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win32_s.cpp
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1 /* $Id: win32_s.cpp 27673 2016-10-30 18:22:55Z michi_cc $ */
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 #include "../os/windows/win32.h"
23
24 #include "../safeguards.h"
25
26 static FSoundDriver_Win32 iFSoundDriver_Win32;
27
28 static HWAVEOUT _waveout;
29 static WAVEHDR _wave_hdr[2];
30 static int _bufsize;
31 static HANDLE _thread;
32 static DWORD _threadId;
33 static HANDLE _event;
34
35 static void PrepareHeader(WAVEHDR *hdr)
36 {
37 hdr->dwBufferLength = _bufsize * 4;
38 hdr->dwFlags = 0;
39 hdr->lpData = MallocT<char>(_bufsize * 4);
40 if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
41 }
42
43 static DWORD WINAPI SoundThread(LPVOID arg)
44 {
45 SetWin32ThreadName(-1, "ottd:win-sound");
46
47 do {
48 for (WAVEHDR *hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
49 if ((hdr->dwFlags & WHDR_INQUEUE) != 0) continue;
50 MxMixSamples(hdr->lpData, hdr->dwBufferLength / 4);
51 if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) {
52 MessageBox(NULL, _T("Sounds are disabled until restart."), _T("waveOutWrite failed"), MB_ICONINFORMATION);
53 return 0;
54 }
55 }
56 WaitForSingleObject(_event, INFINITE);
57 } while (_waveout != NULL);
58
59 return 0;
60 }
61
62 const char *SoundDriver_Win32::Start(const char * const *parm)
63 {
64 WAVEFORMATEX wfex;
65 wfex.wFormatTag = WAVE_FORMAT_PCM;
66 wfex.nChannels = 2;
67 wfex.wBitsPerSample = 16;
68 wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
69 wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
70 wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
71
72 /* Limit buffer size to prevent overflows. */
73 _bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
74 _bufsize = min(_bufsize, UINT16_MAX);
75
76 try {
77 if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) throw "Failed to create event";
78
79 if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
80
81 MxInitialize(wfex.nSamplesPerSec);
82
83 PrepareHeader(&_wave_hdr[0]);
84 PrepareHeader(&_wave_hdr[1]);
85
86 if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
87 } catch (const char *error) {
88 this->Stop();
89 return error;
90 }
91
92 return NULL;
93 }
94
95 void SoundDriver_Win32::Stop()
96 {
97 HWAVEOUT waveout = _waveout;
98
99 /* Stop the sound thread. */
100 _waveout = NULL;
101 SetEvent(_event);
102 WaitForSingleObject(_thread, INFINITE);
103
104 /* Close the sound device. */
105 waveOutReset(waveout);
106 waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
107 waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
108 waveOutClose(waveout);
109
110 CloseHandle(_thread);
111 CloseHandle(_event);
112 }