/
native_midi_macosx.c
341 lines (274 loc) · 9.19 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
30
#include <CoreServices/CoreServices.h> /* ComponentDescription */
#include <AudioUnit/AudioUnit.h>
31
#include <AudioToolbox/AudioToolbox.h>
32
#include <AvailabilityMacros.h>
33
34
#include "../SDL_mixer.h"
35
36
37
38
39
40
41
42
43
#include "SDL_endian.h"
#include "native_midi.h"
/* Native Midi song */
struct _NativeMidiSong
{
MusicPlayer player;
MusicSequence sequence;
MusicTimeStamp endTime;
44
AudioUnit audiounit;
45
int loops;
46
47
48
};
static NativeMidiSong *currentsong = NULL;
49
static int latched_volume = MIX_MAX_VOLUME;
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
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;
}
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
/* 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. */
111
#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050 /* this is deprecated, but works back to 10.0 */
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
{
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 */
{
127
128
129
130
131
132
133
134
# if !defined(AUDIO_UNIT_VERSION) || ((AUDIO_UNIT_VERSION + 0) < 1060)
/* AUGraphAddNode () is changed to take an AudioComponentDescription*
* desc parameter instead of a ComponentDescription* in the 10.6 SDK.
* AudioComponentDescription is in 10.6 or newer, but it is actually
* the same as struct ComponentDescription with 20 bytes of size and
* the same offsets of all members, therefore, is binary compatible. */
# define AudioComponentDescription ComponentDescription
# endif
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
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;
}
152
153
154
155
156
int native_midi_detect()
{
return 1; /* always available. */
}
157
NativeMidiSong *native_midi_loadsong_RW(SDL_RWops *rw, int freerw)
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
{
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;
197
198
199
200
201
202
203
204
205
206
#if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
/* MusicSequenceLoadSMFData() (avail. in 10.2, no 64 bit) is
* equivalent to calling MusicSequenceLoadSMFDataWithFlags()
* with a flags value of 0 (avail. in 10.3, avail. 64 bit).
* So, we use MusicSequenceLoadSMFData() for powerpc versions
* but the *WithFlags() on intel which require 10.4 anyway. */
# if defined(__ppc__) || defined(__POWERPC__)
if (MusicSequenceLoadSMFData(song->sequence, data) != noErr)
goto fail;
# else
207
208
if (MusicSequenceLoadSMFDataWithFlags(retval->sequence, data, 0) != noErr)
goto fail;
209
210
# endif
#else /* MusicSequenceFileLoadData() requires 10.5 or later. */
211
if (MusicSequenceFileLoadData(retval->sequence, data, 0, 0) != noErr)
212
213
214
215
216
217
218
219
220
221
222
223
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;
224
225
226
if (freerw)
SDL_RWclose(rw);
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
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);
244
245
246
if (freerw)
SDL_RWclose(rw);
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
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);
}
}
262
void native_midi_start(NativeMidiSong *song, int loops)
263
{
264
265
int vol;
266
267
268
if (song == NULL)
return;
269
270
SDL_PauseAudio(1);
SDL_UnlockAudio();
271
272
273
274
275
if (currentsong)
MusicPlayerStop(currentsong->player);
currentsong = song;
276
currentsong->loops = loops;
277
278
279
MusicPlayerPreroll(song->player);
MusicPlayerSetTime(song->player, 0);
280
281
MusicPlayerStart(song->player);
282
283
284
285
286
287
288
289
GetSequenceAudioUnit(song->sequence, &song->audiounit);
vol = latched_volume;
latched_volume++; /* just make this not match. */
native_midi_setvolume(vol);
SDL_LockAudio();
SDL_PauseAudio(0);
290
291
292
293
294
}
void native_midi_stop()
{
if (currentsong) {
295
296
SDL_PauseAudio(1);
SDL_UnlockAudio();
297
298
MusicPlayerStop(currentsong->player);
currentsong = NULL;
299
300
SDL_LockAudio();
SDL_PauseAudio(0);
301
302
303
304
305
306
307
308
309
310
}
}
int native_midi_active()
{
MusicTimeStamp currentTime = 0;
if (currentsong == NULL)
return 0;
MusicPlayerGetTime(currentsong->player, ¤tTime);
311
312
313
314
315
316
317
318
319
if ((currentTime < currentsong->endTime) ||
(currentTime >= kMusicTimeStamp_EndOfTrack)) {
return 1;
} else if (currentsong->loops) {
--currentsong->loops;
MusicPlayerSetTime(currentsong->player, 0);
return 1;
}
return 0;
320
321
322
323
}
void native_midi_setvolume(int volume)
{
324
325
326
327
328
329
330
331
332
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);
}
333
334
335
336
337
338
339
340
}
const char *native_midi_error(void)
{
return ""; /* !!! FIXME */
}
#endif /* Mac OS X native MIDI support */