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/* 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 "bladerunner/audio_mixer.h"
#include "bladerunner/bladerunner.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
#include "common/timer.h"
namespace BladeRunner {
AudioMixer::AudioMixer(BladeRunnerEngine *vm):
_vm(vm)
{
for (int i = 0; i < kChannels; i++) {
_channels[i].isPresent = false;
}
_vm->getTimerManager()->installTimerProc(timerCallback, (1000 / kUpdatesPerSecond) * 1000 , this, "BladeRunnerAudioMixerTimer");
}
AudioMixer::~AudioMixer() {
for (int i = 0; i < kChannels; i++) {
stop(i, 0);
}
_vm->getTimerManager()->removeTimerProc(timerCallback);
}
int AudioMixer::play(Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void (*endCallback)(int, void*), void *callbackData) {
Common::StackLock lock(_mutex);
int channel = -1;
int lowestPriority = 1000000;
int lowestPriorityChannel = -1;
for (int i = 0; i < kUsableChannels; i++) {
if (!_channels[i].isPresent) {
channel = i;
break;
}
if (_channels[i].priority < lowestPriority) {
lowestPriority = _channels[i].priority;
lowestPriorityChannel = i;
}
}
if (channel == -1) {
if (priority < lowestPriority) {
return -1;
}
stop(lowestPriorityChannel, 0);
channel = lowestPriorityChannel;
}
return playInChannel(channel, type, stream, priority, loop, volume, pan, endCallback, callbackData);
}
int AudioMixer::playMusic(Audio::RewindableAudioStream *stream, int volume, void(*endCallback)(int, void *), void *callbackData) {
Common::StackLock lock(_mutex);
return playInChannel(kMusicChannel, Audio::Mixer::kMusicSoundType, stream, 100, false, volume, 0, endCallback, callbackData);
}
void AudioMixer::stop(int channel, int time) {
Common::StackLock lock(_mutex);
if (_channels[channel].isPresent) {
if (time) {
adjustVolume(channel, 0, time);
} else {
_channels[channel].isPresent = false;
_vm->_mixer->stopHandle(_channels[channel].handle);
if (_channels[channel].endCallback != nullptr) {
_channels[channel].endCallback(channel, _channels[channel].callbackData);
}
}
}
}
int AudioMixer::playInChannel(int channel, Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void(*endCallback)(int, void *), void *callbackData) {
_channels[channel].isPresent = true;
_channels[channel].stream = stream;
_channels[channel].priority = priority;
_channels[channel].loop = loop;
_channels[channel].volume = volume;
_channels[channel].volumeTarget = 0;
_channels[channel].volumeDelta = 0;
_channels[channel].pan = pan;
_channels[channel].panTarget = 0;
_channels[channel].panDelta = 0;
_channels[channel].endCallback = endCallback;
_channels[channel].callbackData = callbackData;
Audio::AudioStream* audioStream = stream;
if (loop) {
audioStream = new Audio::LoopingAudioStream(stream, 0, DisposeAfterUse::YES);
}
_vm->_mixer->playStream(
type,
&_channels[channel].handle,
audioStream,
-1,
volume * 255 / 100,
pan * 127 / 100);
return channel;
}
bool AudioMixer::isActive(int channel) {
Common::StackLock lock(_mutex);
return _channels[channel].isPresent && _vm->_mixer->isSoundHandleActive(_channels[channel].handle);
}
void AudioMixer::timerCallback(void *self) {
((AudioMixer*)self)->tick();
}
void AudioMixer::adjustVolume(int channel, int newVolume, int time)
{
Common::StackLock lock(_mutex);
if (_channels[channel].isPresent) {
_channels[channel].volumeTarget = newVolume;
_channels[channel].volumeDelta = ((newVolume - _channels[channel].volume) / (time / 60.0f)) / (float)kUpdatesPerSecond;
}
}
void AudioMixer::adjustPan(int channel, int newPan, int time)
{
Common::StackLock lock(_mutex);
if (_channels[channel].isPresent) {
newPan = CLIP(newPan, -100, 100);
_channels[channel].panTarget = newPan;
_channels[channel].panDelta = ((newPan - _channels[channel].pan) / (time / 60.0f)) / (float)kUpdatesPerSecond;
}
}
void AudioMixer::tick()
{
Common::StackLock lock(_mutex);
for (int i = 0; i < kChannels; i++) {
Channel *channel = &_channels[i];
if (!channel->isPresent) {
continue;
}
if (channel->volumeDelta != 0.0f) {
channel->volume = CLIP(channel->volume + channel->volumeDelta, 0.0f, 100.0f);
if ((channel->volumeDelta < 0 && channel->volume <= channel->volumeTarget) || (channel->volumeDelta > 0 && channel->volume >= channel->volumeTarget)) {
channel->volumeDelta = 0.0f;
}
_vm->_mixer->setChannelVolume(channel->handle, channel->volume * 255 / 100);
if (channel->volume <= 0.0f) {
stop(i, 0);
}
}
if (channel->panDelta != 0.0) {
channel->pan = CLIP(channel->pan + channel->panDelta, -100.0f, 100.0f);
if ((channel->panDelta < 0 && channel->pan <= channel->panTarget) || (channel->panDelta > 0 && channel->pan >= channel->panTarget)) {
channel->panDelta = 0.0f;
}
_vm->_mixer->setChannelBalance(channel->handle, channel->pan * 127 / 100);
}
if (!_vm->_mixer->isSoundHandleActive(channel->handle) || channel->stream->endOfStream()) {
stop(i, 0);
}
}
}
} // End of namespace BladeRunner
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