Method _init

Engine/source/core/ogg/oggTheoraDecoder.cpp:157–213

//-----------------------------------------------------------------------------

bool OggTheoraDecoder::_init()
{
   ogg_packet nextPacket;
   
   // Read header packets.
   
   bool haveTheoraHeader = true;
   while( 1 )
   {
      if( !_readNextPacket( &nextPacket ) )
      {
         haveTheoraHeader = false;
         break;
      }
      
      S32 result = th_decode_headerin( &mTheoraInfo, &mTheoraComment, &mTheoraSetup, &nextPacket );
      if( result < 0 )
      {
         haveTheoraHeader = false;
         break;
      }
      else if( result == 0 )
         break;
   }
   
   // Fail if we have no valid and complete Theora header.
      
   if( !haveTheoraHeader )
   {
      th_comment_clear( &mTheoraComment );
      th_info_clear( &mTheoraInfo );
      
      Con::errorf( "OggTheoraDecoder::_init() - incorrect or corrupt Theora headers" );
      
      return false;
   }

   // Init the decoder.
   
   mTheoraDecoder = th_decode_alloc( &mTheoraInfo, mTheoraSetup );
   
   // Feed the first video packet to the decoder.
   
   ogg_int64_t granulePos;
   th_decode_packetin( mTheoraDecoder, &nextPacket, &granulePos );
   
   mCurrentFrameTime = th_granule_time( mTheoraDecoder, granulePos );
   mCurrentFrameNumber = 0;
   mFrameDuration = 1.f / getFramesPerSecond();
   
   // Make sure we have a valid pitch.
   
   if( !mPacketFormat.mPitch )
      mPacketFormat.mPitch = getFrameWidth() * GFXFormatInfo( mPacketFormat.mFormat ).getBytesPerPixel();
      
   return true;
}