2 * "Real" compatible demuxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
26 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
37 if (buf_size > 0) *q = '\0';
40 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
42 get_strl(pb, buf, buf_size, get_be16(pb));
45 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
47 get_strl(pb, buf, buf_size, get_byte(pb));
50 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
53 RMContext *rm = s->priv_data;
54 ByteIOContext *pb = s->pb;
60 version = get_be32(pb); /* version */
61 if (((version >> 16) & 0xff) == 3) {
62 int64_t startpos = url_ftell(pb);
63 /* very old version */
64 for(i = 0; i < 14; i++)
66 get_str8(pb, s->title, sizeof(s->title));
67 get_str8(pb, s->author, sizeof(s->author));
68 get_str8(pb, s->copyright, sizeof(s->copyright));
69 get_str8(pb, s->comment, sizeof(s->comment));
70 if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
71 // fourcc (should always be "lpcJ")
73 get_str8(pb, buf, sizeof(buf));
75 // Skip extra header crap (this should never happen)
76 if ((startpos + (version & 0xffff)) > url_ftell(pb))
77 url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
78 st->codec->sample_rate = 8000;
79 st->codec->channels = 1;
80 st->codec->codec_type = CODEC_TYPE_AUDIO;
81 st->codec->codec_id = CODEC_ID_RA_144;
83 int flavor, sub_packet_h, coded_framesize, sub_packet_size;
85 get_be32(pb); /* .ra4 */
86 get_be32(pb); /* data size */
87 get_be16(pb); /* version2 */
88 get_be32(pb); /* header size */
89 flavor= get_be16(pb); /* add codec info / flavor */
90 rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
91 get_be32(pb); /* ??? */
92 get_be32(pb); /* ??? */
93 get_be32(pb); /* ??? */
94 rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
95 st->codec->block_align= get_be16(pb); /* frame size */
96 rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
97 get_be16(pb); /* ??? */
98 if (((version >> 16) & 0xff) == 5) {
99 get_be16(pb); get_be16(pb); get_be16(pb); }
100 st->codec->sample_rate = get_be16(pb);
102 st->codec->channels = get_be16(pb);
103 if (((version >> 16) & 0xff) == 5) {
105 buf[0] = get_byte(pb);
106 buf[1] = get_byte(pb);
107 buf[2] = get_byte(pb);
108 buf[3] = get_byte(pb);
111 get_str8(pb, buf, sizeof(buf)); /* desc */
112 get_str8(pb, buf, sizeof(buf)); /* desc */
114 st->codec->codec_type = CODEC_TYPE_AUDIO;
115 if (!strcmp(buf, "dnet")) {
116 st->codec->codec_id = CODEC_ID_AC3;
117 st->need_parsing = AVSTREAM_PARSE_FULL;
118 } else if (!strcmp(buf, "28_8")) {
119 st->codec->codec_id = CODEC_ID_RA_288;
120 st->codec->extradata_size= 0;
121 rm->audio_framesize = st->codec->block_align;
122 st->codec->block_align = coded_framesize;
124 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
125 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
129 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
130 } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
131 int codecdata_length, i;
132 get_be16(pb); get_byte(pb);
133 if (((version >> 16) & 0xff) == 5)
135 codecdata_length = get_be32(pb);
136 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
137 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
141 if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
142 else st->codec->codec_id = CODEC_ID_ATRAC3;
143 st->codec->extradata_size= codecdata_length;
144 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
145 for(i = 0; i < codecdata_length; i++)
146 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
147 rm->audio_framesize = st->codec->block_align;
148 st->codec->block_align = rm->sub_packet_size;
150 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
151 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
155 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
156 } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
157 int codecdata_length, i;
158 get_be16(pb); get_byte(pb);
159 if (((version >> 16) & 0xff) == 5)
161 st->codec->codec_id = CODEC_ID_AAC;
162 codecdata_length = get_be32(pb);
163 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
164 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
167 if (codecdata_length >= 1) {
168 st->codec->extradata_size = codecdata_length - 1;
169 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
171 for(i = 0; i < st->codec->extradata_size; i++)
172 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
175 st->codec->codec_id = CODEC_ID_NONE;
176 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
183 get_str8(pb, s->title, sizeof(s->title));
184 get_str8(pb, s->author, sizeof(s->author));
185 get_str8(pb, s->copyright, sizeof(s->copyright));
186 get_str8(pb, s->comment, sizeof(s->comment));
193 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
195 ByteIOContext *pb = s->pb;
197 int codec_data_size, size;
200 codec_data_size = get_be32(pb);
201 codec_pos = url_ftell(pb);
203 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
205 if (rm_read_audio_stream_info(s, st, 0))
209 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
211 av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
214 st->codec->codec_tag = get_le32(pb);
215 // av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
216 if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
217 && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
218 && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
219 && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
221 st->codec->width = get_be16(pb);
222 st->codec->height = get_be16(pb);
223 st->codec->time_base.num= 1;
225 st->codec->codec_type = CODEC_TYPE_VIDEO;
230 st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
232 if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
233 //check is redundant as get_buffer() will catch this
234 av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
237 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
238 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
240 // av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
241 st->codec->time_base.den = fps * st->codec->time_base.num;
242 switch(((uint8_t*)st->codec->extradata)[4]>>4){
243 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
244 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
245 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
246 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
252 /* skip codec info */
253 size = url_ftell(pb) - codec_pos;
254 url_fskip(pb, codec_data_size - size);
260 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
262 RMContext *rm = s->priv_data;
266 st = av_new_stream(s, 0);
269 return rm_read_audio_stream_info(s, st, 1);
272 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
274 RMContext *rm = s->priv_data;
276 ByteIOContext *pb = s->pb;
279 unsigned int start_time, duration;
284 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
285 /* very old .ra format */
286 return rm_read_header_old(s, ap);
287 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
291 get_be32(pb); /* header size */
294 get_be32(pb); /* number of headers */
300 tag_size = get_be32(pb);
303 printf("tag=%c%c%c%c (%08x) size=%d\n",
311 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
314 case MKTAG('P', 'R', 'O', 'P'):
316 get_be32(pb); /* max bit rate */
317 get_be32(pb); /* avg bit rate */
318 get_be32(pb); /* max packet size */
319 get_be32(pb); /* avg packet size */
320 get_be32(pb); /* nb packets */
321 get_be32(pb); /* duration */
322 get_be32(pb); /* preroll */
323 get_be32(pb); /* index offset */
324 get_be32(pb); /* data offset */
325 get_be16(pb); /* nb streams */
326 flags = get_be16(pb); /* flags */
328 case MKTAG('C', 'O', 'N', 'T'):
329 get_str16(pb, s->title, sizeof(s->title));
330 get_str16(pb, s->author, sizeof(s->author));
331 get_str16(pb, s->copyright, sizeof(s->copyright));
332 get_str16(pb, s->comment, sizeof(s->comment));
334 case MKTAG('M', 'D', 'P', 'R'):
335 st = av_new_stream(s, 0);
338 st->id = get_be16(pb);
339 get_be32(pb); /* max bit rate */
340 st->codec->bit_rate = get_be32(pb); /* bit rate */
341 get_be32(pb); /* max packet size */
342 get_be32(pb); /* avg packet size */
343 start_time = get_be32(pb); /* start time */
344 get_be32(pb); /* preroll */
345 duration = get_be32(pb); /* duration */
346 st->start_time = start_time;
347 st->duration = duration;
348 get_str8(pb, buf, sizeof(buf)); /* desc */
349 get_str8(pb, buf, sizeof(buf)); /* mimetype */
350 st->codec->codec_type = CODEC_TYPE_DATA;
351 av_set_pts_info(st, 64, 1, 1000);
352 if (ff_rm_read_mdpr_codecdata(s, st) < 0)
355 case MKTAG('D', 'A', 'T', 'A'):
358 /* unknown tag: skip it */
359 url_fskip(pb, tag_size - 10);
364 rm->nb_packets = get_be32(pb); /* number of packets */
365 if (!rm->nb_packets && (flags & 4))
366 rm->nb_packets = 3600 * 25;
367 get_be32(pb); /* next data header */
372 for(i=0;i<s->nb_streams;i++) {
373 av_free(s->streams[i]);
378 static int get_num(ByteIOContext *pb, int *len)
390 return (n << 16) | n1;
394 /* multiple of 20 bytes for ra144 (ugly) */
395 #define RAW_PACKET_SIZE 1000
397 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
398 RMContext *rm = s->priv_data;
399 ByteIOContext *pb = s->pb;
400 int len, num, res, i;
402 uint32_t state=0xFFFFFFFF;
404 while(!url_feof(pb)){
405 *pos= url_ftell(pb) - 3;
406 if(rm->remaining_len > 0){
407 num= rm->current_stream;
408 len= rm->remaining_len;
409 *timestamp = AV_NOPTS_VALUE;
412 state= (state<<8) + get_byte(pb);
414 if(state == MKBETAG('I', 'N', 'D', 'X')){
415 len = get_be16(pb) - 6;
421 if(state > (unsigned)0xFFFF || state < 12)
427 *timestamp = get_be32(pb);
428 res= get_byte(pb); /* reserved */
429 *flags = get_byte(pb); /* flags */
434 for(i=0;i<s->nb_streams;i++) {
439 if (i == s->nb_streams) {
441 /* skip packet if unknown number */
443 rm->remaining_len -= len;
453 static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
455 ByteIOContext *pb = s->pb;
456 int hdr, seq, pic_num, len2, pos;
459 hdr = get_byte(pb); len--;
463 case 2: // last slice
464 seq = get_byte(pb); len--;
465 len2 = get_num(pb, &len);
466 pos = get_num(pb, &len);
467 pic_num = get_byte(pb); len--;
468 rm->remaining_len = len;
470 case 1: //whole frame
471 seq = get_byte(pb); len--;
472 if(av_new_packet(pkt, len + 9) < 0)
475 AV_WL32(pkt->data + 1, 1);
476 AV_WL32(pkt->data + 5, 0);
477 get_buffer(pb, pkt->data + 9, len);
478 rm->remaining_len = 0;
480 case 3: //frame as a part of packet
481 len2 = get_num(pb, &len);
482 pos = get_num(pb, &len);
483 pic_num = get_byte(pb); len--;
484 rm->remaining_len = len - len2;
485 if(av_new_packet(pkt, len2 + 9) < 0)
488 AV_WL32(pkt->data + 1, 1);
489 AV_WL32(pkt->data + 5, 0);
490 get_buffer(pb, pkt->data + 9, len2);
493 //now we have to deal with single slice
495 if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
496 rm->slices = ((hdr & 0x3F) << 1) + 1;
497 rm->videobufsize = len2 + 8*rm->slices + 1;
498 av_free(rm->videobuf);
499 if(!(rm->videobuf = av_malloc(rm->videobufsize)))
500 return AVERROR(ENOMEM);
501 rm->videobufpos = 8*rm->slices + 1;
503 rm->curpic_num = pic_num;
504 rm->pktpos = url_ftell(pb);
507 len = FFMIN(len, pos);
509 if(++rm->cur_slice > rm->slices)
511 AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
512 AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
513 if(rm->videobufpos + len > rm->videobufsize)
515 if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
517 rm->videobufpos += len;
518 rm->remaining_len-= len;
520 if(type == 2 || (rm->videobufpos) == rm->videobufsize){
521 rm->videobuf[0] = rm->cur_slice-1;
522 if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)
523 return AVERROR(ENOMEM);
524 memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);
525 memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,
526 rm->videobufpos - 1 - 8*rm->slices);
527 pkt->pts = AV_NOPTS_VALUE;
528 pkt->pos = rm->pktpos;
536 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
541 if (st->codec->codec_id == CODEC_ID_AC3) {
543 for (j=0;j<pkt->size;j+=2) {
544 FFSWAP(int, ptr[0], ptr[1]);
551 ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
552 int *seq, int *flags, int64_t *timestamp)
554 ByteIOContext *pb = s->pb;
555 RMContext *rm = s->priv_data;
557 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
558 rm->current_stream= st->id;
559 if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
560 return -1; //got partial frame
561 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
562 if ((st->codec->codec_id == CODEC_ID_RA_288) ||
563 (st->codec->codec_id == CODEC_ID_COOK) ||
564 (st->codec->codec_id == CODEC_ID_ATRAC3)) {
566 int sps = rm->sub_packet_size;
567 int cfs = rm->coded_framesize;
568 int h = rm->sub_packet_h;
569 int y = rm->sub_packet_cnt;
570 int w = rm->audio_framesize;
573 y = rm->sub_packet_cnt = 0;
575 rm->audiotimestamp = *timestamp;
577 switch(st->codec->codec_id) {
578 case CODEC_ID_RA_288:
579 for (x = 0; x < h/2; x++)
580 get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
582 case CODEC_ID_ATRAC3:
584 for (x = 0; x < w/sps; x++)
585 get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
589 if (++(rm->sub_packet_cnt) < h)
592 rm->sub_packet_cnt = 0;
593 rm->audio_stream_num = st->index;
594 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
595 // Release first audio packet
596 av_new_packet(pkt, st->codec->block_align);
597 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
598 *timestamp = rm->audiotimestamp;
599 *flags = 2; // Mark first packet as keyframe
601 } else if (st->codec->codec_id == CODEC_ID_AAC) {
603 rm->audio_stream_num = st->index;
604 rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
605 if (rm->sub_packet_cnt) {
606 for (x = 0; x < rm->sub_packet_cnt; x++)
607 rm->sub_packet_lengths[x] = get_be16(pb);
608 // Release first audio packet
609 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
610 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
611 *flags = 2; // Mark first packet as keyframe
614 av_get_packet(pb, pkt, len);
615 rm_ac3_swap_bytes(st, pkt);
618 av_get_packet(pb, pkt, len);
620 if( (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
621 || st->discard >= AVDISCARD_ALL){
626 pkt->stream_index = st->index;
629 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
630 if(st->codec->codec_id == CODEC_ID_RV20){
631 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
632 av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
634 seq |= (*timestamp&~0x3FFF);
635 if(seq - *timestamp > 0x2000) seq -= 0x4000;
636 if(seq - *timestamp < -0x2000) seq += 0x4000;
641 pkt->pts= *timestamp;
643 pkt->flags |= PKT_FLAG_KEY;
649 ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)
651 ByteIOContext *pb = s->pb;
652 RMContext *rm = s->priv_data;
654 assert (rm->audio_pkt_cnt > 0);
656 if (st->codec->codec_id == CODEC_ID_AAC)
657 av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
659 av_new_packet(pkt, st->codec->block_align);
660 memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
661 (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
662 st->codec->block_align);
666 pkt->stream_index = st->index;
669 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
671 RMContext *rm = s->priv_data;
672 ByteIOContext *pb = s->pb;
675 int64_t timestamp, pos;
678 if (rm->audio_pkt_cnt) {
679 // If there are queued audio packet return them first
680 st = s->streams[rm->audio_stream_num];
681 ff_rm_retrieve_cache(s, st, pkt);
682 } else if (rm->old_format) {
684 if (st->codec->codec_id == CODEC_ID_RA_288) {
687 for (y = 0; y < rm->sub_packet_h; y++)
688 for (x = 0; x < rm->sub_packet_h/2; x++)
689 if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
691 rm->audio_stream_num = 0;
692 rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
693 // Release first audio packet
694 av_new_packet(pkt, st->codec->block_align);
695 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
696 pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
697 pkt->stream_index = 0;
699 /* just read raw bytes */
700 len = RAW_PACKET_SIZE;
701 len= av_get_packet(pb, pkt, len);
702 pkt->stream_index = 0;
708 rm_ac3_swap_bytes(st, pkt);
712 len=sync(s, ×tamp, &flags, &i, &pos);
717 if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, ×tamp) < 0)
720 if((flags&2) && (seq&0x7F) == 1)
721 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
727 static int rm_read_close(AVFormatContext *s)
729 RMContext *rm = s->priv_data;
731 av_free(rm->audiobuf);
732 av_free(rm->videobuf);
736 static int rm_probe(AVProbeData *p)
738 /* check file header */
739 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
740 p->buf[2] == 'M' && p->buf[3] == 'F' &&
741 p->buf[4] == 0 && p->buf[5] == 0) ||
742 (p->buf[0] == '.' && p->buf[1] == 'r' &&
743 p->buf[2] == 'a' && p->buf[3] == 0xfd))
744 return AVPROBE_SCORE_MAX;
749 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
750 int64_t *ppos, int64_t pos_limit)
752 RMContext *rm = s->priv_data;
754 int stream_index2, flags, len, h;
759 return AV_NOPTS_VALUE;
761 url_fseek(s->pb, pos, SEEK_SET);
767 len=sync(s, &dts, &flags, &stream_index2, &pos);
769 return AV_NOPTS_VALUE;
771 st = s->streams[stream_index2];
772 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
773 h= get_byte(s->pb); len--;
775 seq = get_byte(s->pb); len--;
779 if((flags&2) && (seq&0x7F) == 1){
780 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
781 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
782 if(stream_index2 == stream_index)
786 url_fskip(s->pb, len);
792 AVInputFormat rm_demuxer = {