src/sound/win32_s.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file win32_s.cpp Handling of sound for Windows. */
  11
  12 #include "../stdafx.h"
  13 #include "../openttd.h"
  14 #include "../driver.h"
  15 #include "../mixer.h"
  16 #include "../core/alloc_func.hpp"
  17 #include "../core/bitmath_func.hpp"
  18 #include "../core/math_func.hpp"
  19 #include "win32_s.h"
  20 #include <windows.h>
  21 #include <mmsystem.h>
  22
  23 static FSoundDriver_Win32 iFSoundDriver_Win32;
  24
  25 static HWAVEOUT _waveout;
  26 static WAVEHDR _wave_hdr[2];
  27 static int _bufsize;
  28 static HANDLE _thread;
  29 static DWORD _threadId;
  30 static HANDLE _event;
  31
  32 static void PrepareHeader(WAVEHDR *hdr)
  33 {
  34         hdr->dwBufferLength = _bufsize * 4;
  35         hdr->dwFlags = 0;
  36         hdr->lpData = MallocT<char>(_bufsize * 4);
  37         if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
  38 }
  39
  40 static DWORD WINAPI SoundThread(LPVOID arg)
  41 {
  42         do {
  43                 for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
  44                         if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
  45                         MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
  46                         if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) {
  47                                 MessageBox(NULL, _T("Sounds are disabled until restart."), _T("waveOutWrite failed"), MB_ICONINFORMATION);
  48                                 return 0;
  49                         }
  50                 }
  51                 WaitForSingleObject(_event, INFINITE);
  52         } while (_waveout != NULL);
  53
  54         return 0;
  55 }
  56
  57 const char *SoundDriver_Win32::Start(const char * const *parm)
  58 {
  59         WAVEFORMATEX wfex;
  60         wfex.wFormatTag = WAVE_FORMAT_PCM;
  61         wfex.nChannels = 2;
  62         wfex.wBitsPerSample = 16;
  63         wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
  64         wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
  65         wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
  66
  67         /* Limit buffer size to prevent overflows. */
  68         _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
  69         _bufsize = min(_bufsize, UINT16_MAX);
  70
  71         try {
  72                 if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) throw "Failed to create event";
  73
  74                 if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
  75
  76                 MxInitialize(wfex.nSamplesPerSec);
  77
  78                 PrepareHeader(&_wave_hdr[0]);
  79                 PrepareHeader(&_wave_hdr[1]);
  80
  81                 if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
  82         } catch (char *error) {
  83                 this->Stop();
  84                 return error;
  85         }
  86
  87         return NULL;
  88 }
  89
  90 void SoundDriver_Win32::Stop()
  91 {
  92         HWAVEOUT waveout = _waveout;
  93
  94         /* Stop the sound thread. */
  95         _waveout = NULL;
  96         SetEvent(_event);
  97         WaitForSingleObject(_thread, INFINITE);
  98
  99         /* Close the sound device. */
 100         waveOutReset(waveout);
 101         waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
 102         waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
 103         waveOutClose(waveout);
 104
 105         CloseHandle(_thread);
 106         CloseHandle(_event);
 107 }