This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_sysaudio.h
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Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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.
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*/
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#include "SDL_config.h"
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#ifndef _SDL_sysaudio_h
#define _SDL_sysaudio_h
#include "SDL_mutex.h"
#include "SDL_thread.h"
/* The SDL audio driver */
typedef struct SDL_AudioDevice SDL_AudioDevice;
#define _THIS SDL_AudioDevice *_this
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typedef struct SDL_AudioDriverImpl
{
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int (*DetectDevices) (int iscapture);
const char *(*GetDeviceName) (int index, int iscapture);
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int (*OpenDevice) (_THIS, const char *devname, int iscapture);
void (*ThreadInit) (_THIS); /* Called by audio thread at start */
void (*WaitDevice) (_THIS);
void (*PlayDevice) (_THIS);
Uint8 *(*GetDeviceBuf) (_THIS);
void (*WaitDone) (_THIS);
void (*CloseDevice) (_THIS);
void (*LockDevice) (_THIS);
void (*UnlockDevice) (_THIS);
void (*Deinitialize) (void);
/* Some flags to push duplicate code into the core and reduce #ifdefs. */
int ProvidesOwnCallbackThread:1;
int SkipMixerLock:1;
int HasCaptureSupport:1;
int OnlyHasDefaultOutputDevice:1;
int OnlyHasDefaultInputDevice:1;
} SDL_AudioDriverImpl;
typedef struct SDL_AudioDriver
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{
/* * * */
/* The name of this audio driver */
const char *name;
/* * * */
/* The description of this audio driver */
const char *desc;
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SDL_AudioDriverImpl impl;
} SDL_AudioDriver;
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/* Streamer */
typedef struct
{
Uint8 *buffer;
int max_len; /* the maximum length in bytes */
int read_pos, write_pos; /* the position of the write and read heads in bytes */
} SDL_AudioStreamer;
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/* Define the SDL audio driver structure */
struct SDL_AudioDevice
{
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/* * * */
/* Data common to all devices */
/* The current audio specification (shared with audio thread) */
SDL_AudioSpec spec;
/* An audio conversion block for audio format emulation */
SDL_AudioCVT convert;
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/* The streamer, if sample rate conversion necessitates it */
int use_streamer;
SDL_AudioStreamer streamer;
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/* Current state flags */
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int enabled;
int paused;
int opened;
/* Fake audio buffer for when the audio hardware is busy */
Uint8 *fake_stream;
/* A semaphore for locking the mixing buffers */
SDL_mutex *mixer_lock;
/* A thread to feed the audio device */
SDL_Thread *thread;
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SDL_threadID threadid;
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/* * * */
/* Data private to this driver */
struct SDL_PrivateAudioData *hidden;
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};
#undef _THIS
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typedef struct AudioBootStrap
{
const char *name;
const char *desc;
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int (*init) (SDL_AudioDriverImpl * impl);
int demand_only:1; /* 1==request explicitly, or it won't be available. */
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} AudioBootStrap;
#endif /* _SDL_sysaudio_h */
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/* vi: set ts=4 sw=4 expandtab: */