DSoundHelpers.h

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#ifndef DSOUND_HELPERS
#define DSOUND_HELPERS 1

#if defined(_WINDOWS)
#include "windows.h"
#include "wtypes.h"
#endif

struct IDirectSound;
struct IDirectSoundBuffer;

class DSound
{
        IDirectSound *ds;
        static BOOL CALLBACK EnumCallback( LPGUID lpGuid, LPCSTR lpcstrDescription, LPCSTR  lpcstrModule, LPVOID lpContext);

        void SetPrimaryBufferMode();
    
public:
        IDirectSound *GetDS() const { return ds; }
        bool IsEmulated() const;

        DSound();
        ~DSound();
        CString Init();
};

class DSoundBuf
{
public:
        enum hw { HW_HARDWARE, HW_SOFTWARE, HW_DONT_CARE };

        /* If samplerate is DYNAMIC_SAMPLERATE, then call SetSampleRate before
         * you use the sample. */
        enum { DYNAMIC_SAMPLERATE = -1 };

        DSoundBuf();
        CString Init( DSound &ds, hw hardware, 
                int channels, int samplerate, int samplebits, int writeahead );

        bool get_output_buf(char **buffer, unsigned *bufsiz, int chunksize);
        void release_output_buf(char *buffer, unsigned bufsiz);

        void Play();
        void Stop();
        void SetVolume(float vol);
        void SetSampleRate(int hz);
        int GetSampleRate() { return samplerate; }

        ~DSoundBuf();
        int64_t GetPosition() const;
        int64_t GetOutputPosition() const { return write_cursor_pos; }

private:
        int buffersize_frames() const { return buffersize / bytes_per_frame(); }
        int bytes_per_frame() const { return channels*samplebits/8; }

        void CheckWriteahead( int cursorstart, int cursorend );
        void CheckUnderrun( int cursorstart, int cursorend );

        IDirectSoundBuffer *buf;

        int channels, samplerate, samplebits, writeahead;
        int volume;

        int buffersize;
        
        int write_cursor, buffer_bytes_filled; /* bytes */
        int extra_writeahead;
        int64_t write_cursor_pos; /* frames */
        mutable int64_t LastPosition;
        bool playing;

        bool buffer_locked;
        char *locked_buf1, *locked_buf2;
        int locked_size1, locked_size2;
        char *temp_buffer;

        int last_cursors[4][2];
};

#endif

/*
 * (c) 2002-2004 Glenn Maynard
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

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