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decmpa.h

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/*  DecMPA - simple MPEG Audio decoding library.
    Copyright (C) 2002  Hauke Duden

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

        For more information look at the file License.txt in this package.

        email: hazard_hd@users.sourceforge.net
*/

#ifndef _DECMPA_H_
#define _DECMPA_H_


#ifndef DECMPA_VERSION
        
        #define DECMPA_VERSION 1

#endif

#if defined(_WINDOWS) || defined(_WIN32)

        #ifndef CALLBACK
                #include <windows.h>
        #endif
        #define DECMPA_CC CALLBACK

#else

        #define DECMPA_CC

#endif


typedef struct
{
        long (DECMPA_CC* Read)(void* pContext,void* pBuffer,long nBytes);



        int (DECMPA_CC* Seek)(void* pContext,long DestPos);
        


        long (DECMPA_CC* GetLength)(void* pContext);



        long (DECMPA_CC* GetPosition)(void* pContext);

} DecMPA_Callbacks;



typedef struct
{
        unsigned char aRawData[4];

        int bProtection;
        int nLayer;
        int nVersion;
        int bPadding;
        int nFrequencyIndex;
        int nFrequency;
        int nBitRateIndex;
        int nExtendedMode;
        int nMode;
        int bInputStereo;
        int bMPEG25;    

        int nFrameSize;
        int nDecodedSamplesPerFrame;
        int nBitRateKbps;

} DecMPA_MPEGHeader;


typedef struct
{
        int nType;

        int nFrequency;

        int nChannels;

} DecMPA_OutputFormat;


#define DECMPA_OK                                       0

#define DECMPA_END                                      1

#define DECMPA_ERROR_PARAM                      (-1)

#define DECMPA_ERROR_UNSUPPORTED        (-2)

#define DECMPA_ERROR_MEMORY                     (-3)

#define DECMPA_ERROR_INTERNAL           (-4)

#define DECMPA_ERROR_DECODE                     (-5)

#define DECMPA_ERROR_READ                       (-6)

#define DECMPA_ERROR_SEEK                       (-7)

#define DECMPA_ERROR_OPENFILE           (-8)

#define DECMPA_ERROR_WRONGSTATE         (-9)

#define DECMPA_ERROR_NOTAVAILABLE       (-10)

#define DECMPA_ERROR_INCOMPATIBLEVERSION        (-11)



#define DECMPA_PARAM_OUTPUT                     0

#define DECMPA_PARAM_PROVIDEID3V2       1

#define DECMPA_PARAMCOUNT                       2





#define DECMPA_YES      1

#define DECMPA_NO       0


#define DECMPA_OUTPUT_INT16                     0

#define DECMPA_OUTPUT_FLOAT                     1







int DECMPA_CC DecMPA_CreateUsingFile(void** ppDecoder,const char* sFilePath,int APIVersion);



int DECMPA_CC DecMPA_CreateUsingCallbacks(void** ppDecoder,const DecMPA_Callbacks* pCallbacks,void* pCallbackContext,int APIVersion);



int DECMPA_CC DecMPA_SetParam(void* pDecoder,int ID,long Value);



long DECMPA_CC DecMPA_GetParam(void* pDecoder,int ID);



int DECMPA_CC DecMPA_Decode(void* pDecoder,void* pBuffer,long nBufferBytes,long* pBytesDecoded);



int DECMPA_CC DecMPA_DecodeNoData(void* pDecoder,long* pDecodedBytes);



int DECMPA_CC DecMPA_SeekToTime(void* pDecoder,long Millis);



int DECMPA_CC DecMPA_GetTime(void* pDecoder,long* pTime);



int DECMPA_CC DecMPA_GetDuration(void* pDecoder,long* pDuration);



int DECMPA_CC DecMPA_GetOutputFormat(void* pDecoder,DecMPA_OutputFormat* pFormat);



int DECMPA_CC DecMPA_OutputFormatChanged(void* pDecoder);



int DECMPA_CC DecMPA_GetMPEGHeader(void* pDecoder,DecMPA_MPEGHeader* pHeader);



int DECMPA_CC DecMPA_GetID3v2Data(void* pDecoder,unsigned char** ppData,long* pDataSize);



void DECMPA_CC DecMPA_Destroy(void* pDecoder);


int DECMPA_CC DecMPA_GetVersion(void);

#endif

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