name = "asf demuxer",
89 .item_name = av_default_item_name,
91 .version = LIBAVUTIL_VERSION_INT,
97 #define ASF_MAX_STREAMS 127
98 #define FRAME_HEADER_SIZE 17
99 // Fix Me! FRAME_HEADER_SIZE may be different.
101 static const ff_asf_guid index_guid = {
102 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
106 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
107 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
110 #define PRINT_IF_GUID(g, cmp) \
111 if (!ff_guidcmp(g, &cmp)) \
112 av_dlog(NULL, "(GUID: %s) ", # cmp)
114 static void print_guid(ff_asf_guid *g)
117 PRINT_IF_GUID(g, ff_asf_header);
118 else PRINT_IF_GUID(g, ff_asf_file_header);
119 else PRINT_IF_GUID(g, ff_asf_stream_header);
120 else PRINT_IF_GUID(g, ff_asf_audio_stream);
121 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
122 else PRINT_IF_GUID(g, ff_asf_video_stream);
123 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
124 else PRINT_IF_GUID(g, ff_asf_command_stream);
125 else PRINT_IF_GUID(g, ff_asf_comment_header);
126 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
127 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
128 else PRINT_IF_GUID(g, ff_asf_data_header);
129 else PRINT_IF_GUID(g, index_guid);
130 else PRINT_IF_GUID(g, ff_asf_head1_guid);
131 else PRINT_IF_GUID(g, ff_asf_head2_guid);
132 else PRINT_IF_GUID(g, ff_asf_my_guid);
133 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
134 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
135 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
136 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
137 else PRINT_IF_GUID(g, ff_asf_metadata_header);
138 else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
139 else PRINT_IF_GUID(g, ff_asf_marker_header);
140 else PRINT_IF_GUID(g, stream_bitrate_guid);
141 else PRINT_IF_GUID(g, ff_asf_language_guid);
143 av_dlog(NULL, "(GUID: unknown) ");
144 for (i = 0; i < 16; i++)
145 av_dlog(NULL, " 0x%02x,", (*g)[i]);
146 av_dlog(NULL, "}\n");
150 #define print_guid(g)
153 static int asf_probe(AVProbeData *pd)
155 /* check file header */
156 if (!ff_guidcmp(pd->buf, &ff_asf_header))
157 return AVPROBE_SCORE_MAX;
162 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
163 * but 16 bit for "Metadata Object" and "Metadata Library Object" */
164 static int get_value(AVIOContext *pb, int type, int type2_size)
168 return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
170 return avio_rl32(pb);
172 return avio_rl64(pb);
174 return avio_rl16(pb);
180 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
181 * but in reality this is only loosely similar */
182 static int asf_read_picture(AVFormatContext *s, int len)
184 AVPacket pkt = { 0 };
185 const CodecMime *mime = ff_id3v2_mime_tags;
186 enum AVCodecID id = AV_CODEC_ID_NONE;
188 uint8_t *desc = NULL;
190 int ret, type, picsize, desc_len;
192 /* type + picsize + mime + desc */
193 if (len < 1 + 4 + 2 + 2) {
194 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
195 return AVERROR_INVALIDDATA;
199 type = avio_r8(s->pb);
201 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
202 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
206 /* picture data size */
207 picsize = avio_rl32(s->pb);
210 /* picture MIME type */
211 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
212 while (mime->id != AV_CODEC_ID_NONE) {
213 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
219 if (id == AV_CODEC_ID_NONE) {
220 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
225 if (picsize >= len) {
226 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
228 return AVERROR_INVALIDDATA;
231 /* picture description */
232 desc_len = (len - picsize) * 2 + 1;
233 desc = av_malloc(desc_len);
235 return AVERROR(ENOMEM);
236 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
238 ret = av_get_packet(s->pb, &pkt, picsize);
242 st = avformat_new_stream(s, NULL);
244 ret = AVERROR(ENOMEM);
247 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
248 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
249 st->codec->codec_id = id;
250 st->attached_pic = pkt;
251 st->attached_pic.stream_index = st->index;
252 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
255 av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
259 av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
265 av_free_packet(&pkt);
269 static void get_id3_tag(AVFormatContext *s, int len)
271 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
273 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
274 if (id3v2_extra_meta)
275 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
276 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
279 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
282 int64_t off = avio_tell(s->pb);
284 if ((unsigned)len >= (UINT_MAX - 1) / 2)
287 value = av_malloc(2 * len + 1);
291 if (type == 0) { // UTF16-LE
292 avio_get_str16le(s->pb, len, value, 2 * len + 1);
293 } else if (type == 1) { // byte array
294 if (!strcmp(key, "WM/Picture")) { // handle cover art
295 asf_read_picture(s, len);
296 } else if (!strcmp(key, "ID3")) { // handle ID3 tag
299 av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
302 } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
303 uint64_t num = get_value(s->pb, type, type2_size);
304 snprintf(value, len, "%"PRIu64, num);
305 } else if (type == 6) { // (don't) handle GUID
306 av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
309 av_log(s, AV_LOG_DEBUG,
310 "Unsupported value type %d in tag %s.\n", type, key);
314 av_dict_set(&s->metadata, key, value, 0);
318 avio_seek(s->pb, off + len, SEEK_SET);
321 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
323 ASFContext *asf = s->priv_data;
324 AVIOContext *pb = s->pb;
326 ff_get_guid(pb, &asf->hdr.guid);
327 asf->hdr.file_size = avio_rl64(pb);
328 asf->hdr.create_time = avio_rl64(pb);
329 avio_rl64(pb); /* number of packets */
330 asf->hdr.play_time = avio_rl64(pb);
331 asf->hdr.send_time = avio_rl64(pb);
332 asf->hdr.preroll = avio_rl32(pb);
333 asf->hdr.ignore = avio_rl32(pb);
334 asf->hdr.flags = avio_rl32(pb);
335 asf->hdr.min_pktsize = avio_rl32(pb);
336 asf->hdr.max_pktsize = avio_rl32(pb);
337 if (asf->hdr.min_pktsize >= (1U << 29))
338 return AVERROR_INVALIDDATA;
339 asf->hdr.max_bitrate = avio_rl32(pb);
340 s->packet_size = asf->hdr.max_pktsize;
345 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
347 ASFContext *asf = s->priv_data;
348 AVIOContext *pb = s->pb;
352 enum AVMediaType type;
353 int type_specific_size, sizeX;
355 int64_t pos1, pos2, start_time;
356 int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
358 if (s->nb_streams == ASF_MAX_STREAMS) {
359 av_log(s, AV_LOG_ERROR, "too many streams\n");
360 return AVERROR(EINVAL);
363 pos1 = avio_tell(pb);
365 st = avformat_new_stream(s, NULL);
367 return AVERROR(ENOMEM);
368 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
369 asf_st = av_mallocz(sizeof(ASFStream));
371 return AVERROR(ENOMEM);
372 st->priv_data = asf_st;
374 start_time = asf->hdr.preroll;
376 asf_st->stream_language_index = 128; // invalid stream index means no language info
378 if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
379 st->duration = asf->hdr.play_time /
380 (10000000 / 1000) - start_time;
384 test_for_ext_stream_audio = 0;
385 if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
386 type = AVMEDIA_TYPE_AUDIO;
387 } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
388 type = AVMEDIA_TYPE_VIDEO;
389 } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
390 type = AVMEDIA_TYPE_VIDEO;
391 st->codec->codec_id = AV_CODEC_ID_MJPEG;
392 } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
393 type = AVMEDIA_TYPE_DATA;
394 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
395 test_for_ext_stream_audio = 1;
396 type = AVMEDIA_TYPE_UNKNOWN;
401 avio_skip(pb, 8); /* total_size */
402 type_specific_size = avio_rl32(pb);
404 st->id = avio_rl16(pb) & 0x7f; /* stream id */
405 // mapping of asf ID to AV stream ID;
406 asf->asfid2avid[st->id] = s->nb_streams - 1;
410 if (test_for_ext_stream_audio) {
412 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
413 type = AVMEDIA_TYPE_AUDIO;
424 st->codec->codec_type = type;
425 if (type == AVMEDIA_TYPE_AUDIO) {
426 int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
429 if (is_dvr_ms_audio) {
430 // codec_id and codec_tag are unreliable in dvr_ms
431 // files. Set them later by probing stream.
432 st->codec->codec_id = AV_CODEC_ID_PROBE;
433 st->codec->codec_tag = 0;
435 if (st->codec->codec_id == AV_CODEC_ID_AAC)
436 st->need_parsing = AVSTREAM_PARSE_NONE;
438 st->need_parsing = AVSTREAM_PARSE_FULL;
439 /* We have to init the frame size at some point .... */
440 pos2 = avio_tell(pb);
441 if (size >= (pos2 + 8 - pos1 + 24)) {
442 asf_st->ds_span = avio_r8(pb);
443 asf_st->ds_packet_size = avio_rl16(pb);
444 asf_st->ds_chunk_size = avio_rl16(pb);
445 avio_rl16(pb); // ds_data_size
446 avio_r8(pb); // ds_silence_data
448 if (asf_st->ds_span > 1) {
449 if (!asf_st->ds_chunk_size ||
450 (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
451 asf_st->ds_packet_size % asf_st->ds_chunk_size)
452 asf_st->ds_span = 0; // disable descrambling
454 } else if (type == AVMEDIA_TYPE_VIDEO &&
455 size - (avio_tell(pb) - pos1 + 24) >= 51) {
459 avio_rl16(pb); /* size */
460 sizeX = avio_rl32(pb); /* size */
461 st->codec->width = avio_rl32(pb);
462 st->codec->height = avio_rl32(pb);
463 /* not available for asf */
464 avio_rl16(pb); /* panes */
465 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
466 tag1 = avio_rl32(pb);
469 st->codec->extradata_size = sizeX - 40;
470 st->codec->extradata = av_mallocz(st->codec->extradata_size +
471 FF_INPUT_BUFFER_PADDING_SIZE);
472 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
475 /* Extract palette from extradata if bpp <= 8 */
476 /* This code assumes that extradata contains only palette */
477 /* This is true for all paletted codecs implemented in libavcodec */
478 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
481 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
482 asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
484 memcpy(asf_st->palette, st->codec->extradata,
485 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
487 asf_st->palette_changed = 1;
490 st->codec->codec_tag = tag1;
491 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
492 if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
493 st->need_parsing = AVSTREAM_PARSE_FULL;
494 /* issue658 contains wrong w/h and MS even puts a fake seq header
495 * with wrong w/h in extradata while a correct one is in the stream.
496 * maximum lameness */
498 st->codec->height = 0;
499 av_freep(&st->codec->extradata);
500 st->codec->extradata_size = 0;
502 if (st->codec->codec_id == AV_CODEC_ID_H264)
503 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
505 pos2 = avio_tell(pb);
506 avio_skip(pb, size - (pos2 - pos1 + 24));
511 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
513 ASFContext *asf = s->priv_data;
514 AVIOContext *pb = s->pb;
516 int ext_len, payload_ext_ct, stream_ct, i;
517 uint32_t leak_rate, stream_num;
518 unsigned int stream_languageid_index;
520 avio_rl64(pb); // starttime
521 avio_rl64(pb); // endtime
522 leak_rate = avio_rl32(pb); // leak-datarate
523 avio_rl32(pb); // bucket-datasize
524 avio_rl32(pb); // init-bucket-fullness
525 avio_rl32(pb); // alt-leak-datarate
526 avio_rl32(pb); // alt-bucket-datasize
527 avio_rl32(pb); // alt-init-bucket-fullness
528 avio_rl32(pb); // max-object-size
529 avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
530 stream_num = avio_rl16(pb); // stream-num
532 stream_languageid_index = avio_rl16(pb); // stream-language-id-index
533 if (stream_num < 128)
534 asf->streams[stream_num].stream_language_index = stream_languageid_index;
536 avio_rl64(pb); // avg frametime in 100ns units
537 stream_ct = avio_rl16(pb); // stream-name-count
538 payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
540 if (stream_num < 128)
541 asf->stream_bitrates[stream_num] = leak_rate;
543 for (i = 0; i < stream_ct; i++) {
545 ext_len = avio_rl16(pb);
546 avio_skip(pb, ext_len);
549 for (i = 0; i < payload_ext_ct; i++) {
552 ext_len = avio_rl32(pb);
553 avio_skip(pb, ext_len);
559 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
561 AVIOContext *pb = s->pb;
562 int len1, len2, len3, len4, len5;
564 len1 = avio_rl16(pb);
565 len2 = avio_rl16(pb);
566 len3 = avio_rl16(pb);
567 len4 = avio_rl16(pb);
568 len5 = avio_rl16(pb);
569 get_tag(s, "title", 0, len1, 32);
570 get_tag(s, "author", 0, len2, 32);
571 get_tag(s, "copyright", 0, len3, 32);
572 get_tag(s, "comment", 0, len4, 32);
578 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
580 AVIOContext *pb = s->pb;
581 ASFContext *asf = s->priv_data;
582 int desc_count, i, ret;
584 desc_count = avio_rl16(pb);
585 for (i = 0; i < desc_count; i++) {
586 int name_len, value_type, value_len;
589 name_len = avio_rl16(pb);
590 if (name_len % 2) // must be even, broken lavf versions wrote len-1
592 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
593 avio_skip(pb, name_len - ret);
594 value_type = avio_rl16(pb);
595 value_len = avio_rl16(pb);
596 if (!value_type && value_len % 2)
598 /* My sample has that stream set to 0 maybe that mean the container.
599 * ASF stream count starts at 1. I am using 0 to the container value
600 * since it's unused. */
601 if (!strcmp(name, "AspectRatioX"))
602 asf->dar[0].num = get_value(s->pb, value_type, 32);
603 else if (!strcmp(name, "AspectRatioY"))
604 asf->dar[0].den = get_value(s->pb, value_type, 32);
606 get_tag(s, name, value_type, value_len, 32);
612 static int asf_read_language_list(AVFormatContext *s, int64_t size)
614 AVIOContext *pb = s->pb;
615 ASFContext *asf = s->priv_data;
617 int stream_count = avio_rl16(pb);
618 for (j = 0; j < stream_count; j++) {
620 unsigned int lang_len = avio_r8(pb);
621 if ((ret = avio_get_str16le(pb, lang_len, lang,
622 sizeof(lang))) < lang_len)
623 avio_skip(pb, lang_len - ret);
625 av_strlcpy(asf->stream_languages[j], lang,
626 sizeof(*asf->stream_languages));
632 static int asf_read_metadata(AVFormatContext *s, int64_t size)
634 AVIOContext *pb = s->pb;
635 ASFContext *asf = s->priv_data;
636 int n, stream_num, name_len, value_len;
640 for (i = 0; i < n; i++) {
644 avio_rl16(pb); // lang_list_index
645 stream_num = avio_rl16(pb);
646 name_len = avio_rl16(pb);
647 value_type = avio_rl16(pb); /* value_type */
648 value_len = avio_rl32(pb);
650 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
651 avio_skip(pb, name_len - ret);
652 av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
653 i, stream_num, name_len, value_type, value_len, name);
655 if (!strcmp(name, "AspectRatioX")){
656 int aspect_x = get_value(s->pb, value_type, 16);
658 asf->dar[stream_num].num = aspect_x;
659 } else if(!strcmp(name, "AspectRatioY")){
660 int aspect_y = get_value(s->pb, value_type, 16);
662 asf->dar[stream_num].den = aspect_y;
664 get_tag(s, name, value_type, value_len, 16);
671 static int asf_read_marker(AVFormatContext *s, int64_t size)
673 AVIOContext *pb = s->pb;
674 int i, count, name_len, ret;
677 avio_rl64(pb); // reserved 16 bytes
678 avio_rl64(pb); // ...
679 count = avio_rl32(pb); // markers count
680 avio_rl16(pb); // reserved 2 bytes
681 name_len = avio_rl16(pb); // name length
682 for (i = 0; i < name_len; i++)
683 avio_r8(pb); // skip the name
685 for (i = 0; i < count; i++) {
689 avio_rl64(pb); // offset, 8 bytes
690 pres_time = avio_rl64(pb); // presentation time
691 avio_rl16(pb); // entry length
692 avio_rl32(pb); // send time
693 avio_rl32(pb); // flags
694 name_len = avio_rl32(pb); // name length
695 if ((ret = avio_get_str16le(pb, name_len * 2, name,
696 sizeof(name))) < name_len)
697 avio_skip(pb, name_len - ret);
698 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
699 AV_NOPTS_VALUE, name);
705 static int asf_read_header(AVFormatContext *s)
707 ASFContext *asf = s->priv_data;
709 AVIOContext *pb = s->pb;
714 if (ff_guidcmp(&g, &ff_asf_header))
720 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
722 uint64_t gpos = avio_tell(pb);
724 gsize = avio_rl64(pb);
726 if (!ff_guidcmp(&g, &ff_asf_data_header)) {
727 asf->data_object_offset = avio_tell(pb);
728 /* If not streaming, gsize is not unlimited (how?),
729 * and there is enough space in the file.. */
730 if (!(asf->hdr.flags & 0x01) && gsize >= 100)
731 asf->data_object_size = gsize - 24;
733 asf->data_object_size = (uint64_t)-1;
738 if (!ff_guidcmp(&g, &ff_asf_file_header)) {
739 int ret = asf_read_file_properties(s, gsize);
742 } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
743 asf_read_stream_properties(s, gsize);
744 } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
745 asf_read_content_desc(s, gsize);
746 } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
747 asf_read_language_list(s, gsize);
748 } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
749 asf_read_ext_content_desc(s, gsize);
750 } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
751 asf_read_metadata(s, gsize);
752 } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
753 asf_read_metadata(s, gsize);
754 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
755 asf_read_ext_stream_properties(s, gsize);
757 // there could be a optional stream properties object to follow
758 // if so the next iteration will pick it up
760 } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
764 } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
765 asf_read_marker(s, gsize);
766 } else if (pb->eof_reached) {
770 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
771 av_log(s, AV_LOG_WARNING,
772 "DRM protected stream detected, decoding will likely fail!\n");
773 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
774 av_log(s, AV_LOG_WARNING,
775 "Ext DRM protected stream detected, decoding will likely fail!\n");
776 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
777 av_log(s, AV_LOG_WARNING,
778 "Digital signature detected, decoding will likely fail!\n");
782 if (avio_tell(pb) != gpos + gsize)
783 av_log(s, AV_LOG_DEBUG,
784 "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
785 avio_tell(pb) - gpos, gsize);
786 avio_seek(pb, gpos + gsize, SEEK_SET);
794 asf->data_offset = avio_tell(pb);
795 asf->packet_size_left = 0;
797 for (i = 0; i < 128; i++) {
798 int stream_num = asf->asfid2avid[i];
799 if (stream_num >= 0) {
800 AVStream *st = s->streams[stream_num];
801 if (!st->codec->bit_rate)
802 st->codec->bit_rate = asf->stream_bitrates[i];
803 if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
804 av_reduce(&st->sample_aspect_ratio.num,
805 &st->sample_aspect_ratio.den,
806 asf->dar[i].num, asf->dar[i].den, INT_MAX);
807 } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
808 // Use ASF container value if the stream doesn't set AR.
809 (st->codec->codec_type == AVMEDIA_TYPE_VIDEO))
810 av_reduce(&st->sample_aspect_ratio.num,
811 &st->sample_aspect_ratio.den,
812 asf->dar[0].num, asf->dar[0].den, INT_MAX);
814 av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
815 i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
816 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
818 // copy and convert language codes to the frontend
819 if (asf->streams[i].stream_language_index < 128) {
820 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
821 if (rfc1766 && strlen(rfc1766) > 1) {
822 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
823 const char *iso6392 = av_convert_lang_to(primary_tag,
824 AV_LANG_ISO639_2_BIBL);
826 av_dict_set(&st->metadata, "language", iso6392, 0);
832 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
837 #define DO_2BITS(bits, var, defval) \
838 switch (bits & 3) { \
840 var = avio_rl32(pb); \
844 var = avio_rl16(pb); \
857 * Load a single ASF packet into the demuxer.
858 * @param s demux context
859 * @param pb context to read data from
860 * @return 0 on success, <0 on error
862 static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
864 ASFContext *asf = s->priv_data;
865 uint32_t packet_length, padsize;
869 // if we do not know packet size, allow skipping up to 32 kB
871 if (asf->no_resync_search)
873 else if (s->packet_size > 0)
874 off = (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
881 if (c == 0x82 && !d && !e)
886 /* This code allows handling of -EAGAIN at packet boundaries (i.e.
887 * if the packet sync code above triggers -EAGAIN). This does not
888 * imply complete -EAGAIN handling support at random positions in
890 if (pb->error == AVERROR(EAGAIN))
891 return AVERROR(EAGAIN);
892 if (!pb->eof_reached)
893 av_log(s, AV_LOG_ERROR,
894 "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
896 if ((c & 0x8f) == 0x82) {
898 if (!pb->eof_reached)
899 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
905 } else if (!pb->eof_reached) {
906 avio_seek(pb, -1, SEEK_CUR); // FIXME
909 asf->packet_flags = c;
910 asf->packet_property = d;
912 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
913 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
914 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
916 // the following checks prevent overflows and infinite loops
917 if (!packet_length || packet_length >= (1U << 29)) {
918 av_log(s, AV_LOG_ERROR,
919 "invalid packet_length %d at:%"PRId64"\n",
920 packet_length, avio_tell(pb));
923 if (padsize >= packet_length) {
924 av_log(s, AV_LOG_ERROR,
925 "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
929 asf->packet_timestamp = avio_rl32(pb);
930 avio_rl16(pb); /* duration */
931 // rsize has at least 11 bytes which have to be present
933 if (asf->packet_flags & 0x01) {
934 asf->packet_segsizetype = avio_r8(pb);
936 asf->packet_segments = asf->packet_segsizetype & 0x3f;
938 asf->packet_segments = 1;
939 asf->packet_segsizetype = 0x80;
941 if (rsize > packet_length - padsize) {
942 asf->packet_size_left = 0;
943 av_log(s, AV_LOG_ERROR,
944 "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
945 rsize, packet_length, padsize, avio_tell(pb));
948 asf->packet_size_left = packet_length - padsize - rsize;
949 if (packet_length < asf->hdr.min_pktsize)
950 padsize += asf->hdr.min_pktsize - packet_length;
951 asf->packet_padsize = padsize;
952 av_dlog(s, "packet: size=%d padsize=%d left=%d\n",
953 s->packet_size, asf->packet_padsize, asf->packet_size_left);
959 * @return <0 if error
961 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
963 ASFContext *asf = s->priv_data;
965 int num = avio_r8(pb);
968 asf->packet_segments--;
969 asf->packet_key_frame = num >> 7;
970 asf->stream_index = asf->asfid2avid[num & 0x7f];
971 // sequence should be ignored!
972 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
973 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
974 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
975 av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
976 asf->packet_key_frame, asf->stream_index, asf->packet_seq,
977 asf->packet_frag_offset, asf->packet_replic_size);
978 if (asf->packet_replic_size >= 8) {
979 asf->packet_obj_size = avio_rl32(pb);
980 if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) {
981 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
984 asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
985 if (asf->packet_replic_size >= 8 + 38 + 4) {
991 avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
993 asf->packet_frag_timestamp = ts0 / 10000;
995 asf->packet_frag_timestamp = AV_NOPTS_VALUE;
997 avio_skip(pb, asf->packet_replic_size - 8);
998 rsize += asf->packet_replic_size; // FIXME - check validity
999 } else if (asf->packet_replic_size == 1) {
1000 // multipacket - frag_offset is beginning timestamp
1001 asf->packet_time_start = asf->packet_frag_offset;
1002 asf->packet_frag_offset = 0;
1003 asf->packet_frag_timestamp = asf->packet_timestamp;
1005 asf->packet_time_delta = avio_r8(pb);
1007 } else if (asf->packet_replic_size != 0) {
1008 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1009 asf->packet_replic_size);
1012 if (asf->packet_flags & 0x01) {
1013 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1014 if (rsize > asf->packet_size_left) {
1015 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1017 } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1018 if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1019 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
1020 asf->packet_size_left, rsize);
1023 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1024 asf->packet_size_left += diff;
1025 asf->packet_padsize -= diff;
1029 if (rsize > asf->packet_size_left) {
1030 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1033 asf->packet_frag_size = asf->packet_size_left - rsize;
1035 if (asf->packet_replic_size == 1) {
1036 asf->packet_multi_size = asf->packet_frag_size;
1037 if (asf->packet_multi_size > asf->packet_size_left)
1040 asf->packet_size_left -= rsize;
1046 * Parse data from individual ASF packets (which were previously loaded
1047 * with asf_get_packet()).
1048 * @param s demux context
1049 * @param pb context to read data from
1050 * @param pkt pointer to store packet data into
1051 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
1052 * packets need to be loaded (through asf_get_packet())
1054 static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1056 ASFContext *asf = s->priv_data;
1057 ASFStream *asf_st = 0;
1061 if (pb->eof_reached)
1064 if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1065 asf->packet_segments < 1) {
1066 int ret = asf->packet_size_left + asf->packet_padsize;
1072 asf->packet_pos = avio_tell(pb);
1073 if (asf->data_object_size != (uint64_t)-1 &&
1074 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1075 return AVERROR_EOF; /* Do not exceed the size of the data object */
1078 if (asf->packet_time_start == 0) {
1079 if (asf_read_frame_header(s, pb) < 0) {
1080 asf->packet_segments = 0;
1083 if (asf->stream_index < 0 ||
1084 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1085 (!asf->packet_key_frame &&
1086 s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
1087 asf->packet_time_start = 0;
1088 /* unhandled packet (should not happen) */
1089 avio_skip(pb, asf->packet_frag_size);
1090 asf->packet_size_left -= asf->packet_frag_size;
1091 if (asf->stream_index < 0)
1092 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1093 asf->packet_frag_size);
1096 asf->asf_st = s->streams[asf->stream_index]->priv_data;
1098 asf_st = asf->asf_st;
1101 if (asf->packet_replic_size == 1) {
1102 // frag_offset is here used as the beginning timestamp
1103 asf->packet_frag_timestamp = asf->packet_time_start;
1104 asf->packet_time_start += asf->packet_time_delta;
1105 asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1106 asf->packet_size_left--;
1107 asf->packet_multi_size--;
1108 if (asf->packet_multi_size < asf->packet_obj_size) {
1109 asf->packet_time_start = 0;
1110 avio_skip(pb, asf->packet_multi_size);
1111 asf->packet_size_left -= asf->packet_multi_size;
1114 asf->packet_multi_size -= asf->packet_obj_size;
1116 if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
1117 asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
1118 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
1119 asf_st->frag_offset, asf->packet_frag_size,
1120 asf->packet_obj_size, asf_st->pkt.size);
1121 asf->packet_obj_size = asf_st->pkt.size;
1124 if (asf_st->pkt.size != asf->packet_obj_size ||
1125 // FIXME is this condition sufficient?
1126 asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1127 if (asf_st->pkt.data) {
1128 av_log(s, AV_LOG_INFO,
1129 "freeing incomplete packet size %d, new %d\n",
1130 asf_st->pkt.size, asf->packet_obj_size);
1131 asf_st->frag_offset = 0;
1132 av_free_packet(&asf_st->pkt);
1135 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
1136 asf_st->seq = asf->packet_seq;
1137 asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1138 asf_st->pkt.stream_index = asf->stream_index;
1139 asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1141 if (asf_st->pkt.data && asf_st->palette_changed) {
1143 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
1146 av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1148 memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1149 asf_st->palette_changed = 0;
1152 av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1153 asf->stream_index, asf->packet_key_frame,
1154 asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1155 s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
1156 asf->packet_obj_size);
1157 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
1158 asf->packet_key_frame = 1;
1159 if (asf->packet_key_frame)
1160 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1164 av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1165 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1166 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1167 asf->packet_size_left -= asf->packet_frag_size;
1168 if (asf->packet_size_left < 0)
1171 if (asf->packet_frag_offset >= asf_st->pkt.size ||
1172 asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1173 av_log(s, AV_LOG_ERROR,
1174 "packet fragment position invalid %u,%u not in %u\n",
1175 asf->packet_frag_offset, asf->packet_frag_size,
1180 ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1181 asf->packet_frag_size);
1182 if (ret != asf->packet_frag_size) {
1183 if (ret < 0 || asf->packet_frag_offset + ret == 0)
1184 return ret < 0 ? ret : AVERROR_EOF;
1186 if (asf_st->ds_span > 1) {
1187 // scrambling, we can either drop it completely or fill the remainder
1188 // TODO: should we fill the whole packet instead of just the current
1190 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1191 asf->packet_frag_size - ret);
1192 ret = asf->packet_frag_size;
1194 // no scrambling, so we can return partial packets
1195 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1198 if (s->key && s->keylen == 20)
1199 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1201 asf_st->frag_offset += ret;
1202 /* test if whole packet is read */
1203 if (asf_st->frag_offset == asf_st->pkt.size) {
1204 // workaround for macroshit radio DVR-MS files
1205 if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
1206 asf_st->pkt.size > 100) {
1208 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1210 if (i == asf_st->pkt.size) {
1211 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1212 asf_st->frag_offset = 0;
1213 av_free_packet(&asf_st->pkt);
1219 if (asf_st->ds_span > 1) {
1220 if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1221 av_log(s, AV_LOG_ERROR,
1222 "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1223 asf_st->pkt.size, asf_st->ds_packet_size,
1226 /* packet descrambling */
1227 AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
1228 FF_INPUT_BUFFER_PADDING_SIZE);
1230 uint8_t *newdata = buf->data;
1232 memset(newdata + asf_st->pkt.size, 0,
1233 FF_INPUT_BUFFER_PADDING_SIZE);
1234 while (offset < asf_st->pkt.size) {
1235 int off = offset / asf_st->ds_chunk_size;
1236 int row = off / asf_st->ds_span;
1237 int col = off % asf_st->ds_span;
1238 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1239 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1240 assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1241 memcpy(newdata + offset,
1242 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1243 asf_st->ds_chunk_size);
1244 offset += asf_st->ds_chunk_size;
1246 av_buffer_unref(&asf_st->pkt.buf);
1247 asf_st->pkt.buf = buf;
1248 asf_st->pkt.data = buf->data;
1252 asf_st->frag_offset = 0;
1254 #if FF_API_DESTRUCT_PACKET
1255 asf_st->pkt.destruct = NULL;
1257 asf_st->pkt.buf = 0;
1258 asf_st->pkt.size = 0;
1259 asf_st->pkt.data = 0;
1260 asf_st->pkt.side_data_elems = 0;
1261 asf_st->pkt.side_data = NULL;
1262 break; // packet completed
1268 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1270 ASFContext *asf = s->priv_data;
1275 /* parse cached packets, if any */
1276 if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
1278 if ((ret = asf_get_packet(s, s->pb)) < 0)
1279 assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1280 asf->packet_segments < 1);
1281 asf->packet_time_start = 0;
1285 // Added to support seeking after packets have been read
1286 // If information is not reset, read_packet fails due to
1287 // leftover information from previous reads
1288 static void asf_reset_header(AVFormatContext *s)
1290 ASFContext *asf = s->priv_data;
1294 asf->packet_size_left = 0;
1295 asf->packet_segments = 0;
1296 asf->packet_flags = 0;
1297 asf->packet_property = 0;
1298 asf->packet_timestamp = 0;
1299 asf->packet_segsizetype = 0;
1300 asf->packet_segments = 0;
1301 asf->packet_seq = 0;
1302 asf->packet_replic_size = 0;
1303 asf->packet_key_frame = 0;
1304 asf->packet_padsize = 0;
1305 asf->packet_frag_offset = 0;
1306 asf->packet_frag_size = 0;
1307 asf->packet_frag_timestamp = 0;
1308 asf->packet_multi_size = 0;
1309 asf->packet_obj_size = 0;
1310 asf->packet_time_delta = 0;
1311 asf->packet_time_start = 0;
1313 for (i = 0; i < s->nb_streams; i++) {
1314 asf_st = s->streams[i]->priv_data;
1317 av_free_packet(&asf_st->pkt);
1318 asf_st->frag_offset = 0;
1324 static int asf_read_close(AVFormatContext *s)
1326 asf_reset_header(s);
1331 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1332 int64_t *ppos, int64_t pos_limit)
1334 AVPacket pkt1, *pkt = &pkt1;
1337 int64_t pos = *ppos;
1339 int64_t start_pos[ASF_MAX_STREAMS];
1341 for (i = 0; i < s->nb_streams; i++)
1344 if (s->packet_size > 0)
1345 pos = (pos + s->packet_size - 1 - s->data_offset) /
1346 s->packet_size * s->packet_size +
1349 avio_seek(s->pb, pos, SEEK_SET);
1351 asf_reset_header(s);
1353 if (asf_read_packet(s, pkt) < 0) {
1354 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1355 return AV_NOPTS_VALUE;
1360 av_free_packet(pkt);
1361 if (pkt->flags & AV_PKT_FLAG_KEY) {
1362 i = pkt->stream_index;
1364 asf_st = s->streams[i]->priv_data;
1367 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1368 pos = asf_st->packet_pos;
1370 av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1371 pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1372 start_pos[i] = asf_st->packet_pos + 1;
1374 if (pkt->stream_index == stream_index)
1383 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1386 ASFContext *asf = s->priv_data;
1387 int64_t current_pos = avio_tell(s->pb);
1390 avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1391 ff_get_guid(s->pb, &g);
1393 /* the data object can be followed by other top-level objects,
1394 * skip them until the simple index object is reached */
1395 while (ff_guidcmp(&g, &index_guid)) {
1396 int64_t gsize = avio_rl64(s->pb);
1397 if (gsize < 24 || s->pb->eof_reached) {
1398 avio_seek(s->pb, current_pos, SEEK_SET);
1401 avio_skip(s->pb, gsize - 24);
1402 ff_get_guid(s->pb, &g);
1406 int64_t itime, last_pos = -1;
1408 int64_t av_unused gsize = avio_rl64(s->pb);
1409 ff_get_guid(s->pb, &g);
1410 itime = avio_rl64(s->pb);
1411 pct = avio_rl32(s->pb);
1412 ict = avio_rl32(s->pb);
1413 av_log(s, AV_LOG_DEBUG,
1414 "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1416 for (i = 0; i < ict; i++) {
1417 int pktnum = avio_rl32(s->pb);
1418 int pktct = avio_rl16(s->pb);
1419 int64_t pos = s->data_offset + s->packet_size * (int64_t)pktnum;
1420 int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1422 if (pos != last_pos) {
1423 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1424 pktnum, pktct, index_pts);
1425 av_add_index_entry(s->streams[stream_index], pos, index_pts,
1426 s->packet_size, 0, AVINDEX_KEYFRAME);
1430 asf->index_read = ict > 0;
1432 avio_seek(s->pb, current_pos, SEEK_SET);
1435 static int asf_read_seek(AVFormatContext *s, int stream_index,
1436 int64_t pts, int flags)
1438 ASFContext *asf = s->priv_data;
1439 AVStream *st = s->streams[stream_index];
1443 if (s->packet_size <= 0)
1446 /* Try using the protocol's read_seek if available */
1448 int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1450 asf_reset_header(s);
1451 if (ret != AVERROR(ENOSYS))
1455 if (!asf->index_read)
1456 asf_build_simple_index(s, stream_index);
1458 if ((asf->index_read && st->index_entries)) {
1459 index = av_index_search_timestamp(st, pts, flags);
1461 /* find the position */
1462 pos = st->index_entries[index].pos;
1465 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1466 avio_seek(s->pb, pos, SEEK_SET);
1467 asf_reset_header(s);
1471 /* no index or seeking by index failed */
1472 if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1474 asf_reset_header(s);
1478 AVInputFormat ff_asf_demuxer = {
1480 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1481 .priv_data_size = sizeof(ASFContext),
1482 .read_probe = asf_probe,
1483 .read_header = asf_read_header,
1484 .read_packet = asf_read_packet,
1485 .read_close = asf_read_close,
1486 .read_seek = asf_read_seek,
1487 .read_timestamp = asf_read_pts,
1488 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1489 .priv_class = &asf_class,