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
25 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
36 if (buf_size > 0) *q = '\0';
39 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
41 get_strl(pb, buf, buf_size, get_be16(pb));
44 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
46 get_strl(pb, buf, buf_size, get_byte(pb));
49 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
52 RMContext *rm = s->priv_data;
53 ByteIOContext *pb = &s->pb;
59 version = get_be32(pb); /* version */
60 if (((version >> 16) & 0xff) == 3) {
61 int64_t startpos = url_ftell(pb);
62 /* very old version */
63 for(i = 0; i < 14; i++)
65 get_str8(pb, s->title, sizeof(s->title));
66 get_str8(pb, s->author, sizeof(s->author));
67 get_str8(pb, s->copyright, sizeof(s->copyright));
68 get_str8(pb, s->comment, sizeof(s->comment));
69 if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
70 // fourcc (should always be "lpcJ")
72 get_str8(pb, buf, sizeof(buf));
74 // Skip extra header crap (this should never happen)
75 if ((startpos + (version & 0xffff)) > url_ftell(pb))
76 url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
77 st->codec->sample_rate = 8000;
78 st->codec->channels = 1;
79 st->codec->codec_type = CODEC_TYPE_AUDIO;
80 st->codec->codec_id = CODEC_ID_RA_144;
82 int flavor, sub_packet_h, coded_framesize, sub_packet_size;
84 get_be32(pb); /* .ra4 */
85 get_be32(pb); /* data size */
86 get_be16(pb); /* version2 */
87 get_be32(pb); /* header size */
88 flavor= get_be16(pb); /* add codec info / flavor */
89 rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
90 get_be32(pb); /* ??? */
91 get_be32(pb); /* ??? */
92 get_be32(pb); /* ??? */
93 rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
94 st->codec->block_align= get_be16(pb); /* frame size */
95 rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
96 get_be16(pb); /* ??? */
97 if (((version >> 16) & 0xff) == 5) {
98 get_be16(pb); get_be16(pb); get_be16(pb); }
99 st->codec->sample_rate = get_be16(pb);
101 st->codec->channels = get_be16(pb);
102 if (((version >> 16) & 0xff) == 5) {
104 buf[0] = get_byte(pb);
105 buf[1] = get_byte(pb);
106 buf[2] = get_byte(pb);
107 buf[3] = get_byte(pb);
110 get_str8(pb, buf, sizeof(buf)); /* desc */
111 get_str8(pb, buf, sizeof(buf)); /* desc */
113 st->codec->codec_type = CODEC_TYPE_AUDIO;
114 if (!strcmp(buf, "dnet")) {
115 st->codec->codec_id = CODEC_ID_AC3;
116 st->need_parsing = AVSTREAM_PARSE_FULL;
117 } else if (!strcmp(buf, "28_8")) {
118 st->codec->codec_id = CODEC_ID_RA_288;
119 st->codec->extradata_size= 0;
120 rm->audio_framesize = st->codec->block_align;
121 st->codec->block_align = coded_framesize;
123 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
124 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
128 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
129 } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
130 int codecdata_length, i;
131 get_be16(pb); get_byte(pb);
132 if (((version >> 16) & 0xff) == 5)
134 codecdata_length = get_be32(pb);
135 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
136 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
140 if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
141 else st->codec->codec_id = CODEC_ID_ATRAC3;
142 st->codec->extradata_size= codecdata_length;
143 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
144 for(i = 0; i < codecdata_length; i++)
145 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
146 rm->audio_framesize = st->codec->block_align;
147 st->codec->block_align = rm->sub_packet_size;
149 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
150 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
154 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
155 } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
156 int codecdata_length, i;
157 get_be16(pb); get_byte(pb);
158 if (((version >> 16) & 0xff) == 5)
160 st->codec->codec_id = CODEC_ID_AAC;
161 codecdata_length = get_be32(pb);
162 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
163 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
166 if (codecdata_length >= 1) {
167 st->codec->extradata_size = codecdata_length - 1;
168 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
170 for(i = 0; i < st->codec->extradata_size; i++)
171 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
174 st->codec->codec_id = CODEC_ID_NONE;
175 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
182 get_str8(pb, s->title, sizeof(s->title));
183 get_str8(pb, s->author, sizeof(s->author));
184 get_str8(pb, s->copyright, sizeof(s->copyright));
185 get_str8(pb, s->comment, sizeof(s->comment));
192 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
194 ByteIOContext *pb = &s->pb;
196 int codec_data_size, size;
199 codec_data_size = get_be32(pb);
200 codec_pos = url_ftell(pb);
202 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
204 if (rm_read_audio_stream_info(s, st, 0))
208 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
210 av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
213 st->codec->codec_tag = get_le32(pb);
214 // av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
215 if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
216 && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
217 && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
218 && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
220 st->codec->width = get_be16(pb);
221 st->codec->height = get_be16(pb);
222 st->codec->time_base.num= 1;
224 st->codec->codec_type = CODEC_TYPE_VIDEO;
229 st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
231 if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
232 //check is redundant as get_buffer() will catch this
233 av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
236 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
237 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
239 // av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
240 st->codec->time_base.den = fps * st->codec->time_base.num;
241 switch(((uint8_t*)st->codec->extradata)[4]>>4){
242 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
243 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
244 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
245 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
251 /* skip codec info */
252 size = url_ftell(pb) - codec_pos;
253 url_fskip(pb, codec_data_size - size);
259 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
261 RMContext *rm = s->priv_data;
265 st = av_new_stream(s, 0);
268 return rm_read_audio_stream_info(s, st, 1);
271 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
273 RMContext *rm = s->priv_data;
275 ByteIOContext *pb = &s->pb;
278 unsigned int start_time, duration;
283 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
284 /* very old .ra format */
285 return rm_read_header_old(s, ap);
286 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
290 get_be32(pb); /* header size */
293 get_be32(pb); /* number of headers */
299 tag_size = get_be32(pb);
302 printf("tag=%c%c%c%c (%08x) size=%d\n",
310 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
313 case MKTAG('P', 'R', 'O', 'P'):
315 get_be32(pb); /* max bit rate */
316 get_be32(pb); /* avg bit rate */
317 get_be32(pb); /* max packet size */
318 get_be32(pb); /* avg packet size */
319 get_be32(pb); /* nb packets */
320 get_be32(pb); /* duration */
321 get_be32(pb); /* preroll */
322 get_be32(pb); /* index offset */
323 get_be32(pb); /* data offset */
324 get_be16(pb); /* nb streams */
325 flags = get_be16(pb); /* flags */
327 case MKTAG('C', 'O', 'N', 'T'):
328 get_str16(pb, s->title, sizeof(s->title));
329 get_str16(pb, s->author, sizeof(s->author));
330 get_str16(pb, s->copyright, sizeof(s->copyright));
331 get_str16(pb, s->comment, sizeof(s->comment));
333 case MKTAG('M', 'D', 'P', 'R'):
334 st = av_new_stream(s, 0);
337 st->id = get_be16(pb);
338 get_be32(pb); /* max bit rate */
339 st->codec->bit_rate = get_be32(pb); /* bit rate */
340 get_be32(pb); /* max packet size */
341 get_be32(pb); /* avg packet size */
342 start_time = get_be32(pb); /* start time */
343 get_be32(pb); /* preroll */
344 duration = get_be32(pb); /* duration */
345 st->start_time = start_time;
346 st->duration = duration;
347 get_str8(pb, buf, sizeof(buf)); /* desc */
348 get_str8(pb, buf, sizeof(buf)); /* mimetype */
349 st->codec->codec_type = CODEC_TYPE_DATA;
350 av_set_pts_info(st, 64, 1, 1000);
351 if (ff_rm_read_mdpr_codecdata(s, st) < 0)
354 case MKTAG('D', 'A', 'T', 'A'):
357 /* unknown tag: skip it */
358 url_fskip(pb, tag_size - 10);
363 rm->nb_packets = get_be32(pb); /* number of packets */
364 if (!rm->nb_packets && (flags & 4))
365 rm->nb_packets = 3600 * 25;
366 get_be32(pb); /* next data header */
371 for(i=0;i<s->nb_streams;i++) {
372 av_free(s->streams[i]);
377 static int get_num(ByteIOContext *pb, int *len)
389 return (n << 16) | n1;
393 /* multiple of 20 bytes for ra144 (ugly) */
394 #define RAW_PACKET_SIZE 1000
396 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
397 RMContext *rm = s->priv_data;
398 ByteIOContext *pb = &s->pb;
399 int len, num, res, i;
401 uint32_t state=0xFFFFFFFF;
403 while(!url_feof(pb)){
405 if(rm->remaining_len > 0){
406 num= rm->current_stream;
407 len= rm->remaining_len;
408 *timestamp = AV_NOPTS_VALUE;
411 state= (state<<8) + get_byte(pb);
413 if(state == MKBETAG('I', 'N', 'D', 'X')){
414 len = get_be16(pb) - 6;
420 if(state > (unsigned)0xFFFF || state < 12)
426 *timestamp = get_be32(pb);
427 res= get_byte(pb); /* reserved */
428 *flags = get_byte(pb); /* flags */
433 for(i=0;i<s->nb_streams;i++) {
438 if (i == s->nb_streams) {
440 /* skip packet if unknown number */
442 rm->remaining_len -= len;
452 static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
454 ByteIOContext *pb = &s->pb;
455 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 ssize = len2 + 8*rm->slices + 1;
498 rm->videobuf = av_realloc(rm->videobuf, ssize);
499 rm->videobufsize = ssize;
500 rm->videobufpos = 8*rm->slices + 1;
502 rm->curpic_num = pic_num;
503 rm->pktpos = url_ftell(pb);
506 len = FFMIN(len, pos);
510 if(++rm->cur_slice > rm->cur_slice)
512 AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
513 AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
514 if(rm->videobufpos + len > rm->videobufsize)
516 if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
518 rm->videobufpos += len,
519 rm->remaining_len-= len;
521 if(type == 2 || (rm->videobufpos) == rm->videobufsize){
522 //adjust slice headers
523 memmove(rm->videobuf + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufsize - 1 - 8*rm->slices);
524 ssize = rm->videobufsize - 8*(rm->slices - rm->cur_slice);
526 rm->videobuf[0] = rm->cur_slice-1;
527 if(av_new_packet(pkt, ssize) < 0)
528 return AVERROR(ENOMEM);
529 memcpy(pkt->data, rm->videobuf, ssize);
530 pkt->pts = AV_NOPTS_VALUE;
531 pkt->pos = rm->pktpos;
539 ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
540 int *seq, int *flags, int64_t *timestamp)
542 ByteIOContext *pb = &s->pb;
543 RMContext *rm = s->priv_data;
545 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
546 rm->current_stream= st->id;
547 if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
548 return -1; //got partial frame
549 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
550 if ((st->codec->codec_id == CODEC_ID_RA_288) ||
551 (st->codec->codec_id == CODEC_ID_COOK) ||
552 (st->codec->codec_id == CODEC_ID_ATRAC3)) {
554 int sps = rm->sub_packet_size;
555 int cfs = rm->coded_framesize;
556 int h = rm->sub_packet_h;
557 int y = rm->sub_packet_cnt;
558 int w = rm->audio_framesize;
561 y = rm->sub_packet_cnt = 0;
563 rm->audiotimestamp = *timestamp;
565 switch(st->codec->codec_id) {
566 case CODEC_ID_RA_288:
567 for (x = 0; x < h/2; x++)
568 get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
570 case CODEC_ID_ATRAC3:
572 for (x = 0; x < w/sps; x++)
573 get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
577 if (++(rm->sub_packet_cnt) < h)
580 rm->sub_packet_cnt = 0;
581 rm->audio_stream_num = st->index;
582 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
583 // Release first audio packet
584 av_new_packet(pkt, st->codec->block_align);
585 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
586 *timestamp = rm->audiotimestamp;
587 *flags = 2; // Mark first packet as keyframe
589 } else if (st->codec->codec_id == CODEC_ID_AAC) {
591 rm->audio_stream_num = st->index;
592 rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
593 if (rm->sub_packet_cnt) {
594 for (x = 0; x < rm->sub_packet_cnt; x++)
595 rm->sub_packet_lengths[x] = get_be16(pb);
596 // Release first audio packet
597 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
598 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
599 *flags = 2; // Mark first packet as keyframe
602 av_get_packet(pb, pkt, len);
605 av_get_packet(pb, pkt, len);
607 if( (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
608 || st->discard >= AVDISCARD_ALL){
613 pkt->stream_index = st->index;
616 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
617 if(st->codec->codec_id == CODEC_ID_RV20){
618 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
619 av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
621 seq |= (*timestamp&~0x3FFF);
622 if(seq - *timestamp > 0x2000) seq -= 0x4000;
623 if(seq - *timestamp < -0x2000) seq += 0x4000;
628 pkt->pts= *timestamp;
630 pkt->flags |= PKT_FLAG_KEY;
635 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
637 RMContext *rm = s->priv_data;
638 ByteIOContext *pb = &s->pb;
641 int64_t timestamp, pos;
645 if (rm->audio_pkt_cnt) {
646 // If there are queued audio packet return them first
647 st = s->streams[rm->audio_stream_num];
648 if (st->codec->codec_id == CODEC_ID_AAC)
649 av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
651 av_new_packet(pkt, st->codec->block_align);
652 memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
653 (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
654 st->codec->block_align);
658 pkt->stream_index = rm->audio_stream_num;
659 } else if (rm->old_format) {
661 if (st->codec->codec_id == CODEC_ID_RA_288) {
664 for (y = 0; y < rm->sub_packet_h; y++)
665 for (x = 0; x < rm->sub_packet_h/2; x++)
666 if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
668 rm->audio_stream_num = 0;
669 rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
670 // Release first audio packet
671 av_new_packet(pkt, st->codec->block_align);
672 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
673 pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
674 pkt->stream_index = 0;
676 /* just read raw bytes */
677 len = RAW_PACKET_SIZE;
678 len= av_get_packet(pb, pkt, len);
679 pkt->stream_index = 0;
688 len=sync(s, ×tamp, &flags, &i, &pos);
693 if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, ×tamp) < 0)
698 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
702 /* for AC3, needs to swap bytes */
703 if (st->codec->codec_id == CODEC_ID_AC3) {
705 for(j=0;j<pkt->size;j+=2) {
706 FFSWAP(int, ptr[0], ptr[1]);
713 static int rm_read_close(AVFormatContext *s)
715 RMContext *rm = s->priv_data;
717 av_free(rm->audiobuf);
718 av_free(rm->videobuf);
722 static int rm_probe(AVProbeData *p)
724 /* check file header */
725 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
726 p->buf[2] == 'M' && p->buf[3] == 'F' &&
727 p->buf[4] == 0 && p->buf[5] == 0) ||
728 (p->buf[0] == '.' && p->buf[1] == 'r' &&
729 p->buf[2] == 'a' && p->buf[3] == 0xfd))
730 return AVPROBE_SCORE_MAX;
735 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
736 int64_t *ppos, int64_t pos_limit)
738 RMContext *rm = s->priv_data;
740 int stream_index2, flags, len, h;
745 return AV_NOPTS_VALUE;
747 url_fseek(&s->pb, pos, SEEK_SET);
753 len=sync(s, &dts, &flags, &stream_index2, &pos);
755 return AV_NOPTS_VALUE;
757 st = s->streams[stream_index2];
758 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
759 h= get_byte(&s->pb); len--;
761 seq = get_byte(&s->pb); len--;
765 if((flags&2) && (seq&0x7F) == 1){
766 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
767 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
768 if(stream_index2 == stream_index)
772 url_fskip(&s->pb, len);
778 AVInputFormat rm_demuxer = {