aboutsummaryrefslogtreecommitdiff
path: root/engines/titanic/sound/qmixer.cpp
blob: f373b19704d85f4b43d758155b29bd248ad98b3b (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
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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "titanic/sound/qmixer.h"
#include "titanic/debugger.h"
#include "common/system.h"

namespace Titanic {

QMixer::QMixer(Audio::Mixer *mixer) : _mixer(mixer) {
}

QMixer::~QMixer() {
	_channels.clear();
}

bool QMixer::qsWaveMixInitEx(const QMIXCONFIG &config) {
	assert(_channels.empty());
	assert(config.iChannels > 0 && config.iChannels < 256);

	_channels.resize(config.iChannels);
	return true;
}

void QMixer::qsWaveMixActivate(bool fActivate) {
	// Not currently implemented in ScummVM
}

int QMixer::qsWaveMixOpenChannel(int iChannel, QMixFlag mode) {
	// Not currently implemented in ScummVM
	return 0;
}

int QMixer::qsWaveMixEnableChannel(int iChannel, uint flags, bool enabled) {
	// Not currently implemented in ScummVM
	return 0;
}

void QMixer::qsWaveMixCloseSession() {
	_mixer->stopAll();
	_channels.clear();
}

void QMixer::qsWaveMixFreeWave(Audio::SoundHandle &handle) {
	_mixer->stopHandle(handle);
}

void QMixer::qsWaveMixFlushChannel(int iChannel, uint flags) {
	if (flags & QMIX_OPENALL) {
		// Ignore channel, and flush all the channels
		for (uint idx = 0; idx < _channels.size(); ++idx)
			qsWaveMixFlushChannel(idx, 0);
	} else {
		// Flush the specified channel
		Common::List<SoundEntry>::iterator i;
		Common::List<SoundEntry> &sounds = _channels[iChannel]._sounds;
		for (i = sounds.begin(); i != sounds.end(); ++i)
			_mixer->stopHandle((*i)._soundHandle);

		sounds.clear();
	}
}

void QMixer::qsWaveMixSetPanRate(int iChannel, uint flags, uint rate) {
	ChannelEntry &channel = _channels[iChannel];
	channel._panRate = rate;
	channel._volumeChangeStart = channel._volumeChangeEnd = 0;
}

void QMixer::qsWaveMixSetVolume(int iChannel, uint flags, uint volume) {
	ChannelEntry &channel = _channels[iChannel];

	// QMixer volumes go from 0-32767, but we need to convert to 0-255 for ScummVM
	assert(volume <= 32767);
	byte newVolume = (volume >= 32700) ? 255 : volume * 255 / 32767;

	channel._volumeStart = channel._volume;
	channel._volumeEnd = newVolume;
	channel._volumeChangeStart = g_system->getMillis();
	channel._volumeChangeEnd = channel._volumeChangeStart + channel._panRate;
	debugC(DEBUG_DETAILED, kDebugCore, "qsWaveMixSetPanRate vol=%d to %d, start=%u, end=%u",
		channel._volumeStart, channel._volumeEnd, channel._volumeChangeStart, channel._volumeChangeEnd);
}

void QMixer::qsWaveMixSetSourcePosition(int iChannel, uint flags, const QSVECTOR &position) {
	ChannelEntry &channel = _channels[iChannel];

	// Flag whether distance should reset when a new sound is started
	channel._resetDistance = (flags & QMIX_USEONCE) != 0;

	// Currently, we only do a basic simulation of spatial positioning by
	// getting the distance, and proportionately reducing the volume the
	// further away the source is
	channel._distance = sqrt(position.x * position.x + position.y * position.y
		+ position.z * position.z);
}

void QMixer::qsWaveMixSetPolarPosition(int iChannel, uint flags, const QSPOLAR &position) {
	ChannelEntry &channel = _channels[iChannel];

	// Flag whether distance should reset when a new sound is started
	channel._resetDistance = (flags & QMIX_USEONCE) != 0;

	// Currently, we only do a basic simulation of spatial positioning by
	// getting the distance, and proportionately reducing the volume the
	// further away the source is
	channel._distance = position.range;
}

void QMixer::qsWaveMixSetListenerPosition(const QSVECTOR &position, uint flags) {
	// Not currently implemented in ScummVM
}

void QMixer::qsWaveMixSetListenerOrientation(const QSVECTOR &direction, const QSVECTOR &up, uint flags) {
	// Not currently implemented in ScummVM
}

void QMixer::qsWaveMixSetDistanceMapping(int iChannel, uint flags, const QMIX_DISTANCES &distances) {
	// Not currently implemented in ScummVM
}

void QMixer::qsWaveMixSetFrequency(int iChannel, uint flags, uint frequency) {
	// Not currently implemented in ScummVM
}

void QMixer::qsWaveMixSetSourceVelocity(int iChannel, uint flags, const QSVECTOR &velocity) {
	// Not currently implemented in ScummVM
}

int QMixer::qsWaveMixPlayEx(int iChannel, uint flags, CWaveFile *waveFile, int loops, const QMIXPLAYPARAMS &params) {
	if (iChannel == -1) {
		// Find a free channel
		for (iChannel = 0; iChannel < (int)_channels.size(); ++iChannel) {
			if (_channels[iChannel]._sounds.empty())
				break;
		}
		assert(iChannel != (int)_channels.size());
	}

	// If the new sound replaces current ones, then clear the channel
	ChannelEntry &channel = _channels[iChannel];
	if (flags & QMIX_CLEARQUEUE) {
		if (!channel._sounds.empty() && channel._sounds.front()._started)
			_mixer->stopHandle(channel._sounds.front()._soundHandle);

		channel._sounds.clear();
	}

	// Add the sound to the channel
	channel._sounds.push_back(SoundEntry(waveFile, params.callback, loops, params.dwUser));
	qsWaveMixPump();

	return 0;
}

bool QMixer::qsWaveMixIsChannelDone(int iChannel) const {
	return _channels[iChannel]._sounds.empty();
}

void QMixer::qsWaveMixPump() {
	// Iterate through each of the channels
	for (uint iChannel = 0; iChannel < _channels.size(); ++iChannel) {
		ChannelEntry &channel = _channels[iChannel];

		// If there's a transition in sound volume in progress, handle it
		if (channel._volumeChangeEnd) {
			byte oldVolume = channel._volume;
			uint currentTicks = g_system->getMillis();

			if (currentTicks >= channel._volumeChangeEnd) {
				// Reached end of transition period
				channel._volume = channel._volumeEnd;
				channel._volumeChangeStart = channel._volumeChangeEnd = 0;
			} else {
				// Transition in progress, so figure out new volume
				channel._volume = (int)channel._volumeStart +
					((int)channel._volumeEnd - (int)channel._volumeStart) *
					(int)(currentTicks - channel._volumeChangeStart) / (int)channel._panRate;
			}

			debugC(DEBUG_DETAILED, kDebugCore, "qsWaveMixPump time=%u vol=%d",
				currentTicks, channel._volume);

			if (channel._volume != oldVolume && !channel._sounds.empty()
					&& channel._sounds.front()._started) {
				_mixer->setChannelVolume(channel._sounds.front()._soundHandle,
					channel.getRawVolume());
			}
		}

		// If the playing sound on the channel is finished, then call
		// the callback registered for it, and remove it from the list
		if (!channel._sounds.empty()) {
			SoundEntry &sound = channel._sounds.front();
			if (sound._started && !_mixer->isSoundHandleActive(sound._soundHandle)) {
				// Sound is finished
				if (sound._callback)
					// Call the callback to signal end
					sound._callback(iChannel, sound._waveFile, sound._userData);

				// Remove sound record from channel
				channel._sounds.erase(channel._sounds.begin());
			}
		}

		// If there's an unstarted sound at the front of a channel's
		// sound list, then start it playing
		if (!channel._sounds.empty()) {
			SoundEntry &sound = channel._sounds.front();
			if (!sound._started) {
				if (channel._resetDistance)
					channel._distance = 0.0;

				// Play the wave
				sound._soundHandle = sound._waveFile->play(
					sound._loops, channel.getRawVolume());
				sound._started = true;
			}
		}
	}
}

/*------------------------------------------------------------------------*/

byte QMixer::ChannelEntry::getRawVolume() const {
	// Emperically decided adjustment divisor for distances
	const double ADJUSTMENT_FACTOR = 5.0;

	double r = 1.0 + (_distance / ADJUSTMENT_FACTOR);
	double percent = 1.0 / (r * r);

	double newVolume = _volume * percent;
	return (byte)newVolume;
}

} // End of namespace Titanic