2 * ASF compatible decoder.
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "mpegaudio.h"
27 #define FRAME_HEADER_SIZE 17
28 // Fix Me! FRAME_HEADER_SIZE may be different.
30 static const GUID index_guid = {
31 0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
34 /**********************************/
40 #define PRINT_IF_GUID(g,cmp) \
41 if (!memcmp(g, &cmp, sizeof(GUID))) \
42 printf("(GUID: %s) ", #cmp)
44 static void print_guid(const GUID *g)
47 PRINT_IF_GUID(g, asf_header);
48 else PRINT_IF_GUID(g, file_header);
49 else PRINT_IF_GUID(g, stream_header);
50 else PRINT_IF_GUID(g, audio_stream);
51 else PRINT_IF_GUID(g, audio_conceal_none);
52 else PRINT_IF_GUID(g, video_stream);
53 else PRINT_IF_GUID(g, video_conceal_none);
54 else PRINT_IF_GUID(g, comment_header);
55 else PRINT_IF_GUID(g, codec_comment_header);
56 else PRINT_IF_GUID(g, codec_comment1_header);
57 else PRINT_IF_GUID(g, data_header);
58 else PRINT_IF_GUID(g, index_guid);
59 else PRINT_IF_GUID(g, head1_guid);
60 else PRINT_IF_GUID(g, head2_guid);
61 else PRINT_IF_GUID(g, my_guid);
63 printf("(GUID: unknown) ");
64 printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
66 printf(" 0x%02x,", g->v4[i]);
69 #undef PRINT_IF_GUID(g,cmp)
72 static void get_guid(ByteIOContext *s, GUID *g)
80 g->v4[i] = get_byte(s);
84 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
93 if ((q - buf) < buf_size - 1)
101 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 if ((q - buf) < buf_size - 1)
116 static int asf_probe(AVProbeData *pd)
119 const unsigned char *p;
122 /* check file header */
123 if (pd->buf_size <= 32)
126 g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
128 g.v2 = p[0] | (p[1] << 8);
130 g.v3 = p[0] | (p[1] << 8);
135 if (!memcmp(&g, &asf_header, sizeof(GUID)))
136 return AVPROBE_SCORE_MAX;
141 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
143 ASFContext *asf = s->priv_data;
145 ByteIOContext *pb = &s->pb;
152 if (memcmp(&g, &asf_header, sizeof(GUID)))
158 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
161 gsize = get_le64(pb);
163 printf("%08Lx: ", url_ftell(pb) - 24);
165 printf(" size=0x%Lx\n", gsize);
169 if (!memcmp(&g, &file_header, sizeof(GUID))) {
170 get_guid(pb, &asf->hdr.guid);
171 asf->hdr.file_size = get_le64(pb);
172 asf->hdr.create_time = get_le64(pb);
173 asf->hdr.packets_count = get_le64(pb);
174 asf->hdr.play_time = get_le64(pb);
175 asf->hdr.send_time = get_le64(pb);
176 asf->hdr.preroll = get_le32(pb);
177 asf->hdr.ignore = get_le32(pb);
178 asf->hdr.flags = get_le32(pb);
179 asf->hdr.min_pktsize = get_le32(pb);
180 asf->hdr.max_pktsize = get_le32(pb);
181 asf->hdr.max_bitrate = get_le32(pb);
182 asf->packet_size = asf->hdr.max_pktsize;
183 asf->nb_packets = asf->hdr.packets_count;
184 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
185 int type, total_size, type_specific_size;
189 pos1 = url_ftell(pb);
191 st = av_new_stream(s, 0);
194 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
195 asf_st = av_mallocz(sizeof(ASFStream));
198 st->priv_data = asf_st;
199 st->start_time = asf->hdr.preroll * (int64_t)AV_TIME_BASE / 1000;
200 st->duration = asf->hdr.send_time /
201 (10000000 / AV_TIME_BASE) - st->start_time;
203 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
204 type = CODEC_TYPE_AUDIO;
205 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
206 type = CODEC_TYPE_VIDEO;
211 total_size = get_le64(pb);
212 type_specific_size = get_le32(pb);
214 st->id = get_le16(pb) & 0x7f; /* stream id */
215 // mapping of asf ID to AV stream ID;
216 asf->asfid2avid[st->id] = s->nb_streams - 1;
219 st->codec.codec_type = type;
220 /* 1 fps default (XXX: put 0 fps instead) */
221 st->codec.frame_rate = 1000;
222 st->codec.frame_rate_base = 1;
223 if (type == CODEC_TYPE_AUDIO) {
224 get_wav_header(pb, &st->codec, type_specific_size);
225 st->need_parsing = 1;
226 /* We have to init the frame size at some point .... */
227 pos2 = url_ftell(pb);
228 if (gsize > (pos2 + 8 - pos1 + 24)) {
229 asf_st->ds_span = get_byte(pb);
230 asf_st->ds_packet_size = get_le16(pb);
231 asf_st->ds_chunk_size = get_le16(pb);
232 asf_st->ds_data_size = get_le16(pb);
233 asf_st->ds_silence_data = get_byte(pb);
235 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
236 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
237 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
238 if (asf_st->ds_span > 1) {
239 if (!asf_st->ds_chunk_size
240 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
241 asf_st->ds_span = 0; // disable descrambling
243 switch (st->codec.codec_id) {
245 st->codec.frame_size = MPA_FRAME_SIZE;
247 case CODEC_ID_PCM_S16LE:
248 case CODEC_ID_PCM_S16BE:
249 case CODEC_ID_PCM_U16LE:
250 case CODEC_ID_PCM_U16BE:
251 case CODEC_ID_PCM_S8:
252 case CODEC_ID_PCM_U8:
253 case CODEC_ID_PCM_ALAW:
254 case CODEC_ID_PCM_MULAW:
255 st->codec.frame_size = 1;
258 /* This is probably wrong, but it prevents a crash later */
259 st->codec.frame_size = 1;
266 size = get_le16(pb); /* size */
267 get_le32(pb); /* size */
268 st->codec.width = get_le32(pb);
269 st->codec.height = get_le32(pb);
270 /* not available for asf */
271 get_le16(pb); /* panes */
272 st->codec.bits_per_sample = get_le16(pb); /* depth */
276 st->codec.extradata_size = size - 40;
277 st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
278 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
281 /* Extract palette from extradata if bpp <= 8 */
282 /* This code assumes that extradata contains only palette */
283 /* This is true for all paletted codecs implemented in ffmpeg */
284 if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
285 st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
286 #ifdef WORDS_BIGENDIAN
287 for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
288 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
290 memcpy(st->codec.palctrl->palette, st->codec.extradata,
291 FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
293 st->codec.palctrl->palette_changed = 1;
296 st->codec.codec_tag = tag1;
297 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
298 if(tag1 == MKTAG('D', 'V', 'R', ' '))
299 st->need_parsing = 1;
301 pos2 = url_ftell(pb);
302 url_fskip(pb, gsize - (pos2 - pos1 + 24));
303 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
305 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
306 int len1, len2, len3, len4, len5;
313 get_str16_nolen(pb, len1, s->title, sizeof(s->title));
314 get_str16_nolen(pb, len2, s->author, sizeof(s->author));
315 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
316 get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
318 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
321 desc_count = get_le16(pb);
322 for(i=0;i<desc_count;i++)
324 int name_len,value_type,value_len,value_num = 0;
327 name_len = get_le16(pb);
328 name = (char *)av_mallocz(name_len);
329 get_str16_nolen(pb, name_len, name, name_len);
330 value_type = get_le16(pb);
331 value_len = get_le16(pb);
332 if ((value_type == 0) || (value_type == 1)) // unicode or byte
334 value = (char *)av_mallocz(value_len);
335 get_str16_nolen(pb, value_len, value, value_len);
336 if (strcmp(name,"WM/AlbumTitle")==0) { strcpy(s->album, value); }
339 if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
341 if (value_type==2) value_num = get_le32(pb);
342 if (value_type==3) value_num = get_le32(pb);
343 if (value_type==4) value_num = get_le64(pb);
344 if (value_type==5) value_num = get_le16(pb);
345 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
346 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
351 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
356 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
366 num = get_le16(pb); /* stream number */
367 get_str16(pb, str, sizeof(str));
368 get_str16(pb, str, sizeof(str));
373 if ((q - tag) < sizeof(tag) - 1)
380 } else if (url_feof(pb)) {
383 url_fseek(pb, gsize - 24, SEEK_CUR);
392 asf->data_offset = url_ftell(pb);
393 asf->packet_size_left = 0;
398 for(i=0;i<s->nb_streams;i++) {
399 AVStream *st = s->streams[i];
401 av_free(st->priv_data);
402 av_free(st->codec.extradata);
409 #define DO_2BITS(bits, var, defval) \
412 case 3: var = get_le32(pb); rsize += 4; break; \
413 case 2: var = get_le16(pb); rsize += 2; break; \
414 case 1: var = get_byte(pb); rsize++; break; \
415 default: var = defval; break; \
418 static int asf_get_packet(AVFormatContext *s)
420 ASFContext *asf = s->priv_data;
421 ByteIOContext *pb = &s->pb;
422 uint32_t packet_length, padsize;
426 if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
428 assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
433 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%lld\n", c, url_ftell(pb));
435 if ((c & 0x0f) == 2) { // always true for now
436 if (get_le16(pb) != 0) {
438 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
444 printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
448 asf->packet_flags = get_byte(pb);
449 asf->packet_property = get_byte(pb);
451 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
452 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
453 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
455 asf->packet_timestamp = get_le32(pb);
456 get_le16(pb); /* duration */
457 // rsize has at least 11 bytes which have to be present
459 if (asf->packet_flags & 0x01) {
460 asf->packet_segsizetype = get_byte(pb); rsize++;
461 asf->packet_segments = asf->packet_segsizetype & 0x3f;
463 asf->packet_segments = 1;
464 asf->packet_segsizetype = 0x80;
466 asf->packet_size_left = packet_length - padsize - rsize;
467 if (packet_length < asf->hdr.min_pktsize)
468 padsize += asf->hdr.min_pktsize - packet_length;
469 asf->packet_padsize = padsize;
471 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
476 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
478 ASFContext *asf = s->priv_data;
479 ASFStream *asf_st = 0;
480 ByteIOContext *pb = &s->pb;
484 if (asf->packet_size_left < FRAME_HEADER_SIZE
485 || asf->packet_segments < 1) {
486 //asf->packet_size_left <= asf->packet_padsize) {
487 int ret = asf->packet_size_left + asf->packet_padsize;
488 //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
491 asf->packet_pos= url_ftell(&s->pb);
492 ret = asf_get_packet(s);
493 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
494 if (ret < 0 || url_feof(pb))
496 asf->packet_time_start = 0;
499 if (asf->packet_time_start == 0) {
500 /* read frame header */
501 int num = get_byte(pb);
502 asf->packet_segments--;
504 asf->packet_key_frame = (num & 0x80) >> 7;
505 asf->stream_index = asf->asfid2avid[num & 0x7f];
506 // sequence should be ignored!
507 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
508 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
509 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
510 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
511 if (asf->packet_replic_size > 1) {
512 assert(asf->packet_replic_size >= 8);
513 // it should be always at least 8 bytes - FIXME validate
514 asf->packet_obj_size = get_le32(pb);
515 asf->packet_frag_timestamp = get_le32(pb); // timestamp
516 if (asf->packet_replic_size > 8)
517 url_fskip(pb, asf->packet_replic_size - 8);
518 rsize += asf->packet_replic_size; // FIXME - check validity
519 } else if (asf->packet_replic_size==1){
520 // multipacket - frag_offset is begining timestamp
521 asf->packet_time_start = asf->packet_frag_offset;
522 asf->packet_frag_offset = 0;
523 asf->packet_frag_timestamp = asf->packet_timestamp;
525 asf->packet_time_delta = get_byte(pb);
528 assert(asf->packet_replic_size==0);
530 if (asf->packet_flags & 0x01) {
531 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
533 //printf("Fragsize %d\n", asf->packet_frag_size);
535 asf->packet_frag_size = asf->packet_size_left - rsize;
536 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
538 if (asf->packet_replic_size == 1) {
539 asf->packet_multi_size = asf->packet_frag_size;
540 if (asf->packet_multi_size > asf->packet_size_left) {
541 asf->packet_segments = 0;
545 asf->packet_size_left -= rsize;
546 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
548 if (asf->stream_index < 0) {
549 asf->packet_time_start = 0;
550 /* unhandled packet (should not happen) */
551 url_fskip(pb, asf->packet_frag_size);
552 asf->packet_size_left -= asf->packet_frag_size;
553 av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
556 asf->asf_st = s->streams[asf->stream_index]->priv_data;
558 asf_st = asf->asf_st;
560 if ((asf->packet_frag_offset != asf_st->frag_offset
561 || (asf->packet_frag_offset
562 && asf->packet_seq != asf_st->seq)) // seq should be ignored
564 /* cannot continue current packet: free it */
565 // FIXME better check if packet was already allocated
566 av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
568 asf->packet_obj_size,
569 asf->packet_frag_offset, asf_st->frag_offset,
570 asf->packet_seq, asf_st->seq, asf->packet_frag_size);
571 if (asf_st->pkt.size)
572 av_free_packet(&asf_st->pkt);
573 asf_st->frag_offset = 0;
574 if (asf->packet_frag_offset != 0) {
575 url_fskip(pb, asf->packet_frag_size);
576 av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
577 asf->packet_size_left -= asf->packet_frag_size;
581 if (asf->packet_replic_size == 1) {
582 // frag_offset is here used as the begining timestamp
583 asf->packet_frag_timestamp = asf->packet_time_start;
584 asf->packet_time_start += asf->packet_time_delta;
585 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
586 asf->packet_size_left--;
587 asf->packet_multi_size--;
588 if (asf->packet_multi_size < asf->packet_obj_size)
590 asf->packet_time_start = 0;
591 url_fskip(pb, asf->packet_multi_size);
592 asf->packet_size_left -= asf->packet_multi_size;
595 asf->packet_multi_size -= asf->packet_obj_size;
596 //printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
598 if (asf_st->frag_offset == 0) {
600 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
601 asf_st->seq = asf->packet_seq;
602 asf_st->pkt.pts = asf->packet_frag_timestamp;
603 asf_st->pkt.stream_index = asf->stream_index;
604 asf_st->packet_pos= asf->packet_pos;
605 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
606 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
607 //s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
608 if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO)
609 asf->packet_key_frame = 1;
610 if (asf->packet_key_frame)
611 asf_st->pkt.flags |= PKT_FLAG_KEY;
615 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
616 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
617 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
618 asf->packet_size_left -= asf->packet_frag_size;
619 if (asf->packet_size_left < 0)
621 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
622 asf->packet_frag_size);
623 asf_st->frag_offset += asf->packet_frag_size;
624 /* test if whole packet is read */
625 if (asf_st->frag_offset == asf_st->pkt.size) {
627 if (asf_st->ds_span > 1) {
628 /* packet descrambling */
629 char* newdata = av_malloc(asf_st->pkt.size);
632 while (offset < asf_st->pkt.size) {
633 int off = offset / asf_st->ds_chunk_size;
634 int row = off / asf_st->ds_span;
635 int col = off % asf_st->ds_span;
636 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
637 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
638 memcpy(newdata + offset,
639 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
640 asf_st->ds_chunk_size);
641 offset += asf_st->ds_chunk_size;
643 av_free(asf_st->pkt.data);
644 asf_st->pkt.data = newdata;
647 asf_st->frag_offset = 0;
648 memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
649 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
650 asf_st->pkt.size = 0;
651 asf_st->pkt.data = 0;
652 break; // packet completed
658 static int asf_read_close(AVFormatContext *s)
662 for(i=0;i<s->nb_streams;i++) {
663 AVStream *st = s->streams[i];
664 av_free(st->priv_data);
665 av_free(st->codec.extradata);
666 av_free(st->codec.palctrl);
671 // Added to support seeking after packets have been read
672 // If information is not reset, read_packet fails due to
673 // leftover information from previous reads
674 static void asf_reset_header(AVFormatContext *s)
676 ASFContext *asf = s->priv_data;
680 asf->packet_nb_frames = 0;
681 asf->packet_timestamp_start = -1;
682 asf->packet_timestamp_end = -1;
683 asf->packet_size_left = 0;
684 asf->packet_segments = 0;
685 asf->packet_flags = 0;
686 asf->packet_property = 0;
687 asf->packet_timestamp = 0;
688 asf->packet_segsizetype = 0;
689 asf->packet_segments = 0;
691 asf->packet_replic_size = 0;
692 asf->packet_key_frame = 0;
693 asf->packet_padsize = 0;
694 asf->packet_frag_offset = 0;
695 asf->packet_frag_size = 0;
696 asf->packet_frag_timestamp = 0;
697 asf->packet_multi_size = 0;
698 asf->packet_obj_size = 0;
699 asf->packet_time_delta = 0;
700 asf->packet_time_start = 0;
702 for(i=0; i<s->nb_streams; i++){
703 asf_st= s->streams[i]->priv_data;
704 av_free_packet(&asf_st->pkt);
705 asf_st->frag_offset=0;
711 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
713 ASFContext *asf = s->priv_data;
714 AVPacket pkt1, *pkt = &pkt1;
719 int64_t start_pos[s->nb_streams];
721 for(i=0; i<s->nb_streams; i++){
725 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
727 url_fseek(&s->pb, pos, SEEK_SET);
729 //printf("asf_read_pts\n");
732 if (av_read_frame(s, pkt) < 0){
733 av_log(s, AV_LOG_INFO, "seek failed\n");
734 return AV_NOPTS_VALUE;
737 pts= pkt->pts * 1000 / AV_TIME_BASE;
740 if(pkt->flags&PKT_FLAG_KEY){
741 i= pkt->stream_index;
743 asf_st= s->streams[i]->priv_data;
745 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
746 pos= asf_st->packet_pos;
748 av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
749 start_pos[i]= asf_st->packet_pos + 1;
751 if(pkt->stream_index == stream_index)
757 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
762 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
764 ASFContext *asf = s->priv_data;
766 if (asf->packet_size <= 0)
769 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
776 static AVInputFormat asf_iformat = {
788 #ifdef CONFIG_ENCODERS
789 extern AVOutputFormat asf_oformat;
790 extern AVOutputFormat asf_stream_oformat;
791 #endif //CONFIG_ENCODERS
795 av_register_input_format(&asf_iformat);
796 #ifdef CONFIG_ENCODERS
797 av_register_output_format(&asf_oformat);
798 av_register_output_format(&asf_stream_oformat);
799 #endif //CONFIG_ENCODERS