/* * "Real" compatible demuxer. * Copyright (c) 2000, 2001 Fabrice Bellard. * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "rm.h" #include "avstring.h" static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len) { int i; char *q, r; q = buf; for(i=0;i 0) *q = '\0'; } static void get_str16(ByteIOContext *pb, char *buf, int buf_size) { get_strl(pb, buf, buf_size, get_be16(pb)); } static void get_str8(ByteIOContext *pb, char *buf, int buf_size) { get_strl(pb, buf, buf_size, get_byte(pb)); } static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st, int read_all) { RMContext *rm = s->priv_data; ByteIOContext *pb = s->pb; char buf[256]; uint32_t version; int i; /* ra type header */ version = get_be32(pb); /* version */ if (((version >> 16) & 0xff) == 3) { int64_t startpos = url_ftell(pb); /* very old version */ for(i = 0; i < 14; i++) get_byte(pb); get_str8(pb, s->title, sizeof(s->title)); get_str8(pb, s->author, sizeof(s->author)); get_str8(pb, s->copyright, sizeof(s->copyright)); get_str8(pb, s->comment, sizeof(s->comment)); if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) { // fourcc (should always be "lpcJ") get_byte(pb); get_str8(pb, buf, sizeof(buf)); } // Skip extra header crap (this should never happen) if ((startpos + (version & 0xffff)) > url_ftell(pb)) url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb)); st->codec->sample_rate = 8000; st->codec->channels = 1; st->codec->codec_type = CODEC_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_RA_144; } else { int flavor, sub_packet_h, coded_framesize, sub_packet_size; /* old version (4) */ get_be32(pb); /* .ra4 */ get_be32(pb); /* data size */ get_be16(pb); /* version2 */ get_be32(pb); /* header size */ flavor= get_be16(pb); /* add codec info / flavor */ rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */ get_be32(pb); /* ??? */ get_be32(pb); /* ??? */ get_be32(pb); /* ??? */ rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */ st->codec->block_align= get_be16(pb); /* frame size */ rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */ get_be16(pb); /* ??? */ if (((version >> 16) & 0xff) == 5) { get_be16(pb); get_be16(pb); get_be16(pb); } st->codec->sample_rate = get_be16(pb); get_be32(pb); st->codec->channels = get_be16(pb); if (((version >> 16) & 0xff) == 5) { get_be32(pb); buf[0] = get_byte(pb); buf[1] = get_byte(pb); buf[2] = get_byte(pb); buf[3] = get_byte(pb); buf[4] = 0; } else { get_str8(pb, buf, sizeof(buf)); /* desc */ get_str8(pb, buf, sizeof(buf)); /* desc */ } st->codec->codec_type = CODEC_TYPE_AUDIO; if (!strcmp(buf, "dnet")) { st->codec->codec_id = CODEC_ID_AC3; st->need_parsing = AVSTREAM_PARSE_FULL; } else if (!strcmp(buf, "28_8")) { st->codec->codec_id = CODEC_ID_RA_288; st->codec->extradata_size= 0; rm->audio_framesize = st->codec->block_align; st->codec->block_align = coded_framesize; if(rm->audio_framesize >= UINT_MAX / sub_packet_h){ av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n"); return -1; } rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h); } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) { int codecdata_length, i; get_be16(pb); get_byte(pb); if (((version >> 16) & 0xff) == 5) get_byte(pb); codecdata_length = get_be32(pb); if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){ av_log(s, AV_LOG_ERROR, "codecdata_length too large\n"); return -1; } if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK; else st->codec->codec_id = CODEC_ID_ATRAC3; st->codec->extradata_size= codecdata_length; st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); for(i = 0; i < codecdata_length; i++) ((uint8_t*)st->codec->extradata)[i] = get_byte(pb); rm->audio_framesize = st->codec->block_align; st->codec->block_align = rm->sub_packet_size; if(rm->audio_framesize >= UINT_MAX / sub_packet_h){ av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n"); return -1; } rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h); } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) { int codecdata_length, i; get_be16(pb); get_byte(pb); if (((version >> 16) & 0xff) == 5) get_byte(pb); st->codec->codec_id = CODEC_ID_AAC; codecdata_length = get_be32(pb); if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){ av_log(s, AV_LOG_ERROR, "codecdata_length too large\n"); return -1; } if (codecdata_length >= 1) { st->codec->extradata_size = codecdata_length - 1; st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); get_byte(pb); for(i = 0; i < st->codec->extradata_size; i++) ((uint8_t*)st->codec->extradata)[i] = get_byte(pb); } } else { st->codec->codec_id = CODEC_ID_NONE; av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name)); } if (read_all) { get_byte(pb); get_byte(pb); get_byte(pb); get_str8(pb, s->title, sizeof(s->title)); get_str8(pb, s->author, sizeof(s->author)); get_str8(pb, s->copyright, sizeof(s->copyright)); get_str8(pb, s->comment, sizeof(s->comment)); } } return 0; } static int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st) { ByteIOContext *pb = s->pb; unsigned int v; int codec_data_size, size; int64_t codec_pos; codec_data_size = get_be32(pb); codec_pos = url_ftell(pb); v = get_be32(pb); if (v == MKTAG(0xfd, 'a', 'r', '.')) { /* ra type header */ if (rm_read_audio_stream_info(s, st, 0)) return -1; } else { int fps, fps2; if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) { fail1: av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n"); goto skip; } st->codec->codec_tag = get_le32(pb); // av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0')); if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0') && st->codec->codec_tag != MKTAG('R', 'V', '2', '0') && st->codec->codec_tag != MKTAG('R', 'V', '3', '0') && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')) goto fail1; st->codec->width = get_be16(pb); st->codec->height = get_be16(pb); st->codec->time_base.num= 1; fps= get_be16(pb); st->codec->codec_type = CODEC_TYPE_VIDEO; get_be32(pb); fps2= get_be16(pb); get_be16(pb); st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos); if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ //check is redundant as get_buffer() will catch this av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n"); return -1; } st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); get_buffer(pb, st->codec->extradata, st->codec->extradata_size); // av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2); st->codec->time_base.den = fps * st->codec->time_base.num; switch(((uint8_t*)st->codec->extradata)[4]>>4){ case 1: st->codec->codec_id = CODEC_ID_RV10; break; case 2: st->codec->codec_id = CODEC_ID_RV20; break; case 3: st->codec->codec_id = CODEC_ID_RV30; break; case 4: st->codec->codec_id = CODEC_ID_RV40; break; default: goto fail1; } } skip: /* skip codec info */ size = url_ftell(pb) - codec_pos; url_fskip(pb, codec_data_size - size); return 0; } static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap) { RMContext *rm = s->priv_data; AVStream *st; rm->old_format = 1; st = av_new_stream(s, 0); if (!st) return -1; return rm_read_audio_stream_info(s, st, 1); } static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap) { RMContext *rm = s->priv_data; AVStream *st; ByteIOContext *pb = s->pb; unsigned int tag; int tag_size, i; unsigned int start_time, duration; char buf[128]; int flags = 0; tag = get_le32(pb); if (tag == MKTAG('.', 'r', 'a', 0xfd)) { /* very old .ra format */ return rm_read_header_old(s, ap); } else if (tag != MKTAG('.', 'R', 'M', 'F')) { return AVERROR(EIO); } get_be32(pb); /* header size */ get_be16(pb); get_be32(pb); get_be32(pb); /* number of headers */ for(;;) { if (url_feof(pb)) goto fail; tag = get_le32(pb); tag_size = get_be32(pb); get_be16(pb); #if 0 printf("tag=%c%c%c%c (%08x) size=%d\n", (tag) & 0xff, (tag >> 8) & 0xff, (tag >> 16) & 0xff, (tag >> 24) & 0xff, tag, tag_size); #endif if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A')) goto fail; switch(tag) { case MKTAG('P', 'R', 'O', 'P'): /* file header */ get_be32(pb); /* max bit rate */ get_be32(pb); /* avg bit rate */ get_be32(pb); /* max packet size */ get_be32(pb); /* avg packet size */ get_be32(pb); /* nb packets */ get_be32(pb); /* duration */ get_be32(pb); /* preroll */ get_be32(pb); /* index offset */ get_be32(pb); /* data offset */ get_be16(pb); /* nb streams */ flags = get_be16(pb); /* flags */ break; case MKTAG('C', 'O', 'N', 'T'): get_str16(pb, s->title, sizeof(s->title)); get_str16(pb, s->author, sizeof(s->author)); get_str16(pb, s->copyright, sizeof(s->copyright)); get_str16(pb, s->comment, sizeof(s->comment)); break; case MKTAG('M', 'D', 'P', 'R'): st = av_new_stream(s, 0); if (!st) goto fail; st->id = get_be16(pb); get_be32(pb); /* max bit rate */ st->codec->bit_rate = get_be32(pb); /* bit rate */ get_be32(pb); /* max packet size */ get_be32(pb); /* avg packet size */ start_time = get_be32(pb); /* start time */ get_be32(pb); /* preroll */ duration = get_be32(pb); /* duration */ st->start_time = start_time; st->duration = duration; get_str8(pb, buf, sizeof(buf)); /* desc */ get_str8(pb, buf, sizeof(buf)); /* mimetype */ st->codec->codec_type = CODEC_TYPE_DATA; av_set_pts_info(st, 64, 1, 1000); if (ff_rm_read_mdpr_codecdata(s, st) < 0) return -1; break; case MKTAG('D', 'A', 'T', 'A'): goto header_end; default: /* unknown tag: skip it */ url_fskip(pb, tag_size - 10); break; } } header_end: rm->nb_packets = get_be32(pb); /* number of packets */ if (!rm->nb_packets && (flags & 4)) rm->nb_packets = 3600 * 25; get_be32(pb); /* next data header */ rm->curpic_num = -1; return 0; fail: for(i=0;inb_streams;i++) { av_free(s->streams[i]); } return AVERROR(EIO); } static int get_num(ByteIOContext *pb, int *len) { int n, n1; n = get_be16(pb); (*len)-=2; n &= 0x7FFF; if (n >= 0x4000) { return n - 0x4000; } else { n1 = get_be16(pb); (*len)-=2; return (n << 16) | n1; } } /* multiple of 20 bytes for ra144 (ugly) */ #define RAW_PACKET_SIZE 1000 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){ RMContext *rm = s->priv_data; ByteIOContext *pb = s->pb; int len, num, res, i; AVStream *st; uint32_t state=0xFFFFFFFF; while(!url_feof(pb)){ *pos= url_ftell(pb); if(rm->remaining_len > 0){ num= rm->current_stream; len= rm->remaining_len; *timestamp = AV_NOPTS_VALUE; *flags= 0; }else{ state= (state<<8) + get_byte(pb); if(state == MKBETAG('I', 'N', 'D', 'X')){ len = get_be16(pb) - 6; if(len<0) continue; goto skip; } if(state > (unsigned)0xFFFF || state < 12) continue; len=state; state= 0xFFFFFFFF; num = get_be16(pb); *timestamp = get_be32(pb); res= get_byte(pb); /* reserved */ *flags = get_byte(pb); /* flags */ len -= 12; } for(i=0;inb_streams;i++) { st = s->streams[i]; if (num == st->id) break; } if (i == s->nb_streams) { skip: /* skip packet if unknown number */ url_fskip(pb, len); rm->remaining_len -= len; continue; } *stream_index= i; return len; } return -1; } static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len) { ByteIOContext *pb = s->pb; int hdr, seq, pic_num, len2, pos; int type; hdr = get_byte(pb); len--; type = hdr >> 6; switch(type){ case 0: // slice case 2: // last slice seq = get_byte(pb); len--; len2 = get_num(pb, &len); pos = get_num(pb, &len); pic_num = get_byte(pb); len--; rm->remaining_len = len; break; case 1: //whole frame seq = get_byte(pb); len--; if(av_new_packet(pkt, len + 9) < 0) return AVERROR(EIO); pkt->data[0] = 0; AV_WL32(pkt->data + 1, 1); AV_WL32(pkt->data + 5, 0); get_buffer(pb, pkt->data + 9, len); rm->remaining_len = 0; return 0; case 3: //frame as a part of packet len2 = get_num(pb, &len); pos = get_num(pb, &len); pic_num = get_byte(pb); len--; rm->remaining_len = len - len2; if(av_new_packet(pkt, len2 + 9) < 0) return AVERROR(EIO); pkt->data[0] = 0; AV_WL32(pkt->data + 1, 1); AV_WL32(pkt->data + 5, 0); get_buffer(pb, pkt->data + 9, len2); return 0; } //now we have to deal with single slice if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){ rm->slices = ((hdr & 0x3F) << 1) + 1; rm->videobufsize = len2 + 8*rm->slices + 1; av_free(rm->videobuf); if(!(rm->videobuf = av_malloc(rm->videobufsize))) return AVERROR(ENOMEM); rm->videobufpos = 8*rm->slices + 1; rm->cur_slice = 0; rm->curpic_num = pic_num; rm->pktpos = url_ftell(pb); } if(type == 2) len = FFMIN(len, pos); if(++rm->cur_slice > rm->slices) return 1; AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1); AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1); if(rm->videobufpos + len > rm->videobufsize) return 1; if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len) return AVERROR(EIO); rm->videobufpos += len; rm->remaining_len-= len; if(type == 2 || (rm->videobufpos) == rm->videobufsize){ rm->videobuf[0] = rm->cur_slice-1; if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0) return AVERROR(ENOMEM); memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice); memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices, rm->videobufpos - 1 - 8*rm->slices); pkt->pts = AV_NOPTS_VALUE; pkt->pos = rm->pktpos; return 0; } return 1; } static inline void rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt) { uint8_t *ptr; int j; if (st->codec->codec_id == CODEC_ID_AC3) { ptr = pkt->data; for (j=0;jsize;j+=2) { FFSWAP(int, ptr[0], ptr[1]); ptr += 2; } } } static int ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt, int *seq, int *flags, int64_t *timestamp) { ByteIOContext *pb = s->pb; RMContext *rm = s->priv_data; if (st->codec->codec_type == CODEC_TYPE_VIDEO) { rm->current_stream= st->id; if(rm_assemble_video_frame(s, rm, pkt, len) == 1) return -1; //got partial frame } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) { if ((st->codec->codec_id == CODEC_ID_RA_288) || (st->codec->codec_id == CODEC_ID_COOK) || (st->codec->codec_id == CODEC_ID_ATRAC3)) { int x; int sps = rm->sub_packet_size; int cfs = rm->coded_framesize; int h = rm->sub_packet_h; int y = rm->sub_packet_cnt; int w = rm->audio_framesize; if (*flags & 2) y = rm->sub_packet_cnt = 0; if (!y) rm->audiotimestamp = *timestamp; switch(st->codec->codec_id) { case CODEC_ID_RA_288: for (x = 0; x < h/2; x++) get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs); break; case CODEC_ID_ATRAC3: case CODEC_ID_COOK: for (x = 0; x < w/sps; x++) get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps); break; } if (++(rm->sub_packet_cnt) < h) return -1; else { rm->sub_packet_cnt = 0; rm->audio_stream_num = st->index; rm->audio_pkt_cnt = h * w / st->codec->block_align - 1; // Release first audio packet av_new_packet(pkt, st->codec->block_align); memcpy(pkt->data, rm->audiobuf, st->codec->block_align); *timestamp = rm->audiotimestamp; *flags = 2; // Mark first packet as keyframe } } else if (st->codec->codec_id == CODEC_ID_AAC) { int x; rm->audio_stream_num = st->index; rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4; if (rm->sub_packet_cnt) { for (x = 0; x < rm->sub_packet_cnt; x++) rm->sub_packet_lengths[x] = get_be16(pb); // Release first audio packet rm->audio_pkt_cnt = rm->sub_packet_cnt - 1; av_get_packet(pb, pkt, rm->sub_packet_lengths[0]); *flags = 2; // Mark first packet as keyframe } } else av_get_packet(pb, pkt, len); rm_ac3_swap_bytes(st, pkt); } else av_get_packet(pb, pkt, len); if( (st->discard >= AVDISCARD_NONKEY && !(*flags&2)) || st->discard >= AVDISCARD_ALL){ av_free_packet(pkt); return -1; } pkt->stream_index = st->index; #if 0 if (st->codec->codec_type == CODEC_TYPE_VIDEO) { if(st->codec->codec_id == CODEC_ID_RV20){ int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1); av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq); seq |= (*timestamp&~0x3FFF); if(seq - *timestamp > 0x2000) seq -= 0x4000; if(seq - *timestamp < -0x2000) seq += 0x4000; } } #endif pkt->pts= *timestamp; if (*flags & 2) pkt->flags |= PKT_FLAG_KEY; return 0; } static void ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt) { ByteIOContext *pb = s->pb; RMContext *rm = s->priv_data; assert (rm->audio_pkt_cnt > 0); if (st->codec->codec_id == CODEC_ID_AAC) av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]); else { av_new_packet(pkt, st->codec->block_align); memcpy(pkt->data, rm->audiobuf + st->codec->block_align * (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt), st->codec->block_align); } rm->audio_pkt_cnt--; pkt->flags = 0; pkt->stream_index = st->index; } static int rm_read_packet(AVFormatContext *s, AVPacket *pkt) { RMContext *rm = s->priv_data; ByteIOContext *pb = s->pb; AVStream *st; int i, len; int64_t timestamp, pos; int flags; if (rm->audio_pkt_cnt) { // If there are queued audio packet return them first st = s->streams[rm->audio_stream_num]; ff_rm_retrieve_cache(s, st, pkt); } else if (rm->old_format) { st = s->streams[0]; if (st->codec->codec_id == CODEC_ID_RA_288) { int x, y; for (y = 0; y < rm->sub_packet_h; y++) for (x = 0; x < rm->sub_packet_h/2; x++) if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0) return AVERROR(EIO); rm->audio_stream_num = 0; rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1; // Release first audio packet av_new_packet(pkt, st->codec->block_align); memcpy(pkt->data, rm->audiobuf, st->codec->block_align); pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe pkt->stream_index = 0; } else { /* just read raw bytes */ len = RAW_PACKET_SIZE; len= av_get_packet(pb, pkt, len); pkt->stream_index = 0; if (len <= 0) { return AVERROR(EIO); } pkt->size = len; } rm_ac3_swap_bytes(st, pkt); } else { int seq=1; resync: len=sync(s, ×tamp, &flags, &i, &pos); if(len<0) return AVERROR(EIO); st = s->streams[i]; if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, ×tamp) < 0) goto resync; if(flags&2 && (seq&0x7F) == 1) av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME); } return 0; } static int rm_read_close(AVFormatContext *s) { RMContext *rm = s->priv_data; av_free(rm->audiobuf); av_free(rm->videobuf); return 0; } static int rm_probe(AVProbeData *p) { /* check file header */ if ((p->buf[0] == '.' && p->buf[1] == 'R' && p->buf[2] == 'M' && p->buf[3] == 'F' && p->buf[4] == 0 && p->buf[5] == 0) || (p->buf[0] == '.' && p->buf[1] == 'r' && p->buf[2] == 'a' && p->buf[3] == 0xfd)) return AVPROBE_SCORE_MAX; else return 0; } static int64_t rm_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit) { RMContext *rm = s->priv_data; int64_t pos, dts; int stream_index2, flags, len, h; pos = *ppos; if(rm->old_format) return AV_NOPTS_VALUE; url_fseek(s->pb, pos, SEEK_SET); rm->remaining_len=0; for(;;){ int seq=1; AVStream *st; len=sync(s, &dts, &flags, &stream_index2, &pos); if(len<0) return AV_NOPTS_VALUE; st = s->streams[stream_index2]; if (st->codec->codec_type == CODEC_TYPE_VIDEO) { h= get_byte(s->pb); len--; if(!(h & 0x40)){ seq = get_byte(s->pb); len--; } } if((flags&2) && (seq&0x7F) == 1){ // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq); av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME); if(stream_index2 == stream_index) break; } url_fskip(s->pb, len); } *ppos = pos; return dts; } AVInputFormat rm_demuxer = { "rm", "rm format", sizeof(RMContext), rm_probe, rm_read_header, rm_read_packet, rm_read_close, NULL, rm_read_dts, };