ALSA9Helpers.h

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#ifndef ALSA9_HELPERS_H
#define ALSA9_HELPERS_H

#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
#include <alsa/asoundlib.h>

#include "SDL_types.h"

class Alsa9Buf
{
private:
        int channels, samplerate, samplebits;
        int buffersize;
        int64_t last_cursor_pos;
        bool samplerate_set_explicitly;

        snd_pcm_uframes_t preferred_writeahead, preferred_chunksize;
        snd_pcm_uframes_t writeahead, chunksize;

        snd_pcm_t *pcm;

        bool Recover( int r );
        bool SetHWParams();
        bool SetSWParams();

        static void ErrorHandler(const char *file, int line, const char *function, int err, const char *fmt, ...);
                
public:
        static void InitializeErrorHandler();
        static void GetSoundCardDebugInfo();
        static CString GetHardwareID( CString name="" );
                
        enum hw { HW_HARDWARE, HW_SOFTWARE, HW_DONT_CARE };

        /* Call SetSampleRate before you use the sample. */
        Alsa9Buf();
        CString Init( hw hardware, int channels );
        ~Alsa9Buf();
        
        int GetNumFramesToFill();
        bool WaitUntilFramesCanBeFilled( int timeout_ms );
        void Write( const int16_t *buffer, int frames );
        unsigned FindSampleRate( unsigned rate );
        
        void Play();
        void Stop();
        void SetVolume(float vol);
        void SetSampleRate(int hz);
        int GetSampleRate() const { return samplerate; }

        void SetWriteahead( snd_pcm_sframes_t frames );
        void SetChunksize( snd_pcm_sframes_t frames );
        void LogParams();
        
        int64_t GetPosition() const;
        int64_t GetPlayPos() const { return last_cursor_pos; }
};
#endif

/*
 * (c) 2002-2004 Glenn Maynard, Aaron VonderHaar
 * 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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