diff options
Diffstat (limited to 'pd/portaudio/pa_win_ds/dsound_wrapper.c')
| -rw-r--r-- | pd/portaudio/pa_win_ds/dsound_wrapper.c | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/pd/portaudio/pa_win_ds/dsound_wrapper.c b/pd/portaudio/pa_win_ds/dsound_wrapper.c new file mode 100644 index 00000000..207d2873 --- /dev/null +++ b/pd/portaudio/pa_win_ds/dsound_wrapper.c @@ -0,0 +1,616 @@ +/* + * $Id: dsound_wrapper.c,v 1.1.1.1.2.11 2003/09/07 13:04:53 rossbencina Exp $ + * 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( ¤tTime ); + 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; +} + |