From d34041569e71fc9bd772354e94dc9d16061072a5 Mon Sep 17 00:00:00 2001
From: arpi_esp <arpi_esp@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sat, 24 Feb 2001 20:28:24 +0000
Subject: Initial revision

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 demux_mpg.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 228 insertions(+)
 create mode 100644 demux_mpg.c

(limited to 'demux_mpg.c')

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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