Alc/winmm.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <memory.h>
  24
  25 #include <windows.h>
  26 #include <mmsystem.h>
  27
  28 #include "alMain.h"
  29 #include "AL/al.h"
  30 #include "AL/alc.h"
  31
  32
  33 typedef struct {
  34     // MMSYSTEM Capture Device
  35     ALboolean        bWaveInShutdown;
  36     HANDLE           hWaveInHdrEvent;
  37     HANDLE           hWaveInThreadEvent;
  38     HANDLE           hWaveInThread;
  39     DWORD            ulWaveInThreadID;
  40     ALint            lWaveInBuffersCommitted;
  41     HWAVEIN          hWaveInHandle;
  42     WAVEHDR          WaveInBuffer[4];
  43     ALCchar          *pCapturedSampleData;
  44     ALuint           ulCapturedDataSize;
  45     ALuint           ulReadCapturedDataPos;
  46     ALuint           ulWriteCapturedDataPos;
  47 } WinMMData;
  48
  49
  50 static ALCchar *CaptureDeviceList[16];
  51
  52 /*
  53     WaveInProc
  54
  55     Posts a message to 'CaptureThreadProc' everytime a WaveIn Buffer is completed and
  56     returns to the application (with more data)
  57 */
  58 static void CALLBACK WaveInProc(HWAVEIN hDevice,UINT uMsg,DWORD_PTR dwInstance,DWORD_PTR dwParam1,DWORD_PTR dwParam2)
  59 {
  60     ALCdevice *pDevice = (ALCdevice *)dwInstance;
  61     WinMMData *pData = pDevice->ExtraData;
  62
  63     (void)hDevice;
  64     (void)dwParam2;
  65
  66     if ((uMsg==WIM_DATA) && (pDevice))
  67     {
  68         // Decrement number of buffers in use
  69         pData->lWaveInBuffersCommitted--;
  70
  71         if (pData->bWaveInShutdown == AL_FALSE)
  72         {
  73             // Notify Wave Processor Thread that a Wave Header has returned
  74             PostThreadMessage(pData->ulWaveInThreadID,uMsg,0,dwParam1);
  75         }
  76         else
  77         {
  78             if (pData->lWaveInBuffersCommitted == 0)
  79             {
  80                 // Signal Wave Buffers Returned event
  81                 if (pData->hWaveInHdrEvent)
  82                     SetEvent(pData->hWaveInHdrEvent);
  83
  84                 // Post 'Quit' Message to WaveIn Processor Thread
  85                 PostThreadMessage(pData->ulWaveInThreadID,WM_QUIT,0,0);
  86             }
  87         }
  88     }
  89 }
  90
  91 /*
  92     CaptureThreadProc
  93
  94     Used by "MMSYSTEM" Device.  Called when a WaveIn buffer had been filled with new
  95     audio data.
  96 */
  97 DWORD WINAPI CaptureThreadProc(LPVOID lpParameter)
  98 {
  99     ALCdevice *pDevice = (ALCdevice*)lpParameter;
 100     WinMMData *pData = pDevice->ExtraData;
 101     ALuint ulOffset, ulMaxSize, ulSection;
 102     LPWAVEHDR pWaveHdr;
 103     MSG msg;
 104
 105     while (GetMessage(&msg, NULL, 0, 0))
 106     {
 107         if ((msg.message==WIM_DATA)&&(!pData->bWaveInShutdown))
 108         {
 109             SuspendContext(NULL);
 110
 111             pWaveHdr = ((LPWAVEHDR)msg.lParam);
 112
 113             // Calculate offset in local buffer to write data to
 114             ulOffset = pData->ulWriteCapturedDataPos % pData->ulCapturedDataSize;
 115
 116             if ((ulOffset + pWaveHdr->dwBytesRecorded) > pData->ulCapturedDataSize)
 117             {
 118                 ulSection = pData->ulCapturedDataSize - ulOffset;
 119                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, ulSection);
 120                 memcpy(pData->pCapturedSampleData, pWaveHdr->lpData + ulSection, pWaveHdr->dwBytesRecorded - ulSection);
 121             }
 122             else
 123             {
 124                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, pWaveHdr->dwBytesRecorded);
 125             }
 126
 127             pData->ulWriteCapturedDataPos += pWaveHdr->dwBytesRecorded;
 128
 129             if (pData->ulWriteCapturedDataPos > (pData->ulReadCapturedDataPos + pData->ulCapturedDataSize))
 130             {
 131                 // Application has not read enough audio data from the capture buffer so data has been
 132                 // overwritten.  Reset ReadPosition.
 133                 pData->ulReadCapturedDataPos = pData->ulWriteCapturedDataPos - pData->ulCapturedDataSize;
 134             }
 135
 136             // To prevent an over-flow prevent the offset values from getting too large
 137             ulMaxSize = pData->ulCapturedDataSize << 4;
 138             if ((pData->ulReadCapturedDataPos > ulMaxSize) && (pData->ulWriteCapturedDataPos > ulMaxSize))
 139             {
 140                 pData->ulReadCapturedDataPos -= ulMaxSize;
 141                 pData->ulWriteCapturedDataPos -= ulMaxSize;
 142             }
 143
 144             // Send buffer back to capture more data
 145             waveInAddBuffer(pData->hWaveInHandle,pWaveHdr,sizeof(WAVEHDR));
 146             pData->lWaveInBuffersCommitted++;
 147
 148             ProcessContext(NULL);
 149         }
 150     }
 151
 152     // Signal Wave Thread completed event
 153     if (pData->hWaveInThreadEvent)
 154         SetEvent(pData->hWaveInThreadEvent);
 155
 156     ExitThread(0);
 157
 158     return 0;
 159 }
 160
 161
 162 static ALCboolean WinMMOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
 163 {
 164     (void)device;
 165     (void)deviceName;
 166     return ALC_FALSE;
 167 }
 168
 169 static void WinMMClosePlayback(ALCdevice *device)
 170 {
 171     (void)device;
 172 }
 173
 174
 175 static ALCboolean WinMMOpenCapture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 176 {
 177     WAVEFORMATEX wfexCaptureFormat;
 178     WinMMData *pData = NULL;
 179     ALint lDeviceID = 0;
 180     ALint lBufferSize;
 181     ALint i;
 182
 183     (void)format;
 184
 185     // Find the Device ID matching the deviceName if valid
 186     if (deviceName)
 187     {
 188         for(i = 0;CaptureDeviceList[i];i++)
 189         {
 190             if (!strcmp(deviceName, CaptureDeviceList[i]))
 191             {
 192                 lDeviceID = i;
 193                 break;
 194             }
 195         }
 196         if(!CaptureDeviceList[i])
 197             return ALC_FALSE;
 198     }
 199     pDevice->szDeviceName = CaptureDeviceList[lDeviceID];
 200
 201     pData = calloc(1, sizeof(*pData));
 202     if(!pData)
 203     {
 204         SetALCError(ALC_OUT_OF_MEMORY);
 205         return ALC_FALSE;
 206     }
 207
 208     memset(&wfexCaptureFormat, 0, sizeof(WAVEFORMATEX));
 209     wfexCaptureFormat.wFormatTag = WAVE_FORMAT_PCM;
 210     wfexCaptureFormat.nChannels = pDevice->Channels;
 211     wfexCaptureFormat.wBitsPerSample = pDevice->FrameSize / pDevice->Channels * 8;
 212     wfexCaptureFormat.nBlockAlign = pDevice->FrameSize;
 213     wfexCaptureFormat.nSamplesPerSec = frequency;
 214     wfexCaptureFormat.nAvgBytesPerSec = wfexCaptureFormat.nSamplesPerSec *
 215                                         pDevice->FrameSize;
 216     wfexCaptureFormat.cbSize = 0;
 217
 218     if (waveInOpen(&pData->hWaveInHandle, lDeviceID, &wfexCaptureFormat, (DWORD_PTR)&WaveInProc, (DWORD_PTR)pDevice, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
 219         goto failure;
 220
 221     pData->hWaveInHdrEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInAllHeadersReturned");
 222     if (pData->hWaveInHdrEvent == NULL)
 223         goto failure;
 224
 225     pData->hWaveInThreadEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInThreadDestroyed");
 226     if (pData->hWaveInThreadEvent == NULL)
 227         goto failure;
 228
 229     pData->hWaveInThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)CaptureThreadProc, (LPVOID)pDevice, 0, &pData->ulWaveInThreadID);
 230     if (pData->hWaveInThread == NULL)
 231         goto failure;
 232
 233     // Allocate circular memory buffer for the captured audio
 234     pData->ulCapturedDataSize = SampleSize * wfexCaptureFormat.nBlockAlign;
 235
 236     // Make sure circular buffer is at least 100ms in size (and an exact multiple of
 237     // the block alignment
 238     if (pData->ulCapturedDataSize < (wfexCaptureFormat.nAvgBytesPerSec / 10))
 239     {
 240         pData->ulCapturedDataSize = wfexCaptureFormat.nAvgBytesPerSec / 10;
 241         pData->ulCapturedDataSize -= (pData->ulCapturedDataSize % wfexCaptureFormat.nBlockAlign);
 242     }
 243
 244     pData->pCapturedSampleData = (ALCchar*)malloc(pData->ulCapturedDataSize);
 245     pData->lWaveInBuffersCommitted=0;
 246
 247     // Create 4 Buffers of 50ms each
 248     lBufferSize = wfexCaptureFormat.nAvgBytesPerSec / 20;
 249     lBufferSize -= (lBufferSize % wfexCaptureFormat.nBlockAlign);
 250
 251     for (i=0;i<4;i++)
 252     {
 253         memset(&pData->WaveInBuffer[i], 0, sizeof(WAVEHDR));
 254         pData->WaveInBuffer[i].dwBufferLength = lBufferSize;
 255         pData->WaveInBuffer[i].lpData = calloc(1,pData->WaveInBuffer[i].dwBufferLength);
 256         pData->WaveInBuffer[i].dwFlags = 0;
 257         pData->WaveInBuffer[i].dwLoops = 0;
 258         waveInPrepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 259         waveInAddBuffer(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 260         pData->lWaveInBuffersCommitted++;
 261     }
 262
 263     pData->ulReadCapturedDataPos = 0;
 264     pData->ulWriteCapturedDataPos = 0;
 265
 266     pDevice->ExtraData = pData;
 267     return ALC_TRUE;
 268
 269 failure:
 270     if (pData->hWaveInThreadEvent)
 271         CloseHandle(pData->hWaveInThreadEvent);
 272     if (pData->hWaveInHdrEvent)
 273         CloseHandle(pData->hWaveInHdrEvent);
 274     if (pData->hWaveInHandle)
 275         waveInClose(pData->hWaveInHandle);
 276
 277     free(pData);
 278     return ALC_FALSE;
 279 }
 280
 281 static void WinMMCloseCapture(ALCdevice *pDevice)
 282 {
 283     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 284     int i;
 285
 286     // Call waveOutReset to shutdown wave device
 287     pData->bWaveInShutdown = AL_TRUE;
 288     waveInReset(pData->hWaveInHandle);
 289
 290     // Wait for signal that all Wave Buffers have returned
 291     WaitForSingleObjectEx(pData->hWaveInHdrEvent, 5000, FALSE);
 292
 293     // Wait for signal that Wave Thread has been destroyed
 294     WaitForSingleObjectEx(pData->hWaveInThreadEvent, 5000, FALSE);
 295
 296     // Release the wave buffers
 297     for (i=0;i<4;i++)
 298     {
 299         waveInUnprepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 300         free(pData->WaveInBuffer[i].lpData);
 301     }
 302
 303     // Free Audio Buffer data
 304     free(pData->pCapturedSampleData);
 305     pData->pCapturedSampleData = NULL;
 306
 307     // Close the Wave device
 308     waveInClose(pData->hWaveInHandle);
 309     pData->hWaveInHandle = 0;
 310
 311     CloseHandle(pData->hWaveInThread);
 312     pData->hWaveInThread = 0;
 313
 314     if (pData->hWaveInHdrEvent)
 315     {
 316         CloseHandle(pData->hWaveInHdrEvent);
 317         pData->hWaveInHdrEvent = 0;
 318     }
 319
 320     if (pData->hWaveInThreadEvent)
 321     {
 322         CloseHandle(pData->hWaveInThreadEvent);
 323         pData->hWaveInThreadEvent = 0;
 324     }
 325
 326     free(pData);
 327     pDevice->ExtraData = NULL;
 328 }
 329
 330 static void WinMMStartCapture(ALCdevice *pDevice)
 331 {
 332     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 333     waveInStart(pData->hWaveInHandle);
 334 }
 335
 336 static void WinMMStopCapture(ALCdevice *pDevice)
 337 {
 338     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 339     waveInStop(pData->hWaveInHandle);
 340 }
 341
 342 static void WinMMCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 343 {
 344     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 345     ALuint ulSamples = (unsigned long)lSamples;
 346     ALuint ulBytes, ulBytesToCopy;
 347     ALuint ulCapturedSamples;
 348     ALuint ulReadOffset;
 349
 350     // Check that we have the requested numbers of Samples
 351     ulCapturedSamples = (pData->ulWriteCapturedDataPos - pData->ulReadCapturedDataPos) / pDevice->FrameSize;
 352     if(ulSamples > ulCapturedSamples)
 353     {
 354         SetALCError(ALC_INVALID_VALUE);
 355         return;
 356     }
 357
 358     ulBytes = ulSamples * pDevice->FrameSize;
 359
 360     // Get Read Offset
 361     ulReadOffset = (pData->ulReadCapturedDataPos % pData->ulCapturedDataSize);
 362
 363     // Check for wrap-around condition
 364     if ((ulReadOffset + ulBytes) > pData->ulCapturedDataSize)
 365     {
 366         // Copy data from last Read position to end of data
 367         ulBytesToCopy = pData->ulCapturedDataSize - ulReadOffset;
 368         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytesToCopy);
 369
 370         // Copy rest of the data from the start of the captured data
 371         memcpy(((char *)pBuffer) + ulBytesToCopy, pData->pCapturedSampleData, ulBytes - ulBytesToCopy);
 372     }
 373     else
 374     {
 375         // Copy data from the read position in the captured data
 376         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytes);
 377     }
 378
 379     // Update Read Position
 380     pData->ulReadCapturedDataPos += ulBytes;
 381 }
 382
 383 static ALCuint WinMMAvailableSamples(ALCdevice *pDevice)
 384 {
 385     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 386     ALCuint lCapturedBytes = (pData->ulWriteCapturedDataPos - pData->ulReadCapturedDataPos);
 387     return lCapturedBytes / pDevice->FrameSize;
 388 }
 389
 390
 391 BackendFuncs WinMMFuncs = {
 392     WinMMOpenPlayback,
 393     WinMMClosePlayback,
 394     WinMMOpenCapture,
 395     WinMMCloseCapture,
 396     WinMMStartCapture,
 397     WinMMStopCapture,
 398     WinMMCaptureSamples,
 399     WinMMAvailableSamples
 400 };
 401
 402 void alcWinMMInit(BackendFuncs *FuncList)
 403 {
 404     ALint lNumDevs;
 405     ALint lLoop;
 406
 407     *FuncList = WinMMFuncs;
 408
 409     lNumDevs = waveInGetNumDevs();
 410     for (lLoop = 0; lLoop < lNumDevs; lLoop++)
 411     {
 412         WAVEINCAPS WaveInCaps;
 413         if(waveInGetDevCaps(lLoop, &WaveInCaps, sizeof(WAVEINCAPS)) == MMSYSERR_NOERROR)
 414         {
 415             char name[128];
 416             snprintf(name, sizeof(name), "WaveIn on %s", WaveInCaps.szPname);
 417             CaptureDeviceList[lLoop] = AppendCaptureDeviceList(name);
 418         }
 419     }
 420 }