test('fill to another buffer', function () {
var a = new AudioBuffer([1,2,3,4]);
var b = util.shallow(a);
util.fill(a, b, 1, 1, 3);
assert.deepEqual(a.getChannelData(0), [1,2]);
assert.deepEqual(a.getChannelData(1), [3,4]);
assert.deepEqual(b.getChannelData(0), [0,1]);
assert.deepEqual(b.getChannelData(1), [0,1]);
});
test('zero', function () {
var buf1 = new AudioBuffer([1, 0.5, -1, 0]);
util.zero(buf1);
assert.deepEqual(buf1.getChannelData(0), [0, 0]);
assert.deepEqual(buf1.getChannelData(1), [0, 0]);
assert.throws(function () {
util.invert(buf1.getChannelData(0));
});
});
test('noise', function () {
var buf1 = new AudioBuffer(4);
util.noise(buf1);
assert.notDeepEqual(buf1.getChannelData(0), [0, 0]);
assert.notDeepEqual(buf1.getChannelData(1), [0, 0]);
assert.throws(function () {
util.noise(buf1.getChannelData(0));
});
});
test('fill with value', function () {
var a = new AudioBuffer([1,2,3,4]);
util.fill(a, 1, 1, 3);
assert.deepEqual(a.getChannelData(0), [1,1]);
assert.deepEqual(a.getChannelData(1), [3,1]);
assert.throws(function () {
util.fill(a.getChannelData(1), 1);
});
});
test('fill with function', function () {
var a = new AudioBuffer([1,2,3,4]);
util.fill(a, function (sample, channel, offset) { return channel + offset });
assert.deepEqual(a.getChannelData(0), [0,1]);
assert.deepEqual(a.getChannelData(1), [1,2]);
assert.throws(function () {
util.fill([1,2,3], function () {});
});
});
test('clone - backing arrays are not shared between buffers', function () {
var buf1 = new AudioBuffer([0, 1, 2, 3, 4]);
var buf2 = util.clone(buf1);
buf2.getChannelData(0)[0] = 100;
assert.equal(0, buf1.getChannelData(0)[0]);
});
test('invert', function () {
var buf1 = new AudioBuffer([1, 0.5, -1, 0]);
util.invert(buf1);
assert.deepEqual(buf1.getChannelData(0), [-1, -0.5]);
assert.deepEqual(buf1.getChannelData(1), [1, 0]);
assert.throws(function () {
util.invert(new Float32Array([1,2,3]));
});
var buf2 = util.shallow(buf1);
util.invert(buf1, buf2);
assert.deepEqual(buf2.getChannelData(1), [-1, 0]);
});
test('reverse', function () {
var buf1 = new AudioBuffer([1, 0, -1, 0]);
util.reverse(buf1);
assert.deepEqual(buf1.getChannelData(0), [0, 1]);
assert.deepEqual(buf1.getChannelData(1), [0, -1]);
assert.throws(function () {
util.reverse([1,2,3]);
});
var buf2 = util.shallow(buf1);
util.reverse(buf1, buf2);
assert.deepEqual(buf2.getChannelData(1), [-1, 0]);
});
test('copy', function () {
var buf1 = new AudioBuffer([1, 0, -1, 0]);
var buf2 = util.shallow(buf1);
util.copy(buf1, buf2);
assert(util.equal(buf1, buf2));
assert.notEqual(buf1, buf2);
buf2.getChannelData(0)[1] = 0.5;
assert.deepEqual(buf1.getChannelData(0), [1, 0]);
assert.deepEqual(buf2.getChannelData(0), [1, 0.5]);
var buf3 = new AudioBuffer(8);
util.copy(buf2, buf3, 4);
assert.deepEqual(buf3.getChannelData(0), [0,0,0,0, 1, 0.5, 0, 0]);
// util.copy(buf3, buf2);
});
test('Write Float32Array', function (t) {
var stream = Writable(context.destination);
var buf = new AudioBuffer(1024*8);
util.noise(buf);
stream.write(buf.getChannelData(0));
setTimeout(function () {
stream.end();
t.end();
}, 300);
});
test('clone', function () {
var buf1 = new AudioBuffer([1, 0, -1, 0]);
var buf2 = util.clone(buf1);
assert(util.equal(buf1, buf2));
assert.notEqual(buf1, buf2);
buf2.getChannelData(0)[1] = 0.5;
assert.deepEqual(buf1.getChannelData(0), [1, 0]);
assert.deepEqual(buf2.getChannelData(0), [1, 0.5]);
assert.throws(function () {
util.clone({});
});
});
test('slice', function () {
var a = new AudioBuffer(3, [1,2,3,4,5,6,7,8,9]);
var b = util.slice(a, 1);
assert.deepEqual(b.getChannelData(0), [2,3]);
assert.deepEqual(b.getChannelData(1), [5,6]);
var c = util.slice(a, 1, 2);
assert.deepEqual(c.getChannelData(0), [2]);
assert.deepEqual(c.getChannelData(1), [5]);
assert.deepEqual(c.numberOfChannels, 3);
b.getChannelData(0)[0] = 1;
assert.deepEqual(b.getChannelData(0), [1,3]);
assert.deepEqual(a.getChannelData(0), [1, 2, 3]);
assert.throws(function () {
util.slice([1,2,3,4], 1, 2);
});
});
test.skip('subbuffer', function () {
//NOTE: in web-audio-API two audiobuffers cannot share the same memory
//as far `.buffer` property of typedarrays cannot be overridden
//and typedarrays are created by WebAudioBuffer innerly
var a = new AudioBuffer(3, [1,2,3,4,5,6,7,8,9]);
var b = util.subbuffer(a, 1);
assert.deepEqual(b.getChannelData(0), [2,3]);
assert.deepEqual(b.getChannelData(1), [5,6]);
var c = util.subbuffer(a, 1, 2);
assert.deepEqual(c.getChannelData(0), [2]);
assert.deepEqual(c.getChannelData(1), [5]);
assert.deepEqual(c.numberOfChannels, 3);
b.getChannelData(0)[0] = 1;
assert.deepEqual(b.getChannelData(0), [1,3]);
assert.deepEqual(a.getChannelData(0), [1, 1, 3]);
assert.deepEqual(c.getChannelData(0), [1]);
});
module.exports = function createBuffer (source, options) {
var length, data, channels, sampleRate, format, c, l
//src, channels
if (typeof options === 'number') {
options = {channels: options}
}
else if (typeof options === 'string') {
options = {format: options}
}
//{}
else if (options === undefined) {
if (isObj(source)) {
options = source
source = undefined
}
else {
options = {}
}
}
options = pick(options, {
format: 'format type dtype dataType',
channels: 'channel channels numberOfChannels channelCount',
sampleRate: 'sampleRate rate',
length: 'length size',
duration: 'duration time'
})
//detect options
channels = options.channels
sampleRate = options.sampleRate
if (options.format) format = getFormat(options.format)
if (format) {
if (channels && !format.channels) format.channels = channels
else if (format.channels && !channels) channels = format.channels
if (!sampleRate && format.sampleRate) sampleRate = format.sampleRate
}
//empty buffer
if (source == null) {
if (options.duration != null) {
if (!sampleRate) sampleRate = 44100
length = sampleRate * options.duration
}
else length = options.length
}
//if audio buffer passed - create fast clone of it
else if (isAudioBuffer(source)) {
length = source.length
if (channels == null) channels = source.numberOfChannels
if (sampleRate == null) sampleRate = source.sampleRate
if (source._channelData) {
data = source._channelData.slice(0, channels)
}
else {
data = []
for (c = 0, l = channels; c < l; c++) {
data[c] = source.getChannelData(c)
}
}
}
//if create(number, channels? rate?) = create new array
//this is the default WAA-compatible case
else if (typeof source === 'number') {
length = source
}
//if array with channels - parse channeled data
else if (Array.isArray(source) && (Array.isArray(source[0]) || ArrayBuffer.isView(source[0]))) {
length = source[0].length;
data = []
if (!channels) channels = source.length
for (c = 0; c < channels; c++) {
data[c] = source[c] instanceof Float32Array ? source[c] : new Float32Array(source[c])
}
}
//if ndarray, ndsamples, or anything with data
else if (source.shape && source.data) {
if (source.shape) channels = source.shape[1]
if (!sampleRate && source.format) sampleRate = source.format.sampleRate
return createBuffer(source.data, {
channels: channels,
sampleRate: sampleRate
})
}
//TypedArray, Buffer, DataView etc, ArrayBuffer, Array etc.
//NOTE: node 4.x+ detects Buffer as ArrayBuffer view
else {
if (typeof source === 'string') {
source = str2ab(source)
}
if (!format) format = getFormat(source)
if (!channels) channels = format.channels || 1
source = convert(source, format, 'float32 planar')
length = Math.floor(source.length / channels);
data = []
for (c = 0; c < channels; c++) {
data[c] = source.subarray(c * length, (c + 1) * length);
}
}
//create buffer of proper length
var audioBuffer = new AudioBuffer((options.context === null || length === 0) ? null : options.context || getContext(), {
length: length == null ? 1 : length,
numberOfChannels: channels || 1,
sampleRate: sampleRate || 44100
})
//fill channels
if (data) {
for (c = 0, l = data.length; c < l; c++) {
audioBuffer.getChannelData(c).set(data[c]);
}
}
return audioBuffer
}
assert.throws(function () {
util.invert(buf1.getChannelData(0));
});
assert.throws(function () {
util.noise(buf1.getChannelData(0));
});
assert.throws(function () {
util.fill(a.getChannelData(1), 1);
});