win32_s.cpp

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00001 /* $Id: win32_s.cpp 14949 2009-01-10 00:31:47Z 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 (hdr->lpData == NULL ||
00026       waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00027     usererror("waveOutPrepareHeader failed");
00028 }
00029 
00030 static void FillHeaders()
00031 {
00032   WAVEHDR *hdr;
00033 
00034   for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00035     if (!(hdr->dwFlags & WHDR_INQUEUE)) {
00036       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00037       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00038         usererror("waveOutWrite failed");
00039     }
00040   }
00041 }
00042 
00043 static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
00044   DWORD dwParam1, DWORD dwParam2)
00045 {
00046   switch (uMsg) {
00047     case WOM_DONE:
00048       if (_waveout != NULL) FillHeaders();
00049       break;
00050     default: break;
00051   }
00052 }
00053 
00054 const char *SoundDriver_Win32::Start(const char * const *parm)
00055 {
00056   WAVEFORMATEX wfex;
00057   wfex.wFormatTag = WAVE_FORMAT_PCM;
00058   wfex.nChannels = 2;
00059   wfex.wBitsPerSample = 16;
00060   wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 11025);
00061   wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
00062   wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
00063 
00064   _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 2048 : 1024);
00065 
00066   if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
00067     return "waveOutOpen failed";
00068 
00069   PrepareHeader(&_wave_hdr[0]);
00070   PrepareHeader(&_wave_hdr[1]);
00071   FillHeaders();
00072   return NULL;
00073 }
00074 
00075 void SoundDriver_Win32::Stop()
00076 {
00077   HWAVEOUT waveout = _waveout;
00078 
00079   _waveout = NULL;
00080   waveOutReset(waveout);
00081   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00082   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00083   waveOutClose(waveout);
00084 }

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