src/audio/SDL_audio.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 26 May 2015 21:19:23 -0400
changeset 9649 d7762e30ba24
parent 9619 b94b6d0bff0f
child 9998 f67cf37e9cd4
permissions -rw-r--r--
Stack hint should look for 0, not -1, and not care about environment variables.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2015 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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/* 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 NACLAUD_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 HAIKUAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_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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extern AudioBootStrap PSPAUD_bootstrap;
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extern AudioBootStrap SNDIO_bootstrap;
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extern AudioBootStrap EmscriptenAudio_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_SNDIO
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    &SNDIO_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_NACL
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   &NACLAUD_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_HAIKU
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    &HAIKUAUDIO_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_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_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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#if SDL_AUDIO_DRIVER_PSP
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    &PSPAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_EMSCRIPTEN
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    &EmscriptenAudio_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 void
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SDL_AudioDetectDevices_Default(void)
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{
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    /* you have to write your own implementation if these assertions fail. */
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    SDL_assert(current_audio.impl.OnlyHasDefaultOutputDevice);
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    SDL_assert(current_audio.impl.OnlyHasDefaultInputDevice || !current_audio.impl.HasCaptureSupport);
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    SDL_AddAudioDevice(SDL_FALSE, DEFAULT_OUTPUT_DEVNAME, (void *) ((size_t) 0x1));
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    if (current_audio.impl.HasCaptureSupport) {
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        SDL_AddAudioDevice(SDL_TRUE, DEFAULT_INPUT_DEVNAME, (void *) ((size_t) 0x2));
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    }
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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 int
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SDL_AudioGetPendingBytes_Default(_THIS)
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{
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    return 0;
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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 void
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SDL_AudioFreeDeviceHandle_Default(void *handle)
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{                               /* no-op. */
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}
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static int
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SDL_AudioOpenDevice_Default(_THIS, void *handle, const char *devname, int iscapture)
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{
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    return SDL_Unsupported();
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}
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static SDL_INLINE SDL_bool
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is_in_audio_device_thread(SDL_AudioDevice * device)
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{
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    /* The device thread locks the same mutex, but not through the public API.
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       This check is in case the application, in the audio callback,
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       tries to lock the thread that we've already locked from the
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       device thread...just in case we only have non-recursive mutexes. */
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return SDL_TRUE;
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    }
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    return SDL_FALSE;
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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 (!is_in_audio_device_thread(device)) {
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        SDL_LockMutex(device->mixer_lock);
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    }
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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 (!is_in_audio_device_thread(device)) {
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        SDL_UnlockMutex(device->mixer_lock);
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    }
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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(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(GetPendingBytes);
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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(FreeDeviceHandle);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* device hotplug support... */
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static int
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add_audio_device(const char *name, void *handle, SDL_AudioDeviceItem **devices, int *devCount)
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{
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    int retval = -1;
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    const size_t size = sizeof (SDL_AudioDeviceItem) + SDL_strlen(name) + 1;
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    SDL_AudioDeviceItem *item = (SDL_AudioDeviceItem *) SDL_malloc(size);
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    if (item == NULL) {
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        return -1;
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    }
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    SDL_assert(handle != NULL);  /* we reserve NULL, audio backends can't use it. */
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    item->handle = handle;
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    SDL_strlcpy(item->name, name, size - sizeof (SDL_AudioDeviceItem));
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    SDL_LockMutex(current_audio.detectionLock);
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    item->next = *devices;
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    *devices = item;
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    retval = (*devCount)++;
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    SDL_UnlockMutex(current_audio.detectionLock);
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    return retval;
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}
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static SDL_INLINE int
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add_capture_device(const char *name, void *handle)
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{
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    /* !!! FIXME: add this later. SDL_assert(current_audio.impl.HasCaptureSupport);*/
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    return add_audio_device(name, handle, &current_audio.inputDevices, &current_audio.inputDeviceCount);
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}
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static SDL_INLINE int
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add_output_device(const char *name, void *handle)
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{
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    return add_audio_device(name, handle, &current_audio.outputDevices, &current_audio.outputDeviceCount);
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}
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static void
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free_device_list(SDL_AudioDeviceItem **devices, int *devCount)
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{
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    SDL_AudioDeviceItem *item, *next;
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    for (item = *devices; item != NULL; item = next) {
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        next = item->next;
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        if (item->handle != NULL) {
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            current_audio.impl.FreeDeviceHandle(item->handle);
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        }
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        SDL_free(item);
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    }
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    *devices = NULL;
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    *devCount = 0;
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}
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/* The audio backends call this when a new device is plugged in. */
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void
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SDL_AddAudioDevice(const int iscapture, const char *name, void *handle)
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{
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    const int device_index = iscapture ? add_capture_device(name, handle) : add_output_device(name, handle);
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    if (device_index != -1) {
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        /* Post the event, if desired */
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        if (SDL_GetEventState(SDL_AUDIODEVICEADDED) == SDL_ENABLE) {
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            SDL_Event event;
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            SDL_zero(event);
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            event.adevice.type = SDL_AUDIODEVICEADDED;
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            event.adevice.which = device_index;
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            event.adevice.iscapture = iscapture;
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            SDL_PushEvent(&event);
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        }
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    }
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}
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/* The audio backends call this when a currently-opened device is lost. */
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void SDL_OpenedAudioDeviceDisconnected(SDL_AudioDevice *device)
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{
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    SDL_assert(get_audio_device(device->id) == device);
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    if (!device->enabled) {
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        return;
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    }
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    /* Ends the audio callback and mark the device as STOPPED, but the
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       app still needs to close the device to free resources. */
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    current_audio.impl.LockDevice(device);
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    device->enabled = 0;
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    current_audio.impl.UnlockDevice(device);
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    /* Post the event, if desired */
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    if (SDL_GetEventState(SDL_AUDIODEVICEREMOVED) == SDL_ENABLE) {
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        SDL_Event event;
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        SDL_zero(event);
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        event.adevice.type = SDL_AUDIODEVICEREMOVED;
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        event.adevice.which = device->id;
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        event.adevice.iscapture = device->iscapture ? 1 : 0;
icculus@9394
   385
        SDL_PushEvent(&event);
icculus@9394
   386
    }
icculus@9394
   387
}
icculus@9394
   388
icculus@9394
   389
static void
icculus@9394
   390
mark_device_removed(void *handle, SDL_AudioDeviceItem *devices, SDL_bool *removedFlag)
icculus@9394
   391
{
icculus@9394
   392
    SDL_AudioDeviceItem *item;
icculus@9394
   393
    SDL_assert(handle != NULL);
icculus@9394
   394
    for (item = devices; item != NULL; item = item->next) {
icculus@9394
   395
        if (item->handle == handle) {
icculus@9394
   396
            item->handle = NULL;
icculus@9394
   397
            *removedFlag = SDL_TRUE;
icculus@9394
   398
            return;
icculus@9393
   399
        }
icculus@9393
   400
    }
icculus@9394
   401
}
icculus@9393
   402
icculus@9394
   403
/* The audio backends call this when a device is removed from the system. */
icculus@9394
   404
void
icculus@9399
   405
SDL_RemoveAudioDevice(const int iscapture, void *handle)
icculus@9394
   406
{
icculus@9394
   407
    SDL_LockMutex(current_audio.detectionLock);
icculus@9399
   408
    if (iscapture) {
icculus@9399
   409
        mark_device_removed(handle, current_audio.inputDevices, &current_audio.captureDevicesRemoved);
icculus@9399
   410
    } else {
icculus@9399
   411
        mark_device_removed(handle, current_audio.outputDevices, &current_audio.outputDevicesRemoved);
icculus@9399
   412
    }
icculus@9394
   413
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
   414
    current_audio.impl.FreeDeviceHandle(handle);
icculus@9393
   415
}
icculus@9393
   416
icculus@9393
   417
icculus@9012
   418
icculus@9012
   419
/* buffer queueing support... */
icculus@9012
   420
icculus@9012
   421
/* this expects that you managed thread safety elsewhere. */
icculus@9012
   422
static void
icculus@9012
   423
free_audio_queue(SDL_AudioBufferQueue *buffer)
icculus@9012
   424
{
icculus@9012
   425
    while (buffer) {
icculus@9012
   426
        SDL_AudioBufferQueue *next = buffer->next;
icculus@9012
   427
        SDL_free(buffer);
icculus@9012
   428
        buffer = next;
icculus@9012
   429
    }
icculus@9012
   430
}
icculus@9012
   431
icculus@9012
   432
static void SDLCALL
icculus@9012
   433
SDL_BufferQueueDrainCallback(void *userdata, Uint8 *stream, int _len)
icculus@9012
   434
{
icculus@9012
   435
    /* this function always holds the mixer lock before being called. */
icculus@9012
   436
    Uint32 len = (Uint32) _len;
icculus@9012
   437
    SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
icculus@9012
   438
    SDL_AudioBufferQueue *buffer;
icculus@9012
   439
icculus@9012
   440
    SDL_assert(device != NULL);  /* this shouldn't ever happen, right?! */
icculus@9012
   441
    SDL_assert(_len >= 0);  /* this shouldn't ever happen, right?! */
icculus@9012
   442
icculus@9012
   443
    while ((len > 0) && ((buffer = device->buffer_queue_head) != NULL)) {
icculus@9012
   444
        const Uint32 avail = buffer->datalen - buffer->startpos;
icculus@9012
   445
        const Uint32 cpy = SDL_min(len, avail);
icculus@9012
   446
        SDL_assert(device->queued_bytes >= avail);
icculus@9012
   447
icculus@9012
   448
        SDL_memcpy(stream, buffer->data + buffer->startpos, cpy);
icculus@9012
   449
        buffer->startpos += cpy;
icculus@9012
   450
        stream += cpy;
icculus@9012
   451
        device->queued_bytes -= cpy;
icculus@9012
   452
        len -= cpy;
icculus@9012
   453
icculus@9012
   454
        if (buffer->startpos == buffer->datalen) {  /* packet is done, put it in the pool. */
icculus@9012
   455
            device->buffer_queue_head = buffer->next;
icculus@9012
   456
            SDL_assert((buffer->next != NULL) || (buffer == device->buffer_queue_tail));
icculus@9012
   457
            buffer->next = device->buffer_queue_pool;
icculus@9012
   458
            device->buffer_queue_pool = buffer;
icculus@9012
   459
        }
icculus@9012
   460
    }
icculus@9012
   461
icculus@9012
   462
    SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   463
icculus@9012
   464
    if (len > 0) {  /* fill any remaining space in the stream with silence. */
icculus@9012
   465
        SDL_assert(device->buffer_queue_head == NULL);
icculus@9012
   466
        SDL_memset(stream, device->spec.silence, len);
icculus@9012
   467
    }
icculus@9012
   468
icculus@9012
   469
    if (device->buffer_queue_head == NULL) {
icculus@9012
   470
        device->buffer_queue_tail = NULL;  /* in case we drained the queue entirely. */
icculus@9012
   471
    }
icculus@9012
   472
}
icculus@9012
   473
icculus@9012
   474
int
icculus@9012
   475
SDL_QueueAudio(SDL_AudioDeviceID devid, const void *_data, Uint32 len)
icculus@9012
   476
{
icculus@9012
   477
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   478
    const Uint8 *data = (const Uint8 *) _data;
icculus@9012
   479
    SDL_AudioBufferQueue *orighead;
icculus@9012
   480
    SDL_AudioBufferQueue *origtail;
icculus@9012
   481
    Uint32 origlen;
icculus@9012
   482
    Uint32 datalen;
icculus@9012
   483
icculus@9012
   484
    if (!device) {
icculus@9012
   485
        return -1;  /* get_audio_device() will have set the error state */
icculus@9012
   486
    }
icculus@9012
   487
icculus@9012
   488
    if (device->spec.callback != SDL_BufferQueueDrainCallback) {
icculus@9012
   489
        return SDL_SetError("Audio device has a callback, queueing not allowed");
icculus@9012
   490
    }
icculus@9012
   491
icculus@9012
   492
    current_audio.impl.LockDevice(device);
icculus@9012
   493
icculus@9012
   494
    orighead = device->buffer_queue_head;
icculus@9012
   495
    origtail = device->buffer_queue_tail;
icculus@9012
   496
    origlen = origtail ? origtail->datalen : 0;
icculus@9012
   497
icculus@9012
   498
    while (len > 0) {
icculus@9012
   499
        SDL_AudioBufferQueue *packet = device->buffer_queue_tail;
icculus@9012
   500
        SDL_assert(!packet || (packet->datalen <= SDL_AUDIOBUFFERQUEUE_PACKETLEN));
icculus@9012
   501
        if (!packet || (packet->datalen >= SDL_AUDIOBUFFERQUEUE_PACKETLEN)) {
icculus@9012
   502
            /* tail packet missing or completely full; we need a new packet. */
icculus@9012
   503
            packet = device->buffer_queue_pool;
icculus@9012
   504
            if (packet != NULL) {
icculus@9012
   505
                /* we have one available in the pool. */
icculus@9012
   506
                device->buffer_queue_pool = packet->next;
icculus@9012
   507
            } else {
icculus@9012
   508
                /* Have to allocate a new one! */
icculus@9012
   509
                packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
   510
                if (packet == NULL) {
icculus@9012
   511
                    /* uhoh, reset so we've queued nothing new, free what we can. */
icculus@9012
   512
                    if (!origtail) {
icculus@9012
   513
                        packet = device->buffer_queue_head;  /* whole queue. */
icculus@9012
   514
                    } else {
icculus@9012
   515
                        packet = origtail->next;  /* what we added to existing queue. */
icculus@9012
   516
                        origtail->next = NULL;
icculus@9012
   517
                        origtail->datalen = origlen;
icculus@9012
   518
                    }
icculus@9012
   519
                    device->buffer_queue_head = orighead;
icculus@9012
   520
                    device->buffer_queue_tail = origtail;
icculus@9012
   521
                    device->buffer_queue_pool = NULL;
icculus@9012
   522
icculus@9012
   523
                    current_audio.impl.UnlockDevice(device);
icculus@9012
   524
icculus@9012
   525
                    free_audio_queue(packet);  /* give back what we can. */
icculus@9012
   526
icculus@9012
   527
                    return SDL_OutOfMemory();
icculus@9012
   528
                }
icculus@9012
   529
            }
icculus@9012
   530
            packet->datalen = 0;
icculus@9012
   531
            packet->startpos = 0;
icculus@9012
   532
            packet->next = NULL;
icculus@9012
   533
icculus@9012
   534
            SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   535
            if (device->buffer_queue_tail == NULL) {
icculus@9012
   536
                device->buffer_queue_head = packet;
icculus@9012
   537
            } else {
icculus@9012
   538
                device->buffer_queue_tail->next = packet;
icculus@9012
   539
            }
icculus@9012
   540
            device->buffer_queue_tail = packet;
icculus@9012
   541
        }
icculus@9012
   542
icculus@9012
   543
        datalen = SDL_min(len, SDL_AUDIOBUFFERQUEUE_PACKETLEN - packet->datalen);
icculus@9012
   544
        SDL_memcpy(packet->data + packet->datalen, data, datalen);
icculus@9012
   545
        data += datalen;
icculus@9012
   546
        len -= datalen;
icculus@9012
   547
        packet->datalen += datalen;
icculus@9012
   548
        device->queued_bytes += datalen;
icculus@9012
   549
    }
icculus@9012
   550
icculus@9012
   551
    current_audio.impl.UnlockDevice(device);
icculus@9012
   552
icculus@9012
   553
    return 0;
icculus@9012
   554
}
icculus@9012
   555
icculus@9012
   556
Uint32
icculus@9012
   557
SDL_GetQueuedAudioSize(SDL_AudioDeviceID devid)
icculus@9012
   558
{
icculus@9012
   559
    Uint32 retval = 0;
icculus@9012
   560
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9032
   561
icculus@9032
   562
    /* Nothing to do unless we're set up for queueing. */
icculus@9032
   563
    if (device && (device->spec.callback == SDL_BufferQueueDrainCallback)) {
icculus@9012
   564
        current_audio.impl.LockDevice(device);
icculus@9031
   565
        retval = device->queued_bytes + current_audio.impl.GetPendingBytes(device);
icculus@9012
   566
        current_audio.impl.UnlockDevice(device);
icculus@9012
   567
    }
icculus@9012
   568
icculus@9012
   569
    return retval;
icculus@9012
   570
}
icculus@9012
   571
icculus@9012
   572
void
icculus@9012
   573
SDL_ClearQueuedAudio(SDL_AudioDeviceID devid)
icculus@9012
   574
{
icculus@9012
   575
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   576
    SDL_AudioBufferQueue *buffer = NULL;
icculus@9012
   577
    if (!device) {
icculus@9012
   578
        return;  /* nothing to do. */
icculus@9012
   579
    }
icculus@9012
   580
icculus@9012
   581
    /* Blank out the device and release the mutex. Free it afterwards. */
icculus@9012
   582
    current_audio.impl.LockDevice(device);
icculus@9012
   583
    buffer = device->buffer_queue_head;
icculus@9012
   584
    device->buffer_queue_tail = NULL;
icculus@9012
   585
    device->buffer_queue_head = NULL;
icculus@9012
   586
    device->queued_bytes = 0;
icculus@9012
   587
    current_audio.impl.UnlockDevice(device);
icculus@9012
   588
icculus@9012
   589
    free_audio_queue(buffer);
icculus@9012
   590
}
icculus@9012
   591
icculus@9012
   592
slouken@0
   593
/* The general mixing thread function */
slouken@1895
   594
int SDLCALL
icculus@2049
   595
SDL_RunAudio(void *devicep)
slouken@0
   596
{
icculus@2049
   597
    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
icculus@9398
   598
    const int silence = (int) device->spec.silence;
icculus@9398
   599
    const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
icculus@9398
   600
    const int stream_len = (device->convert.needed) ? device->convert.len : device->spec.size;
slouken@1895
   601
    Uint8 *stream;
icculus@9398
   602
    void *udata = device->spec.userdata;
icculus@9398
   603
    void (SDLCALL *fill) (void *, Uint8 *, int) = device->spec.callback;
slouken@2716
   604
slouken@5509
   605
    /* The audio mixing is always a high priority thread */
slouken@5509
   606
    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
slouken@5509
   607
slouken@1895
   608
    /* Perform any thread setup */
icculus@2049
   609
    device->threadid = SDL_ThreadID();
icculus@2049
   610
    current_audio.impl.ThreadInit(device);
slouken@0
   611
icculus@9398
   612
    /* Loop, filling the audio buffers */
icculus@9398
   613
    while (!device->shutdown) {
icculus@9398
   614
        /* Fill the current buffer with sound */
icculus@9398
   615
        if (device->convert.needed) {
icculus@9398
   616
            stream = device->convert.buf;
icculus@9398
   617
        } else if (device->enabled) {
icculus@9398
   618
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9398
   619
        } else {
icculus@9398
   620
            /* if the device isn't enabled, we still write to the
icculus@9398
   621
               fake_stream, so the app's callback will fire with
icculus@9398
   622
               a regular frequency, in case they depend on that
icculus@9398
   623
               for timing or progress. They can use hotplug
icculus@9398
   624
               now to know if the device failed. */
icculus@9398
   625
            stream = NULL;
icculus@9398
   626
        }
slouken@21
   627
icculus@9398
   628
        if (stream == NULL) {
icculus@9398
   629
            stream = device->fake_stream;
icculus@9398
   630
        }
slouken@2716
   631
icculus@9398
   632
        /* !!! FIXME: this should be LockDevice. */
icculus@9398
   633
        SDL_LockMutex(device->mixer_lock);
icculus@9398
   634
        if (device->paused) {
icculus@9398
   635
            SDL_memset(stream, silence, stream_len);
icculus@9398
   636
        } else {
icculus@9398
   637
            (*fill) (udata, stream, stream_len);
icculus@9398
   638
        }
icculus@9398
   639
        SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   640
icculus@9398
   641
        /* Convert the audio if necessary */
icculus@9398
   642
        if (device->enabled && device->convert.needed) {
icculus@9398
   643
            SDL_ConvertAudio(&device->convert);
icculus@9398
   644
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9397
   645
            if (stream == NULL) {
icculus@9397
   646
                stream = device->fake_stream;
icculus@9398
   647
            } else {
icculus@9398
   648
                SDL_memcpy(stream, device->convert.buf,
icculus@9398
   649
                           device->convert.len_cvt);
slouken@1895
   650
            }
icculus@9398
   651
        }
slouken@2716
   652
icculus@9398
   653
        /* Ready current buffer for play and change current buffer */
icculus@9398
   654
        if (stream == device->fake_stream) {
icculus@9398
   655
            SDL_Delay(delay);
icculus@9398
   656
        } else {
icculus@9398
   657
            current_audio.impl.PlayDevice(device);
icculus@9398
   658
            current_audio.impl.WaitDevice(device);
slouken@1895
   659
        }
slouken@1895
   660
    }
slouken@1562
   661
icculus@9398
   662
    /* Wait for the audio to drain. */
icculus@2049
   663
    current_audio.impl.WaitDone(device);
slouken@21
   664
icculus@9382
   665
    return 0;
slouken@0
   666
}
slouken@0
   667
slouken@322
   668
icculus@1982
   669
static SDL_AudioFormat
slouken@1895
   670
SDL_ParseAudioFormat(const char *string)
slouken@1794
   671
{
icculus@2076
   672
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   673
    CHECK_FMT_STRING(U8);
icculus@2049
   674
    CHECK_FMT_STRING(S8);
icculus@2049
   675
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   676
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   677
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   678
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   679
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   680
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   681
    CHECK_FMT_STRING(U16);
icculus@2049
   682
    CHECK_FMT_STRING(S16);
icculus@2049
   683
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   684
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   685
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   686
    CHECK_FMT_STRING(S32);
icculus@2049
   687
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   688
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   689
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   690
    CHECK_FMT_STRING(F32);
slouken@2060
   691
#undef CHECK_FMT_STRING
icculus@2049
   692
    return 0;
slouken@1794
   693
}
slouken@1794
   694
slouken@1895
   695
int
slouken@1895
   696
SDL_GetNumAudioDrivers(void)
slouken@0
   697
{
icculus@9382
   698
    return SDL_arraysize(bootstrap) - 1;
slouken@0
   699
}
slouken@0
   700
slouken@1895
   701
const char *
slouken@1895
   702
SDL_GetAudioDriver(int index)
slouken@0
   703
{
slouken@1895
   704
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
icculus@9382
   705
        return bootstrap[index]->name;
slouken@1895
   706
    }
icculus@9382
   707
    return NULL;
slouken@0
   708
}
slouken@0
   709
slouken@1895
   710
int
slouken@1895
   711
SDL_AudioInit(const char *driver_name)
slouken@0
   712
{
icculus@2049
   713
    int i = 0;
icculus@2049
   714
    int initialized = 0;
icculus@2049
   715
    int tried_to_init = 0;
slouken@0
   716
icculus@2049
   717
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   718
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   719
    }
slouken@0
   720
icculus@9392
   721
    SDL_zero(current_audio);
icculus@9392
   722
    SDL_zero(open_devices);
icculus@2049
   723
slouken@1895
   724
    /* Select the proper audio driver */
slouken@1909
   725
    if (driver_name == NULL) {
slouken@1909
   726
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   727
    }
slouken@262
   728
icculus@2049
   729
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   730
        /* make sure we should even try this driver before doing so... */
icculus@2049
   731
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   732
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   733
            (!driver_name && backend->demand_only)) {
icculus@2049
   734
            continue;
slouken@1895
   735
        }
icculus@2049
   736
icculus@2049
   737
        tried_to_init = 1;
icculus@9392
   738
        SDL_zero(current_audio);
icculus@2049
   739
        current_audio.name = backend->name;
icculus@2049
   740
        current_audio.desc = backend->desc;
icculus@3699
   741
        initialized = backend->init(&current_audio.impl);
slouken@1895
   742
    }
icculus@2049
   743
icculus@2049
   744
    if (!initialized) {
icculus@2049
   745
        /* specific drivers will set the error message if they fail... */
icculus@2049
   746
        if (!tried_to_init) {
slouken@1895
   747
            if (driver_name) {
icculus@3699
   748
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   749
            } else {
slouken@1895
   750
                SDL_SetError("No available audio device");
slouken@1895
   751
            }
slouken@1895
   752
        }
icculus@2049
   753
icculus@9392
   754
        SDL_zero(current_audio);
icculus@9382
   755
        return -1;            /* No driver was available, so fail. */
slouken@1895
   756
    }
icculus@2049
   757
icculus@9394
   758
    current_audio.detectionLock = SDL_CreateMutex();
icculus@9393
   759
icculus@2049
   760
    finalize_audio_entry_points();
icculus@2049
   761
icculus@9393
   762
    /* Make sure we have a list of devices available at startup. */
icculus@9394
   763
    current_audio.impl.DetectDevices();
icculus@9393
   764
icculus@9382
   765
    return 0;
slouken@1895
   766
}
slouken@0
   767
slouken@1895
   768
/*
slouken@1895
   769
 * Get the current audio driver name
slouken@1895
   770
 */
slouken@1895
   771
const char *
slouken@1895
   772
SDL_GetCurrentAudioDriver()
slouken@1895
   773
{
icculus@2049
   774
    return current_audio.name;
slouken@1895
   775
}
slouken@1895
   776
icculus@9394
   777
/* Clean out devices that we've removed but had to keep around for stability. */
icculus@9394
   778
static void
icculus@9394
   779
clean_out_device_list(SDL_AudioDeviceItem **devices, int *devCount, SDL_bool *removedFlag)
icculus@9394
   780
{
icculus@9394
   781
    SDL_AudioDeviceItem *item = *devices;
icculus@9394
   782
    SDL_AudioDeviceItem *prev = NULL;
icculus@9394
   783
    int total = 0;
icculus@9394
   784
icculus@9394
   785
    while (item) {
icculus@9394
   786
        SDL_AudioDeviceItem *next = item->next;
icculus@9394
   787
        if (item->handle != NULL) {
icculus@9394
   788
            total++;
icculus@9394
   789
            prev = item;
icculus@9394
   790
        } else {
icculus@9394
   791
            if (prev) {
icculus@9394
   792
                prev->next = next;
icculus@9394
   793
            } else {
icculus@9394
   794
                *devices = next;
icculus@9394
   795
            }
icculus@9394
   796
            SDL_free(item);
icculus@9394
   797
        }
icculus@9394
   798
        item = next;
icculus@9394
   799
    }
icculus@9394
   800
icculus@9394
   801
    *devCount = total;
icculus@9394
   802
    *removedFlag = SDL_FALSE;
icculus@9394
   803
}
icculus@9394
   804
icculus@9394
   805
slouken@1895
   806
int
icculus@2049
   807
SDL_GetNumAudioDevices(int iscapture)
slouken@1895
   808
{
icculus@5593
   809
    int retval = 0;
icculus@5593
   810
icculus@2049
   811
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   812
        return -1;
icculus@2049
   813
    }
icculus@5593
   814
icculus@9394
   815
    SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   816
    if (iscapture && current_audio.captureDevicesRemoved) {
icculus@9394
   817
        clean_out_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount, &current_audio.captureDevicesRemoved);
icculus@2049
   818
    }
slouken@1895
   819
icculus@9394
   820
    if (!iscapture && current_audio.outputDevicesRemoved) {
icculus@9394
   821
        clean_out_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount, &current_audio.outputDevicesRemoved);
icculus@9394
   822
        current_audio.outputDevicesRemoved = SDL_FALSE;
icculus@2049
   823
    }
icculus@2049
   824
icculus@9393
   825
    retval = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
   826
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9393
   827
icculus@5593
   828
    return retval;
icculus@2049
   829
}
icculus@2049
   830
icculus@2049
   831
icculus@2049
   832
const char *
icculus@2049
   833
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   834
{
icculus@9393
   835
    const char *retval = NULL;
icculus@9393
   836
icculus@2049
   837
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   838
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   839
        return NULL;
icculus@2049
   840
    }
icculus@2049
   841
icculus@2049
   842
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   843
        SDL_SetError("No capture support");
icculus@2049
   844
        return NULL;
icculus@2049
   845
    }
icculus@2049
   846
icculus@9394
   847
    if (index >= 0) {
icculus@9394
   848
        SDL_AudioDeviceItem *item;
icculus@9394
   849
        int i;
icculus@9394
   850
icculus@9394
   851
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   852
        item = iscapture ? current_audio.inputDevices : current_audio.outputDevices;
icculus@9394
   853
        i = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
   854
        if (index < i) {
icculus@9394
   855
            for (i--; i > index; i--, item = item->next) {
icculus@9394
   856
                SDL_assert(item != NULL);
icculus@9394
   857
            }
icculus@9394
   858
            SDL_assert(item != NULL);
icculus@9394
   859
            retval = item->name;
icculus@9394
   860
        }
icculus@9394
   861
        SDL_UnlockMutex(current_audio.detectionLock);
icculus@2049
   862
    }
icculus@2049
   863
icculus@9394
   864
    if (retval == NULL) {
icculus@9394
   865
        SDL_SetError("No such device");
icculus@2049
   866
    }
icculus@2049
   867
icculus@9394
   868
    return retval;
icculus@2049
   869
}
icculus@2049
   870
icculus@2049
   871
icculus@2049
   872
static void
slouken@2060
   873
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   874
{
icculus@2049
   875
    device->enabled = 0;
icculus@9397
   876
    device->shutdown = 1;
icculus@2049
   877
    if (device->thread != NULL) {
icculus@2049
   878
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   879
    }
icculus@2049
   880
    if (device->mixer_lock != NULL) {
icculus@2049
   881
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   882
    }
slouken@7719
   883
    SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   884
    if (device->convert.needed) {
icculus@2049
   885
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   886
    }
icculus@2049
   887
    if (device->opened) {
icculus@2049
   888
        current_audio.impl.CloseDevice(device);
icculus@2049
   889
        device->opened = 0;
icculus@2049
   890
    }
icculus@9012
   891
icculus@9012
   892
    free_audio_queue(device->buffer_queue_head);
icculus@9012
   893
    free_audio_queue(device->buffer_queue_pool);
icculus@9012
   894
icculus@2049
   895
    SDL_FreeAudioMem(device);
icculus@2049
   896
}
icculus@2049
   897
icculus@2049
   898
icculus@2049
   899
/*
icculus@2049
   900
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   901
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   902
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   903
 */
icculus@2049
   904
static int
slouken@2060
   905
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   906
{
slouken@2060
   907
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   908
icculus@2049
   909
    if (orig->freq == 0) {
icculus@2049
   910
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   911
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   912
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   913
        }
slouken@1895
   914
    }
slouken@1895
   915
icculus@2049
   916
    if (orig->format == 0) {
icculus@2049
   917
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   918
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   919
            prepared->format = AUDIO_S16;       /* a reasonable default */
icculus@2049
   920
        }
slouken@1895
   921
    }
slouken@1895
   922
icculus@2049
   923
    switch (orig->channels) {
slouken@2060
   924
    case 0:{
slouken@2060
   925
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   926
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   927
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   928
            }
slouken@2060
   929
            break;
slouken@1895
   930
        }
slouken@1895
   931
    case 1:                    /* Mono */
slouken@1895
   932
    case 2:                    /* Stereo */
slouken@1895
   933
    case 4:                    /* surround */
slouken@1895
   934
    case 6:                    /* surround with center and lfe */
slouken@1895
   935
        break;
slouken@1895
   936
    default:
icculus@2049
   937
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   938
        return 0;
slouken@1895
   939
    }
icculus@2049
   940
icculus@2049
   941
    if (orig->samples == 0) {
icculus@2049
   942
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   943
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   944
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   945
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   946
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   947
            int power2 = 1;
icculus@2049
   948
            while (power2 < samples) {
icculus@2049
   949
                power2 *= 2;
icculus@2049
   950
            }
icculus@2049
   951
            prepared->samples = power2;
slouken@1895
   952
        }
slouken@1895
   953
    }
slouken@0
   954
slouken@1895
   955
    /* Calculate the silence and size of the audio specification */
icculus@2049
   956
    SDL_CalculateAudioSpec(prepared);
slouken@0
   957
icculus@2049
   958
    return 1;
icculus@2049
   959
}
slouken@21
   960
icculus@2049
   961
static SDL_AudioDeviceID
icculus@2049
   962
open_audio_device(const char *devname, int iscapture,
slouken@2866
   963
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   964
                  int allowed_changes, int min_id)
icculus@2049
   965
{
icculus@2049
   966
    SDL_AudioDeviceID id = 0;
slouken@2866
   967
    SDL_AudioSpec _obtained;
icculus@2049
   968
    SDL_AudioDevice *device;
slouken@2866
   969
    SDL_bool build_cvt;
icculus@9394
   970
    void *handle = NULL;
icculus@9404
   971
    Uint32 stream_len;
icculus@2049
   972
    int i = 0;
slouken@21
   973
icculus@2049
   974
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   975
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   976
        return 0;
slouken@1895
   977
    }
slouken@21
   978
icculus@2049
   979
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   980
        SDL_SetError("No capture support");
icculus@2049
   981
        return 0;
icculus@2049
   982
    }
icculus@2049
   983
icculus@9393
   984
    /* Find an available device ID... */
icculus@9393
   985
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@9393
   986
        if (open_devices[id] == NULL) {
icculus@9393
   987
            break;
icculus@9393
   988
        }
icculus@9393
   989
    }
icculus@9393
   990
icculus@9393
   991
    if (id == SDL_arraysize(open_devices)) {
icculus@9393
   992
        SDL_SetError("Too many open audio devices");
icculus@9393
   993
        return 0;
icculus@9393
   994
    }
icculus@9393
   995
slouken@2866
   996
    if (!obtained) {
slouken@2866
   997
        obtained = &_obtained;
slouken@2866
   998
    }
slouken@2866
   999
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
  1000
        return 0;
icculus@2049
  1001
    }
icculus@2049
  1002
icculus@2049
  1003
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
  1004
    if (devname == NULL) {
icculus@2049
  1005
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
icculus@2049
  1006
    }
icculus@2049
  1007
icculus@2049
  1008
    /*
icculus@2049
  1009
     * Catch device names at the high level for the simple case...
icculus@2049
  1010
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
  1011
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
  1012
     *  always NULL when it hits the low level.
icculus@2049
  1013
     *
icculus@2049
  1014
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
  1015
     *  opens of the default system device.
icculus@2049
  1016
     */
icculus@2049
  1017
icculus@2049
  1018
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
  1019
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
  1020
            SDL_SetError("No such device");
icculus@2049
  1021
            return 0;
icculus@2049
  1022
        }
icculus@2049
  1023
        devname = NULL;
icculus@2049
  1024
icculus@2049
  1025
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1026
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
  1027
                SDL_SetError("Audio device already open");
icculus@2049
  1028
                return 0;
icculus@2049
  1029
            }
icculus@2049
  1030
        }
icculus@9394
  1031
    } else if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
  1032
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
  1033
            SDL_SetError("No such device");
icculus@2049
  1034
            return 0;
icculus@2049
  1035
        }
icculus@2049
  1036
        devname = NULL;
icculus@2049
  1037
icculus@2049
  1038
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1039
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
  1040
                SDL_SetError("Audio device already open");
icculus@2049
  1041
                return 0;
icculus@2049
  1042
            }
icculus@2049
  1043
        }
icculus@9394
  1044
    } else if (devname != NULL) {
icculus@9394
  1045
        /* if the app specifies an exact string, we can pass the backend
icculus@9394
  1046
           an actual device handle thingey, which saves them the effort of
icculus@9394
  1047
           figuring out what device this was (such as, reenumerating
icculus@9394
  1048
           everything again to find the matching human-readable name).
icculus@9394
  1049
           It might still need to open a device based on the string for,
icculus@9394
  1050
           say, a network audio server, but this optimizes some cases. */
icculus@9394
  1051
        SDL_AudioDeviceItem *item;
icculus@9394
  1052
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
  1053
        for (item = iscapture ? current_audio.inputDevices : current_audio.outputDevices; item; item = item->next) {
icculus@9394
  1054
            if ((item->handle != NULL) && (SDL_strcmp(item->name, devname) == 0)) {
icculus@9394
  1055
                handle = item->handle;
icculus@9394
  1056
                break;
icculus@9394
  1057
            }
icculus@9394
  1058
        }
icculus@9394
  1059
        SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
  1060
    }
icculus@9394
  1061
icculus@9394
  1062
    if (!current_audio.impl.AllowsArbitraryDeviceNames) {
icculus@9394
  1063
        /* has to be in our device list, or the default device. */
icculus@9394
  1064
        if ((handle == NULL) && (devname != NULL)) {
icculus@9394
  1065
            SDL_SetError("No such device.");
icculus@9394
  1066
            return 0;
icculus@9394
  1067
        }
icculus@2049
  1068
    }
icculus@2049
  1069
slouken@2060
  1070
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
  1071
    if (device == NULL) {
icculus@2049
  1072
        SDL_OutOfMemory();
icculus@2049
  1073
        return 0;
icculus@2049
  1074
    }
icculus@9012
  1075
    SDL_zerop(device);
icculus@9393
  1076
    device->id = id + 1;
slouken@2866
  1077
    device->spec = *obtained;
icculus@2049
  1078
    device->enabled = 1;
icculus@2049
  1079
    device->paused = 1;
icculus@2049
  1080
    device->iscapture = iscapture;
icculus@2049
  1081
icculus@9391
  1082
    /* Create a mutex for locking the sound buffers */
icculus@2049
  1083
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
  1084
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
  1085
        if (device->mixer_lock == NULL) {
icculus@2049
  1086
            close_audio_device(device);
icculus@2049
  1087
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
  1088
            return 0;
icculus@2049
  1089
        }
icculus@2049
  1090
    }
icculus@2049
  1091
icculus@9394
  1092
    if (current_audio.impl.OpenDevice(device, handle, devname, iscapture) < 0) {
icculus@2049
  1093
        close_audio_device(device);
icculus@2049
  1094
        return 0;
icculus@2049
  1095
    }
icculus@2049
  1096
    device->opened = 1;
slouken@0
  1097
slouken@1895
  1098
    /* See if we need to do any conversion */
slouken@2866
  1099
    build_cvt = SDL_FALSE;
slouken@2866
  1100
    if (obtained->freq != device->spec.freq) {
slouken@2866
  1101
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
  1102
            obtained->freq = device->spec.freq;
slouken@2866
  1103
        } else {
slouken@2866
  1104
            build_cvt = SDL_TRUE;
slouken@2866
  1105
        }
slouken@2866
  1106
    }
slouken@2866
  1107
    if (obtained->format != device->spec.format) {
slouken@2866
  1108
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
  1109
            obtained->format = device->spec.format;
slouken@2866
  1110
        } else {
slouken@2866
  1111
            build_cvt = SDL_TRUE;
slouken@2866
  1112
        }
slouken@2866
  1113
    }
slouken@2866
  1114
    if (obtained->channels != device->spec.channels) {
slouken@2866
  1115
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
  1116
            obtained->channels = device->spec.channels;
slouken@2866
  1117
        } else {
slouken@2866
  1118
            build_cvt = SDL_TRUE;
slouken@2866
  1119
        }
slouken@2866
  1120
    }
slouken@7518
  1121
slouken@7518
  1122
    /* If the audio driver changes the buffer size, accept it.
slouken@7518
  1123
       This needs to be done after the format is modified above,
slouken@7518
  1124
       otherwise it might not have the correct buffer size.
slouken@7518
  1125
     */
slouken@7518
  1126
    if (device->spec.samples != obtained->samples) {
slouken@7518
  1127
        obtained->samples = device->spec.samples;
slouken@7518
  1128
        SDL_CalculateAudioSpec(obtained);
slouken@7518
  1129
    }
slouken@7518
  1130
slouken@2866
  1131
    if (build_cvt) {
slouken@1895
  1132
        /* Build an audio conversion block */
icculus@2049
  1133
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
  1134
                              obtained->format, obtained->channels,
slouken@2866
  1135
                              obtained->freq,
icculus@2049
  1136
                              device->spec.format, device->spec.channels,
icculus@2049
  1137
                              device->spec.freq) < 0) {
icculus@2049
  1138
            close_audio_device(device);
icculus@2049
  1139
            return 0;
slouken@1895
  1140
        }
icculus@2049
  1141
        if (device->convert.needed) {
slouken@7518
  1142
            device->convert.len = (int) (((double) device->spec.size) /
slouken@2060
  1143
                                         device->convert.len_ratio);
icculus@2053
  1144
icculus@2049
  1145
            device->convert.buf =
icculus@2049
  1146
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1147
                                            device->convert.len_mult);
icculus@2049
  1148
            if (device->convert.buf == NULL) {
icculus@2049
  1149
                close_audio_device(device);
slouken@1895
  1150
                SDL_OutOfMemory();
icculus@2049
  1151
                return 0;
slouken@1895
  1152
            }
slouken@1895
  1153
        }
slouken@1895
  1154
    }
icculus@2049
  1155
icculus@9397
  1156
    /* Allocate a fake audio memory buffer */
icculus@9397
  1157
    stream_len = (device->convert.needed) ? device->convert.len_cvt : 0;
icculus@9397
  1158
    if (device->spec.size > stream_len) {
icculus@9397
  1159
        stream_len = device->spec.size;
icculus@9397
  1160
    }
icculus@9405
  1161
    SDL_assert(stream_len > 0);
icculus@9397
  1162
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(stream_len);
icculus@9397
  1163
    if (device->fake_stream == NULL) {
icculus@9397
  1164
        close_audio_device(device);
icculus@9397
  1165
        SDL_OutOfMemory();
icculus@9397
  1166
        return 0;
icculus@9397
  1167
    }
icculus@9397
  1168
icculus@9012
  1169
    if (device->spec.callback == NULL) {  /* use buffer queueing? */
icculus@9012
  1170
        /* pool a few packets to start. Enough for two callbacks. */
icculus@9012
  1171
        const int packetlen = SDL_AUDIOBUFFERQUEUE_PACKETLEN;
icculus@9012
  1172
        const int wantbytes = ((device->convert.needed) ? device->convert.len : device->spec.size) * 2;
icculus@9012
  1173
        const int wantpackets = (wantbytes / packetlen) + ((wantbytes % packetlen) ? packetlen : 0);
icculus@9012
  1174
        for (i = 0; i < wantpackets; i++) {
icculus@9012
  1175
            SDL_AudioBufferQueue *packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
  1176
            if (packet) { /* don't care if this fails, we'll deal later. */
icculus@9012
  1177
                packet->datalen = 0;
icculus@9012
  1178
                packet->startpos = 0;
icculus@9012
  1179
                packet->next = device->buffer_queue_pool;
icculus@9012
  1180
                device->buffer_queue_pool = packet;
icculus@9012
  1181
            }
icculus@9012
  1182
        }
icculus@9012
  1183
icculus@9012
  1184
        device->spec.callback = SDL_BufferQueueDrainCallback;
icculus@9012
  1185
        device->spec.userdata = device;
icculus@9012
  1186
    }
icculus@9012
  1187
icculus@9393
  1188
    /* add it to our list of open devices. */
icculus@9393
  1189
    open_devices[id] = device;
icculus@2049
  1190
slouken@1895
  1191
    /* Start the audio thread if necessary */
icculus@2049
  1192
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1193
        /* Start the audio thread */
icculus@5969
  1194
        char name[64];
icculus@9393
  1195
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) device->id);
icculus@2049
  1196
/* !!! FIXME: this is nasty. */
icculus@6430
  1197
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1198
#undef SDL_CreateThread
icculus@8094
  1199
#if SDL_DYNAMIC_API
icculus@8094
  1200
        device->thread = SDL_CreateThread_REAL(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1201
#else
icculus@5969
  1202
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1203
#endif
slouken@1330
  1204
#else
icculus@5969
  1205
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1206
#endif
icculus@2049
  1207
        if (device->thread == NULL) {
icculus@9393
  1208
            SDL_CloseAudioDevice(device->id);
slouken@1895
  1209
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1210
            return 0;
icculus@2049
  1211
        }
icculus@2049
  1212
    }
icculus@2049
  1213
icculus@9393
  1214
    return device->id;
icculus@2049
  1215
}
icculus@2049
  1216
icculus@2049
  1217
icculus@2049
  1218
int
slouken@2866
  1219
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1220
{
icculus@2049
  1221
    SDL_AudioDeviceID id = 0;
icculus@2049
  1222
icculus@2049
  1223
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1224
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1225
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
icculus@9382
  1226
            return -1;
slouken@1895
  1227
        }
icculus@2049
  1228
    }
slouken@0
  1229
icculus@2049
  1230
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1231
    if (open_devices[0] != NULL) {
icculus@2049
  1232
        SDL_SetError("Audio device is already opened");
icculus@9382
  1233
        return -1;
slouken@1895
  1234
    }
slouken@21
  1235
slouken@2866
  1236
    if (obtained) {
slouken@2866
  1237
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1238
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1239
    } else {
slouken@8919
  1240
        id = open_audio_device(NULL, 0, desired, NULL, 0, 1);
slouken@2866
  1241
    }
slouken@21
  1242
icculus@5964
  1243
    SDL_assert((id == 0) || (id == 1));
icculus@9382
  1244
    return (id == 0) ? -1 : 0;
icculus@2049
  1245
}
icculus@2049
  1246
icculus@2049
  1247
SDL_AudioDeviceID
icculus@2049
  1248
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1249
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1250
                    int allowed_changes)
icculus@2049
  1251
{
slouken@2866
  1252
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1253
                             allowed_changes, 2);
slouken@0
  1254
}
slouken@0
  1255
slouken@3537
  1256
SDL_AudioStatus
icculus@2049
  1257
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@0
  1258
{
icculus@2049
  1259
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1260
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1261
    if (device && device->enabled) {
icculus@2049
  1262
        if (device->paused) {
slouken@1895
  1263
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1264
        } else {
slouken@1895
  1265
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1266
        }
slouken@1895
  1267
    }
icculus@9382
  1268
    return status;
slouken@0
  1269
}
slouken@0
  1270
icculus@2049
  1271
slouken@3537
  1272
SDL_AudioStatus
icculus@2049
  1273
SDL_GetAudioStatus(void)
icculus@2049
  1274
{
icculus@2049
  1275
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1276
}
icculus@2049
  1277
icculus@2049
  1278
void
icculus@2049
  1279
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1280
{
icculus@2049
  1281
    SDL_AudioDevice *device = get_audio_device(devid);
gabomdq@9148
  1282
    if (device) {
gabomdq@9148
  1283
        current_audio.impl.LockDevice(device);
icculus@2049
  1284
        device->paused = pause_on;
gabomdq@9148
  1285
        current_audio.impl.UnlockDevice(device);
icculus@2049
  1286
    }
icculus@2049
  1287
}
icculus@2049
  1288
slouken@1895
  1289
void
slouken@1895
  1290
SDL_PauseAudio(int pause_on)
slouken@0
  1291
{
gabomdq@9148
  1292
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1293
}
slouken@0
  1294
icculus@2049
  1295
icculus@2049
  1296
void
icculus@2049
  1297
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1298
{
icculus@2049
  1299
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1300
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1301
    if (device) {
icculus@2049
  1302
        current_audio.impl.LockDevice(device);
slouken@1895
  1303
    }
slouken@0
  1304
}
slouken@0
  1305
slouken@1895
  1306
void
slouken@1895
  1307
SDL_LockAudio(void)
slouken@0
  1308
{
icculus@2049
  1309
    SDL_LockAudioDevice(1);
icculus@2049
  1310
}
slouken@0
  1311
icculus@2049
  1312
void
icculus@2049
  1313
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1314
{
slouken@1895
  1315
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1316
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1317
    if (device) {
icculus@2049
  1318
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1319
    }
slouken@0
  1320
}
slouken@0
  1321
slouken@1895
  1322
void
slouken@1895
  1323
SDL_UnlockAudio(void)
slouken@0
  1324
{
icculus@2049
  1325
    SDL_UnlockAudioDevice(1);
icculus@2049
  1326
}
slouken@0
  1327
icculus@2049
  1328
void
icculus@2049
  1329
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1330
{
icculus@2049
  1331
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1332
    if (device) {
icculus@2049
  1333
        close_audio_device(device);
slouken@2060
  1334
        open_devices[devid - 1] = NULL;
slouken@1895
  1335
    }
slouken@0
  1336
}
slouken@0
  1337
slouken@1895
  1338
void
slouken@1895
  1339
SDL_CloseAudio(void)
slouken@0
  1340
{
icculus@2049
  1341
    SDL_CloseAudioDevice(1);
slouken@0
  1342
}
slouken@0
  1343
slouken@1895
  1344
void
slouken@1895
  1345
SDL_AudioQuit(void)
slouken@0
  1346
{
icculus@7348
  1347
    SDL_AudioDeviceID i;
icculus@7348
  1348
icculus@7345
  1349
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1350
        return;
icculus@7345
  1351
    }
icculus@7345
  1352
icculus@2049
  1353
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1354
        if (open_devices[i] != NULL) {
icculus@7446
  1355
            SDL_CloseAudioDevice(i+1);
icculus@7342
  1356
        }
icculus@2049
  1357
    }
slouken@0
  1358
icculus@9394
  1359
    free_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount);
icculus@9394
  1360
    free_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount);
icculus@9394
  1361
icculus@2049
  1362
    /* Free the driver data */
icculus@2049
  1363
    current_audio.impl.Deinitialize();
icculus@9393
  1364
icculus@9394
  1365
    SDL_DestroyMutex(current_audio.detectionLock);
icculus@9393
  1366
icculus@9393
  1367
    SDL_zero(current_audio);
icculus@9393
  1368
    SDL_zero(open_devices);
slouken@0
  1369
}
slouken@0
  1370
icculus@1982
  1371
#define NUM_FORMATS 10
slouken@0
  1372
static int format_idx;
slouken@0
  1373
static int format_idx_sub;
icculus@1982
  1374
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1375
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1376
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1377
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1378
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1379
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1380
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1381
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1382
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1383
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1384
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1385
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1386
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1387
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1388
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1389
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1390
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1391
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1392
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1393
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1394
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1395
};
slouken@0
  1396
icculus@1982
  1397
SDL_AudioFormat
icculus@1982
  1398
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1399
{
slouken@1895
  1400
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1401
        if (format_list[format_idx][0] == format) {
slouken@1895
  1402
            break;
slouken@1895
  1403
        }
slouken@1895
  1404
    }
slouken@1895
  1405
    format_idx_sub = 0;
icculus@9382
  1406
    return SDL_NextAudioFormat();
slouken@0
  1407
}
slouken@0
  1408
icculus@1982
  1409
SDL_AudioFormat
slouken@1895
  1410
SDL_NextAudioFormat(void)
slouken@0
  1411
{
slouken@1895
  1412
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
icculus@9382
  1413
        return 0;
slouken@1895
  1414
    }
icculus@9382
  1415
    return format_list[format_idx][format_idx_sub++];
slouken@0
  1416
}
slouken@0
  1417
slouken@1895
  1418
void
slouken@1895
  1419
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1420
{
slouken@1895
  1421
    switch (spec->format) {
slouken@1895
  1422
    case AUDIO_U8:
slouken@1895
  1423
        spec->silence = 0x80;
slouken@1895
  1424
        break;
slouken@1895
  1425
    default:
slouken@1895
  1426
        spec->silence = 0x00;
slouken@1895
  1427
        break;
slouken@1895
  1428
    }
icculus@2049
  1429
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1430
    spec->size *= spec->channels;
slouken@1895
  1431
    spec->size *= spec->samples;
slouken@0
  1432
}
slouken@1895
  1433
icculus@2049
  1434
icculus@2049
  1435
/*
icculus@2049
  1436
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1437
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1438
 */
icculus@2049
  1439
void
icculus@2049
  1440
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1441
{
icculus@2049
  1442
    /* Mix the user-level audio format */
icculus@2049
  1443
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1444
    if (device != NULL) {
icculus@2049
  1445
        SDL_AudioFormat format;
icculus@2049
  1446
        if (device->convert.needed) {
icculus@2049
  1447
            format = device->convert.src_format;
icculus@2049
  1448
        } else {
icculus@2049
  1449
            format = device->spec.format;
icculus@2049
  1450
        }
icculus@2049
  1451
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1452
    }
icculus@2049
  1453
}
icculus@2049
  1454
slouken@1895
  1455
/* vi: set ts=4 sw=4 expandtab: */