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131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/*
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* Apple // emulator for *nix
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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/*
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* Apple //e core sound system support. Source inspired/derived from AppleWin.
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*
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*/
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#ifndef _SOUNDCORE_H_
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#define _SOUNDCORE_H_
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#define MAX_SAMPLES (8*1024)
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#define AUDIO_STATUS_PLAYING 0x00000001
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#define AUDIO_STATUS_NOTPLAYING 0x08000000
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// AppleWin-sourced default error increment and max adjustment values ...
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#define SOUNDCORE_ERROR_INC 20
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#define SOUNDCORE_ERROR_MAX 200
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typedef struct AudioBuffer_s {
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bool bActive; // Playback is active
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bool bMute;
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long nVolume; // Current volume (as used by DirectSound)
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void *_this;
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#warning TODO rename _this variable to indicate that it is implementation_specific
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long (*SetVolume)(void* _this, long lVolume);
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long (*GetVolume)(void* _this, long *lplVolume);
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long (*GetCurrentPosition)(void* _this, unsigned long *lpdwCurrentPlayCursor, unsigned long *lpdwCurrentWriteCursor);
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long (*Stop)(void* _this);
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// This method restores the memory allocation for a lost sound buffer for the specified DirectSoundBuffer object.
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long (*Restore)(void *_this);
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long (*Play)(void* _this, unsigned long dwReserved1, unsigned long dwReserved2, unsigned long dwFlags);
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// This method obtains a valid write pointer to the sound buffer's audio data
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long (*Lock)(void* _this, unsigned long dwWriteCursor, unsigned long dwWriteBytes, INOUT int16_t **lplpvAudioPtr1, INOUT unsigned long *lpdwAudioBytes1, void **lplpvAudioPtr2, unsigned long *lpdwAudioBytes2, unsigned long dwFlags);
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// This method releases a locked sound buffer.
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long (*Unlock)(void* _this, int16_t *lpvAudioPtr1, unsigned long dwAudioBytes1, void *lpvAudioPtr2, unsigned long dwAudioBytes2);
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long (*GetStatus)(void* _this, unsigned long *lpdwStatus);
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// Mockingboard-specific HACKS
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long (*UnlockStaticBuffer)(void* _this, unsigned long dwAudioBytes);
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long (*Replay)(void* _this);
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} AudioBuffer_s;
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/*
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* Creates a sound buffer object.
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*/
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long audio_createSoundBuffer(INOUT AudioBuffer_s **audioBuffer, unsigned long bufferSize, unsigned long sampleRate, int numChannels);
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/*
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* Destroy and nullify sound buffer object.
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*/
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void audio_destroySoundBuffer(INOUT AudioBuffer_s **pVoice);
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/*
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* Prepare the audio subsystem, including the backend renderer.
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*/
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bool audio_init(void);
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/*
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* Shutdown the audio subsystem and backend renderer.
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*/
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void audio_shutdown(void);
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/*
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* Pause the audio subsystem.
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*/
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void audio_pause(void);
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/*
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* Resume the audio subsystem.
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*/
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void audio_resume(void);
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/*
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* Is the audio subsystem available?
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*/
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extern bool audio_isAvailable;
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// ----------------------------------------------------------------------------
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// Private audio backend APIs
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typedef struct AudioParams_s {
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uint16_t nChannels;
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unsigned long nSamplesPerSec;
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unsigned long nAvgBytesPerSec;
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uint16_t nBlockAlign;
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uint16_t wBitsPerSample;
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unsigned long dwBufferBytes;
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} AudioParams_s;
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typedef struct AudioContext_s {
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void *implementation_specific;
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PRIVATE long (*CreateSoundBuffer)(const AudioParams_s *params, INOUT AudioBuffer_s **buffer, const struct AudioContext_s *sound_system);
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PRIVATE long (*DestroySoundBuffer)(INOUT AudioBuffer_s **buffer);
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} AudioContext_s;
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typedef struct AudioBackend_s {
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// basic backend functionality controlled by soundcore
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PRIVATE long (*setup)(const char *sound_device, INOUT AudioContext_s **audio_context);
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PRIVATE long (*shutdown)(INOUT AudioContext_s **audio_context);
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PRIVATE long (*enumerateDevices)(INOUT char ***sound_devices, const int maxcount);
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PRIVATE long (*pause)(void);
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PRIVATE long (*resume)(void);
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} AudioBackend_s;
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// Audio backend registered at CTOR time
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PRIVATE extern AudioBackend_s *audio_backend;
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#endif /* whole file */
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