/
native_midi_macosx.c
331 lines (261 loc) · 8.34 KB
1
/*
2
3
native_midi_macosx: Native Midi support on Mac OS X for the SDL_mixer library
Copyright (C) 2009 Ryan C. Gordon <icculus@icculus.org>
4
5
6
7
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
8
9
10
11
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
12
13
14
15
16
17
18
19
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
20
21
22
23
24
25
26
27
28
*/
/* This is Mac OS X only, using Core MIDI.
Mac OS 9 support via QuickTime is in native_midi_mac.c */
#include "SDL_config.h"
#if __MACOSX__
29
#include <Carbon/Carbon.h>
30
#include <AudioToolbox/AudioToolbox.h>
31
#include <AvailabilityMacros.h>
32
33
#include "../SDL_mixer.h"
34
35
36
37
38
39
40
41
42
#include "SDL_endian.h"
#include "native_midi.h"
/* Native Midi song */
struct _NativeMidiSong
{
MusicPlayer player;
MusicSequence sequence;
MusicTimeStamp endTime;
43
AudioUnit audiounit;
44
45
46
};
static NativeMidiSong *currentsong = NULL;
47
static int latched_volume = MIX_MAX_VOLUME;
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
static OSStatus
GetSequenceLength(MusicSequence sequence, MusicTimeStamp *_sequenceLength)
{
// http://lists.apple.com/archives/Coreaudio-api/2003/Jul/msg00370.html
// figure out sequence length
UInt32 ntracks, i;
MusicTimeStamp sequenceLength = 0;
OSStatus err;
err = MusicSequenceGetTrackCount(sequence, &ntracks);
if (err != noErr)
return err;
for (i = 0; i < ntracks; ++i)
{
MusicTrack track;
MusicTimeStamp tracklen = 0;
UInt32 tracklenlen = sizeof (tracklen);
err = MusicSequenceGetIndTrack(sequence, i, &track);
if (err != noErr)
return err;
err = MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength,
&tracklen, &tracklenlen);
if (err != noErr)
return err;
if (sequenceLength < tracklen)
sequenceLength = tracklen;
}
*_sequenceLength = sequenceLength;
return noErr;
}
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
/* we're looking for the sequence output audiounit. */
static OSStatus
GetSequenceAudioUnit(MusicSequence sequence, AudioUnit *aunit)
{
AUGraph graph;
UInt32 nodecount, i;
OSStatus err;
err = MusicSequenceGetAUGraph(sequence, &graph);
if (err != noErr)
return err;
err = AUGraphGetNodeCount(graph, &nodecount);
if (err != noErr)
return err;
for (i = 0; i < nodecount; i++) {
AUNode node;
if (AUGraphGetIndNode(graph, i, &node) != noErr)
continue; /* better luck next time. */
109
#if MAC_OS_X_VERSION_MIN_REQUIRED < 1060 /* this is deprecated, but works back to 10.0 */
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
{
struct ComponentDescription desc;
UInt32 classdatasize = 0;
void *classdata = NULL;
err = AUGraphGetNodeInfo(graph, node, &desc, &classdatasize,
&classdata, aunit);
if (err != noErr)
continue;
else if (desc.componentType != kAudioUnitType_Output)
continue;
else if (desc.componentSubType != kAudioUnitSubType_DefaultOutput)
continue;
}
#else /* not deprecated, but requires 10.5 or later */
{
AudioComponentDescription desc;
if (AUGraphNodeInfo(graph, node, &desc, aunit) != noErr)
continue;
else if (desc.componentType != kAudioUnitType_Output)
continue;
else if (desc.componentSubType != kAudioUnitSubType_DefaultOutput)
continue;
}
#endif
return noErr; /* found it! */
}
return kAUGraphErr_NodeNotFound;
}
142
143
144
145
146
147
148
149
150
151
int native_midi_detect()
{
return 1; /* always available. */
}
NativeMidiSong *native_midi_loadsong(const char *midifile)
{
NativeMidiSong *retval = NULL;
SDL_RWops *rw = SDL_RWFromFile(midifile, "rb");
if (rw != NULL) {
152
retval = native_midi_loadsong_RW(rw, 1);
153
154
155
156
157
}
return retval;
}
158
NativeMidiSong *native_midi_loadsong_RW(SDL_RWops *rw, int freerw)
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
{
NativeMidiSong *retval = NULL;
void *buf = NULL;
int len = 0;
CFDataRef data = NULL;
if (SDL_RWseek(rw, 0, RW_SEEK_END) < 0)
goto fail;
len = SDL_RWtell(rw);
if (len < 0)
goto fail;
if (SDL_RWseek(rw, 0, RW_SEEK_SET) < 0)
goto fail;
buf = malloc(len);
if (buf == NULL)
goto fail;
if (SDL_RWread(rw, buf, len, 1) != 1)
goto fail;
retval = malloc(sizeof(NativeMidiSong));
if (retval == NULL)
goto fail;
memset(retval, '\0', sizeof (*retval));
if (NewMusicPlayer(&retval->player) != noErr)
goto fail;
if (NewMusicSequence(&retval->sequence) != noErr)
goto fail;
data = CFDataCreate(NULL, (const UInt8 *) buf, len);
if (data == NULL)
goto fail;
free(buf);
buf = NULL;
198
#if MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4 /* this is deprecated, but works back to 10.3 */
199
200
201
if (MusicSequenceLoadSMFDataWithFlags(retval->sequence, data, 0) != noErr)
goto fail;
#else /* not deprecated, but requires 10.5 or later */
202
if (MusicSequenceFileLoadData(retval->sequence, data, 0, 0) != noErr)
203
204
205
206
207
208
209
210
211
212
213
214
goto fail;
#endif
CFRelease(data);
data = NULL;
if (GetSequenceLength(retval->sequence, &retval->endTime) != noErr)
goto fail;
if (MusicPlayerSetSequence(retval->player, retval->sequence) != noErr)
goto fail;
215
216
217
if (freerw)
SDL_RWclose(rw);
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
return retval;
fail:
if (retval) {
if (retval->sequence)
DisposeMusicSequence(retval->sequence);
if (retval->player)
DisposeMusicPlayer(retval->player);
free(retval);
}
if (data)
CFRelease(data);
if (buf)
free(buf);
235
236
237
if (freerw)
SDL_RWclose(rw);
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
return NULL;
}
void native_midi_freesong(NativeMidiSong *song)
{
if (song != NULL) {
if (currentsong == song)
currentsong = NULL;
MusicPlayerStop(song->player);
DisposeMusicSequence(song->sequence);
DisposeMusicPlayer(song->player);
free(song);
}
}
void native_midi_start(NativeMidiSong *song)
{
255
256
int vol;
257
258
259
if (song == NULL)
return;
260
261
SDL_PauseAudio(1);
SDL_UnlockAudio();
262
263
264
265
266
if (currentsong)
MusicPlayerStop(currentsong->player);
currentsong = song;
267
268
269
MusicPlayerPreroll(song->player);
MusicPlayerSetTime(song->player, 0);
270
271
MusicPlayerStart(song->player);
272
273
274
275
276
277
278
279
GetSequenceAudioUnit(song->sequence, &song->audiounit);
vol = latched_volume;
latched_volume++; /* just make this not match. */
native_midi_setvolume(vol);
SDL_LockAudio();
SDL_PauseAudio(0);
280
281
}
282
283
284
285
286
287
288
int native_midi_jump_to_time(NativeMidiSong *song, double time)
{
if (MusicPlayerSetTime(song->player, time) != noErr)
return -1;
return 0;
}
289
290
291
void native_midi_stop()
{
if (currentsong) {
292
293
SDL_PauseAudio(1);
SDL_UnlockAudio();
294
295
MusicPlayerStop(currentsong->player);
currentsong = NULL;
296
297
SDL_LockAudio();
SDL_PauseAudio(0);
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
}
}
int native_midi_active()
{
MusicTimeStamp currentTime = 0;
if (currentsong == NULL)
return 0;
MusicPlayerGetTime(currentsong->player, ¤tTime);
return ((currentTime < currentsong->endTime) ||
(currentTime >= kMusicTimeStamp_EndOfTrack));
}
void native_midi_setvolume(int volume)
{
314
315
316
317
318
319
320
321
322
if (latched_volume == volume)
return;
latched_volume = volume;
if ((currentsong) && (currentsong->audiounit)) {
const float floatvol = ((float) volume) / ((float) MIX_MAX_VOLUME);
AudioUnitSetParameter(currentsong->audiounit, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, floatvol, 0);
}
323
324
325
326
327
328
329
330
}
const char *native_midi_error(void)
{
return ""; /* !!! FIXME */
}
#endif /* Mac OS X native MIDI support */