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
24 #include "libavutil/attributes.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/common.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
34 #include "avio_internal.h"
35 #include "avlanguage.h"
42 typedef struct ASFContext {
44 int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
45 ASFStream streams[128]; ///< it's max number and it's not that big
46 uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
48 char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US)
49 /* non streamed additonnal info */
52 /* only for reading */
53 uint64_t data_offset; ///< beginning of the first data packet
54 uint64_t data_object_offset; ///< data object offset (excl. GUID & size)
55 uint64_t data_object_size; ///< size of the data object
63 int packet_segsizetype;
66 int packet_replic_size;
69 unsigned int packet_frag_offset;
70 unsigned int packet_frag_size;
71 int64_t packet_frag_timestamp;
72 int packet_multi_size;
74 int packet_time_delta;
75 int packet_time_start;
80 ASFStream *asf_st; ///< currently decoded stream
86 static const AVOption options[] = {
87 { "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 },
88 { "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
92 static const AVClass asf_class = {
93 .class_name = "asf demuxer",
94 .item_name = av_default_item_name,
96 .version = LIBAVUTIL_VERSION_INT,
102 #define ASF_MAX_STREAMS 127
103 #define FRAME_HEADER_SIZE 17
104 // Fix Me! FRAME_HEADER_SIZE may be different.
106 static const ff_asf_guid index_guid = {
107 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
111 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
112 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
115 #define PRINT_IF_GUID(g, cmp) \
116 if (!ff_guidcmp(g, &cmp)) \
117 av_dlog(NULL, "(GUID: %s) ", # cmp)
119 static void print_guid(ff_asf_guid *g)
122 PRINT_IF_GUID(g, ff_asf_header);
123 else PRINT_IF_GUID(g, ff_asf_file_header);
124 else PRINT_IF_GUID(g, ff_asf_stream_header);
125 else PRINT_IF_GUID(g, ff_asf_audio_stream);
126 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
127 else PRINT_IF_GUID(g, ff_asf_video_stream);
128 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
129 else PRINT_IF_GUID(g, ff_asf_command_stream);
130 else PRINT_IF_GUID(g, ff_asf_comment_header);
131 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
132 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
133 else PRINT_IF_GUID(g, ff_asf_data_header);
134 else PRINT_IF_GUID(g, index_guid);
135 else PRINT_IF_GUID(g, ff_asf_head1_guid);
136 else PRINT_IF_GUID(g, ff_asf_head2_guid);
137 else PRINT_IF_GUID(g, ff_asf_my_guid);
138 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
139 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
140 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
141 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
142 else PRINT_IF_GUID(g, ff_asf_metadata_header);
143 else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
144 else PRINT_IF_GUID(g, ff_asf_marker_header);
145 else PRINT_IF_GUID(g, stream_bitrate_guid);
146 else PRINT_IF_GUID(g, ff_asf_language_guid);
148 av_dlog(NULL, "(GUID: unknown) ");
149 for (i = 0; i < 16; i++)
150 av_dlog(NULL, " 0x%02x,", (*g)[i]);
151 av_dlog(NULL, "}\n");
155 #define print_guid(g)
158 static int asf_probe(AVProbeData *pd)
160 /* check file header */
161 if (!ff_guidcmp(pd->buf, &ff_asf_header))
162 return AVPROBE_SCORE_MAX;
167 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
168 * but 16 bit for "Metadata Object" and "Metadata Library Object" */
169 static int get_value(AVIOContext *pb, int type, int type2_size)
173 return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
175 return avio_rl32(pb);
177 return avio_rl64(pb);
179 return avio_rl16(pb);
185 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
186 * but in reality this is only loosely similar */
187 static int asf_read_picture(AVFormatContext *s, int len)
189 AVPacket pkt = { 0 };
190 const CodecMime *mime = ff_id3v2_mime_tags;
191 enum AVCodecID id = AV_CODEC_ID_NONE;
193 uint8_t *desc = NULL;
195 int ret, type, picsize, desc_len;
197 /* type + picsize + mime + desc */
198 if (len < 1 + 4 + 2 + 2) {
199 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
200 return AVERROR_INVALIDDATA;
204 type = avio_r8(s->pb);
206 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
207 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
211 /* picture data size */
212 picsize = avio_rl32(s->pb);
215 /* picture MIME type */
216 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
217 while (mime->id != AV_CODEC_ID_NONE) {
218 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
224 if (id == AV_CODEC_ID_NONE) {
225 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
230 if (picsize >= len) {
231 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
233 return AVERROR_INVALIDDATA;
236 /* picture description */
237 desc_len = (len - picsize) * 2 + 1;
238 desc = av_malloc(desc_len);
240 return AVERROR(ENOMEM);
241 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
243 ret = av_get_packet(s->pb, &pkt, picsize);
247 st = avformat_new_stream(s, NULL);
249 ret = AVERROR(ENOMEM);
252 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
253 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
254 st->codec->codec_id = id;
255 st->attached_pic = pkt;
256 st->attached_pic.stream_index = st->index;
257 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
260 av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
264 av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
270 av_free_packet(&pkt);
274 static void get_id3_tag(AVFormatContext *s, int len)
276 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
278 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
279 if (id3v2_extra_meta)
280 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
281 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
284 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
286 ASFContext *asf = s->priv_data;
288 int64_t off = avio_tell(s->pb);
290 if ((unsigned)len >= (UINT_MAX - 1) / 2)
293 if (!asf->export_xmp && !strncmp(key, "xmp", 3))
296 value = av_malloc(2 * len + 1);
300 if (type == 0) { // UTF16-LE
301 avio_get_str16le(s->pb, len, value, 2 * len + 1);
302 } else if (type == 1) { // byte array
303 if (!strcmp(key, "WM/Picture")) { // handle cover art
304 asf_read_picture(s, len);
305 } else if (!strcmp(key, "ID3")) { // handle ID3 tag
308 av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
311 } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
312 uint64_t num = get_value(s->pb, type, type2_size);
313 snprintf(value, len, "%"PRIu64, num);
314 } else if (type == 6) { // (don't) handle GUID
315 av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
318 av_log(s, AV_LOG_DEBUG,
319 "Unsupported value type %d in tag %s.\n", type, key);
323 av_dict_set(&s->metadata, key, value, 0);
327 avio_seek(s->pb, off + len, SEEK_SET);
330 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
332 ASFContext *asf = s->priv_data;
333 AVIOContext *pb = s->pb;
335 ff_get_guid(pb, &asf->hdr.guid);
336 asf->hdr.file_size = avio_rl64(pb);
337 asf->hdr.create_time = avio_rl64(pb);
338 avio_rl64(pb); /* number of packets */
339 asf->hdr.play_time = avio_rl64(pb);
340 asf->hdr.send_time = avio_rl64(pb);
341 asf->hdr.preroll = avio_rl32(pb);
342 asf->hdr.ignore = avio_rl32(pb);
343 asf->hdr.flags = avio_rl32(pb);
344 asf->hdr.min_pktsize = avio_rl32(pb);
345 asf->hdr.max_pktsize = avio_rl32(pb);
346 if (asf->hdr.min_pktsize >= (1U << 29))
347 return AVERROR_INVALIDDATA;
348 asf->hdr.max_bitrate = avio_rl32(pb);
349 s->packet_size = asf->hdr.max_pktsize;
354 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
356 ASFContext *asf = s->priv_data;
357 AVIOContext *pb = s->pb;
361 enum AVMediaType type;
362 int type_specific_size, sizeX;
364 int64_t pos1, pos2, start_time;
365 int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
367 if (s->nb_streams == ASF_MAX_STREAMS) {
368 av_log(s, AV_LOG_ERROR, "too many streams\n");
369 return AVERROR(EINVAL);
372 pos1 = avio_tell(pb);
374 st = avformat_new_stream(s, NULL);
376 return AVERROR(ENOMEM);
377 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
378 asf_st = av_mallocz(sizeof(ASFStream));
380 return AVERROR(ENOMEM);
381 st->priv_data = asf_st;
383 start_time = asf->hdr.preroll;
385 asf_st->stream_language_index = 128; // invalid stream index means no language info
387 if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
388 st->duration = asf->hdr.play_time /
389 (10000000 / 1000) - start_time;
393 test_for_ext_stream_audio = 0;
394 if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
395 type = AVMEDIA_TYPE_AUDIO;
396 } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
397 type = AVMEDIA_TYPE_VIDEO;
398 } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
399 type = AVMEDIA_TYPE_VIDEO;
400 st->codec->codec_id = AV_CODEC_ID_MJPEG;
401 } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
402 type = AVMEDIA_TYPE_DATA;
403 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
404 test_for_ext_stream_audio = 1;
405 type = AVMEDIA_TYPE_UNKNOWN;
410 avio_skip(pb, 8); /* total_size */
411 type_specific_size = avio_rl32(pb);
413 st->id = avio_rl16(pb) & 0x7f; /* stream id */
414 // mapping of asf ID to AV stream ID;
415 asf->asfid2avid[st->id] = s->nb_streams - 1;
419 if (test_for_ext_stream_audio) {
421 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
422 type = AVMEDIA_TYPE_AUDIO;
433 st->codec->codec_type = type;
434 if (type == AVMEDIA_TYPE_AUDIO) {
435 int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
438 if (is_dvr_ms_audio) {
439 // codec_id and codec_tag are unreliable in dvr_ms
440 // files. Set them later by probing stream.
441 st->codec->codec_id = AV_CODEC_ID_PROBE;
442 st->codec->codec_tag = 0;
444 if (st->codec->codec_id == AV_CODEC_ID_AAC)
445 st->need_parsing = AVSTREAM_PARSE_NONE;
447 st->need_parsing = AVSTREAM_PARSE_FULL;
448 /* We have to init the frame size at some point .... */
449 pos2 = avio_tell(pb);
450 if (size >= (pos2 + 8 - pos1 + 24)) {
451 asf_st->ds_span = avio_r8(pb);
452 asf_st->ds_packet_size = avio_rl16(pb);
453 asf_st->ds_chunk_size = avio_rl16(pb);
454 avio_rl16(pb); // ds_data_size
455 avio_r8(pb); // ds_silence_data
457 if (asf_st->ds_span > 1) {
458 if (!asf_st->ds_chunk_size ||
459 (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
460 asf_st->ds_packet_size % asf_st->ds_chunk_size)
461 asf_st->ds_span = 0; // disable descrambling
463 } else if (type == AVMEDIA_TYPE_VIDEO &&
464 size - (avio_tell(pb) - pos1 + 24) >= 51) {
468 avio_rl16(pb); /* size */
469 sizeX = avio_rl32(pb); /* size */
470 st->codec->width = avio_rl32(pb);
471 st->codec->height = avio_rl32(pb);
472 /* not available for asf */
473 avio_rl16(pb); /* panes */
474 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
475 tag1 = avio_rl32(pb);
478 st->codec->extradata_size = sizeX - 40;
479 st->codec->extradata = av_mallocz(st->codec->extradata_size +
480 FF_INPUT_BUFFER_PADDING_SIZE);
481 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
484 /* Extract palette from extradata if bpp <= 8 */
485 /* This code assumes that extradata contains only palette */
486 /* This is true for all paletted codecs implemented in libavcodec */
487 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
490 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
491 asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
493 memcpy(asf_st->palette, st->codec->extradata,
494 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
496 asf_st->palette_changed = 1;
499 st->codec->codec_tag = tag1;
500 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
501 if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
502 st->need_parsing = AVSTREAM_PARSE_FULL;
503 /* issue658 contains wrong w/h and MS even puts a fake seq header
504 * with wrong w/h in extradata while a correct one is in the stream.
505 * maximum lameness */
507 st->codec->height = 0;
508 av_freep(&st->codec->extradata);
509 st->codec->extradata_size = 0;
511 if (st->codec->codec_id == AV_CODEC_ID_H264)
512 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
514 pos2 = avio_tell(pb);
515 avio_skip(pb, size - (pos2 - pos1 + 24));
520 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
522 ASFContext *asf = s->priv_data;
523 AVIOContext *pb = s->pb;
525 int ext_len, payload_ext_ct, stream_ct, i;
526 uint32_t leak_rate, stream_num;
527 unsigned int stream_languageid_index;
529 avio_rl64(pb); // starttime
530 avio_rl64(pb); // endtime
531 leak_rate = avio_rl32(pb); // leak-datarate
532 avio_rl32(pb); // bucket-datasize
533 avio_rl32(pb); // init-bucket-fullness
534 avio_rl32(pb); // alt-leak-datarate
535 avio_rl32(pb); // alt-bucket-datasize
536 avio_rl32(pb); // alt-init-bucket-fullness
537 avio_rl32(pb); // max-object-size
538 avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
539 stream_num = avio_rl16(pb); // stream-num
541 stream_languageid_index = avio_rl16(pb); // stream-language-id-index
542 if (stream_num < 128)
543 asf->streams[stream_num].stream_language_index = stream_languageid_index;
545 avio_rl64(pb); // avg frametime in 100ns units
546 stream_ct = avio_rl16(pb); // stream-name-count
547 payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
549 if (stream_num < 128)
550 asf->stream_bitrates[stream_num] = leak_rate;
552 for (i = 0; i < stream_ct; i++) {
554 ext_len = avio_rl16(pb);
555 avio_skip(pb, ext_len);
558 for (i = 0; i < payload_ext_ct; i++) {
561 ext_len = avio_rl32(pb);
562 avio_skip(pb, ext_len);
568 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
570 AVIOContext *pb = s->pb;
571 int len1, len2, len3, len4, len5;
573 len1 = avio_rl16(pb);
574 len2 = avio_rl16(pb);
575 len3 = avio_rl16(pb);
576 len4 = avio_rl16(pb);
577 len5 = avio_rl16(pb);
578 get_tag(s, "title", 0, len1, 32);
579 get_tag(s, "author", 0, len2, 32);
580 get_tag(s, "copyright", 0, len3, 32);
581 get_tag(s, "comment", 0, len4, 32);
587 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
589 AVIOContext *pb = s->pb;
590 ASFContext *asf = s->priv_data;
591 int desc_count, i, ret;
593 desc_count = avio_rl16(pb);
594 for (i = 0; i < desc_count; i++) {
595 int name_len, value_type, value_len;
598 name_len = avio_rl16(pb);
599 if (name_len % 2) // must be even, broken lavf versions wrote len-1
601 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
602 avio_skip(pb, name_len - ret);
603 value_type = avio_rl16(pb);
604 value_len = avio_rl16(pb);
605 if (!value_type && value_len % 2)
607 /* My sample has that stream set to 0 maybe that mean the container.
608 * ASF stream count starts at 1. I am using 0 to the container value
609 * since it's unused. */
610 if (!strcmp(name, "AspectRatioX"))
611 asf->dar[0].num = get_value(s->pb, value_type, 32);
612 else if (!strcmp(name, "AspectRatioY"))
613 asf->dar[0].den = get_value(s->pb, value_type, 32);
615 get_tag(s, name, value_type, value_len, 32);
621 static int asf_read_language_list(AVFormatContext *s, int64_t size)
623 AVIOContext *pb = s->pb;
624 ASFContext *asf = s->priv_data;
626 int stream_count = avio_rl16(pb);
627 for (j = 0; j < stream_count; j++) {
629 unsigned int lang_len = avio_r8(pb);
630 if ((ret = avio_get_str16le(pb, lang_len, lang,
631 sizeof(lang))) < lang_len)
632 avio_skip(pb, lang_len - ret);
634 av_strlcpy(asf->stream_languages[j], lang,
635 sizeof(*asf->stream_languages));
641 static int asf_read_metadata(AVFormatContext *s, int64_t size)
643 AVIOContext *pb = s->pb;
644 ASFContext *asf = s->priv_data;
645 int n, stream_num, name_len, value_len;
649 for (i = 0; i < n; i++) {
653 avio_rl16(pb); // lang_list_index
654 stream_num = avio_rl16(pb);
655 name_len = avio_rl16(pb);
656 value_type = avio_rl16(pb); /* value_type */
657 value_len = avio_rl32(pb);
659 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
660 avio_skip(pb, name_len - ret);
661 av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
662 i, stream_num, name_len, value_type, value_len, name);
664 if (!strcmp(name, "AspectRatioX")){
665 int aspect_x = get_value(s->pb, value_type, 16);
667 asf->dar[stream_num].num = aspect_x;
668 } else if(!strcmp(name, "AspectRatioY")){
669 int aspect_y = get_value(s->pb, value_type, 16);
671 asf->dar[stream_num].den = aspect_y;
673 get_tag(s, name, value_type, value_len, 16);
680 static int asf_read_marker(AVFormatContext *s, int64_t size)
682 AVIOContext *pb = s->pb;
683 ASFContext *asf = s->priv_data;
684 int i, count, name_len, ret;
687 avio_rl64(pb); // reserved 16 bytes
688 avio_rl64(pb); // ...
689 count = avio_rl32(pb); // markers count
690 avio_rl16(pb); // reserved 2 bytes
691 name_len = avio_rl16(pb); // name length
692 for (i = 0; i < name_len; i++)
693 avio_r8(pb); // skip the name
695 for (i = 0; i < count; i++) {
699 avio_rl64(pb); // offset, 8 bytes
700 pres_time = avio_rl64(pb); // presentation time
701 pres_time -= asf->hdr.preroll * 10000;
702 avio_rl16(pb); // entry length
703 avio_rl32(pb); // send time
704 avio_rl32(pb); // flags
705 name_len = avio_rl32(pb); // name length
706 if ((ret = avio_get_str16le(pb, name_len * 2, name,
707 sizeof(name))) < name_len)
708 avio_skip(pb, name_len - ret);
709 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
710 AV_NOPTS_VALUE, name);
716 static int asf_read_header(AVFormatContext *s)
718 ASFContext *asf = s->priv_data;
720 AVIOContext *pb = s->pb;
725 if (ff_guidcmp(&g, &ff_asf_header))
731 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
733 uint64_t gpos = avio_tell(pb);
735 gsize = avio_rl64(pb);
737 if (!ff_guidcmp(&g, &ff_asf_data_header)) {
738 asf->data_object_offset = avio_tell(pb);
739 /* If not streaming, gsize is not unlimited (how?),
740 * and there is enough space in the file.. */
741 if (!(asf->hdr.flags & 0x01) && gsize >= 100)
742 asf->data_object_size = gsize - 24;
744 asf->data_object_size = (uint64_t)-1;
749 if (!ff_guidcmp(&g, &ff_asf_file_header)) {
750 int ret = asf_read_file_properties(s, gsize);
753 } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
754 int ret = asf_read_stream_properties(s, gsize);
757 } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
758 asf_read_content_desc(s, gsize);
759 } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
760 asf_read_language_list(s, gsize);
761 } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
762 asf_read_ext_content_desc(s, gsize);
763 } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
764 asf_read_metadata(s, gsize);
765 } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
766 asf_read_metadata(s, gsize);
767 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
768 asf_read_ext_stream_properties(s, gsize);
770 // there could be a optional stream properties object to follow
771 // if so the next iteration will pick it up
773 } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
777 } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
778 asf_read_marker(s, gsize);
779 } else if (pb->eof_reached) {
783 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
784 av_log(s, AV_LOG_WARNING,
785 "DRM protected stream detected, decoding will likely fail!\n");
786 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
787 av_log(s, AV_LOG_WARNING,
788 "Ext DRM protected stream detected, decoding will likely fail!\n");
789 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
790 av_log(s, AV_LOG_WARNING,
791 "Digital signature detected, decoding will likely fail!\n");
795 if (avio_tell(pb) != gpos + gsize)
796 av_log(s, AV_LOG_DEBUG,
797 "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
798 avio_tell(pb) - gpos, gsize);
799 avio_seek(pb, gpos + gsize, SEEK_SET);
807 asf->data_offset = avio_tell(pb);
808 asf->packet_size_left = 0;
810 for (i = 0; i < 128; i++) {
811 int stream_num = asf->asfid2avid[i];
812 if (stream_num >= 0) {
813 AVStream *st = s->streams[stream_num];
814 if (!st->codec->bit_rate)
815 st->codec->bit_rate = asf->stream_bitrates[i];
816 if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
817 av_reduce(&st->sample_aspect_ratio.num,
818 &st->sample_aspect_ratio.den,
819 asf->dar[i].num, asf->dar[i].den, INT_MAX);
820 } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
821 // Use ASF container value if the stream doesn't set AR.
822 (st->codec->codec_type == AVMEDIA_TYPE_VIDEO))
823 av_reduce(&st->sample_aspect_ratio.num,
824 &st->sample_aspect_ratio.den,
825 asf->dar[0].num, asf->dar[0].den, INT_MAX);
827 av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
828 i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
829 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
831 // copy and convert language codes to the frontend
832 if (asf->streams[i].stream_language_index < 128) {
833 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
834 if (rfc1766 && strlen(rfc1766) > 1) {
835 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
836 const char *iso6392 = av_convert_lang_to(primary_tag,
837 AV_LANG_ISO639_2_BIBL);
839 av_dict_set(&st->metadata, "language", iso6392, 0);
845 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
850 #define DO_2BITS(bits, var, defval) \
851 switch (bits & 3) { \
853 var = avio_rl32(pb); \
857 var = avio_rl16(pb); \
870 * Load a single ASF packet into the demuxer.
871 * @param s demux context
872 * @param pb context to read data from
873 * @return 0 on success, <0 on error
875 static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
877 ASFContext *asf = s->priv_data;
878 uint32_t packet_length, padsize;
882 // if we do not know packet size, allow skipping up to 32 kB
884 if (asf->no_resync_search)
886 else if (s->packet_size > 0)
887 off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
894 if (c == 0x82 && !d && !e)
899 /* This code allows handling of -EAGAIN at packet boundaries (i.e.
900 * if the packet sync code above triggers -EAGAIN). This does not
901 * imply complete -EAGAIN handling support at random positions in
903 if (pb->error == AVERROR(EAGAIN))
904 return AVERROR(EAGAIN);
905 if (!pb->eof_reached)
906 av_log(s, AV_LOG_ERROR,
907 "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
909 if ((c & 0x8f) == 0x82) {
911 if (!pb->eof_reached)
912 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
918 } else if (!pb->eof_reached) {
919 avio_seek(pb, -1, SEEK_CUR); // FIXME
922 asf->packet_flags = c;
923 asf->packet_property = d;
925 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
926 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
927 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
929 // the following checks prevent overflows and infinite loops
930 if (!packet_length || packet_length >= (1U << 29)) {
931 av_log(s, AV_LOG_ERROR,
932 "invalid packet_length %"PRIu32" at:%"PRId64"\n",
933 packet_length, avio_tell(pb));
936 if (padsize >= packet_length) {
937 av_log(s, AV_LOG_ERROR,
938 "invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
942 asf->packet_timestamp = avio_rl32(pb);
943 avio_rl16(pb); /* duration */
944 // rsize has at least 11 bytes which have to be present
946 if (asf->packet_flags & 0x01) {
947 asf->packet_segsizetype = avio_r8(pb);
949 asf->packet_segments = asf->packet_segsizetype & 0x3f;
951 asf->packet_segments = 1;
952 asf->packet_segsizetype = 0x80;
954 if (rsize > packet_length - padsize) {
955 asf->packet_size_left = 0;
956 av_log(s, AV_LOG_ERROR,
957 "invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
958 rsize, packet_length, padsize, avio_tell(pb));
961 asf->packet_size_left = packet_length - padsize - rsize;
962 if (packet_length < asf->hdr.min_pktsize)
963 padsize += asf->hdr.min_pktsize - packet_length;
964 asf->packet_padsize = padsize;
965 av_dlog(s, "packet: size=%d padsize=%d left=%d\n",
966 s->packet_size, asf->packet_padsize, asf->packet_size_left);
972 * @return <0 if error
974 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
976 ASFContext *asf = s->priv_data;
978 int num = avio_r8(pb);
981 asf->packet_segments--;
982 asf->packet_key_frame = num >> 7;
983 asf->stream_index = asf->asfid2avid[num & 0x7f];
984 // sequence should be ignored!
985 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
986 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
987 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
988 av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
989 asf->packet_key_frame, asf->stream_index, asf->packet_seq,
990 asf->packet_frag_offset, asf->packet_replic_size);
991 if (asf->packet_replic_size >= 8) {
992 asf->packet_obj_size = avio_rl32(pb);
993 if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) {
994 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
997 asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
998 if (asf->packet_replic_size >= 8 + 38 + 4) {
1000 ts0 = avio_rl64(pb);
1004 avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
1006 asf->packet_frag_timestamp = ts0 / 10000;
1008 asf->packet_frag_timestamp = AV_NOPTS_VALUE;
1010 avio_skip(pb, asf->packet_replic_size - 8);
1011 rsize += asf->packet_replic_size; // FIXME - check validity
1012 } else if (asf->packet_replic_size == 1) {
1013 // multipacket - frag_offset is beginning timestamp
1014 asf->packet_time_start = asf->packet_frag_offset;
1015 asf->packet_frag_offset = 0;
1016 asf->packet_frag_timestamp = asf->packet_timestamp;
1018 asf->packet_time_delta = avio_r8(pb);
1020 } else if (asf->packet_replic_size != 0) {
1021 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1022 asf->packet_replic_size);
1025 if (asf->packet_flags & 0x01) {
1026 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1027 if (rsize > asf->packet_size_left) {
1028 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1030 } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1031 if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1032 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
1033 asf->packet_size_left, rsize);
1036 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1037 asf->packet_size_left += diff;
1038 asf->packet_padsize -= diff;
1042 if (rsize > asf->packet_size_left) {
1043 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1046 asf->packet_frag_size = asf->packet_size_left - rsize;
1048 if (asf->packet_replic_size == 1) {
1049 asf->packet_multi_size = asf->packet_frag_size;
1050 if (asf->packet_multi_size > asf->packet_size_left)
1053 asf->packet_size_left -= rsize;
1059 * Parse data from individual ASF packets (which were previously loaded
1060 * with asf_get_packet()).
1061 * @param s demux context
1062 * @param pb context to read data from
1063 * @param pkt pointer to store packet data into
1064 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
1065 * packets need to be loaded (through asf_get_packet())
1067 static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1069 ASFContext *asf = s->priv_data;
1070 ASFStream *asf_st = 0;
1074 if (pb->eof_reached)
1077 if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1078 asf->packet_segments < 1) {
1079 int ret = asf->packet_size_left + asf->packet_padsize;
1085 asf->packet_pos = avio_tell(pb);
1086 if (asf->data_object_size != (uint64_t)-1 &&
1087 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1088 return AVERROR_EOF; /* Do not exceed the size of the data object */
1091 if (asf->packet_time_start == 0) {
1092 if (asf_read_frame_header(s, pb) < 0) {
1093 asf->packet_segments = 0;
1096 if (asf->stream_index < 0 ||
1097 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1098 (!asf->packet_key_frame &&
1099 s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
1100 asf->packet_time_start = 0;
1101 /* unhandled packet (should not happen) */
1102 avio_skip(pb, asf->packet_frag_size);
1103 asf->packet_size_left -= asf->packet_frag_size;
1104 if (asf->stream_index < 0)
1105 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1106 asf->packet_frag_size);
1109 asf->asf_st = s->streams[asf->stream_index]->priv_data;
1111 asf_st = asf->asf_st;
1114 if (!asf_st->frag_offset && asf->packet_frag_offset) {
1115 av_dlog(s, "skipping asf data pkt with fragment offset for "
1116 "stream:%d, expected:%d but got %d from pkt)\n",
1117 asf->stream_index, asf_st->frag_offset,
1118 asf->packet_frag_offset);
1119 avio_skip(pb, asf->packet_frag_size);
1120 asf->packet_size_left -= asf->packet_frag_size;
1124 if (asf->packet_replic_size == 1) {
1125 // frag_offset is here used as the beginning timestamp
1126 asf->packet_frag_timestamp = asf->packet_time_start;
1127 asf->packet_time_start += asf->packet_time_delta;
1128 asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1129 asf->packet_size_left--;
1130 asf->packet_multi_size--;
1131 if (asf->packet_multi_size < asf->packet_obj_size) {
1132 asf->packet_time_start = 0;
1133 avio_skip(pb, asf->packet_multi_size);
1134 asf->packet_size_left -= asf->packet_multi_size;
1137 asf->packet_multi_size -= asf->packet_obj_size;
1139 if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
1140 asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
1141 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
1142 asf_st->frag_offset, asf->packet_frag_size,
1143 asf->packet_obj_size, asf_st->pkt.size);
1144 asf->packet_obj_size = asf_st->pkt.size;
1147 if (asf_st->pkt.size != asf->packet_obj_size ||
1148 // FIXME is this condition sufficient?
1149 asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1150 if (asf_st->pkt.data) {
1151 av_log(s, AV_LOG_INFO,
1152 "freeing incomplete packet size %d, new %d\n",
1153 asf_st->pkt.size, asf->packet_obj_size);
1154 asf_st->frag_offset = 0;
1155 av_free_packet(&asf_st->pkt);
1158 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
1159 asf_st->seq = asf->packet_seq;
1160 asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1161 asf_st->pkt.stream_index = asf->stream_index;
1162 asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1164 if (asf_st->pkt.data && asf_st->palette_changed) {
1166 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
1169 av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1171 memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1172 asf_st->palette_changed = 0;
1175 av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1176 asf->stream_index, asf->packet_key_frame,
1177 asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1178 s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
1179 asf->packet_obj_size);
1180 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
1181 asf->packet_key_frame = 1;
1182 if (asf->packet_key_frame)
1183 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1187 av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1188 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1189 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1190 asf->packet_size_left -= asf->packet_frag_size;
1191 if (asf->packet_size_left < 0)
1194 if (asf->packet_frag_offset >= asf_st->pkt.size ||
1195 asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1196 av_log(s, AV_LOG_ERROR,
1197 "packet fragment position invalid %u,%u not in %u\n",
1198 asf->packet_frag_offset, asf->packet_frag_size,
1203 ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1204 asf->packet_frag_size);
1205 if (ret != asf->packet_frag_size) {
1206 if (ret < 0 || asf->packet_frag_offset + ret == 0)
1207 return ret < 0 ? ret : AVERROR_EOF;
1209 if (asf_st->ds_span > 1) {
1210 // scrambling, we can either drop it completely or fill the remainder
1211 // TODO: should we fill the whole packet instead of just the current
1213 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1214 asf->packet_frag_size - ret);
1215 ret = asf->packet_frag_size;
1217 // no scrambling, so we can return partial packets
1218 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1221 if (s->key && s->keylen == 20)
1222 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1224 asf_st->frag_offset += ret;
1225 /* test if whole packet is read */
1226 if (asf_st->frag_offset == asf_st->pkt.size) {
1227 // workaround for macroshit radio DVR-MS files
1228 if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
1229 asf_st->pkt.size > 100) {
1231 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1233 if (i == asf_st->pkt.size) {
1234 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1235 asf_st->frag_offset = 0;
1236 av_free_packet(&asf_st->pkt);
1242 if (asf_st->ds_span > 1) {
1243 if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1244 av_log(s, AV_LOG_ERROR,
1245 "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1246 asf_st->pkt.size, asf_st->ds_packet_size,
1249 /* packet descrambling */
1250 AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
1251 FF_INPUT_BUFFER_PADDING_SIZE);
1253 uint8_t *newdata = buf->data;
1255 memset(newdata + asf_st->pkt.size, 0,
1256 FF_INPUT_BUFFER_PADDING_SIZE);
1257 while (offset < asf_st->pkt.size) {
1258 int off = offset / asf_st->ds_chunk_size;
1259 int row = off / asf_st->ds_span;
1260 int col = off % asf_st->ds_span;
1261 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1262 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1263 assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1264 memcpy(newdata + offset,
1265 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1266 asf_st->ds_chunk_size);
1267 offset += asf_st->ds_chunk_size;
1269 av_buffer_unref(&asf_st->pkt.buf);
1270 asf_st->pkt.buf = buf;
1271 asf_st->pkt.data = buf->data;
1275 asf_st->frag_offset = 0;
1277 #if FF_API_DESTRUCT_PACKET
1278 FF_DISABLE_DEPRECATION_WARNINGS
1279 asf_st->pkt.destruct = NULL;
1280 FF_ENABLE_DEPRECATION_WARNINGS
1282 asf_st->pkt.buf = 0;
1283 asf_st->pkt.size = 0;
1284 asf_st->pkt.data = 0;
1285 asf_st->pkt.side_data_elems = 0;
1286 asf_st->pkt.side_data = NULL;
1287 break; // packet completed
1293 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1295 ASFContext *asf = s->priv_data;
1300 /* parse cached packets, if any */
1301 if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
1303 if ((ret = asf_get_packet(s, s->pb)) < 0)
1304 assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1305 asf->packet_segments < 1);
1306 asf->packet_time_start = 0;
1310 // Added to support seeking after packets have been read
1311 // If information is not reset, read_packet fails due to
1312 // leftover information from previous reads
1313 static void asf_reset_header(AVFormatContext *s)
1315 ASFContext *asf = s->priv_data;
1319 asf->packet_size_left = 0;
1320 asf->packet_segments = 0;
1321 asf->packet_flags = 0;
1322 asf->packet_property = 0;
1323 asf->packet_timestamp = 0;
1324 asf->packet_segsizetype = 0;
1325 asf->packet_segments = 0;
1326 asf->packet_seq = 0;
1327 asf->packet_replic_size = 0;
1328 asf->packet_key_frame = 0;
1329 asf->packet_padsize = 0;
1330 asf->packet_frag_offset = 0;
1331 asf->packet_frag_size = 0;
1332 asf->packet_frag_timestamp = 0;
1333 asf->packet_multi_size = 0;
1334 asf->packet_obj_size = 0;
1335 asf->packet_time_delta = 0;
1336 asf->packet_time_start = 0;
1338 for (i = 0; i < s->nb_streams; i++) {
1339 asf_st = s->streams[i]->priv_data;
1342 av_free_packet(&asf_st->pkt);
1343 asf_st->frag_offset = 0;
1349 static int asf_read_close(AVFormatContext *s)
1351 asf_reset_header(s);
1356 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1357 int64_t *ppos, int64_t pos_limit)
1359 AVPacket pkt1, *pkt = &pkt1;
1362 int64_t pos = *ppos;
1364 int64_t start_pos[ASF_MAX_STREAMS];
1366 for (i = 0; i < s->nb_streams; i++)
1369 if (s->packet_size > 0)
1370 pos = (pos + s->packet_size - 1 - s->internal->data_offset) /
1371 s->packet_size * s->packet_size +
1372 s->internal->data_offset;
1374 avio_seek(s->pb, pos, SEEK_SET);
1376 asf_reset_header(s);
1378 if (asf_read_packet(s, pkt) < 0) {
1379 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1380 return AV_NOPTS_VALUE;
1385 av_free_packet(pkt);
1386 if (pkt->flags & AV_PKT_FLAG_KEY) {
1387 i = pkt->stream_index;
1389 asf_st = s->streams[i]->priv_data;
1392 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1393 pos = asf_st->packet_pos;
1395 av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1396 pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1397 start_pos[i] = asf_st->packet_pos + 1;
1399 if (pkt->stream_index == stream_index)
1408 static int asf_build_simple_index(AVFormatContext *s, int stream_index)
1411 ASFContext *asf = s->priv_data;
1412 int64_t current_pos = avio_tell(s->pb);
1415 avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1416 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1419 /* the data object can be followed by other top-level objects,
1420 * skip them until the simple index object is reached */
1421 while (ff_guidcmp(&g, &index_guid)) {
1422 int64_t gsize = avio_rl64(s->pb);
1423 if (gsize < 24 || s->pb->eof_reached) {
1426 avio_skip(s->pb, gsize - 24);
1427 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1432 int64_t itime, last_pos = -1;
1434 int64_t av_unused gsize = avio_rl64(s->pb);
1435 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1437 itime = avio_rl64(s->pb);
1438 pct = avio_rl32(s->pb);
1439 ict = avio_rl32(s->pb);
1440 av_log(s, AV_LOG_DEBUG,
1441 "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1443 for (i = 0; i < ict; i++) {
1444 int pktnum = avio_rl32(s->pb);
1445 int pktct = avio_rl16(s->pb);
1446 int64_t pos = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
1447 int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1449 if (pos != last_pos) {
1450 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1451 pktnum, pktct, index_pts);
1452 av_add_index_entry(s->streams[stream_index], pos, index_pts,
1453 s->packet_size, 0, AVINDEX_KEYFRAME);
1457 asf->index_read = ict > 0;
1460 if (s->pb->eof_reached)
1462 avio_seek(s->pb, current_pos, SEEK_SET);
1466 static int asf_read_seek(AVFormatContext *s, int stream_index,
1467 int64_t pts, int flags)
1469 ASFContext *asf = s->priv_data;
1470 AVStream *st = s->streams[stream_index];
1474 if (s->packet_size <= 0)
1477 /* Try using the protocol's read_seek if available */
1479 int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1481 asf_reset_header(s);
1482 if (ret != AVERROR(ENOSYS))
1486 /* explicitly handle the case of seeking to 0 */
1488 asf_reset_header(s);
1489 avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
1493 if (!asf->index_read)
1494 ret = asf_build_simple_index(s, stream_index);
1496 if (!ret && asf->index_read && st->index_entries) {
1497 index = av_index_search_timestamp(st, pts, flags);
1499 /* find the position */
1500 pos = st->index_entries[index].pos;
1503 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1504 avio_seek(s->pb, pos, SEEK_SET);
1505 asf_reset_header(s);
1509 /* no index or seeking by index failed */
1510 if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1512 asf_reset_header(s);
1516 AVInputFormat ff_asf_demuxer = {
1518 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1519 .priv_data_size = sizeof(ASFContext),
1520 .read_probe = asf_probe,
1521 .read_header = asf_read_header,
1522 .read_packet = asf_read_packet,
1523 .read_close = asf_read_close,
1524 .read_seek = asf_read_seek,
1525 .read_timestamp = asf_read_pts,
1526 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1527 .priv_class = &asf_class,