diff options
Diffstat (limited to 'src/http/static/trading-in-the-rain/MIDI.js/js/midi/plugin.audiotag.js')
| -rw-r--r-- | src/http/static/trading-in-the-rain/MIDI.js/js/midi/plugin.audiotag.js | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/http/static/trading-in-the-rain/MIDI.js/js/midi/plugin.audiotag.js b/src/http/static/trading-in-the-rain/MIDI.js/js/midi/plugin.audiotag.js new file mode 100644 index 0000000..ec361c6 --- /dev/null +++ b/src/http/static/trading-in-the-rain/MIDI.js/js/midi/plugin.audiotag.js @@ -0,0 +1,150 @@ +/* + ---------------------------------------------------------------------- + AudioTag <audio> - OGG or MPEG Soundbank + ---------------------------------------------------------------------- + http://dev.w3.org/html5/spec/Overview.html#the-audio-element + ---------------------------------------------------------------------- +*/ + +(function(root) { 'use strict'; + + window.Audio && (function() { + var midi = root.AudioTag = { api: 'audiotag' }; + var noteToKey = {}; + var volume = 127; // floating point + var buffer_nid = -1; // current channel + var audioBuffers = []; // the audio channels + var notesOn = []; // instrumentId + noteId that is currently playing in each 'channel', for routing noteOff/chordOff calls + var notes = {}; // the piano keys + for (var nid = 0; nid < 12; nid ++) { + audioBuffers[nid] = new Audio(); + } + + var playChannel = function(channel, note) { + if (!root.channels[channel]) return; + var instrument = root.channels[channel].instrument; + var instrumentId = root.GM.byId[instrument].id; + var note = notes[note]; + if (note) { + var instrumentNoteId = instrumentId + '' + note.id; + var nid = (buffer_nid + 1) % audioBuffers.length; + var audio = audioBuffers[nid]; + notesOn[ nid ] = instrumentNoteId; + if (!root.Soundfont[instrumentId]) { + if (root.DEBUG) { + console.log('404', instrumentId); + } + return; + } + audio.src = root.Soundfont[instrumentId][note.id]; + audio.volume = volume / 127; + audio.play(); + buffer_nid = nid; + } + }; + + var stopChannel = function(channel, note) { + if (!root.channels[channel]) return; + var instrument = root.channels[channel].instrument; + var instrumentId = root.GM.byId[instrument].id; + var note = notes[note]; + if (note) { + var instrumentNoteId = instrumentId + '' + note.id; + for (var i = 0, len = audioBuffers.length; i < len; i++) { + var nid = (i + buffer_nid + 1) % len; + var cId = notesOn[nid]; + if (cId && cId == instrumentNoteId) { + audioBuffers[nid].pause(); + notesOn[nid] = null; + return; + } + } + } + }; + + midi.audioBuffers = audioBuffers; + midi.send = function(data, delay) { }; + midi.setController = function(channel, type, value, delay) { }; + midi.setVolume = function(channel, n) { + volume = n; //- should be channel specific volume + }; + + midi.programChange = function(channel, program) { + root.channels[channel].instrument = program; + }; + + midi.pitchBend = function(channel, program, delay) { }; + + midi.noteOn = function(channel, note, velocity, delay) { + var id = noteToKey[note]; + if (!notes[id]) return; + if (delay) { + return setTimeout(function() { + playChannel(channel, id); + }, delay * 1000); + } else { + playChannel(channel, id); + } + }; + + midi.noteOff = function(channel, note, delay) { +// var id = noteToKey[note]; +// if (!notes[id]) return; +// if (delay) { +// return setTimeout(function() { +// stopChannel(channel, id); +// }, delay * 1000) +// } else { +// stopChannel(channel, id); +// } + }; + + midi.chordOn = function(channel, chord, velocity, delay) { + for (var idx = 0; idx < chord.length; idx ++) { + var n = chord[idx]; + var id = noteToKey[n]; + if (!notes[id]) continue; + if (delay) { + return setTimeout(function() { + playChannel(channel, id); + }, delay * 1000); + } else { + playChannel(channel, id); + } + } + }; + + midi.chordOff = function(channel, chord, delay) { + for (var idx = 0; idx < chord.length; idx ++) { + var n = chord[idx]; + var id = noteToKey[n]; + if (!notes[id]) continue; + if (delay) { + return setTimeout(function() { + stopChannel(channel, id); + }, delay * 1000); + } else { + stopChannel(channel, id); + } + } + }; + + midi.stopAllNotes = function() { + for (var nid = 0, length = audioBuffers.length; nid < length; nid++) { + audioBuffers[nid].pause(); + } + }; + + midi.connect = function(opts) { + root.setDefaultPlugin(midi); + /// + for (var key in root.keyToNote) { + noteToKey[root.keyToNote[key]] = key; + notes[key] = {id: key}; + } + /// + opts.onsuccess && opts.onsuccess(); + }; + })(); + +})(MIDI);
\ No newline at end of file |