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-rw-r--r--demux_mpg.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/demux_mpg.c b/demux_mpg.c
new file mode 100644
index 0000000000..f276541727
--- /dev/null
+++ b/demux_mpg.c
@@ -0,0 +1,228 @@
+// MPG/VOB file parser for DEMUXER v2.5 by A'rpi/ESP-team
+
+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) ) return 0; // invalid pts
+ pts=(((c>>1)&7)<<30)|((d>>1)<<15)|(e>>1);
+ if(verbose>=3) printf("{%d}",pts);
+ return pts;
+}
+
+static char dvdaudio_table[256];
+//static unsigned int packet_start_pos=0;
+
+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;
+
+ if(verbose>=3) printf("demux_read_packet: %X\n",id);
+
+// if(id==0x1BA) packet_start_pos=stream_tell(demux->stream);
+ if(id<0x1BC || id>0x1FF) return -1;
+ if(id==0x1BE) return -1; // padding stream
+ if(id==0x1BF) return -1; // private2
+
+ len=stream_read_word(demux->stream);
+ if(verbose>=3) printf("PACKET len=%d",len);
+ if(len==0 || len>4096) return -2; // invalid packet !!!!!!
+
+ 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) printf("Warning! Encrypted VOB file! (DeCSS not (yet) supported)\n");
+ c=stream_read_char(demux->stream); pts_flags=c>>6;
+ c=stream_read_char(demux->stream); hdrlen=c;
+ len-=2;
+ if(verbose>=3) printf(" hdrlen=%d (len=%d)",hdrlen,len);
+ if(hdrlen>len) return -1; // invalid header length
+ if(pts_flags==2){
+ c=stream_read_char(demux->stream);
+ pts=read_mpeg_timestamp(demux->stream,c);
+ len-=5;hdrlen-=5;
+ } else
+ if(pts_flags==3){
+ 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)&0x7F;--len;
+ ds=demux->audio;
+ if(ds->id==-1) ds->id=aid;
+ if(!dvdaudio_table[aid]){
+ dvdaudio_table[aid]=1;
+ printf("DVD Audio format: %s ID=%d%s\n",
+ ((aid&0x70)==0x20)?"PCM":"AC3",aid,(ds->id==aid)?" CURRENT":"");
+ }
+ if(len<3) return -1; // invalid audio packet
+ if(ds->id!=aid){
+ // drop packet (not selected channel)
+ ds=NULL;
+ } else {
+ // READ Packet: Skip additional audio header data:
+ c=stream_read_char(demux->stream);
+ c=stream_read_char(demux->stream);
+ c=stream_read_char(demux->stream);
+ len-=3;
+ if(ds->type==-1){
+ // autodetect type
+ ds->type=((aid&0x70)==0x20)?2:3;
+ }
+ if(ds->type==2 && len>=2){
+ // read PCM header
+ int head;
+ head=stream_read_char(demux->stream); head=c<<8;
+ c=stream_read_char(demux->stream); head|=c; len-=2;
+ while(len>0 && head!=0x180){
+ head=c<<8;
+ c=stream_read_char(demux->stream);
+ head|=c;--len;
+ }
+ if(!len) printf("End of packet while searching for PCM header\n");
+ }
+ }
+ }
+
+ } else {
+ //if(c!=0x0f) printf(" {ERROR5,c=%d} \n",c);
+ }
+ if(verbose>=3) printf("\n");
+
+ if(len<=0 || len>4096) return -1; // Invalid packet size
+
+ if(id>=0x1C0 && id<=0x1DF){
+ // mpeg audio
+ int aid=id-0x1C0;
+ if(demux->audio->id==-1) demux->audio->id=aid;
+ if(demux->audio->id==aid){
+ ds=demux->audio;
+ if(ds->type==-1) ds->type=1;
+ }
+ } else
+ if(id>=0x1E0 && id<=0x1EF){
+ // mpeg video
+ int aid=id-0x1E0;
+ if(demux->video->id==-1) demux->video->id=aid;
+ if(demux->video->id==aid) ds=demux->video;
+ }
+
+ if(ds){
+ if(verbose>=2) printf("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,0);
+ return 1;
+ }
+ if(verbose>=2) printf("DEMUX_MPG: Skipping %d data bytes from packet %04X\n",len,id);
+ stream_skip(demux->stream,len);
+ return 0;
+}
+
+static int num_elementary_packets100=0;
+static int num_elementary_packets101=0;
+
+int demux_mpg_es_fill_buffer(demuxer_t *demux){
+//if(demux->type==DEMUXER_TYPE_MPEG_ES)
+ // Elementary video stream
+ if(demux->stream->eof) return 0;
+ demux->filepos=stream_tell(demux->stream);
+ ds_read_packet(demux->video,demux->stream,4096,0,0);
+ return 1;
+}
+
+int demux_mpg_fill_buffer(demuxer_t *demux){
+unsigned int head=0;
+int skipped=0;
+int max_packs=128;
+int ret=0;
+
+// System stream
+do{
+ demux->filepos=stream_tell(demux->stream);
+ head=stream_read_dword(demux->stream);
+ while((head&0xffffff00)!=0x00000100){
+ if(stream_eof(demux->stream)) break;
+ head=(head<<8)|stream_read_char(demux->stream);
+ ++skipped; ++demux->filepos;
+ }
+ if(stream_eof(demux->stream)) break;
+ // sure: head=0x000001XX
+ if(demux->synced==0){
+ if(head==0x1BA) demux->synced=1;
+ } else
+ if(demux->synced==1){
+ if(head==0x1BB || (head>=0x1C0 && head<=0x1EF)){
+ demux->synced=2;
+ if(verbose) printf("system stream synced at 0x%X (%d)!\n",demux->filepos,demux->filepos);
+ } 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;
+ printf("demux: file doesn't contain the selected audio or video stream\n");
+ return 0;
+ }
+ } else {
+ if(head>=0x100 && head<0x1B0){
+ if(head==0x100)
+ ++num_elementary_packets100;
+ else
+ if(head==0x101) ++num_elementary_packets101;
+ if(verbose>=3) printf("Opps... elementary video packet found: %03X\n",head);
+ }
+#if 1
+ if(num_elementary_packets100>50 && num_elementary_packets101>50
+ && skipped>4000000){
+ if(verbose) printf("sync_mpeg_ps: seems to be ES stream...\n");
+ demux->stream->eof=1;
+ break;
+ }
+#endif
+ }
+} while(ret!=1);
+ if(verbose>=2) printf("demux: %d bad bytes skipped\n",skipped);
+ if(demux->stream->eof){
+ if(verbose>=2) printf("MPEG Stream reached EOF\n");
+ return 0;
+ }
+ return 1;
+}
+
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