src/audio/SDL_audio.c
author Ryan C. Gordon
Thu, 19 Mar 2015 13:34:17 -0400
changeset 9398 c41dd34e4996
parent 9397 d72d2aa46341
child 9399 a684dbd185c7
permissions -rw-r--r--
Removed the broken audio streaming code, other small cleanups.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* 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);
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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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            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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        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;
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        SDL_PushEvent(&event);
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    }
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}
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static void
icculus@9394
   388
mark_device_removed(void *handle, SDL_AudioDeviceItem *devices, SDL_bool *removedFlag)
icculus@9394
   389
{
icculus@9394
   390
    SDL_AudioDeviceItem *item;
icculus@9394
   391
    SDL_assert(handle != NULL);
icculus@9394
   392
    for (item = devices; item != NULL; item = item->next) {
icculus@9394
   393
        if (item->handle == handle) {
icculus@9394
   394
            item->handle = NULL;
icculus@9394
   395
            *removedFlag = SDL_TRUE;
icculus@9394
   396
            return;
icculus@9393
   397
        }
icculus@9393
   398
    }
icculus@9394
   399
}
icculus@9393
   400
icculus@9394
   401
/* The audio backends call this when a device is removed from the system. */
icculus@9394
   402
void
icculus@9394
   403
SDL_RemoveAudioDevice(void *handle)
icculus@9394
   404
{
icculus@9394
   405
    SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   406
    mark_device_removed(handle, current_audio.inputDevices, &current_audio.captureDevicesRemoved);
icculus@9394
   407
    mark_device_removed(handle, current_audio.outputDevices, &current_audio.outputDevicesRemoved);
icculus@9394
   408
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
   409
    current_audio.impl.FreeDeviceHandle(handle);
icculus@9393
   410
}
icculus@9393
   411
icculus@9393
   412
icculus@9012
   413
icculus@9012
   414
/* buffer queueing support... */
icculus@9012
   415
icculus@9012
   416
/* this expects that you managed thread safety elsewhere. */
icculus@9012
   417
static void
icculus@9012
   418
free_audio_queue(SDL_AudioBufferQueue *buffer)
icculus@9012
   419
{
icculus@9012
   420
    while (buffer) {
icculus@9012
   421
        SDL_AudioBufferQueue *next = buffer->next;
icculus@9012
   422
        SDL_free(buffer);
icculus@9012
   423
        buffer = next;
icculus@9012
   424
    }
icculus@9012
   425
}
icculus@9012
   426
icculus@9012
   427
static void SDLCALL
icculus@9012
   428
SDL_BufferQueueDrainCallback(void *userdata, Uint8 *stream, int _len)
icculus@9012
   429
{
icculus@9012
   430
    /* this function always holds the mixer lock before being called. */
icculus@9012
   431
    Uint32 len = (Uint32) _len;
icculus@9012
   432
    SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
icculus@9012
   433
    SDL_AudioBufferQueue *buffer;
icculus@9012
   434
icculus@9012
   435
    SDL_assert(device != NULL);  /* this shouldn't ever happen, right?! */
icculus@9012
   436
    SDL_assert(_len >= 0);  /* this shouldn't ever happen, right?! */
icculus@9012
   437
icculus@9012
   438
    while ((len > 0) && ((buffer = device->buffer_queue_head) != NULL)) {
icculus@9012
   439
        const Uint32 avail = buffer->datalen - buffer->startpos;
icculus@9012
   440
        const Uint32 cpy = SDL_min(len, avail);
icculus@9012
   441
        SDL_assert(device->queued_bytes >= avail);
icculus@9012
   442
icculus@9012
   443
        SDL_memcpy(stream, buffer->data + buffer->startpos, cpy);
icculus@9012
   444
        buffer->startpos += cpy;
icculus@9012
   445
        stream += cpy;
icculus@9012
   446
        device->queued_bytes -= cpy;
icculus@9012
   447
        len -= cpy;
icculus@9012
   448
icculus@9012
   449
        if (buffer->startpos == buffer->datalen) {  /* packet is done, put it in the pool. */
icculus@9012
   450
            device->buffer_queue_head = buffer->next;
icculus@9012
   451
            SDL_assert((buffer->next != NULL) || (buffer == device->buffer_queue_tail));
icculus@9012
   452
            buffer->next = device->buffer_queue_pool;
icculus@9012
   453
            device->buffer_queue_pool = buffer;
icculus@9012
   454
        }
icculus@9012
   455
    }
icculus@9012
   456
icculus@9012
   457
    SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   458
icculus@9012
   459
    if (len > 0) {  /* fill any remaining space in the stream with silence. */
icculus@9012
   460
        SDL_assert(device->buffer_queue_head == NULL);
icculus@9012
   461
        SDL_memset(stream, device->spec.silence, len);
icculus@9012
   462
    }
icculus@9012
   463
icculus@9012
   464
    if (device->buffer_queue_head == NULL) {
icculus@9012
   465
        device->buffer_queue_tail = NULL;  /* in case we drained the queue entirely. */
icculus@9012
   466
    }
icculus@9012
   467
}
icculus@9012
   468
icculus@9012
   469
int
icculus@9012
   470
SDL_QueueAudio(SDL_AudioDeviceID devid, const void *_data, Uint32 len)
icculus@9012
   471
{
icculus@9012
   472
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   473
    const Uint8 *data = (const Uint8 *) _data;
icculus@9012
   474
    SDL_AudioBufferQueue *orighead;
icculus@9012
   475
    SDL_AudioBufferQueue *origtail;
icculus@9012
   476
    Uint32 origlen;
icculus@9012
   477
    Uint32 datalen;
icculus@9012
   478
icculus@9012
   479
    if (!device) {
icculus@9012
   480
        return -1;  /* get_audio_device() will have set the error state */
icculus@9012
   481
    }
icculus@9012
   482
icculus@9012
   483
    if (device->spec.callback != SDL_BufferQueueDrainCallback) {
icculus@9012
   484
        return SDL_SetError("Audio device has a callback, queueing not allowed");
icculus@9012
   485
    }
icculus@9012
   486
icculus@9012
   487
    current_audio.impl.LockDevice(device);
icculus@9012
   488
icculus@9012
   489
    orighead = device->buffer_queue_head;
icculus@9012
   490
    origtail = device->buffer_queue_tail;
icculus@9012
   491
    origlen = origtail ? origtail->datalen : 0;
icculus@9012
   492
icculus@9012
   493
    while (len > 0) {
icculus@9012
   494
        SDL_AudioBufferQueue *packet = device->buffer_queue_tail;
icculus@9012
   495
        SDL_assert(!packet || (packet->datalen <= SDL_AUDIOBUFFERQUEUE_PACKETLEN));
icculus@9012
   496
        if (!packet || (packet->datalen >= SDL_AUDIOBUFFERQUEUE_PACKETLEN)) {
icculus@9012
   497
            /* tail packet missing or completely full; we need a new packet. */
icculus@9012
   498
            packet = device->buffer_queue_pool;
icculus@9012
   499
            if (packet != NULL) {
icculus@9012
   500
                /* we have one available in the pool. */
icculus@9012
   501
                device->buffer_queue_pool = packet->next;
icculus@9012
   502
            } else {
icculus@9012
   503
                /* Have to allocate a new one! */
icculus@9012
   504
                packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
   505
                if (packet == NULL) {
icculus@9012
   506
                    /* uhoh, reset so we've queued nothing new, free what we can. */
icculus@9012
   507
                    if (!origtail) {
icculus@9012
   508
                        packet = device->buffer_queue_head;  /* whole queue. */
icculus@9012
   509
                    } else {
icculus@9012
   510
                        packet = origtail->next;  /* what we added to existing queue. */
icculus@9012
   511
                        origtail->next = NULL;
icculus@9012
   512
                        origtail->datalen = origlen;
icculus@9012
   513
                    }
icculus@9012
   514
                    device->buffer_queue_head = orighead;
icculus@9012
   515
                    device->buffer_queue_tail = origtail;
icculus@9012
   516
                    device->buffer_queue_pool = NULL;
icculus@9012
   517
icculus@9012
   518
                    current_audio.impl.UnlockDevice(device);
icculus@9012
   519
icculus@9012
   520
                    free_audio_queue(packet);  /* give back what we can. */
icculus@9012
   521
icculus@9012
   522
                    return SDL_OutOfMemory();
icculus@9012
   523
                }
icculus@9012
   524
            }
icculus@9012
   525
            packet->datalen = 0;
icculus@9012
   526
            packet->startpos = 0;
icculus@9012
   527
            packet->next = NULL;
icculus@9012
   528
icculus@9012
   529
            SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   530
            if (device->buffer_queue_tail == NULL) {
icculus@9012
   531
                device->buffer_queue_head = packet;
icculus@9012
   532
            } else {
icculus@9012
   533
                device->buffer_queue_tail->next = packet;
icculus@9012
   534
            }
icculus@9012
   535
            device->buffer_queue_tail = packet;
icculus@9012
   536
        }
icculus@9012
   537
icculus@9012
   538
        datalen = SDL_min(len, SDL_AUDIOBUFFERQUEUE_PACKETLEN - packet->datalen);
icculus@9012
   539
        SDL_memcpy(packet->data + packet->datalen, data, datalen);
icculus@9012
   540
        data += datalen;
icculus@9012
   541
        len -= datalen;
icculus@9012
   542
        packet->datalen += datalen;
icculus@9012
   543
        device->queued_bytes += datalen;
icculus@9012
   544
    }
icculus@9012
   545
icculus@9012
   546
    current_audio.impl.UnlockDevice(device);
icculus@9012
   547
icculus@9012
   548
    return 0;
icculus@9012
   549
}
icculus@9012
   550
icculus@9012
   551
Uint32
icculus@9012
   552
SDL_GetQueuedAudioSize(SDL_AudioDeviceID devid)
icculus@9012
   553
{
icculus@9012
   554
    Uint32 retval = 0;
icculus@9012
   555
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9032
   556
icculus@9032
   557
    /* Nothing to do unless we're set up for queueing. */
icculus@9032
   558
    if (device && (device->spec.callback == SDL_BufferQueueDrainCallback)) {
icculus@9012
   559
        current_audio.impl.LockDevice(device);
icculus@9031
   560
        retval = device->queued_bytes + current_audio.impl.GetPendingBytes(device);
icculus@9012
   561
        current_audio.impl.UnlockDevice(device);
icculus@9012
   562
    }
icculus@9012
   563
icculus@9012
   564
    return retval;
icculus@9012
   565
}
icculus@9012
   566
icculus@9012
   567
void
icculus@9012
   568
SDL_ClearQueuedAudio(SDL_AudioDeviceID devid)
icculus@9012
   569
{
icculus@9012
   570
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   571
    SDL_AudioBufferQueue *buffer = NULL;
icculus@9012
   572
    if (!device) {
icculus@9012
   573
        return;  /* nothing to do. */
icculus@9012
   574
    }
icculus@9012
   575
icculus@9012
   576
    /* Blank out the device and release the mutex. Free it afterwards. */
icculus@9012
   577
    current_audio.impl.LockDevice(device);
icculus@9012
   578
    buffer = device->buffer_queue_head;
icculus@9012
   579
    device->buffer_queue_tail = NULL;
icculus@9012
   580
    device->buffer_queue_head = NULL;
icculus@9012
   581
    device->queued_bytes = 0;
icculus@9012
   582
    current_audio.impl.UnlockDevice(device);
icculus@9012
   583
icculus@9012
   584
    free_audio_queue(buffer);
icculus@9012
   585
}
icculus@9012
   586
icculus@9012
   587
dimitris@8761
   588
#if defined(__ANDROID__)
paul@4722
   589
#include <android/log.h>
aschiffler@4865
   590
#endif
paul@4722
   591
slouken@0
   592
/* The general mixing thread function */
slouken@1895
   593
int SDLCALL
icculus@2049
   594
SDL_RunAudio(void *devicep)
slouken@0
   595
{
icculus@2049
   596
    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
icculus@9398
   597
    const int silence = (int) device->spec.silence;
icculus@9398
   598
    const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
icculus@9398
   599
    const int stream_len = (device->convert.needed) ? device->convert.len : device->spec.size;
slouken@1895
   600
    Uint8 *stream;
icculus@9398
   601
    void *udata = device->spec.userdata;
icculus@9398
   602
    void (SDLCALL *fill) (void *, Uint8 *, int) = device->spec.callback;
slouken@2716
   603
slouken@5509
   604
    /* The audio mixing is always a high priority thread */
slouken@5509
   605
    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
slouken@5509
   606
slouken@1895
   607
    /* Perform any thread setup */
icculus@2049
   608
    device->threadid = SDL_ThreadID();
icculus@2049
   609
    current_audio.impl.ThreadInit(device);
slouken@0
   610
icculus@9398
   611
    /* Loop, filling the audio buffers */
icculus@9398
   612
    while (!device->shutdown) {
icculus@9398
   613
        /* Fill the current buffer with sound */
icculus@9398
   614
        if (device->convert.needed) {
icculus@9398
   615
            stream = device->convert.buf;
icculus@9398
   616
        } else if (device->enabled) {
icculus@9398
   617
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9398
   618
        } else {
icculus@9398
   619
            /* if the device isn't enabled, we still write to the
icculus@9398
   620
               fake_stream, so the app's callback will fire with
icculus@9398
   621
               a regular frequency, in case they depend on that
icculus@9398
   622
               for timing or progress. They can use hotplug
icculus@9398
   623
               now to know if the device failed. */
icculus@9398
   624
            stream = NULL;
slouken@2716
   625
        }
slouken@3336
   626
icculus@9398
   627
        if (stream == NULL) {
icculus@9398
   628
            stream = device->fake_stream;
icculus@9398
   629
        }
slouken@2716
   630
icculus@9398
   631
        /* !!! FIXME: this should be LockDevice. */
icculus@9398
   632
        SDL_LockMutex(device->mixer_lock);
icculus@9398
   633
        if (device->paused) {
icculus@9398
   634
            SDL_memset(stream, silence, stream_len);
icculus@9398
   635
        } else {
icculus@9398
   636
            (*fill) (udata, stream, stream_len);
icculus@9398
   637
        }
icculus@9398
   638
        SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   639
icculus@9398
   640
        /* Convert the audio if necessary */
icculus@9398
   641
        if (device->enabled && device->convert.needed) {
icculus@9398
   642
            SDL_ConvertAudio(&device->convert);
icculus@9398
   643
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9397
   644
            if (stream == NULL) {
icculus@9397
   645
                stream = device->fake_stream;
icculus@9398
   646
            } else {
icculus@9398
   647
                SDL_memcpy(stream, device->convert.buf,
icculus@9398
   648
                           device->convert.len_cvt);
slouken@1895
   649
            }
icculus@9398
   650
        }
slouken@1562
   651
icculus@9398
   652
        /* Ready current buffer for play and change current buffer */
icculus@9398
   653
        if (stream == device->fake_stream) {
icculus@9398
   654
            SDL_Delay(delay);
icculus@9398
   655
        } else {
icculus@9398
   656
            current_audio.impl.PlayDevice(device);
icculus@9398
   657
            current_audio.impl.WaitDevice(device);
slouken@1895
   658
        }
slouken@1895
   659
    }
slouken@1562
   660
icculus@9398
   661
    /* Wait for the audio to drain. */
icculus@2049
   662
    current_audio.impl.WaitDone(device);
slouken@21
   663
icculus@9382
   664
    return 0;
slouken@0
   665
}
slouken@0
   666
slouken@322
   667
icculus@1982
   668
static SDL_AudioFormat
slouken@1895
   669
SDL_ParseAudioFormat(const char *string)
slouken@1794
   670
{
icculus@2076
   671
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   672
    CHECK_FMT_STRING(U8);
icculus@2049
   673
    CHECK_FMT_STRING(S8);
icculus@2049
   674
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   675
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   676
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   677
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   678
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   679
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   680
    CHECK_FMT_STRING(U16);
icculus@2049
   681
    CHECK_FMT_STRING(S16);
icculus@2049
   682
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   683
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   684
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   685
    CHECK_FMT_STRING(S32);
icculus@2049
   686
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   687
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   688
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   689
    CHECK_FMT_STRING(F32);
slouken@2060
   690
#undef CHECK_FMT_STRING
icculus@2049
   691
    return 0;
slouken@1895
   692
}
slouken@1895
   693
slouken@1895
   694
int
slouken@1895
   695
SDL_GetNumAudioDrivers(void)
slouken@1895
   696
{
icculus@9382
   697
    return SDL_arraysize(bootstrap) - 1;
slouken@1895
   698
}
slouken@1895
   699
slouken@1895
   700
const char *
slouken@1895
   701
SDL_GetAudioDriver(int index)
slouken@1895
   702
{
slouken@1895
   703
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
icculus@9382
   704
        return bootstrap[index]->name;
slouken@1895
   705
    }
icculus@9382
   706
    return NULL;
slouken@1794
   707
}
slouken@1794
   708
slouken@1895
   709
int
slouken@1895
   710
SDL_AudioInit(const char *driver_name)
slouken@0
   711
{
icculus@2049
   712
    int i = 0;
icculus@2049
   713
    int initialized = 0;
icculus@2049
   714
    int tried_to_init = 0;
slouken@0
   715
icculus@2049
   716
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   717
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   718
    }
slouken@0
   719
icculus@9392
   720
    SDL_zero(current_audio);
icculus@9392
   721
    SDL_zero(open_devices);
icculus@2049
   722
slouken@1895
   723
    /* Select the proper audio driver */
slouken@1909
   724
    if (driver_name == NULL) {
slouken@1909
   725
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   726
    }
icculus@2049
   727
icculus@2049
   728
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   729
        /* make sure we should even try this driver before doing so... */
icculus@2049
   730
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   731
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   732
            (!driver_name && backend->demand_only)) {
icculus@2049
   733
            continue;
icculus@2049
   734
        }
slouken@0
   735
icculus@2049
   736
        tried_to_init = 1;
icculus@9392
   737
        SDL_zero(current_audio);
icculus@2049
   738
        current_audio.name = backend->name;
icculus@2049
   739
        current_audio.desc = backend->desc;
icculus@3699
   740
        initialized = backend->init(&current_audio.impl);
slouken@1895
   741
    }
icculus@2049
   742
icculus@2049
   743
    if (!initialized) {
icculus@2049
   744
        /* specific drivers will set the error message if they fail... */
icculus@2049
   745
        if (!tried_to_init) {
slouken@1895
   746
            if (driver_name) {
icculus@3699
   747
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   748
            } else {
slouken@1895
   749
                SDL_SetError("No available audio device");
slouken@1895
   750
            }
slouken@1895
   751
        }
icculus@2049
   752
icculus@9392
   753
        SDL_zero(current_audio);
icculus@9382
   754
        return -1;            /* No driver was available, so fail. */
slouken@1895
   755
    }
icculus@2049
   756
icculus@9394
   757
    current_audio.detectionLock = SDL_CreateMutex();
icculus@9393
   758
icculus@2049
   759
    finalize_audio_entry_points();
icculus@2049
   760
icculus@9393
   761
    /* Make sure we have a list of devices available at startup. */
icculus@9394
   762
    current_audio.impl.DetectDevices();
icculus@9393
   763
icculus@9382
   764
    return 0;
slouken@0
   765
}
slouken@0
   766
slouken@1895
   767
/*
slouken@1895
   768
 * Get the current audio driver name
slouken@1895
   769
 */
slouken@1895
   770
const char *
slouken@1895
   771
SDL_GetCurrentAudioDriver()
slouken@0
   772
{
icculus@2049
   773
    return current_audio.name;
slouken@0
   774
}
slouken@0
   775
icculus@9394
   776
/* Clean out devices that we've removed but had to keep around for stability. */
icculus@9394
   777
static void
icculus@9394
   778
clean_out_device_list(SDL_AudioDeviceItem **devices, int *devCount, SDL_bool *removedFlag)
icculus@9394
   779
{
icculus@9394
   780
    SDL_AudioDeviceItem *item = *devices;
icculus@9394
   781
    SDL_AudioDeviceItem *prev = NULL;
icculus@9394
   782
    int total = 0;
icculus@9394
   783
icculus@9394
   784
    while (item) {
icculus@9394
   785
        SDL_AudioDeviceItem *next = item->next;
icculus@9394
   786
        if (item->handle != NULL) {
icculus@9394
   787
            total++;
icculus@9394
   788
            prev = item;
icculus@9394
   789
        } else {
icculus@9394
   790
            if (prev) {
icculus@9394
   791
                prev->next = next;
icculus@9394
   792
            } else {
icculus@9394
   793
                *devices = next;
icculus@9394
   794
            }
icculus@9394
   795
            SDL_free(item);
icculus@9394
   796
        }
icculus@9394
   797
        item = next;
icculus@9394
   798
    }
icculus@9394
   799
icculus@9394
   800
    *devCount = total;
icculus@9394
   801
    *removedFlag = SDL_FALSE;
icculus@9394
   802
}
icculus@9394
   803
icculus@9394
   804
slouken@1895
   805
int
icculus@2049
   806
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   807
{
icculus@5593
   808
    int retval = 0;
icculus@5593
   809
icculus@2049
   810
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   811
        return -1;
icculus@2049
   812
    }
icculus@5593
   813
icculus@9394
   814
    SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   815
    if (iscapture && current_audio.captureDevicesRemoved) {
icculus@9394
   816
        clean_out_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount, &current_audio.captureDevicesRemoved);
icculus@2049
   817
    }
icculus@2049
   818
icculus@9394
   819
    if (!iscapture && current_audio.outputDevicesRemoved) {
icculus@9394
   820
        clean_out_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount, &current_audio.outputDevicesRemoved);
icculus@9394
   821
        current_audio.outputDevicesRemoved = SDL_FALSE;
icculus@5593
   822
    }
icculus@5593
   823
icculus@9393
   824
    retval = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
   825
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9393
   826
icculus@5593
   827
    return retval;
icculus@2049
   828
}
icculus@2049
   829
slouken@0
   830
icculus@2049
   831
const char *
icculus@2049
   832
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   833
{
icculus@9393
   834
    const char *retval = NULL;
icculus@9393
   835
icculus@2049
   836
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   837
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   838
        return NULL;
icculus@2049
   839
    }
icculus@2049
   840
icculus@2049
   841
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   842
        SDL_SetError("No capture support");
icculus@2049
   843
        return NULL;
slouken@1895
   844
    }
icculus@2049
   845
icculus@9394
   846
    if (index >= 0) {
icculus@9394
   847
        SDL_AudioDeviceItem *item;
icculus@9394
   848
        int i;
slouken@0
   849
icculus@9394
   850
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   851
        item = iscapture ? current_audio.inputDevices : current_audio.outputDevices;
icculus@9394
   852
        i = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
   853
        if (index < i) {
icculus@9394
   854
            for (i--; i > index; i--, item = item->next) {
icculus@9394
   855
                SDL_assert(item != NULL);
icculus@9394
   856
            }
icculus@9394
   857
            SDL_assert(item != NULL);
icculus@9394
   858
            retval = item->name;
slouken@7904
   859
        }
icculus@9394
   860
        SDL_UnlockMutex(current_audio.detectionLock);
slouken@1895
   861
    }
slouken@262
   862
icculus@9394
   863
    if (retval == NULL) {
icculus@9394
   864
        SDL_SetError("No such device");
icculus@5593
   865
    }
icculus@5593
   866
icculus@9394
   867
    return retval;
icculus@2049
   868
}
icculus@2049
   869
icculus@2049
   870
icculus@2049
   871
static void
slouken@2060
   872
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   873
{
icculus@2049
   874
    device->enabled = 0;
icculus@9397
   875
    device->shutdown = 1;
icculus@2049
   876
    if (device->thread != NULL) {
icculus@2049
   877
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   878
    }
icculus@2049
   879
    if (device->mixer_lock != NULL) {
icculus@2049
   880
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   881
    }
slouken@7719
   882
    SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   883
    if (device->convert.needed) {
icculus@2049
   884
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   885
    }
icculus@2049
   886
    if (device->opened) {
icculus@2049
   887
        current_audio.impl.CloseDevice(device);
icculus@2049
   888
        device->opened = 0;
icculus@2049
   889
    }
icculus@9012
   890
icculus@9012
   891
    free_audio_queue(device->buffer_queue_head);
icculus@9012
   892
    free_audio_queue(device->buffer_queue_pool);
icculus@9012
   893
icculus@2049
   894
    SDL_FreeAudioMem(device);
icculus@2049
   895
}
icculus@2049
   896
icculus@2049
   897
icculus@2049
   898
/*
icculus@2049
   899
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   900
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   901
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   902
 */
icculus@2049
   903
static int
slouken@2060
   904
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   905
{
slouken@2060
   906
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   907
icculus@2049
   908
    if (orig->freq == 0) {
icculus@2049
   909
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   910
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   911
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   912
        }
slouken@1895
   913
    }
icculus@2049
   914
icculus@2049
   915
    if (orig->format == 0) {
icculus@2049
   916
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   917
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   918
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
   919
        }
slouken@1895
   920
    }
icculus@2049
   921
icculus@2049
   922
    switch (orig->channels) {
slouken@2060
   923
    case 0:{
slouken@2060
   924
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   925
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   926
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   927
            }
slouken@2060
   928
            break;
icculus@2049
   929
        }
slouken@1895
   930
    case 1:                    /* Mono */
slouken@1895
   931
    case 2:                    /* Stereo */
slouken@1895
   932
    case 4:                    /* surround */
slouken@1895
   933
    case 6:                    /* surround with center and lfe */
slouken@1895
   934
        break;
slouken@1895
   935
    default:
icculus@2049
   936
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   937
        return 0;
slouken@1895
   938
    }
icculus@2049
   939
icculus@2049
   940
    if (orig->samples == 0) {
icculus@2049
   941
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   942
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   943
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   944
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   945
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   946
            int power2 = 1;
icculus@2049
   947
            while (power2 < samples) {
icculus@2049
   948
                power2 *= 2;
icculus@2049
   949
            }
icculus@2049
   950
            prepared->samples = power2;
slouken@1895
   951
        }
slouken@1895
   952
    }
slouken@0
   953
slouken@1895
   954
    /* Calculate the silence and size of the audio specification */
icculus@2049
   955
    SDL_CalculateAudioSpec(prepared);
slouken@21
   956
icculus@2049
   957
    return 1;
icculus@2049
   958
}
slouken@1408
   959
icculus@2049
   960
static SDL_AudioDeviceID
icculus@2049
   961
open_audio_device(const char *devname, int iscapture,
slouken@2866
   962
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   963
                  int allowed_changes, int min_id)
icculus@2049
   964
{
icculus@2049
   965
    SDL_AudioDeviceID id = 0;
slouken@2866
   966
    SDL_AudioSpec _obtained;
icculus@2049
   967
    SDL_AudioDevice *device;
slouken@2866
   968
    SDL_bool build_cvt;
icculus@9394
   969
    void *handle = NULL;
icculus@9397
   970
    int stream_len;
icculus@2049
   971
    int i = 0;
slouken@21
   972
icculus@2049
   973
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   974
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   975
        return 0;
icculus@2049
   976
    }
icculus@2049
   977
icculus@2049
   978
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   979
        SDL_SetError("No capture support");
icculus@2049
   980
        return 0;
icculus@2049
   981
    }
icculus@2049
   982
icculus@9393
   983
    /* Find an available device ID... */
icculus@9393
   984
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@9393
   985
        if (open_devices[id] == NULL) {
icculus@9393
   986
            break;
icculus@9393
   987
        }
icculus@9393
   988
    }
icculus@9393
   989
icculus@9393
   990
    if (id == SDL_arraysize(open_devices)) {
icculus@9393
   991
        SDL_SetError("Too many open audio devices");
icculus@9393
   992
        return 0;
icculus@9393
   993
    }
icculus@9393
   994
slouken@2866
   995
    if (!obtained) {
slouken@2866
   996
        obtained = &_obtained;
slouken@2866
   997
    }
slouken@2866
   998
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   999
        return 0;
icculus@2049
  1000
    }
icculus@2049
  1001
icculus@2049
  1002
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
  1003
    if (devname == NULL) {
icculus@2049
  1004
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
  1005
    }
slouken@21
  1006
icculus@2049
  1007
    /*
icculus@2049
  1008
     * Catch device names at the high level for the simple case...
icculus@2049
  1009
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
  1010
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
  1011
     *  always NULL when it hits the low level.
icculus@2049
  1012
     *
icculus@2049
  1013
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
  1014
     *  opens of the default system device.
icculus@2049
  1015
     */
icculus@2049
  1016
icculus@2049
  1017
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
  1018
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
  1019
            SDL_SetError("No such device");
icculus@2049
  1020
            return 0;
icculus@2049
  1021
        }
icculus@2049
  1022
        devname = NULL;
icculus@2049
  1023
icculus@2049
  1024
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1025
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
  1026
                SDL_SetError("Audio device already open");
icculus@2049
  1027
                return 0;
icculus@2049
  1028
            }
icculus@2049
  1029
        }
icculus@9394
  1030
    } else if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
  1031
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
  1032
            SDL_SetError("No such device");
icculus@2049
  1033
            return 0;
icculus@2049
  1034
        }
icculus@2049
  1035
        devname = NULL;
icculus@2049
  1036
icculus@2049
  1037
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1038
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
  1039
                SDL_SetError("Audio device already open");
icculus@2049
  1040
                return 0;
icculus@2049
  1041
            }
icculus@2049
  1042
        }
icculus@9394
  1043
    } else if (devname != NULL) {
icculus@9394
  1044
        /* if the app specifies an exact string, we can pass the backend
icculus@9394
  1045
           an actual device handle thingey, which saves them the effort of
icculus@9394
  1046
           figuring out what device this was (such as, reenumerating
icculus@9394
  1047
           everything again to find the matching human-readable name).
icculus@9394
  1048
           It might still need to open a device based on the string for,
icculus@9394
  1049
           say, a network audio server, but this optimizes some cases. */
icculus@9394
  1050
        SDL_AudioDeviceItem *item;
icculus@9394
  1051
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
  1052
        for (item = iscapture ? current_audio.inputDevices : current_audio.outputDevices; item; item = item->next) {
icculus@9394
  1053
            if ((item->handle != NULL) && (SDL_strcmp(item->name, devname) == 0)) {
icculus@9394
  1054
                handle = item->handle;
icculus@9394
  1055
                break;
icculus@9394
  1056
            }
icculus@9394
  1057
        }
icculus@9394
  1058
        SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
  1059
    }
icculus@9394
  1060
icculus@9394
  1061
    if (!current_audio.impl.AllowsArbitraryDeviceNames) {
icculus@9394
  1062
        /* has to be in our device list, or the default device. */
icculus@9394
  1063
        if ((handle == NULL) && (devname != NULL)) {
icculus@9394
  1064
            SDL_SetError("No such device.");
icculus@9394
  1065
            return 0;
icculus@9394
  1066
        }
icculus@2049
  1067
    }
icculus@2049
  1068
slouken@2060
  1069
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
  1070
    if (device == NULL) {
icculus@2049
  1071
        SDL_OutOfMemory();
icculus@2049
  1072
        return 0;
icculus@2049
  1073
    }
icculus@9012
  1074
    SDL_zerop(device);
icculus@9393
  1075
    device->id = id + 1;
slouken@2866
  1076
    device->spec = *obtained;
icculus@2049
  1077
    device->enabled = 1;
icculus@2049
  1078
    device->paused = 1;
icculus@2049
  1079
    device->iscapture = iscapture;
icculus@2049
  1080
icculus@9391
  1081
    /* Create a mutex for locking the sound buffers */
icculus@2049
  1082
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
  1083
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
  1084
        if (device->mixer_lock == NULL) {
icculus@2049
  1085
            close_audio_device(device);
icculus@2049
  1086
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
  1087
            return 0;
icculus@2049
  1088
        }
icculus@2049
  1089
    }
icculus@2049
  1090
icculus@9394
  1091
    if (current_audio.impl.OpenDevice(device, handle, devname, iscapture) < 0) {
icculus@2049
  1092
        close_audio_device(device);
icculus@2049
  1093
        return 0;
icculus@2049
  1094
    }
icculus@2049
  1095
    device->opened = 1;
slouken@0
  1096
slouken@1895
  1097
    /* See if we need to do any conversion */
slouken@2866
  1098
    build_cvt = SDL_FALSE;
slouken@2866
  1099
    if (obtained->freq != device->spec.freq) {
slouken@2866
  1100
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
  1101
            obtained->freq = device->spec.freq;
slouken@2866
  1102
        } else {
slouken@2866
  1103
            build_cvt = SDL_TRUE;
slouken@2866
  1104
        }
slouken@2866
  1105
    }
slouken@2866
  1106
    if (obtained->format != device->spec.format) {
slouken@2866
  1107
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
  1108
            obtained->format = device->spec.format;
slouken@2866
  1109
        } else {
slouken@2866
  1110
            build_cvt = SDL_TRUE;
slouken@2866
  1111
        }
slouken@2866
  1112
    }
slouken@2866
  1113
    if (obtained->channels != device->spec.channels) {
slouken@2866
  1114
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
  1115
            obtained->channels = device->spec.channels;
slouken@2866
  1116
        } else {
slouken@2866
  1117
            build_cvt = SDL_TRUE;
slouken@2866
  1118
        }
slouken@2866
  1119
    }
slouken@7518
  1120
slouken@7518
  1121
    /* If the audio driver changes the buffer size, accept it.
slouken@7518
  1122
       This needs to be done after the format is modified above,
slouken@7518
  1123
       otherwise it might not have the correct buffer size.
slouken@7518
  1124
     */
slouken@7518
  1125
    if (device->spec.samples != obtained->samples) {
slouken@7518
  1126
        obtained->samples = device->spec.samples;
slouken@7518
  1127
        SDL_CalculateAudioSpec(obtained);
slouken@7518
  1128
    }
slouken@7518
  1129
slouken@2866
  1130
    if (build_cvt) {
slouken@1895
  1131
        /* Build an audio conversion block */
icculus@2049
  1132
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
  1133
                              obtained->format, obtained->channels,
slouken@2866
  1134
                              obtained->freq,
icculus@2049
  1135
                              device->spec.format, device->spec.channels,
icculus@2049
  1136
                              device->spec.freq) < 0) {
icculus@2049
  1137
            close_audio_device(device);
icculus@2049
  1138
            return 0;
slouken@1895
  1139
        }
icculus@2049
  1140
        if (device->convert.needed) {
slouken@7518
  1141
            device->convert.len = (int) (((double) device->spec.size) /
slouken@2060
  1142
                                         device->convert.len_ratio);
icculus@2053
  1143
icculus@2049
  1144
            device->convert.buf =
icculus@2049
  1145
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1146
                                            device->convert.len_mult);
icculus@2049
  1147
            if (device->convert.buf == NULL) {
icculus@2049
  1148
                close_audio_device(device);
slouken@1895
  1149
                SDL_OutOfMemory();
icculus@2049
  1150
                return 0;
slouken@1895
  1151
            }
slouken@1895
  1152
        }
slouken@1895
  1153
    }
icculus@2049
  1154
icculus@9397
  1155
    /* Allocate a fake audio memory buffer */
icculus@9397
  1156
    stream_len = (device->convert.needed) ? device->convert.len_cvt : 0;
icculus@9397
  1157
    if (device->spec.size > stream_len) {
icculus@9397
  1158
        stream_len = device->spec.size;
icculus@9397
  1159
    }
icculus@9397
  1160
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(stream_len);
icculus@9397
  1161
    if (device->fake_stream == NULL) {
icculus@9397
  1162
        close_audio_device(device);
icculus@9397
  1163
        SDL_OutOfMemory();
icculus@9397
  1164
        return 0;
icculus@9397
  1165
    }
icculus@9397
  1166
icculus@9012
  1167
    if (device->spec.callback == NULL) {  /* use buffer queueing? */
icculus@9012
  1168
        /* pool a few packets to start. Enough for two callbacks. */
icculus@9012
  1169
        const int packetlen = SDL_AUDIOBUFFERQUEUE_PACKETLEN;
icculus@9012
  1170
        const int wantbytes = ((device->convert.needed) ? device->convert.len : device->spec.size) * 2;
icculus@9012
  1171
        const int wantpackets = (wantbytes / packetlen) + ((wantbytes % packetlen) ? packetlen : 0);
icculus@9012
  1172
        for (i = 0; i < wantpackets; i++) {
icculus@9012
  1173
            SDL_AudioBufferQueue *packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
  1174
            if (packet) { /* don't care if this fails, we'll deal later. */
icculus@9012
  1175
                packet->datalen = 0;
icculus@9012
  1176
                packet->startpos = 0;
icculus@9012
  1177
                packet->next = device->buffer_queue_pool;
icculus@9012
  1178
                device->buffer_queue_pool = packet;
icculus@9012
  1179
            }
icculus@9012
  1180
        }
icculus@9012
  1181
icculus@9012
  1182
        device->spec.callback = SDL_BufferQueueDrainCallback;
icculus@9012
  1183
        device->spec.userdata = device;
icculus@9012
  1184
    }
icculus@9012
  1185
icculus@9393
  1186
    /* add it to our list of open devices. */
icculus@9393
  1187
    open_devices[id] = device;
icculus@2049
  1188
slouken@1895
  1189
    /* Start the audio thread if necessary */
icculus@2049
  1190
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1191
        /* Start the audio thread */
icculus@5969
  1192
        char name[64];
icculus@9393
  1193
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) device->id);
icculus@2049
  1194
/* !!! FIXME: this is nasty. */
icculus@6430
  1195
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1196
#undef SDL_CreateThread
icculus@8094
  1197
#if SDL_DYNAMIC_API
icculus@8094
  1198
        device->thread = SDL_CreateThread_REAL(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1199
#else
icculus@5969
  1200
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1201
#endif
slouken@1330
  1202
#else
icculus@5969
  1203
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1204
#endif
icculus@2049
  1205
        if (device->thread == NULL) {
icculus@9393
  1206
            SDL_CloseAudioDevice(device->id);
slouken@1895
  1207
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1208
            return 0;
icculus@2049
  1209
        }
icculus@2049
  1210
    }
icculus@2049
  1211
icculus@9393
  1212
    return device->id;
icculus@2049
  1213
}
icculus@2049
  1214
icculus@2049
  1215
icculus@2049
  1216
int
slouken@2866
  1217
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1218
{
icculus@2049
  1219
    SDL_AudioDeviceID id = 0;
icculus@2049
  1220
icculus@2049
  1221
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1222
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1223
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
icculus@9382
  1224
            return -1;
slouken@1895
  1225
        }
icculus@2049
  1226
    }
slouken@0
  1227
icculus@2049
  1228
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1229
    if (open_devices[0] != NULL) {
icculus@2049
  1230
        SDL_SetError("Audio device is already opened");
icculus@9382
  1231
        return -1;
slouken@1895
  1232
    }
icculus@2049
  1233
slouken@2866
  1234
    if (obtained) {
slouken@2866
  1235
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1236
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1237
    } else {
slouken@8919
  1238
        id = open_audio_device(NULL, 0, desired, NULL, 0, 1);
slouken@2866
  1239
    }
slouken@21
  1240
icculus@5964
  1241
    SDL_assert((id == 0) || (id == 1));
icculus@9382
  1242
    return (id == 0) ? -1 : 0;
icculus@2049
  1243
}
slouken@21
  1244
icculus@2049
  1245
SDL_AudioDeviceID
icculus@2049
  1246
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1247
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1248
                    int allowed_changes)
icculus@2049
  1249
{
slouken@2866
  1250
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1251
                             allowed_changes, 2);
slouken@1895
  1252
}
slouken@1895
  1253
slouken@3537
  1254
SDL_AudioStatus
icculus@2049
  1255
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1256
{
icculus@2049
  1257
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1258
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1259
    if (device && device->enabled) {
icculus@2049
  1260
        if (device->paused) {
slouken@1895
  1261
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1262
        } else {
slouken@1895
  1263
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1264
        }
slouken@1895
  1265
    }
icculus@9382
  1266
    return status;
slouken@0
  1267
}
slouken@0
  1268
icculus@2049
  1269
slouken@3537
  1270
SDL_AudioStatus
icculus@2049
  1271
SDL_GetAudioStatus(void)
icculus@2049
  1272
{
icculus@2049
  1273
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1274
}
icculus@2049
  1275
icculus@2049
  1276
void
icculus@2049
  1277
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1278
{
icculus@2049
  1279
    SDL_AudioDevice *device = get_audio_device(devid);
gabomdq@9148
  1280
    if (device) {
gabomdq@9148
  1281
        current_audio.impl.LockDevice(device);
icculus@2049
  1282
        device->paused = pause_on;
gabomdq@9148
  1283
        current_audio.impl.UnlockDevice(device);
icculus@2049
  1284
    }
icculus@2049
  1285
}
icculus@2049
  1286
slouken@1895
  1287
void
slouken@1895
  1288
SDL_PauseAudio(int pause_on)
slouken@0
  1289
{
gabomdq@9148
  1290
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1291
}
icculus@2049
  1292
slouken@0
  1293
icculus@2049
  1294
void
icculus@2049
  1295
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1296
{
icculus@2049
  1297
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1298
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1299
    if (device) {
icculus@2049
  1300
        current_audio.impl.LockDevice(device);
slouken@1895
  1301
    }
slouken@0
  1302
}
slouken@0
  1303
slouken@1895
  1304
void
slouken@1895
  1305
SDL_LockAudio(void)
slouken@0
  1306
{
icculus@2049
  1307
    SDL_LockAudioDevice(1);
icculus@2049
  1308
}
slouken@0
  1309
icculus@2049
  1310
void
icculus@2049
  1311
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1312
{
slouken@1895
  1313
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1314
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1315
    if (device) {
icculus@2049
  1316
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1317
    }
slouken@0
  1318
}
slouken@0
  1319
slouken@1895
  1320
void
slouken@1895
  1321
SDL_UnlockAudio(void)
slouken@0
  1322
{
icculus@2049
  1323
    SDL_UnlockAudioDevice(1);
icculus@2049
  1324
}
slouken@0
  1325
icculus@2049
  1326
void
icculus@2049
  1327
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1328
{
icculus@2049
  1329
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1330
    if (device) {
icculus@2049
  1331
        close_audio_device(device);
slouken@2060
  1332
        open_devices[devid - 1] = NULL;
slouken@1895
  1333
    }
slouken@0
  1334
}
slouken@0
  1335
slouken@1895
  1336
void
slouken@1895
  1337
SDL_CloseAudio(void)
slouken@0
  1338
{
icculus@2049
  1339
    SDL_CloseAudioDevice(1);
slouken@0
  1340
}
slouken@0
  1341
slouken@1895
  1342
void
slouken@1895
  1343
SDL_AudioQuit(void)
slouken@0
  1344
{
icculus@7348
  1345
    SDL_AudioDeviceID i;
icculus@7348
  1346
icculus@7345
  1347
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1348
        return;
icculus@7345
  1349
    }
icculus@7345
  1350
icculus@2049
  1351
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1352
        if (open_devices[i] != NULL) {
icculus@7446
  1353
            SDL_CloseAudioDevice(i+1);
icculus@7342
  1354
        }
icculus@2049
  1355
    }
slouken@0
  1356
icculus@9394
  1357
    free_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount);
icculus@9394
  1358
    free_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount);
icculus@9394
  1359
icculus@2049
  1360
    /* Free the driver data */
icculus@2049
  1361
    current_audio.impl.Deinitialize();
icculus@9393
  1362
icculus@9394
  1363
    SDL_DestroyMutex(current_audio.detectionLock);
icculus@9393
  1364
icculus@9393
  1365
    SDL_zero(current_audio);
icculus@9393
  1366
    SDL_zero(open_devices);
slouken@0
  1367
}
slouken@0
  1368
icculus@1982
  1369
#define NUM_FORMATS 10
slouken@0
  1370
static int format_idx;
slouken@0
  1371
static int format_idx_sub;
icculus@1982
  1372
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1373
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1374
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1375
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1376
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1377
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1378
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1379
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1380
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1381
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1382
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1383
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1384
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1385
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1386
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1387
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1388
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1389
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1390
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1391
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1392
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1393
};
slouken@0
  1394
icculus@1982
  1395
SDL_AudioFormat
icculus@1982
  1396
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1397
{
slouken@1895
  1398
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1399
        if (format_list[format_idx][0] == format) {
slouken@1895
  1400
            break;
slouken@1895
  1401
        }
slouken@1895
  1402
    }
slouken@1895
  1403
    format_idx_sub = 0;
icculus@9382
  1404
    return SDL_NextAudioFormat();
slouken@0
  1405
}
slouken@0
  1406
icculus@1982
  1407
SDL_AudioFormat
slouken@1895
  1408
SDL_NextAudioFormat(void)
slouken@0
  1409
{
slouken@1895
  1410
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
icculus@9382
  1411
        return 0;
slouken@1895
  1412
    }
icculus@9382
  1413
    return format_list[format_idx][format_idx_sub++];
slouken@0
  1414
}
slouken@0
  1415
slouken@1895
  1416
void
slouken@1895
  1417
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1418
{
slouken@1895
  1419
    switch (spec->format) {
slouken@1895
  1420
    case AUDIO_U8:
slouken@1895
  1421
        spec->silence = 0x80;
slouken@1895
  1422
        break;
slouken@1895
  1423
    default:
slouken@1895
  1424
        spec->silence = 0x00;
slouken@1895
  1425
        break;
slouken@1895
  1426
    }
icculus@2049
  1427
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1428
    spec->size *= spec->channels;
slouken@1895
  1429
    spec->size *= spec->samples;
slouken@0
  1430
}
slouken@1895
  1431
icculus@2049
  1432
icculus@2049
  1433
/*
icculus@2049
  1434
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1435
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1436
 */
icculus@2049
  1437
void
icculus@2049
  1438
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1439
{
icculus@2049
  1440
    /* Mix the user-level audio format */
icculus@2049
  1441
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1442
    if (device != NULL) {
icculus@2049
  1443
        SDL_AudioFormat format;
icculus@2049
  1444
        if (device->convert.needed) {
icculus@2049
  1445
            format = device->convert.src_format;
icculus@2049
  1446
        } else {
icculus@2049
  1447
            format = device->spec.format;
icculus@2049
  1448
        }
icculus@2049
  1449
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1450
    }
icculus@2049
  1451
}
icculus@2049
  1452
slouken@1895
  1453
/* vi: set ts=4 sw=4 expandtab: */