Alc/dsound.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 #include <dsound.h>
  28
  29 #include "alMain.h"
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32
  33
  34 typedef struct {
  35     // DirectSound Playback Device
  36     LPDIRECTSOUND          lpDS;
  37     LPDIRECTSOUNDBUFFER    DSpbuffer;
  38     LPDIRECTSOUNDBUFFER    DSsbuffer;
  39     MMRESULT               ulDSTimerID;
  40     DWORD                  OldWriteCursor;
  41 } DSoundData;
  42
  43
  44 static ALCchar *DeviceList[16];
  45
  46 static void CALLBACK DirectSoundProc(UINT uID,UINT uReserved,DWORD_PTR dwUser,DWORD_PTR dwReserved1,DWORD_PTR dwReserved2)
  47 {
  48     ALCdevice *pDevice = (ALCdevice *)dwUser;
  49     DSoundData *pData = pDevice->ExtraData;
  50     DWORD PlayCursor,WriteCursor;
  51     BYTE *WritePtr1,*WritePtr2;
  52     DWORD WriteCnt1,WriteCnt2;
  53     WAVEFORMATEX OutputType;
  54     DWORD BytesPlayed;
  55     DWORD BufSize;
  56     HRESULT DSRes;
  57
  58     (void)uID;
  59     (void)uReserved;
  60     (void)dwReserved1;
  61     (void)dwReserved2;
  62
  63     BufSize = pDevice->UpdateFreq * pDevice->FrameSize;
  64
  65     // Get current play and write cursors
  66     IDirectSoundBuffer_GetCurrentPosition(pData->DSsbuffer,&PlayCursor,&WriteCursor);
  67     if (!pData->OldWriteCursor) pData->OldWriteCursor=WriteCursor-PlayCursor;
  68
  69     // Get the output format and figure the number of bytes played (block aligned)
  70     IDirectSoundBuffer_GetFormat(pData->DSsbuffer,&OutputType,sizeof(WAVEFORMATEX),NULL);
  71     BytesPlayed=((((WriteCursor<pData->OldWriteCursor)?(BufSize+WriteCursor-pData->OldWriteCursor):(WriteCursor-pData->OldWriteCursor))/OutputType.nBlockAlign)*OutputType.nBlockAlign);
  72
  73     // Lock output buffer started at 40msec in front of the old write cursor (15msec in front of the actual write cursor)
  74     DSRes=IDirectSoundBuffer_Lock(pData->DSsbuffer,(pData->OldWriteCursor+(OutputType.nSamplesPerSec/25)*OutputType.nBlockAlign)%BufSize,BytesPlayed,(LPVOID*)&WritePtr1,&WriteCnt1,(LPVOID*)&WritePtr2,&WriteCnt2,0);
  75
  76     // If the buffer is lost, restore it, play and lock
  77     if (DSRes==DSERR_BUFFERLOST)
  78     {
  79         IDirectSoundBuffer_Restore(pData->DSsbuffer);
  80         IDirectSoundBuffer_Play(pData->DSsbuffer,0,0,DSBPLAY_LOOPING);
  81         DSRes=IDirectSoundBuffer_Lock(pData->DSsbuffer,(pData->OldWriteCursor+(OutputType.nSamplesPerSec/25)*OutputType.nBlockAlign)%BufSize,BytesPlayed,(LPVOID*)&WritePtr1,&WriteCnt1,(LPVOID*)&WritePtr2,&WriteCnt2,0);
  82     }
  83
  84     // Successfully locked the output buffer
  85     if (DSRes==DS_OK)
  86     {
  87         // If we have an active context, mix data directly into output buffer otherwise fill with silence
  88         SuspendContext(NULL);
  89         if (WritePtr1)
  90             aluMixData(pDevice->Context, WritePtr1, WriteCnt1, pDevice->Format);
  91         if (WritePtr2)
  92             aluMixData(pDevice->Context, WritePtr2, WriteCnt2, pDevice->Format);
  93         ProcessContext(NULL);
  94
  95         // Unlock output buffer only when successfully locked
  96         IDirectSoundBuffer_Unlock(pData->DSsbuffer,WritePtr1,WriteCnt1,WritePtr2,WriteCnt2);
  97     }
  98
  99     // Update old write cursor location
 100     pData->OldWriteCursor=((pData->OldWriteCursor+BytesPlayed)%BufSize);
 101 }
 102
 103
 104 static ALCboolean DSoundOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
 105 {
 106     DSBUFFERDESC DSBDescription;
 107     DSoundData *pData = NULL;
 108     WAVEFORMATEX OutputType;
 109     HRESULT hr;
 110
 111     if(deviceName)
 112     {
 113         int i;
 114         for(i = 0;DeviceList[i];i++)
 115         {
 116             if(strcmp(deviceName, DeviceList[i]) == 0)
 117             {
 118                 device->szDeviceName = DeviceList[i];
 119                 break;
 120             }
 121         }
 122         if(!DeviceList[i])
 123             return ALC_FALSE;
 124     }
 125     else
 126         device->szDeviceName = DeviceList[0];
 127
 128     //Platform specific
 129     memset(&OutputType, 0, sizeof(WAVEFORMATEX));
 130     OutputType.wFormatTag = WAVE_FORMAT_PCM;
 131     OutputType.nChannels = device->Channels;
 132     OutputType.wBitsPerSample = aluBytesFromFormat(device->Format) * 8;
 133     OutputType.nBlockAlign = OutputType.nChannels*OutputType.wBitsPerSample/8;
 134     OutputType.nSamplesPerSec = device->Frequency;
 135     OutputType.nAvgBytesPerSec = OutputType.nSamplesPerSec*OutputType.nBlockAlign;
 136     OutputType.cbSize = 0;
 137
 138     //Initialise requested device
 139
 140     pData = calloc(1, sizeof(DSoundData));
 141     if(!pData)
 142     {
 143         SetALCError(ALC_OUT_OF_MEMORY);
 144         return ALC_FALSE;
 145     }
 146
 147     //Init COM
 148     CoInitialize(NULL);
 149
 150     //DirectSound Init code
 151     hr = CoCreateInstance(&CLSID_DirectSound, NULL, CLSCTX_INPROC_SERVER, &IID_IDirectSound, (LPVOID*)&pData->lpDS);
 152     if(SUCCEEDED(hr))
 153         hr = IDirectSound_Initialize(pData->lpDS, NULL);
 154     if(SUCCEEDED(hr))
 155         hr = IDirectSound_SetCooperativeLevel(pData->lpDS, GetForegroundWindow(), DSSCL_PRIORITY);
 156
 157     if(SUCCEEDED(hr))
 158     {
 159         memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
 160         DSBDescription.dwSize=sizeof(DSBUFFERDESC);
 161         DSBDescription.dwFlags=DSBCAPS_PRIMARYBUFFER;
 162         hr = IDirectSound_CreateSoundBuffer(pData->lpDS, &DSBDescription, &pData->DSpbuffer, NULL);
 163     }
 164     if(SUCCEEDED(hr))
 165         hr = IDirectSoundBuffer_SetFormat(pData->DSpbuffer,&OutputType);
 166
 167     if(SUCCEEDED(hr))
 168     {
 169         memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
 170         DSBDescription.dwSize=sizeof(DSBUFFERDESC);
 171         DSBDescription.dwFlags=DSBCAPS_GLOBALFOCUS|DSBCAPS_GETCURRENTPOSITION2;
 172         DSBDescription.dwBufferBytes=device->UpdateFreq * device->FrameSize;
 173         DSBDescription.lpwfxFormat=&OutputType;
 174         hr = IDirectSound_CreateSoundBuffer(pData->lpDS, &DSBDescription, &pData->DSsbuffer, NULL);
 175     }
 176
 177     if(SUCCEEDED(hr))
 178         hr = IDirectSoundBuffer_Play(pData->DSsbuffer, 0, 0, DSBPLAY_LOOPING);
 179
 180     if(FAILED(hr))
 181     {
 182         if (pData->DSsbuffer)
 183             IDirectSoundBuffer_Release(pData->DSsbuffer);
 184         if (pData->DSpbuffer)
 185             IDirectSoundBuffer_Release(pData->DSpbuffer);
 186         if (pData->lpDS)
 187             IDirectSound_Release(pData->lpDS);
 188
 189         free(pData);
 190         return ALC_FALSE;
 191     }
 192
 193     pData->ulDSTimerID = timeSetEvent(25, 0, (LPTIMECALLBACK)DirectSoundProc, (DWORD)device, (UINT)TIME_CALLBACK_FUNCTION|TIME_PERIODIC);
 194     device->MaxNoOfSources = 256;
 195
 196     device->ExtraData = pData;
 197     return ALC_TRUE;
 198 }
 199
 200 static void DSoundClosePlayback(ALCdevice *device)
 201 {
 202     DSoundData *pData = device->ExtraData;
 203
 204     // Stop and release the DS timer
 205     if (pData->ulDSTimerID)
 206         timeKillEvent(pData->ulDSTimerID);
 207
 208     // Wait ... just in case any timer events happen
 209     Sleep(100);
 210
 211     SuspendContext(NULL);
 212
 213     if (pData->DSsbuffer)
 214         IDirectSoundBuffer_Release(pData->DSsbuffer);
 215     if (pData->DSpbuffer)
 216         IDirectSoundBuffer_Release(pData->DSpbuffer);
 217     IDirectSound_Release(pData->lpDS);
 218
 219     //Deinit COM
 220     CoUninitialize();
 221
 222     ProcessContext(NULL);
 223
 224     free(pData);
 225     device->ExtraData = NULL;
 226 }
 227
 228
 229 static ALCboolean DSoundOpenCapture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 230 {
 231     (void)pDevice;
 232     (void)deviceName;
 233     (void)frequency;
 234     (void)format;
 235     (void)SampleSize;
 236     return ALC_FALSE;
 237 }
 238
 239 static void DSoundCloseCapture(ALCdevice *pDevice)
 240 {
 241     (void)pDevice;
 242 }
 243
 244 static void DSoundStartCapture(ALCdevice *pDevice)
 245 {
 246     (void)pDevice;
 247 }
 248
 249 static void DSoundStopCapture(ALCdevice *pDevice)
 250 {
 251     (void)pDevice;
 252 }
 253
 254 static void DSoundCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 255 {
 256     (void)pDevice;
 257     (void)pBuffer;
 258     (void)lSamples;
 259 }
 260
 261 static ALCuint DSoundAvailableSamples(ALCdevice *pDevice)
 262 {
 263     (void)pDevice;
 264     return 0;
 265 }
 266
 267
 268 BackendFuncs DSoundFuncs = {
 269     DSoundOpenPlayback,
 270     DSoundClosePlayback,
 271     DSoundOpenCapture,
 272     DSoundCloseCapture,
 273     DSoundStartCapture,
 274     DSoundStopCapture,
 275     DSoundCaptureSamples,
 276     DSoundAvailableSamples
 277 };
 278
 279 void alcDSoundInit(BackendFuncs *FuncList)
 280 {
 281     *FuncList = DSoundFuncs;
 282
 283     DeviceList[0] = AppendDeviceList("DirectSound Software");
 284     AppendAllDeviceList(DeviceList[0]);
 285 }