win32_s.cpp

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00001 /* $Id: win32_s.cpp 18809 2010-01-15 16:41:15Z rubidium $ */
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 
00028 static void PrepareHeader(WAVEHDR *hdr)
00029 {
00030   hdr->dwBufferLength = _bufsize * 4;
00031   hdr->dwFlags = 0;
00032   hdr->lpData = MallocT<char>(_bufsize * 4);
00033   if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00034     usererror("waveOutPrepareHeader failed");
00035 }
00036 
00037 static void FillHeaders()
00038 {
00039   WAVEHDR *hdr;
00040 
00041   for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00042     if (!(hdr->dwFlags & WHDR_INQUEUE)) {
00043       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00044       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00045         usererror("waveOutWrite failed");
00046     }
00047   }
00048 }
00049 
00050 static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
00051   DWORD dwParam1, DWORD dwParam2)
00052 {
00053   switch (uMsg) {
00054     case WOM_DONE:
00055       if (_waveout != NULL) FillHeaders();
00056       break;
00057     default: break;
00058   }
00059 }
00060 
00061 const char *SoundDriver_Win32::Start(const char * const *parm)
00062 {
00063   WAVEFORMATEX wfex;
00064   wfex.wFormatTag = WAVE_FORMAT_PCM;
00065   wfex.nChannels = 2;
00066   wfex.wBitsPerSample = 16;
00067   wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
00068   wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
00069   wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
00070 
00071   _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
00072 
00073   if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
00074     return "waveOutOpen failed";
00075 
00076   MxInitialize(wfex.nSamplesPerSec);
00077 
00078   PrepareHeader(&_wave_hdr[0]);
00079   PrepareHeader(&_wave_hdr[1]);
00080   FillHeaders();
00081   return NULL;
00082 }
00083 
00084 void SoundDriver_Win32::Stop()
00085 {
00086   HWAVEOUT waveout = _waveout;
00087 
00088   _waveout = NULL;
00089   waveOutReset(waveout);
00090   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00091   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00092   waveOutClose(waveout);
00093 }

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