OpenTTD
win32_s.cpp
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1 /* $Id: win32_s.cpp 27383 2015-08-12 20:50:10Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * 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.
6  * 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.
7  * 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/>.
8  */
9 
12 #include "../stdafx.h"
13 #include "../openttd.h"
14 #include "../driver.h"
15 #include "../mixer.h"
16 #include "../core/alloc_func.hpp"
17 #include "../core/bitmath_func.hpp"
18 #include "../core/math_func.hpp"
19 #include "win32_s.h"
20 #include <windows.h>
21 #include <mmsystem.h>
22 
23 #include "../safeguards.h"
24 
25 static FSoundDriver_Win32 iFSoundDriver_Win32;
26 
27 static HWAVEOUT _waveout;
28 static WAVEHDR _wave_hdr[2];
29 static int _bufsize;
30 static HANDLE _thread;
31 static DWORD _threadId;
32 static HANDLE _event;
33 
34 static void PrepareHeader(WAVEHDR *hdr)
35 {
36  hdr->dwBufferLength = _bufsize * 4;
37  hdr->dwFlags = 0;
38  hdr->lpData = MallocT<char>(_bufsize * 4);
39  if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
40 }
41 
42 static DWORD WINAPI SoundThread(LPVOID arg)
43 {
44  do {
45  for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
46  if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
47  MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
48  if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) {
49  MessageBox(NULL, _T("Sounds are disabled until restart."), _T("waveOutWrite failed"), MB_ICONINFORMATION);
50  return 0;
51  }
52  }
53  WaitForSingleObject(_event, INFINITE);
54  } while (_waveout != NULL);
55 
56  return 0;
57 }
58 
59 const char *SoundDriver_Win32::Start(const char * const *parm)
60 {
61  WAVEFORMATEX wfex;
62  wfex.wFormatTag = WAVE_FORMAT_PCM;
63  wfex.nChannels = 2;
64  wfex.wBitsPerSample = 16;
65  wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
66  wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
67  wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
68 
69  /* Limit buffer size to prevent overflows. */
70  _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
71  _bufsize = min(_bufsize, UINT16_MAX);
72 
73  try {
74  if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) throw "Failed to create event";
75 
76  if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
77 
78  MxInitialize(wfex.nSamplesPerSec);
79 
80  PrepareHeader(&_wave_hdr[0]);
81  PrepareHeader(&_wave_hdr[1]);
82 
83  if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
84  } catch (const char *error) {
85  this->Stop();
86  return error;
87  }
88 
89  return NULL;
90 }
91 
93 {
94  HWAVEOUT waveout = _waveout;
95 
96  /* Stop the sound thread. */
97  _waveout = NULL;
98  SetEvent(_event);
99  WaitForSingleObject(_thread, INFINITE);
100 
101  /* Close the sound device. */
102  waveOutReset(waveout);
103  waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
104  waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
105  waveOutClose(waveout);
106 
107  CloseHandle(_thread);
108  CloseHandle(_event);
109 }