OpenTTD Source  20241108-master-g80f628063a
win32_s.cpp
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1 /*
2  * This file is part of OpenTTD.
3  * 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.
4  * 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.
5  * 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/>.
6  */
7 
10 #include "../stdafx.h"
11 #include "../openttd.h"
12 #include "../driver.h"
13 #include "../mixer.h"
14 #include "../core/alloc_func.hpp"
15 #include "../core/bitmath_func.hpp"
16 #include "../core/math_func.hpp"
17 #include "win32_s.h"
18 #include <windows.h>
19 #include <mmsystem.h>
20 #include <versionhelpers.h>
21 #include "../os/windows/win32.h"
22 #include "../thread.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)
44 {
45  SetCurrentThreadName("ottd:win-sound");
46 
47  do {
48  for (auto &hdr : _wave_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(nullptr, L"Sounds are disabled until restart.", L"waveOutWrite failed", MB_ICONINFORMATION);
53  return 0;
54  }
55  }
56  WaitForSingleObject(_event, INFINITE);
57  } while (_waveout != nullptr);
58 
59  return 0;
60 }
61 
62 std::optional<std::string_view> SoundDriver_Win32::Start(const StringList &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, "samples", 1024);
74  _bufsize = std::min<int>(_bufsize, UINT16_MAX);
75 
76  try {
77  if (nullptr == (_event = CreateEvent(nullptr, FALSE, FALSE, nullptr))) 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 (nullptr == (_thread = CreateThread(nullptr, 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 std::nullopt;
93 }
94 
96 {
97  HWAVEOUT waveout = _waveout;
98 
99  /* Stop the sound thread. */
100  _waveout = nullptr;
101  SignalObjectAndWait(_event, _thread, INFINITE, FALSE);
102 
103  /* Close the sound device. */
104  waveOutReset(waveout);
105  waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
106  waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
107  waveOutClose(waveout);
108 
109  CloseHandle(_thread);
110  CloseHandle(_event);
111 }
Factory for the sound driver for Windows.
Definition: win32_s.h:25
void Stop() override
Stop this driver.
Definition: win32_s.cpp:95
std::optional< std::string_view > Start(const StringList &param) override
Start this driver.
Definition: win32_s.cpp:62
int GetDriverParamInt(const StringList &parm, const char *name, int def)
Get an integer parameter the list of parameters.
Definition: driver.cpp:76
std::vector< std::string > StringList
Type for a list of strings.
Definition: string_type.h:60
Base for Windows sound handling.