Esempio n. 1
0
	bool WavDecoder::Init()
	{
        DataStream* ds = m_ds;
        
		::memset(&m_format,0,sizeof(m_format));

        //LOG_DEBUG("init");
		
		/// read shunks
		while (!ds->Eof())
		{
			Byte chunk_name[4];
			if (ds->Read(chunk_name,4)!=4) break;
			UInt32 chunk_size = 0;
			if (ds->Read(reinterpret_cast<Byte*>(&chunk_size),4)!=4) break;
			
			//// "fmt "
			if (::strncmp(reinterpret_cast<const char*>(chunk_name),"fmt ",4)==0) 
			{
                //LOG_DEBUG("found chunk 'fmt '");

				if (chunk_size<16) return false;
				if (ds->Read(reinterpret_cast<Byte*>(&m_format),sizeof(m_format))!=sizeof(m_format)) return false;
				//endian_fix(&m_format);
				/// uncompressed PCM
				if (m_format.compression_code!=1) return false;
				if (m_format.num_channels!=1 && m_format.num_channels!=2) return false;
				if (m_format.bits_per_sample!=8 && m_format.bits_per_sample!=16) return false;
				if (m_format.num_channels == 1) {
					if (m_format.bits_per_sample==8)
						m_type = SAMPLE_TYPE_MONO_8;
					else if (m_format.bits_per_sample==16)
						m_type = SAMPLE_TYPE_MONO_16;
				} else if (m_format.num_channels == 2) {
					if (m_format.bits_per_sample==8)
						m_type = SAMPLE_TYPE_STEREO_8;
					else if (m_format.bits_per_sample==16)
						m_type = SAMPLE_TYPE_STEREO_16;
				}
				m_freq = m_format.sample_rate;
                assert(chunk_size>=UInt32(sizeof(m_format)));
				m_ds->Seek(chunk_size-UInt32(sizeof(m_format)),F_SEEK_CURRENT);
			} 
			/// "data"
			else if (::strncmp(reinterpret_cast<const char*>(chunk_name),"data",4)==0) 
			{
                //LOG_DEBUG("found chunk 'data'");
				m_samples+=chunk_size/m_format.block_align;
                assert(chunk_size<=std::numeric_limits<Int32>::max());
				m_ds->Seek(chunk_size,F_SEEK_CURRENT);
			}
			/// another
			else
			{
				LOG_DEBUG("skip shunk '"<<chunk_name[0]<<chunk_name[1]<<chunk_name[2]<<chunk_name[3]<<"' "<< chunk_size << " bytes");
                assert(chunk_size<=std::numeric_limits<Int32>::max());
				m_ds->Seek(chunk_size,F_SEEK_CURRENT);
			}
		}
		m_ds->Seek(4+4+4,F_SEEK_BEGIN);
		m_unreaded = 0;
		return m_samples!=0 && m_type!=SAMPLE_TYPE_UNKNOWN && m_freq!=0;
	}
Esempio n. 2
0
 void LoadBuffer() {
     size = strm->Read(buffer,size);
     readed = 0;
     if (size==0 && strm->Eof())
         eof = true;
 }