uk.org.toot.midi.core.channel
Interface MidiChannelWriter

All Known Implementing Classes:
DefaultMidiChannelWriter

public interface MidiChannelWriter


Method Summary
 void allNotesOff()
          Turns off all notes that are currently sounding on this channel.
 void allSoundOff()
          Immediately turns off all sounding notes on this channel, ignoring the state of the Hold Pedal and the internal decay rate of the current Instrument.
 void controlChange(int controller, int value)
          Reacts to a change in the specified controller's value.
 int getIndex()
           
 boolean localControl(boolean local)
          Turns local control on or off.
 void noteOff(int noteNumber)
          Turns the specified note off.
 void noteOff(int noteNumber, int velocity)
          Turns the specified note off.
 void noteOn(int noteNumber, int velocity)
          Starts the specified note sounding.
 void programChange(int program)
          Changes a program (patch).
 void programChange(int bank, int program)
          Changes the program using bank and program (patch) numbers.
 void resetAllControllers()
          Resets all the implemented controllers to their default values.
 void setChannelPressure(int channelPressure)
          Reacts to a change in the keyboard pressure.
 void setControl(int control, int value)
          Set the controller with the specified index to the specified value.
 void setMono(boolean mono)
          Turns mono mode on or off.
 void setMute(boolean mute)
          Sets the mute state for this channel.
 void setOmni(boolean omni)
          Turns omni mode on or off.
 void setPan(int pan)
           
 void setPitchBend(int pitchBend)
          Changes the pitch offset for all notes on this channel.
 void setPolyPressure(int noteNumber, int pressure)
          Reacts to a change in the specified note's key pressure.
 void setSolo(boolean solo)
          Sets the solo state for this channel.
 void setVolume(int volume)
           
 

Method Detail

setControl

void setControl(int control,
                int value)
Set the controller with the specified index to the specified value. This method determines whether the specified controller is 7 bit or 14 bit and results in one or two controlChange() calls as appropriate.


setSolo

void setSolo(boolean solo)
Sets the solo state for this channel. If solo is true only this channel and other soloed channels will sound. If solo is false then only other soloed channels will sound, unless no channels are soloed, in which case all unmuted channels will sound.

Parameters:
soloState - new solo state for the channel
See Also:
#getSolo, setMute(boolean)

getIndex

int getIndex()

setPitchBend

void setPitchBend(int pitchBend)
Changes the pitch offset for all notes on this channel. This affects all currently sounding notes as well as subsequent ones. (For pitch bend to cease, the value needs to be reset to the center position.)

The MIDI specification stipulates that pitch bend be a 14-bit value, where zero is maximum downward bend, 16383 is maximum upward bend, and 8192 is the center (no pitch bend). The actual amount of pitch change is not specified; it can be changed by a pitch-bend sensitivity setting. However, the General MIDI specification says that the default range should be two semitones up and down from center.

Parameters:
bend - the amount of pitch change, as a nonnegative 14-bit value (8192 = no bend)
See Also:
#getPitchBend

setChannelPressure

void setChannelPressure(int channelPressure)
Reacts to a change in the keyboard pressure. Channel pressure indicates how hard the keyboard player is depressing the entire keyboard. This can be the maximum or average of the per-key pressure-sensor values, as set by setPolyPressure. More commonly, it is a measurement of a single sensor on a device that doesn't implement polyphonic key pressure. Pressure can be used to control various aspects of the sound, as described under setPolyPressure.

Parameters:
pressure - the pressure with which the keyboard is being depressed, from 0 to 127 (127 = maximum pressure)
See Also:
setPolyPressure(int, int), #getChannelPressure

setVolume

void setVolume(int volume)

setPan

void setPan(int pan)

setMono

void setMono(boolean mono)
Turns mono mode on or off. In mono mode, the channel synthesizes only one note at a time. In poly mode (identical to mono mode off), the channel can synthesize multiple notes simultaneously. The default is mono off (poly mode on).

"Mono" is short for the word "monophonic," which in this context is opposed to the word "polyphonic" and refers to a single synthesizer voice per MIDI channel. It has nothing to do with how many audio channels there might be (as in "monophonic" versus "stereophonic" recordings).

Parameters:
on - true to turn mono mode on, false to turn it off (which means turning poly mode on).
See Also:
#getMono

setOmni

void setOmni(boolean omni)
Turns omni mode on or off. In omni mode, the channel responds to messages sent on all channels. When omni is off, the channel responds only to messages sent on its channel number. The default is omni off.

Parameters:
on - true to turn omni mode on, false to turn it off.
See Also:
#getOmni

setMute

void setMute(boolean mute)
Sets the mute state for this channel. A value of true means the channel is to be muted, false means the channel can sound (if other channels are not soloed).

Unlike allSoundOff(), this method applies to only a specific channel, not to all channels. Further, it silences not only currently sounding notes, but also subsequently received notes.

Parameters:
mute - the new mute state
See Also:
#getMute, setSolo(boolean)

noteOn

void noteOn(int noteNumber,
            int velocity)
Starts the specified note sounding. The key-down velocity usually controls the note's volume and/or brightness. If velocity is zero, this method instead acts like noteOff(int), terminating the note.

Parameters:
noteNumber - the MIDI note number, from 0 to 127 (60 = Middle C)
velocity - the speed with which the key was depressed
See Also:
noteOff(int, int)

noteOff

void noteOff(int noteNumber,
             int velocity)
Turns the specified note off. The key-up velocity, if not ignored, can be used to affect how quickly the note decays. In any case, the note might not die away instantaneously; its decay rate is determined by the internals of the Instrument. If the Hold Pedal (a controller; see controlChange) is down, the effect of this method is deferred until the pedal is released.

Parameters:
noteNumber - the MIDI note number, from 0 to 127 (60 = Middle C)
velocity - the speed with which the key was released
See Also:
noteOff(int), noteOn(int, int), allNotesOff(), allSoundOff()

noteOff

void noteOff(int noteNumber)
Turns the specified note off.

Parameters:
noteNumber - the MIDI note number, from 0 to 127 (60 = Middle C)
See Also:
noteOff(int, int)

setPolyPressure

void setPolyPressure(int noteNumber,
                     int pressure)
Reacts to a change in the specified note's key pressure. Polyphonic key pressure allows a keyboard player to press multiple keys simultaneously, each with a different amount of pressure. The pressure, if not ignored, is typically used to vary such features as the volume, brightness, or vibrato of the note.

Parameters:
noteNumber - the MIDI note number, from 0 to 127 (60 = Middle C)
pressure - value for the specified key, from 0 to 127 (127 = maximum pressure)
See Also:
#getPolyPressure(int)

controlChange

void controlChange(int controller,
                   int value)
Reacts to a change in the specified controller's value. A controller is some control other than a keyboard key, such as a switch, slider, pedal, wheel, or breath-pressure sensor. The MIDI 1.0 Specification provides standard numbers for typical controllers on MIDI devices, and describes the intended effect for some of the controllers. The way in which an Instrument reacts to a controller change may be specific to the Instrument.

The MIDI 1.0 Specification defines both 7-bit controllers and 14-bit controllers. Continuous controllers, such as wheels and sliders, typically have 14 bits (two MIDI bytes), while discrete controllers, such as switches, typically have 7 bits (one MIDI byte). Refer to the specification to see the expected resolution for each type of control.

Controllers 64 through 95 (0x40 - 0x5F) allow 7-bit precision. The value of a 7-bit controller is set completely by the value argument. An additional set of controllers provide 14-bit precision by using two controller numbers, one for the most significant 7 bits and another for the least significant 7 bits. Controller numbers 0 through 31 (0x00 - 0x1F) control the most significant 7 bits of 14-bit controllers; controller numbers 32 through 63 (0x20 - 0x3F) control the least significant 7 bits of these controllers. For example, controller number 7 (0x07) controls the upper 7 bits of the channel volume controller, and controller number 39 (0x27) controls the lower 7 bits. The value of a 14-bit controller is determined by the interaction of the two halves. When the most significant 7 bits of a controller are set (using controller numbers 0 through 31), the lower 7 bits are automatically set to 0. The corresponding controller number for the lower 7 bits may then be used to further modulate the controller value.

Parameters:
controller - the controller number (0 to 127; see the MIDI 1.0 Specification for the interpretation)
value - the value to which the specified controller is changed (0 to 127)
See Also:
#getController(int)

programChange

void programChange(int program)
Changes a program (patch). This selects a specific instrument from the currently selected bank of instruments.

The MIDI specification does not dictate whether notes that are already sounding should switch to the new instrument (timbre) or continue with their original timbre until terminated by a note-off.

The program number is zero-based (expressed from 0 to 127). Note that MIDI hardware displays and literature about MIDI typically use the range 1 to 128 instead.

Parameters:
program - the program number to switch to (0 to 127)
See Also:
programChange(int, int), #getProgram()

programChange

void programChange(int bank,
                   int program)
Changes the program using bank and program (patch) numbers.

Parameters:
bank - the bank number to switch to (0 to 16383)
program - the program (patch) to use in the specified bank (0 to 127)
See Also:
programChange(int), #getProgram()

resetAllControllers

void resetAllControllers()
Resets all the implemented controllers to their default values.

See Also:
controlChange(int, int)

allNotesOff

void allNotesOff()
Turns off all notes that are currently sounding on this channel. The notes might not die away instantaneously; their decay rate is determined by the internals of the Instrument. If the Hold Pedal controller (see controlChange) is down, the effect of this method is deferred until the pedal is released.

See Also:
allSoundOff(), noteOff(int)

allSoundOff

void allSoundOff()
Immediately turns off all sounding notes on this channel, ignoring the state of the Hold Pedal and the internal decay rate of the current Instrument.

See Also:
allNotesOff()

localControl

boolean localControl(boolean local)
Turns local control on or off. The default is for local control to be on. The "on" setting means that if a device is capable of both synthesizing sound and transmitting MIDI messages, it will synthesize sound in response to the note-on and note-off messages that it itself transmits. It will also respond to messages received from other transmitting devices. The "off" setting means that the synthesizer will ignore its own transmitted MIDI messages, but not those received from other devices.

Parameters:
local - true to turn local control on, false to turn local control off
Returns:
the new local-control value


Copyright © 2004, 2005, 2006, 2007 Steve Taylor. All Rights Reserved.