mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 19:35:49 +00:00
2ba0928749
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@427 b3059339-0415-0410-9bf9-f77b7e298cf2
231 lines
6.9 KiB
C
231 lines
6.9 KiB
C
// MPG/VOB file parser for DEMUXER v2.5 by A'rpi/ESP-team
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static unsigned int read_mpeg_timestamp(stream_t *s,int c){
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int d,e;
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unsigned int pts;
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d=stream_read_word(s);
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e=stream_read_word(s);
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if( ((c&1)!=1) || ((d&1)!=1) || ((e&1)!=1) ) return 0; // invalid pts
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pts=(((c>>1)&7)<<30)|((d>>1)<<15)|(e>>1);
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if(verbose>=3) printf("{%d}",pts);
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return pts;
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}
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static char dvdaudio_table[256];
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//static unsigned int packet_start_pos=0;
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static int demux_mpg_read_packet(demuxer_t *demux,int id){
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int d;
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int len;
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unsigned char c=0;
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unsigned int pts=0;
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unsigned int dts=0;
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demux_stream_t *ds=NULL;
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if(verbose>=3) printf("demux_read_packet: %X\n",id);
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// if(id==0x1BA) packet_start_pos=stream_tell(demux->stream);
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if(id<0x1BC || id>0x1FF) return -1;
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if(id==0x1BE) return -1; // padding stream
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if(id==0x1BF) return -1; // private2
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len=stream_read_word(demux->stream);
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if(verbose>=3) printf("PACKET len=%d",len);
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if(len==0 || len>4096) return -2; // invalid packet !!!!!!
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while(len>0){ // Skip stuFFing bytes
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c=stream_read_char(demux->stream);--len;
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if(c!=0xFF)break;
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}
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if((c>>6)==1){ // Read (skip) STD scale & size value
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// printf(" STD_scale=%d",(c>>5)&1);
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d=((c&0x1F)<<8)|stream_read_char(demux->stream);
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len-=2;
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// printf(" STD_size=%d",d);
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c=stream_read_char(demux->stream);
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}
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// Read System-1 stream timestamps:
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if((c>>4)==2){
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pts=read_mpeg_timestamp(demux->stream,c);
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len-=4;
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} else
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if((c>>4)==3){
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pts=read_mpeg_timestamp(demux->stream,c);
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c=stream_read_char(demux->stream);
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if((c>>4)!=1) pts=0; //printf("{ERROR4}");
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dts=read_mpeg_timestamp(demux->stream,c);
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len-=4+1+4;
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} else
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if((c>>6)==2){
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int pts_flags;
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int hdrlen;
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// System-2 (.VOB) stream:
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if((c>>4)&3) printf("Warning! Encrypted VOB file! (DeCSS not (yet) supported)\n");
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c=stream_read_char(demux->stream); pts_flags=c>>6;
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c=stream_read_char(demux->stream); hdrlen=c;
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len-=2;
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if(verbose>=3) printf(" hdrlen=%d (len=%d)",hdrlen,len);
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if(hdrlen>len){ printf("demux_mpg: invalid header length \n"); return -1;}
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if(pts_flags==2){
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c=stream_read_char(demux->stream);
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pts=read_mpeg_timestamp(demux->stream,c);
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len-=5;hdrlen-=5;
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} else
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if(pts_flags==3){
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c=stream_read_char(demux->stream);
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pts=read_mpeg_timestamp(demux->stream,c);
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c=stream_read_char(demux->stream);
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dts=read_mpeg_timestamp(demux->stream,c);
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len-=10;hdrlen-=10;
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}
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len-=hdrlen;
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if(hdrlen>0) stream_skip(demux->stream,hdrlen); // skip header bytes
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//============== DVD Audio sub-stream ======================
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if(id==0x1BD){
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int aid=128+(stream_read_char(demux->stream)&0x7F);--len;
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if(len<3) return -1; // invalid audio packet
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if(!avi_header.a_streams[aid]) new_sh_audio(aid);
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if(demux->audio->id==-1) demux->audio->id=aid;
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if(demux->audio->id==aid){
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ds=demux->audio;
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if(!ds->sh) ds->sh=avi_header.a_streams[aid];
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// READ Packet: Skip additional audio header data:
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c=stream_read_char(demux->stream);
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c=stream_read_char(demux->stream);
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c=stream_read_char(demux->stream);
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len-=3;
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if(ds->type==-1){
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// autodetect type
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ds->type=((aid&0x70)==0x20)?2:3;
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}
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if(ds->type==2 && len>=2){
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// read PCM header
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int head;
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head=stream_read_char(demux->stream); head=c<<8;
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c=stream_read_char(demux->stream); head|=c; len-=2;
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while(len>0 && head!=0x180){
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head=c<<8;
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c=stream_read_char(demux->stream);
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head|=c;--len;
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}
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if(!len) printf("End of packet while searching for PCM header\n");
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}
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}
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}
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} else {
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//if(c!=0x0f) printf(" {ERROR5,c=%d} \n",c);
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}
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if(verbose>=3) printf(" => len=%d\n",len);
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if(len<=0 || len>4096) return -1; // Invalid packet size
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if(id>=0x1C0 && id<=0x1DF){
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// mpeg audio
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int aid=id-0x1C0;
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if(!avi_header.a_streams[aid]) new_sh_audio(aid);
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if(demux->audio->id==-1) demux->audio->id=aid;
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if(demux->audio->id==aid){
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ds=demux->audio;
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if(!ds->sh) ds->sh=avi_header.a_streams[aid];
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if(ds->type==-1) ds->type=1;
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}
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} else
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if(id>=0x1E0 && id<=0x1EF){
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// mpeg video
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int aid=id-0x1E0;
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if(!avi_header.v_streams[aid]) new_sh_video(aid);
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if(demux->video->id==-1) demux->video->id=aid;
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if(demux->video->id==aid){
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ds=demux->video;
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if(!ds->sh) ds->sh=avi_header.v_streams[aid];
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}
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}
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if(ds){
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if(verbose>=2) printf("DEMUX_MPG: Read %d data bytes from packet %04X\n",len,id);
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// printf("packet start = 0x%X \n",stream_tell(demux->stream)-packet_start_pos);
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ds_read_packet(ds,demux->stream,len,pts/90000.0f,0);
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return 1;
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}
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if(verbose>=2) printf("DEMUX_MPG: Skipping %d data bytes from packet %04X\n",len,id);
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stream_skip(demux->stream,len);
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return 0;
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}
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static int num_elementary_packets100=0;
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static int num_elementary_packets101=0;
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int demux_mpg_es_fill_buffer(demuxer_t *demux){
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//if(demux->type==DEMUXER_TYPE_MPEG_ES)
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// Elementary video stream
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if(demux->stream->eof) return 0;
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demux->filepos=stream_tell(demux->stream);
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ds_read_packet(demux->video,demux->stream,4096,0,0);
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return 1;
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}
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int demux_mpg_fill_buffer(demuxer_t *demux){
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unsigned int head=0;
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int skipped=0;
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int max_packs=128;
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int ret=0;
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// System stream
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do{
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demux->filepos=stream_tell(demux->stream);
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head=stream_read_dword(demux->stream);
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while((head&0xffffff00)!=0x00000100){
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if(stream_eof(demux->stream)) break;
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head=(head<<8)|stream_read_char(demux->stream);
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++skipped; ++demux->filepos;
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}
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if(stream_eof(demux->stream)) break;
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// sure: head=0x000001XX
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if(demux->synced==0){
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if(head==0x1BA) demux->synced=1;
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} else
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if(demux->synced==1){
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if(head==0x1BB || (head>=0x1C0 && head<=0x1EF)){
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demux->synced=2;
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if(verbose) printf("system stream synced at 0x%X (%d)!\n",demux->filepos,demux->filepos);
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} else demux->synced=0;
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} // else
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if(demux->synced==2){
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ret=demux_mpg_read_packet(demux,head);
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if(!ret)
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if(--max_packs==0){
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demux->stream->eof=1;
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printf("demux: file doesn't contain the selected audio or video stream\n");
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return 0;
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}
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} else {
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if(head>=0x100 && head<0x1B0){
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if(head==0x100)
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++num_elementary_packets100;
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else
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if(head==0x101) ++num_elementary_packets101;
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if(verbose>=3) printf("Opps... elementary video packet found: %03X\n",head);
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}
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#if 1
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if(num_elementary_packets100>50 && num_elementary_packets101>50
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&& skipped>4000000){
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if(verbose) printf("sync_mpeg_ps: seems to be ES stream...\n");
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demux->stream->eof=1;
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break;
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}
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#endif
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}
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} while(ret!=1);
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if(verbose>=2) printf("demux: %d bad bytes skipped\n",skipped);
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if(demux->stream->eof){
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if(verbose>=2) printf("MPEG Stream reached EOF\n");
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return 0;
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}
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return 1;
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}
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