src/audio/SDL_audio.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 04 Aug 2011 01:07:09 -0400
changeset 5592 2e88d0742f4d
parent 5588 57bfc2a2a452
child 5593 ab22ca13c47f
permissions -rw-r--r--
Implemented XAudio2 target for Windows (and Xbox360, theoretically!).
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 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_config.h"
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/* Allow access to a raw mixing buffer */
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#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#include "SDL_audiomem.h"
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#include "SDL_sysaudio.h"
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#define _THIS SDL_AudioDevice *_this
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static SDL_AudioDriver current_audio;
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static SDL_AudioDevice *open_devices[16];
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/* !!! FIXME: These are wordy and unlocalized... */
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#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
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#define DEFAULT_INPUT_DEVNAME "System audio capture device"
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/*
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 * Not all of these will be compiled and linked in, but it's convenient
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 *  to have a complete list here and saves yet-another block of #ifdefs...
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 *  Please see bootstrap[], below, for the actual #ifdef mess.
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 */
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extern AudioBootStrap BSD_AUDIO_bootstrap;
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extern AudioBootStrap DSP_bootstrap;
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extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
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extern AudioBootStrap ARTS_bootstrap;
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extern AudioBootStrap ESD_bootstrap;
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extern AudioBootStrap NAS_bootstrap;
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extern AudioBootStrap XAUDIO2_bootstrap;
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extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINMM_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
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extern AudioBootStrap BEOSAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIOIPHONE_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
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extern AudioBootStrap DISKAUD_bootstrap;
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extern AudioBootStrap DUMMYAUD_bootstrap;
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extern AudioBootStrap DCAUD_bootstrap;
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extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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    &NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_XAUDIO2
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    &XAUDIO2_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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    &DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINMM
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    &WINMM_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
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    &PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BEOSAUDIO
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    &BEOSAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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    &COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIOIPHONE
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    &COREAUDIOIPHONE_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DISK
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    &DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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    &DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NDS
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    &NDSAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_FUSIONSOUND
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    &FUSIONSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ANDROID
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    &ANDROIDAUD_bootstrap,
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#endif
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    NULL
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};
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static SDL_AudioDevice *
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get_audio_device(SDL_AudioDeviceID id)
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{
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    id--;
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    if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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        SDL_SetError("Invalid audio device ID");
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        return NULL;
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    }
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    return open_devices[id];
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}
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/* stubs for audio drivers that don't need a specific entry point... */
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static int
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SDL_AudioDetectDevices_Default(int iscapture)
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{
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    return -1;
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}
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static void
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SDL_AudioThreadInit_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioWaitDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioPlayDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static Uint8 *
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SDL_AudioGetDeviceBuf_Default(_THIS)
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{
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    return NULL;
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}
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static void
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SDL_AudioWaitDone_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioCloseDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioDeinitialize_Default(void)
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{                               /* no-op. */
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}
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static int
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SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
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{
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    return 0;
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}
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static const char *
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SDL_AudioGetDeviceName_Default(int index, int iscapture)
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{
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    SDL_SetError("No such device");
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    return NULL;
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}
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static void
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SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_mutexP(device->mixer_lock);
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}
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static void
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SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_mutexV(device->mixer_lock);
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}
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static void
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finalize_audio_entry_points(void)
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{
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    /*
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     * Fill in stub functions for unused driver entry points. This lets us
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     *  blindly call them without having to check for validity first.
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     */
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#define FILL_STUB(x) \
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        if (current_audio.impl.x == NULL) { \
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            current_audio.impl.x = SDL_Audio##x##_Default; \
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        }
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    FILL_STUB(DetectDevices);
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    FILL_STUB(GetDeviceName);
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    FILL_STUB(OpenDevice);
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    FILL_STUB(ThreadInit);
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    FILL_STUB(WaitDevice);
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    FILL_STUB(PlayDevice);
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    FILL_STUB(GetDeviceBuf);
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    FILL_STUB(WaitDone);
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    FILL_STUB(CloseDevice);
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    FILL_STUB(LockDevice);
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    FILL_STUB(UnlockDevice);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* Streaming functions (for when the input and output buffer sizes are different) */
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/* Write [length] bytes from buf into the streamer */
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static void
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SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        stream->buffer[stream->write_pos] = buf[i];
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        ++stream->write_pos;
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    }
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}
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/* Read [length] bytes out of the streamer into buf */
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static void
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SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        buf[i] = stream->buffer[stream->read_pos];
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        ++stream->read_pos;
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    }
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}
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static int
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SDL_StreamLength(SDL_AudioStreamer * stream)
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{
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    return (stream->write_pos - stream->read_pos) % stream->max_len;
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}
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/* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */
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#if 0
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static int
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SDL_StreamInit(SDL_AudioStreamer * stream, int max_len, Uint8 silence)
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{
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    /* First try to allocate the buffer */
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    stream->buffer = (Uint8 *) SDL_malloc(max_len);
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    if (stream->buffer == NULL) {
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        return -1;
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    }
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    stream->max_len = max_len;
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    stream->read_pos = 0;
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    stream->write_pos = 0;
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    /* Zero out the buffer */
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    SDL_memset(stream->buffer, silence, max_len);
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    return 0;
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}
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#endif
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/* Deinitialize the stream simply by freeing the buffer */
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static void
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SDL_StreamDeinit(SDL_AudioStreamer * stream)
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{
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    if (stream->buffer != NULL) {
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        SDL_free(stream->buffer);
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    }
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}
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#if defined(ANDROID)
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#include <android/log.h>
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#endif
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/* The general mixing thread function */
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int SDLCALL
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SDL_RunAudio(void *devicep)
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{
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    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
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    Uint8 *stream;
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    int stream_len;
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    void *udata;
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    void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
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    int silence;
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    Uint32 delay;
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    /* For streaming when the buffer sizes don't match up */
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    Uint8 *istream;
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    int istream_len = 0;
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    /* The audio mixing is always a high priority thread */
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    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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    /* Perform any thread setup */
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    device->threadid = SDL_ThreadID();
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    current_audio.impl.ThreadInit(device);
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    /* Set up the mixing function */
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    fill = device->spec.callback;
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    udata = device->spec.userdata;
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    /* By default do not stream */
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    device->use_streamer = 0;
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    if (device->convert.needed) {
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        if (device->convert.src_format == AUDIO_U8) {
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            silence = 0x80;
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        } else {
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            silence = 0;
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        }
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#if 0                           /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
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        /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
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        if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
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            /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
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            stream_max_len = 2 * device->spec.size;
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            if (device->convert.len_mult > device->convert.len_div) {
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                stream_max_len *= device->convert.len_mult;
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                stream_max_len /= device->convert.len_div;
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            }
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            if (SDL_StreamInit(&device->streamer, stream_max_len, silence) <
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                0)
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                return -1;
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            device->use_streamer = 1;
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            /* istream_len should be the length of what we grab from the callback and feed to conversion,
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               so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d
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             */
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            istream_len =
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                device->spec.size * device->convert.len_div /
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                device->convert.len_mult;
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        }
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#endif
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        /* stream_len = device->convert.len; */
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        stream_len = device->spec.size;
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    } else {
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        silence = device->spec.silence;
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        stream_len = device->spec.size;
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    }
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slouken@3336
   387
    /* Calculate the delay while paused */
slouken@3336
   388
    delay = ((device->spec.samples * 1000) / device->spec.freq);
slouken@3336
   389
slouken@2716
   390
    /* Determine if the streamer is necessary here */
slouken@2716
   391
    if (device->use_streamer == 1) {
slouken@3336
   392
        /* This code is almost the same as the old code. The difference is, instead of reading
slouken@2716
   393
           directly from the callback into "stream", then converting and sending the audio off,
slouken@2716
   394
           we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device.
slouken@2716
   395
           However, reading and writing with streamer are done separately:
slouken@2716
   396
           - We only call the callback and write to the streamer when the streamer does not
slouken@2716
   397
           contain enough samples to output to the device.
slouken@2716
   398
           - We only read from the streamer and tell the device to play when the streamer
slouken@2716
   399
           does have enough samples to output.
slouken@2716
   400
           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   401
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   402
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   403
         */
slouken@2716
   404
        while (device->enabled) {
slouken@3336
   405
slouken@3336
   406
            if (device->paused) {
slouken@3336
   407
                SDL_Delay(delay);
slouken@3336
   408
                continue;
slouken@3336
   409
            }
slouken@3336
   410
slouken@2716
   411
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   412
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   413
                /* Set up istream */
slouken@2716
   414
                if (device->convert.needed) {
slouken@2716
   415
                    if (device->convert.buf) {
slouken@2716
   416
                        istream = device->convert.buf;
slouken@2716
   417
                    } else {
slouken@2716
   418
                        continue;
slouken@2716
   419
                    }
slouken@2716
   420
                } else {
slouken@3336
   421
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   422
 * a device buffer both here and below in the stream output.
slouken@3336
   423
 */
slouken@2716
   424
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   425
                    if (istream == NULL) {
slouken@2716
   426
                        istream = device->fake_stream;
slouken@2716
   427
                    }
slouken@2716
   428
                }
slouken@0
   429
slouken@2716
   430
                /* Read from the callback into the _input_ stream */
slouken@3336
   431
                SDL_mutexP(device->mixer_lock);
slouken@3336
   432
                (*fill) (udata, istream, istream_len);
slouken@3336
   433
                SDL_mutexV(device->mixer_lock);
slouken@2716
   434
slouken@2716
   435
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   436
                if (device->convert.needed) {
slouken@2716
   437
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   438
                    if (istream == NULL) {
slouken@2716
   439
                        istream = device->fake_stream;
slouken@2716
   440
                    }
slouken@2716
   441
                    /*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   442
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   443
                                    device->convert.len_cvt);
slouken@2716
   444
                } else {
slouken@2716
   445
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   446
                }
slouken@2716
   447
            }
slouken@2716
   448
slouken@2716
   449
            /* Only output audio if the streamer has enough to output */
slouken@2716
   450
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   451
                /* Set up the output stream */
slouken@2716
   452
                if (device->convert.needed) {
slouken@2716
   453
                    if (device->convert.buf) {
slouken@2716
   454
                        stream = device->convert.buf;
slouken@2716
   455
                    } else {
slouken@2716
   456
                        continue;
slouken@2716
   457
                    }
slouken@2716
   458
                } else {
slouken@2716
   459
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   460
                    if (stream == NULL) {
slouken@2716
   461
                        stream = device->fake_stream;
slouken@2716
   462
                    }
slouken@2716
   463
                }
slouken@2716
   464
slouken@2716
   465
                /* Now read from the streamer */
slouken@2716
   466
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   467
slouken@2716
   468
                /* Ready current buffer for play and change current buffer */
slouken@3336
   469
                if (stream != device->fake_stream) {
slouken@2716
   470
                    current_audio.impl.PlayDevice(device);
slouken@3096
   471
                    /* Wait for an audio buffer to become available */
slouken@3096
   472
                    current_audio.impl.WaitDevice(device);
slouken@2716
   473
                } else {
slouken@3336
   474
                    SDL_Delay(delay);
slouken@2716
   475
                }
slouken@2716
   476
            }
slouken@2716
   477
slouken@2716
   478
        }
slouken@2716
   479
    } else {
slouken@2716
   480
        /* Otherwise, do not use the streamer. This is the old code. */
slouken@2716
   481
slouken@2716
   482
        /* Loop, filling the audio buffers */
slouken@2716
   483
        while (device->enabled) {
slouken@2716
   484
slouken@3336
   485
            if (device->paused) {
slouken@3336
   486
                SDL_Delay(delay);
slouken@3336
   487
                continue;
slouken@3336
   488
            }
slouken@3336
   489
slouken@2716
   490
            /* Fill the current buffer with sound */
slouken@2716
   491
            if (device->convert.needed) {
slouken@2716
   492
                if (device->convert.buf) {
slouken@2716
   493
                    stream = device->convert.buf;
slouken@2716
   494
                } else {
slouken@2716
   495
                    continue;
slouken@2716
   496
                }
slouken@1895
   497
            } else {
slouken@2716
   498
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   499
                if (stream == NULL) {
slouken@2716
   500
                    stream = device->fake_stream;
slouken@2716
   501
                }
slouken@1895
   502
            }
slouken@2716
   503
slouken@3336
   504
            SDL_mutexP(device->mixer_lock);
slouken@3336
   505
            (*fill) (udata, stream, stream_len);
slouken@3336
   506
            SDL_mutexV(device->mixer_lock);
slouken@0
   507
slouken@2716
   508
            /* Convert the audio if necessary */
slouken@2716
   509
            if (device->convert.needed) {
slouken@2716
   510
                SDL_ConvertAudio(&device->convert);
slouken@2716
   511
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   512
                if (stream == NULL) {
slouken@2716
   513
                    stream = device->fake_stream;
slouken@2716
   514
                }
slouken@2716
   515
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   516
                           device->convert.len_cvt);
slouken@2716
   517
            }
slouken@0
   518
slouken@2716
   519
            /* Ready current buffer for play and change current buffer */
slouken@3336
   520
            if (stream != device->fake_stream) {
slouken@2716
   521
                current_audio.impl.PlayDevice(device);
slouken@3096
   522
                /* Wait for an audio buffer to become available */
slouken@3096
   523
                current_audio.impl.WaitDevice(device);
slouken@2716
   524
            } else {
slouken@3336
   525
                SDL_Delay(delay);
slouken@2716
   526
            }
slouken@1895
   527
        }
slouken@1895
   528
    }
slouken@1562
   529
slouken@1895
   530
    /* Wait for the audio to drain.. */
icculus@2049
   531
    current_audio.impl.WaitDone(device);
slouken@21
   532
slouken@2716
   533
    /* If necessary, deinit the streamer */
slouken@2716
   534
    if (device->use_streamer == 1)
slouken@2716
   535
        SDL_StreamDeinit(&device->streamer);
slouken@2716
   536
slouken@1895
   537
    return (0);
slouken@0
   538
}
slouken@0
   539
slouken@322
   540
icculus@1982
   541
static SDL_AudioFormat
slouken@1895
   542
SDL_ParseAudioFormat(const char *string)
slouken@1794
   543
{
icculus@2076
   544
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   545
    CHECK_FMT_STRING(U8);
icculus@2049
   546
    CHECK_FMT_STRING(S8);
icculus@2049
   547
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   548
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   549
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   550
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   551
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   552
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   553
    CHECK_FMT_STRING(U16);
icculus@2049
   554
    CHECK_FMT_STRING(S16);
icculus@2049
   555
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   556
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   557
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   558
    CHECK_FMT_STRING(S32);
icculus@2049
   559
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   560
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   561
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   562
    CHECK_FMT_STRING(F32);
slouken@2060
   563
#undef CHECK_FMT_STRING
icculus@2049
   564
    return 0;
slouken@1794
   565
}
slouken@1794
   566
slouken@1895
   567
int
slouken@1895
   568
SDL_GetNumAudioDrivers(void)
slouken@0
   569
{
slouken@1895
   570
    return (SDL_arraysize(bootstrap) - 1);
slouken@0
   571
}
slouken@0
   572
slouken@1895
   573
const char *
slouken@1895
   574
SDL_GetAudioDriver(int index)
slouken@0
   575
{
slouken@1895
   576
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
slouken@1895
   577
        return (bootstrap[index]->name);
slouken@1895
   578
    }
slouken@1895
   579
    return (NULL);
slouken@0
   580
}
slouken@0
   581
slouken@1895
   582
int
slouken@1895
   583
SDL_AudioInit(const char *driver_name)
slouken@0
   584
{
icculus@2049
   585
    int i = 0;
icculus@2049
   586
    int initialized = 0;
icculus@2049
   587
    int tried_to_init = 0;
slouken@0
   588
icculus@2049
   589
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   590
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   591
    }
slouken@0
   592
slouken@2060
   593
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   594
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   595
slouken@1895
   596
    /* Select the proper audio driver */
slouken@1909
   597
    if (driver_name == NULL) {
slouken@1909
   598
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   599
    }
slouken@262
   600
icculus@2049
   601
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   602
        /* make sure we should even try this driver before doing so... */
icculus@2049
   603
        const AudioBootStrap *backend = bootstrap[i];
slouken@2060
   604
        if (((driver_name) && (SDL_strcasecmp(backend->name, driver_name))) ||
slouken@2060
   605
            ((!driver_name) && (backend->demand_only))) {
icculus@2049
   606
            continue;
slouken@1895
   607
        }
icculus@2049
   608
icculus@2049
   609
        tried_to_init = 1;
slouken@2060
   610
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   611
        current_audio.name = backend->name;
icculus@2049
   612
        current_audio.desc = backend->desc;
icculus@3699
   613
        initialized = backend->init(&current_audio.impl);
slouken@1895
   614
    }
icculus@2049
   615
icculus@2049
   616
    if (!initialized) {
icculus@2049
   617
        /* specific drivers will set the error message if they fail... */
icculus@2049
   618
        if (!tried_to_init) {
slouken@1895
   619
            if (driver_name) {
icculus@3699
   620
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   621
            } else {
slouken@1895
   622
                SDL_SetError("No available audio device");
slouken@1895
   623
            }
slouken@1895
   624
        }
icculus@2049
   625
slouken@2060
   626
        SDL_memset(&current_audio, 0, sizeof(current_audio));
slouken@2060
   627
        return (-1);            /* No driver was available, so fail. */
slouken@1895
   628
    }
icculus@2049
   629
icculus@2049
   630
    finalize_audio_entry_points();
icculus@2049
   631
slouken@1895
   632
    return (0);
slouken@1895
   633
}
slouken@0
   634
slouken@1895
   635
/*
slouken@1895
   636
 * Get the current audio driver name
slouken@1895
   637
 */
slouken@1895
   638
const char *
slouken@1895
   639
SDL_GetCurrentAudioDriver()
slouken@1895
   640
{
icculus@2049
   641
    return current_audio.name;
slouken@1895
   642
}
slouken@1895
   643
icculus@2049
   644
slouken@1895
   645
int
icculus@2049
   646
SDL_GetNumAudioDevices(int iscapture)
slouken@1895
   647
{
icculus@2049
   648
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   649
        return -1;
icculus@2049
   650
    }
icculus@2049
   651
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   652
        return 0;
icculus@2049
   653
    }
slouken@1895
   654
icculus@2049
   655
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   656
        return 1;
icculus@2049
   657
    }
icculus@2049
   658
icculus@2049
   659
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   660
        return 1;
icculus@2049
   661
    }
icculus@2049
   662
icculus@2049
   663
    return current_audio.impl.DetectDevices(iscapture);
icculus@2049
   664
}
icculus@2049
   665
icculus@2049
   666
icculus@2049
   667
const char *
icculus@2049
   668
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   669
{
icculus@2049
   670
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   671
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   672
        return NULL;
icculus@2049
   673
    }
icculus@2049
   674
icculus@2049
   675
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   676
        SDL_SetError("No capture support");
icculus@2049
   677
        return NULL;
icculus@2049
   678
    }
icculus@2049
   679
icculus@2049
   680
    if (index < 0) {
icculus@2049
   681
        SDL_SetError("No such device");
icculus@2049
   682
        return NULL;
icculus@2049
   683
    }
icculus@2049
   684
icculus@2049
   685
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   686
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   687
    }
icculus@2049
   688
icculus@2049
   689
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   690
        return DEFAULT_OUTPUT_DEVNAME;
icculus@2049
   691
    }
icculus@2049
   692
icculus@2049
   693
    return current_audio.impl.GetDeviceName(index, iscapture);
icculus@2049
   694
}
icculus@2049
   695
icculus@2049
   696
icculus@2049
   697
static void
slouken@2060
   698
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   699
{
icculus@2049
   700
    device->enabled = 0;
icculus@2049
   701
    if (device->thread != NULL) {
icculus@2049
   702
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   703
    }
icculus@2049
   704
    if (device->mixer_lock != NULL) {
icculus@2049
   705
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   706
    }
icculus@2049
   707
    if (device->fake_stream != NULL) {
icculus@2049
   708
        SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   709
    }
icculus@2049
   710
    if (device->convert.needed) {
icculus@2049
   711
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   712
    }
icculus@2049
   713
    if (device->opened) {
icculus@2049
   714
        current_audio.impl.CloseDevice(device);
icculus@2049
   715
        device->opened = 0;
icculus@2049
   716
    }
icculus@2049
   717
    SDL_FreeAudioMem(device);
icculus@2049
   718
}
icculus@2049
   719
icculus@2049
   720
icculus@2049
   721
/*
icculus@2049
   722
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   723
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   724
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   725
 */
icculus@2049
   726
static int
slouken@2060
   727
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   728
{
slouken@2060
   729
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   730
icculus@2049
   731
    if (orig->callback == NULL) {
icculus@2049
   732
        SDL_SetError("SDL_OpenAudio() passed a NULL callback");
icculus@2049
   733
        return 0;
icculus@2049
   734
    }
icculus@2049
   735
icculus@2049
   736
    if (orig->freq == 0) {
icculus@2049
   737
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   738
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   739
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   740
        }
slouken@1895
   741
    }
slouken@1895
   742
icculus@2049
   743
    if (orig->format == 0) {
icculus@2049
   744
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   745
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   746
            prepared->format = AUDIO_S16;       /* a reasonable default */
icculus@2049
   747
        }
slouken@1895
   748
    }
slouken@1895
   749
icculus@2049
   750
    switch (orig->channels) {
slouken@2060
   751
    case 0:{
slouken@2060
   752
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   753
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   754
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   755
            }
slouken@2060
   756
            break;
slouken@1895
   757
        }
slouken@1895
   758
    case 1:                    /* Mono */
slouken@1895
   759
    case 2:                    /* Stereo */
slouken@1895
   760
    case 4:                    /* surround */
slouken@1895
   761
    case 6:                    /* surround with center and lfe */
slouken@1895
   762
        break;
slouken@1895
   763
    default:
icculus@2049
   764
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   765
        return 0;
slouken@1895
   766
    }
icculus@2049
   767
icculus@2049
   768
    if (orig->samples == 0) {
icculus@2049
   769
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   770
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   771
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   772
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   773
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   774
            int power2 = 1;
icculus@2049
   775
            while (power2 < samples) {
icculus@2049
   776
                power2 *= 2;
icculus@2049
   777
            }
icculus@2049
   778
            prepared->samples = power2;
slouken@1895
   779
        }
slouken@1895
   780
    }
slouken@0
   781
slouken@1895
   782
    /* Calculate the silence and size of the audio specification */
icculus@2049
   783
    SDL_CalculateAudioSpec(prepared);
slouken@0
   784
icculus@2049
   785
    return 1;
icculus@2049
   786
}
slouken@21
   787
slouken@21
   788
icculus@2049
   789
static SDL_AudioDeviceID
icculus@2049
   790
open_audio_device(const char *devname, int iscapture,
slouken@2866
   791
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   792
                  int allowed_changes, int min_id)
icculus@2049
   793
{
icculus@2049
   794
    SDL_AudioDeviceID id = 0;
slouken@2866
   795
    SDL_AudioSpec _obtained;
icculus@2049
   796
    SDL_AudioDevice *device;
slouken@2866
   797
    SDL_bool build_cvt;
icculus@2049
   798
    int i = 0;
slouken@21
   799
icculus@2049
   800
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   801
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   802
        return 0;
slouken@1895
   803
    }
slouken@21
   804
icculus@2049
   805
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   806
        SDL_SetError("No capture support");
icculus@2049
   807
        return 0;
icculus@2049
   808
    }
icculus@2049
   809
slouken@2866
   810
    if (!obtained) {
slouken@2866
   811
        obtained = &_obtained;
slouken@2866
   812
    }
slouken@2866
   813
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   814
        return 0;
icculus@2049
   815
    }
icculus@2049
   816
icculus@2049
   817
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
   818
    if (devname == NULL) {
icculus@2049
   819
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
icculus@2049
   820
    }
icculus@2049
   821
icculus@2049
   822
    /*
icculus@2049
   823
     * Catch device names at the high level for the simple case...
icculus@2049
   824
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
   825
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
   826
     *  always NULL when it hits the low level.
icculus@2049
   827
     *
icculus@2049
   828
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
   829
     *  opens of the default system device.
icculus@2049
   830
     */
icculus@2049
   831
icculus@2049
   832
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   833
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
   834
            SDL_SetError("No such device");
icculus@2049
   835
            return 0;
icculus@2049
   836
        }
icculus@2049
   837
        devname = NULL;
icculus@2049
   838
icculus@2049
   839
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   840
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
   841
                SDL_SetError("Audio device already open");
icculus@2049
   842
                return 0;
icculus@2049
   843
            }
icculus@2049
   844
        }
icculus@2049
   845
    }
icculus@2049
   846
icculus@2049
   847
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   848
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
   849
            SDL_SetError("No such device");
icculus@2049
   850
            return 0;
icculus@2049
   851
        }
icculus@2049
   852
        devname = NULL;
icculus@2049
   853
icculus@2049
   854
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   855
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
   856
                SDL_SetError("Audio device already open");
icculus@2049
   857
                return 0;
icculus@2049
   858
            }
icculus@2049
   859
        }
icculus@2049
   860
    }
icculus@2049
   861
slouken@2060
   862
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
   863
    if (device == NULL) {
icculus@2049
   864
        SDL_OutOfMemory();
icculus@2049
   865
        return 0;
icculus@2049
   866
    }
slouken@2060
   867
    SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
slouken@2866
   868
    device->spec = *obtained;
icculus@2049
   869
    device->enabled = 1;
icculus@2049
   870
    device->paused = 1;
icculus@2049
   871
    device->iscapture = iscapture;
icculus@2049
   872
icculus@2049
   873
    /* Create a semaphore for locking the sound buffers */
icculus@2049
   874
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
   875
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
   876
        if (device->mixer_lock == NULL) {
icculus@2049
   877
            close_audio_device(device);
icculus@2049
   878
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
   879
            return 0;
icculus@2049
   880
        }
icculus@2049
   881
    }
icculus@2049
   882
icculus@2049
   883
    if (!current_audio.impl.OpenDevice(device, devname, iscapture)) {
icculus@2049
   884
        close_audio_device(device);
icculus@2049
   885
        return 0;
icculus@2049
   886
    }
icculus@2049
   887
    device->opened = 1;
slouken@0
   888
slouken@1895
   889
    /* Allocate a fake audio memory buffer */
aschiffler@4865
   890
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
   891
    if (device->fake_stream == NULL) {
icculus@2049
   892
        close_audio_device(device);
slouken@1895
   893
        SDL_OutOfMemory();
icculus@2049
   894
        return 0;
slouken@1895
   895
    }
slouken@0
   896
slouken@2866
   897
    /* If the audio driver changes the buffer size, accept it */
slouken@2866
   898
    if (device->spec.samples != obtained->samples) {
slouken@2866
   899
        obtained->samples = device->spec.samples;
slouken@2866
   900
        SDL_CalculateAudioSpec(obtained);
slouken@2866
   901
    }
slouken@2866
   902
slouken@1895
   903
    /* See if we need to do any conversion */
slouken@2866
   904
    build_cvt = SDL_FALSE;
slouken@2866
   905
    if (obtained->freq != device->spec.freq) {
slouken@2866
   906
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
   907
            obtained->freq = device->spec.freq;
slouken@2866
   908
        } else {
slouken@2866
   909
            build_cvt = SDL_TRUE;
slouken@2866
   910
        }
slouken@2866
   911
    }
slouken@2866
   912
    if (obtained->format != device->spec.format) {
slouken@2866
   913
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
   914
            obtained->format = device->spec.format;
slouken@2866
   915
        } else {
slouken@2866
   916
            build_cvt = SDL_TRUE;
slouken@2866
   917
        }
slouken@2866
   918
    }
slouken@2866
   919
    if (obtained->channels != device->spec.channels) {
slouken@2866
   920
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
   921
            obtained->channels = device->spec.channels;
slouken@2866
   922
        } else {
slouken@2866
   923
            build_cvt = SDL_TRUE;
slouken@2866
   924
        }
slouken@2866
   925
    }
slouken@2866
   926
    if (build_cvt) {
slouken@1895
   927
        /* Build an audio conversion block */
icculus@2049
   928
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
   929
                              obtained->format, obtained->channels,
slouken@2866
   930
                              obtained->freq,
icculus@2049
   931
                              device->spec.format, device->spec.channels,
icculus@2049
   932
                              device->spec.freq) < 0) {
icculus@2049
   933
            close_audio_device(device);
icculus@2049
   934
            return 0;
slouken@1895
   935
        }
icculus@2049
   936
        if (device->convert.needed) {
slouken@2866
   937
            device->convert.len = (int) (((double) obtained->size) /
slouken@2060
   938
                                         device->convert.len_ratio);
icculus@2053
   939
icculus@2049
   940
            device->convert.buf =
icculus@2049
   941
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
   942
                                            device->convert.len_mult);
icculus@2049
   943
            if (device->convert.buf == NULL) {
icculus@2049
   944
                close_audio_device(device);
slouken@1895
   945
                SDL_OutOfMemory();
icculus@2049
   946
                return 0;
slouken@1895
   947
            }
slouken@1895
   948
        }
slouken@1895
   949
    }
icculus@2049
   950
icculus@2049
   951
    /* Find an available device ID and store the structure... */
slouken@2060
   952
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
   953
        if (open_devices[id] == NULL) {
icculus@2049
   954
            open_devices[id] = device;
icculus@2049
   955
            break;
icculus@2049
   956
        }
icculus@2049
   957
    }
icculus@2049
   958
icculus@2049
   959
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
   960
        SDL_SetError("Too many open audio devices");
icculus@2049
   961
        close_audio_device(device);
icculus@2049
   962
        return 0;
icculus@2049
   963
    }
icculus@2049
   964
slouken@1895
   965
    /* Start the audio thread if necessary */
icculus@2049
   966
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
   967
        /* Start the audio thread */
icculus@2049
   968
/* !!! FIXME: this is nasty. */
slouken@5086
   969
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
slouken@1330
   970
#undef SDL_CreateThread
icculus@2049
   971
        device->thread = SDL_CreateThread(SDL_RunAudio, device, NULL, NULL);
slouken@1330
   972
#else
icculus@2049
   973
        device->thread = SDL_CreateThread(SDL_RunAudio, device);
slouken@1330
   974
#endif
icculus@2049
   975
        if (device->thread == NULL) {
slouken@2060
   976
            SDL_CloseAudioDevice(id + 1);
slouken@1895
   977
            SDL_SetError("Couldn't create audio thread");
icculus@2049
   978
            return 0;
icculus@2049
   979
        }
icculus@2049
   980
    }
icculus@2049
   981
slouken@2060
   982
    return id + 1;
icculus@2049
   983
}
icculus@2049
   984
icculus@2049
   985
icculus@2049
   986
int
slouken@2866
   987
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
   988
{
icculus@2049
   989
    SDL_AudioDeviceID id = 0;
icculus@2049
   990
icculus@2049
   991
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
   992
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   993
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
slouken@1895
   994
            return (-1);
slouken@1895
   995
        }
icculus@2049
   996
    }
slouken@0
   997
icculus@2049
   998
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
   999
    if (open_devices[0] != NULL) {
icculus@2049
  1000
        SDL_SetError("Audio device is already opened");
icculus@2049
  1001
        return (-1);
slouken@1895
  1002
    }
slouken@21
  1003
slouken@2866
  1004
    if (obtained) {
slouken@2866
  1005
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1006
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1007
    } else {
slouken@2866
  1008
        id = open_audio_device(NULL, 0, desired, desired, 0, 1);
slouken@2866
  1009
    }
slouken@2060
  1010
    if (id > 1) {               /* this should never happen in theory... */
icculus@2049
  1011
        SDL_CloseAudioDevice(id);
slouken@2060
  1012
        SDL_SetError("Internal error"); /* MUST be Device ID #1! */
icculus@2049
  1013
        return (-1);
icculus@2049
  1014
    }
slouken@21
  1015
icculus@2049
  1016
    return ((id == 0) ? -1 : 0);
icculus@2049
  1017
}
icculus@2049
  1018
icculus@2049
  1019
SDL_AudioDeviceID
icculus@2049
  1020
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1021
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1022
                    int allowed_changes)
icculus@2049
  1023
{
slouken@2866
  1024
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1025
                             allowed_changes, 2);
slouken@0
  1026
}
slouken@0
  1027
slouken@3537
  1028
SDL_AudioStatus
icculus@2049
  1029
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@0
  1030
{
icculus@2049
  1031
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1032
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1033
    if (device && device->enabled) {
icculus@2049
  1034
        if (device->paused) {
slouken@1895
  1035
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1036
        } else {
slouken@1895
  1037
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1038
        }
slouken@1895
  1039
    }
slouken@1895
  1040
    return (status);
slouken@0
  1041
}
slouken@0
  1042
icculus@2049
  1043
slouken@3537
  1044
SDL_AudioStatus
icculus@2049
  1045
SDL_GetAudioStatus(void)
icculus@2049
  1046
{
icculus@2049
  1047
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1048
}
icculus@2049
  1049
icculus@2049
  1050
void
icculus@2049
  1051
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1052
{
icculus@2049
  1053
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1054
    if (device) {
icculus@2049
  1055
        device->paused = pause_on;
icculus@2049
  1056
    }
icculus@2049
  1057
}
icculus@2049
  1058
slouken@1895
  1059
void
slouken@1895
  1060
SDL_PauseAudio(int pause_on)
slouken@0
  1061
{
icculus@2049
  1062
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1063
}
slouken@0
  1064
icculus@2049
  1065
icculus@2049
  1066
void
icculus@2049
  1067
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1068
{
icculus@2049
  1069
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1070
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1071
    if (device) {
icculus@2049
  1072
        current_audio.impl.LockDevice(device);
slouken@1895
  1073
    }
slouken@0
  1074
}
slouken@0
  1075
slouken@1895
  1076
void
slouken@1895
  1077
SDL_LockAudio(void)
slouken@0
  1078
{
icculus@2049
  1079
    SDL_LockAudioDevice(1);
icculus@2049
  1080
}
slouken@0
  1081
icculus@2049
  1082
void
icculus@2049
  1083
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1084
{
slouken@1895
  1085
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1086
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1087
    if (device) {
icculus@2049
  1088
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1089
    }
slouken@0
  1090
}
slouken@0
  1091
slouken@1895
  1092
void
slouken@1895
  1093
SDL_UnlockAudio(void)
slouken@0
  1094
{
icculus@2049
  1095
    SDL_UnlockAudioDevice(1);
icculus@2049
  1096
}
slouken@0
  1097
icculus@2049
  1098
void
icculus@2049
  1099
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1100
{
icculus@2049
  1101
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1102
    if (device) {
icculus@2049
  1103
        close_audio_device(device);
slouken@2060
  1104
        open_devices[devid - 1] = NULL;
slouken@1895
  1105
    }
slouken@0
  1106
}
slouken@0
  1107
slouken@1895
  1108
void
slouken@1895
  1109
SDL_CloseAudio(void)
slouken@0
  1110
{
icculus@2049
  1111
    SDL_CloseAudioDevice(1);
slouken@0
  1112
}
slouken@0
  1113
slouken@1895
  1114
void
slouken@1895
  1115
SDL_AudioQuit(void)
slouken@0
  1116
{
icculus@2049
  1117
    SDL_AudioDeviceID i;
icculus@2049
  1118
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1119
        SDL_CloseAudioDevice(i);
icculus@2049
  1120
    }
slouken@0
  1121
icculus@2049
  1122
    /* Free the driver data */
icculus@2049
  1123
    current_audio.impl.Deinitialize();
slouken@2060
  1124
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1125
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1126
}
slouken@0
  1127
icculus@1982
  1128
#define NUM_FORMATS 10
slouken@0
  1129
static int format_idx;
slouken@0
  1130
static int format_idx_sub;
icculus@1982
  1131
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1132
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1133
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1134
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1135
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1136
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1137
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1138
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1139
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1140
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1141
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1142
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1143
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1144
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1145
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1146
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1147
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1148
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1149
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1150
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1151
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1152
};
slouken@0
  1153
icculus@1982
  1154
SDL_AudioFormat
icculus@1982
  1155
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1156
{
slouken@1895
  1157
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1158
        if (format_list[format_idx][0] == format) {
slouken@1895
  1159
            break;
slouken@1895
  1160
        }
slouken@1895
  1161
    }
slouken@1895
  1162
    format_idx_sub = 0;
slouken@1895
  1163
    return (SDL_NextAudioFormat());
slouken@0
  1164
}
slouken@0
  1165
icculus@1982
  1166
SDL_AudioFormat
slouken@1895
  1167
SDL_NextAudioFormat(void)
slouken@0
  1168
{
slouken@1895
  1169
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
slouken@1895
  1170
        return (0);
slouken@1895
  1171
    }
slouken@1895
  1172
    return (format_list[format_idx][format_idx_sub++]);
slouken@0
  1173
}
slouken@0
  1174
slouken@1895
  1175
void
slouken@1895
  1176
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1177
{
slouken@1895
  1178
    switch (spec->format) {
slouken@1895
  1179
    case AUDIO_U8:
slouken@1895
  1180
        spec->silence = 0x80;
slouken@1895
  1181
        break;
slouken@1895
  1182
    default:
slouken@1895
  1183
        spec->silence = 0x00;
slouken@1895
  1184
        break;
slouken@1895
  1185
    }
icculus@2049
  1186
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1187
    spec->size *= spec->channels;
slouken@1895
  1188
    spec->size *= spec->samples;
slouken@0
  1189
}
slouken@1895
  1190
icculus@2049
  1191
icculus@2049
  1192
/*
icculus@2049
  1193
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1194
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1195
 */
icculus@2049
  1196
void
icculus@2049
  1197
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1198
{
icculus@2049
  1199
    /* Mix the user-level audio format */
icculus@2049
  1200
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1201
    if (device != NULL) {
icculus@2049
  1202
        SDL_AudioFormat format;
icculus@2049
  1203
        if (device->convert.needed) {
icculus@2049
  1204
            format = device->convert.src_format;
icculus@2049
  1205
        } else {
icculus@2049
  1206
            format = device->spec.format;
icculus@2049
  1207
        }
icculus@2049
  1208
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1209
    }
icculus@2049
  1210
}
icculus@2049
  1211
slouken@1895
  1212
/* vi: set ts=4 sw=4 expandtab: */