src/audio/SDL_sysaudio.h
author Aaron Wishnick <schnarf@gmail.com>
Tue, 12 Aug 2008 00:50:58 +0000
branchgsoc2008_audio_resampling
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permissions -rw-r--r--
Added streamer code. I haven't yet incorporated it into SDL_RunAudio() though.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is SDL_free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.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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typedef struct SDL_AudioDriverImpl
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{
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    int (*DetectDevices) (int iscapture);
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    const char *(*GetDeviceName) (int index, int iscapture);
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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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    /* Some flags to push duplicate code into the core and reduce #ifdefs. */
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    int ProvidesOwnCallbackThread:1;
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    int SkipMixerLock:1;
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    int HasCaptureSupport:1;
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    int OnlyHasDefaultOutputDevice:1;
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    int OnlyHasDefaultInputDevice:1;
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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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} SDL_AudioDriver;
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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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    /* 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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    Uint32 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;          /* 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: */