286 lines
8.7 KiB
C
286 lines
8.7 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <memory.h>
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#include <windows.h>
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#include <mmsystem.h>
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#include <dsound.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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typedef struct {
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// DirectSound Playback Device
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LPDIRECTSOUND lpDS;
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LPDIRECTSOUNDBUFFER DSpbuffer;
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LPDIRECTSOUNDBUFFER DSsbuffer;
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MMRESULT ulDSTimerID;
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DWORD OldWriteCursor;
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} DSoundData;
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static ALCchar *DeviceList[16];
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static void CALLBACK DirectSoundProc(UINT uID,UINT uReserved,DWORD_PTR dwUser,DWORD_PTR dwReserved1,DWORD_PTR dwReserved2)
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{
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ALCdevice *pDevice = (ALCdevice *)dwUser;
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DSoundData *pData = pDevice->ExtraData;
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DWORD PlayCursor,WriteCursor;
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BYTE *WritePtr1,*WritePtr2;
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DWORD WriteCnt1,WriteCnt2;
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WAVEFORMATEX OutputType;
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DWORD BytesPlayed;
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DWORD BufSize;
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HRESULT DSRes;
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(void)uID;
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(void)uReserved;
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(void)dwReserved1;
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(void)dwReserved2;
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BufSize = pDevice->UpdateFreq * pDevice->FrameSize;
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// Get current play and write cursors
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IDirectSoundBuffer_GetCurrentPosition(pData->DSsbuffer,&PlayCursor,&WriteCursor);
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if (!pData->OldWriteCursor) pData->OldWriteCursor=WriteCursor-PlayCursor;
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// Get the output format and figure the number of bytes played (block aligned)
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IDirectSoundBuffer_GetFormat(pData->DSsbuffer,&OutputType,sizeof(WAVEFORMATEX),NULL);
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BytesPlayed=((((WriteCursor<pData->OldWriteCursor)?(BufSize+WriteCursor-pData->OldWriteCursor):(WriteCursor-pData->OldWriteCursor))/OutputType.nBlockAlign)*OutputType.nBlockAlign);
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// Lock output buffer started at 40msec in front of the old write cursor (15msec in front of the actual write cursor)
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DSRes=IDirectSoundBuffer_Lock(pData->DSsbuffer,(pData->OldWriteCursor+(OutputType.nSamplesPerSec/25)*OutputType.nBlockAlign)%BufSize,BytesPlayed,(LPVOID*)&WritePtr1,&WriteCnt1,(LPVOID*)&WritePtr2,&WriteCnt2,0);
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// If the buffer is lost, restore it, play and lock
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if (DSRes==DSERR_BUFFERLOST)
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{
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IDirectSoundBuffer_Restore(pData->DSsbuffer);
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IDirectSoundBuffer_Play(pData->DSsbuffer,0,0,DSBPLAY_LOOPING);
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DSRes=IDirectSoundBuffer_Lock(pData->DSsbuffer,(pData->OldWriteCursor+(OutputType.nSamplesPerSec/25)*OutputType.nBlockAlign)%BufSize,BytesPlayed,(LPVOID*)&WritePtr1,&WriteCnt1,(LPVOID*)&WritePtr2,&WriteCnt2,0);
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}
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// Successfully locked the output buffer
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if (DSRes==DS_OK)
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{
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// If we have an active context, mix data directly into output buffer otherwise fill with silence
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SuspendContext(NULL);
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if (WritePtr1)
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aluMixData(pDevice->Context, WritePtr1, WriteCnt1, pDevice->Format);
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if (WritePtr2)
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aluMixData(pDevice->Context, WritePtr2, WriteCnt2, pDevice->Format);
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ProcessContext(NULL);
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// Unlock output buffer only when successfully locked
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IDirectSoundBuffer_Unlock(pData->DSsbuffer,WritePtr1,WriteCnt1,WritePtr2,WriteCnt2);
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}
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// Update old write cursor location
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pData->OldWriteCursor=((pData->OldWriteCursor+BytesPlayed)%BufSize);
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}
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static ALCboolean DSoundOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
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{
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DSBUFFERDESC DSBDescription;
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DSoundData *pData = NULL;
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WAVEFORMATEX OutputType;
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HRESULT hr;
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if(deviceName)
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{
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int i;
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for(i = 0;DeviceList[i];i++)
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{
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if(strcmp(deviceName, DeviceList[i]) == 0)
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{
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device->szDeviceName = DeviceList[i];
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break;
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}
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}
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if(!DeviceList[i])
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return ALC_FALSE;
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}
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else
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device->szDeviceName = DeviceList[0];
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//Platform specific
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memset(&OutputType, 0, sizeof(WAVEFORMATEX));
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OutputType.wFormatTag = WAVE_FORMAT_PCM;
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OutputType.nChannels = device->Channels;
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OutputType.wBitsPerSample = aluBytesFromFormat(device->Format) * 8;
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OutputType.nBlockAlign = OutputType.nChannels*OutputType.wBitsPerSample/8;
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OutputType.nSamplesPerSec = device->Frequency;
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OutputType.nAvgBytesPerSec = OutputType.nSamplesPerSec*OutputType.nBlockAlign;
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OutputType.cbSize = 0;
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//Initialise requested device
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pData = calloc(1, sizeof(DSoundData));
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if(!pData)
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{
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SetALCError(ALC_OUT_OF_MEMORY);
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return ALC_FALSE;
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}
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//Init COM
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CoInitialize(NULL);
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//DirectSound Init code
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hr = CoCreateInstance(&CLSID_DirectSound, NULL, CLSCTX_INPROC_SERVER, &IID_IDirectSound, (LPVOID*)&pData->lpDS);
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if(SUCCEEDED(hr))
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hr = IDirectSound_Initialize(pData->lpDS, NULL);
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if(SUCCEEDED(hr))
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hr = IDirectSound_SetCooperativeLevel(pData->lpDS, GetForegroundWindow(), DSSCL_PRIORITY);
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if(SUCCEEDED(hr))
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{
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memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
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DSBDescription.dwSize=sizeof(DSBUFFERDESC);
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DSBDescription.dwFlags=DSBCAPS_PRIMARYBUFFER;
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hr = IDirectSound_CreateSoundBuffer(pData->lpDS, &DSBDescription, &pData->DSpbuffer, NULL);
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}
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if(SUCCEEDED(hr))
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hr = IDirectSoundBuffer_SetFormat(pData->DSpbuffer,&OutputType);
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if(SUCCEEDED(hr))
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{
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memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
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DSBDescription.dwSize=sizeof(DSBUFFERDESC);
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DSBDescription.dwFlags=DSBCAPS_GLOBALFOCUS|DSBCAPS_GETCURRENTPOSITION2;
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DSBDescription.dwBufferBytes=device->UpdateFreq * device->FrameSize;
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DSBDescription.lpwfxFormat=&OutputType;
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hr = IDirectSound_CreateSoundBuffer(pData->lpDS, &DSBDescription, &pData->DSsbuffer, NULL);
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}
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if(SUCCEEDED(hr))
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hr = IDirectSoundBuffer_Play(pData->DSsbuffer, 0, 0, DSBPLAY_LOOPING);
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if(FAILED(hr))
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{
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if (pData->DSsbuffer)
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IDirectSoundBuffer_Release(pData->DSsbuffer);
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if (pData->DSpbuffer)
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IDirectSoundBuffer_Release(pData->DSpbuffer);
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if (pData->lpDS)
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IDirectSound_Release(pData->lpDS);
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free(pData);
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return ALC_FALSE;
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}
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pData->ulDSTimerID = timeSetEvent(25, 0, (LPTIMECALLBACK)DirectSoundProc, (DWORD)device, (UINT)TIME_CALLBACK_FUNCTION|TIME_PERIODIC);
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device->MaxNoOfSources = 256;
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device->ExtraData = pData;
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return ALC_TRUE;
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}
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static void DSoundClosePlayback(ALCdevice *device)
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{
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DSoundData *pData = device->ExtraData;
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// Stop and release the DS timer
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if (pData->ulDSTimerID)
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timeKillEvent(pData->ulDSTimerID);
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// Wait ... just in case any timer events happen
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Sleep(100);
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SuspendContext(NULL);
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if (pData->DSsbuffer)
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IDirectSoundBuffer_Release(pData->DSsbuffer);
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if (pData->DSpbuffer)
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IDirectSoundBuffer_Release(pData->DSpbuffer);
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IDirectSound_Release(pData->lpDS);
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//Deinit COM
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CoUninitialize();
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ProcessContext(NULL);
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free(pData);
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device->ExtraData = NULL;
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}
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static ALCboolean DSoundOpenCapture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
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{
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(void)pDevice;
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(void)deviceName;
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(void)frequency;
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(void)format;
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(void)SampleSize;
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return ALC_FALSE;
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}
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static void DSoundCloseCapture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void DSoundStartCapture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void DSoundStopCapture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void DSoundCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
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{
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(void)pDevice;
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(void)pBuffer;
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(void)lSamples;
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}
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static ALCuint DSoundAvailableSamples(ALCdevice *pDevice)
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{
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(void)pDevice;
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return 0;
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}
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BackendFuncs DSoundFuncs = {
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DSoundOpenPlayback,
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DSoundClosePlayback,
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DSoundOpenCapture,
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DSoundCloseCapture,
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DSoundStartCapture,
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DSoundStopCapture,
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DSoundCaptureSamples,
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DSoundAvailableSamples
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};
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void alcDSoundInit(BackendFuncs *FuncList)
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{
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*FuncList = DSoundFuncs;
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DeviceList[0] = AppendDeviceList("DirectSound Software");
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AppendAllDeviceList(DeviceList[0]);
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}
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