[libav.git] / libavformat / flvdec.c

/*
 * FLV demuxer
 * Copyright (c) 2003 The FFmpeg Project.
 *
 * 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
 *
 *
 * This demuxer will generate a 1 byte extradata for VP6F content.
 * It is composed of:
 *  - upper 4bits: difference between encoded width and visible width
 *  - lower 4bits: difference between encoded height and visible height
 */
#include "avformat.h"
#include "flv.h"

static int flv_probe(AVProbeData *p)
{
    const uint8_t *d;

    if (p->buf_size < 6)
        return 0;
    d = p->buf;
    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
        return 50;
    }
    return 0;
}

static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
    int length = get_be16(ioc);
    if(length >= buffsize) {
        url_fskip(ioc, length);
        return -1;
    }

    get_buffer(ioc, buffer, length);

    buffer[length] = '\0';

    return length;
}

static int flv_read_header(AVFormatContext *s,
                           AVFormatParameters *ap)
{
    int offset, flags;
    AVStream *st;

    url_fskip(&s->pb, 4);
    flags = get_byte(&s->pb);

    if(flags & FLV_HEADER_FLAG_HASVIDEO){
        st = av_new_stream(s, 0);
        if (!st)
            return AVERROR_NOMEM;
        st->codec->codec_type = CODEC_TYPE_VIDEO;
        av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
    }
    if(flags & FLV_HEADER_FLAG_HASAUDIO){
        st = av_new_stream(s, 1);
        if (!st)
            return AVERROR_NOMEM;
        st->codec->codec_type = CODEC_TYPE_AUDIO;
        av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
    }

    offset = get_be32(&s->pb);
    url_fseek(&s->pb, offset, SEEK_SET);

    s->start_time = 0;

    return 0;
}

static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret, i, type, size, pts, flags, is_audio, next, pos;
    AVStream *st = NULL;

 for(;;){
    pos = url_ftell(&s->pb);
    url_fskip(&s->pb, 4); /* size of previous packet */
    type = get_byte(&s->pb);
    size = get_be24(&s->pb);
    pts = get_be24(&s->pb);
//    av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
    if (url_feof(&s->pb))
        return AVERROR_IO;
    url_fskip(&s->pb, 4); /* reserved */
    flags = 0;

    if(size == 0)
        continue;

    next= size + url_ftell(&s->pb);

    if (type == FLV_TAG_TYPE_AUDIO) {
        is_audio=1;
        flags = get_byte(&s->pb);
    } else if (type == FLV_TAG_TYPE_VIDEO) {
        is_audio=0;
        flags = get_byte(&s->pb);
    } else if (type == FLV_TAG_TYPE_META && size > 13+1+4) {
        url_fskip(&s->pb, 13); //onMetaData blah
        if(get_byte(&s->pb) == 8){
            url_fskip(&s->pb, 4);
        }
        while(url_ftell(&s->pb) + 5 < next){
            char tmp[128];
            int type, len;
            double d= 0;

            if(amf_get_string(&s->pb, tmp, sizeof(tmp))<0)
                break;

            type= get_byte(&s->pb);
            if(type == AMF_DATA_TYPE_NUMBER){
                d= av_int2dbl(get_be64(&s->pb));
            }else if(type == AMF_DATA_TYPE_STRING){
                amf_get_string(&s->pb, NULL, 0);
            }else if(type == AMF_DATA_TYPE_MIXEDARRAY){
                //array
                break;
            }else if(type == AMF_DATA_TYPE_DATE){
                d= av_int2dbl(get_be64(&s->pb));
                get_be16(&s->pb);
            }

            if(!strcmp(tmp, "duration")){
                s->duration = d*AV_TIME_BASE;
            }else if(!strcmp(tmp, "videodatarate")){
            }else if(!strcmp(tmp, "audiodatarate")){
            }
        }
        url_fseek(&s->pb, next, SEEK_SET);
        continue;
    } else {
        /* skip packet */
        av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
        url_fseek(&s->pb, next, SEEK_SET);
        continue;
    }

    /* now find stream */
    for(i=0;i<s->nb_streams;i++) {
        st = s->streams[i];
        if (st->id == is_audio)
            break;
    }
    if(i == s->nb_streams){
        av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
        url_fseek(&s->pb, next, SEEK_SET);
        continue;
    }
//    av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
    if(  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||         is_audio))
       ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
       || st->discard >= AVDISCARD_ALL
       ){
        url_fseek(&s->pb, next, SEEK_SET);
        continue;
    }
    if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
        av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
    break;
 }

    // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
    if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
        int size;
        const int pos= url_ftell(&s->pb);
        const int fsize= url_fsize(&s->pb);
        url_fseek(&s->pb, fsize-4, SEEK_SET);
        size= get_be32(&s->pb);
        url_fseek(&s->pb, fsize-3-size, SEEK_SET);
        if(size == get_be24(&s->pb) + 11){
            s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
        }
        url_fseek(&s->pb, pos, SEEK_SET);
    }

    if(is_audio){
        if(st->codec->sample_rate == 0){
            st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
            if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
                st->codec->sample_rate= 8000;
            else
                st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
            switch(flags & FLV_AUDIO_CODECID_MASK) {
            case FLV_CODECID_PCM_BE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16BE;
                    else st->codec->codec_id = CODEC_ID_PCM_S8; break;
            case FLV_CODECID_ADPCM : st->codec->codec_id = CODEC_ID_ADPCM_SWF;                       break;
            case FLV_CODECID_MP3   : st->codec->codec_id = CODEC_ID_MP3      ; st->need_parsing = 1; break;
            // this is not listed at FLV but at SWF, strange...
            case FLV_CODECID_PCM_LE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16LE;
                    else st->codec->codec_id = CODEC_ID_PCM_S8; break;
            default:
                    av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
                st->codec->codec_tag= (flags >> 4);
            }
            st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
        }
    }else{
            switch(flags & FLV_VIDEO_CODECID_MASK){
            case FLV_CODECID_H263  : st->codec->codec_id = CODEC_ID_FLV1   ; break;
            case FLV_CODECID_SCREEN: st->codec->codec_id = CODEC_ID_FLASHSV; break;
            case FLV_CODECID_VP6   :
                st->codec->codec_id = CODEC_ID_VP6F;
                if (st->codec->extradata_size != 1) {
                    st->codec->extradata_size = 1;
                    st->codec->extradata = av_malloc(1);
                }
                /* width and height adjustment */
                st->codec->extradata[0] = get_byte(&s->pb);
                size--;
                break;
            default:
                av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & FLV_VIDEO_CODECID_MASK);
                st->codec->codec_tag = flags & FLV_VIDEO_CODECID_MASK;
            }
    }

    ret= av_get_packet(&s->pb, pkt, size - 1);
    if (ret <= 0) {
        return AVERROR_IO;
    }
    /* note: we need to modify the packet size here to handle the last
       packet */
    pkt->size = ret;
    pkt->pts = pts;
    pkt->stream_index = st->index;

    if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
        pkt->flags |= PKT_FLAG_KEY;

    return ret;
}

static int flv_read_close(AVFormatContext *s)
{
    return 0;
}

static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
    AVStream *st = s->streams[stream_index];
    int index = av_index_search_timestamp(st, timestamp, flags);
    if (index < 0)
        return -1;
    url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);

    return 0;
}

AVInputFormat flv_demuxer = {
    "flv",
    "flv format",
    0,
    flv_probe,
    flv_read_header,
    flv_read_packet,
    flv_read_close,
    flv_read_seek,
    .extensions = "flv",
    .value = CODEC_ID_FLV1,
};
Commit	Line	Data
d4f5d74a	1	/*
7fbde343	2	* FLV demuxer
d4f5d74a GM	3	* Copyright (c) 2003 The FFmpeg Project.
d4f5d74a GM	4	*
b78e7197 DB	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
d4f5d74a GM	8	* modify it under the terms of the GNU Lesser General Public
d4f5d74a GM	9	* License as published by the Free Software Foundation; either
b78e7197	10	* version 2.1 of the License, or (at your option) any later version.
d4f5d74a	11	*
b78e7197	12	* FFmpeg is distributed in the hope that it will be useful,
d4f5d74a GM	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.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
b78e7197	18	* License along with FFmpeg; if not, write to the Free Software
5509bffa	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
246f86a4 AJ	20	*
	21	*
	22	* This demuxer will generate a 1 byte extradata for VP6F content.
	23	* It is composed of:
	24	* - upper 4bits: difference between encoded width and visible width
	25	* - lower 4bits: difference between encoded height and visible height
d4f5d74a GM	26	*/
d4f5d74a GM	27	#include "avformat.h"
6cac3a3b	28	#include "flv.h"
d4f5d74a	29
d4f5d74a GM	30	static int flv_probe(AVProbeData *p)
	31	{
	32	const uint8_t *d;
	33
	34	if (p->buf_size < 6)
	35	return 0;
	36	d = p->buf;
	37	if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
	38	return 50;
	39	}
	40	return 0;
	41	}
	42
896bcd2e	43	static int amf_get_string(ByteIOContext ioc, char buffer, int buffsize) {
759dd138	44	int length = get_be16(ioc);
896bcd2e MN	45	if(length >= buffsize) {
896bcd2e MN	46	url_fskip(ioc, length);
759dd138	47	return -1;
896bcd2e MN	48	}
	49
	50	get_buffer(ioc, buffer, length);
	51
	52	buffer[length] = '\0';
	53
	54	return length;
	55	}
	56
d4f5d74a GM	57	static int flv_read_header(AVFormatContext *s,
	58	AVFormatParameters *ap)
	59	{
15f14fc7	60	int offset, flags;
4eb0c665	61	AVStream *st;
d4f5d74a	62
d4f5d74a GM	63	url_fskip(&s->pb, 4);
	64	flags = get_byte(&s->pb);
	65
4eb0c665 MN	66	if(flags & FLV_HEADER_FLAG_HASVIDEO){
	67	st = av_new_stream(s, 0);
	68	if (!st)
	69	return AVERROR_NOMEM;
	70	st->codec->codec_type = CODEC_TYPE_VIDEO;
	71	av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
	72	}
	73	if(flags & FLV_HEADER_FLAG_HASAUDIO){
	74	st = av_new_stream(s, 1);
	75	if (!st)
	76	return AVERROR_NOMEM;
	77	st->codec->codec_type = CODEC_TYPE_AUDIO;
	78	av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
	79	}
	80
d4f5d74a GM	81	offset = get_be32(&s->pb);
	82	url_fseek(&s->pb, offset, SEEK_SET);
	83
aeb20f7f N	84	s->start_time = 0;
aeb20f7f N	85
d4f5d74a GM	86	return 0;
	87	}
	88
	89	static int flv_read_packet(AVFormatContext s, AVPacket pkt)
	90	{
aeb20f7f	91	int ret, i, type, size, pts, flags, is_audio, next, pos;
923bd441	92	AVStream *st = NULL;
115329f1	93
068f2a22	94	for(;;){
aeb20f7f	95	pos = url_ftell(&s->pb);
d4f5d74a GM	96	url_fskip(&s->pb, 4); /* size of previous packet */
	97	type = get_byte(&s->pb);
	98	size = get_be24(&s->pb);
	99	pts = get_be24(&s->pb);
92a26775	100	// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
d4f5d74a	101	if (url_feof(&s->pb))
0bd586c5	102	return AVERROR_IO;
d4f5d74a GM	103	url_fskip(&s->pb, 4); /* reserved */
d4f5d74a GM	104	flags = 0;
115329f1	105
068f2a22 MN	106	if(size == 0)
068f2a22 MN	107	continue;
115329f1	108
dd9f5916 MN	109	next= size + url_ftell(&s->pb);
dd9f5916 MN	110
6cac3a3b	111	if (type == FLV_TAG_TYPE_AUDIO) {
068f2a22	112	is_audio=1;
d4f5d74a	113	flags = get_byte(&s->pb);
6cac3a3b	114	} else if (type == FLV_TAG_TYPE_VIDEO) {
068f2a22	115	is_audio=0;
d4f5d74a	116	flags = get_byte(&s->pb);
6cac3a3b	117	} else if (type == FLV_TAG_TYPE_META && size > 13+1+4) {
dd9f5916 MN	118	url_fskip(&s->pb, 13); //onMetaData blah
	119	if(get_byte(&s->pb) == 8){
	120	url_fskip(&s->pb, 4);
	121	}
	122	while(url_ftell(&s->pb) + 5 < next){
	123	char tmp[128];
	124	int type, len;
	125	double d= 0;
115329f1	126
17fcb170	127	if(amf_get_string(&s->pb, tmp, sizeof(tmp))<0)
dd9f5916	128	break;
115329f1	129
dd9f5916	130	type= get_byte(&s->pb);
6cac3a3b	131	if(type == AMF_DATA_TYPE_NUMBER){
dd9f5916	132	d= av_int2dbl(get_be64(&s->pb));
6cac3a3b	133	}else if(type == AMF_DATA_TYPE_STRING){
17fcb170	134	amf_get_string(&s->pb, NULL, 0);
6cac3a3b	135	}else if(type == AMF_DATA_TYPE_MIXEDARRAY){
dd9f5916 MN	136	//array
dd9f5916 MN	137	break;
6cac3a3b	138	}else if(type == AMF_DATA_TYPE_DATE){
dd9f5916 MN	139	d= av_int2dbl(get_be64(&s->pb));
	140	get_be16(&s->pb);
	141	}
115329f1	142
dd9f5916 MN	143	if(!strcmp(tmp, "duration")){
	144	s->duration = d*AV_TIME_BASE;
	145	}else if(!strcmp(tmp, "videodatarate")){
	146	}else if(!strcmp(tmp, "audiodatarate")){
	147	}
	148	}
	149	url_fseek(&s->pb, next, SEEK_SET);
	150	continue;
d4f5d74a	151	} else {
d4f5d74a	152	/* skip packet */
bc874dae	153	av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
dd9f5916	154	url_fseek(&s->pb, next, SEEK_SET);
068f2a22	155	continue;
d4f5d74a GM	156	}
	157
	158	/* now find stream */
	159	for(i=0;i<s->nb_streams;i++) {
	160	st = s->streams[i];
068f2a22 MN	161	if (st->id == is_audio)
068f2a22 MN	162	break;
d4f5d74a	163	}
068f2a22	164	if(i == s->nb_streams){
4eb0c665 MN	165	av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
	166	url_fseek(&s->pb, next, SEEK_SET);
	167	continue;
6ed08157	168	}
f3356e9c	169	// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
6cac3a3b AH	170	if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY \|\| is_audio))
6cac3a3b AH	171	\|\|(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
f3356e9c MN	172	\|\| st->discard >= AVDISCARD_ALL
f3356e9c MN	173	){
dd9f5916	174	url_fseek(&s->pb, next, SEEK_SET);
b9866ebc MN	175	continue;
b9866ebc MN	176	}
6cac3a3b	177	if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
aeb20f7f	178	av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
068f2a22 MN	179	break;
	180	}
	181
15f14fc7 MN	182	// if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
	183	if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
	184	int size;
	185	const int pos= url_ftell(&s->pb);
	186	const int fsize= url_fsize(&s->pb);
	187	url_fseek(&s->pb, fsize-4, SEEK_SET);
	188	size= get_be32(&s->pb);
	189	url_fseek(&s->pb, fsize-3-size, SEEK_SET);
	190	if(size == get_be24(&s->pb) + 11){
	191	s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
	192	}
	193	url_fseek(&s->pb, pos, SEEK_SET);
	194	}
	195
068f2a22	196	if(is_audio){
01f4895c	197	if(st->codec->sample_rate == 0){
6cac3a3b AH	198	st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
6cac3a3b AH	199	if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
01f4895c	200	st->codec->sample_rate= 8000;
068f2a22	201	else
6cac3a3b AH	202	st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
	203	switch(flags & FLV_AUDIO_CODECID_MASK) {
	204	case FLV_CODECID_PCM_BE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16BE;
bb270c08	205	else st->codec->codec_id = CODEC_ID_PCM_S8; break;
6cac3a3b AH	206	case FLV_CODECID_ADPCM : st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
6cac3a3b AH	207	case FLV_CODECID_MP3 : st->codec->codec_id = CODEC_ID_MP3 ; st->need_parsing = 1; break;
bb270c08	208	// this is not listed at FLV but at SWF, strange...
6cac3a3b	209	case FLV_CODECID_PCM_LE: if (flags & FLV_AUDIO_SAMPLESIZE_MASK) st->codec->codec_id = CODEC_ID_PCM_S16LE;
bb270c08	210	else st->codec->codec_id = CODEC_ID_PCM_S8; break;
068f2a22	211	default:
bb270c08	212	av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
01f4895c	213	st->codec->codec_tag= (flags >> 4);
068f2a22	214	}
6cac3a3b	215	st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
068f2a22 MN	216	}
068f2a22 MN	217	}else{
6cac3a3b AH	218	switch(flags & FLV_VIDEO_CODECID_MASK){
	219	case FLV_CODECID_H263 : st->codec->codec_id = CODEC_ID_FLV1 ; break;
	220	case FLV_CODECID_SCREEN: st->codec->codec_id = CODEC_ID_FLASHSV; break;
	221	case FLV_CODECID_VP6 :
5ce117c3	222	st->codec->codec_id = CODEC_ID_VP6F;
9e2424ce AJ	223	if (st->codec->extradata_size != 1) {
	224	st->codec->extradata_size = 1;
	225	st->codec->extradata = av_malloc(1);
	226	}
	227	/* width and height adjustment */
	228	st->codec->extradata[0] = get_byte(&s->pb);
5ce117c3 AJ	229	size--;
5ce117c3 AJ	230	break;
068f2a22	231	default:
6cac3a3b AH	232	av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & FLV_VIDEO_CODECID_MASK);
6cac3a3b AH	233	st->codec->codec_tag = flags & FLV_VIDEO_CODECID_MASK;
068f2a22	234	}
bb01a3f0 MN	235	}
bb01a3f0 MN	236
dd9f5916	237	ret= av_get_packet(&s->pb, pkt, size - 1);
d4f5d74a	238	if (ret <= 0) {
0bd586c5	239	return AVERROR_IO;
d4f5d74a GM	240	}
	241	/* note: we need to modify the packet size here to handle the last
	242	packet */
	243	pkt->size = ret;
	244	pkt->pts = pts;
	245	pkt->stream_index = st->index;
115329f1	246
6cac3a3b	247	if (is_audio \|\| ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
bb270c08	248	pkt->flags \|= PKT_FLAG_KEY;
115329f1	249
d4f5d74a GM	250	return ret;
	251	}
	252
	253	static int flv_read_close(AVFormatContext *s)
	254	{
	255	return 0;
	256	}
	257
aeb20f7f N	258	static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
	259	{
	260	AVStream *st = s->streams[stream_index];
	261	int index = av_index_search_timestamp(st, timestamp, flags);
	262	if (index < 0)
	263	return -1;
	264	url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
	265
	266	return 0;
	267	}
	268
d2a067d1	269	AVInputFormat flv_demuxer = {
d4f5d74a GM	270	"flv",
	271	"flv format",
	272	0,
	273	flv_probe,
	274	flv_read_header,
	275	flv_read_packet,
	276	flv_read_close,
aeb20f7f	277	flv_read_seek,
d4f5d74a GM	278	.extensions = "flv",
	279	.value = CODEC_ID_FLV1,
	280	};