Class CompositeMusicGenerator

java.lang.Object
org.jjazz.rhythmmusicgeneration.api.CompositeMusicGenerator
All Implemented Interfaces:
MusicGenerator
public class CompositeMusicGenerator extends Object implements MusicGenerator
A MusicGenerator which delegates to other destination MusicGenerators.

Delegation mechanism is configured via the RvToDelegateUnitMapper class.

This lets a base Rhythm instance use more than one MusicGenerator, for example :
- use an internal MusicGenerator for the bass RhythmVoice and another internal one for the rest of the RhythmVoices
- use 2 internal MusicGenerators for the bass RhythmVoice, depending on the SongPart's RP_SYS_Variation value
- use the percussion MusicGenerator from another Rhythm instance for our drums
- use the Main-C bass track from another Rhythm with note velocities lowered so it better fits the other tracks of the base rhythm

  • Constructor Details

  • Method Details

    • getBaseRhythm

      public Rhythm getBaseRhythm()

    • generateMusic

      public Map<RhythmVoice,Phrase> generateMusic(SongContext sgContext, RhythmVoice... rvs) throws MusicGenerationException
      Description copied from interface: MusicGenerator
      Generate the note Phrases which correspond to a musical accompaniment for a given rhythm.

      The service provider must compute one Phrase per RhythmVoice/Midi channel. The MidiMix from context provides the Midi channel associated to each RhythmVoice via MidiMix.getChannel(RhythmVoice). Phrases must be provided for all RhythmVoices (though a Phrase can be empty), including for the possible RhythmVoiceDelegates used by the Rhythm.

      If the context song contains several rhythms, the method must add notes ONLY for bars which use this MusicGenerator's rhythm. For example, if context range is bars 3-4 with rhythm1 on bar3 and rhythm2 on bar4, then the rhythm1 generator must add notes for bar 3 only.

      IMPORTANT: the following features are directly managed by the JJazzLab framework, notably by postprocessing the output of generateMusic():
      - Midi Instrument selection and settings (Program changes, Midi controller messages such as bank select, volume, reverb, panoramic)
      - RP_SYS_Mute rhythm parameter handling (muting a specific track for a specific SongPart)
      - RP_SYS_DrumsMix rhythm parameter handling (adjusting some drums track instruments velocity)
      - RP_SYS_CustomPhrase rhythm parameter handling (substitute a user-supplied phrase for a rhythm track)
      - RP_STD_Fill rhythm parameter handling for the "fade_out" value (MusicGenerator must handle the other values)
      - Handling of the channel's specific velocity shift
      - Handling of the instrument's specific transposition
      - Drums channel rerouting
      - NC chord symbols (produce no sound)

      Specified by:
      generateMusic in interface MusicGenerator
      Parameters:
      sgContext - The information to be used for music generation
      rvs - Generate music only for these RhythmVoices, or for all RhythmVoices if nothing specified
      Returns:
      One Phrase per rhythm voice/channel.
      Throws:
      MusicGenerationException - If generator could not produce the expected music for some reason.