summaryrefslogtreecommitdiff
path: root/src/music/cocoa_m.cpp
blob: 9fec5ba15bd83a3a7da35df9d62e084311682676 (plain)
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
/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */

/**
 * @file cocoa_m.cpp
 * @brief MIDI music player for MacOS X using CoreAudio.
 */


#ifdef WITH_COCOA

#include "../stdafx.h"
#include "../os/macosx/macos.h"
#include "cocoa_m.h"
#include "midifile.hpp"
#include "../debug.h"
#include "../base_media_base.h"

#include <CoreServices/CoreServices.h>
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h>

#include "../safeguards.h"

#if !defined(HAVE_OSX_1011_SDK)
#define kMusicSequenceFile_AnyType 0
#endif

static FMusicDriver_Cocoa iFMusicDriver_Cocoa;


static MusicPlayer    _player = nullptr;
static MusicSequence  _sequence = nullptr;
static MusicTimeStamp _seq_length = 0;
static bool           _playing = false;
static byte           _volume = 127;


/** Set the volume of the current sequence. */
static void DoSetVolume()
{
	if (_sequence == nullptr) return;

	AUGraph graph;
	MusicSequenceGetAUGraph(_sequence, &graph);

	AudioUnit output_unit = nullptr;

	/* Get output audio unit */
	UInt32 node_count = 0;
	AUGraphGetNodeCount(graph, &node_count);
	for (UInt32 i = 0; i < node_count; i++) {
		AUNode node;
		AUGraphGetIndNode(graph, i, &node);

		AudioUnit unit;
		AudioComponentDescription desc;
		AUGraphNodeInfo(graph, node, &desc, &unit);

		if (desc.componentType == kAudioUnitType_Output) {
			output_unit = unit;
			break;
		}
	}
	if (output_unit == nullptr) {
		DEBUG(driver, 1, "cocoa_m: Failed to get output node to set volume");
		return;
	}

	Float32 vol = _volume / 127.0f;  // 0 - +127 -> 0.0 - 1.0
	AudioUnitSetParameter(output_unit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, vol, 0);
}


/**
 * Initialized the MIDI player, including QuickTime initialization.
 */
const char *MusicDriver_Cocoa::Start(const char * const *parm)
{
	if (NewMusicPlayer(&_player) != noErr) return "failed to create music player";

	return nullptr;
}


/**
 * Checks whether the player is active.
 */
bool MusicDriver_Cocoa::IsSongPlaying()
{
	if (!_playing) return false;

	MusicTimeStamp time = 0;
	MusicPlayerGetTime(_player, &time);
	return time < _seq_length;
}


/**
 * Stops the MIDI player.
 */
void MusicDriver_Cocoa::Stop()
{
	if (_player != nullptr) DisposeMusicPlayer(_player);
	if (_sequence != nullptr) DisposeMusicSequence(_sequence);
}


/**
 * Starts playing a new song.
 *
 * @param song Description of music to load and play
 */
void MusicDriver_Cocoa::PlaySong(const MusicSongInfo &song)
{
	std::string filename = MidiFile::GetSMFFile(song);

	DEBUG(driver, 2, "cocoa_m: trying to play '%s'", filename.c_str());

	this->StopSong();
	if (_sequence != nullptr) {
		DisposeMusicSequence(_sequence);
		_sequence = nullptr;
	}

	if (filename.empty()) return;

	if (NewMusicSequence(&_sequence) != noErr) {
		DEBUG(driver, 0, "cocoa_m: Failed to create music sequence");
		return;
	}

	const char *os_file = OTTD2FS(filename.c_str());
	CFAutoRelease<CFURLRef> url(CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, (const UInt8*)os_file, strlen(os_file), false));

	if (MusicSequenceFileLoad(_sequence, url.get(), kMusicSequenceFile_AnyType, 0) != noErr) {
		DEBUG(driver, 0, "cocoa_m: Failed to load MIDI file");
		return;
	}

	/* Construct audio graph */
	AUGraph graph = nullptr;

	MusicSequenceGetAUGraph(_sequence, &graph);
	AUGraphOpen(graph);
	if (AUGraphInitialize(graph) != noErr) {
		DEBUG(driver, 0, "cocoa_m: Failed to initialize AU graph");
		return;
	}

	/* Figure out sequence length */
	UInt32 num_tracks;
	MusicSequenceGetTrackCount(_sequence, &num_tracks);
	_seq_length = 0;
	for (UInt32 i = 0; i < num_tracks; i++) {
		MusicTrack     track = nullptr;
		MusicTimeStamp track_length = 0;
		UInt32         prop_size = sizeof(MusicTimeStamp);
		MusicSequenceGetIndTrack(_sequence, i, &track);
		MusicTrackGetProperty(track, kSequenceTrackProperty_TrackLength, &track_length, &prop_size);
		if (track_length > _seq_length) _seq_length = track_length;
	}
	/* Add 8 beats for reverb/long note release */
	_seq_length += 8;

	DoSetVolume();
	MusicPlayerSetSequence(_player, _sequence);
	MusicPlayerPreroll(_player);
	if (MusicPlayerStart(_player) != noErr) return;
	_playing = true;

	DEBUG(driver, 3, "cocoa_m: playing '%s'", filename.c_str());
}


/**
 * Stops playing the current song, if the player is active.
 */
void MusicDriver_Cocoa::StopSong()
{
	MusicPlayerStop(_player);
	MusicPlayerSetSequence(_player, nullptr);
	_playing = false;
}


/**
 * Changes the playing volume of the MIDI player.
 *
 * @param vol The desired volume, range of the value is @c 0-127
 */
void MusicDriver_Cocoa::SetVolume(byte vol)
{
	_volume = vol;
	DoSetVolume();
}

#endif /* WITH_COCOA */