CWavSubDecoderMSADPCM.h

#ifndef _SKYLICHTAUDIO_WAVESUBDECODER_MSADPCM_
#define _SKYLICHTAUDIO_WAVESUBDECODER_MSADPCM_
 
#include "IWavSubDecoder.h"
 
#define MAX_INT16 32767
#define MIN_INT16 -32768
#define MS_ADPCM_MONO_HEADER_SIZE   7
#define MS_ADPCM_STEREO_HEADER_SIZE 14
 
namespace Skylicht
{
    namespace Audio
    {
        const int Adaptive[] =
        {
            230, 230, 230, 230, 307, 409, 512, 614,
            768, 614, 512, 409, 307, 230, 230, 230
        };
        
        const int Adaptive16[] =
        {
            230, 230, 230, 230, 307, 409, 512, 614,
            768, 614, 512, 409, 307, 230, 230, 230
        };
        
        struct SMsAdpcmState
        {
            unsigned char Predictor;
            unsigned short Delta;
            short Sample1, Sample2;
        };
        
        
        struct SFmtExtendedInfos
        {
            short Size;
            short SamplesPerBlock;
            short NumCoefficients;
            short Coefficients[256][2];
            
            SFmtExtendedInfos() :
            Size(0),
            SamplesPerBlock(0),
            NumCoefficients(0)
            {
            }
        };
        
        class CWavSubDecoderMSADPCM : public IWavSubDecoder
        {
        public:
            CWavSubDecoderMSADPCM(IStreamCursor* streamCursor, SWaveChunk* waveChunks);
            virtual ~CWavSubDecoderMSADPCM();
            
            virtual int decode(void* buffer, int size);
            
            virtual int seek(int size);
            
        protected:
            int decodeBlock(void* outbuf);
            
            short decodeSample(SMsAdpcmState* state, unsigned int code, const short* coefficient);
            
        protected:
            
            unsigned char* m_readBuffer;
            unsigned int m_totalDataBytesRead;
            int m_dataStartPosition;
            int m_samplesInBuffer;
            int m_samplesInBufferConsumed;
            unsigned int m_totalSampleDecoded;
            unsigned char* m_blockReadBuffer;
            
            SFmtExtendedInfos m_fmtExtendedInfos;
            
        };
    }
}
 
#endif