waveheader.h

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/*
 *  Copyright (c) 2003, Metaglue Corporation
 *
 *  This software is provided 'as-is', without any express or implied warranty.
 *  In no event will the authors be held liable for any damages arising from
 *  the use of this software.
 *
 *  Permission is granted to anyone to use this software for any purpose,
 *  including commercial applications, and to alter it and redistribute it
 *  freely, subject to the following restrictions:
 *
 *    1. The origin of this software must not be misrepresented; you must
 *       not claim that you wrote the original software. If you use this
 *       software in a product, an acknowledgment in the product
 *       documentation would be appreciated but is not required.
 *  
 *    2. Altered source versions must be plainly marked as such, and must
 *       not be misrepresented as being the original software.
 *  
 *    3. This notice may not be removed or altered from any source
 *       distribution.
 */

#ifndef _waveheader_h_
#define _waveheader_h_

// DRAGONS: utterly non-portable

namespace mxflib
{
    // waveformat - a very simple wave format class

    class fourcc
    {
    public:
        inline fourcc() { memset( data, 0, 4 ); }
        inline fourcc& operator= (const fourcc & s) { memcpy( this->data, s.data, 4); return *this; }
        inline fourcc( char *const v ) { memcpy( this->data, v, 4 ); }

    private:
        char data[4];
    };

    class LEUint32
    {
    public:
        inline LEUint32() { memset( data, 0, 4 ); }
        inline LEUint32& operator= (const LEUint32 & s) { memcpy( this->data, s.data, 4); return *this; }
        inline LEUint32( const Uint32 v )
        {
            Uint32 t = v;
          data[0] = (t) & 0xff;
            data[1] = (t >>= 8) & 0xff;
            data[2] = (t >>= 8) & 0xff;
            data[3] = (t >>= 8) & 0xff;
        }
        inline operator Uint32()
        { 
            Uint32 ret = data[3];
            ( ret <<= 8 ) |= data[2];
            ( ret <<= 8 ) |= data[1];
            ( ret <<= 8 ) |= data[0];
            return ret;
        }

    private:
        unsigned char data[4];
    };

    class LEUint16
    {
    public:
        inline LEUint16() { memset( data, 0, 2 ); }
        inline LEUint16& operator= (const LEUint16 & s) { memcpy( this->data, s.data, 2); return *this; }
        inline LEUint16( const Uint16 v )
        {
            Uint16 t = v;
          data[0] = (t) & 0xff;
            data[1] = (t >>= 8) & 0xff;
        }
        inline operator Uint16()
        {
            Uint16 ret = data[1];
            ( ret <<= 8 ) |= data[0];
            return ret;
        }

    private:
        unsigned char data[2];
    };

    class waveheader_t
    {
    public:
        fourcc      fRIFF;
        LEUint32    RIFF_len;
        fourcc      fWAVE;

        fourcc      ffmt_;
        LEUint32    fmt__len;

        LEUint16    format;
        LEUint16    nchannels;
        LEUint32    samplespersec;
        LEUint32    avgbps;
        LEUint16    blockalign;
        LEUint16    bitspersample;
        LEUint16    cbsize;

        fourcc      data;
        LEUint32    data_len;

        waveheader_t( Uint16 nc =2, Uint32 sa =48000, Uint16 bi =24 )
        {
            fRIFF = fourcc( "RIFF" );
            fWAVE = fourcc( "WAVE" );

            ffmt_ = fourcc( "fmt " );
            fmt__len = sizeof( format )
                             + sizeof( nchannels )
                             + sizeof( samplespersec )
                             + sizeof( avgbps )
                             + sizeof( blockalign )
                             + sizeof( bitspersample )
                             + sizeof( cbsize );

            format = 1;
            nchannels = nc;
            samplespersec = sa;
            avgbps = sa*nc*((bi+7)/8);
            blockalign = nc*((bi+7)/8);
            bitspersample = bi;
            cbsize = 0;

            data = fourcc( "data" );
            data_len = 0;

            RIFF_len = data_len + sizeof( waveheader_t ) - sizeof( fRIFF ) - sizeof( RIFF_len );
        }

        void SetDataLength( Uint32 len )
        { 
            data_len = len;
            RIFF_len = data_len + sizeof( waveheader_t ) - sizeof( fRIFF ) - sizeof( RIFF_len );
        }
    };
}

#endif // _waveheader_h_

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