win32_s.cpp

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00001 /* $Id: win32_s.cpp 18934 2010-01-28 13:49:20Z glx $ */
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 "win32_s.h"
00019 #include <windows.h>
00020 #include <mmsystem.h>
00021 
00022 static FSoundDriver_Win32 iFSoundDriver_Win32;
00023 
00024 static HWAVEOUT _waveout;
00025 static WAVEHDR _wave_hdr[2];
00026 static int _bufsize;
00027 static HANDLE _thread;
00028 static DWORD _threadId;
00029 static HANDLE _event;
00030 
00031 static void PrepareHeader(WAVEHDR *hdr)
00032 {
00033   hdr->dwBufferLength = _bufsize * 4;
00034   hdr->dwFlags = 0;
00035   hdr->lpData = MallocT<char>(_bufsize * 4);
00036   if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) usererror("waveOutPrepareHeader failed");
00037 }
00038 
00039 static DWORD WINAPI SoundThread(LPVOID arg)
00040 {
00041   do {
00042     for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00043       if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
00044       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00045       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) usererror("waveOutWrite failed");
00046     }
00047     WaitForSingleObject(_event, INFINITE);
00048   } while (_waveout != NULL);
00049 
00050   return 0;
00051 }
00052 
00053 const char *SoundDriver_Win32::Start(const char * const *parm)
00054 {
00055   WAVEFORMATEX wfex;
00056   wfex.wFormatTag = WAVE_FORMAT_PCM;
00057   wfex.nChannels = 2;
00058   wfex.wBitsPerSample = 16;
00059   wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
00060   wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
00061   wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
00062 
00063   _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
00064 
00065   if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) return "Failed to create event";
00066 
00067   if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) return "waveOutOpen failed";
00068 
00069   MxInitialize(wfex.nSamplesPerSec);
00070 
00071   PrepareHeader(&_wave_hdr[0]);
00072   PrepareHeader(&_wave_hdr[1]);
00073 
00074   if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) return "Failed to create thread";
00075 
00076   return NULL;
00077 }
00078 
00079 void SoundDriver_Win32::Stop()
00080 {
00081   HWAVEOUT waveout = _waveout;
00082 
00083   /* Stop the sound thread. */
00084   _waveout = NULL;
00085   SetEvent(_event);
00086   WaitForSingleObject(_thread, INFINITE);
00087 
00088   /* Close the sound device. */
00089   waveOutReset(waveout);
00090   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00091   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00092   waveOutClose(waveout);
00093 
00094   CloseHandle(_thread);
00095   CloseHandle(_event);
00096 }

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