src/audio/SDL_audio.c
author Ryan C. Gordon
Fri, 13 Mar 2015 12:20:17 -0400
changeset 9382 1c0f6952e65e
parent 9381 812b2dabf8a4
child 9391 3a54985e999e
permissions -rw-r--r--
Cleaning out a silly coding style I used to use.

Changed all the "return (x);" lines to "return x;"
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* Allow access to a raw mixing buffer */
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#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#include "SDL_audiomem.h"
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#include "SDL_sysaudio.h"
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#define _THIS SDL_AudioDevice *_this
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static SDL_AudioDriver current_audio;
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static SDL_AudioDevice *open_devices[16];
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/* !!! FIXME: These are wordy and unlocalized... */
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#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
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#define DEFAULT_INPUT_DEVNAME "System audio capture device"
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/*
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 * Not all of these will be compiled and linked in, but it's convenient
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 *  to have a complete list here and saves yet-another block of #ifdefs...
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 *  Please see bootstrap[], below, for the actual #ifdef mess.
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 */
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extern AudioBootStrap BSD_AUDIO_bootstrap;
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extern AudioBootStrap DSP_bootstrap;
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extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
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extern AudioBootStrap ARTS_bootstrap;
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extern AudioBootStrap ESD_bootstrap;
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extern AudioBootStrap NACLAUD_bootstrap;
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extern AudioBootStrap NAS_bootstrap;
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extern AudioBootStrap XAUDIO2_bootstrap;
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extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINMM_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
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extern AudioBootStrap HAIKUAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
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extern AudioBootStrap DISKAUD_bootstrap;
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extern AudioBootStrap DUMMYAUD_bootstrap;
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extern AudioBootStrap DCAUD_bootstrap;
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extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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extern AudioBootStrap PSPAUD_bootstrap;
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extern AudioBootStrap SNDIO_bootstrap;
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extern AudioBootStrap EmscriptenAudio_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SNDIO
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    &SNDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NACL
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   &NACLAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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    &NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_XAUDIO2
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    &XAUDIO2_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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    &DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINMM
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    &WINMM_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
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    &PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_HAIKU
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    &HAIKUAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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    &COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DISK
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    &DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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    &DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_FUSIONSOUND
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    &FUSIONSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ANDROID
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    &ANDROIDAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PSP
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    &PSPAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_EMSCRIPTEN
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    &EmscriptenAudio_bootstrap,
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#endif
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    NULL
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};
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static SDL_AudioDevice *
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get_audio_device(SDL_AudioDeviceID id)
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{
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    id--;
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    if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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        SDL_SetError("Invalid audio device ID");
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        return NULL;
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    }
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    return open_devices[id];
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}
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/* stubs for audio drivers that don't need a specific entry point... */
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static void
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SDL_AudioDetectDevices_Default(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 int
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SDL_AudioGetPendingBytes_Default(_THIS)
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{
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    return 0;
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}
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static Uint8 *
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SDL_AudioGetDeviceBuf_Default(_THIS)
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{
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    return NULL;
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}
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static void
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SDL_AudioWaitDone_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioCloseDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioDeinitialize_Default(void)
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{                               /* no-op. */
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}
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static 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 SDL_INLINE SDL_bool
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is_in_audio_device_thread(SDL_AudioDevice * device)
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{
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    /* The device thread locks the same mutex, but not through the public API.
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       This check is in case the application, in the audio callback,
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       tries to lock the thread that we've already locked from the
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       device thread...just in case we only have non-recursive mutexes. */
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return SDL_TRUE;
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    }
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    return SDL_FALSE;
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}
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static void
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SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
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{
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    if (!is_in_audio_device_thread(device)) {
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        SDL_LockMutex(device->mixer_lock);
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    }
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}
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static void
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SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
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{
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    if (!is_in_audio_device_thread(device)) {
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        SDL_UnlockMutex(device->mixer_lock);
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    }
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}
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static void
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finalize_audio_entry_points(void)
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{
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    /*
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     * Fill in stub functions for unused driver entry points. This lets us
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     *  blindly call them without having to check for validity first.
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     */
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#define FILL_STUB(x) \
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        if (current_audio.impl.x == NULL) { \
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            current_audio.impl.x = SDL_Audio##x##_Default; \
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        }
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    FILL_STUB(DetectDevices);
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    FILL_STUB(OpenDevice);
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    FILL_STUB(ThreadInit);
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    FILL_STUB(WaitDevice);
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    FILL_STUB(PlayDevice);
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    FILL_STUB(GetPendingBytes);
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    FILL_STUB(GetDeviceBuf);
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    FILL_STUB(WaitDone);
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    FILL_STUB(CloseDevice);
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    FILL_STUB(LockDevice);
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    FILL_STUB(UnlockDevice);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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#if 0  /* !!! FIXME: rewrite/remove this streamer code. */
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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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#endif
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/* buffer queueing support... */
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/* this expects that you managed thread safety elsewhere. */
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static void
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free_audio_queue(SDL_AudioBufferQueue *buffer)
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{
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    while (buffer) {
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        SDL_AudioBufferQueue *next = buffer->next;
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        SDL_free(buffer);
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        buffer = next;
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    }
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}
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static void SDLCALL
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SDL_BufferQueueDrainCallback(void *userdata, Uint8 *stream, int _len)
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{
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    /* this function always holds the mixer lock before being called. */
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    Uint32 len = (Uint32) _len;
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    SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
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    SDL_AudioBufferQueue *buffer;
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    SDL_assert(device != NULL);  /* this shouldn't ever happen, right?! */
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    SDL_assert(_len >= 0);  /* this shouldn't ever happen, right?! */
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    while ((len > 0) && ((buffer = device->buffer_queue_head) != NULL)) {
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        const Uint32 avail = buffer->datalen - buffer->startpos;
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        const Uint32 cpy = SDL_min(len, avail);
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        SDL_assert(device->queued_bytes >= avail);
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        SDL_memcpy(stream, buffer->data + buffer->startpos, cpy);
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        buffer->startpos += cpy;
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        stream += cpy;
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        device->queued_bytes -= cpy;
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        len -= cpy;
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        if (buffer->startpos == buffer->datalen) {  /* packet is done, put it in the pool. */
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            device->buffer_queue_head = buffer->next;
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            SDL_assert((buffer->next != NULL) || (buffer == device->buffer_queue_tail));
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            buffer->next = device->buffer_queue_pool;
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            device->buffer_queue_pool = buffer;
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        }
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    }
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    SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
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    if (len > 0) {  /* fill any remaining space in the stream with silence. */
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        SDL_assert(device->buffer_queue_head == NULL);
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        SDL_memset(stream, device->spec.silence, len);
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    }
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    if (device->buffer_queue_head == NULL) {
icculus@9012
   388
        device->buffer_queue_tail = NULL;  /* in case we drained the queue entirely. */
icculus@9012
   389
    }
icculus@9012
   390
}
icculus@9012
   391
icculus@9012
   392
int
icculus@9012
   393
SDL_QueueAudio(SDL_AudioDeviceID devid, const void *_data, Uint32 len)
icculus@9012
   394
{
icculus@9012
   395
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   396
    const Uint8 *data = (const Uint8 *) _data;
icculus@9012
   397
    SDL_AudioBufferQueue *orighead;
icculus@9012
   398
    SDL_AudioBufferQueue *origtail;
icculus@9012
   399
    Uint32 origlen;
icculus@9012
   400
    Uint32 datalen;
icculus@9012
   401
icculus@9012
   402
    if (!device) {
icculus@9012
   403
        return -1;  /* get_audio_device() will have set the error state */
icculus@9012
   404
    }
icculus@9012
   405
icculus@9012
   406
    if (device->spec.callback != SDL_BufferQueueDrainCallback) {
icculus@9012
   407
        return SDL_SetError("Audio device has a callback, queueing not allowed");
icculus@9012
   408
    }
icculus@9012
   409
icculus@9012
   410
    current_audio.impl.LockDevice(device);
icculus@9012
   411
icculus@9012
   412
    orighead = device->buffer_queue_head;
icculus@9012
   413
    origtail = device->buffer_queue_tail;
icculus@9012
   414
    origlen = origtail ? origtail->datalen : 0;
icculus@9012
   415
icculus@9012
   416
    while (len > 0) {
icculus@9012
   417
        SDL_AudioBufferQueue *packet = device->buffer_queue_tail;
icculus@9012
   418
        SDL_assert(!packet || (packet->datalen <= SDL_AUDIOBUFFERQUEUE_PACKETLEN));
icculus@9012
   419
        if (!packet || (packet->datalen >= SDL_AUDIOBUFFERQUEUE_PACKETLEN)) {
icculus@9012
   420
            /* tail packet missing or completely full; we need a new packet. */
icculus@9012
   421
            packet = device->buffer_queue_pool;
icculus@9012
   422
            if (packet != NULL) {
icculus@9012
   423
                /* we have one available in the pool. */
icculus@9012
   424
                device->buffer_queue_pool = packet->next;
icculus@9012
   425
            } else {
icculus@9012
   426
                /* Have to allocate a new one! */
icculus@9012
   427
                packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
   428
                if (packet == NULL) {
icculus@9012
   429
                    /* uhoh, reset so we've queued nothing new, free what we can. */
icculus@9012
   430
                    if (!origtail) {
icculus@9012
   431
                        packet = device->buffer_queue_head;  /* whole queue. */
icculus@9012
   432
                    } else {
icculus@9012
   433
                        packet = origtail->next;  /* what we added to existing queue. */
icculus@9012
   434
                        origtail->next = NULL;
icculus@9012
   435
                        origtail->datalen = origlen;
icculus@9012
   436
                    }
icculus@9012
   437
                    device->buffer_queue_head = orighead;
icculus@9012
   438
                    device->buffer_queue_tail = origtail;
icculus@9012
   439
                    device->buffer_queue_pool = NULL;
icculus@9012
   440
icculus@9012
   441
                    current_audio.impl.UnlockDevice(device);
icculus@9012
   442
icculus@9012
   443
                    free_audio_queue(packet);  /* give back what we can. */
icculus@9012
   444
icculus@9012
   445
                    return SDL_OutOfMemory();
icculus@9012
   446
                }
icculus@9012
   447
            }
icculus@9012
   448
            packet->datalen = 0;
icculus@9012
   449
            packet->startpos = 0;
icculus@9012
   450
            packet->next = NULL;
icculus@9012
   451
icculus@9012
   452
            SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   453
            if (device->buffer_queue_tail == NULL) {
icculus@9012
   454
                device->buffer_queue_head = packet;
icculus@9012
   455
            } else {
icculus@9012
   456
                device->buffer_queue_tail->next = packet;
icculus@9012
   457
            }
icculus@9012
   458
            device->buffer_queue_tail = packet;
icculus@9012
   459
        }
icculus@9012
   460
icculus@9012
   461
        datalen = SDL_min(len, SDL_AUDIOBUFFERQUEUE_PACKETLEN - packet->datalen);
icculus@9012
   462
        SDL_memcpy(packet->data + packet->datalen, data, datalen);
icculus@9012
   463
        data += datalen;
icculus@9012
   464
        len -= datalen;
icculus@9012
   465
        packet->datalen += datalen;
icculus@9012
   466
        device->queued_bytes += datalen;
icculus@9012
   467
    }
icculus@9012
   468
icculus@9012
   469
    current_audio.impl.UnlockDevice(device);
icculus@9012
   470
icculus@9012
   471
    return 0;
icculus@9012
   472
}
icculus@9012
   473
icculus@9012
   474
Uint32
icculus@9012
   475
SDL_GetQueuedAudioSize(SDL_AudioDeviceID devid)
icculus@9012
   476
{
icculus@9012
   477
    Uint32 retval = 0;
icculus@9012
   478
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9032
   479
icculus@9032
   480
    /* Nothing to do unless we're set up for queueing. */
icculus@9032
   481
    if (device && (device->spec.callback == SDL_BufferQueueDrainCallback)) {
icculus@9012
   482
        current_audio.impl.LockDevice(device);
icculus@9031
   483
        retval = device->queued_bytes + current_audio.impl.GetPendingBytes(device);
icculus@9012
   484
        current_audio.impl.UnlockDevice(device);
icculus@9012
   485
    }
icculus@9012
   486
icculus@9012
   487
    return retval;
icculus@9012
   488
}
icculus@9012
   489
icculus@9012
   490
void
icculus@9012
   491
SDL_ClearQueuedAudio(SDL_AudioDeviceID devid)
icculus@9012
   492
{
icculus@9012
   493
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9012
   494
    SDL_AudioBufferQueue *buffer = NULL;
icculus@9012
   495
    if (!device) {
icculus@9012
   496
        return;  /* nothing to do. */
icculus@9012
   497
    }
icculus@9012
   498
icculus@9012
   499
    /* Blank out the device and release the mutex. Free it afterwards. */
icculus@9012
   500
    current_audio.impl.LockDevice(device);
icculus@9012
   501
    buffer = device->buffer_queue_head;
icculus@9012
   502
    device->buffer_queue_tail = NULL;
icculus@9012
   503
    device->buffer_queue_head = NULL;
icculus@9012
   504
    device->queued_bytes = 0;
icculus@9012
   505
    current_audio.impl.UnlockDevice(device);
icculus@9012
   506
icculus@9012
   507
    free_audio_queue(buffer);
icculus@9012
   508
}
icculus@9012
   509
icculus@9012
   510
dimitris@8761
   511
#if defined(__ANDROID__)
paul@4722
   512
#include <android/log.h>
aschiffler@4865
   513
#endif
paul@4722
   514
slouken@0
   515
/* The general mixing thread function */
slouken@1895
   516
int SDLCALL
icculus@2049
   517
SDL_RunAudio(void *devicep)
slouken@0
   518
{
icculus@2049
   519
    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
slouken@1895
   520
    Uint8 *stream;
slouken@1895
   521
    int stream_len;
slouken@1895
   522
    void *udata;
slouken@1895
   523
    void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
slouken@3336
   524
    Uint32 delay;
icculus@8660
   525
icculus@8660
   526
#if 0  /* !!! FIXME: rewrite/remove this streamer code. */
airlangga@5526
   527
    /* For streaming when the buffer sizes don't match up */
airlangga@5526
   528
    Uint8 *istream;
airlangga@5526
   529
    int istream_len = 0;
icculus@8660
   530
#endif
slouken@2716
   531
slouken@5509
   532
    /* The audio mixing is always a high priority thread */
slouken@5509
   533
    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
slouken@5509
   534
slouken@1895
   535
    /* Perform any thread setup */
icculus@2049
   536
    device->threadid = SDL_ThreadID();
icculus@2049
   537
    current_audio.impl.ThreadInit(device);
slouken@0
   538
slouken@1895
   539
    /* Set up the mixing function */
icculus@2049
   540
    fill = device->spec.callback;
icculus@2049
   541
    udata = device->spec.userdata;
slouken@21
   542
slouken@2716
   543
    /* By default do not stream */
slouken@2716
   544
    device->use_streamer = 0;
slouken@2716
   545
icculus@2049
   546
    if (device->convert.needed) {
slouken@3040
   547
#if 0                           /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
slouken@2716
   548
        /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
slouken@2716
   549
        if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
slouken@2716
   550
            /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
slouken@2716
   551
            stream_max_len = 2 * device->spec.size;
slouken@2716
   552
            if (device->convert.len_mult > device->convert.len_div) {
slouken@2716
   553
                stream_max_len *= device->convert.len_mult;
slouken@2716
   554
                stream_max_len /= device->convert.len_div;
slouken@2716
   555
            }
slouken@2716
   556
            if (SDL_StreamInit(&device->streamer, stream_max_len, silence) <
slouken@2716
   557
                0)
slouken@2716
   558
                return -1;
slouken@2716
   559
            device->use_streamer = 1;
slouken@2716
   560
slouken@2716
   561
            /* istream_len should be the length of what we grab from the callback and feed to conversion,
slouken@2716
   562
               so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d
slouken@2716
   563
             */
slouken@2716
   564
            istream_len =
slouken@2716
   565
                device->spec.size * device->convert.len_div /
slouken@2716
   566
                device->convert.len_mult;
slouken@2716
   567
        }
icculus@3021
   568
#endif
slouken@7518
   569
        stream_len = device->convert.len;
slouken@1895
   570
    } else {
icculus@2049
   571
        stream_len = device->spec.size;
slouken@1895
   572
    }
icculus@1561
   573
slouken@3336
   574
    /* Calculate the delay while paused */
slouken@3336
   575
    delay = ((device->spec.samples * 1000) / device->spec.freq);
slouken@3336
   576
slouken@2716
   577
    /* Determine if the streamer is necessary here */
icculus@8658
   578
#if 0  /* !!! FIXME: rewrite/remove this streamer code. */
slouken@2716
   579
    if (device->use_streamer == 1) {
slouken@3336
   580
        /* This code is almost the same as the old code. The difference is, instead of reading
slouken@2716
   581
           directly from the callback into "stream", then converting and sending the audio off,
slouken@2716
   582
           we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device.
slouken@2716
   583
           However, reading and writing with streamer are done separately:
slouken@2716
   584
           - We only call the callback and write to the streamer when the streamer does not
slouken@2716
   585
           contain enough samples to output to the device.
slouken@2716
   586
           - We only read from the streamer and tell the device to play when the streamer
slouken@2716
   587
           does have enough samples to output.
slouken@2716
   588
           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   589
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   590
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   591
         */
slouken@2716
   592
        while (device->enabled) {
slouken@3336
   593
slouken@3336
   594
            if (device->paused) {
slouken@3336
   595
                SDL_Delay(delay);
slouken@3336
   596
                continue;
slouken@3336
   597
            }
slouken@3336
   598
slouken@2716
   599
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   600
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   601
                /* Set up istream */
slouken@2716
   602
                if (device->convert.needed) {
slouken@2716
   603
                    if (device->convert.buf) {
slouken@2716
   604
                        istream = device->convert.buf;
slouken@2716
   605
                    } else {
slouken@2716
   606
                        continue;
slouken@2716
   607
                    }
slouken@2716
   608
                } else {
slouken@3336
   609
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   610
 * a device buffer both here and below in the stream output.
slouken@3336
   611
 */
slouken@2716
   612
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   613
                    if (istream == NULL) {
slouken@2716
   614
                        istream = device->fake_stream;
slouken@2716
   615
                    }
slouken@2716
   616
                }
slouken@0
   617
slouken@2716
   618
                /* Read from the callback into the _input_ stream */
slouken@6977
   619
                SDL_LockMutex(device->mixer_lock);
slouken@3336
   620
                (*fill) (udata, istream, istream_len);
slouken@6977
   621
                SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   622
slouken@2716
   623
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   624
                if (device->convert.needed) {
slouken@2716
   625
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   626
                    if (istream == NULL) {
slouken@2716
   627
                        istream = device->fake_stream;
slouken@2716
   628
                    }
gabomdq@7678
   629
                    /* SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   630
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   631
                                    device->convert.len_cvt);
slouken@2716
   632
                } else {
slouken@2716
   633
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   634
                }
slouken@1895
   635
            }
slouken@2716
   636
slouken@2716
   637
            /* Only output audio if the streamer has enough to output */
slouken@2716
   638
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   639
                /* Set up the output stream */
slouken@2716
   640
                if (device->convert.needed) {
slouken@2716
   641
                    if (device->convert.buf) {
slouken@2716
   642
                        stream = device->convert.buf;
slouken@2716
   643
                    } else {
slouken@2716
   644
                        continue;
slouken@2716
   645
                    }
slouken@2716
   646
                } else {
slouken@2716
   647
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   648
                    if (stream == NULL) {
slouken@2716
   649
                        stream = device->fake_stream;
slouken@2716
   650
                    }
slouken@2716
   651
                }
slouken@2716
   652
slouken@2716
   653
                /* Now read from the streamer */
slouken@2716
   654
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   655
slouken@2716
   656
                /* Ready current buffer for play and change current buffer */
slouken@3336
   657
                if (stream != device->fake_stream) {
slouken@2716
   658
                    current_audio.impl.PlayDevice(device);
slouken@3096
   659
                    /* Wait for an audio buffer to become available */
slouken@3096
   660
                    current_audio.impl.WaitDevice(device);
slouken@2716
   661
                } else {
slouken@3336
   662
                    SDL_Delay(delay);
slouken@2716
   663
                }
slouken@1895
   664
            }
slouken@0
   665
slouken@1895
   666
        }
icculus@8660
   667
    } else
icculus@8658
   668
#endif
icculus@8660
   669
    {
slouken@2716
   670
        /* Otherwise, do not use the streamer. This is the old code. */
icculus@7406
   671
        const int silence = (int) device->spec.silence;
slouken@0
   672
slouken@2716
   673
        /* Loop, filling the audio buffers */
slouken@2716
   674
        while (device->enabled) {
slouken@2716
   675
slouken@2716
   676
            /* Fill the current buffer with sound */
slouken@2716
   677
            if (device->convert.needed) {
slouken@2716
   678
                if (device->convert.buf) {
slouken@2716
   679
                    stream = device->convert.buf;
slouken@2716
   680
                } else {
slouken@2716
   681
                    continue;
slouken@2716
   682
                }
slouken@2716
   683
            } else {
slouken@2716
   684
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   685
                if (stream == NULL) {
slouken@2716
   686
                    stream = device->fake_stream;
slouken@2716
   687
                }
slouken@1895
   688
            }
slouken@0
   689
icculus@7447
   690
            SDL_LockMutex(device->mixer_lock);
icculus@7406
   691
            if (device->paused) {
icculus@7406
   692
                SDL_memset(stream, silence, stream_len);
icculus@7406
   693
            } else {
icculus@7406
   694
                (*fill) (udata, stream, stream_len);
icculus@7406
   695
            }
icculus@7447
   696
            SDL_UnlockMutex(device->mixer_lock);
slouken@1562
   697
slouken@2716
   698
            /* Convert the audio if necessary */
slouken@2716
   699
            if (device->convert.needed) {
slouken@2716
   700
                SDL_ConvertAudio(&device->convert);
slouken@2716
   701
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   702
                if (stream == NULL) {
slouken@2716
   703
                    stream = device->fake_stream;
slouken@2716
   704
                }
slouken@2716
   705
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   706
                           device->convert.len_cvt);
slouken@2716
   707
            }
slouken@2716
   708
slouken@2716
   709
            /* Ready current buffer for play and change current buffer */
slouken@3336
   710
            if (stream != device->fake_stream) {
slouken@2716
   711
                current_audio.impl.PlayDevice(device);
slouken@3096
   712
                /* Wait for an audio buffer to become available */
slouken@3096
   713
                current_audio.impl.WaitDevice(device);
slouken@2716
   714
            } else {
slouken@3336
   715
                SDL_Delay(delay);
slouken@2716
   716
            }
slouken@1895
   717
        }
slouken@1895
   718
    }
slouken@1562
   719
slouken@1895
   720
    /* Wait for the audio to drain.. */
icculus@2049
   721
    current_audio.impl.WaitDone(device);
slouken@21
   722
slouken@2716
   723
    /* If necessary, deinit the streamer */
icculus@8658
   724
#if 0  /* !!! FIXME: rewrite/remove this streamer code. */
slouken@2716
   725
    if (device->use_streamer == 1)
slouken@2716
   726
        SDL_StreamDeinit(&device->streamer);
icculus@8658
   727
#endif
slouken@2716
   728
icculus@9382
   729
    return 0;
slouken@0
   730
}
slouken@0
   731
slouken@322
   732
icculus@1982
   733
static SDL_AudioFormat
slouken@1895
   734
SDL_ParseAudioFormat(const char *string)
slouken@1794
   735
{
icculus@2076
   736
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   737
    CHECK_FMT_STRING(U8);
icculus@2049
   738
    CHECK_FMT_STRING(S8);
icculus@2049
   739
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   740
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   741
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   742
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   743
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   744
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   745
    CHECK_FMT_STRING(U16);
icculus@2049
   746
    CHECK_FMT_STRING(S16);
icculus@2049
   747
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   748
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   749
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   750
    CHECK_FMT_STRING(S32);
icculus@2049
   751
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   752
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   753
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   754
    CHECK_FMT_STRING(F32);
slouken@2060
   755
#undef CHECK_FMT_STRING
icculus@2049
   756
    return 0;
slouken@1895
   757
}
slouken@1895
   758
slouken@1895
   759
int
slouken@1895
   760
SDL_GetNumAudioDrivers(void)
slouken@1895
   761
{
icculus@9382
   762
    return SDL_arraysize(bootstrap) - 1;
slouken@1895
   763
}
slouken@1895
   764
slouken@1895
   765
const char *
slouken@1895
   766
SDL_GetAudioDriver(int index)
slouken@1895
   767
{
slouken@1895
   768
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
icculus@9382
   769
        return bootstrap[index]->name;
slouken@1895
   770
    }
icculus@9382
   771
    return NULL;
slouken@1794
   772
}
slouken@1794
   773
slouken@1895
   774
int
slouken@1895
   775
SDL_AudioInit(const char *driver_name)
slouken@0
   776
{
icculus@2049
   777
    int i = 0;
icculus@2049
   778
    int initialized = 0;
icculus@2049
   779
    int tried_to_init = 0;
slouken@0
   780
icculus@2049
   781
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   782
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   783
    }
slouken@0
   784
slouken@2060
   785
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   786
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   787
slouken@1895
   788
    /* Select the proper audio driver */
slouken@1909
   789
    if (driver_name == NULL) {
slouken@1909
   790
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   791
    }
icculus@2049
   792
icculus@2049
   793
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   794
        /* make sure we should even try this driver before doing so... */
icculus@2049
   795
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   796
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   797
            (!driver_name && backend->demand_only)) {
icculus@2049
   798
            continue;
icculus@2049
   799
        }
slouken@0
   800
icculus@2049
   801
        tried_to_init = 1;
slouken@2060
   802
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   803
        current_audio.name = backend->name;
icculus@2049
   804
        current_audio.desc = backend->desc;
icculus@3699
   805
        initialized = backend->init(&current_audio.impl);
slouken@1895
   806
    }
icculus@2049
   807
icculus@2049
   808
    if (!initialized) {
icculus@2049
   809
        /* specific drivers will set the error message if they fail... */
icculus@2049
   810
        if (!tried_to_init) {
slouken@1895
   811
            if (driver_name) {
icculus@3699
   812
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   813
            } else {
slouken@1895
   814
                SDL_SetError("No available audio device");
slouken@1895
   815
            }
slouken@1895
   816
        }
icculus@2049
   817
slouken@2060
   818
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@9382
   819
        return -1;            /* No driver was available, so fail. */
slouken@1895
   820
    }
icculus@2049
   821
icculus@2049
   822
    finalize_audio_entry_points();
icculus@2049
   823
icculus@9382
   824
    return 0;
slouken@0
   825
}
slouken@0
   826
slouken@1895
   827
/*
slouken@1895
   828
 * Get the current audio driver name
slouken@1895
   829
 */
slouken@1895
   830
const char *
slouken@1895
   831
SDL_GetCurrentAudioDriver()
slouken@0
   832
{
icculus@2049
   833
    return current_audio.name;
slouken@0
   834
}
slouken@0
   835
icculus@5593
   836
static void
icculus@5593
   837
free_device_list(char ***devices, int *devCount)
icculus@5593
   838
{
icculus@5593
   839
    int i = *devCount;
icculus@5593
   840
    if ((i > 0) && (*devices != NULL)) {
icculus@5593
   841
        while (i--) {
icculus@5593
   842
            SDL_free((*devices)[i]);
icculus@5593
   843
        }
icculus@5593
   844
    }
icculus@5593
   845
slouken@7719
   846
    SDL_free(*devices);
icculus@5593
   847
icculus@5593
   848
    *devices = NULL;
icculus@5593
   849
    *devCount = 0;
icculus@5593
   850
}
icculus@5593
   851
icculus@5593
   852
static
icculus@5593
   853
void SDL_AddCaptureAudioDevice(const char *_name)
icculus@5593
   854
{
icculus@5593
   855
    char *name = NULL;
icculus@5593
   856
    void *ptr = SDL_realloc(current_audio.inputDevices,
icculus@5593
   857
                          (current_audio.inputDeviceCount+1) * sizeof(char*));
icculus@5593
   858
    if (ptr == NULL) {
icculus@5593
   859
        return;  /* oh well. */
icculus@5593
   860
    }
icculus@5593
   861
icculus@5593
   862
    current_audio.inputDevices = (char **) ptr;
icculus@5593
   863
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   864
    current_audio.inputDevices[current_audio.inputDeviceCount++] = name;
icculus@5593
   865
}
icculus@5593
   866
icculus@5593
   867
static
icculus@5593
   868
void SDL_AddOutputAudioDevice(const char *_name)
icculus@5593
   869
{
icculus@5593
   870
    char *name = NULL;
icculus@5593
   871
    void *ptr = SDL_realloc(current_audio.outputDevices,
icculus@5593
   872
                          (current_audio.outputDeviceCount+1) * sizeof(char*));
icculus@5593
   873
    if (ptr == NULL) {
icculus@5593
   874
        return;  /* oh well. */
icculus@5593
   875
    }
icculus@5593
   876
icculus@5593
   877
    current_audio.outputDevices = (char **) ptr;
icculus@5593
   878
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   879
    current_audio.outputDevices[current_audio.outputDeviceCount++] = name;
icculus@5593
   880
}
icculus@5593
   881
icculus@2049
   882
slouken@1895
   883
int
icculus@2049
   884
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   885
{
icculus@5593
   886
    int retval = 0;
icculus@5593
   887
icculus@2049
   888
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   889
        return -1;
icculus@2049
   890
    }
icculus@5593
   891
icculus@2049
   892
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   893
        return 0;
icculus@2049
   894
    }
icculus@2049
   895
icculus@2049
   896
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   897
        return 1;
icculus@2049
   898
    }
icculus@2049
   899
icculus@2049
   900
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   901
        return 1;
icculus@2049
   902
    }
icculus@2049
   903
icculus@5593
   904
    if (iscapture) {
icculus@5593
   905
        free_device_list(&current_audio.inputDevices,
icculus@5593
   906
                         &current_audio.inputDeviceCount);
icculus@5593
   907
        current_audio.impl.DetectDevices(iscapture, SDL_AddCaptureAudioDevice);
icculus@5593
   908
        retval = current_audio.inputDeviceCount;
icculus@5593
   909
    } else {
icculus@5593
   910
        free_device_list(&current_audio.outputDevices,
icculus@5593
   911
                         &current_audio.outputDeviceCount);
icculus@5593
   912
        current_audio.impl.DetectDevices(iscapture, SDL_AddOutputAudioDevice);
icculus@5593
   913
        retval = current_audio.outputDeviceCount;
icculus@5593
   914
    }
icculus@5593
   915
icculus@5593
   916
    return retval;
icculus@2049
   917
}
icculus@2049
   918
slouken@0
   919
icculus@2049
   920
const char *
icculus@2049
   921
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   922
{
icculus@2049
   923
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   924
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   925
        return NULL;
icculus@2049
   926
    }
icculus@2049
   927
icculus@2049
   928
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   929
        SDL_SetError("No capture support");
icculus@2049
   930
        return NULL;
slouken@1895
   931
    }
icculus@2049
   932
icculus@2049
   933
    if (index < 0) {
icculus@5593
   934
        goto no_such_device;
icculus@2049
   935
    }
slouken@0
   936
icculus@2049
   937
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
slouken@7904
   938
        if (index > 0) {
slouken@7904
   939
            goto no_such_device;
slouken@7904
   940
        }
icculus@2049
   941
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   942
    }
icculus@2049
   943
icculus@2049
   944
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
slouken@7904
   945
        if (index > 0) {
slouken@7904
   946
            goto no_such_device;
slouken@7904
   947
        }
icculus@2049
   948
        return DEFAULT_OUTPUT_DEVNAME;
slouken@1895
   949
    }
slouken@262
   950
icculus@5593
   951
    if (iscapture) {
icculus@5593
   952
        if (index >= current_audio.inputDeviceCount) {
icculus@5593
   953
            goto no_such_device;
icculus@5593
   954
        }
icculus@5593
   955
        return current_audio.inputDevices[index];
icculus@5593
   956
    } else {
icculus@5593
   957
        if (index >= current_audio.outputDeviceCount) {
icculus@5593
   958
            goto no_such_device;
icculus@5593
   959
        }
icculus@5593
   960
        return current_audio.outputDevices[index];
icculus@5593
   961
    }
icculus@5593
   962
icculus@5593
   963
no_such_device:
icculus@5593
   964
    SDL_SetError("No such device");
icculus@5593
   965
    return NULL;
icculus@2049
   966
}
icculus@2049
   967
icculus@2049
   968
icculus@2049
   969
static void
slouken@2060
   970
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   971
{
icculus@2049
   972
    device->enabled = 0;
icculus@2049
   973
    if (device->thread != NULL) {
icculus@2049
   974
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   975
    }
icculus@2049
   976
    if (device->mixer_lock != NULL) {
icculus@2049
   977
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   978
    }
slouken@7719
   979
    SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   980
    if (device->convert.needed) {
icculus@2049
   981
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   982
    }
icculus@2049
   983
    if (device->opened) {
icculus@2049
   984
        current_audio.impl.CloseDevice(device);
icculus@2049
   985
        device->opened = 0;
icculus@2049
   986
    }
icculus@9012
   987
icculus@9012
   988
    free_audio_queue(device->buffer_queue_head);
icculus@9012
   989
    free_audio_queue(device->buffer_queue_pool);
icculus@9012
   990
icculus@2049
   991
    SDL_FreeAudioMem(device);
icculus@2049
   992
}
icculus@2049
   993
icculus@2049
   994
icculus@2049
   995
/*
icculus@2049
   996
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   997
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   998
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   999
 */
icculus@2049
  1000
static int
slouken@2060
  1001
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
  1002
{
slouken@2060
  1003
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
  1004
icculus@2049
  1005
    if (orig->freq == 0) {
icculus@2049
  1006
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
  1007
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
  1008
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
  1009
        }
slouken@1895
  1010
    }
icculus@2049
  1011
icculus@2049
  1012
    if (orig->format == 0) {
icculus@2049
  1013
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
  1014
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
  1015
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
  1016
        }
slouken@1895
  1017
    }
icculus@2049
  1018
icculus@2049
  1019
    switch (orig->channels) {
slouken@2060
  1020
    case 0:{
slouken@2060
  1021
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
  1022
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
  1023
                prepared->channels = 2; /* a reasonable default */
slouken@2060
  1024
            }
slouken@2060
  1025
            break;
icculus@2049
  1026
        }
slouken@1895
  1027
    case 1:                    /* Mono */
slouken@1895
  1028
    case 2:                    /* Stereo */
slouken@1895
  1029
    case 4:                    /* surround */
slouken@1895
  1030
    case 6:                    /* surround with center and lfe */
slouken@1895
  1031
        break;
slouken@1895
  1032
    default:
icculus@2049
  1033
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
  1034
        return 0;
slouken@1895
  1035
    }
icculus@2049
  1036
icculus@2049
  1037
    if (orig->samples == 0) {
icculus@2049
  1038
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
  1039
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
  1040
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
  1041
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
  1042
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
  1043
            int power2 = 1;
icculus@2049
  1044
            while (power2 < samples) {
icculus@2049
  1045
                power2 *= 2;
icculus@2049
  1046
            }
icculus@2049
  1047
            prepared->samples = power2;
slouken@1895
  1048
        }
slouken@1895
  1049
    }
slouken@0
  1050
slouken@1895
  1051
    /* Calculate the silence and size of the audio specification */
icculus@2049
  1052
    SDL_CalculateAudioSpec(prepared);
slouken@21
  1053
icculus@2049
  1054
    return 1;
icculus@2049
  1055
}
slouken@1408
  1056
icculus@2049
  1057
static SDL_AudioDeviceID
icculus@2049
  1058
open_audio_device(const char *devname, int iscapture,
slouken@2866
  1059
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1060
                  int allowed_changes, int min_id)
icculus@2049
  1061
{
icculus@2049
  1062
    SDL_AudioDeviceID id = 0;
slouken@2866
  1063
    SDL_AudioSpec _obtained;
icculus@2049
  1064
    SDL_AudioDevice *device;
slouken@2866
  1065
    SDL_bool build_cvt;
icculus@2049
  1066
    int i = 0;
slouken@21
  1067
icculus@2049
  1068
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1069
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
  1070
        return 0;
icculus@2049
  1071
    }
icculus@2049
  1072
icculus@2049
  1073
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
  1074
        SDL_SetError("No capture support");
icculus@2049
  1075
        return 0;
icculus@2049
  1076
    }
icculus@2049
  1077
slouken@2866
  1078
    if (!obtained) {
slouken@2866
  1079
        obtained = &_obtained;
slouken@2866
  1080
    }
slouken@2866
  1081
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
  1082
        return 0;
icculus@2049
  1083
    }
icculus@2049
  1084
icculus@2049
  1085
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
  1086
    if (devname == NULL) {
icculus@2049
  1087
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
  1088
    }
slouken@21
  1089
icculus@2049
  1090
    /*
icculus@2049
  1091
     * Catch device names at the high level for the simple case...
icculus@2049
  1092
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
  1093
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
  1094
     *  always NULL when it hits the low level.
icculus@2049
  1095
     *
icculus@2049
  1096
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
  1097
     *  opens of the default system device.
icculus@2049
  1098
     */
icculus@2049
  1099
icculus@2049
  1100
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
  1101
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
  1102
            SDL_SetError("No such device");
icculus@2049
  1103
            return 0;
icculus@2049
  1104
        }
icculus@2049
  1105
        devname = NULL;
icculus@2049
  1106
icculus@2049
  1107
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1108
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
  1109
                SDL_SetError("Audio device already open");
icculus@2049
  1110
                return 0;
icculus@2049
  1111
            }
icculus@2049
  1112
        }
icculus@2049
  1113
    }
icculus@2049
  1114
icculus@2049
  1115
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
  1116
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
  1117
            SDL_SetError("No such device");
icculus@2049
  1118
            return 0;
icculus@2049
  1119
        }
icculus@2049
  1120
        devname = NULL;
icculus@2049
  1121
icculus@2049
  1122
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1123
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
  1124
                SDL_SetError("Audio device already open");
icculus@2049
  1125
                return 0;
icculus@2049
  1126
            }
icculus@2049
  1127
        }
icculus@2049
  1128
    }
icculus@2049
  1129
slouken@2060
  1130
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
  1131
    if (device == NULL) {
icculus@2049
  1132
        SDL_OutOfMemory();
icculus@2049
  1133
        return 0;
icculus@2049
  1134
    }
icculus@9012
  1135
    SDL_zerop(device);
slouken@2866
  1136
    device->spec = *obtained;
icculus@2049
  1137
    device->enabled = 1;
icculus@2049
  1138
    device->paused = 1;
icculus@2049
  1139
    device->iscapture = iscapture;
icculus@2049
  1140
icculus@2049
  1141
    /* Create a semaphore for locking the sound buffers */
icculus@2049
  1142
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
  1143
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
  1144
        if (device->mixer_lock == NULL) {
icculus@2049
  1145
            close_audio_device(device);
icculus@2049
  1146
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
  1147
            return 0;
icculus@2049
  1148
        }
icculus@2049
  1149
    }
icculus@2049
  1150
icculus@5593
  1151
    /* force a device detection if we haven't done one yet. */
icculus@5593
  1152
    if ( ((iscapture) && (current_audio.inputDevices == NULL)) ||
icculus@9012
  1153
         ((!iscapture) && (current_audio.outputDevices == NULL)) ) {
icculus@5593
  1154
        SDL_GetNumAudioDevices(iscapture);
icculus@9012
  1155
    }
icculus@5593
  1156
icculus@7038
  1157
    if (current_audio.impl.OpenDevice(device, devname, iscapture) < 0) {
icculus@2049
  1158
        close_audio_device(device);
icculus@2049
  1159
        return 0;
icculus@2049
  1160
    }
icculus@2049
  1161
    device->opened = 1;
slouken@0
  1162
slouken@1895
  1163
    /* Allocate a fake audio memory buffer */
aschiffler@4865
  1164
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
  1165
    if (device->fake_stream == NULL) {
icculus@2049
  1166
        close_audio_device(device);
slouken@1895
  1167
        SDL_OutOfMemory();
icculus@2049
  1168
        return 0;
slouken@1895
  1169
    }
slouken@0
  1170
slouken@1895
  1171
    /* See if we need to do any conversion */
slouken@2866
  1172
    build_cvt = SDL_FALSE;
slouken@2866
  1173
    if (obtained->freq != device->spec.freq) {
slouken@2866
  1174
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
  1175
            obtained->freq = device->spec.freq;
slouken@2866
  1176
        } else {
slouken@2866
  1177
            build_cvt = SDL_TRUE;
slouken@2866
  1178
        }
slouken@2866
  1179
    }
slouken@2866
  1180
    if (obtained->format != device->spec.format) {
slouken@2866
  1181
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
  1182
            obtained->format = device->spec.format;
slouken@2866
  1183
        } else {
slouken@2866
  1184
            build_cvt = SDL_TRUE;
slouken@2866
  1185
        }
slouken@2866
  1186
    }
slouken@2866
  1187
    if (obtained->channels != device->spec.channels) {
slouken@2866
  1188
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
  1189
            obtained->channels = device->spec.channels;
slouken@2866
  1190
        } else {
slouken@2866
  1191
            build_cvt = SDL_TRUE;
slouken@2866
  1192
        }
slouken@2866
  1193
    }
slouken@7518
  1194
slouken@7518
  1195
    /* If the audio driver changes the buffer size, accept it.
slouken@7518
  1196
       This needs to be done after the format is modified above,
slouken@7518
  1197
       otherwise it might not have the correct buffer size.
slouken@7518
  1198
     */
slouken@7518
  1199
    if (device->spec.samples != obtained->samples) {
slouken@7518
  1200
        obtained->samples = device->spec.samples;
slouken@7518
  1201
        SDL_CalculateAudioSpec(obtained);
slouken@7518
  1202
    }
slouken@7518
  1203
slouken@2866
  1204
    if (build_cvt) {
slouken@1895
  1205
        /* Build an audio conversion block */
icculus@2049
  1206
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
  1207
                              obtained->format, obtained->channels,
slouken@2866
  1208
                              obtained->freq,
icculus@2049
  1209
                              device->spec.format, device->spec.channels,
icculus@2049
  1210
                              device->spec.freq) < 0) {
icculus@2049
  1211
            close_audio_device(device);
icculus@2049
  1212
            return 0;
slouken@1895
  1213
        }
icculus@2049
  1214
        if (device->convert.needed) {
slouken@7518
  1215
            device->convert.len = (int) (((double) device->spec.size) /
slouken@2060
  1216
                                         device->convert.len_ratio);
icculus@2053
  1217
icculus@2049
  1218
            device->convert.buf =
icculus@2049
  1219
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1220
                                            device->convert.len_mult);
icculus@2049
  1221
            if (device->convert.buf == NULL) {
icculus@2049
  1222
                close_audio_device(device);
slouken@1895
  1223
                SDL_OutOfMemory();
icculus@2049
  1224
                return 0;
slouken@1895
  1225
            }
slouken@1895
  1226
        }
slouken@1895
  1227
    }
icculus@2049
  1228
icculus@9012
  1229
    if (device->spec.callback == NULL) {  /* use buffer queueing? */
icculus@9012
  1230
        /* pool a few packets to start. Enough for two callbacks. */
icculus@9012
  1231
        const int packetlen = SDL_AUDIOBUFFERQUEUE_PACKETLEN;
icculus@9012
  1232
        const int wantbytes = ((device->convert.needed) ? device->convert.len : device->spec.size) * 2;
icculus@9012
  1233
        const int wantpackets = (wantbytes / packetlen) + ((wantbytes % packetlen) ? packetlen : 0);
icculus@9012
  1234
        for (i = 0; i < wantpackets; i++) {
icculus@9012
  1235
            SDL_AudioBufferQueue *packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
  1236
            if (packet) { /* don't care if this fails, we'll deal later. */
icculus@9012
  1237
                packet->datalen = 0;
icculus@9012
  1238
                packet->startpos = 0;
icculus@9012
  1239
                packet->next = device->buffer_queue_pool;
icculus@9012
  1240
                device->buffer_queue_pool = packet;
icculus@9012
  1241
            }
icculus@9012
  1242
        }
icculus@9012
  1243
icculus@9012
  1244
        device->spec.callback = SDL_BufferQueueDrainCallback;
icculus@9012
  1245
        device->spec.userdata = device;
icculus@9012
  1246
    }
icculus@9012
  1247
icculus@2049
  1248
    /* Find an available device ID and store the structure... */
slouken@2060
  1249
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
  1250
        if (open_devices[id] == NULL) {
icculus@2049
  1251
            open_devices[id] = device;
icculus@2049
  1252
            break;
icculus@2049
  1253
        }
icculus@2049
  1254
    }
icculus@2049
  1255
icculus@2049
  1256
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
  1257
        SDL_SetError("Too many open audio devices");
icculus@2049
  1258
        close_audio_device(device);
icculus@2049
  1259
        return 0;
icculus@2049
  1260
    }
icculus@2049
  1261
slouken@1895
  1262
    /* Start the audio thread if necessary */
icculus@2049
  1263
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1264
        /* Start the audio thread */
icculus@5969
  1265
        char name[64];
icculus@5969
  1266
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) (id + 1));
icculus@2049
  1267
/* !!! FIXME: this is nasty. */
icculus@6430
  1268
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1269
#undef SDL_CreateThread
icculus@8094
  1270
#if SDL_DYNAMIC_API
icculus@8094
  1271
        device->thread = SDL_CreateThread_REAL(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1272
#else
icculus@5969
  1273
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
icculus@8094
  1274
#endif
slouken@1330
  1275
#else
icculus@5969
  1276
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1277
#endif
icculus@2049
  1278
        if (device->thread == NULL) {
slouken@2060
  1279
            SDL_CloseAudioDevice(id + 1);
slouken@1895
  1280
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1281
            return 0;
icculus@2049
  1282
        }
icculus@2049
  1283
    }
icculus@2049
  1284
slouken@2060
  1285
    return id + 1;
icculus@2049
  1286
}
icculus@2049
  1287
icculus@2049
  1288
icculus@2049
  1289
int
slouken@2866
  1290
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1291
{
icculus@2049
  1292
    SDL_AudioDeviceID id = 0;
icculus@2049
  1293
icculus@2049
  1294
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1295
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1296
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
icculus@9382
  1297
            return -1;
slouken@1895
  1298
        }
icculus@2049
  1299
    }
slouken@0
  1300
icculus@2049
  1301
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1302
    if (open_devices[0] != NULL) {
icculus@2049
  1303
        SDL_SetError("Audio device is already opened");
icculus@9382
  1304
        return -1;
slouken@1895
  1305
    }
icculus@2049
  1306
slouken@2866
  1307
    if (obtained) {
slouken@2866
  1308
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1309
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1310
    } else {
slouken@8919
  1311
        id = open_audio_device(NULL, 0, desired, NULL, 0, 1);
slouken@2866
  1312
    }
slouken@21
  1313
icculus@5964
  1314
    SDL_assert((id == 0) || (id == 1));
icculus@9382
  1315
    return (id == 0) ? -1 : 0;
icculus@2049
  1316
}
slouken@21
  1317
icculus@2049
  1318
SDL_AudioDeviceID
icculus@2049
  1319
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1320
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1321
                    int allowed_changes)
icculus@2049
  1322
{
slouken@2866
  1323
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1324
                             allowed_changes, 2);
slouken@1895
  1325
}
slouken@1895
  1326
slouken@3537
  1327
SDL_AudioStatus
icculus@2049
  1328
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1329
{
icculus@2049
  1330
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1331
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1332
    if (device && device->enabled) {
icculus@2049
  1333
        if (device->paused) {
slouken@1895
  1334
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1335
        } else {
slouken@1895
  1336
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1337
        }
slouken@1895
  1338
    }
icculus@9382
  1339
    return status;
slouken@0
  1340
}
slouken@0
  1341
icculus@2049
  1342
slouken@3537
  1343
SDL_AudioStatus
icculus@2049
  1344
SDL_GetAudioStatus(void)
icculus@2049
  1345
{
icculus@2049
  1346
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1347
}
icculus@2049
  1348
icculus@2049
  1349
void
icculus@2049
  1350
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1351
{
icculus@2049
  1352
    SDL_AudioDevice *device = get_audio_device(devid);
gabomdq@9148
  1353
    if (device) {
gabomdq@9148
  1354
        current_audio.impl.LockDevice(device);
icculus@2049
  1355
        device->paused = pause_on;
gabomdq@9148
  1356
        current_audio.impl.UnlockDevice(device);
icculus@2049
  1357
    }
icculus@2049
  1358
}
icculus@2049
  1359
slouken@1895
  1360
void
slouken@1895
  1361
SDL_PauseAudio(int pause_on)
slouken@0
  1362
{
gabomdq@9148
  1363
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1364
}
icculus@2049
  1365
slouken@0
  1366
icculus@2049
  1367
void
icculus@2049
  1368
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1369
{
icculus@2049
  1370
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1371
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1372
    if (device) {
icculus@2049
  1373
        current_audio.impl.LockDevice(device);
slouken@1895
  1374
    }
slouken@0
  1375
}
slouken@0
  1376
slouken@1895
  1377
void
slouken@1895
  1378
SDL_LockAudio(void)
slouken@0
  1379
{
icculus@2049
  1380
    SDL_LockAudioDevice(1);
icculus@2049
  1381
}
slouken@0
  1382
icculus@2049
  1383
void
icculus@2049
  1384
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1385
{
slouken@1895
  1386
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1387
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1388
    if (device) {
icculus@2049
  1389
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1390
    }
slouken@0
  1391
}
slouken@0
  1392
slouken@1895
  1393
void
slouken@1895
  1394
SDL_UnlockAudio(void)
slouken@0
  1395
{
icculus@2049
  1396
    SDL_UnlockAudioDevice(1);
icculus@2049
  1397
}
slouken@0
  1398
icculus@2049
  1399
void
icculus@2049
  1400
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1401
{
icculus@2049
  1402
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1403
    if (device) {
icculus@2049
  1404
        close_audio_device(device);
slouken@2060
  1405
        open_devices[devid - 1] = NULL;
slouken@1895
  1406
    }
slouken@0
  1407
}
slouken@0
  1408
slouken@1895
  1409
void
slouken@1895
  1410
SDL_CloseAudio(void)
slouken@0
  1411
{
icculus@2049
  1412
    SDL_CloseAudioDevice(1);
slouken@0
  1413
}
slouken@0
  1414
slouken@1895
  1415
void
slouken@1895
  1416
SDL_AudioQuit(void)
slouken@0
  1417
{
icculus@7348
  1418
    SDL_AudioDeviceID i;
icculus@7348
  1419
icculus@7345
  1420
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1421
        return;
icculus@7345
  1422
    }
icculus@7345
  1423
icculus@2049
  1424
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1425
        if (open_devices[i] != NULL) {
icculus@7446
  1426
            SDL_CloseAudioDevice(i+1);
icculus@7342
  1427
        }
icculus@2049
  1428
    }
slouken@0
  1429
icculus@2049
  1430
    /* Free the driver data */
icculus@2049
  1431
    current_audio.impl.Deinitialize();
icculus@5593
  1432
    free_device_list(&current_audio.outputDevices,
icculus@5593
  1433
                     &current_audio.outputDeviceCount);
icculus@5593
  1434
    free_device_list(&current_audio.inputDevices,
icculus@5593
  1435
                     &current_audio.inputDeviceCount);
slouken@2060
  1436
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1437
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1438
}
slouken@0
  1439
icculus@1982
  1440
#define NUM_FORMATS 10
slouken@0
  1441
static int format_idx;
slouken@0
  1442
static int format_idx_sub;
icculus@1982
  1443
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1444
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1445
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1446
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1447
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1448
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1449
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1450
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1451
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1452
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1453
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1454
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1455
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1456
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1457
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1458
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1459
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1460
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1461
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1462
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1463
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1464
};
slouken@0
  1465
icculus@1982
  1466
SDL_AudioFormat
icculus@1982
  1467
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1468
{
slouken@1895
  1469
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1470
        if (format_list[format_idx][0] == format) {
slouken@1895
  1471
            break;
slouken@1895
  1472
        }
slouken@1895
  1473
    }
slouken@1895
  1474
    format_idx_sub = 0;
icculus@9382
  1475
    return SDL_NextAudioFormat();
slouken@0
  1476
}
slouken@0
  1477
icculus@1982
  1478
SDL_AudioFormat
slouken@1895
  1479
SDL_NextAudioFormat(void)
slouken@0
  1480
{
slouken@1895
  1481
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
icculus@9382
  1482
        return 0;
slouken@1895
  1483
    }
icculus@9382
  1484
    return format_list[format_idx][format_idx_sub++];
slouken@0
  1485
}
slouken@0
  1486
slouken@1895
  1487
void
slouken@1895
  1488
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1489
{
slouken@1895
  1490
    switch (spec->format) {
slouken@1895
  1491
    case AUDIO_U8:
slouken@1895
  1492
        spec->silence = 0x80;
slouken@1895
  1493
        break;
slouken@1895
  1494
    default:
slouken@1895
  1495
        spec->silence = 0x00;
slouken@1895
  1496
        break;
slouken@1895
  1497
    }
icculus@2049
  1498
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1499
    spec->size *= spec->channels;
slouken@1895
  1500
    spec->size *= spec->samples;
slouken@0
  1501
}
slouken@1895
  1502
icculus@2049
  1503
icculus@2049
  1504
/*
icculus@2049
  1505
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1506
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1507
 */
icculus@2049
  1508
void
icculus@2049
  1509
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1510
{
icculus@2049
  1511
    /* Mix the user-level audio format */
icculus@2049
  1512
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1513
    if (device != NULL) {
icculus@2049
  1514
        SDL_AudioFormat format;
icculus@2049
  1515
        if (device->convert.needed) {
icculus@2049
  1516
            format = device->convert.src_format;
icculus@2049
  1517
        } else {
icculus@2049
  1518
            format = device->spec.format;
icculus@2049
  1519
        }
icculus@2049
  1520
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1521
    }
icculus@2049
  1522
}
icculus@2049
  1523
slouken@1895
  1524
/* vi: set ts=4 sw=4 expandtab: */