diff options
Diffstat (limited to 'src/main/java/com/jsyn/util/MultiChannelSynthesizer.java')
| -rw-r--r-- | src/main/java/com/jsyn/util/MultiChannelSynthesizer.java | 78 |
1 files changed, 56 insertions, 22 deletions
diff --git a/src/main/java/com/jsyn/util/MultiChannelSynthesizer.java b/src/main/java/com/jsyn/util/MultiChannelSynthesizer.java index da7f6c7..9044929 100644 --- a/src/main/java/com/jsyn/util/MultiChannelSynthesizer.java +++ b/src/main/java/com/jsyn/util/MultiChannelSynthesizer.java @@ -35,14 +35,15 @@ import com.softsynth.math.AudioMath; import com.softsynth.shared.time.TimeStamp; /** - * General purpose synthesizer with "channels" - * that could be used to implement a MIDI synthesizer. - * + * General purpose synthesizer with "channels" that could be used to implement a MIDI synthesizer. * Each channel has: - * <pre><code> + * + * <pre> + * <code> * lfo -> pitchToLinear -> [VOICES] -> volume* -> panner * bend --/ - * </code></pre> + * </code> + * </pre> * * Note: this class is experimental and subject to change. * @@ -53,6 +54,9 @@ public class MultiChannelSynthesizer { private TwoInDualOut outputUnit; private ChannelContext[] channels; private final static int MAX_VELOCITY = 127; + private final static int DEFAULT_RHYTHM_CHANNEL = 9; // known as channel "10" by musicians + // Use preset 128 as a special code to indicate that a voice is being used for rhythm. + private final static int RHYTHM_PRESET = 128; private double mMasterAmplitude = 0.25; private class ChannelGroupContext { @@ -69,7 +73,6 @@ public class MultiChannelSynthesizer { UnitGenerator ugen = voice.getUnitGenerator(); synth.add(ugen); voices[i] = voice; - } allocator = new VoiceAllocator(voices); } @@ -87,9 +90,20 @@ public class MultiChannelSynthesizer { private double bendRangeOctaves = 2.0 / 12.0; private int presetIndex; private ChannelGroupContext groupContext; + private int channelIndex; + private boolean rhythm; // Is this channel a drum channel or a melodic channel? + + ChannelContext(int channelIndex) { + this.channelIndex = channelIndex; + if (channelIndex == DEFAULT_RHYTHM_CHANNEL) { + rhythm = true; + presetIndex = RHYTHM_PRESET; + } + } + VoiceOperation voiceOperation = new VoiceOperation() { @Override - public void operate (UnitVoice voice) { + public void operate(UnitVoice voice) { voice.usePreset(presetIndex); connectVoice(voice); } @@ -98,8 +112,8 @@ public class MultiChannelSynthesizer { void setup(ChannelGroupContext groupContext) { this.groupContext = groupContext; synth.add(pitchToLinear = new PowerOfTwo()); - synth.add(lfo = new SineOscillator()); // TODO use a MorphingOscillator or switch - // between S&H etc. + synth.add(lfo = new SineOscillator()); + // TODO use a MorphingOscillator or switch between S&H etc. // Use a ramp to smooth out the timbre changes. // This helps reduce pops from changing filter cutoff too abruptly. synth.add(timbreRamp = new LinearRamp()); @@ -151,18 +165,31 @@ public class MultiChannelSynthesizer { } void programChange(int program) { - int programWrapped = program % groupContext.voiceDescription.getPresetCount(); - String name = groupContext.voiceDescription.getPresetNames()[programWrapped]; - //LOGGER.debug("Preset[" + program + "] = " + name); - presetIndex = programWrapped; + if (!rhythm) { + int programWrapped = program % groupContext.voiceDescription.getPresetCount(); + String name = groupContext.voiceDescription.getPresetNames()[programWrapped]; + // LOGGER.debug("Preset[" + program + "] = " + name); + presetIndex = programWrapped; + } + } + + /** + * Combine channel and noteNumber in case we are sharing a VoiceAllocator across multiple + * channels. + * + * @param noteNumber + * @return a tag that is unique per channel and note + */ + private int makeNoteTag(int noteNumber) { + return (channelIndex << 8) + noteNumber; } void noteOff(int noteNumber, double amplitude) { - groupContext.allocator.noteOff(noteNumber, synth.createTimeStamp()); + noteOff(noteNumber, amplitude, synth.createTimeStamp()); } void noteOff(int noteNumber, double amplitude, TimeStamp timeStamp) { - groupContext.allocator.noteOff(noteNumber, timeStamp); + groupContext.allocator.noteOff(makeNoteTag(noteNumber), timeStamp); } void noteOn(int noteNumber, double amplitude) { @@ -171,8 +198,8 @@ public class MultiChannelSynthesizer { void noteOn(int noteNumber, double amplitude, TimeStamp timeStamp) { double frequency = AudioMath.pitchToFrequency(noteNumber); - //LOGGER.debug("noteOn(noteNumber) -> " + frequency + " Hz"); - groupContext.allocator.noteOn(noteNumber, frequency, amplitude, voiceOperation, timeStamp); + groupContext.allocator.noteOn(makeNoteTag(noteNumber), frequency, amplitude, + voiceOperation, timeStamp); } public void setPitchBend(double offset) { @@ -228,11 +255,10 @@ public class MultiChannelSynthesizer { this(MidiConstants.MAX_CHANNELS); } - public MultiChannelSynthesizer(int maxChannels) { channels = new ChannelContext[maxChannels]; for (int i = 0; i < channels.length; i++) { - channels[i] = new ChannelContext(); + channels[i] = new ChannelContext(i); } } @@ -251,7 +277,8 @@ public class MultiChannelSynthesizer { if (outputUnit == null) { synth.add(outputUnit = new TwoInDualOut()); } - ChannelGroupContext groupContext = new ChannelGroupContext(voicesPerChannel, + int voicesPerChannelGroupContext = numChannels * voicesPerChannel; + ChannelGroupContext groupContext = new ChannelGroupContext(voicesPerChannelGroupContext, voiceDescription); for (int i = 0; i < numChannels; i++) { channels[startChannel + i].setup(groupContext); @@ -263,9 +290,9 @@ public class MultiChannelSynthesizer { channelContext.programChange(program); } - /** * Turn off a note. + * * @param channel * @param noteNumber * @param velocity between 0 and 127, will be scaled by masterAmplitude @@ -277,6 +304,7 @@ public class MultiChannelSynthesizer { /** * Turn off a note. + * * @param channel * @param noteNumber * @param amplitude between 0 and 1.0, will be scaled by masterAmplitude @@ -288,6 +316,7 @@ public class MultiChannelSynthesizer { /** * Turn off a note. + * * @param channel * @param noteNumber * @param amplitude between 0 and 1.0, will be scaled by masterAmplitude @@ -299,6 +328,7 @@ public class MultiChannelSynthesizer { /** * Turn on a note. + * * @param channel * @param noteNumber * @param velocity between 0 and 127, will be scaled by masterAmplitude @@ -310,6 +340,7 @@ public class MultiChannelSynthesizer { /** * Turn on a note. + * * @param channel * @param noteNumber * @param amplitude between 0 and 1.0, will be scaled by masterAmplitude @@ -321,6 +352,7 @@ public class MultiChannelSynthesizer { /** * Turn on a note. + * * @param channel * @param noteNumber * @param amplitude between 0 and 1.0, will be scaled by masterAmplitude @@ -337,7 +369,7 @@ public class MultiChannelSynthesizer { * @param offset ranges from -1.0 to +1.0 */ public void setPitchBend(int channel, double offset) { - //LOGGER.debug("setPitchBend[" + channel + "] = " + offset); + // LOGGER.debug("setPitchBend[" + channel + "] = " + offset); ChannelContext channelContext = channels[channel]; channelContext.setPitchBend(offset); } @@ -393,11 +425,13 @@ public class MultiChannelSynthesizer { /** * Set amplitude for a single voice when the velocity is 127. + * * @param masterAmplitude */ public void setMasterAmplitude(double masterAmplitude) { mMasterAmplitude = masterAmplitude; } + public double getMasterAmplitude() { return mMasterAmplitude; } |