src/sound/win32_s.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file win32_s.cpp Handling of sound for Windows. */
   9
  10 #include "../stdafx.h"
  11 #include "../openttd.h"
  12 #include "../driver.h"
  13 #include "../mixer.h"
  14 #include "../core/alloc_func.hpp"
  15 #include "../core/bitmath_func.hpp"
  16 #include "../core/math_func.hpp"
  17 #include "win32_s.h"
  18 #include <windows.h>
  19 #include <mmsystem.h>
  20 #include "../os/windows/win32.h"
  21 #include "../thread.h"
  22
  23 #include "../safeguards.h"
  24
  25 static FSoundDriver_Win32 iFSoundDriver_Win32;
  26
  27 static HWAVEOUT _waveout;
  28 static WAVEHDR _wave_hdr[2];
  29 static int _bufsize;
  30 static HANDLE _thread;
  31 static DWORD _threadId;
  32 static HANDLE _event;
  33
  34 static void PrepareHeader(WAVEHDR *hdr)
  35 {
  36         hdr->dwBufferLength = _bufsize * 4;
  37         hdr->dwFlags = 0;
  38         hdr->lpData = MallocT<char>(_bufsize * 4);
  39         if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
  40 }
  41
  42 static DWORD WINAPI SoundThread(LPVOID arg)
  43 {
  44         SetCurrentThreadName("ottd:win-sound");
  45
  46         do {
  47                 for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
  48                         if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
  49                         MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
  50                         if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) {
  51                                 MessageBox(nullptr, _T("Sounds are disabled until restart."), _T("waveOutWrite failed"), MB_ICONINFORMATION);
  52                                 return 0;
  53                         }
  54                 }
  55                 WaitForSingleObject(_event, INFINITE);
  56         } while (_waveout != nullptr);
  57
  58         return 0;
  59 }
  60
  61 const char *SoundDriver_Win32::Start(const char * const *parm)
  62 {
  63         WAVEFORMATEX wfex;
  64         wfex.wFormatTag = WAVE_FORMAT_PCM;
  65         wfex.nChannels = 2;
  66         wfex.wBitsPerSample = 16;
  67         wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
  68         wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
  69         wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
  70
  71         /* Limit buffer size to prevent overflows. */
  72         _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
  73         _bufsize = min(_bufsize, UINT16_MAX);
  74
  75         try {
  76                 if (nullptr == (_event = CreateEvent(nullptr, FALSE, FALSE, nullptr))) throw "Failed to create event";
  77
  78                 if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
  79
  80                 MxInitialize(wfex.nSamplesPerSec);
  81
  82                 PrepareHeader(&_wave_hdr[0]);
  83                 PrepareHeader(&_wave_hdr[1]);
  84
  85                 if (nullptr == (_thread = CreateThread(nullptr, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
  86         } catch (const char *error) {
  87                 this->Stop();
  88                 return error;
  89         }
  90
  91         return nullptr;
  92 }
  93
  94 void SoundDriver_Win32::Stop()
  95 {
  96         HWAVEOUT waveout = _waveout;
  97
  98         /* Stop the sound thread. */
  99         _waveout = nullptr;
 100         SetEvent(_event);
 101         WaitForSingleObject(_thread, INFINITE);
 102
 103         /* Close the sound device. */
 104         waveOutReset(waveout);
 105         waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
 106         waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
 107         waveOutClose(waveout);
 108
 109         CloseHandle(_thread);
 110         CloseHandle(_event);
 111 }