1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/* $Id$ */
#include "../stdafx.h"
#ifdef WIN32_ENABLE_DIRECTMUSIC_SUPPORT
extern "C" {
#include "../openttd.h"
#include "../debug.h"
#include "../win32.h"
#include "dmusic.h"
}
#include <windows.h>
#include <dmksctrl.h>
#include <dmusici.h>
#include <dmusicc.h>
#include <dmusicf.h>
// the performance object controls manipulation of the segments
static IDirectMusicPerformance* performance = NULL;
// the loader object can load many types of DMusic related files
static IDirectMusicLoader* loader = NULL;
// the segment object is where the MIDI data is stored for playback
static IDirectMusicSegment* segment = NULL;
static bool seeking = false;
#define M(x) x "\0"
static const char ole_files[] =
M("ole32.dll")
M("CoCreateInstance")
M("CoInitialize")
M("CoUninitialize")
M("")
;
#undef M
struct ProcPtrs {
unsigned long (WINAPI * CoCreateInstance)(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID riid, LPVOID* ppv);
HRESULT (WINAPI * CoInitialize)(LPVOID pvReserved);
void (WINAPI * CoUninitialize)();
};
static ProcPtrs proc;
static const char* DMusicMidiStart(const char* const* parm)
{
if (performance != NULL) return NULL;
if (proc.CoCreateInstance == NULL) {
if (!LoadLibraryList((Function*)&proc, ole_files))
return "ole32.dll load failed";
}
// Initialize COM
if (FAILED(proc.CoInitialize(NULL))) {
return "COM initialization failed";
}
// create the performance object
if (FAILED(proc.CoCreateInstance(
CLSID_DirectMusicPerformance,
NULL,
CLSCTX_INPROC,
IID_IDirectMusicPerformance,
(LPVOID*)&performance
))) {
proc.CoUninitialize();
return "Failed to create the performance object";
}
// initialize it
if (FAILED(performance->Init(NULL, NULL, NULL))) {
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "Failed to initialize performance object";
}
// choose default Windows synth
if (FAILED(performance->AddPort(NULL))) {
performance->CloseDown();
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "AddPort failed";
}
// create the loader object; this will be used to load the MIDI file
if (FAILED(proc.CoCreateInstance(
CLSID_DirectMusicLoader,
NULL,
CLSCTX_INPROC,
IID_IDirectMusicLoader,
(LPVOID*)&loader
))) {
performance->CloseDown();
performance->Release();
performance = NULL;
proc.CoUninitialize();
return "Failed to create loader object";
}
return NULL;
}
static void DMusicMidiStop(void)
{
seeking = false;
if (performance != NULL) performance->Stop(NULL, NULL, 0, 0);
if (segment != NULL) {
segment->SetParam(GUID_Unload, -1, 0, 0, performance);
segment->Release();
segment = NULL;
}
if (performance != NULL) {
performance->CloseDown();
performance->Release();
performance = NULL;
}
if (loader != NULL) {
loader->Release();
loader = NULL;
}
proc.CoUninitialize();
}
static void DMusicMidiPlaySong(const char* filename)
{
// set up the loader object info
DMUS_OBJECTDESC obj_desc;
ZeroMemory(&obj_desc, sizeof(obj_desc));
obj_desc.dwSize = sizeof(obj_desc);
obj_desc.guidClass = CLSID_DirectMusicSegment;
obj_desc.dwValidData = DMUS_OBJ_CLASS | DMUS_OBJ_FILENAME | DMUS_OBJ_FULLPATH;
MultiByteToWideChar(
CP_ACP, MB_PRECOMPOSED,
filename, -1,
obj_desc.wszFileName, lengthof(obj_desc.wszFileName)
);
// release the existing segment if we have any
if (segment != NULL) {
segment->Release();
segment = NULL;
}
// make a new segment
if (FAILED(loader->GetObject(
&obj_desc, IID_IDirectMusicSegment, (LPVOID*)&segment
))) {
DEBUG(misc, 0) ("DirectMusic: Get object failed");
return;
}
// tell the segment what kind of data it contains
if (FAILED(segment->SetParam(
GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, performance
))) {
DEBUG(misc, 0) ("DirectMusic: SetParam (MIDI file) failed");
return;
}
// tell the segment to 'download' the instruments
if (FAILED(segment->SetParam(GUID_Download, 0xFFFFFFFF, 0, 0, performance))) {
DEBUG(misc, 0) ("DirectMusic: Failed to download instruments");
return;
}
// start playing the MIDI file
if (FAILED(performance->PlaySegment(segment, 0, 0, NULL))) {
DEBUG(misc, 0) ("DirectMusic: PlaySegment failed");
return;
}
seeking = true;
}
static void DMusicMidiStopSong(void)
{
if (FAILED(performance->Stop(segment, NULL, 0, 0))) {
DEBUG(misc, 0) ("DirecMusic: StopSegment failed");
}
seeking = false;
}
static bool DMusicMidiIsSongPlaying(void)
{
/* Not the nicest code, but there is a short delay before playing actually
* starts. OpenTTD makes no provision for this. */
if (performance->IsPlaying(segment, NULL) == S_OK) {
seeking = false;
return true;
} else {
return seeking;
}
}
static void DMusicMidiSetVolume(byte vol)
{
// 0 - 127 -> -2000 - 0
long db = vol * 2000 / 127 - 2000;
performance->SetGlobalParam(GUID_PerfMasterVolume, &db, sizeof(db));
}
extern "C" const HalMusicDriver _dmusic_midi_driver = {
DMusicMidiStart,
DMusicMidiStop,
DMusicMidiPlaySong,
DMusicMidiStopSong,
DMusicMidiIsSongPlaying,
DMusicMidiSetVolume,
};
#endif
|
