src/audio/SDL_audio.c
author Captain Lex
Sun, 17 Mar 2013 20:07:02 +0800
changeset 7009 161b7b6a5303
parent 6977 b73d51026c68
child 7011 82bbfbbc720e
permissions -rw-r--r--
Add PSP support
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 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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extern AudioBootStrap PSPAUD_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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#if SDL_AUDIO_DRIVER_PSP
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    &PSPAUD_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_LockMutex(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_UnlockMutex(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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    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 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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        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:
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           - We only call the callback and write to the streamer when the streamer does not
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           contain enough samples to output to the device.
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           - We only read from the streamer and tell the device to play when the streamer
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           does have enough samples to output.
slouken@2716
   382
           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   383
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   384
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   385
         */
slouken@2716
   386
        while (device->enabled) {
slouken@3336
   387
slouken@3336
   388
            if (device->paused) {
slouken@3336
   389
                SDL_Delay(delay);
slouken@3336
   390
                continue;
slouken@3336
   391
            }
slouken@3336
   392
slouken@2716
   393
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   394
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   395
                /* Set up istream */
slouken@2716
   396
                if (device->convert.needed) {
slouken@2716
   397
                    if (device->convert.buf) {
slouken@2716
   398
                        istream = device->convert.buf;
slouken@2716
   399
                    } else {
slouken@2716
   400
                        continue;
slouken@2716
   401
                    }
slouken@2716
   402
                } else {
slouken@3336
   403
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   404
 * a device buffer both here and below in the stream output.
slouken@3336
   405
 */
slouken@2716
   406
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   407
                    if (istream == NULL) {
slouken@2716
   408
                        istream = device->fake_stream;
slouken@2716
   409
                    }
slouken@2716
   410
                }
slouken@0
   411
slouken@2716
   412
                /* Read from the callback into the _input_ stream */
slouken@6977
   413
                SDL_LockMutex(device->mixer_lock);
slouken@3336
   414
                (*fill) (udata, istream, istream_len);
slouken@6977
   415
                SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   416
slouken@2716
   417
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   418
                if (device->convert.needed) {
slouken@2716
   419
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   420
                    if (istream == NULL) {
slouken@2716
   421
                        istream = device->fake_stream;
slouken@2716
   422
                    }
slouken@2716
   423
                    /*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   424
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   425
                                    device->convert.len_cvt);
slouken@2716
   426
                } else {
slouken@2716
   427
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   428
                }
slouken@1895
   429
            }
slouken@2716
   430
slouken@2716
   431
            /* Only output audio if the streamer has enough to output */
slouken@2716
   432
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   433
                /* Set up the output stream */
slouken@2716
   434
                if (device->convert.needed) {
slouken@2716
   435
                    if (device->convert.buf) {
slouken@2716
   436
                        stream = device->convert.buf;
slouken@2716
   437
                    } else {
slouken@2716
   438
                        continue;
slouken@2716
   439
                    }
slouken@2716
   440
                } else {
slouken@2716
   441
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   442
                    if (stream == NULL) {
slouken@2716
   443
                        stream = device->fake_stream;
slouken@2716
   444
                    }
slouken@2716
   445
                }
slouken@2716
   446
slouken@2716
   447
                /* Now read from the streamer */
slouken@2716
   448
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   449
slouken@2716
   450
                /* Ready current buffer for play and change current buffer */
slouken@3336
   451
                if (stream != device->fake_stream) {
slouken@2716
   452
                    current_audio.impl.PlayDevice(device);
slouken@3096
   453
                    /* Wait for an audio buffer to become available */
slouken@3096
   454
                    current_audio.impl.WaitDevice(device);
slouken@2716
   455
                } else {
slouken@3336
   456
                    SDL_Delay(delay);
slouken@2716
   457
                }
slouken@1895
   458
            }
slouken@0
   459
slouken@1895
   460
        }
slouken@2716
   461
    } else {
slouken@2716
   462
        /* Otherwise, do not use the streamer. This is the old code. */
slouken@0
   463
slouken@2716
   464
        /* Loop, filling the audio buffers */
slouken@2716
   465
        while (device->enabled) {
slouken@2716
   466
slouken@3336
   467
            if (device->paused) {
slouken@3336
   468
                SDL_Delay(delay);
slouken@3336
   469
                continue;
slouken@3336
   470
            }
slouken@3336
   471
slouken@2716
   472
            /* Fill the current buffer with sound */
slouken@2716
   473
            if (device->convert.needed) {
slouken@2716
   474
                if (device->convert.buf) {
slouken@2716
   475
                    stream = device->convert.buf;
slouken@2716
   476
                } else {
slouken@2716
   477
                    continue;
slouken@2716
   478
                }
slouken@2716
   479
            } else {
slouken@2716
   480
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   481
                if (stream == NULL) {
slouken@2716
   482
                    stream = device->fake_stream;
slouken@2716
   483
                }
slouken@1895
   484
            }
slouken@0
   485
slouken@6977
   486
            SDL_LockMutex(device->mixer_lock);
slouken@3336
   487
            (*fill) (udata, stream, stream_len);
slouken@6977
   488
            SDL_UnlockMutex(device->mixer_lock);
slouken@1562
   489
slouken@2716
   490
            /* Convert the audio if necessary */
slouken@2716
   491
            if (device->convert.needed) {
slouken@2716
   492
                SDL_ConvertAudio(&device->convert);
slouken@2716
   493
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   494
                if (stream == NULL) {
slouken@2716
   495
                    stream = device->fake_stream;
slouken@2716
   496
                }
slouken@2716
   497
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   498
                           device->convert.len_cvt);
slouken@2716
   499
            }
slouken@2716
   500
slouken@2716
   501
            /* Ready current buffer for play and change current buffer */
slouken@3336
   502
            if (stream != device->fake_stream) {
slouken@2716
   503
                current_audio.impl.PlayDevice(device);
slouken@3096
   504
                /* Wait for an audio buffer to become available */
slouken@3096
   505
                current_audio.impl.WaitDevice(device);
slouken@2716
   506
            } else {
slouken@3336
   507
                SDL_Delay(delay);
slouken@2716
   508
            }
slouken@1895
   509
        }
slouken@1895
   510
    }
slouken@1562
   511
slouken@1895
   512
    /* Wait for the audio to drain.. */
icculus@2049
   513
    current_audio.impl.WaitDone(device);
slouken@21
   514
slouken@2716
   515
    /* If necessary, deinit the streamer */
slouken@2716
   516
    if (device->use_streamer == 1)
slouken@2716
   517
        SDL_StreamDeinit(&device->streamer);
slouken@2716
   518
slouken@1895
   519
    return (0);
slouken@0
   520
}
slouken@0
   521
slouken@322
   522
icculus@1982
   523
static SDL_AudioFormat
slouken@1895
   524
SDL_ParseAudioFormat(const char *string)
slouken@1794
   525
{
icculus@2076
   526
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   527
    CHECK_FMT_STRING(U8);
icculus@2049
   528
    CHECK_FMT_STRING(S8);
icculus@2049
   529
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   530
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   531
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   532
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   533
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   534
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   535
    CHECK_FMT_STRING(U16);
icculus@2049
   536
    CHECK_FMT_STRING(S16);
icculus@2049
   537
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   538
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   539
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   540
    CHECK_FMT_STRING(S32);
icculus@2049
   541
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   542
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   543
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   544
    CHECK_FMT_STRING(F32);
slouken@2060
   545
#undef CHECK_FMT_STRING
icculus@2049
   546
    return 0;
slouken@1895
   547
}
slouken@1895
   548
slouken@1895
   549
int
slouken@1895
   550
SDL_GetNumAudioDrivers(void)
slouken@1895
   551
{
slouken@1895
   552
    return (SDL_arraysize(bootstrap) - 1);
slouken@1895
   553
}
slouken@1895
   554
slouken@1895
   555
const char *
slouken@1895
   556
SDL_GetAudioDriver(int index)
slouken@1895
   557
{
slouken@1895
   558
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
slouken@1895
   559
        return (bootstrap[index]->name);
slouken@1895
   560
    }
slouken@1895
   561
    return (NULL);
slouken@1794
   562
}
slouken@1794
   563
slouken@1895
   564
int
slouken@1895
   565
SDL_AudioInit(const char *driver_name)
slouken@0
   566
{
icculus@2049
   567
    int i = 0;
icculus@2049
   568
    int initialized = 0;
icculus@2049
   569
    int tried_to_init = 0;
slouken@0
   570
icculus@2049
   571
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   572
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   573
    }
slouken@0
   574
slouken@2060
   575
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   576
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   577
slouken@1895
   578
    /* Select the proper audio driver */
slouken@1909
   579
    if (driver_name == NULL) {
slouken@1909
   580
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   581
    }
icculus@2049
   582
icculus@2049
   583
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   584
        /* make sure we should even try this driver before doing so... */
icculus@2049
   585
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   586
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   587
            (!driver_name && backend->demand_only)) {
icculus@2049
   588
            continue;
icculus@2049
   589
        }
slouken@0
   590
icculus@2049
   591
        tried_to_init = 1;
slouken@2060
   592
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   593
        current_audio.name = backend->name;
icculus@2049
   594
        current_audio.desc = backend->desc;
icculus@3699
   595
        initialized = backend->init(&current_audio.impl);
slouken@1895
   596
    }
icculus@2049
   597
icculus@2049
   598
    if (!initialized) {
icculus@2049
   599
        /* specific drivers will set the error message if they fail... */
icculus@2049
   600
        if (!tried_to_init) {
slouken@1895
   601
            if (driver_name) {
icculus@3699
   602
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   603
            } else {
slouken@1895
   604
                SDL_SetError("No available audio device");
slouken@1895
   605
            }
slouken@1895
   606
        }
icculus@2049
   607
slouken@2060
   608
        SDL_memset(&current_audio, 0, sizeof(current_audio));
slouken@2060
   609
        return (-1);            /* No driver was available, so fail. */
slouken@1895
   610
    }
icculus@2049
   611
icculus@2049
   612
    finalize_audio_entry_points();
icculus@2049
   613
slouken@1895
   614
    return (0);
slouken@0
   615
}
slouken@0
   616
slouken@1895
   617
/*
slouken@1895
   618
 * Get the current audio driver name
slouken@1895
   619
 */
slouken@1895
   620
const char *
slouken@1895
   621
SDL_GetCurrentAudioDriver()
slouken@0
   622
{
icculus@2049
   623
    return current_audio.name;
slouken@0
   624
}
slouken@0
   625
icculus@5593
   626
static void
icculus@5593
   627
free_device_list(char ***devices, int *devCount)
icculus@5593
   628
{
icculus@5593
   629
    int i = *devCount;
icculus@5593
   630
    if ((i > 0) && (*devices != NULL)) {
icculus@5593
   631
        while (i--) {
icculus@5593
   632
            SDL_free((*devices)[i]);
icculus@5593
   633
        }
icculus@5593
   634
    }
icculus@5593
   635
icculus@5593
   636
    if (*devices != NULL) {
icculus@5593
   637
        SDL_free(*devices);
icculus@5593
   638
    }
icculus@5593
   639
icculus@5593
   640
    *devices = NULL;
icculus@5593
   641
    *devCount = 0;
icculus@5593
   642
}
icculus@5593
   643
icculus@5593
   644
static
icculus@5593
   645
void SDL_AddCaptureAudioDevice(const char *_name)
icculus@5593
   646
{
icculus@5593
   647
    char *name = NULL;
icculus@5593
   648
    void *ptr = SDL_realloc(current_audio.inputDevices,
icculus@5593
   649
                          (current_audio.inputDeviceCount+1) * sizeof(char*));
icculus@5593
   650
    if (ptr == NULL) {
icculus@5593
   651
        return;  /* oh well. */
icculus@5593
   652
    }
icculus@5593
   653
icculus@5593
   654
    current_audio.inputDevices = (char **) ptr;
icculus@5593
   655
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   656
    current_audio.inputDevices[current_audio.inputDeviceCount++] = name;
icculus@5593
   657
}
icculus@5593
   658
icculus@5593
   659
static
icculus@5593
   660
void SDL_AddOutputAudioDevice(const char *_name)
icculus@5593
   661
{
icculus@5593
   662
    char *name = NULL;
icculus@5593
   663
    void *ptr = SDL_realloc(current_audio.outputDevices,
icculus@5593
   664
                          (current_audio.outputDeviceCount+1) * sizeof(char*));
icculus@5593
   665
    if (ptr == NULL) {
icculus@5593
   666
        return;  /* oh well. */
icculus@5593
   667
    }
icculus@5593
   668
icculus@5593
   669
    current_audio.outputDevices = (char **) ptr;
icculus@5593
   670
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   671
    current_audio.outputDevices[current_audio.outputDeviceCount++] = name;
icculus@5593
   672
}
icculus@5593
   673
icculus@2049
   674
slouken@1895
   675
int
icculus@2049
   676
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   677
{
icculus@5593
   678
    int retval = 0;
icculus@5593
   679
icculus@2049
   680
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   681
        return -1;
icculus@2049
   682
    }
icculus@5593
   683
icculus@2049
   684
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   685
        return 0;
icculus@2049
   686
    }
icculus@2049
   687
icculus@2049
   688
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   689
        return 1;
icculus@2049
   690
    }
icculus@2049
   691
icculus@2049
   692
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   693
        return 1;
icculus@2049
   694
    }
icculus@2049
   695
icculus@5593
   696
    if (iscapture) {
icculus@5593
   697
        free_device_list(&current_audio.inputDevices,
icculus@5593
   698
                         &current_audio.inputDeviceCount);
icculus@5593
   699
        current_audio.impl.DetectDevices(iscapture, SDL_AddCaptureAudioDevice);
icculus@5593
   700
        retval = current_audio.inputDeviceCount;
icculus@5593
   701
    } else {
icculus@5593
   702
        free_device_list(&current_audio.outputDevices,
icculus@5593
   703
                         &current_audio.outputDeviceCount);
icculus@5593
   704
        current_audio.impl.DetectDevices(iscapture, SDL_AddOutputAudioDevice);
icculus@5593
   705
        retval = current_audio.outputDeviceCount;
icculus@5593
   706
    }
icculus@5593
   707
icculus@5593
   708
    return retval;
icculus@2049
   709
}
icculus@2049
   710
slouken@0
   711
icculus@2049
   712
const char *
icculus@2049
   713
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   714
{
icculus@2049
   715
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   716
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   717
        return NULL;
icculus@2049
   718
    }
icculus@2049
   719
icculus@2049
   720
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   721
        SDL_SetError("No capture support");
icculus@2049
   722
        return NULL;
slouken@1895
   723
    }
icculus@2049
   724
icculus@2049
   725
    if (index < 0) {
icculus@5593
   726
        goto no_such_device;
icculus@2049
   727
    }
slouken@0
   728
icculus@2049
   729
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   730
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   731
    }
icculus@2049
   732
icculus@2049
   733
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   734
        return DEFAULT_OUTPUT_DEVNAME;
slouken@1895
   735
    }
slouken@262
   736
icculus@5593
   737
    if (iscapture) {
icculus@5593
   738
        if (index >= current_audio.inputDeviceCount) {
icculus@5593
   739
            goto no_such_device;
icculus@5593
   740
        }
icculus@5593
   741
        return current_audio.inputDevices[index];
icculus@5593
   742
    } else {
icculus@5593
   743
        if (index >= current_audio.outputDeviceCount) {
icculus@5593
   744
            goto no_such_device;
icculus@5593
   745
        }
icculus@5593
   746
        return current_audio.outputDevices[index];
icculus@5593
   747
    }
icculus@5593
   748
icculus@5593
   749
no_such_device:
icculus@5593
   750
    SDL_SetError("No such device");
icculus@5593
   751
    return NULL;
icculus@2049
   752
}
icculus@2049
   753
icculus@2049
   754
icculus@2049
   755
static void
slouken@2060
   756
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   757
{
icculus@2049
   758
    device->enabled = 0;
icculus@2049
   759
    if (device->thread != NULL) {
icculus@2049
   760
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   761
    }
icculus@2049
   762
    if (device->mixer_lock != NULL) {
icculus@2049
   763
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   764
    }
icculus@2049
   765
    if (device->fake_stream != NULL) {
icculus@2049
   766
        SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   767
    }
icculus@2049
   768
    if (device->convert.needed) {
icculus@2049
   769
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   770
    }
icculus@2049
   771
    if (device->opened) {
icculus@2049
   772
        current_audio.impl.CloseDevice(device);
icculus@2049
   773
        device->opened = 0;
icculus@2049
   774
    }
icculus@2049
   775
    SDL_FreeAudioMem(device);
icculus@2049
   776
}
icculus@2049
   777
icculus@2049
   778
icculus@2049
   779
/*
icculus@2049
   780
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   781
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   782
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   783
 */
icculus@2049
   784
static int
slouken@2060
   785
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   786
{
slouken@2060
   787
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   788
icculus@2049
   789
    if (orig->callback == NULL) {
icculus@2049
   790
        SDL_SetError("SDL_OpenAudio() passed a NULL callback");
icculus@2049
   791
        return 0;
icculus@2049
   792
    }
icculus@2049
   793
icculus@2049
   794
    if (orig->freq == 0) {
icculus@2049
   795
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   796
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   797
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   798
        }
slouken@1895
   799
    }
icculus@2049
   800
icculus@2049
   801
    if (orig->format == 0) {
icculus@2049
   802
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   803
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   804
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
   805
        }
slouken@1895
   806
    }
icculus@2049
   807
icculus@2049
   808
    switch (orig->channels) {
slouken@2060
   809
    case 0:{
slouken@2060
   810
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   811
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   812
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   813
            }
slouken@2060
   814
            break;
icculus@2049
   815
        }
slouken@1895
   816
    case 1:                    /* Mono */
slouken@1895
   817
    case 2:                    /* Stereo */
slouken@1895
   818
    case 4:                    /* surround */
slouken@1895
   819
    case 6:                    /* surround with center and lfe */
slouken@1895
   820
        break;
slouken@1895
   821
    default:
icculus@2049
   822
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   823
        return 0;
slouken@1895
   824
    }
icculus@2049
   825
icculus@2049
   826
    if (orig->samples == 0) {
icculus@2049
   827
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   828
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   829
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   830
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   831
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   832
            int power2 = 1;
icculus@2049
   833
            while (power2 < samples) {
icculus@2049
   834
                power2 *= 2;
icculus@2049
   835
            }
icculus@2049
   836
            prepared->samples = power2;
slouken@1895
   837
        }
slouken@1895
   838
    }
slouken@0
   839
slouken@1895
   840
    /* Calculate the silence and size of the audio specification */
icculus@2049
   841
    SDL_CalculateAudioSpec(prepared);
slouken@21
   842
icculus@2049
   843
    return 1;
icculus@2049
   844
}
slouken@1408
   845
slouken@21
   846
icculus@2049
   847
static SDL_AudioDeviceID
icculus@2049
   848
open_audio_device(const char *devname, int iscapture,
slouken@2866
   849
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   850
                  int allowed_changes, int min_id)
icculus@2049
   851
{
icculus@2049
   852
    SDL_AudioDeviceID id = 0;
slouken@2866
   853
    SDL_AudioSpec _obtained;
icculus@2049
   854
    SDL_AudioDevice *device;
slouken@2866
   855
    SDL_bool build_cvt;
icculus@2049
   856
    int i = 0;
slouken@21
   857
icculus@2049
   858
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   859
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   860
        return 0;
icculus@2049
   861
    }
icculus@2049
   862
icculus@2049
   863
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   864
        SDL_SetError("No capture support");
icculus@2049
   865
        return 0;
icculus@2049
   866
    }
icculus@2049
   867
slouken@2866
   868
    if (!obtained) {
slouken@2866
   869
        obtained = &_obtained;
slouken@2866
   870
    }
slouken@2866
   871
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   872
        return 0;
icculus@2049
   873
    }
icculus@2049
   874
icculus@2049
   875
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
   876
    if (devname == NULL) {
icculus@2049
   877
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
   878
    }
slouken@21
   879
icculus@2049
   880
    /*
icculus@2049
   881
     * Catch device names at the high level for the simple case...
icculus@2049
   882
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
   883
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
   884
     *  always NULL when it hits the low level.
icculus@2049
   885
     *
icculus@2049
   886
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
   887
     *  opens of the default system device.
icculus@2049
   888
     */
icculus@2049
   889
icculus@2049
   890
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   891
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
   892
            SDL_SetError("No such device");
icculus@2049
   893
            return 0;
icculus@2049
   894
        }
icculus@2049
   895
        devname = NULL;
icculus@2049
   896
icculus@2049
   897
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   898
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
   899
                SDL_SetError("Audio device already open");
icculus@2049
   900
                return 0;
icculus@2049
   901
            }
icculus@2049
   902
        }
icculus@2049
   903
    }
icculus@2049
   904
icculus@2049
   905
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   906
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
   907
            SDL_SetError("No such device");
icculus@2049
   908
            return 0;
icculus@2049
   909
        }
icculus@2049
   910
        devname = NULL;
icculus@2049
   911
icculus@2049
   912
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   913
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
   914
                SDL_SetError("Audio device already open");
icculus@2049
   915
                return 0;
icculus@2049
   916
            }
icculus@2049
   917
        }
icculus@2049
   918
    }
icculus@2049
   919
slouken@2060
   920
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
   921
    if (device == NULL) {
icculus@2049
   922
        SDL_OutOfMemory();
icculus@2049
   923
        return 0;
icculus@2049
   924
    }
slouken@2060
   925
    SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
slouken@2866
   926
    device->spec = *obtained;
icculus@2049
   927
    device->enabled = 1;
icculus@2049
   928
    device->paused = 1;
icculus@2049
   929
    device->iscapture = iscapture;
icculus@2049
   930
icculus@2049
   931
    /* Create a semaphore for locking the sound buffers */
icculus@2049
   932
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
   933
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
   934
        if (device->mixer_lock == NULL) {
icculus@2049
   935
            close_audio_device(device);
icculus@2049
   936
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
   937
            return 0;
icculus@2049
   938
        }
icculus@2049
   939
    }
icculus@2049
   940
icculus@5593
   941
    /* force a device detection if we haven't done one yet. */
icculus@5593
   942
    if ( ((iscapture) && (current_audio.inputDevices == NULL)) ||
icculus@5593
   943
         ((!iscapture) && (current_audio.outputDevices == NULL)) )
icculus@5593
   944
        SDL_GetNumAudioDevices(iscapture);
icculus@5593
   945
icculus@2049
   946
    if (!current_audio.impl.OpenDevice(device, devname, iscapture)) {
icculus@2049
   947
        close_audio_device(device);
icculus@2049
   948
        return 0;
icculus@2049
   949
    }
icculus@2049
   950
    device->opened = 1;
slouken@0
   951
slouken@1895
   952
    /* Allocate a fake audio memory buffer */
aschiffler@4865
   953
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
   954
    if (device->fake_stream == NULL) {
icculus@2049
   955
        close_audio_device(device);
slouken@1895
   956
        SDL_OutOfMemory();
icculus@2049
   957
        return 0;
slouken@1895
   958
    }
slouken@0
   959
slouken@2866
   960
    /* If the audio driver changes the buffer size, accept it */
slouken@2866
   961
    if (device->spec.samples != obtained->samples) {
slouken@2866
   962
        obtained->samples = device->spec.samples;
slouken@2866
   963
        SDL_CalculateAudioSpec(obtained);
slouken@2866
   964
    }
slouken@2866
   965
slouken@1895
   966
    /* See if we need to do any conversion */
slouken@2866
   967
    build_cvt = SDL_FALSE;
slouken@2866
   968
    if (obtained->freq != device->spec.freq) {
slouken@2866
   969
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
   970
            obtained->freq = device->spec.freq;
slouken@2866
   971
        } else {
slouken@2866
   972
            build_cvt = SDL_TRUE;
slouken@2866
   973
        }
slouken@2866
   974
    }
slouken@2866
   975
    if (obtained->format != device->spec.format) {
slouken@2866
   976
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
   977
            obtained->format = device->spec.format;
slouken@2866
   978
        } else {
slouken@2866
   979
            build_cvt = SDL_TRUE;
slouken@2866
   980
        }
slouken@2866
   981
    }
slouken@2866
   982
    if (obtained->channels != device->spec.channels) {
slouken@2866
   983
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
   984
            obtained->channels = device->spec.channels;
slouken@2866
   985
        } else {
slouken@2866
   986
            build_cvt = SDL_TRUE;
slouken@2866
   987
        }
slouken@2866
   988
    }
slouken@2866
   989
    if (build_cvt) {
slouken@1895
   990
        /* Build an audio conversion block */
icculus@2049
   991
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
   992
                              obtained->format, obtained->channels,
slouken@2866
   993
                              obtained->freq,
icculus@2049
   994
                              device->spec.format, device->spec.channels,
icculus@2049
   995
                              device->spec.freq) < 0) {
icculus@2049
   996
            close_audio_device(device);
icculus@2049
   997
            return 0;
slouken@1895
   998
        }
icculus@2049
   999
        if (device->convert.needed) {
slouken@2866
  1000
            device->convert.len = (int) (((double) obtained->size) /
slouken@2060
  1001
                                         device->convert.len_ratio);
icculus@2053
  1002
icculus@2049
  1003
            device->convert.buf =
icculus@2049
  1004
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1005
                                            device->convert.len_mult);
icculus@2049
  1006
            if (device->convert.buf == NULL) {
icculus@2049
  1007
                close_audio_device(device);
slouken@1895
  1008
                SDL_OutOfMemory();
icculus@2049
  1009
                return 0;
slouken@1895
  1010
            }
slouken@1895
  1011
        }
slouken@1895
  1012
    }
icculus@2049
  1013
icculus@2049
  1014
    /* Find an available device ID and store the structure... */
slouken@2060
  1015
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
  1016
        if (open_devices[id] == NULL) {
icculus@2049
  1017
            open_devices[id] = device;
icculus@2049
  1018
            break;
icculus@2049
  1019
        }
icculus@2049
  1020
    }
icculus@2049
  1021
icculus@2049
  1022
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
  1023
        SDL_SetError("Too many open audio devices");
icculus@2049
  1024
        close_audio_device(device);
icculus@2049
  1025
        return 0;
icculus@2049
  1026
    }
icculus@2049
  1027
slouken@1895
  1028
    /* Start the audio thread if necessary */
icculus@2049
  1029
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1030
        /* Start the audio thread */
icculus@5969
  1031
        char name[64];
icculus@5969
  1032
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) (id + 1));
icculus@2049
  1033
/* !!! FIXME: this is nasty. */
icculus@6430
  1034
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1035
#undef SDL_CreateThread
icculus@5969
  1036
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
slouken@1330
  1037
#else
icculus@5969
  1038
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1039
#endif
icculus@2049
  1040
        if (device->thread == NULL) {
slouken@2060
  1041
            SDL_CloseAudioDevice(id + 1);
slouken@1895
  1042
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1043
            return 0;
icculus@2049
  1044
        }
icculus@2049
  1045
    }
icculus@2049
  1046
slouken@2060
  1047
    return id + 1;
icculus@2049
  1048
}
icculus@2049
  1049
icculus@2049
  1050
icculus@2049
  1051
int
slouken@2866
  1052
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1053
{
icculus@2049
  1054
    SDL_AudioDeviceID id = 0;
icculus@2049
  1055
icculus@2049
  1056
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1057
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1058
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
slouken@1895
  1059
            return (-1);
slouken@1895
  1060
        }
icculus@2049
  1061
    }
slouken@0
  1062
icculus@2049
  1063
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1064
    if (open_devices[0] != NULL) {
icculus@2049
  1065
        SDL_SetError("Audio device is already opened");
icculus@2049
  1066
        return (-1);
slouken@1895
  1067
    }
icculus@2049
  1068
slouken@2866
  1069
    if (obtained) {
slouken@2866
  1070
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1071
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1072
    } else {
slouken@2866
  1073
        id = open_audio_device(NULL, 0, desired, desired, 0, 1);
slouken@2866
  1074
    }
slouken@21
  1075
icculus@5964
  1076
    SDL_assert((id == 0) || (id == 1));
icculus@2049
  1077
    return ((id == 0) ? -1 : 0);
icculus@2049
  1078
}
slouken@21
  1079
icculus@2049
  1080
SDL_AudioDeviceID
icculus@2049
  1081
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1082
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1083
                    int allowed_changes)
icculus@2049
  1084
{
slouken@2866
  1085
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1086
                             allowed_changes, 2);
slouken@1895
  1087
}
slouken@1895
  1088
slouken@3537
  1089
SDL_AudioStatus
icculus@2049
  1090
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1091
{
icculus@2049
  1092
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1093
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1094
    if (device && device->enabled) {
icculus@2049
  1095
        if (device->paused) {
slouken@1895
  1096
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1097
        } else {
slouken@1895
  1098
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1099
        }
slouken@1895
  1100
    }
slouken@1895
  1101
    return (status);
slouken@0
  1102
}
slouken@0
  1103
icculus@2049
  1104
slouken@3537
  1105
SDL_AudioStatus
icculus@2049
  1106
SDL_GetAudioStatus(void)
icculus@2049
  1107
{
icculus@2049
  1108
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1109
}
icculus@2049
  1110
icculus@2049
  1111
void
icculus@2049
  1112
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1113
{
icculus@2049
  1114
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1115
    if (device) {
icculus@2049
  1116
        device->paused = pause_on;
icculus@2049
  1117
    }
icculus@2049
  1118
}
icculus@2049
  1119
slouken@1895
  1120
void
slouken@1895
  1121
SDL_PauseAudio(int pause_on)
slouken@0
  1122
{
icculus@2049
  1123
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1124
}
icculus@2049
  1125
slouken@0
  1126
icculus@2049
  1127
void
icculus@2049
  1128
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1129
{
icculus@2049
  1130
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1131
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1132
    if (device) {
icculus@2049
  1133
        current_audio.impl.LockDevice(device);
slouken@1895
  1134
    }
slouken@0
  1135
}
slouken@0
  1136
slouken@1895
  1137
void
slouken@1895
  1138
SDL_LockAudio(void)
slouken@0
  1139
{
icculus@2049
  1140
    SDL_LockAudioDevice(1);
icculus@2049
  1141
}
slouken@0
  1142
icculus@2049
  1143
void
icculus@2049
  1144
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1145
{
slouken@1895
  1146
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1147
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1148
    if (device) {
icculus@2049
  1149
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1150
    }
slouken@0
  1151
}
slouken@0
  1152
slouken@1895
  1153
void
slouken@1895
  1154
SDL_UnlockAudio(void)
slouken@0
  1155
{
icculus@2049
  1156
    SDL_UnlockAudioDevice(1);
icculus@2049
  1157
}
slouken@0
  1158
icculus@2049
  1159
void
icculus@2049
  1160
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1161
{
icculus@2049
  1162
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1163
    if (device) {
icculus@2049
  1164
        close_audio_device(device);
slouken@2060
  1165
        open_devices[devid - 1] = NULL;
slouken@1895
  1166
    }
slouken@0
  1167
}
slouken@0
  1168
slouken@1895
  1169
void
slouken@1895
  1170
SDL_CloseAudio(void)
slouken@0
  1171
{
icculus@2049
  1172
    SDL_CloseAudioDevice(1);
slouken@0
  1173
}
slouken@0
  1174
slouken@1895
  1175
void
slouken@1895
  1176
SDL_AudioQuit(void)
slouken@0
  1177
{
icculus@2049
  1178
    SDL_AudioDeviceID i;
icculus@2049
  1179
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1180
        SDL_CloseAudioDevice(i);
icculus@2049
  1181
    }
slouken@0
  1182
icculus@2049
  1183
    /* Free the driver data */
icculus@2049
  1184
    current_audio.impl.Deinitialize();
icculus@5593
  1185
    free_device_list(&current_audio.outputDevices,
icculus@5593
  1186
                     &current_audio.outputDeviceCount);
icculus@5593
  1187
    free_device_list(&current_audio.inputDevices,
icculus@5593
  1188
                     &current_audio.inputDeviceCount);
slouken@2060
  1189
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1190
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1191
}
slouken@0
  1192
icculus@1982
  1193
#define NUM_FORMATS 10
slouken@0
  1194
static int format_idx;
slouken@0
  1195
static int format_idx_sub;
icculus@1982
  1196
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1197
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1198
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1199
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1200
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1201
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1202
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1203
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1204
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1205
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1206
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1207
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1208
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1209
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1210
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1211
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1212
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1213
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1214
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1215
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1216
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1217
};
slouken@0
  1218
icculus@1982
  1219
SDL_AudioFormat
icculus@1982
  1220
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1221
{
slouken@1895
  1222
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1223
        if (format_list[format_idx][0] == format) {
slouken@1895
  1224
            break;
slouken@1895
  1225
        }
slouken@1895
  1226
    }
slouken@1895
  1227
    format_idx_sub = 0;
slouken@1895
  1228
    return (SDL_NextAudioFormat());
slouken@0
  1229
}
slouken@0
  1230
icculus@1982
  1231
SDL_AudioFormat
slouken@1895
  1232
SDL_NextAudioFormat(void)
slouken@0
  1233
{
slouken@1895
  1234
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
slouken@1895
  1235
        return (0);
slouken@1895
  1236
    }
slouken@1895
  1237
    return (format_list[format_idx][format_idx_sub++]);
slouken@0
  1238
}
slouken@0
  1239
slouken@1895
  1240
void
slouken@1895
  1241
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1242
{
slouken@1895
  1243
    switch (spec->format) {
slouken@1895
  1244
    case AUDIO_U8:
slouken@1895
  1245
        spec->silence = 0x80;
slouken@1895
  1246
        break;
slouken@1895
  1247
    default:
slouken@1895
  1248
        spec->silence = 0x00;
slouken@1895
  1249
        break;
slouken@1895
  1250
    }
icculus@2049
  1251
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1252
    spec->size *= spec->channels;
slouken@1895
  1253
    spec->size *= spec->samples;
slouken@0
  1254
}
slouken@1895
  1255
icculus@2049
  1256
icculus@2049
  1257
/*
icculus@2049
  1258
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1259
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1260
 */
icculus@2049
  1261
void
icculus@2049
  1262
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1263
{
icculus@2049
  1264
    /* Mix the user-level audio format */
icculus@2049
  1265
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1266
    if (device != NULL) {
icculus@2049
  1267
        SDL_AudioFormat format;
icculus@2049
  1268
        if (device->convert.needed) {
icculus@2049
  1269
            format = device->convert.src_format;
icculus@2049
  1270
        } else {
icculus@2049
  1271
            format = device->spec.format;
icculus@2049
  1272
        }
icculus@2049
  1273
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1274
    }
icculus@2049
  1275
}
icculus@2049
  1276
slouken@1895
  1277
/* vi: set ts=4 sw=4 expandtab: */