添加一些关于midi播放的项目
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terryLP
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Copyright (c) 2010, Matt Westcott & Ben Firshman
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* The names of its contributors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# Midifile.js
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This module parses the Standard Midi File.
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The code was modified to adapt to the 'require' way of nodejs. Irrelevant code have been removed.
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The SMF parser part of the jasmid project is used. See jasmid's README and LICENSE for more info
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Jasmid's original repository: https://github.com/gasman/jasmid
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# JASMID Original Readme
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```
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jasmid - A Javascript MIDI file reader and synthesiser
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Originally presented at BarCamp London 8, 13-14 November 2010
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Instructions:
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Open index.html in browser. Turn up volume. Click on link.
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Sound output is via one of the following mechanisms, according to what your
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browser supports:
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* Mozilla Audio Data API <https://wiki.mozilla.org/Audio_Data_API>
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* Web Audio API
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<https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html>
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* a Flash fallback originally taken from dynamicaudio.js by Ben Firshman
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<https://github.com/bfirsh/dynamicaudio.js> and hacked around by me.
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The code:
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stream.js - helper library for reading a string as a stream of typed data
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midifile.js - parses the MIDI file format into a header and a list of tracks,
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each consisting of a list of event objects
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replayer.js - steps over the data structure generated by midifile.js and calls
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the appropriate operations on the synthesiser
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synth.js - audio synthesiser; generates waveforms according to tweakable
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parameters
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audio.js - passes the generated waveform to either the Audio Data API or the
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Flash fallback widget (da.swf)
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Limitations:
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* The only event types supported by replayer.js are note on, note off, tempo
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change and program change
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* There are currently only two instrument presets defined in synth.js - one for
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strings and a 'piano' one for everything else - and neither of them are
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particularly good (just a single volume-modulated sine wave).
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Matt Westcott <[email protected]> - @gasmanic - http://matt.west.co.tt/
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```
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// This file has been converted for node 'require'
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/*
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class to parse the .mid file format
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(depends on stream.js)
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*/
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var Stream = require("./stream.js");
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module.exports = function(data) {
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function readChunk(stream) {
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var id = stream.read(4);
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var length = stream.readInt32();
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return {
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'id': id,
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'length': length,
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'data': stream.read(length)
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};
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}
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var lastEventTypeByte;
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function readEvent(stream) {
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var event = {};
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event.deltaTime = stream.readVarInt();
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var eventTypeByte = stream.readInt8();
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if ((eventTypeByte & 0xf0) == 0xf0) {
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/* system / meta event */
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if (eventTypeByte == 0xff) {
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/* meta event */
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event.type = 'meta';
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var subtypeByte = stream.readInt8();
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var length = stream.readVarInt();
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switch(subtypeByte) {
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case 0x00:
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event.subtype = 'sequenceNumber';
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if (length != 2) throw "Expected length for sequenceNumber event is 2, got " + length;
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event.number = stream.readInt16();
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return event;
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case 0x01:
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event.subtype = 'text';
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event.text = stream.read(length);
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return event;
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case 0x02:
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event.subtype = 'copyrightNotice';
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event.text = stream.read(length);
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return event;
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case 0x03:
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event.subtype = 'trackName';
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event.text = stream.read(length);
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return event;
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case 0x04:
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event.subtype = 'instrumentName';
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event.text = stream.read(length);
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return event;
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case 0x05:
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event.subtype = 'lyrics';
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event.text = stream.read(length);
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return event;
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case 0x06:
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event.subtype = 'marker';
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event.text = stream.read(length);
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return event;
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case 0x07:
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event.subtype = 'cuePoint';
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event.text = stream.read(length);
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return event;
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case 0x20:
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event.subtype = 'midiChannelPrefix';
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if (length != 1) throw "Expected length for midiChannelPrefix event is 1, got " + length;
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event.channel = stream.readInt8();
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return event;
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case 0x2f:
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event.subtype = 'endOfTrack';
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if (length != 0) throw "Expected length for endOfTrack event is 0, got " + length;
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return event;
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case 0x51:
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event.subtype = 'setTempo';
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if (length != 3) throw "Expected length for setTempo event is 3, got " + length;
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event.microsecondsPerBeat = (
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(stream.readInt8() << 16)
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+ (stream.readInt8() << 8)
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+ stream.readInt8()
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)
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return event;
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case 0x54:
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event.subtype = 'smpteOffset';
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if (length != 5) throw "Expected length for smpteOffset event is 5, got " + length;
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var hourByte = stream.readInt8();
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event.frameRate = {
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0x00: 24, 0x20: 25, 0x40: 29, 0x60: 30
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}[hourByte & 0x60];
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event.hour = hourByte & 0x1f;
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event.min = stream.readInt8();
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event.sec = stream.readInt8();
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event.frame = stream.readInt8();
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event.subframe = stream.readInt8();
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return event;
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case 0x58:
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event.subtype = 'timeSignature';
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if (length != 4) throw "Expected length for timeSignature event is 4, got " + length;
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event.numerator = stream.readInt8();
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event.denominator = Math.pow(2, stream.readInt8());
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event.metronome = stream.readInt8();
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event.thirtyseconds = stream.readInt8();
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return event;
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case 0x59:
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event.subtype = 'keySignature';
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if (length != 2) throw "Expected length for keySignature event is 2, got " + length;
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event.key = stream.readInt8(true);
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event.scale = stream.readInt8();
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return event;
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case 0x7f:
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event.subtype = 'sequencerSpecific';
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event.data = stream.read(length);
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return event;
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default:
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// console.log("Unrecognised meta event subtype: " + subtypeByte);
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event.subtype = 'unknown'
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event.data = stream.read(length);
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return event;
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}
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event.data = stream.read(length);
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return event;
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} else if (eventTypeByte == 0xf0) {
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event.type = 'sysEx';
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var length = stream.readVarInt();
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event.data = stream.read(length);
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return event;
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} else if (eventTypeByte == 0xf7) {
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event.type = 'dividedSysEx';
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var length = stream.readVarInt();
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event.data = stream.read(length);
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return event;
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} else {
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throw "Unrecognised MIDI event type byte: " + eventTypeByte;
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}
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} else {
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/* channel event */
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var param1;
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if ((eventTypeByte & 0x80) == 0) {
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/* running status - reuse lastEventTypeByte as the event type.
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eventTypeByte is actually the first parameter
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*/
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param1 = eventTypeByte;
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eventTypeByte = lastEventTypeByte;
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} else {
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param1 = stream.readInt8();
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lastEventTypeByte = eventTypeByte;
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}
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var eventType = eventTypeByte >> 4;
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event.channel = eventTypeByte & 0x0f;
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event.type = 'channel';
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switch (eventType) {
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case 0x08:
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event.subtype = 'noteOff';
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event.noteNumber = param1;
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event.velocity = stream.readInt8();
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return event;
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case 0x09:
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event.noteNumber = param1;
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event.velocity = stream.readInt8();
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if (event.velocity == 0) {
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event.subtype = 'noteOff';
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} else {
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event.subtype = 'noteOn';
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}
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return event;
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case 0x0a:
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event.subtype = 'noteAftertouch';
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event.noteNumber = param1;
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event.amount = stream.readInt8();
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return event;
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case 0x0b:
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event.subtype = 'controller';
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event.controllerType = param1;
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event.value = stream.readInt8();
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return event;
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case 0x0c:
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event.subtype = 'programChange';
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event.programNumber = param1;
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return event;
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case 0x0d:
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event.subtype = 'channelAftertouch';
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event.amount = param1;
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return event;
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case 0x0e:
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event.subtype = 'pitchBend';
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event.value = param1 + (stream.readInt8() << 7);
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return event;
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default:
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throw "Unrecognised MIDI event type: " + eventType
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/*
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console.log("Unrecognised MIDI event type: " + eventType);
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stream.readInt8();
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event.subtype = 'unknown';
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return event;
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*/
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}
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}
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}
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stream = Stream(data);
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var headerChunk = readChunk(stream);
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if (headerChunk.id != 'MThd' || headerChunk.length != 6) {
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throw "Bad .mid file - header not found";
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}
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var headerStream = Stream(headerChunk.data);
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var formatType = headerStream.readInt16();
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var trackCount = headerStream.readInt16();
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var timeDivision = headerStream.readInt16();
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if (timeDivision & 0x8000) {
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throw "Expressing time division in SMTPE frames is not supported yet"
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} else {
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ticksPerBeat = timeDivision;
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}
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var header = {
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'formatType': formatType,
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'trackCount': trackCount,
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'ticksPerBeat': ticksPerBeat
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}
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var tracks = [];
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for (var i = 0; i < header.trackCount; i++) {
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tracks[i] = [];
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var trackChunk = readChunk(stream);
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if (trackChunk.id != 'MTrk') {
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throw "Unexpected chunk - expected MTrk, got "+ trackChunk.id;
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}
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var trackStream = Stream(trackChunk.data);
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while (!trackStream.eof()) {
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var event = readEvent(trackStream);
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tracks[i].push(event);
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//console.log(event);
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}
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}
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return {
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'header': header,
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'tracks': tracks
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}
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}
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@@ -0,0 +1,71 @@
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// This file has been converted for node 'require'
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/* Wrapper for accessing strings through sequential reads */
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module.exports = function(str) {
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var position = 0;
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function read(length) {
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var result = str.substr(position, length);
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position += length;
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return result;
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}
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/* read a big-endian 32-bit integer */
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function readInt32() {
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var result = (
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(str.charCodeAt(position) << 24)
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+ (str.charCodeAt(position + 1) << 16)
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+ (str.charCodeAt(position + 2) << 8)
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+ str.charCodeAt(position + 3));
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position += 4;
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return result;
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}
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/* read a big-endian 16-bit integer */
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function readInt16() {
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var result = (
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(str.charCodeAt(position) << 8)
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+ str.charCodeAt(position + 1));
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position += 2;
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return result;
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}
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/* read an 8-bit integer */
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function readInt8(signed) {
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var result = str.charCodeAt(position);
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if (signed && result > 127) result -= 256;
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position += 1;
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return result;
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}
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function eof() {
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return position >= str.length;
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}
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/* read a MIDI-style variable-length integer
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(big-endian value in groups of 7 bits,
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with top bit set to signify that another byte follows)
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*/
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function readVarInt() {
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var result = 0;
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while (true) {
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var b = readInt8();
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if (b & 0x80) {
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result += (b & 0x7f);
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result <<= 7;
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} else {
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/* b is the last byte */
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return result + b;
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}
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}
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}
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return {
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'eof': eof,
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'read': read,
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'readInt32': readInt32,
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'readInt16': readInt16,
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'readInt8': readInt8,
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'readVarInt': readVarInt
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}
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}
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