1 files changed, 135 insertions, 0 deletions
diff --git a/mpeglib/lib/oggvorbis/vorbisDecoder.cpp b/mpeglib/lib/oggvorbis/vorbisDecoder.cpp
new file mode 100644
index 00000000..24e9370d
--- /dev/null
+++ b/mpeglib/lib/oggvorbis/vorbisDecoder.cpp
@@ -0,0 +1,135 @@
+/*
+  converts ogg frames into audioFrames
+  Copyright (C) 2001  Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "vorbisDecoder.h"
+
+#ifdef OGG_VORBIS
+
+#define _VORBIS_NEED_SYNTHHEADER_1     1
+#define _VORBIS_NEED_SYNTHHEADER_2     2
+#define _VORBIS_NEED_SYNTHHEADER_3     3
+
+#define _VORBIS_DECODE_SETUP           4
+#define _VORBIS_DECODE_LOOP            5
+
+#include <iostream>
+
+using namespace std;
+
+
+VorbisDecoder::VorbisDecoder() {
+  vorbis_info_init(&vi);
+  vorbis_comment_init(&vc);
+  reset();
+}
+
+
+VorbisDecoder::~VorbisDecoder() {
+}
+
+int VorbisDecoder::hasHeader() {
+  return (initState>=_VORBIS_DECODE_LOOP);
+}
+
+int VorbisDecoder::decode(RawFrame* rawFrame,AudioFrame* dest) {
+  
+  if ((rawFrame == NULL) || (dest == NULL)) {
+    cout << "VorbisDecoder::decode NULL pointer!"<<endl;
+    exit(-1);
+  }
+  if (rawFrame->getFrameType() != _FRAME_RAW_OGG) {
+    cout << "VorbisDecoder::decode not _FRAME_RAW_OGG"<<endl;
+    exit(-1);
+  }
+
+  ogg_packet* op=(ogg_packet*) rawFrame->getData();
+  switch(initState) {
+  case _VORBIS_NEED_SYNTHHEADER_1:
+  case _VORBIS_NEED_SYNTHHEADER_2:
+  case _VORBIS_NEED_SYNTHHEADER_3:
+    cout << "_VORBIS_NEED_SYNTHHEADER:"<<initState<<endl;
+    if(vorbis_synthesis_headerin(&vi,&vc,op)<0){ 
+      /* error case; not a vorbis header */
+      fprintf(stderr,"This Ogg bitstream does not contain Vorbis "
+              "audio data.\n");
+      exit(1);
+    }
+    initState++;
+    break;
+  case _VORBIS_DECODE_SETUP:
+    cout << "_VORBIS_DECODE_SETUP"<<endl;
+    vorbis_synthesis_init(&vd,&vi); /* central decode state */
+    vorbis_block_init(&vd,&vb);     /* local state for most of the decode
+                                       so multiple block decodes can
+                                       proceed in parallel.  We could init
+                                       multiple vorbis_block structures   
+                                       for vd here */
+    initState=_VORBIS_DECODE_LOOP;
+    // yes right, we must decode the packet!
+    // so there is no break here.
+  case _VORBIS_DECODE_LOOP: {
+    if(vorbis_synthesis(&vb,op)==0) {/* test for success! */
+      vorbis_synthesis_blockin(&vd,&vb);
+    } else {
+      cout << "vorbis_synthesis error"<<endl;
+      exit(0);
+    }
+    float **pcm;
+    /*
+
+    **pcm is a multichannel float vector.  In stereo, for
+    example, pcm[0] is left, and pcm[1] is right.  samples is
+    the size of each channel.  Convert the float values
+    (-1.<=range<=1.) to whatever PCM format and write it out 
+
+    */
+    int samples=vorbis_synthesis_pcmout(&vd,&pcm);
+    if (samples > 0) {
+      int maxSamples=dest->getSize();
+      if (samples > maxSamples) {
+	cout << "more samples in vorbis than we can store"<<endl;
+	exit(0);
+      }
+      dest->clearrawdata();
+      dest->setFrameFormat(vi.channels-1,vi.rate);
+      
+      if (vi.channels == 2) {
+	dest->putFloatData(pcm[0],pcm[1],samples);
+      } else {
+	dest->putFloatData(pcm[0],NULL,samples);
+      }
+
+      vorbis_synthesis_read(&vd,samples); /* tell libvorbis how
+					     many samples we
+					     actually consumed */
+      return true;
+    }
+    
+    return false;
+  }
+  default:
+    cout << "unknown state in vorbis decoder"<<endl;
+    exit(0);
+  }
+  return false;
+}
+
+void VorbisDecoder::reset() {
+  initState=_VORBIS_NEED_SYNTHHEADER_1;
+}
+
+void VorbisDecoder::config(const char* ,const char* ,void* ) {
+  
+}
+
+#endif