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mpv/libmpdemux/demux_lavf.c

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/*
Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// #include <stdio.h>
#include <stdlib.h>
// #include <unistd.h>
#include <limits.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "m_option.h"
#ifdef USE_LIBAVFORMAT_SO
#include <ffmpeg/avformat.h>
#include <ffmpeg/avutil.h>
#include <ffmpeg/opt.h>
#else
#include "avformat.h"
#include "avutil.h"
#include "avi.h"
#include "opt.h"
#endif
#include "riff.h"
#define PROBE_BUF_SIZE 2048
extern char *audio_lang;
static unsigned int opt_probesize = 0;
static char *opt_format;
m_option_t lavfdopts_conf[] = {
{"probesize", &(opt_probesize), CONF_TYPE_INT, CONF_RANGE, 32, INT_MAX, NULL},
{"format", &(opt_format), CONF_TYPE_STRING, 0, 0, 0, NULL},
{NULL, NULL, 0, 0, 0, 0, NULL}
};
typedef struct lavf_priv_t{
AVInputFormat *avif;
AVFormatContext *avfc;
ByteIOContext pb;
int audio_streams;
int video_streams;
int64_t last_pts;
int astreams[MAX_A_STREAMS];
int vstreams[MAX_V_STREAMS];
}lavf_priv_t;
extern void print_wave_header(WAVEFORMATEX *h, int verbose_level);
extern void print_video_header(BITMAPINFOHEADER *h, int verbose_level);
static const AVCodecTag mp_wav_tags[] = {
{ CODEC_ID_ADPCM_4XM, MKTAG('4', 'X', 'M', 'A')},
{ CODEC_ID_ADPCM_EA, MKTAG('A', 'D', 'E', 'A')},
{ CODEC_ID_ADPCM_IMA_WS, MKTAG('A', 'I', 'W', 'S')},
{ CODEC_ID_ADPCM_THP, MKTAG('T', 'H', 'P', 'A')},
{ CODEC_ID_AMR_NB, MKTAG('n', 'b', 0, 0)},
{ CODEC_ID_DSICINAUDIO, MKTAG('D', 'C', 'I', 'A')},
{ CODEC_ID_INTERPLAY_DPCM, MKTAG('I', 'N', 'P', 'A')},
{ CODEC_ID_MUSEPACK7, MKTAG('M', 'P', 'C', ' ')},
{ CODEC_ID_PCM_S24BE, MKTAG('i', 'n', '2', '4')},
{ CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's')},
{ CODEC_ID_PCM_S8, MKTAG('t', 'w', 'o', 's')},
{ CODEC_ID_ROQ_DPCM, MKTAG('R', 'o', 'Q', 'A')},
{ CODEC_ID_SHORTEN, MKTAG('s', 'h', 'r', 'n')},
{ CODEC_ID_TTA, MKTAG('T', 'T', 'A', '1')},
{ CODEC_ID_WAVPACK, MKTAG('W', 'V', 'P', 'K')},
{ CODEC_ID_WESTWOOD_SND1, MKTAG('S', 'N', 'D', '1')},
{ CODEC_ID_XAN_DPCM, MKTAG('A', 'x', 'a', 'n')},
{ 0, 0 },
};
const struct AVCodecTag *mp_wav_taglists[] = {codec_wav_tags, mp_wav_tags, 0};
static const AVCodecTag mp_bmp_tags[] = {
{ CODEC_ID_BETHSOFTVID, MKTAG('B', 'E', 'T', 'H')},
{ CODEC_ID_C93, MKTAG('C', '9', '3', 'V')},
{ CODEC_ID_DSICINVIDEO, MKTAG('D', 'C', 'I', 'V')},
{ CODEC_ID_DXA, MKTAG('D', 'X', 'A', '1')},
{ CODEC_ID_FLIC, MKTAG('F', 'L', 'I', 'C')},
{ CODEC_ID_IDCIN, MKTAG('I', 'D', 'C', 'I')},
{ CODEC_ID_INTERPLAY_VIDEO, MKTAG('I', 'N', 'P', 'V')},
{ CODEC_ID_ROQ, MKTAG('R', 'o', 'Q', 'V')},
{ CODEC_ID_THP, MKTAG('T', 'H', 'P', 'V')},
{ CODEC_ID_TIERTEXSEQVIDEO, MKTAG('T', 'S', 'E', 'Q')},
{ CODEC_ID_VMDVIDEO, MKTAG('V', 'M', 'D', 'V')},
{ CODEC_ID_WS_VQA, MKTAG('V', 'Q', 'A', 'V')},
{ CODEC_ID_XAN_WC3, MKTAG('W', 'C', '3', 'V')},
{ 0, 0 },
};
const struct AVCodecTag *mp_bmp_taglists[] = {codec_bmp_tags, mp_bmp_tags, 0};
static int mp_open(URLContext *h, const char *filename, int flags){
return 0;
}
static int mp_read(URLContext *h, unsigned char *buf, int size){
stream_t *stream = (stream_t*)h->priv_data;
int ret;
if(stream_eof(stream)) //needed?
return -1;
ret=stream_read(stream, buf, size);
mp_msg(MSGT_HEADER,MSGL_DBG2,"%d=mp_read(%p, %p, %d), eof:%d\n", ret, h, buf, size, stream->eof);
return ret;
}
static int mp_write(URLContext *h, unsigned char *buf, int size){
return -1;
}
static offset_t mp_seek(URLContext *h, offset_t pos, int whence){
stream_t *stream = (stream_t*)h->priv_data;
mp_msg(MSGT_HEADER,MSGL_DBG2,"mp_seek(%p, %d, %d)\n", h, (int)pos, whence);
if(whence == SEEK_CUR)
pos +=stream_tell(stream);
else if(whence == SEEK_END)
pos += stream->end_pos;
else if(whence == SEEK_SET)
pos += stream->start_pos;
else
return -1;
if(pos<stream->end_pos && stream->eof)
stream_reset(stream);
if(stream_seek(stream, pos)==0)
return -1;
return pos - stream->start_pos;
}
static int mp_close(URLContext *h){
return 0;
}
static URLProtocol mp_protocol = {
"mp",
mp_open,
mp_read,
mp_write,
mp_seek,
mp_close,
};
static void list_formats(void) {
AVInputFormat *fmt;
mp_msg(MSGT_DEMUX, MSGL_INFO, "Available lavf input formats:\n");
for (fmt = first_iformat; fmt; fmt = fmt->next)
mp_msg(MSGT_DEMUX, MSGL_INFO, "%15s : %s\n", fmt->name, fmt->long_name);
}
static int lavf_check_file(demuxer_t *demuxer){
AVProbeData avpd;
uint8_t buf[PROBE_BUF_SIZE];
lavf_priv_t *priv;
if(!demuxer->priv)
demuxer->priv=calloc(sizeof(lavf_priv_t),1);
priv= demuxer->priv;
av_register_all();
if(stream_read(demuxer->stream, buf, PROBE_BUF_SIZE)!=PROBE_BUF_SIZE)
return 0;
avpd.filename= demuxer->stream->url;
avpd.buf= buf;
avpd.buf_size= PROBE_BUF_SIZE;
if (opt_format) {
if (strcmp(opt_format, "help") == 0) {
list_formats();
return 0;
}
priv->avif= av_find_input_format(opt_format);
if (!priv->avif) {
mp_msg(MSGT_DEMUX,MSGL_FATAL,"Unknown lavf format %s\n", opt_format);
return 0;
}
mp_msg(MSGT_DEMUX,MSGL_INFO,"Forced lavf %s demuxer\n", priv->avif->long_name);
return DEMUXER_TYPE_LAVF;
}
priv->avif= av_probe_input_format(&avpd, 1);
if(!priv->avif){
mp_msg(MSGT_HEADER,MSGL_V,"LAVF_check: no clue about this gibberish!\n");
return 0;
}else
mp_msg(MSGT_HEADER,MSGL_V,"LAVF_check: %s\n", priv->avif->long_name);
return DEMUXER_TYPE_LAVF;
}
static const char *preferred_list[] = {
"dxa",
"wv",
"nuv",
"nut",
"gxf",
"mxf",
"flv",
"swf",
NULL
};
static int lavf_check_preferred_file(demuxer_t *demuxer){
if (lavf_check_file(demuxer)) {
char **p = preferred_list;
lavf_priv_t *priv = demuxer->priv;
while (*p) {
if (strcmp(*p, priv->avif->name) == 0)
return DEMUXER_TYPE_LAVF_PREFERRED;
p++;
}
}
return 0;
}
static demuxer_t* demux_open_lavf(demuxer_t *demuxer){
AVFormatContext *avfc;
AVFormatParameters ap;
AVOption *opt;
lavf_priv_t *priv= demuxer->priv;
int i,g;
char mp_filename[256]="mp:";
memset(&ap, 0, sizeof(AVFormatParameters));
stream_seek(demuxer->stream, 0);
register_protocol(&mp_protocol);
avfc = av_alloc_format_context();
if (correct_pts)
avfc->flags |= AVFMT_FLAG_GENPTS;
if (index_mode == 0)
avfc->flags |= AVFMT_FLAG_IGNIDX;
ap.prealloced_context = 1;
if(opt_probesize) {
double d = (double) opt_probesize;
opt = av_set_double(avfc, "probesize", opt_probesize);
if(!opt) mp_msg(MSGT_HEADER,MSGL_ERR, "demux_lavf, couldn't set option probesize to %.3f\r\n", d);
}
if(demuxer->stream->url)
strncpy(mp_filename + 3, demuxer->stream->url, sizeof(mp_filename)-3);
else
strncpy(mp_filename + 3, "foobar.dummy", sizeof(mp_filename)-3);
url_fopen(&priv->pb, mp_filename, URL_RDONLY);
((URLContext*)(priv->pb.opaque))->priv_data= demuxer->stream;
if(av_open_input_stream(&avfc, &priv->pb, mp_filename, priv->avif, &ap)<0){
mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF_header: av_open_input_stream() failed\n");
return NULL;
}
priv->avfc= avfc;
if(av_find_stream_info(avfc) < 0){
mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF_header: av_find_stream_info() failed\n");
return NULL;
}
if(avfc->title [0]) demux_info_add(demuxer, "name" , avfc->title );
if(avfc->author [0]) demux_info_add(demuxer, "author" , avfc->author );
if(avfc->copyright[0]) demux_info_add(demuxer, "copyright", avfc->copyright);
if(avfc->comment [0]) demux_info_add(demuxer, "comments" , avfc->comment );
if(avfc->album [0]) demux_info_add(demuxer, "album" , avfc->album );
// if(avfc->year ) demux_info_add(demuxer, "year" , avfc->year );
// if(avfc->track ) demux_info_add(demuxer, "track" , avfc->track );
if(avfc->genre [0]) demux_info_add(demuxer, "genre" , avfc->genre );
for(i=0; i<avfc->nb_streams; i++){
AVStream *st= avfc->streams[i];
AVCodecContext *codec= st->codec;
switch(codec->codec_type){
case CODEC_TYPE_AUDIO:{
WAVEFORMATEX *wf= calloc(sizeof(WAVEFORMATEX) + codec->extradata_size, 1);
sh_audio_t* sh_audio;
if(priv->audio_streams >= MAX_A_STREAMS)
break;
sh_audio=new_sh_audio(demuxer, i);
mp_msg(MSGT_DEMUX, MSGL_INFO, MSGTR_AudioID, "lavf", i);
if(!sh_audio)
break;
priv->astreams[priv->audio_streams] = i;
priv->audio_streams++;
// mp4a tag is used for all mp4 files no matter what they actually contain
if(codec->codec_tag == MKTAG('m', 'p', '4', 'a'))
codec->codec_tag= 0;
if(!codec->codec_tag)
codec->codec_tag= av_codec_get_tag(mp_wav_taglists, codec->codec_id);
wf->wFormatTag= codec->codec_tag;
wf->nChannels= codec->channels;
wf->nSamplesPerSec= codec->sample_rate;
wf->nAvgBytesPerSec= codec->bit_rate/8;
wf->nBlockAlign= codec->block_align ? codec->block_align : 1;
wf->wBitsPerSample= codec->bits_per_sample;
wf->cbSize= codec->extradata_size;
if(codec->extradata_size){
memcpy(
wf + 1,
codec->extradata,
codec->extradata_size);
}
sh_audio->wf= wf;
sh_audio->audio.dwSampleSize= codec->block_align;
if(codec->frame_size && codec->sample_rate){
sh_audio->audio.dwScale=codec->frame_size;
sh_audio->audio.dwRate= codec->sample_rate;
}else{
sh_audio->audio.dwScale= codec->block_align ? codec->block_align*8 : 8;
sh_audio->audio.dwRate = codec->bit_rate;
}
g= ff_gcd(sh_audio->audio.dwScale, sh_audio->audio.dwRate);
sh_audio->audio.dwScale /= g;
sh_audio->audio.dwRate /= g;
// printf("sca:%d rat:%d fs:%d sr:%d ba:%d\n", sh_audio->audio.dwScale, sh_audio->audio.dwRate, codec->frame_size, codec->sample_rate, codec->block_align);
sh_audio->ds= demuxer->audio;
sh_audio->format= codec->codec_tag;
sh_audio->channels= codec->channels;
sh_audio->samplerate= codec->sample_rate;
sh_audio->i_bps= codec->bit_rate/8;
switch (codec->codec_id) {
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
sh_audio->samplesize = 1;
break;
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
sh_audio->samplesize = 2;
break;
case CODEC_ID_PCM_ALAW:
sh_audio->format = 0x6;
break;
case CODEC_ID_PCM_MULAW:
sh_audio->format = 0x7;
break;
}
if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_wave_header(sh_audio->wf, MSGL_V);
if((audio_lang && st->language[0] && !strncmp(audio_lang, st->language, 3))
|| (demuxer->audio->id == i || demuxer->audio->id == -1)
) {
demuxer->audio->id = i;
demuxer->audio->sh= demuxer->a_streams[i];
}
else
st->discard= AVDISCARD_ALL;
break;}
case CODEC_TYPE_VIDEO:{
sh_video_t* sh_video;
BITMAPINFOHEADER *bih;
if(priv->video_streams >= MAX_V_STREAMS)
break;
sh_video=new_sh_video(demuxer, i);
mp_msg(MSGT_DEMUX, MSGL_INFO, MSGTR_VideoID, "lavf", i);
if(!sh_video) break;
priv->vstreams[priv->video_streams] = i;
priv->video_streams++;
bih=calloc(sizeof(BITMAPINFOHEADER) + codec->extradata_size,1);
if(!codec->codec_tag)
codec->codec_tag= av_codec_get_tag(mp_bmp_taglists, codec->codec_id);
bih->biSize= sizeof(BITMAPINFOHEADER) + codec->extradata_size;
bih->biWidth= codec->width;
bih->biHeight= codec->height;
bih->biBitCount= codec->bits_per_sample;
bih->biSizeImage = bih->biWidth * bih->biHeight * bih->biBitCount/8;
bih->biCompression= codec->codec_tag;
sh_video->bih= bih;
sh_video->disp_w= codec->width;
sh_video->disp_h= codec->height;
if (st->time_base.den) { /* if container has time_base, use that */
sh_video->video.dwRate= st->time_base.den;
sh_video->video.dwScale= st->time_base.num;
} else {
sh_video->video.dwRate= codec->time_base.den;
sh_video->video.dwScale= codec->time_base.num;
}
sh_video->fps=av_q2d(st->r_frame_rate);
sh_video->frametime=1/av_q2d(st->r_frame_rate);
sh_video->format = bih->biCompression;
sh_video->aspect= codec->width * codec->sample_aspect_ratio.num
/ (float)(codec->height * codec->sample_aspect_ratio.den);
sh_video->i_bps= codec->bit_rate/8;
mp_msg(MSGT_DEMUX,MSGL_DBG2,"aspect= %d*%d/(%d*%d)\n",
codec->width, codec->sample_aspect_ratio.num,
codec->height, codec->sample_aspect_ratio.den);
sh_video->ds= demuxer->video;
if(codec->extradata_size)
memcpy(sh_video->bih + 1, codec->extradata, codec->extradata_size);
if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_video_header(sh_video->bih, MSGL_V);
/* short biPlanes;
int biXPelsPerMeter;
int biYPelsPerMeter;
int biClrUsed;
int biClrImportant;*/
if(demuxer->video->id != i && demuxer->video->id != -1)
st->discard= AVDISCARD_ALL;
else{
demuxer->video->id = i;
demuxer->video->sh= demuxer->v_streams[i];
}
break;}
default:
st->discard= AVDISCARD_ALL;
}
}
mp_msg(MSGT_HEADER,MSGL_V,"LAVF: %d audio and %d video streams found\n",priv->audio_streams,priv->video_streams);
mp_msg(MSGT_HEADER,MSGL_V,"LAVF: build %d\n", LIBAVFORMAT_BUILD);
if(!priv->audio_streams) demuxer->audio->id=-2; // nosound
// else if(best_audio > 0 && demuxer->audio->id == -1) demuxer->audio->id=best_audio;
if(!priv->video_streams){
if(!priv->audio_streams){
mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF: no audio or video headers found - broken file?\n");
return NULL;
}
demuxer->video->id=-2; // audio-only
} //else if (best_video > 0 && demuxer->video->id == -1) demuxer->video->id = best_video;
return demuxer;
}
static int demux_lavf_fill_buffer(demuxer_t *demux, demux_stream_t *dsds){
lavf_priv_t *priv= demux->priv;
AVPacket pkt;
demux_packet_t *dp;
demux_stream_t *ds;
int id;
mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_lavf_fill_buffer()\n");
demux->filepos=stream_tell(demux->stream);
if(av_read_frame(priv->avfc, &pkt) < 0)
return 0;
id= pkt.stream_index;
if(id==demux->audio->id){
// audio
ds=demux->audio;
if(!ds->sh){
ds->sh=demux->a_streams[id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected LAVF audio ID = %d\n",ds->id);
}
} else if(id==demux->video->id){
// video
ds=demux->video;
if(!ds->sh){
ds->sh=demux->v_streams[id];
mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected LAVF video ID = %d\n",ds->id);
}
} else {
av_free_packet(&pkt);
return 1;
}
if(0/*pkt.destruct == av_destruct_packet*/){
//ok kids, dont try this at home :)
dp=malloc(sizeof(demux_packet_t));
dp->len=pkt.size;
dp->next=NULL;
dp->refcount=1;
dp->master=NULL;
dp->buffer=pkt.data;
pkt.destruct= NULL;
}else{
dp=new_demux_packet(pkt.size);
memcpy(dp->buffer, pkt.data, pkt.size);
av_free_packet(&pkt);
}
if(pkt.pts != AV_NOPTS_VALUE){
dp->pts=pkt.pts * av_q2d(priv->avfc->streams[id]->time_base);
priv->last_pts= dp->pts * AV_TIME_BASE;
}
dp->pos=demux->filepos;
dp->flags= !!(pkt.flags&PKT_FLAG_KEY);
// append packet to DS stream:
ds_add_packet(ds,dp);
return 1;
}
static void demux_seek_lavf(demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags){
lavf_priv_t *priv = demuxer->priv;
int avsflags = 0;
mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_seek_lavf(%p, %f, %f, %d)\n", demuxer, rel_seek_secs, audio_delay, flags);
if (flags & 1) // absolute seek
priv->last_pts = priv->avfc->start_time;
if (flags & 2) { // percent seek
if (priv->avfc->duration == 0 || priv->avfc->duration == AV_NOPTS_VALUE)
return;
priv->last_pts += rel_seek_secs * priv->avfc->duration;
} else {
priv->last_pts += rel_seek_secs * AV_TIME_BASE;
if (rel_seek_secs < 0) avsflags = AVSEEK_FLAG_BACKWARD;
}
av_seek_frame(priv->avfc, -1, priv->last_pts, avsflags);
}
static int demux_lavf_control(demuxer_t *demuxer, int cmd, void *arg)
{
lavf_priv_t *priv = demuxer->priv;
switch (cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (priv->avfc->duration == 0 || priv->avfc->duration == AV_NOPTS_VALUE)
return DEMUXER_CTRL_DONTKNOW;
*((double *)arg) = (double)priv->avfc->duration / AV_TIME_BASE;
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_GET_PERCENT_POS:
if (priv->avfc->duration == 0 || priv->avfc->duration == AV_NOPTS_VALUE)
return DEMUXER_CTRL_DONTKNOW;
*((int *)arg) = (int)((priv->last_pts - priv->avfc->start_time)*100 / priv->avfc->duration);
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_SWITCH_AUDIO:
case DEMUXER_CTRL_SWITCH_VIDEO:
{
int id = *((int*)arg);
int newid = -2;
int i, curridx = -2;
int nstreams, *pstreams;
demux_stream_t *ds;
if(cmd == DEMUXER_CTRL_SWITCH_VIDEO)
{
ds = demuxer->video;
nstreams = priv->video_streams;
pstreams = priv->vstreams;
}
else
{
ds = demuxer->audio;
nstreams = priv->audio_streams;
pstreams = priv->astreams;
}
if(ds->id == -2)
return DEMUXER_CTRL_NOTIMPL;
for(i = 0; i < nstreams; i++)
{
if(pstreams[i] == ds->id) //current stream id
{
curridx = i;
break;
}
}
if(id < 0)
{
i = (curridx + 1) % nstreams;
newid = pstreams[i];
}
else
{
for(i = 0; i < nstreams; i++)
{
if(pstreams[i] == id)
{
newid = id;
break;
}
}
}
if(newid == -2 || i == curridx)
return DEMUXER_CTRL_NOTIMPL;
else
{
ds_free_packs(ds);
priv->avfc->streams[ds->id]->discard = AVDISCARD_ALL;
*((int*)arg) = ds->id = newid;
priv->avfc->streams[newid]->discard = AVDISCARD_NONE;
return DEMUXER_CTRL_OK;
}
}
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
static void demux_close_lavf(demuxer_t *demuxer)
{
lavf_priv_t* priv = demuxer->priv;
if (priv){
if(priv->avfc)
{
av_close_input_file(priv->avfc); priv->avfc= NULL;
}
free(priv); demuxer->priv= NULL;
}
}
demuxer_desc_t demuxer_desc_lavf = {
"libavformat demuxer",
"lavf",
"libavformat",
"Michael Niedermayer",
"supports many formats, requires libavformat",
DEMUXER_TYPE_LAVF,
0, // Check after other demuxer
lavf_check_file,
demux_lavf_fill_buffer,
demux_open_lavf,
demux_close_lavf,
demux_seek_lavf,
demux_lavf_control
};
demuxer_desc_t demuxer_desc_lavf_preferred = {
"libavformat preferred demuxer",
"lavfpref",
"libavformat",
"Michael Niedermayer",
"supports many formats, requires libavformat",
DEMUXER_TYPE_LAVF_PREFERRED,
0, // Check after other demuxer
lavf_check_preferred_file,
demux_lavf_fill_buffer,
demux_open_lavf,
demux_close_lavf,
demux_seek_lavf,
demux_lavf_control
};
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