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app.js
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app.js
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// 用这种方式(原始构造函数)的原因：解耦太难了，不解了。this全部指同一个
// 防止在html初始化之前getElement，所以封装成了构造函数，而不是直接写obj
function App() {
this.event = new EventTarget();
this.spectrum = document.getElementById('spectrum');
this.spectrum.ctx = this.spectrum.getContext('2d'); // 绘制相关参数的更改在this.resize中
this.keyboard = document.getElementById('piano');
this.keyboard.ctx = this.keyboard.getContext('2d', { alpha: false, desynchronized: true });
this.timeBar = document.getElementById('timeBar');
this.timeBar.ctx = this.timeBar.getContext('2d', { alpha: false, desynchronized: true });
this.midiMode = false;
this._width = 5; // 每格的宽度
Object.defineProperty(this, 'width', {
get: function () { return this._width; },
set: function (w) {
if (w <= 0) return;
this._width = w;
this.TimeBar.updateInterval();
this.HscrollBar.refreshSize(); // 刷新横向滑动条
this.TperP = this.dt / this._width; // 每个像素代表的时间
this.PperT = this._width / this.dt; // 每个时间代表的像素
}
});
this._height = 15; // 每格的高度
Object.defineProperty(this, 'height', {
get: function () { return this._height; },
set: function (h) {
if (h <= 0) return;
this._height = h;
this.Keyboard._ychange.set([
-1.5 * h, -2 * h, -1.5 * h, -1.5 * h, -2 * h, -2 * h, -1.5 * h,
-2 * h, -3 * h, -2 * h, -2 * h, -2 * h
]);
this.keyboard.ctx.font = `${h + 2}px Arial`;
this.spectrum.ctx.font = `${h}px Arial`;
}
});
this.ynum = 84; // 一共84个按键
this._xnum = 0; // 时间轴的最大长度
Object.defineProperty(this, 'xnum', { // midi模式下需要经常改变此值，故特设setter
get: function () { return this._xnum; },
set: function (n) {
if (n <= 0) return;
this._xnum = n;
this.HscrollBar.refreshSize(); // 刷新横向滑动条
this.idXend = Math.min(this._xnum, Math.ceil((this.scrollX + this.spectrum.width) / this._width));
}
});
this.scrollX = 0; // 视野左边和世界左边的距离
this.scrollY = 0; // 视野下边和世界下边的距离
this.idXstart = 0; // 开始的X序号
this.idYstart = 0; // 开始的Y序号
this.idXend = 0; // 在scroll2中更新
this.idYend = 0;
this.rectXstart = 0;// 目前只有Spectrogram.update在使用
this.rectYstart = 0;// 画布开始的具体y坐标(因为最下面一个不完整) 迭代应该减height 被画频谱、画键盘共享
this.loop = 0; // 接收requestAnimationFrame的返回
this.time = -1; // 当前时间 单位：毫秒 在this.AudioPlayer.update中更新
this.dt = 50; // 每次分析的时间间隔 单位毫秒 在this.Analyser.analyse中更新
this._mouseY = 0; // 鼠标当前y坐标
Object.defineProperty(this, 'mouseY', {
get: function () { return this._mouseY; },
set: function (y) {
this._mouseY = y;
this.Keyboard.highlight = Math.floor((this.scrollY + this.spectrum.height - y) / this._height) + 24;
}
});
this._mouseX = 0; // 鼠标当前x坐标
Object.defineProperty(this, 'mouseX', {
get: function () { return this._mouseX; },
set: function (x) {
this._mouseX = x;
this.MidiAction.frameXid = Math.floor((x + this.scrollX) / this._width);
}
});
this.audioContext = new AudioContext({ sampleRate: 44100 });
this.synthesizer = new TinySynth(this.audioContext);
this.Spectrogram = {
parent: this,
colorStep1: 100,
colorStep2: 240,
multiple: parseFloat(document.getElementById('multiControl').value),// 幅度的倍数
_spectrogram: null,
mask: '#25262daa',
getColor: (value) => { // 0-step1，是蓝色的亮度从0变为50%；step1-step2，是颜色由蓝色变为红色；step2-255，保持红色
value = value || 0;
let hue = 0, lightness = 50; // Red hue
if (value <= this.Spectrogram.colorStep1) {
hue = 240; // Blue hue
lightness = (value / this.Spectrogram.colorStep1) * 50; // Lightness from 0% to 50%
} else if (value <= this.Spectrogram.colorStep2) {
hue = 240 - ((value - this.Spectrogram.colorStep1) / (this.Spectrogram.colorStep2 - this.Spectrogram.colorStep1)) * 240;
} return `hsl(${hue}, 100%, ${lightness}%)`;
},
update: () => { // 不能用画图的坐标去限制，因为数据可能填不满画布 必须用id
const sp = this.Spectrogram;
const canvas = this.spectrum;
const ctx = this.spectrum.ctx;
let rectx = this.rectXstart;
for (let x = this.idXstart; x < this.idXend; x++) {
const s = sp._spectrogram[x];
let recty = this.rectYstart;
for (let y = this.idYstart; y < this.idYend; y++) {
ctx.fillStyle = sp.getColor(s[y] * sp.multiple);
ctx.fillRect(rectx, recty, this._width, -this._height);
recty -= this._height;
}
rectx += this._width;
}
let w = canvas.width - rectx;
// 画分界线
ctx.strokeStyle = "#FFFFFF";
ctx.beginPath();
for (let y = (((this.idYstart / 12) | 0) + 1) * 12,
rectY = canvas.height - this.height * y + this.scrollY,
dy = -12 * this.height;
y < this.idYend; y += 12, rectY += dy) {
ctx.moveTo(0, rectY);
ctx.lineTo(canvas.width, rectY);
} ctx.stroke();
// 填涂剩余部分
if (w > 0) {
ctx.fillStyle = '#25262d';
ctx.fillRect(rectx, 0, w, canvas.height);
}
// 铺底色以凸显midi音符
ctx.fillStyle = sp.mask;
ctx.fillRect(0, 0, rectx, canvas.height);
// 更新note
ctx.fillStyle = "#ffffff4f";
rectx = canvas.height - (this.Keyboard.highlight - 24) * this._height + this.scrollY;
ctx.fillRect(0, rectx, canvas.width, -this._height);
},
// 注意，getter 和 setter 的this指向为Spectrogram
get spectrogram() {
return this._spectrogram;
},
set spectrogram(s) {
if (!s) {
this._spectrogram = null;
this.parent.xnum = 0;
} else {
this._spectrogram = s;
this.parent.xnum = s.length; // 触发HscrollBar.refreshSize
this.parent.scroll2(); // 保持位置不变 本来是为了“一边分析一边绘制频谱”而设计的，虽然减少了等待但容易崩而且卡
}
},
get Alpha() {
return parseInt(this.mask.substring(7), 16);
},
set Alpha(a) {
a = Math.min(255, Math.max(a | 0, 0));
this.mask = '#25262d' + a.toString(16);
}
};
this.MidiAction = {
clickXid: 0,
clickYid: 0,
mode: 0, // 0: 笔模式 1: 选择模式
frameMode: 0, // 0: 框选 1: 列选 2: 行选
frameXid: -1, // 框选的终点的X序号(Y序号=this.Keyboard.highlight-24) 此变量便于绘制 如果是负数则不绘制
_tempdx: 0, // 鼠标移动记录上次
_tempdy: 0,
_anyAction: false, // 用于在选中多个后判断松开鼠标时应该如何处理选中
/* 一个音符 = {
y: 离散 和spectrum的y一致
x1: 离散 起点
x2: 离散 终点
ch: 音轨序号
selected: 是否选中
} */
selected: [], // 选中的音符 无序即可
midi: [], // 所有音符 需要维护有序性
// 多音轨
channelDiv: (() => {
const cd = new ChannelList(document.getElementById('funcSider'), this.synthesizer);
const saveOnReorder = () => this.snapshot.save();
const waitReorder = () => {
setTimeout(() => {
this.snapshot.save();
this.MidiAction.updateView();
cd.addEventListener('reorder', saveOnReorder);
}, 0); // 等待reorder的发生
}
cd.addEventListener('reorder', ({ detail }) => {
for (const nt of this.MidiAction.midi) {
nt.ch = detail[nt.ch];
} this.MidiAction.updateView();
});
cd.addEventListener('reorder', saveOnReorder);
cd.addEventListener('remove', ({ detail }) => {
cd.removeEventListener('reorder', saveOnReorder);
this.MidiAction.midi = this.MidiAction.midi.filter((nt) => nt.ch != detail.index);
this.MidiAction.selected = this.MidiAction.selected.filter((nt) => nt.ch != detail.index);
waitReorder();
});
cd.addEventListener('add', () => {
cd.removeEventListener('reorder', saveOnReorder);
waitReorder();
});
return cd;
})(),
insight: [], // 二维数组，每个元素为一个音轨视野内的音符 音符拾取依赖此数组
/**
* 更新this.MidiAction.insight
* 步骤繁琐，不必每次更新。触发时机:
* 1. channelDiv的reorder
* 2. midi的增删移动改变长度。由于都会调用且最后调用changeNoteY，所以只需要在changeNoteY中调用
* 3. scroll2
* 4. deleteNote
* 5. ctrlZ、ctrlY、ctrlV
*/
updateView: () => {
const m = this.MidiAction.midi;
const channel = Array.from(this.MidiAction.channelDiv.channel, () => []);
this.MidiAction.insight = channel;
// 原来用的二分有bug，所以干脆全部遍历
for (const nt of m) {
if (nt.x1 >= this.idXend) break;
if (nt.x2 < this.idXstart) continue;
if (nt.y < this.idYstart || nt.y >= this.idYend) continue;
channel[nt.ch].push(nt);
}
// midi模式下，视野要比音符宽一页，或超出视野半页
if(this.midiMode) {
const currentLen = this.Spectrogram.spectrogram.length;
let apage = this.spectrum.width / this._width;
let minLen = (m.length ? m[m.length - 1].x2 : 0) + apage * 1.5 | 0;
let viewLen = this.idXstart + apage | 0; // 如果视野在很外面，需要保持视野
if(viewLen > minLen) minLen = viewLen;
if(minLen != currentLen) this.Spectrogram.spectrogram.length = minLen; // length触发audio.duration和this.xnum
}
},
update: () => { // 按照insight绘制音符
const M = this.MidiAction;
const m = M.insight;
const s = this.spectrum.ctx;
const c = M.channelDiv.channel;
for (let ch = m.length - 1; ch >= 0; ch--) {
if (m[ch].length === 0 || (c[ch] && !c[ch].visible)) continue;
let ntcolor = c[ch].color;
for (const note of m[ch]) {
const params = [note.x1 * this._width - this.scrollX, this.spectrum.height - note.y * this._height + this.scrollY, (note.x2 - note.x1) * this._width, -this._height];
if (note.selected) {
s.fillStyle = '#ffffff';
s.fillRect(...params);
s.strokeStyle = ntcolor;
s.strokeRect(...params);
} else {
s.fillStyle = ntcolor;
s.fillRect(...params);
s.strokeStyle = '#ffffff';
s.strokeRect(...params);
}
}
} if (!M.mode || M.frameXid < 0) return;
// 绘制框选动作
s.fillStyle = '#f0f0f088';
let [xmin, xmax] = M.clickXid <= M.frameXid ? [M.clickXid, M.frameXid + 1] : [M.frameXid, M.clickXid + 1];
const Y = this.Keyboard.highlight - 24;
let [ymin, ymax] = Y <= M.clickYid ? [Y, M.clickYid + 1] : [M.clickYid, Y + 1];
let x1, x2, y1, y2;
if (M.frameMode == 1) { // 列选
x1 = xmin * this._width - this.scrollX;
x2 = (xmax - xmin) * this._width;
y1 = 0;
y2 = this.spectrum.height;
} else if (M.frameMode == 2) { // 行选
x1 = 0;
x2 = this.spectrum.width;
y1 = this.spectrum.height - ymax * this._height + this.scrollY;
y2 = (ymax - ymin) * this._height;
} else { // 框选
x1 = xmin * this._width - this.scrollX;
x2 = (xmax - xmin) * this._width;
y1 = this.spectrum.height - ymax * this._height + this.scrollY;
y2 = (ymax - ymin) * this._height;
} s.fillRect(x1, y1, x2, y2);
},
deleteNote: (save = true) => {
this.MidiAction.selected.forEach((v) => {
let i = this.MidiAction.midi.indexOf(v);
if (i != -1) this.MidiAction.midi.splice(i, 1);
});
this.MidiAction.selected.length = 0;
if (save) this.snapshot.save();
this.MidiAction.updateView();
},
clearSelected: () => { // 取消已选
this.MidiAction.selected.forEach(v => { v.selected = false; });
this.MidiAction.selected.length = 0;
},
/**
* 改变选中的音符的时长 依赖相对于点击位置的移动改变长度 所以需要提前准备好clickX
* 需要保证和changeNoteX同时只能使用一个
* @param {MouseEvent} e
*/
changeNoteDuration: (e) => {
this.MidiAction._anyAction = true;
// 兼容窗口滑动，以绝对坐标进行运算
let dx = (((e.offsetX + this.scrollX) / this._width) | 0) - this.MidiAction.clickXid;
this.MidiAction.selected.forEach((v) => {
if ((v.x2 += dx - this.MidiAction._tempdx) <= v.x1) v.x2 = v.x1 + 1;
});
this.MidiAction._tempdx = dx;
},
changeNoteY: () => { // 要求在trackMouse之后添加入spectrum的mousemoveEnent
this.MidiAction._anyAction = true;
let dy = this.Keyboard.highlight - 24 - this.MidiAction.clickYid;
this.MidiAction.selected.forEach((v) => {
v.y += dy - this.MidiAction._tempdy;
});
this.MidiAction._tempdy = dy;
this.MidiAction.updateView();
},
changeNoteX: (e) => {
this.MidiAction._anyAction = true;
let dx = (((e.offsetX + this.scrollX) / this._width) | 0) - this.MidiAction.clickXid;
this.MidiAction.selected.forEach((v) => {
let d = v.x2 - v.x1;
if ((v.x1 += dx - this.MidiAction._tempdx) < 0) v.x1 = 0; // 越界则设置为0
v.x2 = v.x1 + d;
});
this.MidiAction._tempdx = dx;
},
/**
* 框选音符的鼠标动作 由this.MidiAction.onclick_L调用
* 选中的标准：框住了音头
*/
selectAction: (mode = 0) => {
const m = this.MidiAction;
m.frameXid = m.clickXid; // 先置大于零，表示开始绘制
if (mode == 1) { // 列选
this.spectrum.addEventListener('mousemove', this.trackMouseX);
const up = () => {
this.spectrum.removeEventListener('mousemove', this.trackMouseX);
document.removeEventListener('mouseup', up);
let ch = m.channelDiv.selected;
if (ch) {
ch = ch.index;
let [xmin, xmax] = m.clickXid <= m.frameXid ? [m.clickXid, m.frameXid + 1] : [m.frameXid, m.clickXid + 1];
for (const nt of m.midi) nt.selected = (nt.x1 >= xmin && nt.x1 < xmax && nt.ch == ch);
m.selected = m.midi.filter(v => v.selected);
} m.frameXid = -1;
}; document.addEventListener('mouseup', up);
} else if (mode == 2) { // 行选
const up = () => {
document.removeEventListener('mouseup', up);
let ch = m.channelDiv.selected;
if (ch) {
ch = ch.index;
const Y = this.Keyboard.highlight - 24;
let [ymin, ymax] = Y <= m.clickYid ? [Y, m.clickYid + 1] : [m.clickYid, Y + 1];
for (const nt of m.midi) nt.selected = (nt.y >= ymin && nt.y < ymax && nt.ch == ch);
m.selected = m.midi.filter(v => v.selected);
} m.frameXid = -1;
}; document.addEventListener('mouseup', up);
} else { // 框选
this.spectrum.addEventListener('mousemove', this.trackMouseX);
const up = () => {
this.spectrum.removeEventListener('mousemove', this.trackMouseX);
document.removeEventListener('mouseup', up);
let ch = m.channelDiv.selected;
if (ch) {
ch = ch.index;
const Y = this.Keyboard.highlight - 24;
let [xmin, xmax] = m.clickXid <= m.frameXid ? [m.clickXid, m.frameXid + 1] : [m.frameXid, m.clickXid + 1];
let [ymin, ymax] = Y <= m.clickYid ? [Y, m.clickYid + 1] : [m.clickYid, Y + 1];
for (const nt of m.midi) nt.selected = (nt.x1 >= xmin && nt.x1 < xmax && nt.y >= ymin && nt.y < ymax && nt.ch == ch);
m.selected = m.midi.filter(v => v.selected);
} m.frameXid = -1; // 表示不在框选
}; document.addEventListener('mouseup', up);
}
},
/**
* 添加音符的鼠标动作 由this.MidiAction.onclick_L调用
*/
addNoteAction: () => {
const m = this.MidiAction;
if (!m.channelDiv.selected && !m.channelDiv.selectChannel(0)) return; // 如果没有选中则默认第一个
// 取消已选
m.clearSelected();
// 添加新音符，设置已选
const note = {
y: m.clickYid,
x1: m.clickXid,
x2: m.clickXid + 1,
ch: m.channelDiv.selected.index,
selected: true
}; m.selected.push(note);
{ // 二分插入
let l = 0, r = m.midi.length;
while (l < r) {
let mid = (l + r) >> 1;
if (m.midi[mid].x1 < note.x1) l = mid + 1;
else r = mid;
} m.midi.splice(l, 0, note);
}
m._anyAction = true;
m.updateView();
this.spectrum.addEventListener('mousemove', m.changeNoteDuration);
this.spectrum.addEventListener('mousemove', m.changeNoteY);
const removeEvent = () => {
this.spectrum.removeEventListener('mousemove', m.changeNoteDuration);
this.spectrum.removeEventListener('mousemove', m.changeNoteY);
document.removeEventListener('mouseup', removeEvent);
// 鼠标松开则存档
if (m._anyAction) this.snapshot.save();
}; document.addEventListener('mouseup', removeEvent);
},
onclick_L: (e) => {
//== step 1: 判断是否点在了音符上 ==//
const m = this.MidiAction;
const midi = m.midi;
m._anyAction = false;
// 为了支持在鼠标操作的时候能滑动，记录绝对位置
m._tempdx = m._tempdy = 0;
const x = m.clickXid = ((e.offsetX + this.scrollX) / this._width) | 0;
if (x >= this._xnum) { // 越界
m.clearSelected(); return;
}
const y = m.clickYid = this.Keyboard.highlight - 24;
// 找到点击的最近的音符 由于点击不经常，所以用遍历足矣 只需要遍历insight的音符
let n = null;
for (const ch of m.insight) {
// 每层挑选左侧最靠近的（如果有多个）
let distance = this._width * this._xnum;
for (const nt of ch) { // 由于来自midi，因此每个音轨内部是有序的
let dis = x - nt.x1;
if (dis < 0) break;
if (y == nt.y && x < nt.x2) {
if (dis < distance) {
distance = dis;
n = nt;
}
}
} if (n) break; // 只找最上层的
}
if (!n) { // 添加或框选音符
if (m.mode) m.selectAction(m.frameMode);
else m.addNoteAction();
return;
}
m.channelDiv.selectChannel(n.ch);
//== step 2: 如果点击到了音符，ctrl是否按下 ==/
if (e.ctrlKey) { // 有ctrl表示多选
if (n.selected) { // 已经选中了，取消选中
m.selected.splice(m.selected.indexOf(n), 1);
n.selected = false;
} else { // 没选中，添加选中
m.selected.push(n);
n.selected = true;
} return;
}
//== step 3: 单选时，是否选中了多个(事关什么时候取消选中) ==//
if (m.selected.length > 1 && n.selected) { // 如果选择了多个，在松开鼠标的时候处理选中
const up = () => {
if (!m._anyAction) { // 没有任何拖拽动作，说明为了单选
m.selected.forEach(v => { v.selected = false; });
m.selected.length = 0;
n.selected = true;
m.selected.push(n);
}
document.removeEventListener('mouseup', up);
}; document.addEventListener('mouseup', up);
} else { // 只选一个
if (n.selected) {
const up = () => {
if (!m._anyAction) { // 没有任何拖拽动作，说明为了取消选中
m.selected.forEach(v => { v.selected = false; });
m.selected.length = 0;
} document.removeEventListener('mouseup', up);
}; document.addEventListener('mouseup', up);
} else {
m.selected.forEach(v => { v.selected = false; });
m.selected.length = 0;
n.selected = true;
m.selected.push(n);
}
}
//== step 4: 如果点击到了音符，添加移动事件 ==//
if (((e.offsetX + this.scrollX) << 1) > (n.x2 + n.x1) * this._width) { // 靠近右侧，调整时长
this.spectrum.addEventListener('mousemove', m.changeNoteDuration);
this.spectrum.addEventListener('mousemove', m.changeNoteY);
const removeEvent = () => {
this.spectrum.removeEventListener('mousemove', m.changeNoteDuration);
this.spectrum.removeEventListener('mousemove', m.changeNoteY);
document.removeEventListener('mouseup', removeEvent);
// 鼠标松开则存档
if (m._anyAction) this.snapshot.save();
}; document.addEventListener('mouseup', removeEvent);
} else { // 靠近左侧，调整位置
this.spectrum.addEventListener('mousemove', m.changeNoteX);
this.spectrum.addEventListener('mousemove', m.changeNoteY);
const removeEvent = () => {
this.spectrum.removeEventListener('mousemove', m.changeNoteX);
this.spectrum.removeEventListener('mousemove', m.changeNoteY);
document.removeEventListener('mouseup', removeEvent);
this.MidiAction.midi.sort((a, b) => a.x1 - b.x1); // 排序非常重要 因为查找被点击的音符依赖顺序
// 鼠标松开则存档
if (m._anyAction) this.snapshot.save();
}; document.addEventListener('mouseup', removeEvent);
}
},
};
this.MidiPlayer = {
priorT: 1000 / 59, // 实际稳定在60帧，波动极小
realT: 1000 / 59,
_last: performance.now(),
lastID: -1,
restart: () => {
// 需要-1，防止当前时刻开始的音符不被播放
this.MidiPlayer.lastID = ((this.AudioPlayer.audio.currentTime * 1000 / this.dt) | 0) - 1;
},
update: () => {
const mp = this.MidiPlayer;
// 一阶预测
let tnow = performance.now();
// 由于requestAnimationFrame在离开界面的时候会停止，所以要设置必要的限定
if (tnow - mp._last < (mp.priorT << 1)) mp.realT = 0.2 * (tnow - mp._last) + 0.8 * mp.realT; // IIR低通滤波
mp._last = tnow;
if (this.AudioPlayer.audio.paused) return;
let predictT = this.time + 0.5 * (mp.realT + mp.priorT); // 先验和实测的加权和
let predictID = (predictT / this.dt) | 0;
// 寻找(mp.lastID, predictID]之间的音符
const m = this.MidiAction.midi;
if (m.length > 0) { // 二分查找要求长度大于0
let lastAt = m.length;
{ // 二分查找到第一个x1>mp.lastID的音符
let l = 0, r = lastAt - 1;
while (l <= r) {
let mid = (l + r) >> 1;
if (m[mid].x1 > mp.lastID) {
r = mid - 1;
lastAt = mid;
} else l = mid + 1;
}
}
for (; lastAt < m.length; lastAt++) {
const nt = m[lastAt];
if (nt.x1 > predictID) break;
if (this.MidiAction.channelDiv.channel[nt.ch].mute) continue;
this.synthesizer.play({
id: nt.ch,
f: this.Keyboard.freqTable[nt.y],
t: this.AudioPlayer.audio.currentTime - (nt.x1 * this.dt) / 1000,
last: (nt.x2 - nt.x1) * this.dt / 1000
});
}
}
mp.lastID = predictID;
}
};
this.AudioPlayer = {
name: "请上传文件", // 在this.Analyser.onfile中赋值
audio: new Audio(), // 在this.Analyser.onfile中重新赋值 此处需要一个占位
play_btn: document.getElementById('play-btn'),
durationString: '', // 在this.Analyser.audio.ondurationchange中更新
autoPage: false, // 自动翻页
repeat: true, // 是否区间循环
_crossFlag: false, // 上一时刻是否在重复区间终点左侧
EQfreq: [31, 62, 125, 250, 500, 1000, 2000, 4000, 8000, 16000],
// midiMode下url为duration
createAudio: (url) => {
return new Promise((resolve, reject) => {
const a = this.midiMode ? new FakeAudio(url) : new Audio(url);
a.loop = false;
a.volume = parseFloat(document.getElementById('audiovolumeControl').value);
a.ondurationchange = () => {
let ms = a.duration * 1000;
this.AudioPlayer.durationString = this.TimeBar.msToClockString(ms);
this.BeatBar.beats.maxTime = ms;
};
a.onended = () => {
this.time = 0;
this.AudioPlayer.stop();
};
a.onloadeddata = () => {
const ap = this.AudioPlayer;
if (!this.midiMode) {
ap.setEQ();
if (this.audioContext.state == 'suspended') this.audioContext.resume().then(() => a.pause());
document.title = ap.name + "~扒谱";
} else {
document.title = ap.name;
}
a.playbackRate = document.getElementById('speedControl').value; // load之后会重置速度
this.time = 0;
resolve(a);
a.onloadeddata = null; // 一次性 防止多次构造
ap.play_btn.firstChild.textContent = this.TimeBar.msToClockString(this.time);
ap.play_btn.lastChild.textContent = ap.durationString;
};
a.onerror = (e) => { // 如果正常分析，是用不到这个回调的，因为WebAudioAPI读取就会报错。但上传已有结果不会再分析
// 发现一些如mov格式的视频，不在video/的支持列表中，用.readAsDataURL转为base64后无法播放，会触发这个错误
// 改正方法是用URL.createObjectURL(file)生成一个blob地址而不是解析为base64
reject(e);
this.event.dispatchEvent(new Event('fileerror'));
};
this.AudioPlayer.setAudio(a);
});
},
update: () => {
const A = this.AudioPlayer;
const a = A.audio;
const btn = A.play_btn;
if (a.readyState != 4 || a.paused) return;
this.time = a.currentTime * 1000; // 【重要】更新时间
// 重复区间
let crossFlag = this.time < this.TimeBar.repeatEnd;
if (A.repeat && this.TimeBar.repeatEnd >= this.TimeBar.repeatStart) { // 重复且重复区间有效
let crossFlag = this.time < this.TimeBar.repeatEnd;
if (A._crossFlag && !crossFlag) { // 从重复区间终点左侧到右侧
this.time = this.TimeBar.repeatStart;
a.currentTime = this.time / 1000;
}
}
A._crossFlag = crossFlag;
btn.firstChild.textContent = this.TimeBar.msToClockString(this.time);
btn.lastChild.textContent = A.durationString;
// 自动翻页
if (A.autoPage && (this.time > this.idXend * this.dt || this.time < this.idXstart * this.dt)) {
this.scroll2(((this.time / this.dt - 1) | 0) * this._width, this.scrollY); // 留一点空位
}
},
/**
* 在指定的毫秒数开始播放
* @param {Number} at 开始的毫秒数 如果是负数，则从当下开始
*/
start: (at) => {
const a = this.AudioPlayer.audio;
if (a.readyState != 4) return;
if (at >= 0) a.currentTime = at / 1000;
this.AudioPlayer._crossFlag = false; // 置此为假可以暂时取消重复区间
this.MidiPlayer.restart();
if (a.readyState == 4) a.play();
else a.oncanplay = () => {
a.play();
a.oncanplay = null;
};
},
stop: () => {
this.AudioPlayer.audio.pause();
this.synthesizer.stopAll();
},
setEQ: (f = this.AudioPlayer.EQfreq) => {
const a = this.AudioPlayer.audio;
if (a.EQ) return;
// 由于createMediaElementSource对一个audio只能调用一次，所以audio的EQ属性只能设置一次
const source = this.audioContext.createMediaElementSource(a);
let last = source;
a.EQ = {
source: source,
filter: f.map((v) => {
const filter = this.audioContext.createBiquadFilter();
filter.type = "peaking";
filter.frequency.value = v;
filter.Q.value = 1;
filter.gain.value = 0;
last.connect(filter);
last = filter;
return filter;
})
};
last.connect(this.audioContext.destination);
},
setAudio: (newAudio) => {
const A = this.AudioPlayer.audio;
if (A) {
A.pause();
A.onerror = null; // 防止触发fileerror
A.src = '';
if (A.EQ) {
A.EQ.source.disconnect();
for (const filter of A.EQ.filter) filter.disconnect();
}
// 配合传参为URL.createObjectURL(file)使用，防止内存泄露
URL.revokeObjectURL(this.AudioPlayer.audio.src);
}
this.AudioPlayer.audio = newAudio;
}
};
this.Keyboard = {
highlight: -1, // 选中了哪个音 音的编号以midi协议为准 C1序号为24 根this.mouseY一起在onmousemove更新
freqTable: new FreqTable(440), // 在this.Analyser.analyse中赋值
// 以下为画键盘所需
_idchange: new Int8Array([2, 2, 1, 2, 2, 2, -10, 2, 3, 2, 2, 2]), // id变化
_ychange: new Float32Array(12), // 纵坐标变化，随this.height一起变化
update: () => {
const kbd = this.Keyboard;
const ctx = this.keyboard.ctx;
const w = this.keyboard.width;
const w2 = w * 0.618;
ctx.fillStyle = '#fff';
ctx.fillRect(0, 0, w, this.keyboard.height);
let noteID = this.idYstart + 24; // 最下面对应的音的编号
let note = noteID % 12; // 一个八度中的第几个音
let baseY = this.rectYstart + note * this._height; // 这个八度左下角的y坐标
noteID -= note; // 这个八度C的编号
while (true) {
ctx.beginPath(); // 必须写循环内
ctx.fillStyle = 'orange';
for (let i = 0, rectY = baseY, id = noteID; i < 7 & rectY > 0; i++) { // 画白键
let dy = kbd._ychange[i];
if (this.Keyboard.highlight == id) ctx.fillRect(0, rectY, w, dy); // 被选中的
ctx.moveTo(0, rectY); // 画线即可 下划线
ctx.lineTo(w, rectY);
rectY += dy;
id += kbd._idchange[i];
} ctx.stroke();
// 写音阶名
ctx.fillStyle = "black"; ctx.fillText(Math.floor(noteID / 12) - 1, w - this._height * 0.75, baseY - this._height * 0.3);
baseY -= this._height; noteID++;
for (let i = 7; i < 12; i++) {
if (this.Keyboard.highlight == noteID) { // 考虑到只要画一次高亮，不必每次都改fillStyle
ctx.fillStyle = '#Ffa500ff';
ctx.fillRect(0, baseY, w2, -this._height);
ctx.fillStyle = 'black';
} else ctx.fillRect(0, baseY, w2, -this._height);
baseY += kbd._ychange[i];
noteID += kbd._idchange[i];
if (baseY < 0) return;
}
}
},
mousedown: () => { // 鼠标点击后发声
let ch = this.MidiAction.channelDiv.selected;
if (!ch || ch.mute) return;
ch = ch ? ch.ch : this.synthesizer;
let nt = ch.play({ f: this.Keyboard.freqTable[this.Keyboard.highlight - 24] });
let last = this.Keyboard.highlight; // 除颤
const tplay = this.audioContext.currentTime;
const move = () => {
if (last === this.Keyboard.highlight) return;
last = this.Keyboard.highlight;
let dt = this.audioContext.currentTime - tplay;
this.synthesizer.stop(nt, dt > 0.3 ? 0 : dt - 0.3);
nt = ch.play({ f: this.Keyboard.freqTable[this.Keyboard.highlight - 24] });
}; document.addEventListener('mousemove', move);
const up = () => {
let dt = this.audioContext.currentTime - tplay;
this.synthesizer.stop(nt, dt > 0.5 ? 0 : dt - 0.5);
document.removeEventListener('mousemove', move);
document.removeEventListener('mouseup', up);
}; document.addEventListener('mouseup', up);
}
}; this.height = this._height; // 更新this.Keyboard._ychange
this.TimeBar = {
interval: 10, // 每个标注的间隔块数 在updateInterval中更新
// 重复区间参数 单位：毫秒 如果start>end则区间不起作用
repeatStart: -1,
repeatEnd: -1,
/**
* 毫秒转 分:秒:毫秒
* @param {Number} ms 毫秒数
* @returns [分,秒,毫秒]
*/
msToClock: (ms) => {
return [
Math.floor(ms / 60000),
Math.floor((ms % 60000) / 1000),
ms % 1000 | 0
];
},
msToClockString: (ms) => {
const t = this.TimeBar.msToClock(ms);
return `${t[0].toString().padStart(2, "0")}:${t[1].toString().padStart(2, "0")}:${t[2].toString().padStart(3, "0")}`;
},
// timeBar的上半部分画时间轴
update: () => {
const canvas = this.timeBar;
const ctx = this.timeBar.ctx;
const tb = this.TimeBar;
let idstart = Math.ceil(this.idXstart / tb.interval - 0.1); // 画面中第一个时间点的序号
let dt = tb.interval * this.dt; // 时间的步长
let dp = this.width * tb.interval; // 像素的步长
let timeAt = dt * idstart; // 对应的毫秒
let p = idstart * dp - this.scrollX; // 对应的像素
let h = canvas.height >> 1; // 上半部分
ctx.fillStyle = '#25262d';
ctx.fillRect(0, 0, canvas.width, h);
ctx.fillStyle = '#8e95a6';
//== 画刻度 标时间 ==//
ctx.strokeStyle = '#ff0000';
ctx.beginPath();
for (let endPix = canvas.width + (dp >> 1); p < endPix; p += dp, timeAt += dt) {
ctx.moveTo(p, 0);
ctx.lineTo(p, h);
ctx.fillText(tb.msToClockString(timeAt), p - 28, 16);
} ctx.stroke();
//== 画重复区间 ==//
let begin = this._width * tb.repeatStart / this.dt - this.scrollX; // 单位：像素
let end = this._width * tb.repeatEnd / this.dt - this.scrollX;
const spectrum = this.spectrum.ctx;
const spectrumHeight = this.spectrum.height;
// 画线
if (begin >= 0 && begin < canvas.width) { // 画左边
ctx.beginPath(); spectrum.beginPath();
ctx.strokeStyle = spectrum.strokeStyle = '#20ff20';
ctx.moveTo(begin, 0); ctx.lineTo(begin, canvas.height);
spectrum.moveTo(begin, 0); spectrum.lineTo(begin, spectrumHeight);
ctx.stroke(); spectrum.stroke();
}
if (end >= 0 && end < canvas.width) { // 画右边
ctx.beginPath(); spectrum.beginPath();
ctx.strokeStyle = spectrum.strokeStyle = '#ff2020';
ctx.moveTo(end, 0); ctx.lineTo(end, canvas.height);
spectrum.moveTo(end, 0); spectrum.lineTo(end, spectrumHeight);
ctx.stroke(); spectrum.stroke();
}
// 画区间 如果begin>end则区间不起作用，不绘制
if (begin < end) {
begin = Math.max(begin + 1, 0); end = Math.min(end - 1, canvas.width);
ctx.fillStyle = spectrum.fillStyle = '#80808044';
ctx.fillRect(begin, 0, end - begin, canvas.height);
spectrum.fillRect(begin, 0, end - begin, spectrumHeight);
}
//== 画当前时间指针 ==//
spectrum.strokeStyle = 'white';
begin = this.time / this.dt * this._width - this.scrollX;
if (begin >= 0 && begin < canvas.width) {
spectrum.beginPath();
spectrum.moveTo(begin, 0);
spectrum.lineTo(begin, spectrumHeight);
spectrum.stroke();
}
},
updateInterval: () => { // 根据this.width改变 在width的setter中调用
const fontWidth = this.timeBar.ctx.measureText('00:00:000').width * 1.2;
// 如果间距小于fontWidth则细分
this.TimeBar.interval = Math.max(1, Math.ceil(fontWidth / this._width));
},
contextMenu: new ContextMenu([
{
name: "设置重复区间开始位置",
callback: (e_father, e_self) => {
this.TimeBar.repeatStart = (e_father.offsetX + this.scrollX) * this.TperP;
}
}, {
name: "设置重复区间结束位置",
callback: (e_father, e_self) => {
this.TimeBar.repeatEnd = (e_father.offsetX + this.scrollX) * this.TperP;
}
}, {
name: "取消重复区间",
onshow: () => this.TimeBar.repeatStart >= 0 || this.TimeBar.repeatEnd >= 0,
callback: () => {
this.TimeBar.repeatStart = -1;
this.TimeBar.repeatEnd = -1;
}
}, {
name: "从此处播放",
callback: (e_father, e_self) => {
this.AudioPlayer.stop();
this.AudioPlayer.start((e_father.offsetX + this.scrollX) * this.TperP);
}
}
])
};
this.BeatBar = {
beats: new Beats(),
update: () => {
const canvas = this.timeBar;
const ctx = this.timeBar.ctx;
ctx.fillStyle = '#2e3039';
const h = canvas.height >> 1;
ctx.fillRect(0, h, canvas.width, canvas.width);
ctx.fillStyle = '#8e95a6';
const spectrum = this.spectrum.ctx;
const spectrumHeight = this.spectrum.height;
ctx.strokeStyle = '#f0f0f0f0';
const iterator = this.BeatBar.beats.iterator(this.scrollX * this.TperP, true);
ctx.beginPath(); spectrum.beginPath();
while (1) {
let measure = iterator.next();
if (measure.done) break;
measure = measure.value;
let x = measure.start * this.PperT - this.scrollX;
if (x > canvas.width) break;
ctx.moveTo(x, h);
ctx.lineTo(x, canvas.height);
spectrum.strokeStyle = '#a0a0a0';
spectrum.moveTo(x, 0);
spectrum.lineTo(x, spectrumHeight);
// 写字
let Interval = measure.interval * this.PperT;
ctx.fillText(Interval < 38 ? measure.id : `${measure.id}. ${measure.beatNum}/${measure.beatUnit}`, x + 2, h + 14);
// 画更细的节拍线
let dp = Interval / measure.beatNum;
if (dp < 20) continue;
spectrum.strokeStyle = '#909090';
for (let i = measure.beatNum; i > 0; i--, x += dp) {
spectrum.moveTo(x, 0);
spectrum.lineTo(x, spectrumHeight);
}
} ctx.stroke(); spectrum.stroke();
},
contextMenu: new ContextMenu([
{
name: "设置小节",
callback: (e_father, e_self) => {
const bs = this.BeatBar.beats;
const m = bs.setMeasure((e_father.offsetX + this.scrollX) * this.TperP, undefined, true);
let tempDiv = document.createElement('div');
tempDiv.innerHTML = `
<div class="request-cover">
<div class="card hvCenter"><label class="title">小节${m.id}设置</label>
<div class="layout"><span>拍数</span><input type="text" name="ui-ask" step="1" max="16" min="1"></div>
<div class="layout"><span>音符</span><select name="ui-ask">
<option value="2">2分</option>
<option value="4">4分</option>
<option value="8">8分</option>
<option value="16">16分</option>
</select></div>
<div class="layout"><span>BPM:</span><input type="number" name="ui-ask" min="1"></div>
<div class="layout"><span>(忽略以上)和上一小节一样</span><input type="checkbox" name="ui-ask"></div>
<div class="layout"><span>应用到后面相邻同类型小节</span><input type="checkbox" name="ui-ask" checked></div>
<div class="layout"><button class="ui-cancel">取消</button><button class="ui-confirm">确定</button></div>
</div>
</div>`;
const Pannel = tempDiv.firstElementChild;
document.body.insertBefore(Pannel, document.body.firstChild);
Pannel.tabIndex = 0;
Pannel.focus();
function close() { Pannel.remove(); }
const inputs = Pannel.querySelectorAll('[name="ui-ask"]');
const btns = Pannel.getElementsByTagName('button');
inputs[0].value = m.beatNum; // 拍数
inputs[1].value = m.beatUnit; // 音符类型
inputs[2].value = m.bpm; // bpm
btns[0].onclick = close;
btns[1].onclick = () => {
if (!inputs[4].checked) { // 后面不变
bs.setMeasure(m.id + 1, false); // 让下一个生成实体
}
if (inputs[3].checked) { // 和上一小节一样
let last = bs.getMeasure(m.id - 1, false);
m.copy(last);
} else {
m.beatNum = parseInt(inputs[0].value);
m.beatUnit = parseInt(inputs[1].value);
m.bpm = parseInt(inputs[2].value);
} bs.check(); close();
};
}
}, {
name: "后方插入一小节",
callback: (e_father) => {
this.BeatBar.beats.add((e_father.offsetX + this.scrollX) * this.TperP, true);
}
}, {
name: "重置后面所有小节",
callback: (e_father) => {
let base = this.BeatBar.beats.getBaseIndex((e_father.offsetX + this.scrollX) * this.TperP, true);
this.BeatBar.beats.splice(base + 1);
}
}, {
name: '<span style="color: red;">删除该小节</span>',
callback: (e_father, e_self) => {
this.BeatBar.beats.delete((e_father.offsetX + this.scrollX) * this.TperP, true);
}
}
]),
belongID: -1, // 小节线前一个小节的id
moveCatch: (e) => { // 画布上光标移动到小节线上可以进入调整模式
if (e.offsetY < this.timeBar.height >> 1) {
this.timeBar.classList.remove('selecting');
this.BeatBar.belongID = -1;
return;
}
let timeNow = (e.offsetX + this.scrollX) * this.TperP;
let m = this.BeatBar.beats.getMeasure(timeNow, true);
if (m == null) {
this.BeatBar.belongID = -1;
this.timeBar.classList.remove('selecting');
return;
}
let threshold = 6 * this.TperP;
if (timeNow - m.start < threshold) {
this.BeatBar.belongID = m.id - 1;
this.timeBar.classList.add('selecting');
} else if (m.start + m.interval - timeNow < threshold) {
this.BeatBar.belongID = m.id;
this.timeBar.classList.add('selecting');
} else {
this.BeatBar.belongID = -1;
this.timeBar.classList.remove('selecting');
}
}
};
// 小插件对象
this.pitchNameDisplay = { // 音名显示 配合设置中的checkbox使用
_showPitchName: null,
showPitchName: (ifshow) => {