/* * $Id$ * pa_win_wmme.c * Implementation of PortAudio for Windows MultiMedia Extensions (WMME) * * PortAudio Portable Real-Time Audio Library * Latest Version at: http://www.portaudio.com * * Authors: Ross Bencina and Phil Burk * Copyright (c) 1999-2000 Ross Bencina and Phil Burk * * Permission is hereby granted, free of charge, to any person obtainingF * 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. * */ /* All memory allocations and frees are marked with MEM for quick review. */ /* Modification History: PLB = Phil Burk JM = Julien Maillard PLB20010402 - sDevicePtrs now allocates based on sizeof(pointer) PLB20010413 - check for excessive numbers of channels PLB20010422 - apply Mike Berry's changes for CodeWarrior on PC including condition including of memory.h, and explicit typecasting on memory allocation PLB20010802 - use GlobalAlloc for sDevicesPtr instead of PaHost_AllocFastMemory PLB20010816 - pass process instead of thread to SetPriorityClass() PLB20010927 - use number of frames instead of real-time for CPULoad calculation. JM20020118 - prevent hung thread when buffers underflow. */ #include #include #include #include #include #include /* PLB20010422 - "memory.h" doesn't work on CodeWarrior for PC. Thanks Mike Berry for the mod. */ #ifndef __MWERKS__ #include #include #endif /* __MWERKS__ */ #include "portaudio.h" #include "pa_host.h" #include "pa_trace.h" /************************************************* Constants ********/ #define PA_USE_TIMER_CALLBACK (0) /* Select between two options for background task. 0=thread, 1=timer */ #define PA_USE_HIGH_LATENCY (0) /* For debugging glitches. */ /* Switches for debugging. */ #define PA_SIMULATE_UNDERFLOW (0) /* Set to one to force an underflow of the output buffer. */ /* To trace program, enable TRACE_REALTIME_EVENTS in pa_trace.h */ #define PA_TRACE_RUN (0) #define PA_TRACE_START_STOP (1) #if PA_USE_HIGH_LATENCY #define PA_MIN_MSEC_PER_HOST_BUFFER (100) #define PA_MAX_MSEC_PER_HOST_BUFFER (300) /* Do not exceed unless user buffer exceeds */ #define PA_MIN_NUM_HOST_BUFFERS (4) #define PA_MAX_NUM_HOST_BUFFERS (16) /* OK to exceed if necessary */ #define PA_WIN_9X_LATENCY (400) #else #define PA_MIN_MSEC_PER_HOST_BUFFER (10) #define PA_MAX_MSEC_PER_HOST_BUFFER (100) /* Do not exceed unless user buffer exceeds */ #define PA_MIN_NUM_HOST_BUFFERS (3) #define PA_MAX_NUM_HOST_BUFFERS (16) /* OK to exceed if necessary */ #define PA_WIN_9X_LATENCY (200) #endif #define MIN_TIMEOUT_MSEC (1000) /* ** Use higher latency for NT because it is even worse at real-time ** operation than Win9x. */ #define PA_WIN_NT_LATENCY (PA_WIN_9X_LATENCY * 2) #if PA_SIMULATE_UNDERFLOW static gUnderCallbackCounter = 0; #define UNDER_SLEEP_AT (40) #define UNDER_SLEEP_FOR (500) #endif #define PRINT(x) { printf x; fflush(stdout); } #define ERR_RPT(x) PRINT(x) #define DBUG(x) /* PRINT(x) */ #define DBUGX(x) /* PRINT(x) */ /************************************************* Definitions ********/ /************************************************************** * Structure for internal host specific stream data. * This is allocated on a per stream basis. */ typedef struct PaHostSoundControl { /* Input -------------- */ HWAVEIN pahsc_HWaveIn; WAVEHDR *pahsc_InputBuffers; int pahsc_CurrentInputBuffer; int pahsc_BytesPerHostInputBuffer; int pahsc_BytesPerUserInputBuffer; /* native buffer size in bytes */ /* Output -------------- */ HWAVEOUT pahsc_HWaveOut; WAVEHDR *pahsc_OutputBuffers; int pahsc_CurrentOutputBuffer; int pahsc_BytesPerHostOutputBuffer; int pahsc_BytesPerUserOutputBuffer; /* native buffer size in bytes */ /* Run Time -------------- */ PaTimestamp pahsc_FramesPlayed; long pahsc_LastPosition; /* used to track frames played. */ /* For measuring CPU utilization. */ LARGE_INTEGER pahsc_EntryCount; double pahsc_InverseTicksPerHostBuffer; /* Init Time -------------- */ int pahsc_NumHostBuffers; int pahsc_FramesPerHostBuffer; int pahsc_UserBuffersPerHostBuffer; CRITICAL_SECTION pahsc_StreamLock; /* Mutext to prevent threads from colliding. */ INT pahsc_StreamLockInited; #if PA_USE_TIMER_CALLBACK BOOL pahsc_IfInsideCallback; /* Test for reentrancy. */ MMRESULT pahsc_TimerID; #else HANDLE pahsc_AbortEvent; int pahsc_AbortEventInited; HANDLE pahsc_BufferEvent; int pahsc_BufferEventInited; HANDLE pahsc_EngineThread; DWORD pahsc_EngineThreadID; #endif } PaHostSoundControl; /************************************************* Shared Data ********/ /* FIXME - put Mutex around this shared data. */ static int sNumInputDevices = 0; static int sNumOutputDevices = 0; static int sNumDevices = 0; static PaDeviceInfo **sDevicePtrs = NULL; static int sDefaultInputDeviceID = paNoDevice; static int sDefaultOutputDeviceID = paNoDevice; static int sPaHostError = 0; static const char sMapperSuffixInput[] = " - Input"; static const char sMapperSuffixOutput[] = " - Output"; /************************************************* Macros ********/ /* Convert external PA ID to an internal ID that includes WAVE_MAPPER */ #define PaDeviceIdToWinId(id) (((id) < sNumInputDevices) ? (id - 1) : (id - sNumInputDevices - 1)) /************************************************* Prototypes **********/ static Pa_QueryDevices( void ); static void CALLBACK Pa_TimerCallback(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2); PaError PaHost_GetTotalBufferFrames( internalPortAudioStream *past ); static PaError PaHost_UpdateStreamTime( PaHostSoundControl *pahsc ); static PaError PaHost_BackgroundManager( internalPortAudioStream *past ); /********************************* BEGIN CPU UTILIZATION MEASUREMENT ****/ static void Pa_StartUsageCalculation( internalPortAudioStream *past ) { PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return; /* Query system timer for usage analysis and to prevent overuse of CPU. */ QueryPerformanceCounter( &pahsc->pahsc_EntryCount ); } static void Pa_EndUsageCalculation( internalPortAudioStream *past ) { LARGE_INTEGER CurrentCount = { 0, 0 }; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return; /* ** Measure CPU utilization during this callback. Note that this calculation ** assumes that we had the processor the whole time. */ #define LOWPASS_COEFFICIENT_0 (0.9) #define LOWPASS_COEFFICIENT_1 (0.99999 - LOWPASS_COEFFICIENT_0) if( QueryPerformanceCounter( &CurrentCount ) ) { LONGLONG InsideCount = CurrentCount.QuadPart - pahsc->pahsc_EntryCount.QuadPart; double newUsage = InsideCount * pahsc->pahsc_InverseTicksPerHostBuffer; past->past_Usage = (LOWPASS_COEFFICIENT_0 * past->past_Usage) + (LOWPASS_COEFFICIENT_1 * newUsage); } } /****************************************** END CPU UTILIZATION *******/ static PaError Pa_QueryDevices( void ) { int numBytes; /* Count the devices and add one extra for the WAVE_MAPPER */ sNumInputDevices = waveInGetNumDevs() + 1; sDefaultInputDeviceID = 0; sNumOutputDevices = waveOutGetNumDevs() + 1; sDefaultOutputDeviceID = sNumInputDevices; sNumDevices = sNumInputDevices + sNumOutputDevices; /* Allocate structures to hold device info. */ /* PLB20010402 - was allocating too much memory. */ /* numBytes = sNumDevices * sizeof(PaDeviceInfo); // PLB20010402 */ numBytes = sNumDevices * sizeof(PaDeviceInfo *); /* PLB20010402 */ sDevicePtrs = (PaDeviceInfo **) GlobalAlloc( GPTR, numBytes ); /* MEM */ if( sDevicePtrs == NULL ) return paInsufficientMemory; return paNoError; } /************************************************************************************/ long Pa_GetHostError() { return sPaHostError; } /*************************************************************************/ int Pa_CountDevices() { if( sNumDevices <= 0 ) Pa_Initialize(); return sNumDevices; } /************************************************************************* ** If a PaDeviceInfo structure has not already been created, ** then allocate one and fill it in for the selected device. ** ** We create one extra input and one extra output device for the WAVE_MAPPER. ** [Does anyone know how to query the default device and get its name?] */ const PaDeviceInfo* Pa_GetDeviceInfo( PaDeviceID id ) { #define NUM_STANDARDSAMPLINGRATES 3 /* 11.025, 22.05, 44.1 */ #define NUM_CUSTOMSAMPLINGRATES 5 /* must be the same number of elements as in the array below */ #define MAX_NUMSAMPLINGRATES (NUM_STANDARDSAMPLINGRATES+NUM_CUSTOMSAMPLINGRATES) static DWORD customSamplingRates[] = { 32000, 48000, 64000, 88200, 96000 }; PaDeviceInfo *deviceInfo; double *sampleRates; /* non-const ptr */ int i; char *s; if( id < 0 || id >= sNumDevices ) return NULL; if( sDevicePtrs[ id ] != NULL ) { return sDevicePtrs[ id ]; } deviceInfo = (PaDeviceInfo *)GlobalAlloc( GPTR, sizeof(PaDeviceInfo) ); /* MEM */ if( deviceInfo == NULL ) return NULL; deviceInfo->structVersion = 1; deviceInfo->maxInputChannels = 0; deviceInfo->maxOutputChannels = 0; deviceInfo->numSampleRates = 0; sampleRates = (double*)GlobalAlloc( GPTR, MAX_NUMSAMPLINGRATES * sizeof(double) ); /* MEM */ deviceInfo->sampleRates = sampleRates; deviceInfo->nativeSampleFormats = paInt16; /* should query for higher bit depths below */ if( id < sNumInputDevices ) { /* input device */ int inputMmID = id - 1; /* WAVE_MAPPER is -1 so we start with WAVE_MAPPER */ WAVEINCAPS wic; if( waveInGetDevCaps( inputMmID, &wic, sizeof( WAVEINCAPS ) ) != MMSYSERR_NOERROR ) goto error; /* Append I/O suffix to WAVE_MAPPER device. */ if( inputMmID == WAVE_MAPPER ) { s = (char *) GlobalAlloc( GMEM_FIXED, strlen( wic.szPname ) + 1 + sizeof(sMapperSuffixInput) ); /* MEM */ strcpy( s, wic.szPname ); strcat( s, sMapperSuffixInput ); } else { s = (char *) GlobalAlloc( GMEM_FIXED, strlen( wic.szPname ) + 1 ); /* MEM */ strcpy( s, wic.szPname ); } deviceInfo->name = s; deviceInfo->maxInputChannels = wic.wChannels; /* Sometimes a device can return a rediculously large number of channels. ** This happened with an SBLive card on a Windows ME box. ** If that happens, then force it to 2 channels. PLB20010413 */ if( (deviceInfo->maxInputChannels < 1) || (deviceInfo->maxInputChannels > 256) ) { ERR_RPT(("Pa_GetDeviceInfo: Num input channels reported as %d! Changed to 2.\n", deviceInfo->maxOutputChannels )); deviceInfo->maxInputChannels = 2; } /* Add a sample rate to the list if we can do stereo 16 bit at that rate * based on the format flags. */ if( wic.dwFormats & WAVE_FORMAT_1M16 ||wic.dwFormats & WAVE_FORMAT_1S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 11025.; if( wic.dwFormats & WAVE_FORMAT_2M16 ||wic.dwFormats & WAVE_FORMAT_2S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 22050.; if( wic.dwFormats & WAVE_FORMAT_4M16 ||wic.dwFormats & WAVE_FORMAT_4S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 44100.; /* Add a sample rate to the list if we can do stereo 16 bit at that rate * based on opening the device successfully. */ for( i=0; i < NUM_CUSTOMSAMPLINGRATES; i++ ) { WAVEFORMATEX wfx; wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nSamplesPerSec = customSamplingRates[i]; wfx.wBitsPerSample = 16; wfx.cbSize = 0; /* ignored */ wfx.nChannels = (WORD)deviceInfo->maxInputChannels; wfx.nAvgBytesPerSec = wfx.nChannels * wfx.nSamplesPerSec * sizeof(short); wfx.nBlockAlign = (WORD)(wfx.nChannels * sizeof(short)); if( waveInOpen( NULL, inputMmID, &wfx, 0, 0, WAVE_FORMAT_QUERY ) == MMSYSERR_NOERROR ) { sampleRates[ deviceInfo->numSampleRates++ ] = customSamplingRates[i]; } } } else if( id - sNumInputDevices < sNumOutputDevices ) { /* output device */ int outputMmID = id - sNumInputDevices - 1; WAVEOUTCAPS woc; if( waveOutGetDevCaps( outputMmID, &woc, sizeof( WAVEOUTCAPS ) ) != MMSYSERR_NOERROR ) goto error; /* Append I/O suffix to WAVE_MAPPER device. */ if( outputMmID == WAVE_MAPPER ) { s = (char *) GlobalAlloc( GMEM_FIXED, strlen( woc.szPname ) + 1 + sizeof(sMapperSuffixOutput) ); /* MEM */ strcpy( s, woc.szPname ); strcat( s, sMapperSuffixOutput ); } else { s = (char *) GlobalAlloc( GMEM_FIXED, strlen( woc.szPname ) + 1 ); /* MEM */ strcpy( s, woc.szPname ); } deviceInfo->name = s; deviceInfo->maxOutputChannels = woc.wChannels; /* Sometimes a device can return a rediculously large number of channels. ** This happened with an SBLive card on a Windows ME box. ** If that happens, then force it to 2 channels. PLB20010413 */ if( (deviceInfo->maxOutputChannels < 1) || (deviceInfo->maxOutputChannels > 256) ) { ERR_RPT(("Pa_GetDeviceInfo: Num output channels reported as %d! Changed to 2.\n", deviceInfo->maxOutputChannels )); deviceInfo->maxOutputChannels = 2; } /* Add a sample rate to the list if we can do stereo 16 bit at that rate * based on the format flags. */ if( woc.dwFormats & WAVE_FORMAT_1M16 ||woc.dwFormats & WAVE_FORMAT_1S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 11025.; if( woc.dwFormats & WAVE_FORMAT_2M16 ||woc.dwFormats & WAVE_FORMAT_2S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 22050.; if( woc.dwFormats & WAVE_FORMAT_4M16 ||woc.dwFormats & WAVE_FORMAT_4S16 ) sampleRates[ deviceInfo->numSampleRates++ ] = 44100.; /* Add a sample rate to the list if we can do stereo 16 bit at that rate * based on opening the device successfully. */ for( i=0; i < NUM_CUSTOMSAMPLINGRATES; i++ ) { WAVEFORMATEX wfx; wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nSamplesPerSec = customSamplingRates[i]; wfx.wBitsPerSample = 16; wfx.cbSize = 0; /* ignored */ wfx.nChannels = (WORD)deviceInfo->maxOutputChannels; wfx.nAvgBytesPerSec = wfx.nChannels * wfx.nSamplesPerSec * sizeof(short); wfx.nBlockAlign = (WORD)(wfx.nChannels * sizeof(short)); if( waveOutOpen( NULL, outputMmID, &wfx, 0, 0, WAVE_FORMAT_QUERY ) == MMSYSERR_NOERROR ) { sampleRates[ deviceInfo->numSampleRates++ ] = customSamplingRates[i]; } } } sDevicePtrs[ id ] = deviceInfo; return deviceInfo; error: GlobalFree( sampleRates ); /* MEM */ GlobalFree( deviceInfo ); /* MEM */ return NULL; } /************************************************************************* ** Returns recommended device ID. ** On the PC, the recommended device can be specified by the user by ** setting an environment variable. For example, to use device #1. ** ** set PA_RECOMMENDED_OUTPUT_DEVICE=1 ** ** The user should first determine the available device ID by using ** the supplied application "pa_devs". */ #define PA_ENV_BUF_SIZE (32) #define PA_REC_IN_DEV_ENV_NAME ("PA_RECOMMENDED_INPUT_DEVICE") #define PA_REC_OUT_DEV_ENV_NAME ("PA_RECOMMENDED_OUTPUT_DEVICE") static PaDeviceID PaHost_GetEnvDefaultDeviceID( char *envName ) { DWORD hresult; char envbuf[PA_ENV_BUF_SIZE]; PaDeviceID recommendedID = paNoDevice; /* Let user determine default device by setting environment variable. */ hresult = GetEnvironmentVariable( envName, envbuf, PA_ENV_BUF_SIZE ); if( (hresult > 0) && (hresult < PA_ENV_BUF_SIZE) ) { recommendedID = atoi( envbuf ); } return recommendedID; } static PaError Pa_MaybeQueryDevices( void ) { if( sNumDevices == 0 ) { return Pa_QueryDevices(); } return 0; } /********************************************************************** ** Check for environment variable, else query devices and use result. */ PaDeviceID Pa_GetDefaultInputDeviceID( void ) { PaError result; result = PaHost_GetEnvDefaultDeviceID( PA_REC_IN_DEV_ENV_NAME ); if( result < 0 ) { result = Pa_MaybeQueryDevices(); if( result < 0 ) return result; result = sDefaultInputDeviceID; } return result; } PaDeviceID Pa_GetDefaultOutputDeviceID( void ) { PaError result; result = PaHost_GetEnvDefaultDeviceID( PA_REC_OUT_DEV_ENV_NAME ); if( result < 0 ) { result = Pa_MaybeQueryDevices(); if( result < 0 ) return result; result = sDefaultOutputDeviceID; } return result; } /********************************************************************** ** Initialize Host dependant part of API. */ PaError PaHost_Init( void ) { #if PA_SIMULATE_UNDERFLOW PRINT(("WARNING - Underflow Simulation Enabled - Expect a Big Glitch!!!\n")); #endif return Pa_MaybeQueryDevices(); } /********************************************************************** ** Check WAVE buffers to see if they are done. ** Fill any available output buffers and use any available ** input buffers by calling user callback. ** ** This routine will loop until: ** user callback returns !=0 OR ** all output buffers are filled OR ** past->past_StopSoon is set OR ** an error occurs when calling WMME. ** ** Returns >0 when user requests a stop, <0 on error. ** */ static PaError Pa_TimeSlice( internalPortAudioStream *past ) { PaError result = 0; long bytesEmpty = 0; long bytesFilled = 0; long buffersEmpty = 0; MMRESULT mresult; char *inBufPtr; char *outBufPtr; int gotInput = 0; int gotOutput = 0; int i; int buffersProcessed = 0; int done = 0; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paInternalError; past->past_NumCallbacks += 1; #if PA_TRACE_RUN AddTraceMessage("Pa_TimeSlice: past_NumCallbacks ", past->past_NumCallbacks ); #endif /* JM20020118 - prevent hung thread when buffers underflow. */ /* while( !done ) /* BAD */ while( !done && !past->past_StopSoon ) /* GOOD */ { #if PA_SIMULATE_UNDERFLOW if(gUnderCallbackCounter++ == UNDER_SLEEP_AT) { Sleep(UNDER_SLEEP_FOR); } #endif /* If we are using output, then we need an empty output buffer. */ gotOutput = 0; outBufPtr = NULL; if( past->past_NumOutputChannels > 0 ) { if((pahsc->pahsc_OutputBuffers[ pahsc->pahsc_CurrentOutputBuffer ].dwFlags & WHDR_DONE) == 0) { break; /* If none empty then bail and try again later. */ } else { outBufPtr = pahsc->pahsc_OutputBuffers[ pahsc->pahsc_CurrentOutputBuffer ].lpData; gotOutput = 1; } } /* Use an input buffer if one is available. */ gotInput = 0; inBufPtr = NULL; if( ( past->past_NumInputChannels > 0 ) && (pahsc->pahsc_InputBuffers[ pahsc->pahsc_CurrentInputBuffer ].dwFlags & WHDR_DONE) ) { inBufPtr = pahsc->pahsc_InputBuffers[ pahsc->pahsc_CurrentInputBuffer ].lpData; gotInput = 1; #if PA_TRACE_RUN AddTraceMessage("Pa_TimeSlice: got input buffer at ", (int)inBufPtr ); AddTraceMessage("Pa_TimeSlice: got input buffer # ", pahsc->pahsc_CurrentInputBuffer ); #endif } /* If we can't do anything then bail out. */ if( !gotInput && !gotOutput ) break; buffersProcessed += 1; /* Each Wave buffer contains multiple user buffers so do them all now. */ /* Base Usage on time it took to process one host buffer. */ Pa_StartUsageCalculation( past ); for( i=0; ipahsc_UserBuffersPerHostBuffer; i++ ) { if( done ) { if( gotOutput ) { /* Clear remainder of wave buffer if we are waiting for stop. */ AddTraceMessage("Pa_TimeSlice: zero rest of wave buffer ", i ); memset( outBufPtr, 0, pahsc->pahsc_BytesPerUserOutputBuffer ); } } else { /* Convert 16 bit native data to user data and call user routine. */ result = Pa_CallConvertInt16( past, (short *) inBufPtr, (short *) outBufPtr ); if( result != 0) done = 1; } if( gotInput ) inBufPtr += pahsc->pahsc_BytesPerUserInputBuffer; if( gotOutput) outBufPtr += pahsc->pahsc_BytesPerUserOutputBuffer; } Pa_EndUsageCalculation( past ); /* Send WAVE buffer to Wave Device to be refilled. */ if( gotInput ) { mresult = waveInAddBuffer( pahsc->pahsc_HWaveIn, &pahsc->pahsc_InputBuffers[ pahsc->pahsc_CurrentInputBuffer ], sizeof(WAVEHDR) ); if( mresult != MMSYSERR_NOERROR ) { sPaHostError = mresult; result = paHostError; break; } pahsc->pahsc_CurrentInputBuffer = (pahsc->pahsc_CurrentInputBuffer+1 >= pahsc->pahsc_NumHostBuffers) ? 0 : pahsc->pahsc_CurrentInputBuffer+1; } /* Write WAVE buffer to Wave Device. */ if( gotOutput ) { #if PA_TRACE_START_STOP AddTraceMessage( "Pa_TimeSlice: writing buffer ", pahsc->pahsc_CurrentOutputBuffer ); #endif mresult = waveOutWrite( pahsc->pahsc_HWaveOut, &pahsc->pahsc_OutputBuffers[ pahsc->pahsc_CurrentOutputBuffer ], sizeof(WAVEHDR) ); if( mresult != MMSYSERR_NOERROR ) { sPaHostError = mresult; result = paHostError; break; } pahsc->pahsc_CurrentOutputBuffer = (pahsc->pahsc_CurrentOutputBuffer+1 >= pahsc->pahsc_NumHostBuffers) ? 0 : pahsc->pahsc_CurrentOutputBuffer+1; } } #if PA_TRACE_RUN AddTraceMessage("Pa_TimeSlice: buffersProcessed ", buffersProcessed ); #endif return (result != 0) ? result : done; } /*******************************************************************/ static PaError PaHost_BackgroundManager( internalPortAudioStream *past ) { PaError result = 0; int i; int numQueuedOutputBuffers = 0; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; /* Has someone asked us to abort by calling Pa_AbortStream()? */ if( past->past_StopNow ) { past->past_IsActive = 0; /* Will cause thread to return. */ } /* Has someone asked us to stop by calling Pa_StopStream() * OR has a user callback returned '1' to indicate finished. */ else if( past->past_StopSoon ) { /* Poll buffer and when all have played then exit thread. */ /* Count how many output buffers are queued. */ numQueuedOutputBuffers = 0; if( past->past_NumOutputChannels > 0 ) { for( i=0; ipahsc_NumHostBuffers; i++ ) { if( !( pahsc->pahsc_OutputBuffers[ i ].dwFlags & WHDR_DONE) ) { #if PA_TRACE_START_STOP AddTraceMessage( "WinMMPa_OutputThreadProc: waiting for buffer ", i ); #endif numQueuedOutputBuffers++; } } } #if PA_TRACE_START_STOP AddTraceMessage( "WinMMPa_OutputThreadProc: numQueuedOutputBuffers ", numQueuedOutputBuffers ); #endif if( numQueuedOutputBuffers == 0 ) { past->past_IsActive = 0; /* Will cause thread to return. */ } } else { /* Process full input buffer and fill up empty output buffers. */ if( (result = Pa_TimeSlice( past )) != 0) { /* User callback has asked us to stop. */ #if PA_TRACE_START_STOP AddTraceMessage( "WinMMPa_OutputThreadProc: TimeSlice() returned ", result ); #endif past->past_StopSoon = 1; /* Request that audio play out then stop. */ result = paNoError; } } PaHost_UpdateStreamTime( pahsc ); return result; } #if PA_USE_TIMER_CALLBACK /*******************************************************************/ static void CALLBACK Pa_TimerCallback(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2) { internalPortAudioStream *past; PaHostSoundControl *pahsc; PaError result; past = (internalPortAudioStream *) dwUser; if( past == NULL ) return; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return; if( pahsc->pahsc_IfInsideCallback ) { if( pahsc->pahsc_TimerID != 0 ) { timeKillEvent(pahsc->pahsc_TimerID); /* Stop callback timer. */ pahsc->pahsc_TimerID = 0; } return; } pahsc->pahsc_IfInsideCallback = 1; /* Manage flags and audio processing. */ result = PaHost_BackgroundManager( past ); if( result != paNoError ) { past->past_IsActive = 0; } pahsc->pahsc_IfInsideCallback = 0; } #else /* PA_USE_TIMER_CALLBACK */ /*******************************************************************/ static DWORD WINAPI WinMMPa_OutputThreadProc( void *pArg ) { internalPortAudioStream *past; PaHostSoundControl *pahsc; void *inputBuffer=NULL; HANDLE events[2]; int numEvents = 0; DWORD result = 0; DWORD waitResult; DWORD numTimeouts = 0; DWORD timeOut; past = (internalPortAudioStream *) pArg; pahsc = (PaHostSoundControl *) past->past_DeviceData; #if PA_TRACE_START_STOP AddTraceMessage( "WinMMPa_OutputThreadProc: timeoutPeriod", timeoutPeriod ); AddTraceMessage( "WinMMPa_OutputThreadProc: past_NumUserBuffers", past->past_NumUserBuffers ); #endif /* Calculate timeOut as half the time it would take to play all buffers. */ timeOut = (DWORD) (500.0 * PaHost_GetTotalBufferFrames( past ) / past->past_SampleRate); /* Get event(s) ready for wait. */ events[numEvents++] = pahsc->pahsc_BufferEvent; if( pahsc->pahsc_AbortEventInited ) events[numEvents++] = pahsc->pahsc_AbortEvent; /* Stay in this thread as long as we are "active". */ while( past->past_IsActive ) { /*******************************************************************/ /******** WAIT here for an event from WMME or PA *******************/ /*******************************************************************/ waitResult = WaitForMultipleObjects( numEvents, events, FALSE, timeOut ); /* Error? */ if( waitResult == WAIT_FAILED ) { sPaHostError = GetLastError(); result = paHostError; past->past_IsActive = 0; } /* Timeout? Don't stop. Just keep polling for DONE.*/ else if( waitResult == WAIT_TIMEOUT ) { #if PA_TRACE_START_STOP AddTraceMessage( "WinMMPa_OutputThreadProc: timed out ", numQueuedOutputBuffers ); #endif numTimeouts += 1; } /* Manage flags and audio processing. */ result = PaHost_BackgroundManager( past ); if( result != paNoError ) { past->past_IsActive = 0; } } return result; } #endif /*******************************************************************/ PaError PaHost_OpenInputStream( internalPortAudioStream *past ) { MMRESULT mr; PaError result = paNoError; PaHostSoundControl *pahsc; int i; int inputMmId; int bytesPerInputFrame; WAVEFORMATEX wfx; const PaDeviceInfo *pad; pahsc = (PaHostSoundControl *) past->past_DeviceData; DBUG(("PaHost_OpenStream: deviceID = 0x%x\n", past->past_InputDeviceID)); pad = Pa_GetDeviceInfo( past->past_InputDeviceID ); if( pad == NULL ) return paInternalError; switch( pad->nativeSampleFormats ) { case paInt32: case paFloat32: bytesPerInputFrame = sizeof(float) * past->past_NumInputChannels; break; default: bytesPerInputFrame = sizeof(short) * past->past_NumInputChannels; break; } wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nChannels = (WORD) past->past_NumInputChannels; wfx.nSamplesPerSec = (DWORD) past->past_SampleRate; wfx.nAvgBytesPerSec = (DWORD)(bytesPerInputFrame * past->past_SampleRate); wfx.nBlockAlign = (WORD)bytesPerInputFrame; wfx.wBitsPerSample = (WORD)((bytesPerInputFrame/past->past_NumInputChannels) * 8); wfx.cbSize = 0; inputMmId = PaDeviceIdToWinId( past->past_InputDeviceID ); #if PA_USE_TIMER_CALLBACK mr = waveInOpen( &pahsc->pahsc_HWaveIn, inputMmId, &wfx, 0, 0, CALLBACK_NULL ); #else mr = waveInOpen( &pahsc->pahsc_HWaveIn, inputMmId, &wfx, (DWORD)pahsc->pahsc_BufferEvent, (DWORD) past, CALLBACK_EVENT ); #endif if( mr != MMSYSERR_NOERROR ) { ERR_RPT(("PortAudio: PaHost_OpenInputStream() failed!\n")); result = paHostError; sPaHostError = mr; goto error; } /* Allocate an array to hold the buffer pointers. */ pahsc->pahsc_InputBuffers = (WAVEHDR *) GlobalAlloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(WAVEHDR)*pahsc->pahsc_NumHostBuffers ); /* MEM */ if( pahsc->pahsc_InputBuffers == NULL ) { result = paInsufficientMemory; goto error; } /* Allocate each buffer. */ for( i=0; ipahsc_NumHostBuffers; i++ ) { pahsc->pahsc_InputBuffers[i].lpData = (char *)GlobalAlloc( GMEM_FIXED, pahsc->pahsc_BytesPerHostInputBuffer ); /* MEM */ if( pahsc->pahsc_InputBuffers[i].lpData == NULL ) { result = paInsufficientMemory; goto error; } pahsc->pahsc_InputBuffers[i].dwBufferLength = pahsc->pahsc_BytesPerHostInputBuffer; pahsc->pahsc_InputBuffers[i].dwUser = i; if( ( mr = waveInPrepareHeader( pahsc->pahsc_HWaveIn, &pahsc->pahsc_InputBuffers[i], sizeof(WAVEHDR) )) != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } } return result; error: return result; } /*******************************************************************/ PaError PaHost_OpenOutputStream( internalPortAudioStream *past ) { MMRESULT mr; PaError result = paNoError; PaHostSoundControl *pahsc; int i; int outputMmID; int bytesPerOutputFrame; WAVEFORMATEX wfx; const PaDeviceInfo *pad; pahsc = (PaHostSoundControl *) past->past_DeviceData; DBUG(("PaHost_OpenStream: deviceID = 0x%x\n", past->past_OutputDeviceID)); pad = Pa_GetDeviceInfo( past->past_OutputDeviceID ); if( pad == NULL ) return paInternalError; switch( pad->nativeSampleFormats ) { case paInt32: case paFloat32: bytesPerOutputFrame = sizeof(float) * past->past_NumOutputChannels; break; default: bytesPerOutputFrame = sizeof(short) * past->past_NumOutputChannels; break; } wfx.wFormatTag = WAVE_FORMAT_PCM; wfx.nChannels = (WORD) past->past_NumOutputChannels; wfx.nSamplesPerSec = (DWORD) past->past_SampleRate; wfx.nAvgBytesPerSec = (DWORD)(bytesPerOutputFrame * past->past_SampleRate); wfx.nBlockAlign = (WORD)bytesPerOutputFrame; wfx.wBitsPerSample = (WORD)((bytesPerOutputFrame/past->past_NumOutputChannels) * 8); wfx.cbSize = 0; outputMmID = PaDeviceIdToWinId( past->past_OutputDeviceID ); #if PA_USE_TIMER_CALLBACK mr = waveOutOpen( &pahsc->pahsc_HWaveOut, outputMmID, &wfx, 0, 0, CALLBACK_NULL ); #else pahsc->pahsc_AbortEvent = CreateEvent( NULL, TRUE, FALSE, NULL ); if( pahsc->pahsc_AbortEvent == NULL ) { result = paHostError; sPaHostError = GetLastError(); goto error; } pahsc->pahsc_AbortEventInited = 1; mr = waveOutOpen( &pahsc->pahsc_HWaveOut, outputMmID, &wfx, (DWORD)pahsc->pahsc_BufferEvent, (DWORD) past, CALLBACK_EVENT ); #endif if( mr != MMSYSERR_NOERROR ) { ERR_RPT(("PortAudio: PaHost_OpenOutputStream() failed!\n")); result = paHostError; sPaHostError = mr; goto error; } /* Allocate an array to hold the buffer pointers. */ pahsc->pahsc_OutputBuffers = (WAVEHDR *) GlobalAlloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(WAVEHDR)*pahsc->pahsc_NumHostBuffers ); /* MEM */ if( pahsc->pahsc_OutputBuffers == NULL ) { result = paInsufficientMemory; goto error; } /* Allocate each buffer. */ for( i=0; ipahsc_NumHostBuffers; i++ ) { pahsc->pahsc_OutputBuffers[i].lpData = (char *) GlobalAlloc( GMEM_FIXED, pahsc->pahsc_BytesPerHostOutputBuffer ); /* MEM */ if( pahsc->pahsc_OutputBuffers[i].lpData == NULL ) { result = paInsufficientMemory; goto error; } pahsc->pahsc_OutputBuffers[i].dwBufferLength = pahsc->pahsc_BytesPerHostOutputBuffer; pahsc->pahsc_OutputBuffers[i].dwUser = i; if( (mr = waveOutPrepareHeader( pahsc->pahsc_HWaveOut, &pahsc->pahsc_OutputBuffers[i], sizeof(WAVEHDR) )) != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } } return result; error: return result; } /*******************************************************************/ PaError PaHost_GetTotalBufferFrames( internalPortAudioStream *past ) { PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; return pahsc->pahsc_NumHostBuffers * pahsc->pahsc_FramesPerHostBuffer; } /******************************************************************* * Determine number of WAVE Buffers * and how many User Buffers we can put into each WAVE buffer. */ static void PaHost_CalcNumHostBuffers( internalPortAudioStream *past ) { PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; unsigned int minNumBuffers; int minFramesPerHostBuffer; int maxFramesPerHostBuffer; int minTotalFrames; int userBuffersPerHostBuffer; int framesPerHostBuffer; int numHostBuffers; /* Calculate minimum and maximum sizes based on timing and sample rate. */ minFramesPerHostBuffer = (int) (PA_MIN_MSEC_PER_HOST_BUFFER * past->past_SampleRate / 1000.0); minFramesPerHostBuffer = (minFramesPerHostBuffer + 7) & ~7; DBUG(("PaHost_CalcNumHostBuffers: minFramesPerHostBuffer = %d\n", minFramesPerHostBuffer )); maxFramesPerHostBuffer = (int) (PA_MAX_MSEC_PER_HOST_BUFFER * past->past_SampleRate / 1000.0); maxFramesPerHostBuffer = (maxFramesPerHostBuffer + 7) & ~7; DBUG(("PaHost_CalcNumHostBuffers: maxFramesPerHostBuffer = %d\n", maxFramesPerHostBuffer )); /* Determine number of user buffers based on minimum latency. */ minNumBuffers = Pa_GetMinNumBuffers( past->past_FramesPerUserBuffer, past->past_SampleRate ); past->past_NumUserBuffers = ( minNumBuffers > past->past_NumUserBuffers ) ? minNumBuffers : past->past_NumUserBuffers; DBUG(("PaHost_CalcNumHostBuffers: min past_NumUserBuffers = %d\n", past->past_NumUserBuffers )); minTotalFrames = past->past_NumUserBuffers * past->past_FramesPerUserBuffer; /* We cannot make the WAVE buffers too small because they may not get serviced quickly enough. */ if( (int) past->past_FramesPerUserBuffer < minFramesPerHostBuffer ) { userBuffersPerHostBuffer = (minFramesPerHostBuffer + past->past_FramesPerUserBuffer - 1) / past->past_FramesPerUserBuffer; } else { userBuffersPerHostBuffer = 1; } framesPerHostBuffer = past->past_FramesPerUserBuffer * userBuffersPerHostBuffer; /* Calculate number of WAVE buffers needed. Round up to cover minTotalFrames. */ numHostBuffers = (minTotalFrames + framesPerHostBuffer - 1) / framesPerHostBuffer; /* Make sure we have anough WAVE buffers. */ if( numHostBuffers < PA_MIN_NUM_HOST_BUFFERS) { numHostBuffers = PA_MIN_NUM_HOST_BUFFERS; } else if( (numHostBuffers > PA_MAX_NUM_HOST_BUFFERS) && ((int) past->past_FramesPerUserBuffer < (maxFramesPerHostBuffer/2) ) ) { /* If we have too many WAVE buffers, try to put more user buffers in a wave buffer. */ while(numHostBuffers > PA_MAX_NUM_HOST_BUFFERS) { userBuffersPerHostBuffer += 1; framesPerHostBuffer = past->past_FramesPerUserBuffer * userBuffersPerHostBuffer; numHostBuffers = (minTotalFrames + framesPerHostBuffer - 1) / framesPerHostBuffer; /* If we have gone too far, back up one. */ if( (framesPerHostBuffer > maxFramesPerHostBuffer) || (numHostBuffers < PA_MAX_NUM_HOST_BUFFERS) ) { userBuffersPerHostBuffer -= 1; framesPerHostBuffer = past->past_FramesPerUserBuffer * userBuffersPerHostBuffer; numHostBuffers = (minTotalFrames + framesPerHostBuffer - 1) / framesPerHostBuffer; break; } } } pahsc->pahsc_UserBuffersPerHostBuffer = userBuffersPerHostBuffer; pahsc->pahsc_FramesPerHostBuffer = framesPerHostBuffer; pahsc->pahsc_NumHostBuffers = numHostBuffers; DBUG(("PaHost_CalcNumHostBuffers: pahsc_UserBuffersPerHostBuffer = %d\n", pahsc->pahsc_UserBuffersPerHostBuffer )); DBUG(("PaHost_CalcNumHostBuffers: pahsc_NumHostBuffers = %d\n", pahsc->pahsc_NumHostBuffers )); DBUG(("PaHost_CalcNumHostBuffers: pahsc_FramesPerHostBuffer = %d\n", pahsc->pahsc_FramesPerHostBuffer )); DBUG(("PaHost_CalcNumHostBuffers: past_NumUserBuffers = %d\n", past->past_NumUserBuffers )); } /*******************************************************************/ PaError PaHost_OpenStream( internalPortAudioStream *past ) { PaError result = paNoError; PaHostSoundControl *pahsc; /* Allocate and initialize host data. */ pahsc = (PaHostSoundControl *) PaHost_AllocateFastMemory(sizeof(PaHostSoundControl)); /* MEM */ if( pahsc == NULL ) { result = paInsufficientMemory; goto error; } memset( pahsc, 0, sizeof(PaHostSoundControl) ); past->past_DeviceData = (void *) pahsc; /* Figure out how user buffers fit into WAVE buffers. */ PaHost_CalcNumHostBuffers( past ); { int msecLatency = (int) ((PaHost_GetTotalBufferFrames(past) * 1000) / past->past_SampleRate); DBUG(("PortAudio on WMME - Latency = %d frames, %d msec\n", PaHost_GetTotalBufferFrames(past), msecLatency )); } InitializeCriticalSection( &pahsc->pahsc_StreamLock ); pahsc->pahsc_StreamLockInited = 1; #if (PA_USE_TIMER_CALLBACK == 0) pahsc->pahsc_BufferEventInited = 0; pahsc->pahsc_BufferEvent = CreateEvent( NULL, FALSE, FALSE, NULL ); if( pahsc->pahsc_BufferEvent == NULL ) { result = paHostError; sPaHostError = GetLastError(); goto error; } pahsc->pahsc_BufferEventInited = 1; #endif /* (PA_USE_TIMER_CALLBACK == 0) */ /* ------------------ OUTPUT */ pahsc->pahsc_BytesPerUserOutputBuffer = past->past_FramesPerUserBuffer * past->past_NumOutputChannels * sizeof(short); pahsc->pahsc_BytesPerHostOutputBuffer = pahsc->pahsc_UserBuffersPerHostBuffer * pahsc->pahsc_BytesPerUserOutputBuffer; if( (past->past_OutputDeviceID != paNoDevice) && (past->past_NumOutputChannels > 0) ) { result = PaHost_OpenOutputStream( past ); if( result < 0 ) goto error; } /* ------------------ INPUT */ pahsc->pahsc_BytesPerUserInputBuffer = past->past_FramesPerUserBuffer * past->past_NumInputChannels * sizeof(short); pahsc->pahsc_BytesPerHostInputBuffer = pahsc->pahsc_UserBuffersPerHostBuffer * pahsc->pahsc_BytesPerUserInputBuffer; if( (past->past_InputDeviceID != paNoDevice) && (past->past_NumInputChannels > 0) ) { result = PaHost_OpenInputStream( past ); if( result < 0 ) goto error; } /* Calculate scalar used in CPULoad calculation. */ { LARGE_INTEGER frequency; if( QueryPerformanceFrequency( &frequency ) == 0 ) { pahsc->pahsc_InverseTicksPerHostBuffer = 0.0; } else { pahsc->pahsc_InverseTicksPerHostBuffer = past->past_SampleRate / ( (double)frequency.QuadPart * past->past_FramesPerUserBuffer * pahsc->pahsc_UserBuffersPerHostBuffer ); DBUG(("pahsc_InverseTicksPerHostBuffer = %g\n", pahsc->pahsc_InverseTicksPerHostBuffer )); } } return result; error: PaHost_CloseStream( past ); return result; } /*************************************************************************/ PaError PaHost_StartOutput( internalPortAudioStream *past ) { MMRESULT mr; PaHostSoundControl *pahsc; PaError result = paNoError; int i; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( past->past_OutputDeviceID != paNoDevice ) { if( (mr = waveOutPause( pahsc->pahsc_HWaveOut )) != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } for( i=0; ipahsc_NumHostBuffers; i++ ) { ZeroMemory( pahsc->pahsc_OutputBuffers[i].lpData, pahsc->pahsc_OutputBuffers[i].dwBufferLength ); mr = waveOutWrite( pahsc->pahsc_HWaveOut, &pahsc->pahsc_OutputBuffers[i], sizeof(WAVEHDR) ); if( mr != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } past->past_FrameCount += pahsc->pahsc_FramesPerHostBuffer; } pahsc->pahsc_CurrentOutputBuffer = 0; if( (mr = waveOutRestart( pahsc->pahsc_HWaveOut )) != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } } DBUG(("PaHost_StartOutput: DSW_StartOutput returned = 0x%X.\n", hr)); error: return result; } /*************************************************************************/ PaError PaHost_StartInput( internalPortAudioStream *past ) { PaError result = paNoError; MMRESULT mr; int i; PaHostSoundControl *pahsc; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( past->past_InputDeviceID != paNoDevice ) { for( i=0; ipahsc_NumHostBuffers; i++ ) { mr = waveInAddBuffer( pahsc->pahsc_HWaveIn, &pahsc->pahsc_InputBuffers[i], sizeof(WAVEHDR) ); if( mr != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } } pahsc->pahsc_CurrentInputBuffer = 0; mr = waveInStart( pahsc->pahsc_HWaveIn ); DBUG(("Pa_StartStream: waveInStart returned = 0x%X.\n", hr)); if( mr != MMSYSERR_NOERROR ) { result = paHostError; sPaHostError = mr; goto error; } } error: return result; } /*************************************************************************/ PaError PaHost_StartEngine( internalPortAudioStream *past ) { PaError result = paNoError; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; #if PA_USE_TIMER_CALLBACK int resolution; int bufsPerTimerCallback; int msecPerBuffer; #endif /* PA_USE_TIMER_CALLBACK */ past->past_StopSoon = 0; past->past_StopNow = 0; past->past_IsActive = 1; pahsc->pahsc_FramesPlayed = 0.0; pahsc->pahsc_LastPosition = 0; #if PA_TRACE_START_STOP AddTraceMessage( "PaHost_StartEngine: TimeSlice() returned ", result ); #endif #if PA_USE_TIMER_CALLBACK /* Create timer that will wake us up so we can fill the DSound buffer. */ bufsPerTimerCallback = pahsc->pahsc_NumHostBuffers/4; if( bufsPerTimerCallback < 1 ) bufsPerTimerCallback = 1; if( bufsPerTimerCallback < 1 ) bufsPerTimerCallback = 1; msecPerBuffer = (1000 * bufsPerTimerCallback * pahsc->pahsc_UserBuffersPerHostBuffer * past->past_FramesPerUserBuffer ) / (int) past->past_SampleRate; if( msecPerBuffer < 10 ) msecPerBuffer = 10; else if( msecPerBuffer > 100 ) msecPerBuffer = 100; resolution = msecPerBuffer/4; pahsc->pahsc_TimerID = timeSetEvent( msecPerBuffer, resolution, (LPTIMECALLBACK) Pa_TimerCallback, (DWORD) past, TIME_PERIODIC ); if( pahsc->pahsc_TimerID == 0 ) { result = paHostError; sPaHostError = GetLastError();; goto error; } #else /* PA_USE_TIMER_CALLBACK */ ResetEvent( pahsc->pahsc_AbortEvent ); /* Create thread that waits for audio buffers to be ready for processing. */ pahsc->pahsc_EngineThread = CreateThread( 0, 0, WinMMPa_OutputThreadProc, past, 0, &pahsc->pahsc_EngineThreadID ); if( pahsc->pahsc_EngineThread == NULL ) { result = paHostError; sPaHostError = GetLastError();; goto error; } #if PA_TRACE_START_STOP AddTraceMessage( "PaHost_StartEngine: thread ", (int) pahsc->pahsc_EngineThread ); #endif /* I used to pass the thread which was failing. I now pass GetCurrentProcess(). ** This fix could improve latency for some applications. It could also result in CPU ** starvation if the callback did too much processing. ** I also added result checks, so we might see more failures at initialization. ** Thanks to Alberto di Bene for spotting this. */ if( !SetPriorityClass( GetCurrentProcess(), HIGH_PRIORITY_CLASS ) ) /* PLB20010816 */ { result = paHostError; sPaHostError = GetLastError();; goto error; } if( !SetThreadPriority( pahsc->pahsc_EngineThread, THREAD_PRIORITY_HIGHEST ) ) { result = paHostError; sPaHostError = GetLastError();; goto error; } #endif error: return result; } /*************************************************************************/ PaError PaHost_StopEngine( internalPortAudioStream *past, int abort ) { int timeOut; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paNoError; /* Tell background thread to stop generating more data and to let current data play out. */ past->past_StopSoon = 1; /* If aborting, tell background thread to stop NOW! */ if( abort ) past->past_StopNow = 1; /* Calculate timeOut longer than longest time it could take to play all buffers. */ timeOut = (DWORD) (1500.0 * PaHost_GetTotalBufferFrames( past ) / past->past_SampleRate); if( timeOut < MIN_TIMEOUT_MSEC ) timeOut = MIN_TIMEOUT_MSEC; #if PA_USE_TIMER_CALLBACK if( (past->past_OutputDeviceID != paNoDevice) && past->past_IsActive && (pahsc->pahsc_TimerID != 0) ) { /* Wait for IsActive to drop. */ while( (past->past_IsActive) && (timeOut > 0) ) { Sleep(10); timeOut -= 10; } timeKillEvent(pahsc->pahsc_TimerID); /* Stop callback timer. */ pahsc->pahsc_TimerID = 0; } #else /* PA_USE_TIMER_CALLBACK */ #if PA_TRACE_START_STOP AddTraceMessage( "PaHost_StopEngine: thread ", (int) pahsc->pahsc_EngineThread ); #endif if( (past->past_OutputDeviceID != paNoDevice) && (past->past_IsActive) && (pahsc->pahsc_EngineThread != NULL) ) { DWORD got; /* Tell background thread to stop generating more data and to let current data play out. */ DBUG(("PaHost_StopEngine: waiting for background thread.\n")); got = WaitForSingleObject( pahsc->pahsc_EngineThread, timeOut ); if( got == WAIT_TIMEOUT ) { ERR_RPT(("PaHost_StopEngine: timed out while waiting for background thread to finish.\n")); return paTimedOut; } CloseHandle( pahsc->pahsc_EngineThread ); pahsc->pahsc_EngineThread = NULL; } #endif /* PA_USE_TIMER_CALLBACK */ past->past_IsActive = 0; return paNoError; } /*************************************************************************/ PaError PaHost_StopInput( internalPortAudioStream *past, int abort ) { MMRESULT mr; PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paNoError; (void) abort; if( pahsc->pahsc_HWaveIn != NULL ) { mr = waveInReset( pahsc->pahsc_HWaveIn ); if( mr != MMSYSERR_NOERROR ) { sPaHostError = mr; return paHostError; } } return paNoError; } /*************************************************************************/ PaError PaHost_StopOutput( internalPortAudioStream *past, int abort ) { MMRESULT mr; PaHostSoundControl *pahsc; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paNoError; (void) abort; #if PA_TRACE_START_STOP AddTraceMessage( "PaHost_StopOutput: pahsc_HWaveOut ", (int) pahsc->pahsc_HWaveOut ); #endif if( pahsc->pahsc_HWaveOut != NULL ) { mr = waveOutReset( pahsc->pahsc_HWaveOut ); if( mr != MMSYSERR_NOERROR ) { sPaHostError = mr; return paHostError; } } return paNoError; } /*******************************************************************/ PaError PaHost_CloseStream( internalPortAudioStream *past ) { int i; PaHostSoundControl *pahsc; if( past == NULL ) return paBadStreamPtr; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paNoError; #if PA_TRACE_START_STOP AddTraceMessage( "PaHost_CloseStream: pahsc_HWaveOut ", (int) pahsc->pahsc_HWaveOut ); #endif /* Free data and device for output. */ if( pahsc->pahsc_HWaveOut ) { if( pahsc->pahsc_OutputBuffers ) { for( i=0; ipahsc_NumHostBuffers; i++ ) { waveOutUnprepareHeader( pahsc->pahsc_HWaveOut, &pahsc->pahsc_OutputBuffers[i], sizeof(WAVEHDR) ); GlobalFree( pahsc->pahsc_OutputBuffers[i].lpData ); /* MEM */ } GlobalFree( pahsc->pahsc_OutputBuffers ); /* MEM */ } waveOutClose( pahsc->pahsc_HWaveOut ); } /* Free data and device for input. */ if( pahsc->pahsc_HWaveIn ) { if( pahsc->pahsc_InputBuffers ) { for( i=0; ipahsc_NumHostBuffers; i++ ) { waveInUnprepareHeader( pahsc->pahsc_HWaveIn, &pahsc->pahsc_InputBuffers[i], sizeof(WAVEHDR) ); GlobalFree( pahsc->pahsc_InputBuffers[i].lpData ); /* MEM */ } GlobalFree( pahsc->pahsc_InputBuffers ); /* MEM */ } waveInClose( pahsc->pahsc_HWaveIn ); } #if (PA_USE_TIMER_CALLBACK == 0) if( pahsc->pahsc_AbortEventInited ) CloseHandle( pahsc->pahsc_AbortEvent ); if( pahsc->pahsc_BufferEventInited ) CloseHandle( pahsc->pahsc_BufferEvent ); #endif if( pahsc->pahsc_StreamLockInited ) DeleteCriticalSection( &pahsc->pahsc_StreamLock ); PaHost_FreeFastMemory( pahsc, sizeof(PaHostSoundControl) ); /* MEM */ past->past_DeviceData = NULL; return paNoError; } /************************************************************************* ** Determine minimum number of buffers required for this host based ** on minimum latency. Latency can be optionally set by user by setting ** an environment variable. For example, to set latency to 200 msec, put: ** ** set PA_MIN_LATENCY_MSEC=200 ** ** in the AUTOEXEC.BAT file and reboot. ** If the environment variable is not set, then the latency will be determined ** based on the OS. Windows NT has higher latency than Win95. */ #define PA_LATENCY_ENV_NAME ("PA_MIN_LATENCY_MSEC") int Pa_GetMinNumBuffers( int framesPerBuffer, double sampleRate ) { char envbuf[PA_ENV_BUF_SIZE]; DWORD hostVersion; DWORD hresult; int minLatencyMsec = 0; double msecPerBuffer = (1000.0 * framesPerBuffer) / sampleRate; int minBuffers; /* Let user determine minimal latency by setting environment variable. */ hresult = GetEnvironmentVariable( PA_LATENCY_ENV_NAME, envbuf, PA_ENV_BUF_SIZE ); if( (hresult > 0) && (hresult < PA_ENV_BUF_SIZE) ) { minLatencyMsec = atoi( envbuf ); } else { /* Set minimal latency based on whether NT or Win95. * NT has higher latency. */ hostVersion = GetVersion(); /* High bit clear if NT */ minLatencyMsec = ( (hostVersion & 0x80000000) == 0 ) ? PA_WIN_NT_LATENCY : PA_WIN_9X_LATENCY ; #if PA_USE_HIGH_LATENCY PRINT(("PA - Minimum Latency set to %d msec!\n", minLatencyMsec )); #endif } DBUG(("PA - Minimum Latency set to %d msec!\n", minLatencyMsec )); minBuffers = (int) (1.0 + ((double)minLatencyMsec / msecPerBuffer)); if( minBuffers < 2 ) minBuffers = 2; return minBuffers; } /************************************************************************* ** Cleanup device info. */ PaError PaHost_Term( void ) { int i; if( sNumDevices > 0 ) { if( sDevicePtrs != NULL ) { for( i=0; iname ); /* MEM */ GlobalFree( (void*)sDevicePtrs[i]->sampleRates ); /* MEM */ GlobalFree( sDevicePtrs[i] ); /* MEM */ } } GlobalFree( sDevicePtrs ); /* MEM */ sDevicePtrs = NULL; } sNumDevices = 0; } return paNoError; } /*************************************************************************/ void Pa_Sleep( long msec ) { Sleep( msec ); } /************************************************************************* * Allocate memory that can be accessed in real-time. * This may need to be held in physical memory so that it is not * paged to virtual memory. * This call MUST be balanced with a call to PaHost_FreeFastMemory(). * Memory will be set to zero. */ void *PaHost_AllocateFastMemory( long numBytes ) { void *addr = GlobalAlloc( GPTR, numBytes ); /* FIXME - do we need physical memory? Use VirtualLock() */ /* MEM */ return addr; } /************************************************************************* * Free memory that could be accessed in real-time. * This call MUST be balanced with a call to PaHost_AllocateFastMemory(). */ void PaHost_FreeFastMemory( void *addr, long numBytes ) { if( addr != NULL ) GlobalFree( addr ); /* MEM */ } /***********************************************************************/ PaError PaHost_StreamActive( internalPortAudioStream *past ) { PaHostSoundControl *pahsc; if( past == NULL ) return paBadStreamPtr; pahsc = (PaHostSoundControl *) past->past_DeviceData; if( pahsc == NULL ) return paInternalError; return (PaError) past->past_IsActive; } /************************************************************************* * This must be called periodically because mmtime.u.sample * is a DWORD and can wrap and lose sync after a few hours. */ static PaError PaHost_UpdateStreamTime( PaHostSoundControl *pahsc ) { MMRESULT mr; MMTIME mmtime; mmtime.wType = TIME_SAMPLES; if( pahsc->pahsc_HWaveOut != NULL ) { mr = waveOutGetPosition( pahsc->pahsc_HWaveOut, &mmtime, sizeof(mmtime) ); } else { mr = waveInGetPosition( pahsc->pahsc_HWaveIn, &mmtime, sizeof(mmtime) ); } if( mr != MMSYSERR_NOERROR ) { sPaHostError = mr; return paHostError; } /* This data has two variables and is shared by foreground and background. */ /* So we need to make it thread safe. */ EnterCriticalSection( &pahsc->pahsc_StreamLock ); pahsc->pahsc_FramesPlayed += ((long)mmtime.u.sample) - pahsc->pahsc_LastPosition; pahsc->pahsc_LastPosition = (long)mmtime.u.sample; LeaveCriticalSection( &pahsc->pahsc_StreamLock ); return paNoError; } /*************************************************************************/ PaTimestamp Pa_StreamTime( PortAudioStream *stream ) { PaHostSoundControl *pahsc; internalPortAudioStream *past = (internalPortAudioStream *) stream; if( past == NULL ) return paBadStreamPtr; pahsc = (PaHostSoundControl *) past->past_DeviceData; PaHost_UpdateStreamTime( pahsc ); return pahsc->pahsc_FramesPlayed; }