692 lines
23 KiB
C
692 lines
23 KiB
C
/*
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* "Real" compatible demuxer.
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* Copyright (c) 2000, 2001 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "rm.h"
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#include "avstring.h"
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static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
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{
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int i;
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char *q, r;
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q = buf;
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for(i=0;i<len;i++) {
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r = get_byte(pb);
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if (i < buf_size - 1)
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*q++ = r;
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}
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if (buf_size > 0) *q = '\0';
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}
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static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
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{
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get_strl(pb, buf, buf_size, get_be16(pb));
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}
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static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
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{
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get_strl(pb, buf, buf_size, get_byte(pb));
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}
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static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
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int read_all)
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{
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RMContext *rm = s->priv_data;
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ByteIOContext *pb = &s->pb;
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char buf[256];
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uint32_t version;
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int i;
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/* ra type header */
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version = get_be32(pb); /* version */
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if (((version >> 16) & 0xff) == 3) {
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int64_t startpos = url_ftell(pb);
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/* very old version */
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for(i = 0; i < 14; i++)
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get_byte(pb);
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get_str8(pb, s->title, sizeof(s->title));
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get_str8(pb, s->author, sizeof(s->author));
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get_str8(pb, s->copyright, sizeof(s->copyright));
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get_str8(pb, s->comment, sizeof(s->comment));
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if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
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// fourcc (should always be "lpcJ")
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get_byte(pb);
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get_str8(pb, buf, sizeof(buf));
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}
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// Skip extra header crap (this should never happen)
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if ((startpos + (version & 0xffff)) > url_ftell(pb))
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url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
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st->codec->sample_rate = 8000;
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st->codec->channels = 1;
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_RA_144;
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} else {
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int flavor, sub_packet_h, coded_framesize, sub_packet_size;
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/* old version (4) */
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get_be32(pb); /* .ra4 */
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get_be32(pb); /* data size */
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get_be16(pb); /* version2 */
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get_be32(pb); /* header size */
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flavor= get_be16(pb); /* add codec info / flavor */
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rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
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get_be32(pb); /* ??? */
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get_be32(pb); /* ??? */
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get_be32(pb); /* ??? */
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rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
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st->codec->block_align= get_be16(pb); /* frame size */
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rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
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get_be16(pb); /* ??? */
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if (((version >> 16) & 0xff) == 5) {
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get_be16(pb); get_be16(pb); get_be16(pb); }
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st->codec->sample_rate = get_be16(pb);
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get_be32(pb);
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st->codec->channels = get_be16(pb);
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if (((version >> 16) & 0xff) == 5) {
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get_be32(pb);
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buf[0] = get_byte(pb);
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buf[1] = get_byte(pb);
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buf[2] = get_byte(pb);
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buf[3] = get_byte(pb);
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buf[4] = 0;
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} else {
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get_str8(pb, buf, sizeof(buf)); /* desc */
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get_str8(pb, buf, sizeof(buf)); /* desc */
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}
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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if (!strcmp(buf, "dnet")) {
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st->codec->codec_id = CODEC_ID_AC3;
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} else if (!strcmp(buf, "28_8")) {
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st->codec->codec_id = CODEC_ID_RA_288;
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st->codec->extradata_size= 0;
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rm->audio_framesize = st->codec->block_align;
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st->codec->block_align = coded_framesize;
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if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
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av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
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return -1;
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}
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rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
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} else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
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int codecdata_length, i;
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get_be16(pb); get_byte(pb);
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if (((version >> 16) & 0xff) == 5)
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get_byte(pb);
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codecdata_length = get_be32(pb);
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if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
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av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
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return -1;
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}
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if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
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else st->codec->codec_id = CODEC_ID_ATRAC3;
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st->codec->extradata_size= codecdata_length;
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st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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for(i = 0; i < codecdata_length; i++)
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((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
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rm->audio_framesize = st->codec->block_align;
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st->codec->block_align = rm->sub_packet_size;
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if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
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av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
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return -1;
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}
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rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
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} else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
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int codecdata_length, i;
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get_be16(pb); get_byte(pb);
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if (((version >> 16) & 0xff) == 5)
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get_byte(pb);
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st->codec->codec_id = CODEC_ID_AAC;
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codecdata_length = get_be32(pb);
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if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
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av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
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return -1;
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}
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if (codecdata_length >= 1) {
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st->codec->extradata_size = codecdata_length - 1;
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st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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get_byte(pb);
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for(i = 0; i < st->codec->extradata_size; i++)
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((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
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}
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} else {
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st->codec->codec_id = CODEC_ID_NONE;
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av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
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}
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if (read_all) {
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get_byte(pb);
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get_byte(pb);
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get_byte(pb);
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get_str8(pb, s->title, sizeof(s->title));
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get_str8(pb, s->author, sizeof(s->author));
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get_str8(pb, s->copyright, sizeof(s->copyright));
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get_str8(pb, s->comment, sizeof(s->comment));
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}
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}
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return 0;
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}
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static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
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{
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RMContext *rm = s->priv_data;
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AVStream *st;
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rm->old_format = 1;
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st = av_new_stream(s, 0);
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if (!st)
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return -1;
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return rm_read_audio_stream_info(s, st, 1);
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}
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static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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RMContext *rm = s->priv_data;
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AVStream *st;
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ByteIOContext *pb = &s->pb;
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unsigned int tag, v;
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int tag_size, size, codec_data_size, i;
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int64_t codec_pos;
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unsigned int start_time, duration;
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char buf[128];
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int flags = 0;
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tag = get_le32(pb);
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if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
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/* very old .ra format */
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return rm_read_header_old(s, ap);
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} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
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return AVERROR(EIO);
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}
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get_be32(pb); /* header size */
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get_be16(pb);
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get_be32(pb);
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get_be32(pb); /* number of headers */
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for(;;) {
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if (url_feof(pb))
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goto fail;
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tag = get_le32(pb);
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tag_size = get_be32(pb);
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get_be16(pb);
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#if 0
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printf("tag=%c%c%c%c (%08x) size=%d\n",
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(tag) & 0xff,
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(tag >> 8) & 0xff,
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(tag >> 16) & 0xff,
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(tag >> 24) & 0xff,
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tag,
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tag_size);
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#endif
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if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
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goto fail;
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switch(tag) {
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case MKTAG('P', 'R', 'O', 'P'):
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/* file header */
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get_be32(pb); /* max bit rate */
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get_be32(pb); /* avg bit rate */
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get_be32(pb); /* max packet size */
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get_be32(pb); /* avg packet size */
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get_be32(pb); /* nb packets */
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get_be32(pb); /* duration */
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get_be32(pb); /* preroll */
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get_be32(pb); /* index offset */
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get_be32(pb); /* data offset */
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get_be16(pb); /* nb streams */
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flags = get_be16(pb); /* flags */
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break;
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case MKTAG('C', 'O', 'N', 'T'):
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get_str16(pb, s->title, sizeof(s->title));
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get_str16(pb, s->author, sizeof(s->author));
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get_str16(pb, s->copyright, sizeof(s->copyright));
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get_str16(pb, s->comment, sizeof(s->comment));
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break;
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case MKTAG('M', 'D', 'P', 'R'):
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st = av_new_stream(s, 0);
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if (!st)
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goto fail;
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st->id = get_be16(pb);
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get_be32(pb); /* max bit rate */
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st->codec->bit_rate = get_be32(pb); /* bit rate */
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get_be32(pb); /* max packet size */
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get_be32(pb); /* avg packet size */
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start_time = get_be32(pb); /* start time */
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get_be32(pb); /* preroll */
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duration = get_be32(pb); /* duration */
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st->start_time = start_time;
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st->duration = duration;
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get_str8(pb, buf, sizeof(buf)); /* desc */
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get_str8(pb, buf, sizeof(buf)); /* mimetype */
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codec_data_size = get_be32(pb);
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codec_pos = url_ftell(pb);
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st->codec->codec_type = CODEC_TYPE_DATA;
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av_set_pts_info(st, 64, 1, 1000);
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v = get_be32(pb);
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if (v == MKTAG(0xfd, 'a', 'r', '.')) {
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/* ra type header */
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if (rm_read_audio_stream_info(s, st, 0))
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return -1;
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} else {
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int fps, fps2;
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if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
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fail1:
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av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
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goto skip;
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}
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st->codec->codec_tag = get_le32(pb);
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// av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
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if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
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&& st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
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&& st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
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&& st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
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goto fail1;
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st->codec->width = get_be16(pb);
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st->codec->height = get_be16(pb);
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st->codec->time_base.num= 1;
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fps= get_be16(pb);
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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get_be32(pb);
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fps2= get_be16(pb);
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get_be16(pb);
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st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
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if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
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//check is redundant as get_buffer() will catch this
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av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
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return -1;
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}
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st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
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// av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
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st->codec->time_base.den = fps * st->codec->time_base.num;
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switch(((uint8_t*)st->codec->extradata)[4]>>4){
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case 1: st->codec->codec_id = CODEC_ID_RV10; break;
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case 2: st->codec->codec_id = CODEC_ID_RV20; break;
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case 3: st->codec->codec_id = CODEC_ID_RV30; break;
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case 4: st->codec->codec_id = CODEC_ID_RV40; break;
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default: goto fail1;
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}
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}
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skip:
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/* skip codec info */
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size = url_ftell(pb) - codec_pos;
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url_fskip(pb, codec_data_size - size);
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break;
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case MKTAG('D', 'A', 'T', 'A'):
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goto header_end;
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default:
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/* unknown tag: skip it */
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url_fskip(pb, tag_size - 10);
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break;
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}
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}
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header_end:
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rm->nb_packets = get_be32(pb); /* number of packets */
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if (!rm->nb_packets && (flags & 4))
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rm->nb_packets = 3600 * 25;
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get_be32(pb); /* next data header */
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return 0;
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fail:
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for(i=0;i<s->nb_streams;i++) {
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av_free(s->streams[i]);
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}
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return AVERROR(EIO);
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}
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static int get_num(ByteIOContext *pb, int *len)
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{
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int n, n1;
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n = get_be16(pb);
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(*len)-=2;
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if (n >= 0x4000) {
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return n - 0x4000;
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} else {
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n1 = get_be16(pb);
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(*len)-=2;
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return (n << 16) | n1;
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}
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}
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/* multiple of 20 bytes for ra144 (ugly) */
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#define RAW_PACKET_SIZE 1000
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static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
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RMContext *rm = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int len, num, res, i;
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AVStream *st;
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uint32_t state=0xFFFFFFFF;
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while(!url_feof(pb)){
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*pos= url_ftell(pb);
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if(rm->remaining_len > 0){
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num= rm->current_stream;
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len= rm->remaining_len;
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*timestamp = AV_NOPTS_VALUE;
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*flags= 0;
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}else{
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state= (state<<8) + get_byte(pb);
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if(state == MKBETAG('I', 'N', 'D', 'X')){
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len = get_be16(pb) - 6;
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if(len<0)
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continue;
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goto skip;
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}
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if(state > (unsigned)0xFFFF || state < 12)
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continue;
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len=state;
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state= 0xFFFFFFFF;
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num = get_be16(pb);
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*timestamp = get_be32(pb);
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res= get_byte(pb); /* reserved */
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*flags = get_byte(pb); /* flags */
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len -= 12;
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}
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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if (num == st->id)
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break;
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}
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if (i == s->nb_streams) {
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skip:
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/* skip packet if unknown number */
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url_fskip(pb, len);
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rm->remaining_len -= len;
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continue;
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}
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*stream_index= i;
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return len;
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}
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return -1;
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}
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static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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RMContext *rm = s->priv_data;
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ByteIOContext *pb = &s->pb;
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AVStream *st;
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int i, len, j;
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int64_t timestamp, pos;
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uint8_t *ptr;
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int flags;
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if (rm->audio_pkt_cnt) {
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// If there are queued audio packet return them first
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st = s->streams[rm->audio_stream_num];
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if (st->codec->codec_id == CODEC_ID_AAC)
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av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
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else {
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av_new_packet(pkt, st->codec->block_align);
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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 = rm->audio_stream_num;
|
|
} 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;
|
|
}
|
|
} else {
|
|
int seq=1;
|
|
resync:
|
|
len=sync(s, ×tamp, &flags, &i, &pos);
|
|
if(len<0)
|
|
return AVERROR(EIO);
|
|
st = s->streams[i];
|
|
|
|
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
|
int h, pic_num, len2, pos;
|
|
|
|
h= get_byte(pb); len--;
|
|
if(!(h & 0x40)){
|
|
seq = get_byte(pb); len--;
|
|
}
|
|
|
|
if((h & 0xc0) == 0x40){
|
|
len2= pos= 0;
|
|
}else{
|
|
len2 = get_num(pb, &len);
|
|
pos = get_num(pb, &len);
|
|
}
|
|
/* picture number */
|
|
pic_num= get_byte(pb); len--;
|
|
rm->remaining_len= len;
|
|
rm->current_stream= st->id;
|
|
|
|
// av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);
|
|
if((h & 0xc0) == 0x80)
|
|
len=pos;
|
|
if(len2 && len2<len)
|
|
len=len2;
|
|
rm->remaining_len-= len;
|
|
av_get_packet(pb, pkt, len);
|
|
|
|
} 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)
|
|
goto resync;
|
|
else {
|
|
rm->sub_packet_cnt = 0;
|
|
rm->audio_stream_num = i;
|
|
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 = i;
|
|
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);
|
|
|
|
} else
|
|
av_get_packet(pb, pkt, len);
|
|
|
|
if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
|
|
|| st->discard >= AVDISCARD_ALL){
|
|
av_free_packet(pkt);
|
|
goto resync;
|
|
}
|
|
|
|
pkt->stream_index = i;
|
|
|
|
#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;
|
|
if((seq&0x7F) == 1)
|
|
av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
|
|
/* for AC3, needs to swap bytes */
|
|
if (st->codec->codec_id == CODEC_ID_AC3) {
|
|
ptr = pkt->data;
|
|
for(j=0;j<pkt->size;j+=2) {
|
|
FFSWAP(int, ptr[0], ptr[1]);
|
|
ptr += 2;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rm_read_close(AVFormatContext *s)
|
|
{
|
|
RMContext *rm = s->priv_data;
|
|
|
|
av_free(rm->audiobuf);
|
|
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,
|
|
};
|