Multiplexed stream support for vorbisfile *IN PROGRESS*

Don't use it, I know for certain it's broken.

Just a commit to make switching machines easier :-)


svn path=/trunk/vorbis/; revision=13213

include/vorbis/codec.h

@@ -198,6 +198,7 @@ extern int      vorbis_bitrate_flushpacket(vorbis_dsp_state *vd,
 					   ogg_packet *op);
 
 /* Vorbis PRIMITIVES: synthesis layer *******************************/
+extern int      vorbis_synthesis_idheader(ogg_packet *op);
 extern int      vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,
 					  ogg_packet *op);
 

include/vorbis/vorbisfile.h

@@ -86,6 +86,7 @@ typedef struct OggVorbis_File {
 
 } OggVorbis_File;
 
+
 extern int ov_clear(OggVorbis_File *vf);
 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,

lib/info.c

@@ -338,6 +338,31 @@ static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
   return(OV_EBADHEADER);
 }
 
+/* Is this packet a vorbis ID header? */
+int vorbis_synthesis_idheader(ogg_packet *op){
+  oggpack_buffer opb;
+  char buffer[6];
+
+  if(op){
+    oggpack_readinit(&opb,op->packet,op->bytes);
+
+    if(!op->b_o_s)
+      return(0); /* Not the initial packet */
+
+    if(oggpack_read(&opb,8) != 1)
+      return 0; /* not an ID header */
+
+    memset(buffer,0,6);
+    _v_readstring(&opb,buffer,6);
+    if(memcmp(buffer,"vorbis",6))
+      return 0; /* not vorbis */
+
+    return 1;
+  }
+
+  return 0;
+}
+
 /* The Vorbis header is in three packets; the initial small packet in
    the first page that identifies basic parameters, a second packet
    with bitstream comments and a third packet that holds the