src/audio/SDL_audio.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 31 Oct 2011 05:56:58 -0400
changeset 6044 35448a5ea044
parent 5969 3a041d215edc
child 6138 4c64952a58fb
permissions -rw-r--r--
Lots of fixes importing SDL source wholesale into a new iOS project
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
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#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#include "SDL_audiomem.h"
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#include "SDL_sysaudio.h"
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#define _THIS SDL_AudioDevice *_this
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static SDL_AudioDriver current_audio;
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static SDL_AudioDevice *open_devices[16];
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/* !!! FIXME: These are wordy and unlocalized... */
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#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
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#define DEFAULT_INPUT_DEVNAME "System audio capture device"
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/*
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 * Not all of these will be compiled and linked in, but it's convenient
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 *  to have a complete list here and saves yet-another block of #ifdefs...
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 *  Please see bootstrap[], below, for the actual #ifdef mess.
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 */
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extern AudioBootStrap BSD_AUDIO_bootstrap;
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extern AudioBootStrap DSP_bootstrap;
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extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
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extern AudioBootStrap ARTS_bootstrap;
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extern AudioBootStrap ESD_bootstrap;
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extern AudioBootStrap NAS_bootstrap;
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extern AudioBootStrap XAUDIO2_bootstrap;
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extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINMM_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
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extern AudioBootStrap BEOSAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
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extern AudioBootStrap DISKAUD_bootstrap;
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extern AudioBootStrap DUMMYAUD_bootstrap;
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extern AudioBootStrap DCAUD_bootstrap;
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extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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    &NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_XAUDIO2
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    &XAUDIO2_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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    &DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINMM
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    &WINMM_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
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    &PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BEOSAUDIO
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    &BEOSAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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    &COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DISK
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    &DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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    &DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NDS
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    &NDSAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_FUSIONSOUND
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    &FUSIONSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ANDROID
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    &ANDROIDAUD_bootstrap,
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#endif
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    NULL
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};
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static SDL_AudioDevice *
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get_audio_device(SDL_AudioDeviceID id)
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{
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    id--;
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    if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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        SDL_SetError("Invalid audio device ID");
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        return NULL;
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    }
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    return open_devices[id];
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}
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/* stubs for audio drivers that don't need a specific entry point... */
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static void
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SDL_AudioDetectDevices_Default(int iscapture, SDL_AddAudioDevice addfn)
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{                               /* no-op. */
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}
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static void
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SDL_AudioThreadInit_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioWaitDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioPlayDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static Uint8 *
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SDL_AudioGetDeviceBuf_Default(_THIS)
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{
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    return NULL;
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}
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static void
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SDL_AudioWaitDone_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioCloseDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioDeinitialize_Default(void)
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{                               /* no-op. */
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}
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static int
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SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
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{
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    return 0;
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}
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static void
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SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_mutexP(device->mixer_lock);
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}
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static void
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SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_mutexV(device->mixer_lock);
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}
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static void
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finalize_audio_entry_points(void)
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{
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    /*
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     * Fill in stub functions for unused driver entry points. This lets us
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     *  blindly call them without having to check for validity first.
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     */
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#define FILL_STUB(x) \
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        if (current_audio.impl.x == NULL) { \
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            current_audio.impl.x = SDL_Audio##x##_Default; \
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        }
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    FILL_STUB(DetectDevices);
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    FILL_STUB(OpenDevice);
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    FILL_STUB(ThreadInit);
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    FILL_STUB(WaitDevice);
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    FILL_STUB(PlayDevice);
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    FILL_STUB(GetDeviceBuf);
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    FILL_STUB(WaitDone);
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    FILL_STUB(CloseDevice);
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    FILL_STUB(LockDevice);
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    FILL_STUB(UnlockDevice);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* Streaming functions (for when the input and output buffer sizes are different) */
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/* Write [length] bytes from buf into the streamer */
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static void
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SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        stream->buffer[stream->write_pos] = buf[i];
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        ++stream->write_pos;
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    }
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}
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/* Read [length] bytes out of the streamer into buf */
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static void
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SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        buf[i] = stream->buffer[stream->read_pos];
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        ++stream->read_pos;
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    }
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}
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static int
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SDL_StreamLength(SDL_AudioStreamer * stream)
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{
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    return (stream->write_pos - stream->read_pos) % stream->max_len;
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}
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/* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */
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#if 0
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static int
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SDL_StreamInit(SDL_AudioStreamer * stream, int max_len, Uint8 silence)
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{
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    /* First try to allocate the buffer */
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    stream->buffer = (Uint8 *) SDL_malloc(max_len);
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    if (stream->buffer == NULL) {
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        return -1;
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    }
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    stream->max_len = max_len;
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    stream->read_pos = 0;
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    stream->write_pos = 0;
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    /* Zero out the buffer */
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    SDL_memset(stream->buffer, silence, max_len);
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    return 0;
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}
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#endif
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/* Deinitialize the stream simply by freeing the buffer */
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static void
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SDL_StreamDeinit(SDL_AudioStreamer * stream)
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{
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    if (stream->buffer != NULL) {
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        SDL_free(stream->buffer);
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    }
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}
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#if defined(ANDROID)
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#include <android/log.h>
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#endif
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/* The general mixing thread function */
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int SDLCALL
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SDL_RunAudio(void *devicep)
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{
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    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
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    Uint8 *stream;
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    int stream_len;
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    void *udata;
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    void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
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    int silence;
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    Uint32 delay;
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    /* For streaming when the buffer sizes don't match up */
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    Uint8 *istream;
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    int istream_len = 0;
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    /* The audio mixing is always a high priority thread */
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    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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    /* Perform any thread setup */
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    device->threadid = SDL_ThreadID();
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    current_audio.impl.ThreadInit(device);
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    /* Set up the mixing function */
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    fill = device->spec.callback;
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    udata = device->spec.userdata;
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    /* By default do not stream */
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    device->use_streamer = 0;
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    if (device->convert.needed) {
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        if (device->convert.src_format == AUDIO_U8) {
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            silence = 0x80;
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        } else {
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            silence = 0;
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        }
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#if 0                           /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
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        /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
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        if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
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            /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
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            stream_max_len = 2 * device->spec.size;
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            if (device->convert.len_mult > device->convert.len_div) {
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                stream_max_len *= device->convert.len_mult;
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                stream_max_len /= device->convert.len_div;
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            }
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            if (SDL_StreamInit(&device->streamer, stream_max_len, silence) <
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                0)
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                return -1;
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            device->use_streamer = 1;
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            /* istream_len should be the length of what we grab from the callback and feed to conversion,
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               so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d
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             */
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            istream_len =
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                device->spec.size * device->convert.len_div /
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                device->convert.len_mult;
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        }
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#endif
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        /* stream_len = device->convert.len; */
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        stream_len = device->spec.size;
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    } else {
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        silence = device->spec.silence;
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        stream_len = device->spec.size;
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    }
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    /* Calculate the delay while paused */
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    delay = ((device->spec.samples * 1000) / device->spec.freq);
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    /* Determine if the streamer is necessary here */
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    if (device->use_streamer == 1) {
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        /* This code is almost the same as the old code. The difference is, instead of reading
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           directly from the callback into "stream", then converting and sending the audio off,
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           we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device.
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           However, reading and writing with streamer are done separately:
slouken@2716
   383
           - We only call the callback and write to the streamer when the streamer does not
slouken@2716
   384
           contain enough samples to output to the device.
slouken@2716
   385
           - We only read from the streamer and tell the device to play when the streamer
slouken@2716
   386
           does have enough samples to output.
slouken@2716
   387
           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   388
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   389
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   390
         */
slouken@2716
   391
        while (device->enabled) {
slouken@3336
   392
slouken@3336
   393
            if (device->paused) {
slouken@3336
   394
                SDL_Delay(delay);
slouken@3336
   395
                continue;
slouken@3336
   396
            }
slouken@3336
   397
slouken@2716
   398
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   399
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   400
                /* Set up istream */
slouken@2716
   401
                if (device->convert.needed) {
slouken@2716
   402
                    if (device->convert.buf) {
slouken@2716
   403
                        istream = device->convert.buf;
slouken@2716
   404
                    } else {
slouken@2716
   405
                        continue;
slouken@2716
   406
                    }
slouken@2716
   407
                } else {
slouken@3336
   408
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   409
 * a device buffer both here and below in the stream output.
slouken@3336
   410
 */
slouken@2716
   411
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   412
                    if (istream == NULL) {
slouken@2716
   413
                        istream = device->fake_stream;
slouken@2716
   414
                    }
slouken@2716
   415
                }
slouken@0
   416
slouken@2716
   417
                /* Read from the callback into the _input_ stream */
slouken@3336
   418
                SDL_mutexP(device->mixer_lock);
slouken@3336
   419
                (*fill) (udata, istream, istream_len);
slouken@3336
   420
                SDL_mutexV(device->mixer_lock);
slouken@2716
   421
slouken@2716
   422
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   423
                if (device->convert.needed) {
slouken@2716
   424
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   425
                    if (istream == NULL) {
slouken@2716
   426
                        istream = device->fake_stream;
slouken@2716
   427
                    }
slouken@2716
   428
                    /*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   429
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   430
                                    device->convert.len_cvt);
slouken@2716
   431
                } else {
slouken@2716
   432
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   433
                }
slouken@1895
   434
            }
slouken@2716
   435
slouken@2716
   436
            /* Only output audio if the streamer has enough to output */
slouken@2716
   437
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   438
                /* Set up the output stream */
slouken@2716
   439
                if (device->convert.needed) {
slouken@2716
   440
                    if (device->convert.buf) {
slouken@2716
   441
                        stream = device->convert.buf;
slouken@2716
   442
                    } else {
slouken@2716
   443
                        continue;
slouken@2716
   444
                    }
slouken@2716
   445
                } else {
slouken@2716
   446
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   447
                    if (stream == NULL) {
slouken@2716
   448
                        stream = device->fake_stream;
slouken@2716
   449
                    }
slouken@2716
   450
                }
slouken@2716
   451
slouken@2716
   452
                /* Now read from the streamer */
slouken@2716
   453
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   454
slouken@2716
   455
                /* Ready current buffer for play and change current buffer */
slouken@3336
   456
                if (stream != device->fake_stream) {
slouken@2716
   457
                    current_audio.impl.PlayDevice(device);
slouken@3096
   458
                    /* Wait for an audio buffer to become available */
slouken@3096
   459
                    current_audio.impl.WaitDevice(device);
slouken@2716
   460
                } else {
slouken@3336
   461
                    SDL_Delay(delay);
slouken@2716
   462
                }
slouken@1895
   463
            }
slouken@0
   464
slouken@1895
   465
        }
slouken@2716
   466
    } else {
slouken@2716
   467
        /* Otherwise, do not use the streamer. This is the old code. */
slouken@0
   468
slouken@2716
   469
        /* Loop, filling the audio buffers */
slouken@2716
   470
        while (device->enabled) {
slouken@2716
   471
slouken@3336
   472
            if (device->paused) {
slouken@3336
   473
                SDL_Delay(delay);
slouken@3336
   474
                continue;
slouken@3336
   475
            }
slouken@3336
   476
slouken@2716
   477
            /* Fill the current buffer with sound */
slouken@2716
   478
            if (device->convert.needed) {
slouken@2716
   479
                if (device->convert.buf) {
slouken@2716
   480
                    stream = device->convert.buf;
slouken@2716
   481
                } else {
slouken@2716
   482
                    continue;
slouken@2716
   483
                }
slouken@2716
   484
            } else {
slouken@2716
   485
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   486
                if (stream == NULL) {
slouken@2716
   487
                    stream = device->fake_stream;
slouken@2716
   488
                }
slouken@1895
   489
            }
slouken@0
   490
slouken@3336
   491
            SDL_mutexP(device->mixer_lock);
slouken@3336
   492
            (*fill) (udata, stream, stream_len);
slouken@3336
   493
            SDL_mutexV(device->mixer_lock);
slouken@1562
   494
slouken@2716
   495
            /* Convert the audio if necessary */
slouken@2716
   496
            if (device->convert.needed) {
slouken@2716
   497
                SDL_ConvertAudio(&device->convert);
slouken@2716
   498
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   499
                if (stream == NULL) {
slouken@2716
   500
                    stream = device->fake_stream;
slouken@2716
   501
                }
slouken@2716
   502
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   503
                           device->convert.len_cvt);
slouken@2716
   504
            }
slouken@2716
   505
slouken@2716
   506
            /* Ready current buffer for play and change current buffer */
slouken@3336
   507
            if (stream != device->fake_stream) {
slouken@2716
   508
                current_audio.impl.PlayDevice(device);
slouken@3096
   509
                /* Wait for an audio buffer to become available */
slouken@3096
   510
                current_audio.impl.WaitDevice(device);
slouken@2716
   511
            } else {
slouken@3336
   512
                SDL_Delay(delay);
slouken@2716
   513
            }
slouken@1895
   514
        }
slouken@1895
   515
    }
slouken@1562
   516
slouken@1895
   517
    /* Wait for the audio to drain.. */
icculus@2049
   518
    current_audio.impl.WaitDone(device);
slouken@21
   519
slouken@2716
   520
    /* If necessary, deinit the streamer */
slouken@2716
   521
    if (device->use_streamer == 1)
slouken@2716
   522
        SDL_StreamDeinit(&device->streamer);
slouken@2716
   523
slouken@1895
   524
    return (0);
slouken@0
   525
}
slouken@0
   526
slouken@322
   527
icculus@1982
   528
static SDL_AudioFormat
slouken@1895
   529
SDL_ParseAudioFormat(const char *string)
slouken@1794
   530
{
icculus@2076
   531
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   532
    CHECK_FMT_STRING(U8);
icculus@2049
   533
    CHECK_FMT_STRING(S8);
icculus@2049
   534
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   535
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   536
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   537
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   538
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   539
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   540
    CHECK_FMT_STRING(U16);
icculus@2049
   541
    CHECK_FMT_STRING(S16);
icculus@2049
   542
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   543
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   544
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   545
    CHECK_FMT_STRING(S32);
icculus@2049
   546
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   547
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   548
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   549
    CHECK_FMT_STRING(F32);
slouken@2060
   550
#undef CHECK_FMT_STRING
icculus@2049
   551
    return 0;
slouken@1895
   552
}
slouken@1895
   553
slouken@1895
   554
int
slouken@1895
   555
SDL_GetNumAudioDrivers(void)
slouken@1895
   556
{
slouken@1895
   557
    return (SDL_arraysize(bootstrap) - 1);
slouken@1895
   558
}
slouken@1895
   559
slouken@1895
   560
const char *
slouken@1895
   561
SDL_GetAudioDriver(int index)
slouken@1895
   562
{
slouken@1895
   563
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
slouken@1895
   564
        return (bootstrap[index]->name);
slouken@1895
   565
    }
slouken@1895
   566
    return (NULL);
slouken@1794
   567
}
slouken@1794
   568
slouken@1895
   569
int
slouken@1895
   570
SDL_AudioInit(const char *driver_name)
slouken@0
   571
{
icculus@2049
   572
    int i = 0;
icculus@2049
   573
    int initialized = 0;
icculus@2049
   574
    int tried_to_init = 0;
slouken@0
   575
icculus@2049
   576
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   577
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   578
    }
slouken@0
   579
slouken@2060
   580
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   581
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   582
slouken@1895
   583
    /* Select the proper audio driver */
slouken@1909
   584
    if (driver_name == NULL) {
slouken@1909
   585
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   586
    }
icculus@2049
   587
icculus@2049
   588
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   589
        /* make sure we should even try this driver before doing so... */
icculus@2049
   590
        const AudioBootStrap *backend = bootstrap[i];
slouken@2060
   591
        if (((driver_name) && (SDL_strcasecmp(backend->name, driver_name))) ||
slouken@2060
   592
            ((!driver_name) && (backend->demand_only))) {
icculus@2049
   593
            continue;
icculus@2049
   594
        }
slouken@0
   595
icculus@2049
   596
        tried_to_init = 1;
slouken@2060
   597
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   598
        current_audio.name = backend->name;
icculus@2049
   599
        current_audio.desc = backend->desc;
icculus@3699
   600
        initialized = backend->init(&current_audio.impl);
slouken@1895
   601
    }
icculus@2049
   602
icculus@2049
   603
    if (!initialized) {
icculus@2049
   604
        /* specific drivers will set the error message if they fail... */
icculus@2049
   605
        if (!tried_to_init) {
slouken@1895
   606
            if (driver_name) {
icculus@3699
   607
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   608
            } else {
slouken@1895
   609
                SDL_SetError("No available audio device");
slouken@1895
   610
            }
slouken@1895
   611
        }
icculus@2049
   612
slouken@2060
   613
        SDL_memset(&current_audio, 0, sizeof(current_audio));
slouken@2060
   614
        return (-1);            /* No driver was available, so fail. */
slouken@1895
   615
    }
icculus@2049
   616
icculus@2049
   617
    finalize_audio_entry_points();
icculus@2049
   618
slouken@1895
   619
    return (0);
slouken@0
   620
}
slouken@0
   621
slouken@1895
   622
/*
slouken@1895
   623
 * Get the current audio driver name
slouken@1895
   624
 */
slouken@1895
   625
const char *
slouken@1895
   626
SDL_GetCurrentAudioDriver()
slouken@0
   627
{
icculus@2049
   628
    return current_audio.name;
slouken@0
   629
}
slouken@0
   630
icculus@5593
   631
static void
icculus@5593
   632
free_device_list(char ***devices, int *devCount)
icculus@5593
   633
{
icculus@5593
   634
    int i = *devCount;
icculus@5593
   635
    if ((i > 0) && (*devices != NULL)) {
icculus@5593
   636
        while (i--) {
icculus@5593
   637
            SDL_free((*devices)[i]);
icculus@5593
   638
        }
icculus@5593
   639
    }
icculus@5593
   640
icculus@5593
   641
    if (*devices != NULL) {
icculus@5593
   642
        SDL_free(*devices);
icculus@5593
   643
    }
icculus@5593
   644
icculus@5593
   645
    *devices = NULL;
icculus@5593
   646
    *devCount = 0;
icculus@5593
   647
}
icculus@5593
   648
icculus@5593
   649
static
icculus@5593
   650
void SDL_AddCaptureAudioDevice(const char *_name)
icculus@5593
   651
{
icculus@5593
   652
    char *name = NULL;
icculus@5593
   653
    void *ptr = SDL_realloc(current_audio.inputDevices,
icculus@5593
   654
                          (current_audio.inputDeviceCount+1) * sizeof(char*));
icculus@5593
   655
    if (ptr == NULL) {
icculus@5593
   656
        return;  /* oh well. */
icculus@5593
   657
    }
icculus@5593
   658
icculus@5593
   659
    current_audio.inputDevices = (char **) ptr;
icculus@5593
   660
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   661
    current_audio.inputDevices[current_audio.inputDeviceCount++] = name;
icculus@5593
   662
}
icculus@5593
   663
icculus@5593
   664
static
icculus@5593
   665
void SDL_AddOutputAudioDevice(const char *_name)
icculus@5593
   666
{
icculus@5593
   667
    char *name = NULL;
icculus@5593
   668
    void *ptr = SDL_realloc(current_audio.outputDevices,
icculus@5593
   669
                          (current_audio.outputDeviceCount+1) * sizeof(char*));
icculus@5593
   670
    if (ptr == NULL) {
icculus@5593
   671
        return;  /* oh well. */
icculus@5593
   672
    }
icculus@5593
   673
icculus@5593
   674
    current_audio.outputDevices = (char **) ptr;
icculus@5593
   675
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   676
    current_audio.outputDevices[current_audio.outputDeviceCount++] = name;
icculus@5593
   677
}
icculus@5593
   678
icculus@2049
   679
slouken@1895
   680
int
icculus@2049
   681
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   682
{
icculus@5593
   683
    int retval = 0;
icculus@5593
   684
icculus@2049
   685
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   686
        return -1;
icculus@2049
   687
    }
icculus@5593
   688
icculus@2049
   689
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   690
        return 0;
icculus@2049
   691
    }
icculus@2049
   692
icculus@2049
   693
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   694
        return 1;
icculus@2049
   695
    }
icculus@2049
   696
icculus@2049
   697
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   698
        return 1;
icculus@2049
   699
    }
icculus@2049
   700
icculus@5593
   701
    if (iscapture) {
icculus@5593
   702
        free_device_list(&current_audio.inputDevices,
icculus@5593
   703
                         &current_audio.inputDeviceCount);
icculus@5593
   704
        current_audio.impl.DetectDevices(iscapture, SDL_AddCaptureAudioDevice);
icculus@5593
   705
        retval = current_audio.inputDeviceCount;
icculus@5593
   706
    } else {
icculus@5593
   707
        free_device_list(&current_audio.outputDevices,
icculus@5593
   708
                         &current_audio.outputDeviceCount);
icculus@5593
   709
        current_audio.impl.DetectDevices(iscapture, SDL_AddOutputAudioDevice);
icculus@5593
   710
        retval = current_audio.outputDeviceCount;
icculus@5593
   711
    }
icculus@5593
   712
icculus@5593
   713
    return retval;
icculus@2049
   714
}
icculus@2049
   715
slouken@0
   716
icculus@2049
   717
const char *
icculus@2049
   718
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   719
{
icculus@2049
   720
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   721
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   722
        return NULL;
icculus@2049
   723
    }
icculus@2049
   724
icculus@2049
   725
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   726
        SDL_SetError("No capture support");
icculus@2049
   727
        return NULL;
slouken@1895
   728
    }
icculus@2049
   729
icculus@2049
   730
    if (index < 0) {
icculus@5593
   731
        goto no_such_device;
icculus@2049
   732
    }
slouken@0
   733
icculus@2049
   734
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   735
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   736
    }
icculus@2049
   737
icculus@2049
   738
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   739
        return DEFAULT_OUTPUT_DEVNAME;
slouken@1895
   740
    }
slouken@262
   741
icculus@5593
   742
    if (iscapture) {
icculus@5593
   743
        if (index >= current_audio.inputDeviceCount) {
icculus@5593
   744
            goto no_such_device;
icculus@5593
   745
        }
icculus@5593
   746
        return current_audio.inputDevices[index];
icculus@5593
   747
    } else {
icculus@5593
   748
        if (index >= current_audio.outputDeviceCount) {
icculus@5593
   749
            goto no_such_device;
icculus@5593
   750
        }
icculus@5593
   751
        return current_audio.outputDevices[index];
icculus@5593
   752
    }
icculus@5593
   753
icculus@5593
   754
no_such_device:
icculus@5593
   755
    SDL_SetError("No such device");
icculus@5593
   756
    return NULL;
icculus@2049
   757
}
icculus@2049
   758
icculus@2049
   759
icculus@2049
   760
static void
slouken@2060
   761
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   762
{
icculus@2049
   763
    device->enabled = 0;
icculus@2049
   764
    if (device->thread != NULL) {
icculus@2049
   765
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   766
    }
icculus@2049
   767
    if (device->mixer_lock != NULL) {
icculus@2049
   768
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   769
    }
icculus@2049
   770
    if (device->fake_stream != NULL) {
icculus@2049
   771
        SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   772
    }
icculus@2049
   773
    if (device->convert.needed) {
icculus@2049
   774
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   775
    }
icculus@2049
   776
    if (device->opened) {
icculus@2049
   777
        current_audio.impl.CloseDevice(device);
icculus@2049
   778
        device->opened = 0;
icculus@2049
   779
    }
icculus@2049
   780
    SDL_FreeAudioMem(device);
icculus@2049
   781
}
icculus@2049
   782
icculus@2049
   783
icculus@2049
   784
/*
icculus@2049
   785
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   786
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   787
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   788
 */
icculus@2049
   789
static int
slouken@2060
   790
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   791
{
slouken@2060
   792
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   793
icculus@2049
   794
    if (orig->callback == NULL) {
icculus@2049
   795
        SDL_SetError("SDL_OpenAudio() passed a NULL callback");
icculus@2049
   796
        return 0;
icculus@2049
   797
    }
icculus@2049
   798
icculus@2049
   799
    if (orig->freq == 0) {
icculus@2049
   800
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   801
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   802
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   803
        }
slouken@1895
   804
    }
icculus@2049
   805
icculus@2049
   806
    if (orig->format == 0) {
icculus@2049
   807
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   808
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   809
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
   810
        }
slouken@1895
   811
    }
icculus@2049
   812
icculus@2049
   813
    switch (orig->channels) {
slouken@2060
   814
    case 0:{
slouken@2060
   815
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   816
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   817
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   818
            }
slouken@2060
   819
            break;
icculus@2049
   820
        }
slouken@1895
   821
    case 1:                    /* Mono */
slouken@1895
   822
    case 2:                    /* Stereo */
slouken@1895
   823
    case 4:                    /* surround */
slouken@1895
   824
    case 6:                    /* surround with center and lfe */
slouken@1895
   825
        break;
slouken@1895
   826
    default:
icculus@2049
   827
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   828
        return 0;
slouken@1895
   829
    }
icculus@2049
   830
icculus@2049
   831
    if (orig->samples == 0) {
icculus@2049
   832
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   833
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   834
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   835
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   836
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   837
            int power2 = 1;
icculus@2049
   838
            while (power2 < samples) {
icculus@2049
   839
                power2 *= 2;
icculus@2049
   840
            }
icculus@2049
   841
            prepared->samples = power2;
slouken@1895
   842
        }
slouken@1895
   843
    }
slouken@0
   844
slouken@1895
   845
    /* Calculate the silence and size of the audio specification */
icculus@2049
   846
    SDL_CalculateAudioSpec(prepared);
slouken@21
   847
icculus@2049
   848
    return 1;
icculus@2049
   849
}
slouken@1408
   850
slouken@21
   851
icculus@2049
   852
static SDL_AudioDeviceID
icculus@2049
   853
open_audio_device(const char *devname, int iscapture,
slouken@2866
   854
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   855
                  int allowed_changes, int min_id)
icculus@2049
   856
{
icculus@2049
   857
    SDL_AudioDeviceID id = 0;
slouken@2866
   858
    SDL_AudioSpec _obtained;
icculus@2049
   859
    SDL_AudioDevice *device;
slouken@2866
   860
    SDL_bool build_cvt;
icculus@2049
   861
    int i = 0;
slouken@21
   862
icculus@2049
   863
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   864
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   865
        return 0;
icculus@2049
   866
    }
icculus@2049
   867
icculus@2049
   868
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   869
        SDL_SetError("No capture support");
icculus@2049
   870
        return 0;
icculus@2049
   871
    }
icculus@2049
   872
slouken@2866
   873
    if (!obtained) {
slouken@2866
   874
        obtained = &_obtained;
slouken@2866
   875
    }
slouken@2866
   876
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   877
        return 0;
icculus@2049
   878
    }
icculus@2049
   879
icculus@2049
   880
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
   881
    if (devname == NULL) {
icculus@2049
   882
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
   883
    }
slouken@21
   884
icculus@2049
   885
    /*
icculus@2049
   886
     * Catch device names at the high level for the simple case...
icculus@2049
   887
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
   888
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
   889
     *  always NULL when it hits the low level.
icculus@2049
   890
     *
icculus@2049
   891
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
   892
     *  opens of the default system device.
icculus@2049
   893
     */
icculus@2049
   894
icculus@2049
   895
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   896
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
   897
            SDL_SetError("No such device");
icculus@2049
   898
            return 0;
icculus@2049
   899
        }
icculus@2049
   900
        devname = NULL;
icculus@2049
   901
icculus@2049
   902
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   903
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
   904
                SDL_SetError("Audio device already open");
icculus@2049
   905
                return 0;
icculus@2049
   906
            }
icculus@2049
   907
        }
icculus@2049
   908
    }
icculus@2049
   909
icculus@2049
   910
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   911
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
   912
            SDL_SetError("No such device");
icculus@2049
   913
            return 0;
icculus@2049
   914
        }
icculus@2049
   915
        devname = NULL;
icculus@2049
   916
icculus@2049
   917
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   918
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
   919
                SDL_SetError("Audio device already open");
icculus@2049
   920
                return 0;
icculus@2049
   921
            }
icculus@2049
   922
        }
icculus@2049
   923
    }
icculus@2049
   924
slouken@2060
   925
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
   926
    if (device == NULL) {
icculus@2049
   927
        SDL_OutOfMemory();
icculus@2049
   928
        return 0;
icculus@2049
   929
    }
slouken@2060
   930
    SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
slouken@2866
   931
    device->spec = *obtained;
icculus@2049
   932
    device->enabled = 1;
icculus@2049
   933
    device->paused = 1;
icculus@2049
   934
    device->iscapture = iscapture;
icculus@2049
   935
icculus@2049
   936
    /* Create a semaphore for locking the sound buffers */
icculus@2049
   937
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
   938
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
   939
        if (device->mixer_lock == NULL) {
icculus@2049
   940
            close_audio_device(device);
icculus@2049
   941
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
   942
            return 0;
icculus@2049
   943
        }
icculus@2049
   944
    }
icculus@2049
   945
icculus@5593
   946
    /* force a device detection if we haven't done one yet. */
icculus@5593
   947
    if ( ((iscapture) && (current_audio.inputDevices == NULL)) ||
icculus@5593
   948
         ((!iscapture) && (current_audio.outputDevices == NULL)) )
icculus@5593
   949
        SDL_GetNumAudioDevices(iscapture);
icculus@5593
   950
icculus@2049
   951
    if (!current_audio.impl.OpenDevice(device, devname, iscapture)) {
icculus@2049
   952
        close_audio_device(device);
icculus@2049
   953
        return 0;
icculus@2049
   954
    }
icculus@2049
   955
    device->opened = 1;
slouken@0
   956
slouken@1895
   957
    /* Allocate a fake audio memory buffer */
aschiffler@4865
   958
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
   959
    if (device->fake_stream == NULL) {
icculus@2049
   960
        close_audio_device(device);
slouken@1895
   961
        SDL_OutOfMemory();
icculus@2049
   962
        return 0;
slouken@1895
   963
    }
slouken@0
   964
slouken@2866
   965
    /* If the audio driver changes the buffer size, accept it */
slouken@2866
   966
    if (device->spec.samples != obtained->samples) {
slouken@2866
   967
        obtained->samples = device->spec.samples;
slouken@2866
   968
        SDL_CalculateAudioSpec(obtained);
slouken@2866
   969
    }
slouken@2866
   970
slouken@1895
   971
    /* See if we need to do any conversion */
slouken@2866
   972
    build_cvt = SDL_FALSE;
slouken@2866
   973
    if (obtained->freq != device->spec.freq) {
slouken@2866
   974
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
   975
            obtained->freq = device->spec.freq;
slouken@2866
   976
        } else {
slouken@2866
   977
            build_cvt = SDL_TRUE;
slouken@2866
   978
        }
slouken@2866
   979
    }
slouken@2866
   980
    if (obtained->format != device->spec.format) {
slouken@2866
   981
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
   982
            obtained->format = device->spec.format;
slouken@2866
   983
        } else {
slouken@2866
   984
            build_cvt = SDL_TRUE;
slouken@2866
   985
        }
slouken@2866
   986
    }
slouken@2866
   987
    if (obtained->channels != device->spec.channels) {
slouken@2866
   988
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
   989
            obtained->channels = device->spec.channels;
slouken@2866
   990
        } else {
slouken@2866
   991
            build_cvt = SDL_TRUE;
slouken@2866
   992
        }
slouken@2866
   993
    }
slouken@2866
   994
    if (build_cvt) {
slouken@1895
   995
        /* Build an audio conversion block */
icculus@2049
   996
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
   997
                              obtained->format, obtained->channels,
slouken@2866
   998
                              obtained->freq,
icculus@2049
   999
                              device->spec.format, device->spec.channels,
icculus@2049
  1000
                              device->spec.freq) < 0) {
icculus@2049
  1001
            close_audio_device(device);
icculus@2049
  1002
            return 0;
slouken@1895
  1003
        }
icculus@2049
  1004
        if (device->convert.needed) {
slouken@2866
  1005
            device->convert.len = (int) (((double) obtained->size) /
slouken@2060
  1006
                                         device->convert.len_ratio);
icculus@2053
  1007
icculus@2049
  1008
            device->convert.buf =
icculus@2049
  1009
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1010
                                            device->convert.len_mult);
icculus@2049
  1011
            if (device->convert.buf == NULL) {
icculus@2049
  1012
                close_audio_device(device);
slouken@1895
  1013
                SDL_OutOfMemory();
icculus@2049
  1014
                return 0;
slouken@1895
  1015
            }
slouken@1895
  1016
        }
slouken@1895
  1017
    }
icculus@2049
  1018
icculus@2049
  1019
    /* Find an available device ID and store the structure... */
slouken@2060
  1020
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
  1021
        if (open_devices[id] == NULL) {
icculus@2049
  1022
            open_devices[id] = device;
icculus@2049
  1023
            break;
icculus@2049
  1024
        }
icculus@2049
  1025
    }
icculus@2049
  1026
icculus@2049
  1027
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
  1028
        SDL_SetError("Too many open audio devices");
icculus@2049
  1029
        close_audio_device(device);
icculus@2049
  1030
        return 0;
icculus@2049
  1031
    }
icculus@2049
  1032
slouken@1895
  1033
    /* Start the audio thread if necessary */
icculus@2049
  1034
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1035
        /* Start the audio thread */
icculus@5969
  1036
        char name[64];
icculus@5969
  1037
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) (id + 1));
icculus@2049
  1038
/* !!! FIXME: this is nasty. */
slouken@5086
  1039
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
slouken@1330
  1040
#undef SDL_CreateThread
icculus@5969
  1041
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
slouken@1330
  1042
#else
icculus@5969
  1043
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1044
#endif
icculus@2049
  1045
        if (device->thread == NULL) {
slouken@2060
  1046
            SDL_CloseAudioDevice(id + 1);
slouken@1895
  1047
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1048
            return 0;
icculus@2049
  1049
        }
icculus@2049
  1050
    }
icculus@2049
  1051
slouken@2060
  1052
    return id + 1;
icculus@2049
  1053
}
icculus@2049
  1054
icculus@2049
  1055
icculus@2049
  1056
int
slouken@2866
  1057
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1058
{
icculus@2049
  1059
    SDL_AudioDeviceID id = 0;
icculus@2049
  1060
icculus@2049
  1061
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1062
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1063
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
slouken@1895
  1064
            return (-1);
slouken@1895
  1065
        }
icculus@2049
  1066
    }
slouken@0
  1067
icculus@2049
  1068
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1069
    if (open_devices[0] != NULL) {
icculus@2049
  1070
        SDL_SetError("Audio device is already opened");
icculus@2049
  1071
        return (-1);
slouken@1895
  1072
    }
icculus@2049
  1073
slouken@2866
  1074
    if (obtained) {
slouken@2866
  1075
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1076
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1077
    } else {
slouken@2866
  1078
        id = open_audio_device(NULL, 0, desired, desired, 0, 1);
slouken@2866
  1079
    }
slouken@21
  1080
icculus@5964
  1081
    SDL_assert((id == 0) || (id == 1));
icculus@2049
  1082
    return ((id == 0) ? -1 : 0);
icculus@2049
  1083
}
slouken@21
  1084
icculus@2049
  1085
SDL_AudioDeviceID
icculus@2049
  1086
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1087
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1088
                    int allowed_changes)
icculus@2049
  1089
{
slouken@2866
  1090
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1091
                             allowed_changes, 2);
slouken@1895
  1092
}
slouken@1895
  1093
slouken@3537
  1094
SDL_AudioStatus
icculus@2049
  1095
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1096
{
icculus@2049
  1097
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1098
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1099
    if (device && device->enabled) {
icculus@2049
  1100
        if (device->paused) {
slouken@1895
  1101
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1102
        } else {
slouken@1895
  1103
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1104
        }
slouken@1895
  1105
    }
slouken@1895
  1106
    return (status);
slouken@0
  1107
}
slouken@0
  1108
icculus@2049
  1109
slouken@3537
  1110
SDL_AudioStatus
icculus@2049
  1111
SDL_GetAudioStatus(void)
icculus@2049
  1112
{
icculus@2049
  1113
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1114
}
icculus@2049
  1115
icculus@2049
  1116
void
icculus@2049
  1117
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1118
{
icculus@2049
  1119
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1120
    if (device) {
icculus@2049
  1121
        device->paused = pause_on;
icculus@2049
  1122
    }
icculus@2049
  1123
}
icculus@2049
  1124
slouken@1895
  1125
void
slouken@1895
  1126
SDL_PauseAudio(int pause_on)
slouken@0
  1127
{
icculus@2049
  1128
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1129
}
icculus@2049
  1130
slouken@0
  1131
icculus@2049
  1132
void
icculus@2049
  1133
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1134
{
icculus@2049
  1135
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1136
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1137
    if (device) {
icculus@2049
  1138
        current_audio.impl.LockDevice(device);
slouken@1895
  1139
    }
slouken@0
  1140
}
slouken@0
  1141
slouken@1895
  1142
void
slouken@1895
  1143
SDL_LockAudio(void)
slouken@0
  1144
{
icculus@2049
  1145
    SDL_LockAudioDevice(1);
icculus@2049
  1146
}
slouken@0
  1147
icculus@2049
  1148
void
icculus@2049
  1149
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1150
{
slouken@1895
  1151
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1152
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1153
    if (device) {
icculus@2049
  1154
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1155
    }
slouken@0
  1156
}
slouken@0
  1157
slouken@1895
  1158
void
slouken@1895
  1159
SDL_UnlockAudio(void)
slouken@0
  1160
{
icculus@2049
  1161
    SDL_UnlockAudioDevice(1);
icculus@2049
  1162
}
slouken@0
  1163
icculus@2049
  1164
void
icculus@2049
  1165
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1166
{
icculus@2049
  1167
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1168
    if (device) {
icculus@2049
  1169
        close_audio_device(device);
slouken@2060
  1170
        open_devices[devid - 1] = NULL;
slouken@1895
  1171
    }
slouken@0
  1172
}
slouken@0
  1173
slouken@1895
  1174
void
slouken@1895
  1175
SDL_CloseAudio(void)
slouken@0
  1176
{
icculus@2049
  1177
    SDL_CloseAudioDevice(1);
slouken@0
  1178
}
slouken@0
  1179
slouken@1895
  1180
void
slouken@1895
  1181
SDL_AudioQuit(void)
slouken@0
  1182
{
icculus@2049
  1183
    SDL_AudioDeviceID i;
icculus@2049
  1184
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1185
        SDL_CloseAudioDevice(i);
icculus@2049
  1186
    }
slouken@0
  1187
icculus@2049
  1188
    /* Free the driver data */
icculus@2049
  1189
    current_audio.impl.Deinitialize();
icculus@5593
  1190
    free_device_list(&current_audio.outputDevices,
icculus@5593
  1191
                     &current_audio.outputDeviceCount);
icculus@5593
  1192
    free_device_list(&current_audio.inputDevices,
icculus@5593
  1193
                     &current_audio.inputDeviceCount);
slouken@2060
  1194
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1195
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1196
}
slouken@0
  1197
icculus@1982
  1198
#define NUM_FORMATS 10
slouken@0
  1199
static int format_idx;
slouken@0
  1200
static int format_idx_sub;
icculus@1982
  1201
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1202
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1203
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1204
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1205
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1206
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1207
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1208
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1209
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1210
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1211
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1212
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1213
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1214
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1215
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1216
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1217
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1218
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1219
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1220
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1221
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1222
};
slouken@0
  1223
icculus@1982
  1224
SDL_AudioFormat
icculus@1982
  1225
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1226
{
slouken@1895
  1227
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1228
        if (format_list[format_idx][0] == format) {
slouken@1895
  1229
            break;
slouken@1895
  1230
        }
slouken@1895
  1231
    }
slouken@1895
  1232
    format_idx_sub = 0;
slouken@1895
  1233
    return (SDL_NextAudioFormat());
slouken@0
  1234
}
slouken@0
  1235
icculus@1982
  1236
SDL_AudioFormat
slouken@1895
  1237
SDL_NextAudioFormat(void)
slouken@0
  1238
{
slouken@1895
  1239
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
slouken@1895
  1240
        return (0);
slouken@1895
  1241
    }
slouken@1895
  1242
    return (format_list[format_idx][format_idx_sub++]);
slouken@0
  1243
}
slouken@0
  1244
slouken@1895
  1245
void
slouken@1895
  1246
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1247
{
slouken@1895
  1248
    switch (spec->format) {
slouken@1895
  1249
    case AUDIO_U8:
slouken@1895
  1250
        spec->silence = 0x80;
slouken@1895
  1251
        break;
slouken@1895
  1252
    default:
slouken@1895
  1253
        spec->silence = 0x00;
slouken@1895
  1254
        break;
slouken@1895
  1255
    }
icculus@2049
  1256
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1257
    spec->size *= spec->channels;
slouken@1895
  1258
    spec->size *= spec->samples;
slouken@0
  1259
}
slouken@1895
  1260
icculus@2049
  1261
icculus@2049
  1262
/*
icculus@2049
  1263
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1264
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1265
 */
icculus@2049
  1266
void
icculus@2049
  1267
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1268
{
icculus@2049
  1269
    /* Mix the user-level audio format */
icculus@2049
  1270
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1271
    if (device != NULL) {
icculus@2049
  1272
        SDL_AudioFormat format;
icculus@2049
  1273
        if (device->convert.needed) {
icculus@2049
  1274
            format = device->convert.src_format;
icculus@2049
  1275
        } else {
icculus@2049
  1276
            format = device->spec.format;
icculus@2049
  1277
        }
icculus@2049
  1278
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1279
    }
icculus@2049
  1280
}
icculus@2049
  1281
slouken@1895
  1282
/* vi: set ts=4 sw=4 expandtab: */