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 "config.h"
  22
  23 #define _WIN32_WINNT 0x0500
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <memory.h>
  27
  28 #include <windows.h>
  29 #include <mmsystem.h>
  30
  31 #include "alMain.h"
  32 #include "AL/al.h"
  33 #include "AL/alc.h"
  34
  35
  36 typedef struct {
  37     // MMSYSTEM Capture Device
  38     ALboolean        bWaveInShutdown;
  39     HANDLE           hWaveInHdrEvent;
  40     HANDLE           hWaveInThreadEvent;
  41     HANDLE           hWaveInThread;
  42     DWORD            ulWaveInThreadID;
  43     ALint            lWaveInBuffersCommitted;
  44     HWAVEIN          hWaveInHandle;
  45     WAVEHDR          WaveInBuffer[4];
  46     ALCchar          *pCapturedSampleData;
  47     ALuint           ulCapturedDataSize;
  48     ALuint           ulReadCapturedDataPos;
  49     ALuint           ulWriteCapturedDataPos;
  50 } WinMMData;
  51
  52
  53 static ALCchar **CaptureDeviceList;
  54 static ALuint  NumCaptureDevices;
  55
  56 static void ProbeDevices(void)
  57 {
  58     ALuint i;
  59
  60     for(i = 0;i < NumCaptureDevices;i++)
  61         free(CaptureDeviceList[i]);
  62
  63     NumCaptureDevices = waveInGetNumDevs();
  64     CaptureDeviceList = realloc(CaptureDeviceList, sizeof(ALCchar*) * NumCaptureDevices);
  65     for(i = 0;i < NumCaptureDevices;i++)
  66     {
  67         WAVEINCAPS WaveInCaps;
  68
  69         CaptureDeviceList[i] = NULL;
  70         if(waveInGetDevCaps(i, &WaveInCaps, sizeof(WAVEINCAPS)) == MMSYSERR_NOERROR)
  71         {
  72             char name[128];
  73             snprintf(name, sizeof(name), "WaveIn on %s", WaveInCaps.szPname);
  74             CaptureDeviceList[i] = strdup(name);
  75         }
  76     }
  77 }
  78
  79 /*
  80     WaveInProc
  81
  82     Posts a message to 'CaptureThreadProc' everytime a WaveIn Buffer is completed and
  83     returns to the application (with more data)
  84 */
  85 static void CALLBACK WaveInProc(HWAVEIN hDevice,UINT uMsg,DWORD_PTR dwInstance,DWORD_PTR dwParam1,DWORD_PTR dwParam2)
  86 {
  87     ALCdevice *pDevice = (ALCdevice *)dwInstance;
  88     WinMMData *pData = pDevice->ExtraData;
  89
  90     (void)hDevice;
  91     (void)dwParam2;
  92
  93     if ((uMsg==WIM_DATA))
  94     {
  95         // Decrement number of buffers in use
  96         pData->lWaveInBuffersCommitted--;
  97
  98         if (pData->bWaveInShutdown == AL_FALSE)
  99         {
 100             // Notify Wave Processor Thread that a Wave Header has returned
 101             PostThreadMessage(pData->ulWaveInThreadID,uMsg,0,dwParam1);
 102         }
 103         else
 104         {
 105             if (pData->lWaveInBuffersCommitted == 0)
 106             {
 107                 // Signal Wave Buffers Returned event
 108                 if (pData->hWaveInHdrEvent)
 109                     SetEvent(pData->hWaveInHdrEvent);
 110
 111                 // Post 'Quit' Message to WaveIn Processor Thread
 112                 PostThreadMessage(pData->ulWaveInThreadID,WM_QUIT,0,0);
 113             }
 114         }
 115     }
 116 }
 117
 118 /*
 119     CaptureThreadProc
 120
 121     Used by "MMSYSTEM" Device.  Called when a WaveIn buffer had been filled with new
 122     audio data.
 123 */
 124 DWORD WINAPI CaptureThreadProc(LPVOID lpParameter)
 125 {
 126     ALCdevice *pDevice = (ALCdevice*)lpParameter;
 127     WinMMData *pData = pDevice->ExtraData;
 128     ALuint ulOffset, ulMaxSize, ulSection;
 129     LPWAVEHDR pWaveHdr;
 130     MSG msg;
 131
 132     while (GetMessage(&msg, NULL, 0, 0))
 133     {
 134         if ((msg.message==WIM_DATA)&&(!pData->bWaveInShutdown))
 135         {
 136             SuspendContext(NULL);
 137
 138             pWaveHdr = ((LPWAVEHDR)msg.lParam);
 139
 140             // Calculate offset in local buffer to write data to
 141             ulOffset = pData->ulWriteCapturedDataPos % pData->ulCapturedDataSize;
 142
 143             if ((ulOffset + pWaveHdr->dwBytesRecorded) > pData->ulCapturedDataSize)
 144             {
 145                 ulSection = pData->ulCapturedDataSize - ulOffset;
 146                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, ulSection);
 147                 memcpy(pData->pCapturedSampleData, pWaveHdr->lpData + ulSection, pWaveHdr->dwBytesRecorded - ulSection);
 148             }
 149             else
 150             {
 151                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, pWaveHdr->dwBytesRecorded);
 152             }
 153
 154             pData->ulWriteCapturedDataPos += pWaveHdr->dwBytesRecorded;
 155
 156             if (pData->ulWriteCapturedDataPos > (pData->ulReadCapturedDataPos + pData->ulCapturedDataSize))
 157             {
 158                 // Application has not read enough audio data from the capture buffer so data has been
 159                 // overwritten.  Reset ReadPosition.
 160                 pData->ulReadCapturedDataPos = pData->ulWriteCapturedDataPos - pData->ulCapturedDataSize;
 161             }
 162
 163             // To prevent an over-flow prevent the offset values from getting too large
 164             ulMaxSize = pData->ulCapturedDataSize << 4;
 165             if ((pData->ulReadCapturedDataPos > ulMaxSize) && (pData->ulWriteCapturedDataPos > ulMaxSize))
 166             {
 167                 pData->ulReadCapturedDataPos -= ulMaxSize;
 168                 pData->ulWriteCapturedDataPos -= ulMaxSize;
 169             }
 170
 171             // Send buffer back to capture more data
 172             waveInAddBuffer(pData->hWaveInHandle,pWaveHdr,sizeof(WAVEHDR));
 173             pData->lWaveInBuffersCommitted++;
 174
 175             ProcessContext(NULL);
 176         }
 177     }
 178
 179     // Signal Wave Thread completed event
 180     if (pData->hWaveInThreadEvent)
 181         SetEvent(pData->hWaveInThreadEvent);
 182
 183     ExitThread(0);
 184
 185     return 0;
 186 }
 187
 188
 189 static ALCboolean WinMMOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
 190 {
 191     (void)device;
 192     (void)deviceName;
 193     return ALC_FALSE;
 194 }
 195
 196 static void WinMMClosePlayback(ALCdevice *device)
 197 {
 198     (void)device;
 199 }
 200
 201
 202 static ALCboolean WinMMOpenCapture(ALCdevice *pDevice, const ALCchar *deviceName)
 203 {
 204     WAVEFORMATEX wfexCaptureFormat;
 205     WinMMData *pData = NULL;
 206     ALint lDeviceID = 0;
 207     ALint lBufferSize;
 208     ALuint i;
 209
 210     // Find the Device ID matching the deviceName if valid
 211     if(deviceName)
 212     {
 213         for(i = 0;i < NumCaptureDevices;i++)
 214         {
 215             if(CaptureDeviceList[i] &&
 216                strcmp(deviceName, CaptureDeviceList[i]) == 0)
 217             {
 218                 lDeviceID = i;
 219                 break;
 220             }
 221         }
 222     }
 223     else
 224     {
 225         for(i = 0;i < NumCaptureDevices;i++)
 226         {
 227             if(CaptureDeviceList[i])
 228             {
 229                 lDeviceID = i;
 230                 break;
 231             }
 232         }
 233     }
 234     if(i == NumCaptureDevices)
 235         return ALC_FALSE;
 236
 237     pData = calloc(1, sizeof(*pData));
 238     if(!pData)
 239     {
 240         alcSetError(pDevice, ALC_OUT_OF_MEMORY);
 241         return ALC_FALSE;
 242     }
 243
 244     memset(&wfexCaptureFormat, 0, sizeof(WAVEFORMATEX));
 245     wfexCaptureFormat.wFormatTag = WAVE_FORMAT_PCM;
 246     wfexCaptureFormat.nChannels = aluChannelsFromFormat(pDevice->Format);
 247     wfexCaptureFormat.wBitsPerSample = aluBytesFromFormat(pDevice->Format) * 8;
 248     wfexCaptureFormat.nBlockAlign = wfexCaptureFormat.wBitsPerSample *
 249                                     wfexCaptureFormat.nChannels / 8;
 250     wfexCaptureFormat.nSamplesPerSec = pDevice->Frequency;
 251     wfexCaptureFormat.nAvgBytesPerSec = wfexCaptureFormat.nSamplesPerSec *
 252                                         wfexCaptureFormat.nBlockAlign;
 253     wfexCaptureFormat.cbSize = 0;
 254
 255     if (waveInOpen(&pData->hWaveInHandle, lDeviceID, &wfexCaptureFormat, (DWORD_PTR)&WaveInProc, (DWORD_PTR)pDevice, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
 256         goto failure;
 257
 258     pData->hWaveInHdrEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInAllHeadersReturned");
 259     if (pData->hWaveInHdrEvent == NULL)
 260         goto failure;
 261
 262     pData->hWaveInThreadEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInThreadDestroyed");
 263     if (pData->hWaveInThreadEvent == NULL)
 264         goto failure;
 265
 266     // Allocate circular memory buffer for the captured audio
 267     pData->ulCapturedDataSize = pDevice->UpdateSize*pDevice->NumUpdates *
 268                                 wfexCaptureFormat.nBlockAlign;
 269
 270     // Make sure circular buffer is at least 100ms in size (and an exact multiple of
 271     // the block alignment
 272     if (pData->ulCapturedDataSize < (wfexCaptureFormat.nAvgBytesPerSec / 10))
 273     {
 274         pData->ulCapturedDataSize = wfexCaptureFormat.nAvgBytesPerSec / 10;
 275         pData->ulCapturedDataSize -= (pData->ulCapturedDataSize % wfexCaptureFormat.nBlockAlign);
 276     }
 277
 278     pData->pCapturedSampleData = (ALCchar*)malloc(pData->ulCapturedDataSize);
 279     pData->lWaveInBuffersCommitted=0;
 280
 281     // Create 4 Buffers of 50ms each
 282     lBufferSize = wfexCaptureFormat.nAvgBytesPerSec / 20;
 283     lBufferSize -= (lBufferSize % wfexCaptureFormat.nBlockAlign);
 284
 285     for (i=0;i<4;i++)
 286     {
 287         memset(&pData->WaveInBuffer[i], 0, sizeof(WAVEHDR));
 288         pData->WaveInBuffer[i].dwBufferLength = lBufferSize;
 289         pData->WaveInBuffer[i].lpData = calloc(1,pData->WaveInBuffer[i].dwBufferLength);
 290         pData->WaveInBuffer[i].dwFlags = 0;
 291         pData->WaveInBuffer[i].dwLoops = 0;
 292         waveInPrepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 293         waveInAddBuffer(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 294         pData->lWaveInBuffersCommitted++;
 295     }
 296
 297     pData->ulReadCapturedDataPos = 0;
 298     pData->ulWriteCapturedDataPos = 0;
 299
 300     pDevice->ExtraData = pData;
 301
 302     pData->hWaveInThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)CaptureThreadProc, (LPVOID)pDevice, 0, &pData->ulWaveInThreadID);
 303     if (pData->hWaveInThread == NULL)
 304         goto failure;
 305
 306     pDevice->szDeviceName = strdup(CaptureDeviceList[lDeviceID]);
 307     return ALC_TRUE;
 308
 309 failure:
 310     for (i=0;i<4;i++)
 311     {
 312         if(pData->WaveInBuffer[i].lpData)
 313         {
 314             waveInUnprepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 315             free(pData->WaveInBuffer[i].lpData);
 316         }
 317     }
 318
 319     free(pData->pCapturedSampleData);
 320     if(pData->hWaveInHandle)
 321         waveInClose(pData->hWaveInHandle);
 322     if(pData->hWaveInThread)
 323         CloseHandle(pData->hWaveInThread);
 324     if (pData->hWaveInHdrEvent)
 325         CloseHandle(pData->hWaveInHdrEvent);
 326     if (pData->hWaveInThreadEvent)
 327         CloseHandle(pData->hWaveInThreadEvent);
 328
 329     free(pData);
 330     pDevice->ExtraData = NULL;
 331     return ALC_FALSE;
 332 }
 333
 334 static void WinMMCloseCapture(ALCdevice *pDevice)
 335 {
 336     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 337     int i;
 338
 339     // Call waveOutReset to shutdown wave device
 340     pData->bWaveInShutdown = AL_TRUE;
 341     waveInReset(pData->hWaveInHandle);
 342
 343     // Wait for signal that all Wave Buffers have returned
 344     WaitForSingleObjectEx(pData->hWaveInHdrEvent, 5000, FALSE);
 345
 346     // Wait for signal that Wave Thread has been destroyed
 347     WaitForSingleObjectEx(pData->hWaveInThreadEvent, 5000, FALSE);
 348
 349     // Release the wave buffers
 350     for (i=0;i<4;i++)
 351     {
 352         waveInUnprepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 353         free(pData->WaveInBuffer[i].lpData);
 354     }
 355
 356     // Free Audio Buffer data
 357     free(pData->pCapturedSampleData);
 358     pData->pCapturedSampleData = NULL;
 359
 360     // Close the Wave device
 361     waveInClose(pData->hWaveInHandle);
 362     pData->hWaveInHandle = 0;
 363
 364     CloseHandle(pData->hWaveInThread);
 365     pData->hWaveInThread = 0;
 366
 367     if (pData->hWaveInHdrEvent)
 368     {
 369         CloseHandle(pData->hWaveInHdrEvent);
 370         pData->hWaveInHdrEvent = 0;
 371     }
 372
 373     if (pData->hWaveInThreadEvent)
 374     {
 375         CloseHandle(pData->hWaveInThreadEvent);
 376         pData->hWaveInThreadEvent = 0;
 377     }
 378
 379     free(pData);
 380     pDevice->ExtraData = NULL;
 381 }
 382
 383 static void WinMMStartCapture(ALCdevice *pDevice)
 384 {
 385     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 386     waveInStart(pData->hWaveInHandle);
 387 }
 388
 389 static void WinMMStopCapture(ALCdevice *pDevice)
 390 {
 391     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 392     waveInStop(pData->hWaveInHandle);
 393 }
 394
 395 static void WinMMCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 396 {
 397     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 398     ALuint ulSamples = (unsigned long)lSamples;
 399     ALuint ulBytes, ulBytesToCopy;
 400     ALuint ulCapturedSamples;
 401     ALuint ulReadOffset;
 402     ALuint frameSize = aluBytesFromFormat(pDevice->Format) *
 403                        aluChannelsFromFormat(pDevice->Format);
 404
 405     // Check that we have the requested numbers of Samples
 406     ulCapturedSamples = (pData->ulWriteCapturedDataPos -
 407                          pData->ulReadCapturedDataPos) /
 408                         frameSize;
 409     if(ulSamples > ulCapturedSamples)
 410     {
 411         alcSetError(pDevice, ALC_INVALID_VALUE);
 412         return;
 413     }
 414
 415     ulBytes = ulSamples * frameSize;
 416
 417     // Get Read Offset
 418     ulReadOffset = (pData->ulReadCapturedDataPos % pData->ulCapturedDataSize);
 419
 420     // Check for wrap-around condition
 421     if ((ulReadOffset + ulBytes) > pData->ulCapturedDataSize)
 422     {
 423         // Copy data from last Read position to end of data
 424         ulBytesToCopy = pData->ulCapturedDataSize - ulReadOffset;
 425         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytesToCopy);
 426
 427         // Copy rest of the data from the start of the captured data
 428         memcpy(((char *)pBuffer) + ulBytesToCopy, pData->pCapturedSampleData, ulBytes - ulBytesToCopy);
 429     }
 430     else
 431     {
 432         // Copy data from the read position in the captured data
 433         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytes);
 434     }
 435
 436     // Update Read Position
 437     pData->ulReadCapturedDataPos += ulBytes;
 438 }
 439
 440 static ALCuint WinMMAvailableSamples(ALCdevice *pDevice)
 441 {
 442     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 443     ALCuint lCapturedBytes = (pData->ulWriteCapturedDataPos - pData->ulReadCapturedDataPos);
 444     return lCapturedBytes / (aluBytesFromFormat(pDevice->Format) *
 445                              aluChannelsFromFormat(pDevice->Format));
 446 }
 447
 448
 449 BackendFuncs WinMMFuncs = {
 450     WinMMOpenPlayback,
 451     WinMMClosePlayback,
 452     NULL,
 453     NULL,
 454     WinMMOpenCapture,
 455     WinMMCloseCapture,
 456     WinMMStartCapture,
 457     WinMMStopCapture,
 458     WinMMCaptureSamples,
 459     WinMMAvailableSamples
 460 };
 461
 462 void alcWinMMInit(BackendFuncs *FuncList)
 463 {
 464     *FuncList = WinMMFuncs;
 465 }
 466
 467 void alcWinMMDeinit()
 468 {
 469     ALuint lLoop;
 470
 471     for(lLoop = 0; lLoop < NumCaptureDevices; lLoop++)
 472         free(CaptureDeviceList[lLoop]);
 473     free(CaptureDeviceList);
 474     CaptureDeviceList = NULL;
 475
 476     NumCaptureDevices = 0;
 477 }
 478
 479 void alcWinMMProbe(int type)
 480 {
 481     ALuint i;
 482
 483     if(type != CAPTURE_DEVICE_PROBE)
 484         return;
 485
 486     ProbeDevices();
 487     for(i = 0;i < NumCaptureDevices;i++)
 488     {
 489         if(CaptureDeviceList[i])
 490             AppendCaptureDeviceList(CaptureDeviceList[i]);
 491     }
 492 }