win32_s.cpp
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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 }