win32_s.cpp

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00001 /* $Id: win32_s.cpp 22886 2011-09-03 18:56:34Z frosch $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../openttd.h"
00014 #include "../driver.h"
00015 #include "../mixer.h"
00016 #include "../core/alloc_func.hpp"
00017 #include "../core/bitmath_func.hpp"
00018 #include "../core/math_func.hpp"
00019 #include "win32_s.h"
00020 #include <windows.h>
00021 #include <mmsystem.h>
00022 
00023 static FSoundDriver_Win32 iFSoundDriver_Win32;
00024 
00025 static HWAVEOUT _waveout;
00026 static WAVEHDR _wave_hdr[2];
00027 static int _bufsize;
00028 static HANDLE _thread;
00029 static DWORD _threadId;
00030 static HANDLE _event;
00031 
00032 static void PrepareHeader(WAVEHDR *hdr)
00033 {
00034   hdr->dwBufferLength = _bufsize * 4;
00035   hdr->dwFlags = 0;
00036   hdr->lpData = MallocT<char>(_bufsize * 4);
00037   if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
00038 }
00039 
00040 static DWORD WINAPI SoundThread(LPVOID arg)
00041 {
00042   do {
00043     for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00044       if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
00045       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00046       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) {
00047         MessageBox(NULL, _T("Sounds are disabled until restart."), _T("waveOutWrite failed"), MB_ICONINFORMATION);
00048         return 0;
00049       }
00050     }
00051     WaitForSingleObject(_event, INFINITE);
00052   } while (_waveout != NULL);
00053 
00054   return 0;
00055 }
00056 
00057 const char *SoundDriver_Win32::Start(const char * const *parm)
00058 {
00059   WAVEFORMATEX wfex;
00060   wfex.wFormatTag = WAVE_FORMAT_PCM;
00061   wfex.nChannels = 2;
00062   wfex.wBitsPerSample = 16;
00063   wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
00064   wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
00065   wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
00066 
00067   /* Limit buffer size to prevent overflows. */
00068   _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
00069   _bufsize = min(_bufsize, UINT16_MAX);
00070 
00071   try {
00072     if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) throw "Failed to create event";
00073 
00074     if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
00075 
00076     MxInitialize(wfex.nSamplesPerSec);
00077 
00078     PrepareHeader(&_wave_hdr[0]);
00079     PrepareHeader(&_wave_hdr[1]);
00080 
00081     if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
00082   } catch (char *error) {
00083     this->Stop();
00084     return error;
00085   }
00086 
00087   return NULL;
00088 }
00089 
00090 void SoundDriver_Win32::Stop()
00091 {
00092   HWAVEOUT waveout = _waveout;
00093 
00094   /* Stop the sound thread. */
00095   _waveout = NULL;
00096   SetEvent(_event);
00097   WaitForSingleObject(_thread, INFINITE);
00098 
00099   /* Close the sound device. */
00100   waveOutReset(waveout);
00101   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00102   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00103   waveOutClose(waveout);
00104 
00105   CloseHandle(_thread);
00106   CloseHandle(_event);
00107 }