src/audio/SDL_audio.c
author Sam Lantinga
Thu, 29 Aug 2013 08:29:21 -0700
changeset 7719 31b5f9ff36ca
parent 7678 286c42d7c5ed
child 7904 915b9b6c9fa0
permissions -rw-r--r--
Christoph Mallon: Remove pointless if (x) before SDL_free(x)
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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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extern AudioBootStrap SNDIO_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SNDIO
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    &SNDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_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_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 -1;
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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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    SDL_free(stream->buffer);
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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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    } 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.
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           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   380
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   381
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   382
         */
slouken@2716
   383
        while (device->enabled) {
slouken@3336
   384
slouken@3336
   385
            if (device->paused) {
slouken@3336
   386
                SDL_Delay(delay);
slouken@3336
   387
                continue;
slouken@3336
   388
            }
slouken@3336
   389
slouken@2716
   390
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   391
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   392
                /* Set up istream */
slouken@2716
   393
                if (device->convert.needed) {
slouken@2716
   394
                    if (device->convert.buf) {
slouken@2716
   395
                        istream = device->convert.buf;
slouken@2716
   396
                    } else {
slouken@2716
   397
                        continue;
slouken@2716
   398
                    }
slouken@2716
   399
                } else {
slouken@3336
   400
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   401
 * a device buffer both here and below in the stream output.
slouken@3336
   402
 */
slouken@2716
   403
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   404
                    if (istream == NULL) {
slouken@2716
   405
                        istream = device->fake_stream;
slouken@2716
   406
                    }
slouken@2716
   407
                }
slouken@0
   408
slouken@2716
   409
                /* Read from the callback into the _input_ stream */
slouken@6977
   410
                SDL_LockMutex(device->mixer_lock);
slouken@3336
   411
                (*fill) (udata, istream, istream_len);
slouken@6977
   412
                SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   413
slouken@2716
   414
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   415
                if (device->convert.needed) {
slouken@2716
   416
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   417
                    if (istream == NULL) {
slouken@2716
   418
                        istream = device->fake_stream;
slouken@2716
   419
                    }
gabomdq@7678
   420
                    /* SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   421
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   422
                                    device->convert.len_cvt);
slouken@2716
   423
                } else {
slouken@2716
   424
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   425
                }
slouken@1895
   426
            }
slouken@2716
   427
slouken@2716
   428
            /* Only output audio if the streamer has enough to output */
slouken@2716
   429
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   430
                /* Set up the output stream */
slouken@2716
   431
                if (device->convert.needed) {
slouken@2716
   432
                    if (device->convert.buf) {
slouken@2716
   433
                        stream = device->convert.buf;
slouken@2716
   434
                    } else {
slouken@2716
   435
                        continue;
slouken@2716
   436
                    }
slouken@2716
   437
                } else {
slouken@2716
   438
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   439
                    if (stream == NULL) {
slouken@2716
   440
                        stream = device->fake_stream;
slouken@2716
   441
                    }
slouken@2716
   442
                }
slouken@2716
   443
slouken@2716
   444
                /* Now read from the streamer */
slouken@2716
   445
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   446
slouken@2716
   447
                /* Ready current buffer for play and change current buffer */
slouken@3336
   448
                if (stream != device->fake_stream) {
slouken@2716
   449
                    current_audio.impl.PlayDevice(device);
slouken@3096
   450
                    /* Wait for an audio buffer to become available */
slouken@3096
   451
                    current_audio.impl.WaitDevice(device);
slouken@2716
   452
                } else {
slouken@3336
   453
                    SDL_Delay(delay);
slouken@2716
   454
                }
slouken@1895
   455
            }
slouken@0
   456
slouken@1895
   457
        }
slouken@2716
   458
    } else {
slouken@2716
   459
        /* Otherwise, do not use the streamer. This is the old code. */
icculus@7406
   460
        const int silence = (int) device->spec.silence;
slouken@0
   461
slouken@2716
   462
        /* Loop, filling the audio buffers */
slouken@2716
   463
        while (device->enabled) {
slouken@2716
   464
slouken@2716
   465
            /* Fill the current buffer with sound */
slouken@2716
   466
            if (device->convert.needed) {
slouken@2716
   467
                if (device->convert.buf) {
slouken@2716
   468
                    stream = device->convert.buf;
slouken@2716
   469
                } else {
slouken@2716
   470
                    continue;
slouken@2716
   471
                }
slouken@2716
   472
            } else {
slouken@2716
   473
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   474
                if (stream == NULL) {
slouken@2716
   475
                    stream = device->fake_stream;
slouken@2716
   476
                }
slouken@1895
   477
            }
slouken@0
   478
icculus@7447
   479
            SDL_LockMutex(device->mixer_lock);
icculus@7406
   480
            if (device->paused) {
icculus@7406
   481
                SDL_memset(stream, silence, stream_len);
icculus@7406
   482
            } else {
icculus@7406
   483
                (*fill) (udata, stream, stream_len);
icculus@7406
   484
            }
icculus@7447
   485
            SDL_UnlockMutex(device->mixer_lock);
slouken@1562
   486
slouken@2716
   487
            /* Convert the audio if necessary */
slouken@2716
   488
            if (device->convert.needed) {
slouken@2716
   489
                SDL_ConvertAudio(&device->convert);
slouken@2716
   490
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   491
                if (stream == NULL) {
slouken@2716
   492
                    stream = device->fake_stream;
slouken@2716
   493
                }
slouken@2716
   494
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   495
                           device->convert.len_cvt);
slouken@2716
   496
            }
slouken@2716
   497
slouken@2716
   498
            /* Ready current buffer for play and change current buffer */
slouken@3336
   499
            if (stream != device->fake_stream) {
slouken@2716
   500
                current_audio.impl.PlayDevice(device);
slouken@3096
   501
                /* Wait for an audio buffer to become available */
slouken@3096
   502
                current_audio.impl.WaitDevice(device);
slouken@2716
   503
            } else {
slouken@3336
   504
                SDL_Delay(delay);
slouken@2716
   505
            }
slouken@1895
   506
        }
slouken@1895
   507
    }
slouken@1562
   508
slouken@1895
   509
    /* Wait for the audio to drain.. */
icculus@2049
   510
    current_audio.impl.WaitDone(device);
slouken@21
   511
slouken@2716
   512
    /* If necessary, deinit the streamer */
slouken@2716
   513
    if (device->use_streamer == 1)
slouken@2716
   514
        SDL_StreamDeinit(&device->streamer);
slouken@2716
   515
slouken@1895
   516
    return (0);
slouken@0
   517
}
slouken@0
   518
slouken@322
   519
icculus@1982
   520
static SDL_AudioFormat
slouken@1895
   521
SDL_ParseAudioFormat(const char *string)
slouken@1794
   522
{
icculus@2076
   523
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   524
    CHECK_FMT_STRING(U8);
icculus@2049
   525
    CHECK_FMT_STRING(S8);
icculus@2049
   526
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   527
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   528
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   529
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   530
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   531
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   532
    CHECK_FMT_STRING(U16);
icculus@2049
   533
    CHECK_FMT_STRING(S16);
icculus@2049
   534
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   535
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   536
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   537
    CHECK_FMT_STRING(S32);
icculus@2049
   538
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   539
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   540
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   541
    CHECK_FMT_STRING(F32);
slouken@2060
   542
#undef CHECK_FMT_STRING
icculus@2049
   543
    return 0;
slouken@1895
   544
}
slouken@1895
   545
slouken@1895
   546
int
slouken@1895
   547
SDL_GetNumAudioDrivers(void)
slouken@1895
   548
{
slouken@1895
   549
    return (SDL_arraysize(bootstrap) - 1);
slouken@1895
   550
}
slouken@1895
   551
slouken@1895
   552
const char *
slouken@1895
   553
SDL_GetAudioDriver(int index)
slouken@1895
   554
{
slouken@1895
   555
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
slouken@1895
   556
        return (bootstrap[index]->name);
slouken@1895
   557
    }
slouken@1895
   558
    return (NULL);
slouken@1794
   559
}
slouken@1794
   560
slouken@1895
   561
int
slouken@1895
   562
SDL_AudioInit(const char *driver_name)
slouken@0
   563
{
icculus@2049
   564
    int i = 0;
icculus@2049
   565
    int initialized = 0;
icculus@2049
   566
    int tried_to_init = 0;
slouken@0
   567
icculus@2049
   568
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   569
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   570
    }
slouken@0
   571
slouken@2060
   572
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   573
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   574
slouken@1895
   575
    /* Select the proper audio driver */
slouken@1909
   576
    if (driver_name == NULL) {
slouken@1909
   577
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   578
    }
icculus@2049
   579
icculus@2049
   580
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   581
        /* make sure we should even try this driver before doing so... */
icculus@2049
   582
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   583
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   584
            (!driver_name && backend->demand_only)) {
icculus@2049
   585
            continue;
icculus@2049
   586
        }
slouken@0
   587
icculus@2049
   588
        tried_to_init = 1;
slouken@2060
   589
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   590
        current_audio.name = backend->name;
icculus@2049
   591
        current_audio.desc = backend->desc;
icculus@3699
   592
        initialized = backend->init(&current_audio.impl);
slouken@1895
   593
    }
icculus@2049
   594
icculus@2049
   595
    if (!initialized) {
icculus@2049
   596
        /* specific drivers will set the error message if they fail... */
icculus@2049
   597
        if (!tried_to_init) {
slouken@1895
   598
            if (driver_name) {
icculus@3699
   599
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   600
            } else {
slouken@1895
   601
                SDL_SetError("No available audio device");
slouken@1895
   602
            }
slouken@1895
   603
        }
icculus@2049
   604
slouken@2060
   605
        SDL_memset(&current_audio, 0, sizeof(current_audio));
slouken@2060
   606
        return (-1);            /* No driver was available, so fail. */
slouken@1895
   607
    }
icculus@2049
   608
icculus@2049
   609
    finalize_audio_entry_points();
icculus@2049
   610
slouken@1895
   611
    return (0);
slouken@0
   612
}
slouken@0
   613
slouken@1895
   614
/*
slouken@1895
   615
 * Get the current audio driver name
slouken@1895
   616
 */
slouken@1895
   617
const char *
slouken@1895
   618
SDL_GetCurrentAudioDriver()
slouken@0
   619
{
icculus@2049
   620
    return current_audio.name;
slouken@0
   621
}
slouken@0
   622
icculus@5593
   623
static void
icculus@5593
   624
free_device_list(char ***devices, int *devCount)
icculus@5593
   625
{
icculus@5593
   626
    int i = *devCount;
icculus@5593
   627
    if ((i > 0) && (*devices != NULL)) {
icculus@5593
   628
        while (i--) {
icculus@5593
   629
            SDL_free((*devices)[i]);
icculus@5593
   630
        }
icculus@5593
   631
    }
icculus@5593
   632
slouken@7719
   633
    SDL_free(*devices);
icculus@5593
   634
icculus@5593
   635
    *devices = NULL;
icculus@5593
   636
    *devCount = 0;
icculus@5593
   637
}
icculus@5593
   638
icculus@5593
   639
static
icculus@5593
   640
void SDL_AddCaptureAudioDevice(const char *_name)
icculus@5593
   641
{
icculus@5593
   642
    char *name = NULL;
icculus@5593
   643
    void *ptr = SDL_realloc(current_audio.inputDevices,
icculus@5593
   644
                          (current_audio.inputDeviceCount+1) * sizeof(char*));
icculus@5593
   645
    if (ptr == NULL) {
icculus@5593
   646
        return;  /* oh well. */
icculus@5593
   647
    }
icculus@5593
   648
icculus@5593
   649
    current_audio.inputDevices = (char **) ptr;
icculus@5593
   650
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   651
    current_audio.inputDevices[current_audio.inputDeviceCount++] = name;
icculus@5593
   652
}
icculus@5593
   653
icculus@5593
   654
static
icculus@5593
   655
void SDL_AddOutputAudioDevice(const char *_name)
icculus@5593
   656
{
icculus@5593
   657
    char *name = NULL;
icculus@5593
   658
    void *ptr = SDL_realloc(current_audio.outputDevices,
icculus@5593
   659
                          (current_audio.outputDeviceCount+1) * sizeof(char*));
icculus@5593
   660
    if (ptr == NULL) {
icculus@5593
   661
        return;  /* oh well. */
icculus@5593
   662
    }
icculus@5593
   663
icculus@5593
   664
    current_audio.outputDevices = (char **) ptr;
icculus@5593
   665
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   666
    current_audio.outputDevices[current_audio.outputDeviceCount++] = name;
icculus@5593
   667
}
icculus@5593
   668
icculus@2049
   669
slouken@1895
   670
int
icculus@2049
   671
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   672
{
icculus@5593
   673
    int retval = 0;
icculus@5593
   674
icculus@2049
   675
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   676
        return -1;
icculus@2049
   677
    }
icculus@5593
   678
icculus@2049
   679
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   680
        return 0;
icculus@2049
   681
    }
icculus@2049
   682
icculus@2049
   683
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   684
        return 1;
icculus@2049
   685
    }
icculus@2049
   686
icculus@2049
   687
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   688
        return 1;
icculus@2049
   689
    }
icculus@2049
   690
icculus@5593
   691
    if (iscapture) {
icculus@5593
   692
        free_device_list(&current_audio.inputDevices,
icculus@5593
   693
                         &current_audio.inputDeviceCount);
icculus@5593
   694
        current_audio.impl.DetectDevices(iscapture, SDL_AddCaptureAudioDevice);
icculus@5593
   695
        retval = current_audio.inputDeviceCount;
icculus@5593
   696
    } else {
icculus@5593
   697
        free_device_list(&current_audio.outputDevices,
icculus@5593
   698
                         &current_audio.outputDeviceCount);
icculus@5593
   699
        current_audio.impl.DetectDevices(iscapture, SDL_AddOutputAudioDevice);
icculus@5593
   700
        retval = current_audio.outputDeviceCount;
icculus@5593
   701
    }
icculus@5593
   702
icculus@5593
   703
    return retval;
icculus@2049
   704
}
icculus@2049
   705
slouken@0
   706
icculus@2049
   707
const char *
icculus@2049
   708
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   709
{
icculus@2049
   710
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   711
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   712
        return NULL;
icculus@2049
   713
    }
icculus@2049
   714
icculus@2049
   715
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   716
        SDL_SetError("No capture support");
icculus@2049
   717
        return NULL;
slouken@1895
   718
    }
icculus@2049
   719
icculus@2049
   720
    if (index < 0) {
icculus@5593
   721
        goto no_such_device;
icculus@2049
   722
    }
slouken@0
   723
icculus@2049
   724
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   725
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   726
    }
icculus@2049
   727
icculus@2049
   728
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   729
        return DEFAULT_OUTPUT_DEVNAME;
slouken@1895
   730
    }
slouken@262
   731
icculus@5593
   732
    if (iscapture) {
icculus@5593
   733
        if (index >= current_audio.inputDeviceCount) {
icculus@5593
   734
            goto no_such_device;
icculus@5593
   735
        }
icculus@5593
   736
        return current_audio.inputDevices[index];
icculus@5593
   737
    } else {
icculus@5593
   738
        if (index >= current_audio.outputDeviceCount) {
icculus@5593
   739
            goto no_such_device;
icculus@5593
   740
        }
icculus@5593
   741
        return current_audio.outputDevices[index];
icculus@5593
   742
    }
icculus@5593
   743
icculus@5593
   744
no_such_device:
icculus@5593
   745
    SDL_SetError("No such device");
icculus@5593
   746
    return NULL;
icculus@2049
   747
}
icculus@2049
   748
icculus@2049
   749
icculus@2049
   750
static void
slouken@2060
   751
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   752
{
icculus@2049
   753
    device->enabled = 0;
icculus@2049
   754
    if (device->thread != NULL) {
icculus@2049
   755
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   756
    }
icculus@2049
   757
    if (device->mixer_lock != NULL) {
icculus@2049
   758
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   759
    }
slouken@7719
   760
    SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   761
    if (device->convert.needed) {
icculus@2049
   762
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   763
    }
icculus@2049
   764
    if (device->opened) {
icculus@2049
   765
        current_audio.impl.CloseDevice(device);
icculus@2049
   766
        device->opened = 0;
icculus@2049
   767
    }
icculus@2049
   768
    SDL_FreeAudioMem(device);
icculus@2049
   769
}
icculus@2049
   770
icculus@2049
   771
icculus@2049
   772
/*
icculus@2049
   773
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   774
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   775
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   776
 */
icculus@2049
   777
static int
slouken@2060
   778
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   779
{
slouken@2060
   780
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   781
icculus@2049
   782
    if (orig->callback == NULL) {
icculus@2049
   783
        SDL_SetError("SDL_OpenAudio() passed a NULL callback");
icculus@2049
   784
        return 0;
icculus@2049
   785
    }
icculus@2049
   786
icculus@2049
   787
    if (orig->freq == 0) {
icculus@2049
   788
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   789
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   790
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   791
        }
slouken@1895
   792
    }
icculus@2049
   793
icculus@2049
   794
    if (orig->format == 0) {
icculus@2049
   795
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   796
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   797
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
   798
        }
slouken@1895
   799
    }
icculus@2049
   800
icculus@2049
   801
    switch (orig->channels) {
slouken@2060
   802
    case 0:{
slouken@2060
   803
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   804
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   805
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   806
            }
slouken@2060
   807
            break;
icculus@2049
   808
        }
slouken@1895
   809
    case 1:                    /* Mono */
slouken@1895
   810
    case 2:                    /* Stereo */
slouken@1895
   811
    case 4:                    /* surround */
slouken@1895
   812
    case 6:                    /* surround with center and lfe */
slouken@1895
   813
        break;
slouken@1895
   814
    default:
icculus@2049
   815
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   816
        return 0;
slouken@1895
   817
    }
icculus@2049
   818
icculus@2049
   819
    if (orig->samples == 0) {
icculus@2049
   820
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   821
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   822
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   823
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   824
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   825
            int power2 = 1;
icculus@2049
   826
            while (power2 < samples) {
icculus@2049
   827
                power2 *= 2;
icculus@2049
   828
            }
icculus@2049
   829
            prepared->samples = power2;
slouken@1895
   830
        }
slouken@1895
   831
    }
slouken@0
   832
slouken@1895
   833
    /* Calculate the silence and size of the audio specification */
icculus@2049
   834
    SDL_CalculateAudioSpec(prepared);
slouken@21
   835
icculus@2049
   836
    return 1;
icculus@2049
   837
}
slouken@1408
   838
slouken@21
   839
icculus@2049
   840
static SDL_AudioDeviceID
icculus@2049
   841
open_audio_device(const char *devname, int iscapture,
slouken@2866
   842
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   843
                  int allowed_changes, int min_id)
icculus@2049
   844
{
icculus@2049
   845
    SDL_AudioDeviceID id = 0;
slouken@2866
   846
    SDL_AudioSpec _obtained;
icculus@2049
   847
    SDL_AudioDevice *device;
slouken@2866
   848
    SDL_bool build_cvt;
icculus@2049
   849
    int i = 0;
slouken@21
   850
icculus@2049
   851
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   852
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   853
        return 0;
icculus@2049
   854
    }
icculus@2049
   855
icculus@2049
   856
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   857
        SDL_SetError("No capture support");
icculus@2049
   858
        return 0;
icculus@2049
   859
    }
icculus@2049
   860
slouken@2866
   861
    if (!obtained) {
slouken@2866
   862
        obtained = &_obtained;
slouken@2866
   863
    }
slouken@2866
   864
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   865
        return 0;
icculus@2049
   866
    }
icculus@2049
   867
icculus@2049
   868
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
   869
    if (devname == NULL) {
icculus@2049
   870
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
   871
    }
slouken@21
   872
icculus@2049
   873
    /*
icculus@2049
   874
     * Catch device names at the high level for the simple case...
icculus@2049
   875
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
   876
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
   877
     *  always NULL when it hits the low level.
icculus@2049
   878
     *
icculus@2049
   879
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
   880
     *  opens of the default system device.
icculus@2049
   881
     */
icculus@2049
   882
icculus@2049
   883
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   884
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
   885
            SDL_SetError("No such device");
icculus@2049
   886
            return 0;
icculus@2049
   887
        }
icculus@2049
   888
        devname = NULL;
icculus@2049
   889
icculus@2049
   890
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   891
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
   892
                SDL_SetError("Audio device already open");
icculus@2049
   893
                return 0;
icculus@2049
   894
            }
icculus@2049
   895
        }
icculus@2049
   896
    }
icculus@2049
   897
icculus@2049
   898
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   899
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
   900
            SDL_SetError("No such device");
icculus@2049
   901
            return 0;
icculus@2049
   902
        }
icculus@2049
   903
        devname = NULL;
icculus@2049
   904
icculus@2049
   905
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   906
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
   907
                SDL_SetError("Audio device already open");
icculus@2049
   908
                return 0;
icculus@2049
   909
            }
icculus@2049
   910
        }
icculus@2049
   911
    }
icculus@2049
   912
slouken@2060
   913
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
   914
    if (device == NULL) {
icculus@2049
   915
        SDL_OutOfMemory();
icculus@2049
   916
        return 0;
icculus@2049
   917
    }
slouken@2060
   918
    SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
slouken@2866
   919
    device->spec = *obtained;
icculus@2049
   920
    device->enabled = 1;
icculus@2049
   921
    device->paused = 1;
icculus@2049
   922
    device->iscapture = iscapture;
icculus@2049
   923
icculus@2049
   924
    /* Create a semaphore for locking the sound buffers */
icculus@2049
   925
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
   926
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
   927
        if (device->mixer_lock == NULL) {
icculus@2049
   928
            close_audio_device(device);
icculus@2049
   929
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
   930
            return 0;
icculus@2049
   931
        }
icculus@2049
   932
    }
icculus@2049
   933
icculus@5593
   934
    /* force a device detection if we haven't done one yet. */
icculus@5593
   935
    if ( ((iscapture) && (current_audio.inputDevices == NULL)) ||
icculus@5593
   936
         ((!iscapture) && (current_audio.outputDevices == NULL)) )
icculus@5593
   937
        SDL_GetNumAudioDevices(iscapture);
icculus@5593
   938
icculus@7038
   939
    if (current_audio.impl.OpenDevice(device, devname, iscapture) < 0) {
icculus@2049
   940
        close_audio_device(device);
icculus@2049
   941
        return 0;
icculus@2049
   942
    }
icculus@2049
   943
    device->opened = 1;
slouken@0
   944
slouken@1895
   945
    /* Allocate a fake audio memory buffer */
aschiffler@4865
   946
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
   947
    if (device->fake_stream == NULL) {
icculus@2049
   948
        close_audio_device(device);
slouken@1895
   949
        SDL_OutOfMemory();
icculus@2049
   950
        return 0;
slouken@1895
   951
    }
slouken@0
   952
slouken@1895
   953
    /* See if we need to do any conversion */
slouken@2866
   954
    build_cvt = SDL_FALSE;
slouken@2866
   955
    if (obtained->freq != device->spec.freq) {
slouken@2866
   956
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
   957
            obtained->freq = device->spec.freq;
slouken@2866
   958
        } else {
slouken@2866
   959
            build_cvt = SDL_TRUE;
slouken@2866
   960
        }
slouken@2866
   961
    }
slouken@2866
   962
    if (obtained->format != device->spec.format) {
slouken@2866
   963
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
   964
            obtained->format = device->spec.format;
slouken@2866
   965
        } else {
slouken@2866
   966
            build_cvt = SDL_TRUE;
slouken@2866
   967
        }
slouken@2866
   968
    }
slouken@2866
   969
    if (obtained->channels != device->spec.channels) {
slouken@2866
   970
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
   971
            obtained->channels = device->spec.channels;
slouken@2866
   972
        } else {
slouken@2866
   973
            build_cvt = SDL_TRUE;
slouken@2866
   974
        }
slouken@2866
   975
    }
slouken@7518
   976
slouken@7518
   977
    /* If the audio driver changes the buffer size, accept it.
slouken@7518
   978
       This needs to be done after the format is modified above,
slouken@7518
   979
       otherwise it might not have the correct buffer size.
slouken@7518
   980
     */
slouken@7518
   981
    if (device->spec.samples != obtained->samples) {
slouken@7518
   982
        obtained->samples = device->spec.samples;
slouken@7518
   983
        SDL_CalculateAudioSpec(obtained);
slouken@7518
   984
    }
slouken@7518
   985
slouken@2866
   986
    if (build_cvt) {
slouken@1895
   987
        /* Build an audio conversion block */
icculus@2049
   988
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
   989
                              obtained->format, obtained->channels,
slouken@2866
   990
                              obtained->freq,
icculus@2049
   991
                              device->spec.format, device->spec.channels,
icculus@2049
   992
                              device->spec.freq) < 0) {
icculus@2049
   993
            close_audio_device(device);
icculus@2049
   994
            return 0;
slouken@1895
   995
        }
icculus@2049
   996
        if (device->convert.needed) {
slouken@7518
   997
            device->convert.len = (int) (((double) device->spec.size) /
slouken@2060
   998
                                         device->convert.len_ratio);
icculus@2053
   999
icculus@2049
  1000
            device->convert.buf =
icculus@2049
  1001
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1002
                                            device->convert.len_mult);
icculus@2049
  1003
            if (device->convert.buf == NULL) {
icculus@2049
  1004
                close_audio_device(device);
slouken@1895
  1005
                SDL_OutOfMemory();
icculus@2049
  1006
                return 0;
slouken@1895
  1007
            }
slouken@1895
  1008
        }
slouken@1895
  1009
    }
icculus@2049
  1010
icculus@2049
  1011
    /* Find an available device ID and store the structure... */
slouken@2060
  1012
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
  1013
        if (open_devices[id] == NULL) {
icculus@2049
  1014
            open_devices[id] = device;
icculus@2049
  1015
            break;
icculus@2049
  1016
        }
icculus@2049
  1017
    }
icculus@2049
  1018
icculus@2049
  1019
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
  1020
        SDL_SetError("Too many open audio devices");
icculus@2049
  1021
        close_audio_device(device);
icculus@2049
  1022
        return 0;
icculus@2049
  1023
    }
icculus@2049
  1024
slouken@1895
  1025
    /* Start the audio thread if necessary */
icculus@2049
  1026
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1027
        /* Start the audio thread */
icculus@5969
  1028
        char name[64];
icculus@5969
  1029
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) (id + 1));
icculus@2049
  1030
/* !!! FIXME: this is nasty. */
icculus@6430
  1031
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1032
#undef SDL_CreateThread
icculus@5969
  1033
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
slouken@1330
  1034
#else
icculus@5969
  1035
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1036
#endif
icculus@2049
  1037
        if (device->thread == NULL) {
slouken@2060
  1038
            SDL_CloseAudioDevice(id + 1);
slouken@1895
  1039
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1040
            return 0;
icculus@2049
  1041
        }
icculus@2049
  1042
    }
icculus@2049
  1043
slouken@2060
  1044
    return id + 1;
icculus@2049
  1045
}
icculus@2049
  1046
icculus@2049
  1047
icculus@2049
  1048
int
slouken@2866
  1049
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1050
{
icculus@2049
  1051
    SDL_AudioDeviceID id = 0;
icculus@2049
  1052
icculus@2049
  1053
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1054
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1055
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
slouken@1895
  1056
            return (-1);
slouken@1895
  1057
        }
icculus@2049
  1058
    }
slouken@0
  1059
icculus@2049
  1060
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1061
    if (open_devices[0] != NULL) {
icculus@2049
  1062
        SDL_SetError("Audio device is already opened");
icculus@2049
  1063
        return (-1);
slouken@1895
  1064
    }
icculus@2049
  1065
slouken@2866
  1066
    if (obtained) {
slouken@2866
  1067
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1068
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1069
    } else {
slouken@2866
  1070
        id = open_audio_device(NULL, 0, desired, desired, 0, 1);
slouken@2866
  1071
    }
slouken@21
  1072
icculus@5964
  1073
    SDL_assert((id == 0) || (id == 1));
icculus@2049
  1074
    return ((id == 0) ? -1 : 0);
icculus@2049
  1075
}
slouken@21
  1076
icculus@2049
  1077
SDL_AudioDeviceID
icculus@2049
  1078
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1079
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1080
                    int allowed_changes)
icculus@2049
  1081
{
slouken@2866
  1082
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1083
                             allowed_changes, 2);
slouken@1895
  1084
}
slouken@1895
  1085
slouken@3537
  1086
SDL_AudioStatus
icculus@2049
  1087
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1088
{
icculus@2049
  1089
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1090
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1091
    if (device && device->enabled) {
icculus@2049
  1092
        if (device->paused) {
slouken@1895
  1093
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1094
        } else {
slouken@1895
  1095
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1096
        }
slouken@1895
  1097
    }
slouken@1895
  1098
    return (status);
slouken@0
  1099
}
slouken@0
  1100
icculus@2049
  1101
slouken@3537
  1102
SDL_AudioStatus
icculus@2049
  1103
SDL_GetAudioStatus(void)
icculus@2049
  1104
{
icculus@2049
  1105
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1106
}
icculus@2049
  1107
icculus@2049
  1108
void
icculus@2049
  1109
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1110
{
icculus@2049
  1111
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1112
    if (device) {
icculus@7447
  1113
        current_audio.impl.LockDevice(device);
icculus@2049
  1114
        device->paused = pause_on;
icculus@7447
  1115
        current_audio.impl.UnlockDevice(device);
icculus@2049
  1116
    }
icculus@2049
  1117
}
icculus@2049
  1118
slouken@1895
  1119
void
slouken@1895
  1120
SDL_PauseAudio(int pause_on)
slouken@0
  1121
{
icculus@2049
  1122
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1123
}
icculus@2049
  1124
slouken@0
  1125
icculus@2049
  1126
void
icculus@2049
  1127
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1128
{
icculus@2049
  1129
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1130
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1131
    if (device) {
icculus@2049
  1132
        current_audio.impl.LockDevice(device);
slouken@1895
  1133
    }
slouken@0
  1134
}
slouken@0
  1135
slouken@1895
  1136
void
slouken@1895
  1137
SDL_LockAudio(void)
slouken@0
  1138
{
icculus@2049
  1139
    SDL_LockAudioDevice(1);
icculus@2049
  1140
}
slouken@0
  1141
icculus@2049
  1142
void
icculus@2049
  1143
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1144
{
slouken@1895
  1145
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1146
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1147
    if (device) {
icculus@2049
  1148
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1149
    }
slouken@0
  1150
}
slouken@0
  1151
slouken@1895
  1152
void
slouken@1895
  1153
SDL_UnlockAudio(void)
slouken@0
  1154
{
icculus@2049
  1155
    SDL_UnlockAudioDevice(1);
icculus@2049
  1156
}
slouken@0
  1157
icculus@2049
  1158
void
icculus@2049
  1159
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1160
{
icculus@2049
  1161
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1162
    if (device) {
icculus@2049
  1163
        close_audio_device(device);
slouken@2060
  1164
        open_devices[devid - 1] = NULL;
slouken@1895
  1165
    }
slouken@0
  1166
}
slouken@0
  1167
slouken@1895
  1168
void
slouken@1895
  1169
SDL_CloseAudio(void)
slouken@0
  1170
{
icculus@2049
  1171
    SDL_CloseAudioDevice(1);
slouken@0
  1172
}
slouken@0
  1173
slouken@1895
  1174
void
slouken@1895
  1175
SDL_AudioQuit(void)
slouken@0
  1176
{
icculus@7348
  1177
    SDL_AudioDeviceID i;
icculus@7348
  1178
icculus@7345
  1179
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1180
        return;
icculus@7345
  1181
    }
icculus@7345
  1182
icculus@2049
  1183
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1184
        if (open_devices[i] != NULL) {
icculus@7446
  1185
            SDL_CloseAudioDevice(i+1);
icculus@7342
  1186
        }
icculus@2049
  1187
    }
slouken@0
  1188
icculus@2049
  1189
    /* Free the driver data */
icculus@2049
  1190
    current_audio.impl.Deinitialize();
icculus@5593
  1191
    free_device_list(&current_audio.outputDevices,
icculus@5593
  1192
                     &current_audio.outputDeviceCount);
icculus@5593
  1193
    free_device_list(&current_audio.inputDevices,
icculus@5593
  1194
                     &current_audio.inputDeviceCount);
slouken@2060
  1195
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1196
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1197
}
slouken@0
  1198
icculus@1982
  1199
#define NUM_FORMATS 10
slouken@0
  1200
static int format_idx;
slouken@0
  1201
static int format_idx_sub;
icculus@1982
  1202
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1203
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1204
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1205
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1206
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1207
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1208
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1209
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1210
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1211
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1212
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1213
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1214
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1215
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1216
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1217
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1218
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1219
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1220
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1221
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1222
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1223
};
slouken@0
  1224
icculus@1982
  1225
SDL_AudioFormat
icculus@1982
  1226
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1227
{
slouken@1895
  1228
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1229
        if (format_list[format_idx][0] == format) {
slouken@1895
  1230
            break;
slouken@1895
  1231
        }
slouken@1895
  1232
    }
slouken@1895
  1233
    format_idx_sub = 0;
slouken@1895
  1234
    return (SDL_NextAudioFormat());
slouken@0
  1235
}
slouken@0
  1236
icculus@1982
  1237
SDL_AudioFormat
slouken@1895
  1238
SDL_NextAudioFormat(void)
slouken@0
  1239
{
slouken@1895
  1240
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
slouken@1895
  1241
        return (0);
slouken@1895
  1242
    }
slouken@1895
  1243
    return (format_list[format_idx][format_idx_sub++]);
slouken@0
  1244
}
slouken@0
  1245
slouken@1895
  1246
void
slouken@1895
  1247
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1248
{
slouken@1895
  1249
    switch (spec->format) {
slouken@1895
  1250
    case AUDIO_U8:
slouken@1895
  1251
        spec->silence = 0x80;
slouken@1895
  1252
        break;
slouken@1895
  1253
    default:
slouken@1895
  1254
        spec->silence = 0x00;
slouken@1895
  1255
        break;
slouken@1895
  1256
    }
icculus@2049
  1257
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1258
    spec->size *= spec->channels;
slouken@1895
  1259
    spec->size *= spec->samples;
slouken@0
  1260
}
slouken@1895
  1261
icculus@2049
  1262
icculus@2049
  1263
/*
icculus@2049
  1264
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1265
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1266
 */
icculus@2049
  1267
void
icculus@2049
  1268
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1269
{
icculus@2049
  1270
    /* Mix the user-level audio format */
icculus@2049
  1271
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1272
    if (device != NULL) {
icculus@2049
  1273
        SDL_AudioFormat format;
icculus@2049
  1274
        if (device->convert.needed) {
icculus@2049
  1275
            format = device->convert.src_format;
icculus@2049
  1276
        } else {
icculus@2049
  1277
            format = device->spec.format;
icculus@2049
  1278
        }
icculus@2049
  1279
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1280
    }
icculus@2049
  1281
}
icculus@2049
  1282
slouken@1895
  1283
/* vi: set ts=4 sw=4 expandtab: */