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delete mid.js

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ckcz123 2020-05-23 10:45:10 +08:00
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commit 34e4a5130e
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29
libs/thirdparty/LICENSE.md vendored
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@ -229,35 +229,6 @@ localforage
See the License for the specific language governing permissions and See the License for the specific language governing permissions and
limitations under the License. limitations under the License.
mid
============
Copyright (c) 2010, Matt Westcott & Ben Firshman
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* The names of its contributors may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
zip zip
============ ============

701
libs/thirdparty/mid.js vendored
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@ -1,701 +0,0 @@
var sampleRate = 44100; /* hard-coded in Flash player */
function AudioPlayer(context, generator, loop) {
// Uses Webkit Web Audio API if available
sampleRate = context.sampleRate;
var channelCount = 2;
var bufferSize = 4096*4; // Higher for less gitches, lower for less latency
var node = context.createScriptProcessor(bufferSize, 0, channelCount);
node.onaudioprocess = function(e) { process(e) };
function process(e) {
if (generator.finished) {
if (loop) {
generator.reset();
generator.finished = false;
}
else {
node.disconnect();
return;
}
}
var dataLeft = e.outputBuffer.getChannelData(0);
var dataRight = e.outputBuffer.getChannelData(1);
var generate = generator.generate(bufferSize);
for (var i = 0; i < bufferSize; ++i) {
dataLeft[i] = generate[i*2];
dataRight[i] = generate[i*2+1];
}
}
// start
// node.connect(context.destination);
return {
'play': function () {
node.connect(context.destination);
},
'pause': function() {
node.disconnect();
}
}
}
/*
class to parse the .mid file format
(depends on stream.js)
*/
function MidiFile(data) {
function readChunk(stream) {
var id = stream.read(4);
var length = stream.readInt32();
return {
'id': id,
'length': length,
'data': stream.read(length)
};
}
var lastEventTypeByte;
function readEvent(stream) {
var event = {};
event.deltaTime = stream.readVarInt();
var eventTypeByte = stream.readInt8();
if ((eventTypeByte & 0xf0) == 0xf0) {
/* system / meta event */
if (eventTypeByte == 0xff) {
/* meta event */
event.type = 'meta';
var subtypeByte = stream.readInt8();
var length = stream.readVarInt();
switch(subtypeByte) {
case 0x00:
event.subtype = 'sequenceNumber';
if (length != 2) throw "Expected length for sequenceNumber event is 2, got " + length;
event.number = stream.readInt16();
return event;
case 0x01:
event.subtype = 'text';
event.text = stream.read(length);
return event;
case 0x02:
event.subtype = 'copyrightNotice';
event.text = stream.read(length);
return event;
case 0x03:
event.subtype = 'trackName';
event.text = stream.read(length);
return event;
case 0x04:
event.subtype = 'instrumentName';
event.text = stream.read(length);
return event;
case 0x05:
event.subtype = 'lyrics';
event.text = stream.read(length);
return event;
case 0x06:
event.subtype = 'marker';
event.text = stream.read(length);
return event;
case 0x07:
event.subtype = 'cuePoint';
event.text = stream.read(length);
return event;
case 0x20:
event.subtype = 'midiChannelPrefix';
if (length != 1) throw "Expected length for midiChannelPrefix event is 1, got " + length;
event.channel = stream.readInt8();
return event;
case 0x2f:
event.subtype = 'endOfTrack';
if (length != 0) throw "Expected length for endOfTrack event is 0, got " + length;
return event;
case 0x51:
event.subtype = 'setTempo';
if (length != 3) throw "Expected length for setTempo event is 3, got " + length;
event.microsecondsPerBeat = (
(stream.readInt8() << 16)
+ (stream.readInt8() << 8)
+ stream.readInt8()
)
return event;
case 0x54:
event.subtype = 'smpteOffset';
if (length != 5) throw "Expected length for smpteOffset event is 5, got " + length;
var hourByte = stream.readInt8();
event.frameRate = {
0x00: 24, 0x20: 25, 0x40: 29, 0x60: 30
}[hourByte & 0x60];
event.hour = hourByte & 0x1f;
event.min = stream.readInt8();
event.sec = stream.readInt8();
event.frame = stream.readInt8();
event.subframe = stream.readInt8();
return event;
case 0x58:
event.subtype = 'timeSignature';
if (length != 4) throw "Expected length for timeSignature event is 4, got " + length;
event.numerator = stream.readInt8();
event.denominator = Math.pow(2, stream.readInt8());
event.metronome = stream.readInt8();
event.thirtyseconds = stream.readInt8();
return event;
case 0x59:
event.subtype = 'keySignature';
if (length != 2) throw "Expected length for keySignature event is 2, got " + length;
event.key = stream.readInt8(true);
event.scale = stream.readInt8();
return event;
case 0x7f:
event.subtype = 'sequencerSpecific';
event.data = stream.read(length);
return event;
default:
// console.log("Unrecognised meta event subtype: " + subtypeByte);
event.subtype = 'unknown'
event.data = stream.read(length);
return event;
}
event.data = stream.read(length);
return event;
} else if (eventTypeByte == 0xf0) {
event.type = 'sysEx';
var length = stream.readVarInt();
event.data = stream.read(length);
return event;
} else if (eventTypeByte == 0xf7) {
event.type = 'dividedSysEx';
var length = stream.readVarInt();
event.data = stream.read(length);
return event;
} else {
throw "Unrecognised MIDI event type byte: " + eventTypeByte;
}
} else {
/* channel event */
var param1;
if ((eventTypeByte & 0x80) == 0) {
/* running status - reuse lastEventTypeByte as the event type.
eventTypeByte is actually the first parameter
*/
param1 = eventTypeByte;
eventTypeByte = lastEventTypeByte;
} else {
param1 = stream.readInt8();
lastEventTypeByte = eventTypeByte;
}
var eventType = eventTypeByte >> 4;
event.channel = eventTypeByte & 0x0f;
event.type = 'channel';
switch (eventType) {
case 0x08:
event.subtype = 'noteOff';
event.noteNumber = param1;
event.velocity = stream.readInt8();
return event;
case 0x09:
event.noteNumber = param1;
event.velocity = stream.readInt8();
if (event.velocity == 0) {
event.subtype = 'noteOff';
} else {
event.subtype = 'noteOn';
}
return event;
case 0x0a:
event.subtype = 'noteAftertouch';
event.noteNumber = param1;
event.amount = stream.readInt8();
return event;
case 0x0b:
event.subtype = 'controller';
event.controllerType = param1;
event.value = stream.readInt8();
return event;
case 0x0c:
event.subtype = 'programChange';
event.programNumber = param1;
return event;
case 0x0d:
event.subtype = 'channelAftertouch';
event.amount = param1;
return event;
case 0x0e:
event.subtype = 'pitchBend';
event.value = param1 + (stream.readInt8() << 7);
return event;
default:
throw "Unrecognised MIDI event type: " + eventType
}
}
}
stream = Stream(data);
var headerChunk = readChunk(stream);
if (headerChunk.id != 'MThd' || headerChunk.length != 6) {
throw "Bad .mid file - header not found";
}
var headerStream = Stream(headerChunk.data);
var formatType = headerStream.readInt16();
var trackCount = headerStream.readInt16();
var timeDivision = headerStream.readInt16();
if (timeDivision & 0x8000) {
throw "Expressing time division in SMTPE frames is not supported yet"
} else {
ticksPerBeat = timeDivision;
}
var header = {
'formatType': formatType,
'trackCount': trackCount,
'ticksPerBeat': ticksPerBeat
}
var tracks = [];
for (var i = 0; i < header.trackCount; i++) {
tracks[i] = [];
var trackChunk = readChunk(stream);
if (trackChunk.id != 'MTrk') {
throw "Unexpected chunk - expected MTrk, got "+ trackChunk.id;
}
var trackStream = Stream(trackChunk.data);
while (!trackStream.eof()) {
var event = readEvent(trackStream);
tracks[i].push(event);
//console.log(event);
}
}
return {
'header': header,
'tracks': tracks
}
}
function Replayer(midiFile, synth) {
var trackStates = [];
var beatsPerMinute = 120;
var ticksPerBeat = midiFile.header.ticksPerBeat;
var channelCount = 16;
var channels = [];
var nextEventInfo;
var samplesToNextEvent;
function Channel() {
var generatorsByNote = {};
var currentProgram = PianoProgram;
function noteOn(note, velocity) {
if (generatorsByNote[note] && !generatorsByNote[note].released) {
/* playing same note before releasing the last one. BOO */
generatorsByNote[note].noteOff(); /* TODO: check whether we ought to be passing a velocity in */
}
generator = currentProgram.createNote(note, velocity);
synth.addGenerator(generator);
generatorsByNote[note] = generator;
}
function noteOff(note, velocity) {
if (generatorsByNote[note] && !generatorsByNote[note].released) {
generatorsByNote[note].noteOff(velocity);
}
}
function setProgram(programNumber) {
currentProgram = PROGRAMS[programNumber] || PianoProgram;
}
return {
'noteOn': noteOn,
'noteOff': noteOff,
'setProgram': setProgram
}
}
function getNextEvent() {
var ticksToNextEvent = null;
var nextEventTrack = null;
var nextEventIndex = null;
for (var i = 0; i < trackStates.length; i++) {
if (
trackStates[i].ticksToNextEvent != null
&& (ticksToNextEvent == null || trackStates[i].ticksToNextEvent < ticksToNextEvent)
) {
ticksToNextEvent = trackStates[i].ticksToNextEvent;
nextEventTrack = i;
nextEventIndex = trackStates[i].nextEventIndex;
}
}
if (nextEventTrack != null) {
/* consume event from that track */
var nextEvent = midiFile.tracks[nextEventTrack][nextEventIndex];
if (midiFile.tracks[nextEventTrack][nextEventIndex + 1]) {
trackStates[nextEventTrack].ticksToNextEvent += midiFile.tracks[nextEventTrack][nextEventIndex + 1].deltaTime;
} else {
trackStates[nextEventTrack].ticksToNextEvent = null;
}
trackStates[nextEventTrack].nextEventIndex += 1;
/* advance timings on all tracks by ticksToNextEvent */
for (var i = 0; i < trackStates.length; i++) {
if (trackStates[i].ticksToNextEvent != null) {
trackStates[i].ticksToNextEvent -= ticksToNextEvent
}
}
nextEventInfo = {
'ticksToEvent': ticksToNextEvent,
'event': nextEvent,
'track': nextEventTrack
}
var beatsToNextEvent = ticksToNextEvent / ticksPerBeat;
var secondsToNextEvent = beatsToNextEvent / (beatsPerMinute / 60);
samplesToNextEvent += secondsToNextEvent * synth.sampleRate;
} else {
nextEventInfo = null;
samplesToNextEvent = null;
self.finished = true;
}
}
function generate(samples) {
var data = new Array(samples*2);
var samplesRemaining = samples;
var dataOffset = 0;
while (true) {
if (samplesToNextEvent != null && samplesToNextEvent <= samplesRemaining) {
/* generate samplesToNextEvent samples, process event and repeat */
var samplesToGenerate = Math.ceil(samplesToNextEvent);
if (samplesToGenerate > 0) {
synth.generateIntoBuffer(samplesToGenerate, data, dataOffset);
dataOffset += samplesToGenerate * 2;
samplesRemaining -= samplesToGenerate;
samplesToNextEvent -= samplesToGenerate;
}
handleEvent();
getNextEvent();
} else {
/* generate samples to end of buffer */
if (samplesRemaining > 0) {
synth.generateIntoBuffer(samplesRemaining, data, dataOffset);
samplesToNextEvent -= samplesRemaining;
}
break;
}
}
return data;
}
function handleEvent() {
var event = nextEventInfo.event;
switch (event.type) {
case 'meta':
switch (event.subtype) {
case 'setTempo':
beatsPerMinute = 60000000 / event.microsecondsPerBeat
}
break;
case 'channel':
switch (event.subtype) {
case 'noteOn':
channels[event.channel].noteOn(event.noteNumber, event.velocity);
break;
case 'noteOff':
channels[event.channel].noteOff(event.noteNumber, event.velocity);
break;
case 'programChange':
//console.log('program change to ' + event.programNumber);
channels[event.channel].setProgram(event.programNumber);
break;
}
break;
}
}
function reset() {
for (var i = 0; i < midiFile.tracks.length; i++) {
trackStates[i] = {
'nextEventIndex': 0,
'ticksToNextEvent': (
midiFile.tracks[i].length ?
midiFile.tracks[i][0].deltaTime :
null
)
};
}
for (var i = 0; i < channelCount; i++) {
channels[i] = Channel();
}
samplesToNextEvent = 0;
getNextEvent();
}
reset();
var self = {
'reset': reset,
'generate': generate,
'finished': false
}
return self;
}
/* Wrapper for accessing strings through sequential reads */
function Stream(str) {
var position = 0;
function read(length) {
var result = str.substr(position, length);
position += length;
return result;
}
/* read a big-endian 32-bit integer */
function readInt32() {
var result = (
(str.charCodeAt(position) << 24)
+ (str.charCodeAt(position + 1) << 16)
+ (str.charCodeAt(position + 2) << 8)
+ str.charCodeAt(position + 3));
position += 4;
return result;
}
/* read a big-endian 16-bit integer */
function readInt16() {
var result = (
(str.charCodeAt(position) << 8)
+ str.charCodeAt(position + 1));
position += 2;
return result;
}
/* read an 8-bit integer */
function readInt8(signed) {
var result = str.charCodeAt(position);
if (signed && result > 127) result -= 256;
position += 1;
return result;
}
function eof() {
return position >= str.length;
}
/* read a MIDI-style variable-length integer
(big-endian value in groups of 7 bits,
with top bit set to signify that another byte follows)
*/
function readVarInt() {
var result = 0;
while (true) {
var b = readInt8();
if (b & 0x80) {
result += (b & 0x7f);
result <<= 7;
} else {
/* b is the last byte */
return result + b;
}
}
}
return {
'eof': eof,
'read': read,
'readInt32': readInt32,
'readInt16': readInt16,
'readInt8': readInt8,
'readVarInt': readVarInt
}
}
function SineGenerator(freq) {
var self = {'alive': true};
var period = sampleRate / freq;
var t = 0;
self.generate = function(buf, offset, count) {
for (; count; count--) {
var phase = t / period;
var result = Math.sin(phase * 2 * Math.PI);
buf[offset++] += result;
buf[offset++] += result;
t++;
}
}
return self;
}
function SquareGenerator(freq, phase) {
var self = {'alive': true};
var period = sampleRate / freq;
var t = 0;
self.generate = function(buf, offset, count) {
for (; count; count--) {
var result = ( (t / period) % 1 > phase ? 1 : -1);
buf[offset++] += result;
buf[offset++] += result;
t++;
}
}
return self;
}
function ADSRGenerator(child, attackAmplitude, sustainAmplitude, attackTimeS, decayTimeS, releaseTimeS) {
var self = {'alive': true}
var attackTime = sampleRate * attackTimeS;
var decayTime = sampleRate * (attackTimeS + decayTimeS);
var decayRate = (attackAmplitude - sustainAmplitude) / (decayTime - attackTime);
var releaseTime = null; /* not known yet */
var endTime = null; /* not known yet */
var releaseRate = sustainAmplitude / (sampleRate * releaseTimeS);
var t = 0;
self.noteOff = function() {
if (self.released) return;
releaseTime = t;
self.released = true;
endTime = releaseTime + sampleRate * releaseTimeS;
}
self.generate = function(buf, offset, count) {
if (!self.alive) return;
var input = new Array(count * 2);
for (var i = 0; i < count*2; i++) {
input[i] = 0;
}
child.generate(input, 0, count);
childOffset = 0;
while(count) {
if (releaseTime != null) {
if (t < endTime) {
/* release */
while(count && t < endTime) {
var ampl = sustainAmplitude - releaseRate * (t - releaseTime);
buf[offset++] += input[childOffset++] * ampl;
buf[offset++] += input[childOffset++] * ampl;
t++;
count--;
}
} else {
/* dead */
self.alive = false;
return;
}
} else if (t < attackTime) {
/* attack */
while(count && t < attackTime) {
var ampl = attackAmplitude * t / attackTime;
buf[offset++] += input[childOffset++] * ampl;
buf[offset++] += input[childOffset++] * ampl;
t++;
count--;
}
} else if (t < decayTime) {
/* decay */
while(count && t < decayTime) {
var ampl = attackAmplitude - decayRate * (t - attackTime);
buf[offset++] += input[childOffset++] * ampl;
buf[offset++] += input[childOffset++] * ampl;
t++;
count--;
}
} else {
/* sustain */
while(count) {
buf[offset++] += input[childOffset++] * sustainAmplitude;
buf[offset++] += input[childOffset++] * sustainAmplitude;
t++;
count--;
}
}
}
}
return self;
}
function midiToFrequency(note) {
return 440 * Math.pow(2, (note-69)/12);
}
PianoProgram = {
'attackAmplitude': 0.2,
'sustainAmplitude': 0.1,
'attackTime': 0.02,
'decayTime': 0.3,
'releaseTime': 0.02,
'createNote': function(note, velocity) {
var frequency = midiToFrequency(note);
return ADSRGenerator(
SineGenerator(frequency),
this.attackAmplitude * (velocity / 128), this.sustainAmplitude * (velocity / 128),
this.attackTime, this.decayTime, this.releaseTime
);
}
}
StringProgram = {
'createNote': function(note, velocity) {
var frequency = midiToFrequency(note);
return ADSRGenerator(
SineGenerator(frequency),
0.5 * (velocity / 128), 0.2 * (velocity / 128),
0.4, 0.8, 0.4
);
}
}
PROGRAMS = {
41: StringProgram,
42: StringProgram,
43: StringProgram,
44: StringProgram,
45: StringProgram,
46: StringProgram,
47: StringProgram,
49: StringProgram,
50: StringProgram
};
function Synth(sampleRate) {
var generators = [];
function addGenerator(generator) {
generators.push(generator);
}
function generate(samples) {
var data = new Array(samples*2);
generateIntoBuffer(samples, data, 0);
return data;
}
function generateIntoBuffer(samplesToGenerate, buffer, offset) {
for (var i = offset; i < offset + samplesToGenerate * 2; i++) {
buffer[i] = 0;
}
for (var i = generators.length - 1; i >= 0; i--) {
generators[i].generate(buffer, offset, samplesToGenerate);
if (!generators[i].alive) generators.splice(i, 1);
}
}
return {
'sampleRate': sampleRate,
'addGenerator': addGenerator,
'generate': generate,
'generateIntoBuffer': generateIntoBuffer
}
}

1
libs/thirdparty/mid.min.js vendored
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