[Theora-dev] problem in using libtheora in vc++

[CP Lau]

Dear Sir/Madam,

        I am trying to use Theora in VC++ as i think Theora is a very good
codec. However, when i implement the encoding and decoding parts, i get an
unexpected error when i call:

1) theora_info_clear( &encoderInfo ); after theora_encode_init(
&theoraState, &encoderInfo );
2) theora_decode_init( &theoraStateDec, &theoraInfo );

       For problem 2, i find that all the calls to theora_decode_header are
failed and it returns either -21 or -20.

       The following is the code that i am trying. Would you please have a
look and see what is going wrong with me?

Thanks a lot
Pong



theora_info_init( &encoderInfo );
  encoderInfo.frame_width          = nFrameW; //INPUT_FRAME_WIDTH;  // Must
be multiple of 16
  encoderInfo.frame_height         = nFrameH; //INPUT_FRAME_HEIGHT; // Must
be multiple of 16
  encoderInfo.width             = encoderInfo.frame_width;
  encoderInfo.height            = encoderInfo.frame_height;
  encoderInfo.offset_x           = 0;
  encoderInfo.offset_y           = 0;
  encoderInfo.fps_numerator         = 15;//INPUT_FRAMES_PER_SECOND;
  encoderInfo.fps_denominator        = 1;
  encoderInfo.aspect_numerator       = encoderInfo.width;  // Aspect =
width/height
  encoderInfo.aspect_denominator      = encoderInfo.height; //
  encoderInfo.colorspace          = OC_CS_UNSPECIFIED;
//  encoderInfo.target_bitrate        = 90000; //45000; // Anywhere between
45kbps and 2000kbps
//  encoderInfo.target_bitrate        = 45000; //45000; // Anywhere between
45kbps and 2000kbps
  encoderInfo.target_bitrate        = 45000; //45000; // Anywhere between
45kbps and 2000kbps
  encoderInfo.quality             = 10;
  encoderInfo.dropframes_p         = 0;
  encoderInfo.quick_p            = 1;
  encoderInfo.keyframe_auto_p        = 1;
  encoderInfo.keyframe_frequency      = 64;
  encoderInfo.keyframe_frequency_force   = 64;
  encoderInfo.keyframe_data_target_bitrate = encoderInfo.target_bitrate * 3
/ 2;
  encoderInfo.keyframe_auto_threshold    = 80;
  encoderInfo.keyframe_mindistance     = 8;
  encoderInfo.noise_sensitivity       = 1;
  theora_encode_init( &theoraState, &encoderInfo );
  theora_info_clear( &encoderInfo ); // i get a error here
  //
  ogg_packet headerPacket, commentPacket, tablePacket;
  theora_encode_header( &theoraState, &headerPacket );
 // COPY_WRITE_OR_TRANSMIT_PACKET( headerPacket );
  theora_comment_init( &encoderComment );
  theora_encode_comment( &encoderComment, &commentPacket );
 // COPY_WRITE_OR_TRANSMIT_PACKET( commentPacket )
  theora_comment_clear( &encoderComment );
  theora_encode_tables( &theoraState, &tablePacket );
 // COPY_WRITE_OR_TRANSMIT_PACKET( tablePacket )
  yuv.y_width   = encoderInfo.width;
  yuv.y_height  = encoderInfo.height;
  yuv.y_stride  = encoderInfo.width;
  yuv.y         = pYBuff; // yBuffer;
  yuv.uv_width  = nFrameW / 2; // INPUT_FRAME_WIDTH / 2;
  yuv.uv_height = nFrameH / 2; // INPUT_FRAME_HEIGHT / 2;
  yuv.uv_stride = yuv.uv_width;
  yuv.u         = pUBuff; // uBuffer;
  yuv.v         = pVBuff; // vBuffer;

  // DECODER INIT
  theora_info_init( &theoraInfo );
  theora_comment_init( &theoraComment );

  theora_decode_header( &theoraInfo, &theoraComment, &headerPacket );
  theora_decode_header( &theoraInfo, &theoraComment, &commentPacket );
  theora_decode_header( &theoraInfo, &theoraComment, &tablePacket );

  theora_decode_init( &theoraStateDec, &theoraInfo ); // i get an error here
as the calls to theora_decode_header are all failed
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