win32_s.cpp

00001 /* $Id: win32_s.cpp 12869 2008-04-24 12:36:18Z rubidium $ */
00002 
00003 #include "../stdafx.h"
00004 #include "../openttd.h"
00005 #include "../driver.h"
00006 #include "../mixer.h"
00007 #include "../core/alloc_func.hpp"
00008 #include "win32_s.h"
00009 #include <windows.h>
00010 #include <mmsystem.h>
00011 
00012 static FSoundDriver_Win32 iFSoundDriver_Win32;
00013 
00014 static HWAVEOUT _waveout;
00015 static WAVEHDR _wave_hdr[2];
00016 static int _bufsize;
00017 
00018 static void PrepareHeader(WAVEHDR *hdr)
00019 {
00020   hdr->dwBufferLength = _bufsize * 4;
00021   hdr->dwFlags = 0;
00022   hdr->lpData = MallocT<char>(_bufsize * 4);
00023   if (hdr->lpData == NULL ||
00024       waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00025     error("waveOutPrepareHeader failed");
00026 }
00027 
00028 static void FillHeaders()
00029 {
00030   WAVEHDR *hdr;
00031 
00032   for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
00033     if (!(hdr->dwFlags & WHDR_INQUEUE)) {
00034       MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
00035       if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
00036         error("waveOutWrite failed");
00037     }
00038   }
00039 }
00040 
00041 static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
00042   DWORD dwParam1, DWORD dwParam2)
00043 {
00044   switch (uMsg) {
00045     case WOM_DONE:
00046       if (_waveout != NULL) FillHeaders();
00047       break;
00048     default: break;
00049   }
00050 }
00051 
00052 const char *SoundDriver_Win32::Start(const char* const* parm)
00053 {
00054   WAVEFORMATEX wfex;
00055   wfex.wFormatTag = WAVE_FORMAT_PCM;
00056   wfex.nChannels = 2;
00057   wfex.wBitsPerSample = 16;
00058   wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 11025);
00059   wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
00060   wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
00061 
00062   _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 2048 : 1024);
00063 
00064   if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
00065     return "waveOutOpen failed";
00066 
00067   PrepareHeader(&_wave_hdr[0]);
00068   PrepareHeader(&_wave_hdr[1]);
00069   FillHeaders();
00070   return NULL;
00071 }
00072 
00073 void SoundDriver_Win32::Stop()
00074 {
00075   HWAVEOUT waveout = _waveout;
00076 
00077   _waveout = NULL;
00078   waveOutReset(waveout);
00079   waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
00080   waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
00081   waveOutClose(waveout);
00082 }

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