src/audio/xaudio2/SDL_xaudio2.c
author Ryan C. Gordon
Thu, 04 Aug 2011 00:31:11 -0400
changeset 5593 ab22ca13c47f
parent 5592 2e88d0742f4d
child 5615 5e060b67c73d
permissions -rw-r--r--
Cleaned up audio device detection. Cleared out a lot of cut-and-paste.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#include "../../core/windows/SDL_windows.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_assert.h"
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#define INITGUID 1
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#include "SDL_xaudio2.h"
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static __inline__ char *
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utf16_to_utf8(const WCHAR *S)
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{
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    /* !!! FIXME: this should be UTF-16, not UCS-2! */
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    return SDL_iconv_string("UTF-8", "UCS-2", (char *)(S),
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                            (SDL_wcslen(S)+1)*sizeof(WCHAR));
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}
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static void
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XAUDIO2_DetectDevices(int iscapture, SDL_AddAudioDevice addfn)
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{
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    IXAudio2 *ixa2 = NULL;
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    UINT32 devcount = 0;
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    UINT32 i = 0;
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    void *ptr = NULL;
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    if (iscapture) {
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        SDL_SetError("XAudio2: capture devices unsupported.");
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        return;
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    } else if (XAudio2Create(&ixa2, 0, XAUDIO2_DEFAULT_PROCESSOR) != S_OK) {
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        SDL_SetError("XAudio2: XAudio2Create() failed.");
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        return;
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    } else if (IXAudio2_GetDeviceCount(ixa2, &devcount) != S_OK) {
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        SDL_SetError("XAudio2: IXAudio2::GetDeviceCount() failed.");
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        IXAudio2_Release(ixa2);
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        return;
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    }
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    for (i = 0; i < devcount; i++) {
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        XAUDIO2_DEVICE_DETAILS details;
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        if (IXAudio2_GetDeviceDetails(ixa2, i, &details) == S_OK) {
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            char *str = utf16_to_utf8(details.DisplayName);
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            if (str != NULL) {
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                addfn(str);
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                SDL_free(str);  /* addfn() made a copy of the string. */
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            }
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        }
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    }
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    IXAudio2_Release(ixa2);
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}
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static void STDMETHODCALLTYPE
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VoiceCBOnBufferEnd(THIS_ void *data)
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{
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    /* Just signal the SDL audio thread and get out of XAudio2's way. */
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    SDL_AudioDevice *this = (SDL_AudioDevice *) data;
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    ReleaseSemaphore(this->hidden->semaphore, 1, NULL);
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}
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static void STDMETHODCALLTYPE
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VoiceCBOnVoiceError(THIS_ void *data, HRESULT Error)
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{
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    /* !!! FIXME: attempt to recover, or mark device disconnected. */
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    SDL_assert(0 && "write me!");
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}
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/* no-op callbacks... */
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static void STDMETHODCALLTYPE VoiceCBOnStreamEnd(THIS) {}
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static void STDMETHODCALLTYPE VoiceCBOnVoiceProcessPassStart(THIS_ UINT32 b) {}
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static void STDMETHODCALLTYPE VoiceCBOnVoiceProcessPassEnd(THIS) {}
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static void STDMETHODCALLTYPE VoiceCBOnBufferStart(THIS_ void *data) {}
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static void STDMETHODCALLTYPE VoiceCBOnLoopEnd(THIS_ void *data) {}
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static Uint8 *
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XAUDIO2_GetDeviceBuf(_THIS)
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{
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    return this->hidden->nextbuf;
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}
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static void
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XAUDIO2_PlayDevice(_THIS)
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{
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    XAUDIO2_BUFFER buffer;
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    Uint8 *mixbuf = this->hidden->mixbuf;
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    Uint8 *nextbuf = this->hidden->nextbuf;
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    const int mixlen = this->hidden->mixlen;
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    IXAudio2SourceVoice *source = this->hidden->source;
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    HRESULT result = S_OK;
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    if (!this->enabled) { /* shutting down? */
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        return;
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    }
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    /* Submit the next filled buffer */
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    SDL_zero(buffer);
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    buffer.AudioBytes = mixlen;
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    buffer.pAudioData = nextbuf;
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    buffer.pContext = this;
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    if (nextbuf == mixbuf) {
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        nextbuf += mixlen;
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    } else {
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        nextbuf = mixbuf;
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    }
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    this->hidden->nextbuf = nextbuf;
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    result = IXAudio2SourceVoice_SubmitSourceBuffer(source, &buffer, NULL);
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    if (result == XAUDIO2_E_DEVICE_INVALIDATED) {
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        /* !!! FIXME: possibly disconnected or temporary lost. Recover? */
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    }
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    if (result != S_OK) {  /* uhoh, panic! */
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        IXAudio2SourceVoice_FlushSourceBuffers(source);
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        this->enabled = 0;
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    }
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}
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static void
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XAUDIO2_WaitDevice(_THIS)
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{
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    if (this->enabled) {
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        WaitForSingleObject(this->hidden->semaphore, INFINITE);
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    }
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}
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static void
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XAUDIO2_WaitDone(_THIS)
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{
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    IXAudio2SourceVoice *source = this->hidden->source;
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    XAUDIO2_VOICE_STATE state;
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    SDL_assert(!this->enabled);  /* flag that stops playing. */
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    IXAudio2SourceVoice_Discontinuity(source);
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    IXAudio2SourceVoice_GetState(source, &state);
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    while (state.BuffersQueued > 0) {
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        WaitForSingleObject(this->hidden->semaphore, INFINITE);
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        IXAudio2SourceVoice_GetState(source, &state);
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    }
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}
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static void
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XAUDIO2_CloseDevice(_THIS)
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{
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    if (this->hidden != NULL) {
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        IXAudio2 *ixa2 = this->hidden->ixa2;
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        IXAudio2SourceVoice *source = this->hidden->source;
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        IXAudio2MasteringVoice *mastering = this->hidden->mastering;
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        if (source != NULL) {
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            IXAudio2SourceVoice_Stop(source, 0, XAUDIO2_COMMIT_NOW);
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            IXAudio2SourceVoice_FlushSourceBuffers(source);
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            IXAudio2SourceVoice_DestroyVoice(source);
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        }
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        if (ixa2 != NULL) {
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            IXAudio2_StopEngine(ixa2);
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        }
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        if (mastering != NULL) {
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            IXAudio2MasteringVoice_DestroyVoice(mastering);
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        }
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        if (ixa2 != NULL) {
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            IXAudio2_Release(ixa2);
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        }
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        if (this->hidden->mixbuf != NULL) {
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            SDL_free(this->hidden->mixbuf);
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        }
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        if (this->hidden->semaphore != NULL) {
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            CloseHandle(this->hidden->semaphore);
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        }
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        SDL_free(this->hidden);
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        this->hidden = NULL;
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    }
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}
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static int
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XAUDIO2_OpenDevice(_THIS, const char *devname, int iscapture)
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{
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    HRESULT result = S_OK;
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    WAVEFORMATEX waveformat;
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    int valid_format = 0;
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    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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    IXAudio2 *ixa2 = NULL;
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    IXAudio2SourceVoice *source = NULL;
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    UINT32 devId = 0;  /* 0 == system default device. */
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	static IXAudio2VoiceCallbackVtbl callbacks_vtable = {
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	    VoiceCBOnVoiceProcessPassStart,
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        VoiceCBOnVoiceProcessPassEnd,
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        VoiceCBOnStreamEnd,
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        VoiceCBOnBufferStart,
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        VoiceCBOnBufferEnd,
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        VoiceCBOnLoopEnd,
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        VoiceCBOnVoiceError
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	};
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	static IXAudio2VoiceCallback callbacks = { &callbacks_vtable };
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    if (iscapture) {
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        SDL_SetError("XAudio2: capture devices unsupported.");
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        return 0;
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    } else if (XAudio2Create(&ixa2, 0, XAUDIO2_DEFAULT_PROCESSOR) != S_OK) {
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        SDL_SetError("XAudio2: XAudio2Create() failed.");
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        return 0;
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    }
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    if (devname != NULL) {
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        UINT32 devcount = 0;
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        UINT32 i = 0;
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        if (IXAudio2_GetDeviceCount(ixa2, &devcount) != S_OK) {
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            IXAudio2_Release(ixa2);
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            SDL_SetError("XAudio2: IXAudio2_GetDeviceCount() failed.");
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            return 0;
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        }
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        for (i = 0; i < devcount; i++) {
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            XAUDIO2_DEVICE_DETAILS details;
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            if (IXAudio2_GetDeviceDetails(ixa2, i, &details) == S_OK) {
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                char *str = utf16_to_utf8(details.DisplayName);
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                if (str != NULL) {
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                    const int match = (SDL_strcmp(str, devname) == 0);
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                    SDL_free(str);
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                    if (match) {
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                        devId = i;
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                        break;
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                    }
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                }
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            }
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        }
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        if (i == devcount) {
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            IXAudio2_Release(ixa2);
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            SDL_SetError("XAudio2: Requested device not found.");
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            return 0;
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        }
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    }
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    /* Initialize all variables that we clean on shutdown */
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    this->hidden = (struct SDL_PrivateAudioData *)
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        SDL_malloc((sizeof *this->hidden));
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    if (this->hidden == NULL) {
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        IXAudio2_Release(ixa2);
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        SDL_OutOfMemory();
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        return 0;
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    }
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    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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    this->hidden->ixa2 = ixa2;
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    this->hidden->semaphore = CreateSemaphore(NULL, 1, 2, NULL);
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    if (this->hidden->semaphore == NULL) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: CreateSemaphore() failed!");
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        return 0;
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    }
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    while ((!valid_format) && (test_format)) {
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        switch (test_format) {
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        case AUDIO_U8:
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        case AUDIO_S16:
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        case AUDIO_S32:
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        case AUDIO_F32:
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            this->spec.format = test_format;
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            valid_format = 1;
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            break;
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        }
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        test_format = SDL_NextAudioFormat();
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    }
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    if (!valid_format) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: Unsupported audio format");
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        return 0;
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    }
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    /* Update the fragment size as size in bytes */
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    SDL_CalculateAudioSpec(&this->spec);
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    /* We feed a Source, it feeds the Mastering, which feeds the device. */
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    this->hidden->mixlen = this->spec.size;
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    this->hidden->mixbuf = (Uint8 *) SDL_malloc(2 * this->hidden->mixlen);
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    if (this->hidden->mixbuf == NULL) {
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        XAUDIO2_CloseDevice(this);
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        SDL_OutOfMemory();
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        return 0;
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    }
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    this->hidden->nextbuf = this->hidden->mixbuf;
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    SDL_memset(this->hidden->mixbuf, '\0', 2 * this->hidden->mixlen);
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    /* We use XAUDIO2_DEFAULT_CHANNELS instead of this->spec.channels. On
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       Xbox360, this means 5.1 output, but on Windows, it means "figure out
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       what the system has." It might be preferable to let XAudio2 blast
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       stereo output to appropriate surround sound configurations
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       instead of clamping to 2 channels, even though we'll configure the
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       Source Voice for whatever number of channels you supply. */
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    result = IXAudio2_CreateMasteringVoice(ixa2, &this->hidden->mastering,
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                                           XAUDIO2_DEFAULT_CHANNELS,
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                                           this->spec.freq, 0, devId, NULL);
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    if (result != S_OK) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: Couldn't create mastering voice");
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        return 0;
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    }
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    SDL_zero(waveformat);
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    if (SDL_AUDIO_ISFLOAT(this->spec.format)) {
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        waveformat.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
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    } else {
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        waveformat.wFormatTag = WAVE_FORMAT_PCM;
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    }
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    waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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    waveformat.nChannels = this->spec.channels;
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    waveformat.nSamplesPerSec = this->spec.freq;
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    waveformat.nBlockAlign =
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        waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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    waveformat.nAvgBytesPerSec =
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        waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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    result = IXAudio2_CreateSourceVoice(ixa2, &source, &waveformat,
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                                        XAUDIO2_VOICE_NOSRC |
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                                        XAUDIO2_VOICE_NOPITCH,
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                                        1.0f, &callbacks, NULL, NULL);
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    if (result != S_OK) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: Couldn't create source voice");
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        return 0;
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    }
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    this->hidden->source = source;
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    /* Start everything playing! */
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    result = IXAudio2_StartEngine(ixa2);
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    if (result != S_OK) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: Couldn't start engine");
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        return 0;
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    }
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    result = IXAudio2SourceVoice_Start(source, 0, XAUDIO2_COMMIT_NOW);
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    if (result != S_OK) {
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        XAUDIO2_CloseDevice(this);
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        SDL_SetError("XAudio2: Couldn't start source voice");
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        return 0;
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    }
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    return 1; /* good to go. */
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}
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static void
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XAUDIO2_Deinitialize(void)
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{
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    WIN_CoUninitialize();
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}
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static int
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XAUDIO2_Init(SDL_AudioDriverImpl * impl)
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{
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    /* XAudio2Create() is a macro that uses COM; we don't load the .dll */
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    IXAudio2 *ixa2 = NULL;
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    if (FAILED(WIN_CoInitialize())) {
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        SDL_SetError("XAudio2: CoInitialize() failed");
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        return 0;
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    }
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    if (XAudio2Create(&ixa2, 0, XAUDIO2_DEFAULT_PROCESSOR) != S_OK) {
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        WIN_CoUninitialize();
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        SDL_SetError("XAudio2: XAudio2Create() failed");
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        return 0;  /* not available. */
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    }
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    IXAudio2_Release(ixa2);
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    /* Set the function pointers */
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    impl->DetectDevices = XAUDIO2_DetectDevices;
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    impl->OpenDevice = XAUDIO2_OpenDevice;
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    impl->PlayDevice = XAUDIO2_PlayDevice;
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    impl->WaitDevice = XAUDIO2_WaitDevice;
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    impl->WaitDone = XAUDIO2_WaitDone;
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    impl->GetDeviceBuf = XAUDIO2_GetDeviceBuf;
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    impl->CloseDevice = XAUDIO2_CloseDevice;
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    impl->Deinitialize = XAUDIO2_Deinitialize;
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    return 1;   /* this audio target is available. */
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}
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AudioBootStrap XAUDIO2_bootstrap = {
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    "xaudio2", "XAudio2", XAUDIO2_Init, 0
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};
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/* vi: set ts=4 sw=4 expandtab: */