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audio-buffer-utils [](https://travis-ci.org/audiojs/audio-buffer-utils) [](http://github.com/badges/stability-badges) [](https://greenkeeper.io/)\r\n\r\nUtility functions for [_AudioBuffers_](https://github.com/audiojs/audio-buffer) in web-audio and node. Optimized for performance.\r\n\r\n* [util.create(src, ch|opts?)](https://github.com/audiojs/audio-buffer-utils#utilcreatedatalength-optionschannels1-samplerate44100)\r\n* [util.shallow(buf)](#utilshallowbuffer)\r\n* [util.clone(buf)](#utilclonebuffer)\r\n* [util.copy(buf, dst, start?)](#utilcopyfrombuffer-tobuffer-offset0)\r\n* [util.slice(buf, start?, end?)](#utilslicebuffer-start0-end-0)\r\n* [util.subbuffer(buf, start?, end?, ch?)](#utilsubbufferbuffer-start0-end-0-channels)\r\n* [util.concat(a, b, ...)](#utilconcatbuffer1-buffer2-buffer3-buffern-)\r\n* [util.repeat(buf, n)](#utilrepeatbuffer-times)\r\n* [util.reverse(src, dst?, start?, end?)](#utilreversebuffer-target-start0-end-0)\r\n* [util.invert(src, dst?, start?, end?)](#utilinvertbuffer-target-start0-end-0)\r\n* [util.zero(buf)](#utilzerobuffer)\r\n* [util.noise(buf)](#utilnoisebuffer)\r\n* [util.equal(a, b, ...)](#utilequalbuffera-bufferb-)\r\n* [util.fill(buf, dst?, val, start?, end?)](#utilfillbuffer-target-valuevalue-i-channelvalue-start0-end-0)\r\n* [util.resize(buf, len)](#utilresizebuffer-length)\r\n* [util.pad(buf, len, val?)](#utilpadbufferlength-lengthbuffer-value0)\r\n* [util.shift(buf, off)](#utilshiftbuffer-offset)\r\n* [util.rotate(buf, off)](#utilrotatebuffer-offset)\r\n* [util.normalize(buf, dst?, start?, end?)](#utilnormalizebuffer-target-start0-end-0)\r\n* [util.removeStatic(buf, dst?, start?, end?)](#utilremovestaticbuffer-target-start0-end-0)\r\n* [util.trim(buf, lvl)](#utiltrimbuffer-threshold0)\r\n* [util.mix(a, b, amt?, off?)](#utilmixbuffera-bufferb-ratiovala-valb-i-channelval-offset0)\r\n* [util.size(buf)](#utilsizebuffer)\r\n* [util.data(buf, dst?)](#utildatabuffer-data)\r\n\r\n## Usage\r\n\r\n[](https://npmjs.org/package/audio-buffer-utils/)\r\n\r\n### `util.create(data|length, options|channels=1, sampleRate=44100)`\r\n\r\nCreate a new buffer from any argument.\r\nData can be a length, an array with channels' data, an other buffer or plain array. See [audio-buffer-from](https://github.com/audiojs/audio-buffer-from) module.\r\n\r\n```js\r\n//mono buffer with 100 samples\r\nlet a = util.create(100)\r\n\r\n//stereo buffer with predefined channels data\r\nlet b = util.create([Array(100).fill(0.5), Array(100).fill(0.4)])\r\n\r\n//minimal length buffer (1 sample, 1 channel)\r\nlet c = util.create()\r\n\r\n//create 2 seconds buffer with reduced sample rate\r\nlet rate = 22050\r\nlet d = util.create(2 * rate, 2, rate)\r\n```\r\n\r\n### `util.shallow(buffer)`\r\nCreate a new buffer with the same characteristics as `buffer`, contents are undefined.\r\n\r\n```js\r\n//create buffer with the same shape as `a`\r\nlet b = util.shallow(a)\r\n\r\nutil.equal(a, b) //false\r\n```\r\n\r\n### `util.clone(buffer)`\r\nCreate a new buffer with the same characteristics as `buffer`, fill it with a copy of `buffer`'s data, and return it.\r\n\r\n```js\r\n//clone buffer `a`\r\nlet b = util.clone(a)\r\n\r\nutil.equal(a, b) //true\r\n```\r\n\r\n### `util.copy(fromBuffer, toBuffer, offset=0)`\r\nCopy the data from one buffer to another, with optional offset. If length of `fromBuffer` exceeds `offset + toBuffer.length`, an error will be thrown.\r\n\r\n### `util.slice(buffer, start=0, end=-0)`\r\nCreate a new buffer by slicing the current one.\r\n\r\n### `util.subbuffer(buffer, start=0, end=-0, channels?)`\r\nCreate a new buffer by subreferencing the current one. The new buffer represents a handle for the source buffer, working on it's data. Note that it is null-context buffer, meaning that it is not bound to web audio API. To convert it to real _AudioBuffer_, use `util.slice` or `util.create`.\r\n\r\n`channels` array may apply channels mapping to pick only indicated channels from the initial buffer. See also [audio-buffer-remix](https://github.com/audiojs/audio-buffer-remix).\r\n\r\n```js\r\nvar a = util.create(100, 2)\r\nvar b = util.subbuffer(10, 90)\r\n\r\n//b references a\r\nb.getChannelData(0)[0] = 1\r\na.getChannelData(0)[10] // 1\r\n\r\n//convert b to web-audio-api buffer\r\nb = util.slice(b)\r\n\r\n//create mono-buffer from a\r\nvar c = util.subbuffer(a, [1])\r\n```\r\n\r\n### `util.concat(buffer1, [buffer2, buffer3], bufferN, ...)`\r\nCreate a new buffer by concatting buffers or list.\r\nChannels are extended to the buffer with maximum number.\r\n\r\n### `util.repeat(buffer, times)`\r\nReturn a new buffer with contents of the initial one repeated defined number of times.\r\n\r\n### `util.reverse(buffer, target?, start=0, end=-0)`\r\nReverse `buffer`. Place data to `target` buffer, if any, otherwise modify `buffer` in-place.\r\n\r\n### `util.invert(buffer, target?, start=0, end=-0)`\r\nInvert `buffer`. Place data to `target` buffer, if any, otherwise modify `buffer` in-place.\r\n\r\n### `util.zero(buffer)`\r\nZero all of `buffer`'s channel data. `buffer` is modified in-place.\r\n\r\n### `util.noise(buffer)`\r\nFill `buffer` with random data. `buffer` is modified in-place.\r\n\r\n### `util.equal(bufferA, bufferB, ...)`\r\nTest whether the content of N buffers is the same.\r\n\r\n```js\r\nlet a = util.create(1024, 2)\r\nutil.noise(a)\r\nlet b = util.clone(a)\r\nlet c = util.shallow(a)\r\nutil.copy(a, c)\r\n\r\nif (util.equal(a, b, c)) {\r\n\t//true\r\n}\r\n```\r\n\r\n### `util.fill(buffer, target?, value|(value, i, channel)=>value, start=0, end=-0)`\r\nFill `buffer` with provided function or value.\r\nPlace data to `target` buffer, if any, otherwise modify `buffer` in-place (that covers _map_ functionality).\r\nPass optional `start` and `end` indexes.\r\n\r\n```js\r\nlet frequency = 440, rate = 44100\r\n\r\n//create 2 seconds buffer\r\nlet a = util.create(2 * rate)\r\n\r\n//populate with 440hz sine wave\r\nutil.fill(a, (value, i, channel)=>Math.sin(Math.PI * 2 * frequency * i / rate))\r\n```\r\n\r\n### `util.resize(buffer, length)`\r\nReturn new buffer based on the passed one, with shortened/extended length.\r\nInitial data is whether sliced or filled with zeros. Combines `util.pad` and `util.slice`.\r\n\r\n```js\r\n//change duration to 2s\r\nlet b = util.resize(a, 2 * a.sampleRate)\r\n```\r\n\r\n### `util.pad(buffer|length, length|buffer, value=0)`\r\n### `util.padLeft(buffer, length, value=0)`\r\n### `util.padRight(buffer, length, value=0)`\r\nRight/left-pad buffer to the length, filling with value.\r\n\r\n```js\r\nlet buf = util.create(3, 1)\r\nutil.fill(buf, .2)\r\n\r\nutil.pad(buf, 5) // [.2,.2,.2, 0,0]\r\nutil.pad(5, buf) // [0,0, .2,.2,.2]\r\nutil.pad(buf, 5, .1) // [.2,.2,.2, .1,.1]\r\nutil.pad(5, buf, .1) // [.1,.1, .2,.2,.2]\r\n```\r\n\r\n### `util.shift(buffer, offset)`\r\nShift signal in the time domain by `offset` samples, filling with zeros.\r\nModify `buffer` in-place.\r\n\r\n### `util.rotate(buffer, offset)`\r\nShift signal in the time domain by `offset` samples, in circular fashion.\r\nModify `buffer` in-place.\r\n\r\n### `util.normalize(buffer, target?, start=0, end=-0)`\r\nNormalize buffer by the amplitude, bring to -1..+1 range. Channel amplitudes ratio will be preserved. You may want to remove static level beforehead, because normalization preserves zero static level. Note that it is not the same as [array-normalize](https://github.com/dy/array-noramalize).\r\nPlaces data to `target` buffer, if any, otherwise modifies `buffer` in-place.\r\n\r\n```js\r\nconst AudioBuffer = require('audio-buffer')\r\nconst util = require('audio-buffer-utils')\r\n\r\nlet buf = AudioBuffer(1, [0, 0.2, 0, -0.4]);\r\nutil.normalize(buf);\r\nbuf.getChannelData(0) // [0, .5, 0, -1]\r\n```\r\n\r\n### `util.removeStatic(buffer, target?, start=0, end=-0)`\r\nRemove DC (Direct Current) offset from the signal, i.e. remove static level, that is bring mean to zero. DC offset will be reduced for every channel independently.\r\n\r\n```js\r\nvar a = AudioBuffer(2, [.5,.7,.3,.5])\r\n\r\nutil.removeStatic(a)\r\n\r\na.getChannelData(0) // [-.1, .1]\r\na.getChannelData(1) // [-.1, .1]\r\n```\r\n\r\n### `util.trim(buffer, threshold=0)`\r\n### `util.trimLeft(buffer, threshold=0)`\r\n### `util.trimRight(buffer, threshold=0)`\r\n\r\nCreate buffer with trimmed zeros from the start and/or end, by the threshold amplitude.\r\n\r\n### `util.mix(bufferA, bufferB, ratio|(valA, valB, i, channel)=>val?, offset=0)`\r\nMix second buffer into the first one. Pass optional weight value or mixing function.\r\n\r\n### `util.size(buffer)`\r\nReturn buffer size, in bytes. Use [pretty-bytes](https://npmjs.org/package/pretty-bytes) package to format bytes to a string, if needed.\r\n\r\n### `util.data(buffer, data?)`\r\nGet channels' data in array. Pass existing array to transfer the data to it.\r\nUseful in audio-workers to transfer buffer to output.\r\n\r\n```js\r\nlet a = util.create(3, 2)\r\n\r\nlet audioData = util.data(a) // [[0,0,0], [0,0,0]]\r\n```\r\n\r\n## Related\r\n\r\n> [audio-buffer](https://github.com/audiojs/audio-buffer) — audio data container, both for node/browser.
\r\n> [audio-buffer-list](https://github.com/audiojs/audio-buffer-list) — linked audio buffers sequence structure
\r\n> [audio](https://github.com/audiojs/audio) — class for high-level audio manipulations, comprising the functionality of above mentioned.\r\n> [ciseaux](https://github.com/mohayonao/ciseaux)\r\n\r\n## Credits\r\n\r\nThanks to [**@jaz303**](https://github.com/jaz303/) for [the initial idea](https://github.com/jaz303/audio-buffer-utils) and collaboration.\r\n","_attachments":{},"homepage":"https://github.com/audiojs/audio-buffer-utils","bugs":{"url":"https://github.com/audiojs/audio-buffer-utils/issues"},"license":"ISC"}