src/audio/SDL_audio.c
author Ryan C. Gordon
Tue, 09 Aug 2016 00:44:59 -0400
changeset 10271 4a1faf81a620
parent 10270 4d99b888e7e5
child 10277 230c0df1e152
permissions -rw-r--r--
audio: Only allocate fake_stream if we're using the standard audio threads.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2016 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_sysaudio.h"
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#include "../thread/SDL_systhread.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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/*
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 * Not all of these will be compiled and linked in, but it's convenient
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 *  to have a complete list here and saves yet-another block of #ifdefs...
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 *  Please see bootstrap[], below, for the actual #ifdef mess.
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 */
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extern AudioBootStrap BSD_AUDIO_bootstrap;
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extern AudioBootStrap DSP_bootstrap;
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extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
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extern AudioBootStrap ARTS_bootstrap;
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extern AudioBootStrap ESD_bootstrap;
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extern AudioBootStrap NACLAUD_bootstrap;
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extern AudioBootStrap NAS_bootstrap;
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extern AudioBootStrap XAUDIO2_bootstrap;
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extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINMM_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
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extern AudioBootStrap HAIKUAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
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extern AudioBootStrap DISKAUD_bootstrap;
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extern AudioBootStrap DUMMYAUD_bootstrap;
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extern AudioBootStrap DCAUD_bootstrap;
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extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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extern AudioBootStrap PSPAUD_bootstrap;
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extern AudioBootStrap SNDIO_bootstrap;
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extern AudioBootStrap EmscriptenAudio_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SNDIO
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    &SNDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NACL
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    &NACLAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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    &NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_XAUDIO2
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    &XAUDIO2_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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    &DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINMM
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    &WINMM_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
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    &PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_HAIKU
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    &HAIKUAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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    &COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DISK
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    &DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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    &DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_FUSIONSOUND
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    &FUSIONSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ANDROID
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    &ANDROIDAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PSP
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    &PSPAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_EMSCRIPTEN
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    &EmscriptenAudio_bootstrap,
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#endif
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    NULL
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};
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static SDL_AudioDevice *
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get_audio_device(SDL_AudioDeviceID id)
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{
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    id--;
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    if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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        SDL_SetError("Invalid audio device ID");
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        return NULL;
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    }
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    return open_devices[id];
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}
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/* stubs for audio drivers that don't need a specific entry point... */
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static void
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SDL_AudioDetectDevices_Default(void)
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{
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    /* you have to write your own implementation if these assertions fail. */
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    SDL_assert(current_audio.impl.OnlyHasDefaultOutputDevice);
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    SDL_assert(current_audio.impl.OnlyHasDefaultCaptureDevice || !current_audio.impl.HasCaptureSupport);
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    SDL_AddAudioDevice(SDL_FALSE, DEFAULT_OUTPUT_DEVNAME, (void *) ((size_t) 0x1));
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    if (current_audio.impl.HasCaptureSupport) {
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        SDL_AddAudioDevice(SDL_TRUE, DEFAULT_INPUT_DEVNAME, (void *) ((size_t) 0x2));
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    }
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}
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static void
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SDL_AudioThreadInit_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioWaitDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioPlayDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static int
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SDL_AudioGetPendingBytes_Default(_THIS)
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{
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    return 0;
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}
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static Uint8 *
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SDL_AudioGetDeviceBuf_Default(_THIS)
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{
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    return NULL;
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}
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static void
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SDL_AudioWaitDone_Default(_THIS)
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{                               /* no-op. */
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}
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static int
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SDL_AudioCaptureFromDevice_Default(_THIS, void *buffer, int buflen)
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{
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    return -1;  /* just fail immediately. */
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}
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static void
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SDL_AudioFlushCapture_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioCloseDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioDeinitialize_Default(void)
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{                               /* no-op. */
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}
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static void
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SDL_AudioFreeDeviceHandle_Default(void *handle)
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{                               /* no-op. */
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}
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static int
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SDL_AudioOpenDevice_Default(_THIS, void *handle, const char *devname, int iscapture)
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{
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    return SDL_Unsupported();
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}
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static SDL_INLINE SDL_bool
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is_in_audio_device_thread(SDL_AudioDevice * device)
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{
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    /* The device thread locks the same mutex, but not through the public API.
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       This check is in case the application, in the audio callback,
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       tries to lock the thread that we've already locked from the
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       device thread...just in case we only have non-recursive mutexes. */
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return SDL_TRUE;
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    }
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    return SDL_FALSE;
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}
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static void
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SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
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{
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    if (!is_in_audio_device_thread(device)) {
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        SDL_LockMutex(device->mixer_lock);
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    }
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}
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static void
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SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
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{
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    if (!is_in_audio_device_thread(device)) {
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        SDL_UnlockMutex(device->mixer_lock);
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    }
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}
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static void
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finalize_audio_entry_points(void)
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{
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    /*
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     * Fill in stub functions for unused driver entry points. This lets us
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     *  blindly call them without having to check for validity first.
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     */
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#define FILL_STUB(x) \
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        if (current_audio.impl.x == NULL) { \
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            current_audio.impl.x = SDL_Audio##x##_Default; \
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        }
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    FILL_STUB(DetectDevices);
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    FILL_STUB(OpenDevice);
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    FILL_STUB(ThreadInit);
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    FILL_STUB(WaitDevice);
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    FILL_STUB(PlayDevice);
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    FILL_STUB(GetPendingBytes);
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    FILL_STUB(GetDeviceBuf);
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    FILL_STUB(WaitDone);
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    FILL_STUB(CaptureFromDevice);
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    FILL_STUB(FlushCapture);
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    FILL_STUB(CloseDevice);
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    FILL_STUB(LockDevice);
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    FILL_STUB(UnlockDevice);
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    FILL_STUB(FreeDeviceHandle);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* device hotplug support... */
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static int
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add_audio_device(const char *name, void *handle, SDL_AudioDeviceItem **devices, int *devCount)
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{
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    int retval = -1;
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    const size_t size = sizeof (SDL_AudioDeviceItem) + SDL_strlen(name) + 1;
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    SDL_AudioDeviceItem *item = (SDL_AudioDeviceItem *) SDL_malloc(size);
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    if (item == NULL) {
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        return -1;
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    }
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    SDL_assert(handle != NULL);  /* we reserve NULL, audio backends can't use it. */
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    item->handle = handle;
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    SDL_strlcpy(item->name, name, size - sizeof (SDL_AudioDeviceItem));
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    SDL_LockMutex(current_audio.detectionLock);
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    item->next = *devices;
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    *devices = item;
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    retval = (*devCount)++;
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    SDL_UnlockMutex(current_audio.detectionLock);
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    return retval;
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}
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static SDL_INLINE int
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add_capture_device(const char *name, void *handle)
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{
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    SDL_assert(current_audio.impl.HasCaptureSupport);
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    return add_audio_device(name, handle, &current_audio.inputDevices, &current_audio.inputDeviceCount);
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}
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static SDL_INLINE int
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add_output_device(const char *name, void *handle)
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{
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    return add_audio_device(name, handle, &current_audio.outputDevices, &current_audio.outputDeviceCount);
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}
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static void
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free_device_list(SDL_AudioDeviceItem **devices, int *devCount)
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{
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    SDL_AudioDeviceItem *item, *next;
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    for (item = *devices; item != NULL; item = next) {
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        next = item->next;
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        if (item->handle != NULL) {
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            current_audio.impl.FreeDeviceHandle(item->handle);
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        }
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        SDL_free(item);
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    }
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    *devices = NULL;
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    *devCount = 0;
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}
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/* The audio backends call this when a new device is plugged in. */
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void
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SDL_AddAudioDevice(const int iscapture, const char *name, void *handle)
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{
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    const int device_index = iscapture ? add_capture_device(name, handle) : add_output_device(name, handle);
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    if (device_index != -1) {
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        /* Post the event, if desired */
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        if (SDL_GetEventState(SDL_AUDIODEVICEADDED) == SDL_ENABLE) {
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            SDL_Event event;
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            SDL_zero(event);
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            event.adevice.type = SDL_AUDIODEVICEADDED;
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            event.adevice.which = device_index;
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            event.adevice.iscapture = iscapture;
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            SDL_PushEvent(&event);
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        }
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    }
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}
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/* The audio backends call this when a currently-opened device is lost. */
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void SDL_OpenedAudioDeviceDisconnected(SDL_AudioDevice *device)
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{
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    SDL_assert(get_audio_device(device->id) == device);
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    if (!SDL_AtomicGet(&device->enabled)) {
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        return;
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    }
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    /* Ends the audio callback and mark the device as STOPPED, but the
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       app still needs to close the device to free resources. */
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    current_audio.impl.LockDevice(device);
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    SDL_AtomicSet(&device->enabled, 0);
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    current_audio.impl.UnlockDevice(device);
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    /* Post the event, if desired */
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    if (SDL_GetEventState(SDL_AUDIODEVICEREMOVED) == SDL_ENABLE) {
icculus@9394
   388
        SDL_Event event;
icculus@9401
   389
        SDL_zero(event);
icculus@9394
   390
        event.adevice.type = SDL_AUDIODEVICEREMOVED;
icculus@9394
   391
        event.adevice.which = device->id;
icculus@9394
   392
        event.adevice.iscapture = device->iscapture ? 1 : 0;
icculus@9394
   393
        SDL_PushEvent(&event);
icculus@9394
   394
    }
icculus@9394
   395
}
icculus@9393
   396
icculus@9394
   397
static void
icculus@9394
   398
mark_device_removed(void *handle, SDL_AudioDeviceItem *devices, SDL_bool *removedFlag)
icculus@9394
   399
{
icculus@9394
   400
    SDL_AudioDeviceItem *item;
icculus@9394
   401
    SDL_assert(handle != NULL);
icculus@9394
   402
    for (item = devices; item != NULL; item = item->next) {
icculus@9394
   403
        if (item->handle == handle) {
icculus@9394
   404
            item->handle = NULL;
icculus@9394
   405
            *removedFlag = SDL_TRUE;
icculus@9394
   406
            return;
icculus@9393
   407
        }
icculus@9393
   408
    }
icculus@9394
   409
}
icculus@9393
   410
icculus@9394
   411
/* The audio backends call this when a device is removed from the system. */
icculus@9394
   412
void
icculus@9399
   413
SDL_RemoveAudioDevice(const int iscapture, void *handle)
icculus@9394
   414
{
icculus@9394
   415
    SDL_LockMutex(current_audio.detectionLock);
icculus@9399
   416
    if (iscapture) {
icculus@9399
   417
        mark_device_removed(handle, current_audio.inputDevices, &current_audio.captureDevicesRemoved);
icculus@9399
   418
    } else {
icculus@9399
   419
        mark_device_removed(handle, current_audio.outputDevices, &current_audio.outputDevicesRemoved);
icculus@9399
   420
    }
icculus@9394
   421
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
   422
    current_audio.impl.FreeDeviceHandle(handle);
icculus@9393
   423
}
icculus@9393
   424
icculus@9393
   425
icculus@9012
   426
icculus@9012
   427
/* buffer queueing support... */
icculus@9012
   428
icculus@9012
   429
/* this expects that you managed thread safety elsewhere. */
icculus@9012
   430
static void
icculus@10262
   431
free_audio_queue(SDL_AudioBufferQueue *packet)
icculus@9012
   432
{
icculus@10262
   433
    while (packet) {
icculus@10262
   434
        SDL_AudioBufferQueue *next = packet->next;
icculus@10262
   435
        SDL_free(packet);
icculus@10262
   436
        packet = next;
icculus@9012
   437
    }
icculus@9012
   438
}
icculus@9012
   439
icculus@10262
   440
/* NOTE: This assumes you'll hold the mixer lock before calling! */
icculus@10262
   441
static int
icculus@10262
   442
queue_audio_to_device(SDL_AudioDevice *device, const Uint8 *data, Uint32 len)
icculus@9012
   443
{
icculus@9012
   444
    SDL_AudioBufferQueue *orighead;
icculus@9012
   445
    SDL_AudioBufferQueue *origtail;
icculus@9012
   446
    Uint32 origlen;
icculus@9012
   447
    Uint32 datalen;
icculus@9012
   448
icculus@9012
   449
    orighead = device->buffer_queue_head;
icculus@9012
   450
    origtail = device->buffer_queue_tail;
icculus@9012
   451
    origlen = origtail ? origtail->datalen : 0;
icculus@9012
   452
icculus@9012
   453
    while (len > 0) {
icculus@9012
   454
        SDL_AudioBufferQueue *packet = device->buffer_queue_tail;
icculus@9012
   455
        SDL_assert(!packet || (packet->datalen <= SDL_AUDIOBUFFERQUEUE_PACKETLEN));
icculus@9012
   456
        if (!packet || (packet->datalen >= SDL_AUDIOBUFFERQUEUE_PACKETLEN)) {
icculus@9012
   457
            /* tail packet missing or completely full; we need a new packet. */
icculus@9012
   458
            packet = device->buffer_queue_pool;
icculus@9012
   459
            if (packet != NULL) {
icculus@9012
   460
                /* we have one available in the pool. */
icculus@9012
   461
                device->buffer_queue_pool = packet->next;
icculus@9012
   462
            } else {
icculus@9012
   463
                /* Have to allocate a new one! */
icculus@9012
   464
                packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
   465
                if (packet == NULL) {
icculus@9012
   466
                    /* uhoh, reset so we've queued nothing new, free what we can. */
icculus@9012
   467
                    if (!origtail) {
icculus@9012
   468
                        packet = device->buffer_queue_head;  /* whole queue. */
icculus@9012
   469
                    } else {
icculus@9012
   470
                        packet = origtail->next;  /* what we added to existing queue. */
icculus@9012
   471
                        origtail->next = NULL;
icculus@9012
   472
                        origtail->datalen = origlen;
icculus@9012
   473
                    }
icculus@9012
   474
                    device->buffer_queue_head = orighead;
icculus@9012
   475
                    device->buffer_queue_tail = origtail;
icculus@9012
   476
                    device->buffer_queue_pool = NULL;
icculus@9012
   477
icculus@9012
   478
                    free_audio_queue(packet);  /* give back what we can. */
icculus@9012
   479
icculus@9012
   480
                    return SDL_OutOfMemory();
icculus@9012
   481
                }
icculus@9012
   482
            }
icculus@9012
   483
            packet->datalen = 0;
icculus@9012
   484
            packet->startpos = 0;
icculus@9012
   485
            packet->next = NULL;
icculus@9012
   486
icculus@9012
   487
            SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@9012
   488
            if (device->buffer_queue_tail == NULL) {
icculus@9012
   489
                device->buffer_queue_head = packet;
icculus@9012
   490
            } else {
icculus@9012
   491
                device->buffer_queue_tail->next = packet;
icculus@9012
   492
            }
icculus@9012
   493
            device->buffer_queue_tail = packet;
icculus@9012
   494
        }
icculus@9012
   495
icculus@9012
   496
        datalen = SDL_min(len, SDL_AUDIOBUFFERQUEUE_PACKETLEN - packet->datalen);
icculus@9012
   497
        SDL_memcpy(packet->data + packet->datalen, data, datalen);
icculus@9012
   498
        data += datalen;
icculus@9012
   499
        len -= datalen;
icculus@9012
   500
        packet->datalen += datalen;
icculus@9012
   501
        device->queued_bytes += datalen;
icculus@9012
   502
    }
icculus@9012
   503
icculus@10262
   504
    return 0;
icculus@10262
   505
}
icculus@10262
   506
icculus@10262
   507
/* NOTE: This assumes you'll hold the mixer lock before calling! */
icculus@10262
   508
static Uint32
icculus@10262
   509
dequeue_audio_from_device(SDL_AudioDevice *device, Uint8 *stream, Uint32 len)
icculus@10262
   510
{
icculus@10262
   511
    SDL_AudioBufferQueue *packet;
icculus@10262
   512
    Uint8 *ptr = stream;
icculus@10262
   513
icculus@10262
   514
    while ((len > 0) && ((packet = device->buffer_queue_head) != NULL)) {
icculus@10262
   515
        const Uint32 avail = packet->datalen - packet->startpos;
icculus@10262
   516
        const Uint32 cpy = SDL_min(len, avail);
icculus@10262
   517
        SDL_assert(device->queued_bytes >= avail);
icculus@10262
   518
icculus@10262
   519
        SDL_memcpy(ptr, packet->data + packet->startpos, cpy);
icculus@10262
   520
        packet->startpos += cpy;
icculus@10262
   521
        ptr += cpy;
icculus@10262
   522
        device->queued_bytes -= cpy;
icculus@10262
   523
        len -= cpy;
icculus@10262
   524
icculus@10262
   525
        if (packet->startpos == packet->datalen) {  /* packet is done, put it in the pool. */
icculus@10262
   526
            device->buffer_queue_head = packet->next;
icculus@10262
   527
            SDL_assert((packet->next != NULL) || (packet == device->buffer_queue_tail));
icculus@10262
   528
            packet->next = device->buffer_queue_pool;
icculus@10262
   529
            device->buffer_queue_pool = packet;
icculus@10262
   530
        }
icculus@10262
   531
    }
icculus@10262
   532
icculus@10262
   533
    SDL_assert((device->buffer_queue_head != NULL) == (device->queued_bytes != 0));
icculus@10262
   534
icculus@10262
   535
    if (device->buffer_queue_head == NULL) {
icculus@10262
   536
        device->buffer_queue_tail = NULL;  /* in case we drained the queue entirely. */
icculus@10262
   537
    }
icculus@10262
   538
icculus@10262
   539
    return (Uint32) (ptr - stream);
icculus@10262
   540
}
icculus@10262
   541
icculus@10262
   542
static void SDLCALL
icculus@10262
   543
SDL_BufferQueueDrainCallback(void *userdata, Uint8 *stream, int len)
icculus@10262
   544
{
icculus@10262
   545
    /* this function always holds the mixer lock before being called. */
icculus@10262
   546
    SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
icculus@10262
   547
    Uint32 written;
icculus@10262
   548
icculus@10262
   549
    SDL_assert(device != NULL);  /* this shouldn't ever happen, right?! */
icculus@10262
   550
    SDL_assert(!device->iscapture);  /* this shouldn't ever happen, right?! */
icculus@10262
   551
    SDL_assert(len >= 0);  /* this shouldn't ever happen, right?! */
icculus@10262
   552
icculus@10262
   553
    written = dequeue_audio_from_device(device, stream, (Uint32) len);
icculus@10262
   554
    stream += written;
icculus@10262
   555
    len -= (int) written;
icculus@9012
   556
icculus@10262
   557
    if (len > 0) {  /* fill any remaining space in the stream with silence. */
icculus@10262
   558
        SDL_assert(device->buffer_queue_head == NULL);
icculus@10262
   559
        SDL_memset(stream, device->spec.silence, len);
icculus@10262
   560
    }
icculus@10262
   561
}
icculus@10262
   562
icculus@10262
   563
static void SDLCALL
icculus@10262
   564
SDL_BufferQueueFillCallback(void *userdata, Uint8 *stream, int len)
icculus@10262
   565
{
icculus@10262
   566
    /* this function always holds the mixer lock before being called. */
icculus@10262
   567
    SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
icculus@10262
   568
icculus@10262
   569
    SDL_assert(device != NULL);  /* this shouldn't ever happen, right?! */
icculus@10262
   570
    SDL_assert(device->iscapture);  /* this shouldn't ever happen, right?! */
icculus@10262
   571
    SDL_assert(len >= 0);  /* this shouldn't ever happen, right?! */
icculus@10262
   572
icculus@10262
   573
    /* note that if this needs to allocate more space and run out of memory,
icculus@10262
   574
       we have no choice but to quietly drop the data and hope it works out
icculus@10262
   575
       later, but you probably have bigger problems in this case anyhow. */
icculus@10262
   576
    queue_audio_to_device(device, stream, (Uint32) len);
icculus@10262
   577
}
icculus@10262
   578
icculus@10262
   579
int
icculus@10262
   580
SDL_QueueAudio(SDL_AudioDeviceID devid, const void *data, Uint32 len)
icculus@10262
   581
{
icculus@10262
   582
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@10262
   583
    int rc = 0;
icculus@10262
   584
icculus@10262
   585
    if (!device) {
icculus@10262
   586
        return -1;  /* get_audio_device() will have set the error state */
icculus@10262
   587
    } else if (device->iscapture) {
icculus@10262
   588
        return SDL_SetError("This is a capture device, queueing not allowed");
icculus@10262
   589
    } else if (device->spec.callback != SDL_BufferQueueDrainCallback) {
icculus@10262
   590
        return SDL_SetError("Audio device has a callback, queueing not allowed");
icculus@10262
   591
    }
icculus@10262
   592
icculus@10262
   593
    if (len > 0) {
icculus@10262
   594
        current_audio.impl.LockDevice(device);
icculus@10262
   595
        rc = queue_audio_to_device(device, data, len);
icculus@10262
   596
        current_audio.impl.UnlockDevice(device);
icculus@10262
   597
    }
icculus@10262
   598
icculus@10262
   599
    return rc;
icculus@10262
   600
}
icculus@10262
   601
icculus@10262
   602
Uint32
icculus@10262
   603
SDL_DequeueAudio(SDL_AudioDeviceID devid, void *data, Uint32 len)
icculus@10262
   604
{
icculus@10262
   605
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@10262
   606
    Uint32 rc;
icculus@10262
   607
icculus@10262
   608
    if ( (len == 0) ||  /* nothing to do? */
icculus@10262
   609
         (!device) ||  /* called with bogus device id */
icculus@10262
   610
         (!device->iscapture) ||  /* playback devices can't dequeue */
icculus@10262
   611
         (device->spec.callback != SDL_BufferQueueFillCallback) ) { /* not set for queueing */
icculus@10262
   612
        return 0;  /* just report zero bytes dequeued. */
icculus@10262
   613
    }
icculus@10262
   614
icculus@10262
   615
    current_audio.impl.LockDevice(device);
icculus@10262
   616
    rc = dequeue_audio_from_device(device, data, len);
icculus@10262
   617
    current_audio.impl.UnlockDevice(device);
icculus@10262
   618
    return rc;
icculus@9012
   619
}
icculus@9012
   620
icculus@9012
   621
Uint32
icculus@9012
   622
SDL_GetQueuedAudioSize(SDL_AudioDeviceID devid)
icculus@9012
   623
{
icculus@9012
   624
    Uint32 retval = 0;
icculus@9012
   625
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@9032
   626
icculus@10262
   627
    if (!device) {
icculus@10262
   628
        return 0;
icculus@10262
   629
    }
icculus@10262
   630
icculus@9032
   631
    /* Nothing to do unless we're set up for queueing. */
icculus@10262
   632
    if (device->spec.callback == SDL_BufferQueueDrainCallback) {
icculus@9012
   633
        current_audio.impl.LockDevice(device);
icculus@9031
   634
        retval = device->queued_bytes + current_audio.impl.GetPendingBytes(device);
icculus@9012
   635
        current_audio.impl.UnlockDevice(device);
icculus@10262
   636
    } else if (device->spec.callback == SDL_BufferQueueFillCallback) {
icculus@10262
   637
        current_audio.impl.LockDevice(device);
icculus@10262
   638
        retval = device->queued_bytes;
icculus@10262
   639
        current_audio.impl.UnlockDevice(device);
icculus@9012
   640
    }
icculus@9012
   641
icculus@9012
   642
    return retval;
icculus@9012
   643
}
icculus@9012
   644
icculus@9012
   645
void
icculus@9012
   646
SDL_ClearQueuedAudio(SDL_AudioDeviceID devid)
icculus@9012
   647
{
icculus@9012
   648
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@10260
   649
    SDL_AudioBufferQueue *packet;
icculus@10260
   650
icculus@9012
   651
    if (!device) {
icculus@9012
   652
        return;  /* nothing to do. */
icculus@9012
   653
    }
icculus@9012
   654
icculus@9012
   655
    /* Blank out the device and release the mutex. Free it afterwards. */
icculus@9012
   656
    current_audio.impl.LockDevice(device);
icculus@10260
   657
icculus@10260
   658
    /* merge the available pool and the current queue into one list. */
icculus@10260
   659
    packet = device->buffer_queue_head;
icculus@10260
   660
    if (packet) {
icculus@10260
   661
        device->buffer_queue_tail->next = device->buffer_queue_pool;
icculus@10260
   662
    } else {
icculus@10260
   663
        packet = device->buffer_queue_pool;
icculus@10260
   664
    }
icculus@10260
   665
icculus@10260
   666
    /* Remove the queued packets from the device. */
icculus@9012
   667
    device->buffer_queue_tail = NULL;
icculus@9012
   668
    device->buffer_queue_head = NULL;
icculus@9012
   669
    device->queued_bytes = 0;
icculus@10260
   670
    device->buffer_queue_pool = packet;
icculus@10260
   671
icculus@10260
   672
    /* Keep up to two packets in the pool to reduce future malloc pressure. */
icculus@10260
   673
    if (packet) {
icculus@10260
   674
        if (!packet->next) {
icculus@10260
   675
            packet = NULL;  /* one packet (the only one) for the pool. */
icculus@10260
   676
        } else {
icculus@10260
   677
            SDL_AudioBufferQueue *next = packet->next->next;
icculus@10260
   678
            packet->next->next = NULL;  /* two packets for the pool. */
icculus@10260
   679
            packet = next;  /* rest will be freed. */
icculus@10260
   680
        }
icculus@10260
   681
    }
icculus@10260
   682
icculus@9012
   683
    current_audio.impl.UnlockDevice(device);
icculus@9012
   684
icculus@10260
   685
    /* free any extra packets we didn't keep in the pool. */
icculus@10260
   686
    free_audio_queue(packet);
icculus@9012
   687
}
icculus@9012
   688
icculus@9012
   689
slouken@0
   690
/* The general mixing thread function */
icculus@10239
   691
static int SDLCALL
icculus@2049
   692
SDL_RunAudio(void *devicep)
slouken@0
   693
{
icculus@2049
   694
    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
icculus@9398
   695
    const int silence = (int) device->spec.silence;
icculus@9398
   696
    const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
icculus@9398
   697
    const int stream_len = (device->convert.needed) ? device->convert.len : device->spec.size;
slouken@1895
   698
    Uint8 *stream;
icculus@9398
   699
    void *udata = device->spec.userdata;
icculus@10239
   700
    void (SDLCALL *callback) (void *, Uint8 *, int) = device->spec.callback;
icculus@10239
   701
icculus@10239
   702
    SDL_assert(!device->iscapture);
slouken@2716
   703
slouken@5509
   704
    /* The audio mixing is always a high priority thread */
slouken@5509
   705
    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
slouken@5509
   706
slouken@1895
   707
    /* Perform any thread setup */
icculus@2049
   708
    device->threadid = SDL_ThreadID();
icculus@2049
   709
    current_audio.impl.ThreadInit(device);
slouken@0
   710
icculus@9398
   711
    /* Loop, filling the audio buffers */
icculus@10233
   712
    while (!SDL_AtomicGet(&device->shutdown)) {
icculus@9398
   713
        /* Fill the current buffer with sound */
icculus@9398
   714
        if (device->convert.needed) {
icculus@9398
   715
            stream = device->convert.buf;
icculus@10238
   716
        } else if (SDL_AtomicGet(&device->enabled)) {
icculus@9398
   717
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9398
   718
        } else {
icculus@9398
   719
            /* if the device isn't enabled, we still write to the
icculus@9398
   720
               fake_stream, so the app's callback will fire with
icculus@9398
   721
               a regular frequency, in case they depend on that
icculus@9398
   722
               for timing or progress. They can use hotplug
icculus@9398
   723
               now to know if the device failed. */
icculus@9398
   724
            stream = NULL;
slouken@2716
   725
        }
slouken@3336
   726
icculus@9398
   727
        if (stream == NULL) {
icculus@9398
   728
            stream = device->fake_stream;
icculus@9398
   729
        }
slouken@2716
   730
icculus@9398
   731
        /* !!! FIXME: this should be LockDevice. */
icculus@9398
   732
        SDL_LockMutex(device->mixer_lock);
icculus@10238
   733
        if (SDL_AtomicGet(&device->paused)) {
icculus@9398
   734
            SDL_memset(stream, silence, stream_len);
icculus@9398
   735
        } else {
icculus@10239
   736
            (*callback) (udata, stream, stream_len);
icculus@9398
   737
        }
icculus@9398
   738
        SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   739
icculus@9398
   740
        /* Convert the audio if necessary */
icculus@10238
   741
        if (device->convert.needed && SDL_AtomicGet(&device->enabled)) {
icculus@9398
   742
            SDL_ConvertAudio(&device->convert);
icculus@9398
   743
            stream = current_audio.impl.GetDeviceBuf(device);
icculus@9397
   744
            if (stream == NULL) {
icculus@9397
   745
                stream = device->fake_stream;
icculus@9398
   746
            } else {
icculus@9398
   747
                SDL_memcpy(stream, device->convert.buf,
icculus@9398
   748
                           device->convert.len_cvt);
slouken@1895
   749
            }
icculus@9398
   750
        }
slouken@1562
   751
icculus@9398
   752
        /* Ready current buffer for play and change current buffer */
icculus@9398
   753
        if (stream == device->fake_stream) {
icculus@9398
   754
            SDL_Delay(delay);
icculus@9398
   755
        } else {
icculus@9398
   756
            current_audio.impl.PlayDevice(device);
icculus@9398
   757
            current_audio.impl.WaitDevice(device);
slouken@1895
   758
        }
slouken@1895
   759
    }
slouken@1562
   760
icculus@9398
   761
    /* Wait for the audio to drain. */
icculus@10239
   762
    /* !!! FIXME: can we rename this WaitDrain? */
icculus@2049
   763
    current_audio.impl.WaitDone(device);
slouken@21
   764
icculus@9382
   765
    return 0;
slouken@0
   766
}
slouken@0
   767
icculus@10239
   768
/* The general capture thread function */
icculus@10239
   769
static int SDLCALL
icculus@10239
   770
SDL_CaptureAudio(void *devicep)
icculus@10239
   771
{
icculus@10239
   772
    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
icculus@10239
   773
    const int silence = (int) device->spec.silence;
icculus@10239
   774
    const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
icculus@10239
   775
    const int stream_len = (device->convert.needed) ? device->convert.len : device->spec.size;
icculus@10239
   776
    Uint8 *stream;
icculus@10239
   777
    void *udata = device->spec.userdata;
icculus@10239
   778
    void (SDLCALL *callback) (void *, Uint8 *, int) = device->spec.callback;
icculus@10239
   779
icculus@10239
   780
    SDL_assert(device->iscapture);
icculus@10239
   781
icculus@10239
   782
    /* The audio mixing is always a high priority thread */
icculus@10239
   783
    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
icculus@10239
   784
icculus@10239
   785
    /* Perform any thread setup */
icculus@10239
   786
    device->threadid = SDL_ThreadID();
icculus@10239
   787
    current_audio.impl.ThreadInit(device);
icculus@10239
   788
icculus@10239
   789
    /* Loop, filling the audio buffers */
icculus@10239
   790
    while (!SDL_AtomicGet(&device->shutdown)) {
icculus@10239
   791
        int still_need;
icculus@10239
   792
        Uint8 *ptr;
icculus@10239
   793
icculus@10239
   794
        if (!SDL_AtomicGet(&device->enabled) || SDL_AtomicGet(&device->paused)) {
icculus@10239
   795
            SDL_Delay(delay);  /* just so we don't cook the CPU. */
icculus@10239
   796
            current_audio.impl.FlushCapture(device);  /* dump anything pending. */
icculus@10239
   797
            continue;
icculus@10239
   798
        }
icculus@10239
   799
icculus@10239
   800
        /* Fill the current buffer with sound */
icculus@10239
   801
        still_need = stream_len;
icculus@10239
   802
        if (device->convert.needed) {
icculus@10239
   803
            ptr = stream = device->convert.buf;
icculus@10239
   804
        } else {
icculus@10239
   805
            /* just use the "fake" stream to hold data read from the device. */
icculus@10239
   806
            ptr = stream = device->fake_stream;
icculus@10239
   807
        }
icculus@10239
   808
icculus@10239
   809
        /* We still read from the device when "paused" to keep the state sane,
icculus@10239
   810
           and block when there isn't data so this thread isn't eating CPU.
icculus@10239
   811
           But we don't process it further or call the app's callback. */
icculus@10239
   812
icculus@10239
   813
        while (still_need > 0) {
icculus@10239
   814
            const int rc = current_audio.impl.CaptureFromDevice(device, ptr, still_need);
icculus@10239
   815
            SDL_assert(rc <= still_need);  /* device should not overflow buffer. :) */
icculus@10239
   816
            if (rc > 0) {
icculus@10239
   817
                still_need -= rc;
icculus@10239
   818
                ptr += rc;
icculus@10239
   819
            } else {  /* uhoh, device failed for some reason! */
icculus@10239
   820
                SDL_OpenedAudioDeviceDisconnected(device);
icculus@10239
   821
                break;
icculus@10239
   822
            }
icculus@10239
   823
        }
icculus@10239
   824
icculus@10239
   825
        if (still_need > 0) {
icculus@10239
   826
            /* Keep any data we already read, silence the rest. */
icculus@10239
   827
            SDL_memset(ptr, silence, still_need);
icculus@10239
   828
        }
icculus@10239
   829
icculus@10239
   830
        if (device->convert.needed) {
icculus@10239
   831
            SDL_ConvertAudio(&device->convert);
icculus@10239
   832
        }
icculus@10239
   833
icculus@10239
   834
        /* !!! FIXME: this should be LockDevice. */
icculus@10239
   835
        SDL_LockMutex(device->mixer_lock);
icculus@10241
   836
        if (SDL_AtomicGet(&device->paused)) {
icculus@10241
   837
            current_audio.impl.FlushCapture(device);  /* one snuck in! */
icculus@10241
   838
        } else {
icculus@10239
   839
            (*callback)(udata, stream, stream_len);
icculus@10239
   840
        }
icculus@10239
   841
        SDL_UnlockMutex(device->mixer_lock);
icculus@10239
   842
    }
icculus@10239
   843
icculus@10239
   844
    current_audio.impl.FlushCapture(device);
icculus@10239
   845
icculus@10239
   846
    return 0;
icculus@10239
   847
}
icculus@10239
   848
slouken@322
   849
icculus@1982
   850
static SDL_AudioFormat
slouken@1895
   851
SDL_ParseAudioFormat(const char *string)
slouken@1794
   852
{
icculus@2076
   853
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   854
    CHECK_FMT_STRING(U8);
icculus@2049
   855
    CHECK_FMT_STRING(S8);
icculus@2049
   856
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   857
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   858
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   859
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   860
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   861
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   862
    CHECK_FMT_STRING(U16);
icculus@2049
   863
    CHECK_FMT_STRING(S16);
icculus@2049
   864
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   865
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   866
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   867
    CHECK_FMT_STRING(S32);
icculus@2049
   868
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   869
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   870
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   871
    CHECK_FMT_STRING(F32);
slouken@2060
   872
#undef CHECK_FMT_STRING
icculus@2049
   873
    return 0;
slouken@1895
   874
}
slouken@1895
   875
slouken@1895
   876
int
slouken@1895
   877
SDL_GetNumAudioDrivers(void)
slouken@1895
   878
{
icculus@9382
   879
    return SDL_arraysize(bootstrap) - 1;
slouken@1895
   880
}
slouken@1895
   881
slouken@1895
   882
const char *
slouken@1895
   883
SDL_GetAudioDriver(int index)
slouken@1895
   884
{
slouken@1895
   885
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
icculus@9382
   886
        return bootstrap[index]->name;
slouken@1895
   887
    }
icculus@9382
   888
    return NULL;
slouken@1794
   889
}
slouken@1794
   890
slouken@1895
   891
int
slouken@1895
   892
SDL_AudioInit(const char *driver_name)
slouken@0
   893
{
icculus@2049
   894
    int i = 0;
icculus@2049
   895
    int initialized = 0;
icculus@2049
   896
    int tried_to_init = 0;
slouken@0
   897
icculus@2049
   898
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   899
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   900
    }
slouken@0
   901
icculus@9392
   902
    SDL_zero(current_audio);
icculus@9392
   903
    SDL_zero(open_devices);
icculus@2049
   904
slouken@1895
   905
    /* Select the proper audio driver */
slouken@1909
   906
    if (driver_name == NULL) {
slouken@1909
   907
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   908
    }
icculus@2049
   909
icculus@2049
   910
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   911
        /* make sure we should even try this driver before doing so... */
icculus@2049
   912
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   913
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   914
            (!driver_name && backend->demand_only)) {
icculus@2049
   915
            continue;
icculus@2049
   916
        }
slouken@0
   917
icculus@2049
   918
        tried_to_init = 1;
icculus@9392
   919
        SDL_zero(current_audio);
icculus@2049
   920
        current_audio.name = backend->name;
icculus@2049
   921
        current_audio.desc = backend->desc;
icculus@3699
   922
        initialized = backend->init(&current_audio.impl);
slouken@1895
   923
    }
icculus@2049
   924
icculus@2049
   925
    if (!initialized) {
icculus@2049
   926
        /* specific drivers will set the error message if they fail... */
icculus@2049
   927
        if (!tried_to_init) {
slouken@1895
   928
            if (driver_name) {
icculus@3699
   929
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   930
            } else {
slouken@1895
   931
                SDL_SetError("No available audio device");
slouken@1895
   932
            }
slouken@1895
   933
        }
icculus@2049
   934
icculus@9392
   935
        SDL_zero(current_audio);
icculus@9382
   936
        return -1;            /* No driver was available, so fail. */
slouken@1895
   937
    }
icculus@2049
   938
icculus@9394
   939
    current_audio.detectionLock = SDL_CreateMutex();
icculus@9393
   940
icculus@2049
   941
    finalize_audio_entry_points();
icculus@2049
   942
icculus@9393
   943
    /* Make sure we have a list of devices available at startup. */
icculus@9394
   944
    current_audio.impl.DetectDevices();
icculus@9393
   945
icculus@9382
   946
    return 0;
slouken@0
   947
}
slouken@0
   948
slouken@1895
   949
/*
slouken@1895
   950
 * Get the current audio driver name
slouken@1895
   951
 */
slouken@1895
   952
const char *
slouken@1895
   953
SDL_GetCurrentAudioDriver()
slouken@0
   954
{
icculus@2049
   955
    return current_audio.name;
slouken@0
   956
}
slouken@0
   957
icculus@9394
   958
/* Clean out devices that we've removed but had to keep around for stability. */
icculus@9394
   959
static void
icculus@9394
   960
clean_out_device_list(SDL_AudioDeviceItem **devices, int *devCount, SDL_bool *removedFlag)
icculus@9394
   961
{
icculus@9394
   962
    SDL_AudioDeviceItem *item = *devices;
icculus@9394
   963
    SDL_AudioDeviceItem *prev = NULL;
icculus@9394
   964
    int total = 0;
icculus@9394
   965
icculus@9394
   966
    while (item) {
icculus@9394
   967
        SDL_AudioDeviceItem *next = item->next;
icculus@9394
   968
        if (item->handle != NULL) {
icculus@9394
   969
            total++;
icculus@9394
   970
            prev = item;
icculus@9394
   971
        } else {
icculus@9394
   972
            if (prev) {
icculus@9394
   973
                prev->next = next;
icculus@9394
   974
            } else {
icculus@9394
   975
                *devices = next;
icculus@9394
   976
            }
icculus@9394
   977
            SDL_free(item);
icculus@9394
   978
        }
icculus@9394
   979
        item = next;
icculus@9394
   980
    }
icculus@9394
   981
icculus@9394
   982
    *devCount = total;
icculus@9394
   983
    *removedFlag = SDL_FALSE;
icculus@9394
   984
}
icculus@9394
   985
icculus@9394
   986
slouken@1895
   987
int
icculus@2049
   988
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   989
{
icculus@5593
   990
    int retval = 0;
icculus@5593
   991
icculus@2049
   992
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   993
        return -1;
icculus@2049
   994
    }
icculus@5593
   995
icculus@9394
   996
    SDL_LockMutex(current_audio.detectionLock);
icculus@9394
   997
    if (iscapture && current_audio.captureDevicesRemoved) {
icculus@9394
   998
        clean_out_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount, &current_audio.captureDevicesRemoved);
icculus@2049
   999
    }
icculus@2049
  1000
icculus@9394
  1001
    if (!iscapture && current_audio.outputDevicesRemoved) {
icculus@9394
  1002
        clean_out_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount, &current_audio.outputDevicesRemoved);
icculus@9394
  1003
        current_audio.outputDevicesRemoved = SDL_FALSE;
icculus@5593
  1004
    }
icculus@5593
  1005
icculus@9393
  1006
    retval = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
  1007
    SDL_UnlockMutex(current_audio.detectionLock);
icculus@9393
  1008
icculus@5593
  1009
    return retval;
icculus@2049
  1010
}
icculus@2049
  1011
slouken@0
  1012
icculus@2049
  1013
const char *
icculus@2049
  1014
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
  1015
{
icculus@9393
  1016
    const char *retval = NULL;
icculus@9393
  1017
icculus@2049
  1018
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1019
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
  1020
        return NULL;
icculus@2049
  1021
    }
icculus@2049
  1022
icculus@2049
  1023
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
  1024
        SDL_SetError("No capture support");
icculus@2049
  1025
        return NULL;
slouken@1895
  1026
    }
icculus@2049
  1027
icculus@9394
  1028
    if (index >= 0) {
icculus@9394
  1029
        SDL_AudioDeviceItem *item;
icculus@9394
  1030
        int i;
slouken@0
  1031
icculus@9394
  1032
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
  1033
        item = iscapture ? current_audio.inputDevices : current_audio.outputDevices;
icculus@9394
  1034
        i = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
icculus@9394
  1035
        if (index < i) {
icculus@9394
  1036
            for (i--; i > index; i--, item = item->next) {
icculus@9394
  1037
                SDL_assert(item != NULL);
icculus@9394
  1038
            }
icculus@9394
  1039
            SDL_assert(item != NULL);
icculus@9394
  1040
            retval = item->name;
slouken@7904
  1041
        }
icculus@9394
  1042
        SDL_UnlockMutex(current_audio.detectionLock);
slouken@1895
  1043
    }
slouken@262
  1044
icculus@9394
  1045
    if (retval == NULL) {
icculus@9394
  1046
        SDL_SetError("No such device");
icculus@5593
  1047
    }
icculus@5593
  1048
icculus@9394
  1049
    return retval;
icculus@2049
  1050
}
icculus@2049
  1051
icculus@2049
  1052
icculus@2049
  1053
static void
slouken@2060
  1054
close_audio_device(SDL_AudioDevice * device)
icculus@2049
  1055
{
icculus@10233
  1056
    SDL_AtomicSet(&device->shutdown, 1);
icculus@10238
  1057
    SDL_AtomicSet(&device->enabled, 0);
icculus@2049
  1058
    if (device->thread != NULL) {
icculus@2049
  1059
        SDL_WaitThread(device->thread, NULL);
icculus@2049
  1060
    }
icculus@2049
  1061
    if (device->mixer_lock != NULL) {
icculus@2049
  1062
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
  1063
    }
icculus@10256
  1064
    SDL_free(device->fake_stream);
icculus@2049
  1065
    if (device->convert.needed) {
icculus@10256
  1066
        SDL_free(device->convert.buf);
icculus@2049
  1067
    }
icculus@10255
  1068
    if (device->hidden != NULL) {
icculus@2049
  1069
        current_audio.impl.CloseDevice(device);
icculus@2049
  1070
    }
icculus@9012
  1071
icculus@9012
  1072
    free_audio_queue(device->buffer_queue_head);
icculus@9012
  1073
    free_audio_queue(device->buffer_queue_pool);
icculus@9012
  1074
icculus@10256
  1075
    SDL_free(device);
icculus@2049
  1076
}
icculus@2049
  1077
icculus@2049
  1078
icculus@2049
  1079
/*
icculus@2049
  1080
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
  1081
 *  Fills in a sanitized copy in (prepared).
icculus@2049
  1082
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
  1083
 */
icculus@2049
  1084
static int
slouken@2060
  1085
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
  1086
{
slouken@2060
  1087
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
  1088
icculus@2049
  1089
    if (orig->freq == 0) {
icculus@2049
  1090
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
  1091
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
  1092
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
  1093
        }
slouken@1895
  1094
    }
icculus@2049
  1095
icculus@2049
  1096
    if (orig->format == 0) {
icculus@2049
  1097
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
  1098
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
  1099
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
  1100
        }
slouken@1895
  1101
    }
icculus@2049
  1102
icculus@2049
  1103
    switch (orig->channels) {
slouken@2060
  1104
    case 0:{
slouken@2060
  1105
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
  1106
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
  1107
                prepared->channels = 2; /* a reasonable default */
slouken@2060
  1108
            }
slouken@2060
  1109
            break;
icculus@2049
  1110
        }
slouken@1895
  1111
    case 1:                    /* Mono */
slouken@1895
  1112
    case 2:                    /* Stereo */
slouken@1895
  1113
    case 4:                    /* surround */
slouken@1895
  1114
    case 6:                    /* surround with center and lfe */
slouken@1895
  1115
        break;
slouken@1895
  1116
    default:
icculus@2049
  1117
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
  1118
        return 0;
slouken@1895
  1119
    }
icculus@2049
  1120
icculus@2049
  1121
    if (orig->samples == 0) {
icculus@2049
  1122
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
  1123
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
  1124
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
  1125
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
  1126
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
  1127
            int power2 = 1;
icculus@2049
  1128
            while (power2 < samples) {
icculus@2049
  1129
                power2 *= 2;
icculus@2049
  1130
            }
icculus@2049
  1131
            prepared->samples = power2;
slouken@1895
  1132
        }
slouken@1895
  1133
    }
slouken@0
  1134
slouken@1895
  1135
    /* Calculate the silence and size of the audio specification */
icculus@2049
  1136
    SDL_CalculateAudioSpec(prepared);
slouken@21
  1137
icculus@2049
  1138
    return 1;
icculus@2049
  1139
}
slouken@1408
  1140
icculus@2049
  1141
static SDL_AudioDeviceID
icculus@2049
  1142
open_audio_device(const char *devname, int iscapture,
slouken@2866
  1143
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1144
                  int allowed_changes, int min_id)
icculus@2049
  1145
{
icculus@10270
  1146
    const SDL_bool is_internal_thread = (desired->callback != NULL);
icculus@2049
  1147
    SDL_AudioDeviceID id = 0;
slouken@2866
  1148
    SDL_AudioSpec _obtained;
icculus@2049
  1149
    SDL_AudioDevice *device;
slouken@2866
  1150
    SDL_bool build_cvt;
icculus@9394
  1151
    void *handle = NULL;
icculus@2049
  1152
    int i = 0;
slouken@21
  1153
icculus@2049
  1154
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1155
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
  1156
        return 0;
icculus@2049
  1157
    }
icculus@2049
  1158
icculus@2049
  1159
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
  1160
        SDL_SetError("No capture support");
icculus@2049
  1161
        return 0;
icculus@2049
  1162
    }
icculus@2049
  1163
icculus@9393
  1164
    /* Find an available device ID... */
icculus@9393
  1165
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@9393
  1166
        if (open_devices[id] == NULL) {
icculus@9393
  1167
            break;
icculus@9393
  1168
        }
icculus@9393
  1169
    }
icculus@9393
  1170
icculus@9393
  1171
    if (id == SDL_arraysize(open_devices)) {
icculus@9393
  1172
        SDL_SetError("Too many open audio devices");
icculus@9393
  1173
        return 0;
icculus@9393
  1174
    }
icculus@9393
  1175
slouken@2866
  1176
    if (!obtained) {
slouken@2866
  1177
        obtained = &_obtained;
slouken@2866
  1178
    }
slouken@2866
  1179
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
  1180
        return 0;
icculus@2049
  1181
    }
icculus@2049
  1182
icculus@2049
  1183
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
  1184
    if (devname == NULL) {
icculus@2049
  1185
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
  1186
    }
slouken@21
  1187
icculus@2049
  1188
    /*
icculus@2049
  1189
     * Catch device names at the high level for the simple case...
icculus@2049
  1190
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
  1191
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
  1192
     *  always NULL when it hits the low level.
icculus@2049
  1193
     *
icculus@2049
  1194
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
  1195
     *  opens of the default system device.
icculus@2049
  1196
     */
icculus@2049
  1197
icculus@10258
  1198
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultCaptureDevice)) {
icculus@2049
  1199
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
  1200
            SDL_SetError("No such device");
icculus@2049
  1201
            return 0;
icculus@2049
  1202
        }
icculus@2049
  1203
        devname = NULL;
icculus@2049
  1204
icculus@2049
  1205
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1206
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
  1207
                SDL_SetError("Audio device already open");
icculus@2049
  1208
                return 0;
icculus@2049
  1209
            }
icculus@2049
  1210
        }
icculus@9394
  1211
    } else if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
  1212
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
  1213
            SDL_SetError("No such device");
icculus@2049
  1214
            return 0;
icculus@2049
  1215
        }
icculus@2049
  1216
        devname = NULL;
icculus@2049
  1217
icculus@2049
  1218
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
  1219
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
  1220
                SDL_SetError("Audio device already open");
icculus@2049
  1221
                return 0;
icculus@2049
  1222
            }
icculus@2049
  1223
        }
icculus@9394
  1224
    } else if (devname != NULL) {
icculus@9394
  1225
        /* if the app specifies an exact string, we can pass the backend
icculus@9394
  1226
           an actual device handle thingey, which saves them the effort of
icculus@9394
  1227
           figuring out what device this was (such as, reenumerating
icculus@9394
  1228
           everything again to find the matching human-readable name).
icculus@9394
  1229
           It might still need to open a device based on the string for,
icculus@9394
  1230
           say, a network audio server, but this optimizes some cases. */
icculus@9394
  1231
        SDL_AudioDeviceItem *item;
icculus@9394
  1232
        SDL_LockMutex(current_audio.detectionLock);
icculus@9394
  1233
        for (item = iscapture ? current_audio.inputDevices : current_audio.outputDevices; item; item = item->next) {
icculus@9394
  1234
            if ((item->handle != NULL) && (SDL_strcmp(item->name, devname) == 0)) {
icculus@9394
  1235
                handle = item->handle;
icculus@9394
  1236
                break;
icculus@9394
  1237
            }
icculus@9394
  1238
        }
icculus@9394
  1239
        SDL_UnlockMutex(current_audio.detectionLock);
icculus@9394
  1240
    }
icculus@9394
  1241
icculus@9394
  1242
    if (!current_audio.impl.AllowsArbitraryDeviceNames) {
icculus@9394
  1243
        /* has to be in our device list, or the default device. */
icculus@9394
  1244
        if ((handle == NULL) && (devname != NULL)) {
icculus@9394
  1245
            SDL_SetError("No such device.");
icculus@9394
  1246
            return 0;
icculus@9394
  1247
        }
icculus@2049
  1248
    }
icculus@2049
  1249
icculus@10256
  1250
    device = (SDL_AudioDevice *) SDL_calloc(1, sizeof (SDL_AudioDevice));
icculus@2049
  1251
    if (device == NULL) {
icculus@2049
  1252
        SDL_OutOfMemory();
icculus@2049
  1253
        return 0;
icculus@2049
  1254
    }
icculus@9393
  1255
    device->id = id + 1;
slouken@2866
  1256
    device->spec = *obtained;
icculus@10235
  1257
    device->iscapture = iscapture ? SDL_TRUE : SDL_FALSE;
icculus@2049
  1258
icculus@10238
  1259
    SDL_AtomicSet(&device->shutdown, 0);  /* just in case. */
icculus@10238
  1260
    SDL_AtomicSet(&device->paused, 1);
icculus@10238
  1261
    SDL_AtomicSet(&device->enabled, 1);
icculus@10238
  1262
icculus@9391
  1263
    /* Create a mutex for locking the sound buffers */
icculus@2049
  1264
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
  1265
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
  1266
        if (device->mixer_lock == NULL) {
icculus@2049
  1267
            close_audio_device(device);
icculus@2049
  1268
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
  1269
            return 0;
icculus@2049
  1270
        }
icculus@2049
  1271
    }
icculus@2049
  1272
icculus@9394
  1273
    if (current_audio.impl.OpenDevice(device, handle, devname, iscapture) < 0) {
icculus@2049
  1274
        close_audio_device(device);
icculus@2049
  1275
        return 0;
icculus@2049
  1276
    }
icculus@10255
  1277
icculus@10255
  1278
    /* if your target really doesn't need it, set it to 0x1 or something. */
icculus@10255
  1279
    /* otherwise, close_audio_device() won't call impl.CloseDevice(). */
icculus@10255
  1280
    SDL_assert(device->hidden != NULL);
slouken@0
  1281
slouken@1895
  1282
    /* See if we need to do any conversion */
slouken@2866
  1283
    build_cvt = SDL_FALSE;
slouken@2866
  1284
    if (obtained->freq != device->spec.freq) {
slouken@2866
  1285
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
  1286
            obtained->freq = device->spec.freq;
slouken@2866
  1287
        } else {
slouken@2866
  1288
            build_cvt = SDL_TRUE;
slouken@2866
  1289
        }
slouken@2866
  1290
    }
slouken@2866
  1291
    if (obtained->format != device->spec.format) {
slouken@2866
  1292
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
  1293
            obtained->format = device->spec.format;
slouken@2866
  1294
        } else {
slouken@2866
  1295
            build_cvt = SDL_TRUE;
slouken@2866
  1296
        }
slouken@2866
  1297
    }
slouken@2866
  1298
    if (obtained->channels != device->spec.channels) {
slouken@2866
  1299
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
  1300
            obtained->channels = device->spec.channels;
slouken@2866
  1301
        } else {
slouken@2866
  1302
            build_cvt = SDL_TRUE;
slouken@2866
  1303
        }
slouken@2866
  1304
    }
slouken@7518
  1305
slouken@7518
  1306
    /* If the audio driver changes the buffer size, accept it.
slouken@7518
  1307
       This needs to be done after the format is modified above,
slouken@7518
  1308
       otherwise it might not have the correct buffer size.
slouken@7518
  1309
     */
slouken@7518
  1310
    if (device->spec.samples != obtained->samples) {
slouken@7518
  1311
        obtained->samples = device->spec.samples;
slouken@7518
  1312
        SDL_CalculateAudioSpec(obtained);
slouken@7518
  1313
    }
slouken@7518
  1314
slouken@2866
  1315
    if (build_cvt) {
slouken@1895
  1316
        /* Build an audio conversion block */
icculus@2049
  1317
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
  1318
                              obtained->format, obtained->channels,
slouken@2866
  1319
                              obtained->freq,
icculus@2049
  1320
                              device->spec.format, device->spec.channels,
icculus@2049
  1321
                              device->spec.freq) < 0) {
icculus@2049
  1322
            close_audio_device(device);
icculus@2049
  1323
            return 0;
slouken@1895
  1324
        }
icculus@2049
  1325
        if (device->convert.needed) {
slouken@7518
  1326
            device->convert.len = (int) (((double) device->spec.size) /
slouken@2060
  1327
                                         device->convert.len_ratio);
icculus@2053
  1328
icculus@2049
  1329
            device->convert.buf =
icculus@10256
  1330
                (Uint8 *) SDL_malloc(device->convert.len *
icculus@2049
  1331
                                            device->convert.len_mult);
icculus@2049
  1332
            if (device->convert.buf == NULL) {
icculus@2049
  1333
                close_audio_device(device);
slouken@1895
  1334
                SDL_OutOfMemory();
icculus@2049
  1335
                return 0;
slouken@1895
  1336
            }
slouken@1895
  1337
        }
slouken@1895
  1338
    }
icculus@2049
  1339
icculus@9012
  1340
    if (device->spec.callback == NULL) {  /* use buffer queueing? */
icculus@9012
  1341
        /* pool a few packets to start. Enough for two callbacks. */
icculus@9012
  1342
        const int packetlen = SDL_AUDIOBUFFERQUEUE_PACKETLEN;
icculus@9012
  1343
        const int wantbytes = ((device->convert.needed) ? device->convert.len : device->spec.size) * 2;
icculus@9012
  1344
        const int wantpackets = (wantbytes / packetlen) + ((wantbytes % packetlen) ? packetlen : 0);
icculus@9012
  1345
        for (i = 0; i < wantpackets; i++) {
icculus@9012
  1346
            SDL_AudioBufferQueue *packet = (SDL_AudioBufferQueue *) SDL_malloc(sizeof (SDL_AudioBufferQueue));
icculus@9012
  1347
            if (packet) { /* don't care if this fails, we'll deal later. */
icculus@9012
  1348
                packet->datalen = 0;
icculus@9012
  1349
                packet->startpos = 0;
icculus@9012
  1350
                packet->next = device->buffer_queue_pool;
icculus@9012
  1351
                device->buffer_queue_pool = packet;
icculus@9012
  1352
            }
icculus@9012
  1353
        }
icculus@9012
  1354
icculus@10262
  1355
        device->spec.callback = iscapture ? SDL_BufferQueueFillCallback : SDL_BufferQueueDrainCallback;
icculus@9012
  1356
        device->spec.userdata = device;
icculus@9012
  1357
    }
icculus@9012
  1358
icculus@9393
  1359
    /* add it to our list of open devices. */
icculus@9393
  1360
    open_devices[id] = device;
icculus@2049
  1361
slouken@1895
  1362
    /* Start the audio thread if necessary */
icculus@2049
  1363
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1364
        /* Start the audio thread */
icculus@10146
  1365
icculus@10271
  1366
        /* Allocate a fake audio buffer; only used by our internal threads. */
icculus@10271
  1367
        Uint32 stream_len = (device->convert.needed) ? device->convert.len_cvt : 0;
icculus@10271
  1368
        if (device->spec.size > stream_len) {
icculus@10271
  1369
            stream_len = device->spec.size;
icculus@10271
  1370
        }
icculus@10271
  1371
        SDL_assert(stream_len > 0);
icculus@10271
  1372
icculus@10271
  1373
        device->fake_stream = (Uint8 *) SDL_malloc(stream_len);
icculus@10271
  1374
        if (device->fake_stream == NULL) {
icculus@10271
  1375
            close_audio_device(device);
icculus@10271
  1376
            SDL_OutOfMemory();
icculus@10271
  1377
            return 0;
icculus@10271
  1378
        }
icculus@10271
  1379
icculus@10146
  1380
        /* !!! FIXME: we don't force the audio thread stack size here because it calls into user code, but maybe we should? */
icculus@10146
  1381
        /* buffer queueing callback only needs a few bytes, so make the stack tiny. */
icculus@5969
  1382
        char name[64];
icculus@10239
  1383
        const size_t stacksize = is_internal_thread ? 64 * 1024 : 0;
icculus@9393
  1384
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) device->id);
icculus@10239
  1385
        device->thread = SDL_CreateThreadInternal(iscapture ? SDL_CaptureAudio : SDL_RunAudio, name, stacksize, device);
icculus@10146
  1386
icculus@2049
  1387
        if (device->thread == NULL) {
icculus@9393
  1388
            SDL_CloseAudioDevice(device->id);
slouken@1895
  1389
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1390
            return 0;
icculus@2049
  1391
        }
icculus@2049
  1392
    }
icculus@2049
  1393
icculus@9393
  1394
    return device->id;
icculus@2049
  1395
}
icculus@2049
  1396
icculus@2049
  1397
icculus@2049
  1398
int
slouken@2866
  1399
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1400
{
icculus@2049
  1401
    SDL_AudioDeviceID id = 0;
icculus@2049
  1402
icculus@2049
  1403
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1404
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1405
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
icculus@9382
  1406
            return -1;
slouken@1895
  1407
        }
icculus@2049
  1408
    }
slouken@0
  1409
icculus@2049
  1410
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1411
    if (open_devices[0] != NULL) {
icculus@2049
  1412
        SDL_SetError("Audio device is already opened");
icculus@9382
  1413
        return -1;
slouken@1895
  1414
    }
icculus@2049
  1415
slouken@2866
  1416
    if (obtained) {
slouken@2866
  1417
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1418
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1419
    } else {
slouken@8919
  1420
        id = open_audio_device(NULL, 0, desired, NULL, 0, 1);
slouken@2866
  1421
    }
slouken@21
  1422
icculus@5964
  1423
    SDL_assert((id == 0) || (id == 1));
icculus@9382
  1424
    return (id == 0) ? -1 : 0;
icculus@2049
  1425
}
slouken@21
  1426
icculus@2049
  1427
SDL_AudioDeviceID
icculus@2049
  1428
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1429
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1430
                    int allowed_changes)
icculus@2049
  1431
{
slouken@2866
  1432
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1433
                             allowed_changes, 2);
slouken@1895
  1434
}
slouken@1895
  1435
slouken@3537
  1436
SDL_AudioStatus
icculus@2049
  1437
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1438
{
icculus@2049
  1439
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1440
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@10238
  1441
    if (device && SDL_AtomicGet(&device->enabled)) {
icculus@10238
  1442
        if (SDL_AtomicGet(&device->paused)) {
slouken@1895
  1443
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1444
        } else {
slouken@1895
  1445
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1446
        }
slouken@1895
  1447
    }
icculus@9382
  1448
    return status;
slouken@0
  1449
}
slouken@0
  1450
icculus@2049
  1451
slouken@3537
  1452
SDL_AudioStatus
icculus@2049
  1453
SDL_GetAudioStatus(void)
icculus@2049
  1454
{
icculus@2049
  1455
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1456
}
icculus@2049
  1457
icculus@2049
  1458
void
icculus@2049
  1459
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1460
{
icculus@2049
  1461
    SDL_AudioDevice *device = get_audio_device(devid);
gabomdq@9148
  1462
    if (device) {
gabomdq@9148
  1463
        current_audio.impl.LockDevice(device);
icculus@10238
  1464
        SDL_AtomicSet(&device->paused, pause_on ? 1 : 0);
gabomdq@9148
  1465
        current_audio.impl.UnlockDevice(device);
icculus@2049
  1466
    }
icculus@2049
  1467
}
icculus@2049
  1468
slouken@1895
  1469
void
slouken@1895
  1470
SDL_PauseAudio(int pause_on)
slouken@0
  1471
{
gabomdq@9148
  1472
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1473
}
icculus@2049
  1474
slouken@0
  1475
icculus@2049
  1476
void
icculus@2049
  1477
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1478
{
icculus@2049
  1479
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1480
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1481
    if (device) {
icculus@2049
  1482
        current_audio.impl.LockDevice(device);
slouken@1895
  1483
    }
slouken@0
  1484
}
slouken@0
  1485
slouken@1895
  1486
void
slouken@1895
  1487
SDL_LockAudio(void)
slouken@0
  1488
{
icculus@2049
  1489
    SDL_LockAudioDevice(1);
icculus@2049
  1490
}
slouken@0
  1491
icculus@2049
  1492
void
icculus@2049
  1493
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1494
{
slouken@1895
  1495
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1496
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1497
    if (device) {
icculus@2049
  1498
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1499
    }
slouken@0
  1500
}
slouken@0
  1501
slouken@1895
  1502
void
slouken@1895
  1503
SDL_UnlockAudio(void)
slouken@0
  1504
{
icculus@2049
  1505
    SDL_UnlockAudioDevice(1);
icculus@2049
  1506
}
slouken@0
  1507
icculus@2049
  1508
void
icculus@2049
  1509
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1510
{
icculus@2049
  1511
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1512
    if (device) {
icculus@2049
  1513
        close_audio_device(device);
slouken@2060
  1514
        open_devices[devid - 1] = NULL;
slouken@1895
  1515
    }
slouken@0
  1516
}
slouken@0
  1517
slouken@1895
  1518
void
slouken@1895
  1519
SDL_CloseAudio(void)
slouken@0
  1520
{
icculus@2049
  1521
    SDL_CloseAudioDevice(1);
slouken@0
  1522
}
slouken@0
  1523
slouken@1895
  1524
void
slouken@1895
  1525
SDL_AudioQuit(void)
slouken@0
  1526
{
icculus@7348
  1527
    SDL_AudioDeviceID i;
icculus@7348
  1528
icculus@7345
  1529
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1530
        return;
icculus@7345
  1531
    }
icculus@7345
  1532
icculus@2049
  1533
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1534
        if (open_devices[i] != NULL) {
icculus@7446
  1535
            SDL_CloseAudioDevice(i+1);
icculus@7342
  1536
        }
icculus@2049
  1537
    }
slouken@0
  1538
icculus@9394
  1539
    free_device_list(&current_audio.outputDevices, &current_audio.outputDeviceCount);
icculus@9394
  1540
    free_device_list(&current_audio.inputDevices, &current_audio.inputDeviceCount);
icculus@9394
  1541
icculus@2049
  1542
    /* Free the driver data */
icculus@2049
  1543
    current_audio.impl.Deinitialize();
icculus@9393
  1544
icculus@9394
  1545
    SDL_DestroyMutex(current_audio.detectionLock);
icculus@9393
  1546
icculus@9393
  1547
    SDL_zero(current_audio);
icculus@9393
  1548
    SDL_zero(open_devices);
slouken@0
  1549
}
slouken@0
  1550
icculus@1982
  1551
#define NUM_FORMATS 10
slouken@0
  1552
static int format_idx;
slouken@0
  1553
static int format_idx_sub;
icculus@1982
  1554
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1555
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1556
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1557
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1558
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1559
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1560
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1561
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1562
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1563
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1564
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1565
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1566
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1567
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1568
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1569
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1570
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1571
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1572
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1573
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1574
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1575
};
slouken@0
  1576
icculus@1982
  1577
SDL_AudioFormat
icculus@1982
  1578
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1579
{
slouken@1895
  1580
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1581
        if (format_list[format_idx][0] == format) {
slouken@1895
  1582
            break;
slouken@1895
  1583
        }
slouken@1895
  1584
    }
slouken@1895
  1585
    format_idx_sub = 0;
icculus@9382
  1586
    return SDL_NextAudioFormat();
slouken@0
  1587
}
slouken@0
  1588
icculus@1982
  1589
SDL_AudioFormat
slouken@1895
  1590
SDL_NextAudioFormat(void)
slouken@0
  1591
{
slouken@1895
  1592
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
icculus@9382
  1593
        return 0;
slouken@1895
  1594
    }
icculus@9382
  1595
    return format_list[format_idx][format_idx_sub++];
slouken@0
  1596
}
slouken@0
  1597
slouken@1895
  1598
void
slouken@1895
  1599
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1600
{
slouken@1895
  1601
    switch (spec->format) {
slouken@1895
  1602
    case AUDIO_U8:
slouken@1895
  1603
        spec->silence = 0x80;
slouken@1895
  1604
        break;
slouken@1895
  1605
    default:
slouken@1895
  1606
        spec->silence = 0x00;
slouken@1895
  1607
        break;
slouken@1895
  1608
    }
icculus@2049
  1609
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1610
    spec->size *= spec->channels;
slouken@1895
  1611
    spec->size *= spec->samples;
slouken@0
  1612
}
slouken@1895
  1613
icculus@2049
  1614
icculus@2049
  1615
/*
icculus@2049
  1616
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1617
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1618
 */
icculus@2049
  1619
void
icculus@2049
  1620
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1621
{
icculus@2049
  1622
    /* Mix the user-level audio format */
icculus@2049
  1623
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1624
    if (device != NULL) {
icculus@2049
  1625
        SDL_AudioFormat format;
icculus@2049
  1626
        if (device->convert.needed) {
icculus@2049
  1627
            format = device->convert.src_format;
icculus@2049
  1628
        } else {
icculus@2049
  1629
            format = device->spec.format;
icculus@2049
  1630
        }
icculus@2049
  1631
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1632
    }
icculus@2049
  1633
}
icculus@2049
  1634
slouken@1895
  1635
/* vi: set ts=4 sw=4 expandtab: */