Glenn Maynard
bed5872199
use poll() many systems (even 2.4) can now handle much smaller writeaheads with software mixing
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#ifndef ALSA9_HELPERS_H
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#define ALSA9_HELPERS_H
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#include <alsa/asoundlib.h>
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#include "SDL_types.h"
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class Alsa9Buf
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{
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private:
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int channels, samplerate, samplebits;
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int buffersize;
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int64_t last_cursor_pos;
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bool samplerate_set_explicitly;
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snd_pcm_uframes_t writeahead, chunksize;
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snd_pcm_t *pcm;
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bool Recover( int r );
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bool SetHWParams();
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bool SetSWParams();
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static void ErrorHandler(const char *file, int line, const char *function, int err, const char *fmt, ...);
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public:
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static void InitializeErrorHandler();
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static void GetSoundCardDebugInfo();
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static CString GetHardwareID( CString name="" );
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enum hw { HW_HARDWARE, HW_SOFTWARE, HW_DONT_CARE };
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/* Call SetSampleRate before you use the sample. */
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Alsa9Buf( hw hardware, int channels );
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~Alsa9Buf();
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int GetNumFramesToFill();
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bool WaitUntilFramesCanBeFilled( int timeout_ms );
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void Write( const Sint16 *buffer, int frames );
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unsigned FindSampleRate( unsigned rate );
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void Play();
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void Stop();
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void SetVolume(float vol);
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void SetSampleRate(int hz);
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int GetSampleRate() const { return samplerate; }
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void SetWriteahead( snd_pcm_sframes_t frames );
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void SetChunksize( snd_pcm_sframes_t frames );
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int64_t GetPosition() const;
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int64_t GetPlayPos() const { return last_cursor_pos; }
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};
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#endif
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