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WSJT-X/portaudio-v19/pa_win_ds/dsound_wrapper.c
Diane Bruce 8d353a5b3b - Import of portaudio v19 
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2006-07-06 03:57:24 +00:00

617 lines
25 KiB
C
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/*
* $Id$
* Simplified DirectSound interface.
*
* Author: Phil Burk & Robert Marsanyi
*
* PortAudio Portable Real-Time Audio Library
* For more information see: http://www.softsynth.com/portaudio/
* DirectSound Implementation
* Copyright (c) 1999-2000 Phil Burk & Robert Marsanyi
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "dsound_wrapper.h"
#include "pa_trace.h"
/*
Rather than linking with dxguid.a or using "#define INITGUID" to force a
header file to instantiate the required GUID(s), we define them directly
below.
*/
#include <initguid.h> // needed for the DEFINE_GUID macro
DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
/************************************************************************************/
DSoundEntryPoints dswDSoundEntryPoints = { 0, 0, 0, 0, 0, 0, 0 };
/************************************************************************************/
static HRESULT WINAPI DummyDirectSoundCreate(LPGUID lpcGuidDevice, LPDIRECTSOUND *ppDS, LPUNKNOWN pUnkOuter)
{
(void)lpcGuidDevice; /* unused parameter */
(void)ppDS; /* unused parameter */
(void)pUnkOuter; /* unused parameter */
return E_NOTIMPL;
}
static HRESULT WINAPI DummyDirectSoundEnumerateW(LPDSENUMCALLBACKW lpDSEnumCallback, LPVOID lpContext)
{
(void)lpDSEnumCallback; /* unused parameter */
(void)lpContext; /* unused parameter */
return E_NOTIMPL;
}
static HRESULT WINAPI DummyDirectSoundEnumerateA(LPDSENUMCALLBACKA lpDSEnumCallback, LPVOID lpContext)
{
(void)lpDSEnumCallback; /* unused parameter */
(void)lpContext; /* unused parameter */
return E_NOTIMPL;
}
static HRESULT WINAPI DummyDirectSoundCaptureCreate(LPGUID lpcGUID, LPDIRECTSOUNDCAPTURE *lplpDSC, LPUNKNOWN pUnkOuter)
{
(void)lpcGUID; /* unused parameter */
(void)lplpDSC; /* unused parameter */
(void)pUnkOuter; /* unused parameter */
return E_NOTIMPL;
}
static HRESULT WINAPI DummyDirectSoundCaptureEnumerateW(LPDSENUMCALLBACKW lpDSCEnumCallback, LPVOID lpContext)
{
(void)lpDSCEnumCallback; /* unused parameter */
(void)lpContext; /* unused parameter */
return E_NOTIMPL;
}
static HRESULT WINAPI DummyDirectSoundCaptureEnumerateA(LPDSENUMCALLBACKA lpDSCEnumCallback, LPVOID lpContext)
{
(void)lpDSCEnumCallback; /* unused parameter */
(void)lpContext; /* unused parameter */
return E_NOTIMPL;
}
/************************************************************************************/
void DSW_InitializeDSoundEntryPoints(void)
{
dswDSoundEntryPoints.hInstance_ = LoadLibrary("dsound.dll");
if( dswDSoundEntryPoints.hInstance_ != NULL )
{
dswDSoundEntryPoints.DirectSoundCreate =
(HRESULT (WINAPI *)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundCreate" );
if( dswDSoundEntryPoints.DirectSoundCreate == NULL )
dswDSoundEntryPoints.DirectSoundCreate = DummyDirectSoundCreate;
dswDSoundEntryPoints.DirectSoundEnumerateW =
(HRESULT (WINAPI *)(LPDSENUMCALLBACKW, LPVOID))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundEnumerateW" );
if( dswDSoundEntryPoints.DirectSoundEnumerateW == NULL )
dswDSoundEntryPoints.DirectSoundEnumerateW = DummyDirectSoundEnumerateW;
dswDSoundEntryPoints.DirectSoundEnumerateA =
(HRESULT (WINAPI *)(LPDSENUMCALLBACKA, LPVOID))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundEnumerateA" );
if( dswDSoundEntryPoints.DirectSoundEnumerateA == NULL )
dswDSoundEntryPoints.DirectSoundEnumerateA = DummyDirectSoundEnumerateA;
dswDSoundEntryPoints.DirectSoundCaptureCreate =
(HRESULT (WINAPI *)(LPGUID, LPDIRECTSOUNDCAPTURE *, LPUNKNOWN))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundCaptureCreate" );
if( dswDSoundEntryPoints.DirectSoundCaptureCreate == NULL )
dswDSoundEntryPoints.DirectSoundCaptureCreate = DummyDirectSoundCaptureCreate;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateW =
(HRESULT (WINAPI *)(LPDSENUMCALLBACKW, LPVOID))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundCaptureEnumerateW" );
if( dswDSoundEntryPoints.DirectSoundCaptureEnumerateW == NULL )
dswDSoundEntryPoints.DirectSoundCaptureEnumerateW = DummyDirectSoundCaptureEnumerateW;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateA =
(HRESULT (WINAPI *)(LPDSENUMCALLBACKA, LPVOID))
GetProcAddress( dswDSoundEntryPoints.hInstance_, "DirectSoundCaptureEnumerateA" );
if( dswDSoundEntryPoints.DirectSoundCaptureEnumerateA == NULL )
dswDSoundEntryPoints.DirectSoundCaptureEnumerateA = DummyDirectSoundCaptureEnumerateA;
}
else
{
/* initialize with dummy entry points to make live easy when ds isn't present */
dswDSoundEntryPoints.DirectSoundCreate = DummyDirectSoundCreate;
dswDSoundEntryPoints.DirectSoundEnumerateW = DummyDirectSoundEnumerateW;
dswDSoundEntryPoints.DirectSoundEnumerateA = DummyDirectSoundEnumerateA;
dswDSoundEntryPoints.DirectSoundCaptureCreate = DummyDirectSoundCaptureCreate;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateW = DummyDirectSoundCaptureEnumerateW;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateA = DummyDirectSoundCaptureEnumerateA;
}
}
/************************************************************************************/
void DSW_TerminateDSoundEntryPoints(void)
{
if( dswDSoundEntryPoints.hInstance_ != NULL )
{
FreeLibrary( dswDSoundEntryPoints.hInstance_ );
dswDSoundEntryPoints.hInstance_ = NULL;
/* ensure that we crash reliably if the entry points arent initialised */
dswDSoundEntryPoints.DirectSoundCreate = 0;
dswDSoundEntryPoints.DirectSoundEnumerateW = 0;
dswDSoundEntryPoints.DirectSoundEnumerateA = 0;
dswDSoundEntryPoints.DirectSoundCaptureCreate = 0;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateW = 0;
dswDSoundEntryPoints.DirectSoundCaptureEnumerateA = 0;
}
}
/************************************************************************************/
void DSW_Term( DSoundWrapper *dsw )
{
// Cleanup the sound buffers
if (dsw->dsw_OutputBuffer)
{
IDirectSoundBuffer_Stop( dsw->dsw_OutputBuffer );
IDirectSoundBuffer_Release( dsw->dsw_OutputBuffer );
dsw->dsw_OutputBuffer = NULL;
}
if (dsw->dsw_InputBuffer)
{
IDirectSoundCaptureBuffer_Stop( dsw->dsw_InputBuffer );
IDirectSoundCaptureBuffer_Release( dsw->dsw_InputBuffer );
dsw->dsw_InputBuffer = NULL;
}
if (dsw->dsw_pDirectSoundCapture)
{
IDirectSoundCapture_Release( dsw->dsw_pDirectSoundCapture );
dsw->dsw_pDirectSoundCapture = NULL;
}
if (dsw->dsw_pDirectSound)
{
IDirectSound_Release( dsw->dsw_pDirectSound );
dsw->dsw_pDirectSound = NULL;
}
}
/************************************************************************************/
HRESULT DSW_Init( DSoundWrapper *dsw )
{
memset( dsw, 0, sizeof(DSoundWrapper) );
return 0;
}
/************************************************************************************/
HRESULT DSW_InitOutputDevice( DSoundWrapper *dsw, LPGUID lpGUID )
{
// Create the DS object
HRESULT hr = dswDSoundEntryPoints.DirectSoundCreate( lpGUID, &dsw->dsw_pDirectSound, NULL );
if( hr != DS_OK ) return hr;
return hr;
}
/************************************************************************************/
HRESULT DSW_InitOutputBuffer( DSoundWrapper *dsw, unsigned long nFrameRate, WORD nChannels, int bytesPerBuffer )
{
DWORD dwDataLen;
DWORD playCursor;
HRESULT result;
LPDIRECTSOUNDBUFFER pPrimaryBuffer;
HWND hWnd;
HRESULT hr;
WAVEFORMATEX wfFormat;
DSBUFFERDESC primaryDesc;
DSBUFFERDESC secondaryDesc;
unsigned char* pDSBuffData;
LARGE_INTEGER counterFrequency;
dsw->dsw_OutputSize = bytesPerBuffer;
dsw->dsw_OutputRunning = FALSE;
dsw->dsw_OutputUnderflows = 0;
dsw->dsw_FramesWritten = 0;
dsw->dsw_BytesPerOutputFrame = nChannels * sizeof(short);
// We were using getForegroundWindow() but sometimes the ForegroundWindow may not be the
// applications's window. Also if that window is closed before the Buffer is closed
// then DirectSound can crash. (Thanks for Scott Patterson for reporting this.)
// So we will use GetDesktopWindow() which was suggested by Miller Puckette.
// hWnd = GetForegroundWindow();
//
// FIXME: The example code I have on the net creates a hidden window that
// is managed by our code - I think we should do that - one hidden
// window for the whole of Pa_DS
//
hWnd = GetDesktopWindow();
// Set cooperative level to DSSCL_EXCLUSIVE so that we can get 16 bit output, 44.1 KHz.
// Exclusize also prevents unexpected sounds from other apps during a performance.
if ((hr = IDirectSound_SetCooperativeLevel( dsw->dsw_pDirectSound,
hWnd, DSSCL_EXCLUSIVE)) != DS_OK)
{
return hr;
}
// -----------------------------------------------------------------------
// Create primary buffer and set format just so we can specify our custom format.
// Otherwise we would be stuck with the default which might be 8 bit or 22050 Hz.
// Setup the primary buffer description
ZeroMemory(&primaryDesc, sizeof(DSBUFFERDESC));
primaryDesc.dwSize = sizeof(DSBUFFERDESC);
primaryDesc.dwFlags = DSBCAPS_PRIMARYBUFFER; // all panning, mixing, etc done by synth
primaryDesc.dwBufferBytes = 0;
primaryDesc.lpwfxFormat = NULL;
// Create the buffer
if ((result = IDirectSound_CreateSoundBuffer( dsw->dsw_pDirectSound,
&primaryDesc, &pPrimaryBuffer, NULL)) != DS_OK) return result;
// Define the buffer format
wfFormat.wFormatTag = WAVE_FORMAT_PCM;
wfFormat.nChannels = nChannels;
wfFormat.nSamplesPerSec = nFrameRate;
wfFormat.wBitsPerSample = 8 * sizeof(short);
wfFormat.nBlockAlign = (WORD)(wfFormat.nChannels * (wfFormat.wBitsPerSample / 8));
wfFormat.nAvgBytesPerSec = wfFormat.nSamplesPerSec * wfFormat.nBlockAlign;
wfFormat.cbSize = 0; /* No extended format info. */
// Set the primary buffer's format
if((result = IDirectSoundBuffer_SetFormat( pPrimaryBuffer, &wfFormat)) != DS_OK) return result;
// ----------------------------------------------------------------------
// Setup the secondary buffer description
ZeroMemory(&secondaryDesc, sizeof(DSBUFFERDESC));
secondaryDesc.dwSize = sizeof(DSBUFFERDESC);
secondaryDesc.dwFlags = DSBCAPS_GLOBALFOCUS | DSBCAPS_GETCURRENTPOSITION2;
secondaryDesc.dwBufferBytes = bytesPerBuffer;
secondaryDesc.lpwfxFormat = &wfFormat;
// Create the secondary buffer
if ((result = IDirectSound_CreateSoundBuffer( dsw->dsw_pDirectSound,
&secondaryDesc, &dsw->dsw_OutputBuffer, NULL)) != DS_OK) return result;
// Lock the DS buffer
if ((result = IDirectSoundBuffer_Lock( dsw->dsw_OutputBuffer, 0, dsw->dsw_OutputSize, (LPVOID*)&pDSBuffData,
&dwDataLen, NULL, 0, 0)) != DS_OK) return result;
// Zero the DS buffer
ZeroMemory(pDSBuffData, dwDataLen);
// Unlock the DS buffer
if ((result = IDirectSoundBuffer_Unlock( dsw->dsw_OutputBuffer, pDSBuffData, dwDataLen, NULL, 0)) != DS_OK) return result;
if( QueryPerformanceFrequency( &counterFrequency ) )
{
int framesInBuffer = bytesPerBuffer / (nChannels * sizeof(short));
dsw->dsw_CounterTicksPerBuffer.QuadPart = (counterFrequency.QuadPart * framesInBuffer) / nFrameRate;
}
else
{
dsw->dsw_CounterTicksPerBuffer.QuadPart = 0;
}
// Let DSound set the starting write position because if we set it to zero, it looks like the
// buffer is full to begin with. This causes a long pause before sound starts when using large buffers.
hr = IDirectSoundBuffer_GetCurrentPosition( dsw->dsw_OutputBuffer, &playCursor, &dsw->dsw_WriteOffset );
if( hr != DS_OK )
{
return hr;
}
dsw->dsw_FramesWritten = dsw->dsw_WriteOffset / dsw->dsw_BytesPerOutputFrame;
/* printf("DSW_InitOutputBuffer: playCursor = %d, writeCursor = %d\n", playCursor, dsw->dsw_WriteOffset ); */
return DS_OK;
}
/************************************************************************************/
HRESULT DSW_StartOutput( DSoundWrapper *dsw )
{
HRESULT hr;
QueryPerformanceCounter( &dsw->dsw_LastPlayTime );
dsw->dsw_LastPlayCursor = 0;
dsw->dsw_FramesPlayed = 0;
hr = IDirectSoundBuffer_SetCurrentPosition( dsw->dsw_OutputBuffer, 0 );
if( hr != DS_OK )
{
return hr;
}
// Start the buffer playback in a loop.
if( dsw->dsw_OutputBuffer != NULL )
{
hr = IDirectSoundBuffer_Play( dsw->dsw_OutputBuffer, 0, 0, DSBPLAY_LOOPING );
if( hr != DS_OK )
{
return hr;
}
dsw->dsw_OutputRunning = TRUE;
}
return 0;
}
/************************************************************************************/
HRESULT DSW_StopOutput( DSoundWrapper *dsw )
{
// Stop the buffer playback
if( dsw->dsw_OutputBuffer != NULL )
{
dsw->dsw_OutputRunning = FALSE;
return IDirectSoundBuffer_Stop( dsw->dsw_OutputBuffer );
}
else return 0;
}
/************************************************************************************/
HRESULT DSW_QueryOutputFilled( DSoundWrapper *dsw, long *bytesFilledPtr )
{
HRESULT hr;
DWORD playCursor;
DWORD writeCursor;
long bytesFilled;
// Query to see where play position is.
// We don't need the writeCursor but sometimes DirectSound doesn't handle NULLS correctly
// so let's pass a pointer just to be safe.
hr = IDirectSoundBuffer_GetCurrentPosition( dsw->dsw_OutputBuffer, &playCursor, &writeCursor );
if( hr != DS_OK )
{
return hr;
}
bytesFilled = dsw->dsw_WriteOffset - playCursor;
if( bytesFilled < 0 ) bytesFilled += dsw->dsw_OutputSize; // unwrap offset
*bytesFilledPtr = bytesFilled;
return hr;
}
/************************************************************************************
* Determine how much space can be safely written to in DS buffer.
* Detect underflows and overflows.
* Does not allow writing into safety gap maintained by DirectSound.
*/
HRESULT DSW_QueryOutputSpace( DSoundWrapper *dsw, long *bytesEmpty )
{
HRESULT hr;
DWORD playCursor;
DWORD writeCursor;
long numBytesEmpty;
long playWriteGap;
// Query to see how much room is in buffer.
hr = IDirectSoundBuffer_GetCurrentPosition( dsw->dsw_OutputBuffer, &playCursor, &writeCursor );
if( hr != DS_OK )
{
return hr;
}
// Determine size of gap between playIndex and WriteIndex that we cannot write into.
playWriteGap = writeCursor - playCursor;
if( playWriteGap < 0 ) playWriteGap += dsw->dsw_OutputSize; // unwrap
/* DirectSound doesn't have a large enough playCursor so we cannot detect wrap-around. */
/* Attempt to detect playCursor wrap-around and correct it. */
if( dsw->dsw_OutputRunning && (dsw->dsw_CounterTicksPerBuffer.QuadPart != 0) )
{
/* How much time has elapsed since last check. */
LARGE_INTEGER currentTime;
LARGE_INTEGER elapsedTime;
long bytesPlayed;
long bytesExpected;
long buffersWrapped;
QueryPerformanceCounter( &currentTime );
elapsedTime.QuadPart = currentTime.QuadPart - dsw->dsw_LastPlayTime.QuadPart;
dsw->dsw_LastPlayTime = currentTime;
/* How many bytes does DirectSound say have been played. */
bytesPlayed = playCursor - dsw->dsw_LastPlayCursor;
if( bytesPlayed < 0 ) bytesPlayed += dsw->dsw_OutputSize; // unwrap
dsw->dsw_LastPlayCursor = playCursor;
/* Calculate how many bytes we would have expected to been played by now. */
bytesExpected = (long) ((elapsedTime.QuadPart * dsw->dsw_OutputSize) / dsw->dsw_CounterTicksPerBuffer.QuadPart);
buffersWrapped = (bytesExpected - bytesPlayed) / dsw->dsw_OutputSize;
if( buffersWrapped > 0 )
{
playCursor += (buffersWrapped * dsw->dsw_OutputSize);
bytesPlayed += (buffersWrapped * dsw->dsw_OutputSize);
}
/* Maintain frame output cursor. */
dsw->dsw_FramesPlayed += (bytesPlayed / dsw->dsw_BytesPerOutputFrame);
}
numBytesEmpty = playCursor - dsw->dsw_WriteOffset;
if( numBytesEmpty < 0 ) numBytesEmpty += dsw->dsw_OutputSize; // unwrap offset
/* Have we underflowed? */
if( numBytesEmpty > (dsw->dsw_OutputSize - playWriteGap) )
{
if( dsw->dsw_OutputRunning )
{
dsw->dsw_OutputUnderflows += 1;
}
dsw->dsw_WriteOffset = writeCursor;
numBytesEmpty = dsw->dsw_OutputSize - playWriteGap;
}
*bytesEmpty = numBytesEmpty;
return hr;
}
/************************************************************************************/
HRESULT DSW_ZeroEmptySpace( DSoundWrapper *dsw )
{
HRESULT hr;
LPBYTE lpbuf1 = NULL;
LPBYTE lpbuf2 = NULL;
DWORD dwsize1 = 0;
DWORD dwsize2 = 0;
long bytesEmpty;
hr = DSW_QueryOutputSpace( dsw, &bytesEmpty ); // updates dsw_FramesPlayed
if (hr != DS_OK) return hr;
if( bytesEmpty == 0 ) return DS_OK;
// Lock free space in the DS
hr = IDirectSoundBuffer_Lock( dsw->dsw_OutputBuffer, dsw->dsw_WriteOffset, bytesEmpty, (void **) &lpbuf1, &dwsize1,
(void **) &lpbuf2, &dwsize2, 0);
if (hr == DS_OK)
{
// Copy the buffer into the DS
ZeroMemory(lpbuf1, dwsize1);
if(lpbuf2 != NULL)
{
ZeroMemory(lpbuf2, dwsize2);
}
// Update our buffer offset and unlock sound buffer
dsw->dsw_WriteOffset = (dsw->dsw_WriteOffset + dwsize1 + dwsize2) % dsw->dsw_OutputSize;
IDirectSoundBuffer_Unlock( dsw->dsw_OutputBuffer, lpbuf1, dwsize1, lpbuf2, dwsize2);
dsw->dsw_FramesWritten += bytesEmpty / dsw->dsw_BytesPerOutputFrame;
}
return hr;
}
/************************************************************************************/
HRESULT DSW_WriteBlock( DSoundWrapper *dsw, char *buf, long numBytes )
{
HRESULT hr;
LPBYTE lpbuf1 = NULL;
LPBYTE lpbuf2 = NULL;
DWORD dwsize1 = 0;
DWORD dwsize2 = 0;
// Lock free space in the DS
hr = IDirectSoundBuffer_Lock( dsw->dsw_OutputBuffer, dsw->dsw_WriteOffset, numBytes, (void **) &lpbuf1, &dwsize1,
(void **) &lpbuf2, &dwsize2, 0);
if (hr == DS_OK)
{
// Copy the buffer into the DS
CopyMemory(lpbuf1, buf, dwsize1);
if(lpbuf2 != NULL)
{
CopyMemory(lpbuf2, buf+dwsize1, dwsize2);
}
// Update our buffer offset and unlock sound buffer
dsw->dsw_WriteOffset = (dsw->dsw_WriteOffset + dwsize1 + dwsize2) % dsw->dsw_OutputSize;
IDirectSoundBuffer_Unlock( dsw->dsw_OutputBuffer, lpbuf1, dwsize1, lpbuf2, dwsize2);
dsw->dsw_FramesWritten += numBytes / dsw->dsw_BytesPerOutputFrame;
}
return hr;
}
/************************************************************************************/
DWORD DSW_GetOutputStatus( DSoundWrapper *dsw )
{
DWORD status;
if (IDirectSoundBuffer_GetStatus( dsw->dsw_OutputBuffer, &status ) != DS_OK)
return( DSERR_INVALIDPARAM );
else
return( status );
}
/* These routines are used to support audio input.
* Do NOT compile these calls when using NT4 because it does
* not support the entry points.
*/
/************************************************************************************/
HRESULT DSW_InitInputDevice( DSoundWrapper *dsw, LPGUID lpGUID )
{
HRESULT hr = dswDSoundEntryPoints.DirectSoundCaptureCreate( lpGUID, &dsw->dsw_pDirectSoundCapture, NULL );
if( hr != DS_OK ) return hr;
return hr;
}
/************************************************************************************/
HRESULT DSW_InitInputBuffer( DSoundWrapper *dsw, unsigned long nFrameRate, WORD nChannels, int bytesPerBuffer )
{
DSCBUFFERDESC captureDesc;
WAVEFORMATEX wfFormat;
HRESULT result;
dsw->dsw_BytesPerInputFrame = nChannels * sizeof(short);
// Define the buffer format
wfFormat.wFormatTag = WAVE_FORMAT_PCM;
wfFormat.nChannels = nChannels;
wfFormat.nSamplesPerSec = nFrameRate;
wfFormat.wBitsPerSample = 8 * sizeof(short);
wfFormat.nBlockAlign = (WORD)(wfFormat.nChannels * (wfFormat.wBitsPerSample / 8));
wfFormat.nAvgBytesPerSec = wfFormat.nSamplesPerSec * wfFormat.nBlockAlign;
wfFormat.cbSize = 0; /* No extended format info. */
dsw->dsw_InputSize = bytesPerBuffer;
// ----------------------------------------------------------------------
// Setup the secondary buffer description
ZeroMemory(&captureDesc, sizeof(DSCBUFFERDESC));
captureDesc.dwSize = sizeof(DSCBUFFERDESC);
captureDesc.dwFlags = 0;
captureDesc.dwBufferBytes = bytesPerBuffer;
captureDesc.lpwfxFormat = &wfFormat;
// Create the capture buffer
if ((result = IDirectSoundCapture_CreateCaptureBuffer( dsw->dsw_pDirectSoundCapture,
&captureDesc, &dsw->dsw_InputBuffer, NULL)) != DS_OK) return result;
dsw->dsw_ReadOffset = 0; // reset last read position to start of buffer
return DS_OK;
}
/************************************************************************************/
HRESULT DSW_StartInput( DSoundWrapper *dsw )
{
// Start the buffer playback
if( dsw->dsw_InputBuffer != NULL )
{
return IDirectSoundCaptureBuffer_Start( dsw->dsw_InputBuffer, DSCBSTART_LOOPING );
}
else return 0;
}
/************************************************************************************/
HRESULT DSW_StopInput( DSoundWrapper *dsw )
{
// Stop the buffer playback
if( dsw->dsw_InputBuffer != NULL )
{
return IDirectSoundCaptureBuffer_Stop( dsw->dsw_InputBuffer );
}
else return 0;
}
/************************************************************************************/
HRESULT DSW_QueryInputFilled( DSoundWrapper *dsw, long *bytesFilled )
{
HRESULT hr;
DWORD capturePos;
DWORD readPos;
long filled;
// Query to see how much data is in buffer.
// We don't need the capture position but sometimes DirectSound doesn't handle NULLS correctly
// so let's pass a pointer just to be safe.
hr = IDirectSoundCaptureBuffer_GetCurrentPosition( dsw->dsw_InputBuffer, &capturePos, &readPos );
if( hr != DS_OK )
{
return hr;
}
filled = readPos - dsw->dsw_ReadOffset;
if( filled < 0 ) filled += dsw->dsw_InputSize; // unwrap offset
*bytesFilled = filled;
return hr;
}
/************************************************************************************/
HRESULT DSW_ReadBlock( DSoundWrapper *dsw, char *buf, long numBytes )
{
HRESULT hr;
LPBYTE lpbuf1 = NULL;
LPBYTE lpbuf2 = NULL;
DWORD dwsize1 = 0;
DWORD dwsize2 = 0;
// Lock free space in the DS
hr = IDirectSoundCaptureBuffer_Lock ( dsw->dsw_InputBuffer, dsw->dsw_ReadOffset, numBytes, (void **) &lpbuf1, &dwsize1,
(void **) &lpbuf2, &dwsize2, 0);
if (hr == DS_OK)
{
// Copy from DS to the buffer
CopyMemory( buf, lpbuf1, dwsize1);
if(lpbuf2 != NULL)
{
CopyMemory( buf+dwsize1, lpbuf2, dwsize2);
}
// Update our buffer offset and unlock sound buffer
dsw->dsw_ReadOffset = (dsw->dsw_ReadOffset + dwsize1 + dwsize2) % dsw->dsw_InputSize;
IDirectSoundCaptureBuffer_Unlock ( dsw->dsw_InputBuffer, lpbuf1, dwsize1, lpbuf2, dwsize2);
}
return hr;
}
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