win32_s.cpp

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00001 /* $Id: win32_s.cpp 16804 2009-07-13 10:16:50Z rubidium $ */
00002 
00005 #include "../stdafx.h"
00006 #include "../openttd.h"
00007 #include "../driver.h"
00008 #include "../mixer.h"
00009 #include "../core/alloc_func.hpp"
00010 #include "win32_s.h"
00011 #include <windows.h>
00012 #include <mmsystem.h>
00013 
00014 static FSoundDriver_Win32 iFSoundDriver_Win32;
00015 
00016 static HWAVEOUT _waveout;
00017 static WAVEHDR _wave_hdr[2];
00018 static int _bufsize;
00019 
00020 static void PrepareHeader(WAVEHDR *hdr)
00021 {
00022   hdr->dwBufferLength = _bufsize * 4;
00023   hdr->dwFlags = 0;
00024   hdr->lpData = MallocT<char>(_bufsize * 4);
00025   if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00026     usererror("waveOutPrepareHeader failed");
00027 }
00028 
00029 static void FillHeaders()
00030 {
00031   WAVEHDR *hdr;
00032 
00033   for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00034     if (!(hdr->dwFlags & WHDR_INQUEUE)) {
00035       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00036       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00037         usererror("waveOutWrite failed");
00038     }
00039   }
00040 }
00041 
00042 static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
00043   DWORD dwParam1, DWORD dwParam2)
00044 {
00045   switch (uMsg) {
00046     case WOM_DONE:
00047       if (_waveout != NULL) FillHeaders();
00048       break;
00049     default: break;
00050   }
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", 11025);
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) ? 2048 : 1024);
00064 
00065   if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
00066     return "waveOutOpen failed";
00067 
00068   MxInitialize(wfex.nSamplesPerSec);
00069 
00070   PrepareHeader(&_wave_hdr[0]);
00071   PrepareHeader(&_wave_hdr[1]);
00072   FillHeaders();
00073   return NULL;
00074 }
00075 
00076 void SoundDriver_Win32::Stop()
00077 {
00078   HWAVEOUT waveout = _waveout;
00079 
00080   _waveout = NULL;
00081   waveOutReset(waveout);
00082   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00083   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00084   waveOutClose(waveout);
00085 }

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