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mpv/libmpdemux/demux_mpg.c
aurel 6943b13bb5 seeking based on the largest timestamp in an mpeg stream 
It is often more accurate than the current seeking and it has the
additional benefit of giving the (almost) precise total time of the movie.
patch by Michael Behrisch < behrisch at informatik.hu-berlin.de >


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13739 b3059339-0415-0410-9bf9-f77b7e298cf2
2004-10-23 00:05:38 +00:00

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// MPG/VOB file parser for DEMUXER v2.5 by A'rpi/ESP-team
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "parse_es.h"
#include "stheader.h"
#include "mp3_hdr.h"
//#define MAX_PS_PACKETSIZE 2048
#define MAX_PS_PACKETSIZE (224*1024)
typedef struct mpg_demuxer {
float last_pts;
float final_pts;
int has_valid_timestamps;
} mpg_demuxer_t;
static int mpeg_pts_error=0;
/// Open an mpg physical stream
int demux_mpg_open(demuxer_t* demuxer) {
stream_t *s = demuxer->stream;
off_t pos = stream_tell(s);
off_t end_seq_start = demuxer->movi_end-500000; // 500000 is a wild guess
float half_pts = 0.0;
mpg_demuxer_t* mpg_d;
if (!ds_fill_buffer(demuxer->video)) return 0;
mpg_d = (mpg_demuxer_t*)calloc(1,sizeof(mpg_demuxer_t));
demuxer->priv = mpg_d;
mpg_d->final_pts = 0.0;
mpg_d->has_valid_timestamps = 1;
if (demuxer->seekable && stream_tell(demuxer->stream) < end_seq_start) {
stream_seek(s,(pos + end_seq_start / 2));
while ((!s->eof) && ds_fill_buffer(demuxer->video) && half_pts == 0.0) {
half_pts = mpg_d->last_pts;
}
stream_seek(s,end_seq_start);
while ((!s->eof) && ds_fill_buffer(demuxer->video)) {
if (mpg_d->final_pts < mpg_d->last_pts) mpg_d->final_pts = mpg_d->last_pts;
}
// educated guess about validity of timestamps
if (mpg_d->final_pts > 3 * half_pts || mpg_d->final_pts < 1.5 * half_pts) {
mpg_d->has_valid_timestamps = 0;
}
ds_free_packs(demuxer->audio);
ds_free_packs(demuxer->video);
demuxer->stream->eof=0; // clear eof flag
demuxer->video->eof=0;
demuxer->audio->eof=0;
stream_seek(s,pos);
ds_fill_buffer(demuxer->video);
}
return 1;
}
void demux_close_mpg(demuxer_t* demuxer) {
mpg_demuxer_t* mpg_d = demuxer->priv;
if (mpg_d) free(mpg_d);
}
static unsigned int read_mpeg_timestamp(stream_t *s,int c){
int d,e;
unsigned int pts;
d=stream_read_word(s);
e=stream_read_word(s);
if( ((c&1)!=1) || ((d&1)!=1) || ((e&1)!=1) ){
++mpeg_pts_error;
return 0; // invalid pts
}
pts=(((c>>1)&7)<<30)|((d>>1)<<15)|(e>>1);
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"{%d}",pts);
return pts;
}
static int demux_mpg_read_packet(demuxer_t *demux,int id){
int d;
int len;
unsigned char c=0;
unsigned int pts=0;
unsigned int dts=0;
demux_stream_t *ds=NULL;
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_read_packet: %X\n",id);
// if(id==0x1F0){
// demux->synced=0; // force resync after 0x1F0
// return -1;
//}
// if(id==0x1BA) packet_start_pos=stream_tell(demux->stream);
if(id<0x1BC || id>=0x1F0) return -1;
if(id==0x1BE) return -1; // padding stream
if(id==0x1BF) return -1; // private2
len=stream_read_word(demux->stream);
mp_dbg(MSGT_DEMUX,MSGL_DBG3,"PACKET len=%d",len);
// if(len==62480){ demux->synced=0;return -1;} /* :) */
if(len==0 || len>MAX_PS_PACKETSIZE){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Invalid PS packet len: %d\n",len);
return -2; // invalid packet !!!!!!
}
mpeg_pts_error=0;
while(len>0){ // Skip stuFFing bytes
c=stream_read_char(demux->stream);--len;
if(c!=0xFF)break;
}
if((c>>6)==1){ // Read (skip) STD scale & size value
// printf(" STD_scale=%d",(c>>5)&1);
d=((c&0x1F)<<8)|stream_read_char(demux->stream);
len-=2;
// printf(" STD_size=%d",d);
c=stream_read_char(demux->stream);
}
// Read System-1 stream timestamps:
if((c>>4)==2){
pts=read_mpeg_timestamp(demux->stream,c);
len-=4;
} else
if((c>>4)==3){
pts=read_mpeg_timestamp(demux->stream,c);
c=stream_read_char(demux->stream);
if((c>>4)!=1) pts=0; //printf("{ERROR4}");
dts=read_mpeg_timestamp(demux->stream,c);
len-=4+1+4;
} else
if((c>>6)==2){
int pts_flags;
int hdrlen;
// System-2 (.VOB) stream:
if((c>>4)&3) {
mp_msg(MSGT_DEMUX,MSGL_WARN,MSGTR_EncryptedVOB);
}
c=stream_read_char(demux->stream); pts_flags=c>>6;
c=stream_read_char(demux->stream); hdrlen=c;
len-=2;
mp_dbg(MSGT_DEMUX,MSGL_DBG3," hdrlen=%d (len=%d)",hdrlen,len);
if(hdrlen>len){ mp_msg(MSGT_DEMUX,MSGL_V,"demux_mpg: invalid header length \n"); return -1;}
if(pts_flags==2 && hdrlen>=5){
c=stream_read_char(demux->stream);
pts=read_mpeg_timestamp(demux->stream,c);
len-=5;hdrlen-=5;
} else
if(pts_flags==3 && hdrlen>=10){
c=stream_read_char(demux->stream);
pts=read_mpeg_timestamp(demux->stream,c);
c=stream_read_char(demux->stream);
dts=read_mpeg_timestamp(demux->stream,c);
len-=10;hdrlen-=10;
}
len-=hdrlen;
if(hdrlen>0) stream_skip(demux->stream,hdrlen); // skip header bytes
//============== DVD Audio sub-stream ======================
if(id==0x1BD){
int aid=stream_read_char(demux->stream);--len;
if(len<3) return -1; // invalid audio packet
// AID:
// 0x20..0x3F subtitle
// 0x80..0x9F AC3 audio
// 0xA0..0xBF PCM audio
if((aid & 0xE0) == 0x20){
// subtitle:
aid&=0x1F;
if(!demux->s_streams[aid]){
mp_msg(MSGT_DEMUX,MSGL_V,"==> Found subtitle: %d\n",aid);
demux->s_streams[aid]=1;
}
if(demux->sub->id==aid){
ds=demux->sub;
}
} else if((aid & 0xC0) == 0x80 || (aid & 0xE0) == 0x00) {
// aid=128+(aid&0x7F);
// aid=0x80..0xBF
if(!demux->a_streams[aid]) new_sh_audio(demux,aid);
if(demux->audio->id==-1) demux->audio->id=aid;
if(demux->audio->id==aid){
int type;
ds=demux->audio;
if(!ds->sh) ds->sh=demux->a_streams[aid];
// READ Packet: Skip additional audio header data:
c=stream_read_char(demux->stream);//num of frames
type=stream_read_char(demux->stream);//startpos hi
type=(type<<8)|stream_read_char(demux->stream);//startpos lo
// printf("\r[%02X][%04X]",c,type);
len-=3;
if((aid&0xE0)==0xA0 && len>=3){
unsigned char* hdr;
// save audio header as codecdata!
if(!((sh_audio_t*)(ds->sh))->codecdata_len){
((sh_audio_t*)(ds->sh))->codecdata=malloc(3);
((sh_audio_t*)(ds->sh))->codecdata_len=3;
}
hdr=((sh_audio_t*)(ds->sh))->codecdata;
// read LPCM header:
// emphasis[1], mute[1], rvd[1], frame number[5]:
hdr[0]=stream_read_char(demux->stream);
// printf(" [%01X:%02d]",c>>5,c&31);
// quantization[2],freq[2],rvd[1],channels[3]
hdr[1]=stream_read_char(demux->stream);
// printf("[%01X:%01X] ",c>>4,c&15);
// dynamic range control (0x80=off):
hdr[2]=stream_read_char(demux->stream);
// printf("[%02X] ",c);
len-=3;
if(len<=0) mp_msg(MSGT_DEMUX,MSGL_V,"End of packet while searching for PCM header\n");
}
// printf(" \n");
} // if(demux->audio->id==aid)
} else mp_msg(MSGT_DEMUX,MSGL_V,"Unknown 0x1BD substream: 0x%02X \n",aid);
} //if(id==0x1BD)
} else {
if(c!=0x0f){
mp_msg(MSGT_DEMUX,MSGL_V," {ERROR5,c=%d} \n",c);
return -1; // invalid packet !!!!!!
}
}
if(mpeg_pts_error) mp_msg(MSGT_DEMUX,MSGL_V," {PTS_err:%d} \n",mpeg_pts_error);
mp_dbg(MSGT_DEMUX,MSGL_DBG3," => len=%d\n",len);
// if(len<=0 || len>MAX_PS_PACKETSIZE) return -1; // Invalid packet size
if(len<=0 || len>MAX_PS_PACKETSIZE){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Invalid PS data len: %d\n",len);
return -1; // invalid packet !!!!!!
}
if(id>=0x1C0 && id<=0x1DF){
// mpeg audio
int aid=id-0x1C0;
if(!demux->a_streams[aid]) new_sh_audio(demux,aid);
if(demux->audio->id==-1) demux->audio->id=aid;
if(demux->audio->id==aid){
ds=demux->audio;
if(!ds->sh) ds->sh=demux->a_streams[aid];
}
} else
if(id>=0x1E0 && id<=0x1EF){
// mpeg video
int aid=id-0x1E0;
if(!demux->v_streams[aid]) new_sh_video(demux,aid);
if(demux->video->id==-1) demux->video->id=aid;
if(demux->video->id==aid){
ds=demux->video;
if(!ds->sh) ds->sh=demux->v_streams[aid];
}
}
if(ds){
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_MPG: Read %d data bytes from packet %04X\n",len,id);
// printf("packet start = 0x%X \n",stream_tell(demux->stream)-packet_start_pos);
ds_read_packet(ds,demux->stream,len,pts/90000.0f,demux->filepos,0);
if (demux->priv) ((mpg_demuxer_t*)demux->priv)->last_pts = pts/90000.0f;
// if(ds==demux->sub) parse_dvdsub(ds->last->buffer,ds->last->len);
return 1;
}
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_MPG: Skipping %d data bytes from packet %04X\n",len,id);
if(len<=2356) stream_skip(demux->stream,len);
return 0;
}
int num_elementary_packets100=0;
int num_elementary_packets101=0;
int num_elementary_packets12x=0;
int num_elementary_packets1B6=0;
int num_elementary_packetsPES=0;
int num_h264_slice=0; //combined slice
int num_h264_dpa=0; //DPA Slice
int num_h264_dpb=0; //DPB Slice
int num_h264_dpc=0; //DPC Slice
int num_h264_idr=0; //IDR Slice
int num_h264_sps=0;
int num_h264_pps=0;
int num_mp3audio_packets=0;
int demux_mpg_es_fill_buffer(demuxer_t *demux){
// Elementary video stream
if(demux->stream->eof) return 0;
demux->filepos=stream_tell(demux->stream);
ds_read_packet(demux->video,demux->stream,STREAM_BUFFER_SIZE,0,demux->filepos,0);
return 1;
}
int demux_mpg_fill_buffer(demuxer_t *demux){
unsigned int head=0;
int skipped=0;
int max_packs=256; // 512kbyte
int ret=0;
// System stream
do{
demux->filepos=stream_tell(demux->stream);
head=stream_read_dword(demux->stream);
if((head&0xFFFFFF00)!=0x100){
// sync...
demux->filepos-=skipped;
while(1){
int c=stream_read_char(demux->stream);
if(c<0) break; //EOF
head<<=8;
if(head!=0x100){
head|=c;
if(mp_check_mp3_header(head)) ++num_mp3audio_packets;
++skipped; //++demux->filepos;
continue;
}
head|=c;
break;
}
demux->filepos+=skipped;
}
if(stream_eof(demux->stream)) break;
// sure: head=0x000001XX
mp_dbg(MSGT_DEMUX,MSGL_DBG4,"*** head=0x%X\n",head);
if(demux->synced==0){
if(head==0x1BA) demux->synced=1; //else
// if(head==0x1BD || (head>=0x1C0 && head<=0x1EF)) demux->synced=3; // PES?
} else
if(demux->synced==1){
if(head==0x1BB || head==0x1BD || (head>=0x1C0 && head<=0x1EF)){
demux->synced=2;
mp_msg(MSGT_DEMUX,MSGL_V,"system stream synced at 0x%X (%d)!\n",demux->filepos,demux->filepos);
num_elementary_packets100=0; // requires for re-sync!
num_elementary_packets101=0; // requires for re-sync!
} else demux->synced=0;
} // else
if(demux->synced>=2){
ret=demux_mpg_read_packet(demux,head);
if(!ret)
if(--max_packs==0){
demux->stream->eof=1;
mp_msg(MSGT_DEMUX,MSGL_ERR,MSGTR_DoesntContainSelectedStream);
return 0;
}
if(demux->synced==3) demux->synced=(ret==1)?2:0; // PES detect
} else {
if(head>=0x100 && head<0x1B0){
if(head==0x100) ++num_elementary_packets100; else
if(head==0x101) ++num_elementary_packets101; else
if(head>=0x120 && head<=0x12F) ++num_elementary_packets12x;
if((head&~0x60) == 0x101) ++num_h264_slice; else
if((head&~0x60) == 0x102) ++num_h264_dpa; else
if((head&~0x60) == 0x103) ++num_h264_dpb; else
if((head&~0x60) == 0x104) ++num_h264_dpc; else
if((head&~0x60) == 0x105 && head != 0x105) ++num_h264_idr; else
if((head&~0x60) == 0x107 && head != 0x107) ++num_h264_sps; else
if((head&~0x60) == 0x108 && head != 0x108) ++num_h264_pps;
mp_msg(MSGT_DEMUX,MSGL_DBG3,"Opps... elementary video packet found: %03X\n",head);
} else
if((head>=0x1C0 && head<0x1F0) || head==0x1BD){
++num_elementary_packetsPES;
mp_msg(MSGT_DEMUX,MSGL_DBG3,"Opps... PES packet found: %03X\n",head);
} else
if(head==0x1B6) ++num_elementary_packets1B6;
#if 1
if( ( (num_elementary_packets100>50 && num_elementary_packets101>50) ||
(num_elementary_packetsPES>50) ) && skipped>4000000){
mp_msg(MSGT_DEMUX,MSGL_V,"sync_mpeg_ps: seems to be ES/PES stream...\n");
demux->stream->eof=1;
break;
}
if(num_mp3audio_packets>100 && num_elementary_packets100<10){
mp_msg(MSGT_DEMUX,MSGL_V,"sync_mpeg_ps: seems to be MP3 stream...\n");
demux->stream->eof=1;
break;
}
#endif
}
} while(ret!=1);
mp_dbg(MSGT_DEMUX,MSGL_DBG2,"demux: %d bad bytes skipped\n",skipped);
if(demux->stream->eof){
mp_msg(MSGT_DEMUX,MSGL_V,"MPEG Stream reached EOF\n");
return 0;
}
return 1;
}
extern void resync_audio_stream(sh_audio_t *sh_audio);
extern void skip_audio_frame(sh_audio_t *sh_audio);
void demux_seek_mpg(demuxer_t *demuxer,float rel_seek_secs,int flags){
demux_stream_t *d_audio=demuxer->audio;
demux_stream_t *d_video=demuxer->video;
sh_audio_t *sh_audio=d_audio->sh;
sh_video_t *sh_video=d_video->sh;
mpg_demuxer_t *mpg_d=(mpg_demuxer_t*)demuxer->priv;
int precision = 1;
float oldpts = mpg_d->last_pts;
off_t oldpos = demuxer->filepos;
float newpts = (flags & 1) ? 0.0 : oldpts;
off_t newpos = (flags & 1) ? demuxer->movi_start : oldpos;
//================= seek in MPEG ==========================
//calculate the pts to seek to
if(flags & 2) {
if (mpg_d->final_pts > 0.0)
newpts += mpg_d->final_pts * rel_seek_secs;
else
newpts += rel_seek_secs * (demuxer->movi_end - demuxer->movi_start) * oldpts / oldpos;
} else
newpts += rel_seek_secs;
if (newpts < 0) newpts = 0;
if(flags&2){
// float seek 0..1
newpos+=(demuxer->movi_end-demuxer->movi_start)*rel_seek_secs;
} else {
// time seek (secs)
if (mpg_d && mpg_d->has_valid_timestamps) {
if (mpg_d->final_pts > 0.0)
newpos += rel_seek_secs * (demuxer->movi_end - demuxer->movi_start) / mpg_d->final_pts;
else if (oldpts > 0.0)
newpos += rel_seek_secs * (oldpos - demuxer->movi_start) / oldpts;
} else if(!sh_video || !sh_video->i_bps) // unspecified or VBR
newpos+=2324*75*rel_seek_secs; // 174.3 kbyte/sec
else
newpos+=sh_video->i_bps*rel_seek_secs;
}
while (1) {
if(newpos<demuxer->movi_start){
if(demuxer->stream->type!=STREAMTYPE_VCD) demuxer->movi_start=0; // for VCD
if(newpos<demuxer->movi_start) newpos=demuxer->movi_start;
}
#ifdef _LARGEFILE_SOURCE
newpos&=~((long long)STREAM_BUFFER_SIZE-1); /* sector boundary */
#else
newpos&=~(STREAM_BUFFER_SIZE-1); /* sector boundary */
#endif
stream_seek(demuxer->stream,newpos);
// re-sync video:
videobuf_code_len=0; // reset ES stream buffer
ds_fill_buffer(d_video);
if(sh_audio){
ds_fill_buffer(d_audio);
resync_audio_stream(sh_audio);
}
while(1){
int i;
if(sh_audio && !d_audio->eof && d_video->pts && d_audio->pts){
float a_pts=d_audio->pts;
a_pts+=(ds_tell_pts(d_audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
if(d_video->pts>a_pts){
skip_audio_frame(sh_audio); // sync audio
continue;
}
}
i=sync_video_packet(d_video);
if(i==0x1B3 || i==0x1B8) break; // found it!
if(!i || !skip_video_packet(d_video)) break; // EOF?
}
if (!precision || abs(newpts - mpg_d->last_pts) < 0.5 || (mpg_d->last_pts == oldpts)) break;
if ((newpos - oldpos) * (mpg_d->last_pts - oldpts) < 0) { // invalid timestamps
mpg_d->has_valid_timestamps = 0;
break;
}
precision--;
//prepare another seek because we are off by more than 0.5s
newpos += (newpts - mpg_d->last_pts) * (newpos - oldpos) / (mpg_d->last_pts - oldpts);
ds_free_packs(d_audio);
ds_free_packs(d_video);
demuxer->stream->eof=0; // clear eof flag
d_video->eof=0;
d_audio->eof=0;
}
}
int demux_mpg_control(demuxer_t *demuxer,int cmd, void *arg){
/* demux_stream_t *d_audio=demuxer->audio;*/
demux_stream_t *d_video=demuxer->video;
/* sh_audio_t *sh_audio=d_audio->sh;*/
sh_video_t *sh_video=d_video->sh;
mpg_demuxer_t *mpg_d=(mpg_demuxer_t*)demuxer->priv;
switch(cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (mpg_d && mpg_d->has_valid_timestamps) {
*((unsigned long *)arg)=(long)mpg_d->final_pts;
return DEMUXER_CTRL_GUESS;
}
if(!sh_video || !sh_video->i_bps) // unspecified or VBR
return DEMUXER_CTRL_DONTKNOW;
*((unsigned long *)arg)=(demuxer->movi_end-demuxer->movi_start)/sh_video->i_bps;
return DEMUXER_CTRL_GUESS;
case DEMUXER_CTRL_GET_PERCENT_POS:
if (demuxer->movi_end==demuxer->movi_start)
return DEMUXER_CTRL_DONTKNOW;
if (mpg_d && mpg_d->has_valid_timestamps && mpg_d->final_pts > 0.0) {
*((int *)arg)=(int)(100 * mpg_d->last_pts / mpg_d->final_pts);
return DEMUXER_CTRL_OK;
}
*((int *)arg)=(int)((demuxer->filepos-demuxer->movi_start)/((demuxer->movi_end-demuxer->movi_start)/100));
return DEMUXER_CTRL_OK;
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
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