mirror of
https://github.com/Ryujinx/SDL.git
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139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#ifndef _SDL_sysaudio_h
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#define _SDL_sysaudio_h
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#include "SDL_mutex.h"
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#include "SDL_thread.h"
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/* The SDL audio driver */
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typedef struct SDL_AudioDevice SDL_AudioDevice;
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#define _THIS SDL_AudioDevice *_this
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/* Used by audio targets during DetectDevices() */
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typedef void (*SDL_AddAudioDevice)(const char *name);
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typedef struct SDL_AudioDriverImpl
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{
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void (*DetectDevices) (int iscapture, SDL_AddAudioDevice addfn);
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int (*OpenDevice) (_THIS, const char *devname, int iscapture);
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void (*ThreadInit) (_THIS); /* Called by audio thread at start */
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void (*WaitDevice) (_THIS);
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void (*PlayDevice) (_THIS);
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Uint8 *(*GetDeviceBuf) (_THIS);
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void (*WaitDone) (_THIS);
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void (*CloseDevice) (_THIS);
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void (*LockDevice) (_THIS);
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void (*UnlockDevice) (_THIS);
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void (*Deinitialize) (void);
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/* !!! FIXME: add pause(), so we can optimize instead of mixing silence. */
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/* Some flags to push duplicate code into the core and reduce #ifdefs. */
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int ProvidesOwnCallbackThread;
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int SkipMixerLock; /* !!! FIXME: do we need this anymore? */
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int HasCaptureSupport;
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int OnlyHasDefaultOutputDevice;
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int OnlyHasDefaultInputDevice;
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} SDL_AudioDriverImpl;
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typedef struct SDL_AudioDriver
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{
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/* * * */
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/* The name of this audio driver */
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const char *name;
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/* * * */
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/* The description of this audio driver */
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const char *desc;
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SDL_AudioDriverImpl impl;
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char **outputDevices;
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int outputDeviceCount;
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char **inputDevices;
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int inputDeviceCount;
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} SDL_AudioDriver;
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/* Streamer */
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typedef struct
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{
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Uint8 *buffer;
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int max_len; /* the maximum length in bytes */
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int read_pos, write_pos; /* the position of the write and read heads in bytes */
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} SDL_AudioStreamer;
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/* Define the SDL audio driver structure */
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struct SDL_AudioDevice
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{
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/* * * */
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/* Data common to all devices */
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/* The current audio specification (shared with audio thread) */
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SDL_AudioSpec spec;
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/* An audio conversion block for audio format emulation */
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SDL_AudioCVT convert;
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/* The streamer, if sample rate conversion necessitates it */
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int use_streamer;
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SDL_AudioStreamer streamer;
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/* Current state flags */
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int iscapture;
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int enabled;
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int paused;
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int opened;
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/* Fake audio buffer for when the audio hardware is busy */
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Uint8 *fake_stream;
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/* A semaphore for locking the mixing buffers */
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SDL_mutex *mixer_lock;
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/* A thread to feed the audio device */
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SDL_Thread *thread;
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SDL_threadID threadid;
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/* * * */
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/* Data private to this driver */
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struct SDL_PrivateAudioData *hidden;
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};
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#undef _THIS
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typedef struct AudioBootStrap
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{
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const char *name;
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const char *desc;
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int (*init) (SDL_AudioDriverImpl * impl);
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int demand_only; /* 1==request explicitly, or it won't be available. */
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} AudioBootStrap;
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#endif /* _SDL_sysaudio_h */
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/* vi: set ts=4 sw=4 expandtab: */
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