├── .gitignore ├── .npmignore ├── LICENSE.md ├── README.md ├── decode.js ├── encode.js ├── index.js ├── lib └── common.js ├── package-lock.json ├── package.json └── test ├── cli.js ├── convert.js ├── fixtures ├── Indoor_switch_small_on_01.qoa ├── Indoor_switch_small_on_01.qoa.wav ├── Indoor_switch_small_on_01.wav ├── sting_banjo_humorous_02.qoa ├── sting_banjo_humorous_02.qoa.wav └── sting_banjo_humorous_02.wav ├── sine.js ├── test.js ├── webaudio.html └── webaudio.js /.gitignore: -------------------------------------------------------------------------------- 1 | bower_components 2 | node_modules 3 | *.log 4 | .DS_Store 5 | test/fixtures/sine.wav 6 | test/fixtures/sine-qoa.wav 7 | test/fixtures/sine.qoa -------------------------------------------------------------------------------- /.npmignore: -------------------------------------------------------------------------------- 1 | bower_components 2 | node_modules 3 | *.log 4 | .DS_Store 5 | .npmignore 6 | LICENSE.md 7 | test/ -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | Copyright (c) 2020 Matt DesLauriers 3 | 4 | Permission is hereby granted, free of charge, to any person obtaining a copy 5 | of this software and associated documentation files (the "Software"), to deal 6 | in the Software without restriction, including without limitation the rights 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | copies of the Software, and to permit persons to whom the Software is 9 | furnished to do so, subject to the following conditions: 10 | 11 | The above copyright notice and this permission notice shall be included in all 12 | copies or substantial portions of the Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 15 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 17 | IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18 | DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19 | OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 20 | OR OTHER DEALINGS IN THE SOFTWARE. 21 | 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # qoa-format 2 | 3 | A JavaScript port of [The "Quite OK Audio" (QOA) format](https://github.com/phoboslab/qoa), a lossy audio compression that achieves relatively decent compression with fast decoding and not much complexity. Also see [this](https://phoboslab.org/log/2023/02/qoa-time-domain-audio-compression) blog post by @phoboslab. 4 | 5 | Features: 6 | 7 | - Lossy, time domain audio compression format with a constrained bitrate of 277 kbits/s for stereo 44100 Hz 8 | - This pure JavaScript encoder / decoder implementation bundles to about 6kb minified (or 3kb for just the decoder) 9 | - Works in Node.js and the browser without any specific audio APIs 10 | - Rough decoding performance tests on MBP M1 Max in Chrome show similar performance to WebAudio `decodeAudioData` 11 | - The audio format and encoder/decoder is open source and MIT licensed 12 | 13 | _This software is still experimental, unstable, and likely to change or break. Use at your own risk._ 14 | 15 | ## ⚠️ Warning 16 | 17 | If you are hacking and experimenting with this, take care when using headphones as garbage data may produced loud noises that can damage hearing. 18 | 19 | As the spec is still in flux, this may not correctly decode files generated by different versions of [the C encoder](https://github.com/phoboslab/qoa/) or third-party implementations. This has been tested against [this particular QOA commit tree](https://github.com/phoboslab/qoa/tree/e8386f41d435a864ce2890e9f56d964215b40301) when building from source on macOS. 20 | 21 | ## Example 22 | 23 | ```js 24 | import { encode, decode } from 'qoa-format'; 25 | 26 | // or just the decode/encode function - 27 | // import decode from 'qoa-format/decode.js'; 28 | 29 | // Encoding raw audio samples 30 | const audioData = { 31 | sampleRate: 44100 32 | channelData: [ 33 | new Float32Array([ /* audio samples */ ]) 34 | ] 35 | } 36 | 37 | // lossy encode raw audio samples to Uint8Array QOA file 38 | const qoaFile = encode(audioData) 39 | 40 | // Decode QOA file back to audio data 41 | const decodedAudio = decode(qoaFile); 42 | 43 | // Show info about the decoded file 44 | console.log(decodedAudio.sampleRate); // 44100 45 | console.log(decodedAudio.channels); // 1 46 | console.log(decodedAudio.samples); // (number of samples in audio signal) 47 | console.log(decodedAudio.channelData); // [ Float32Array(samples) ] 48 | ``` 49 | 50 | See [test/sine.js](./test/sine.js) for encoding/decoding a 441 Hz sine wave, and [test/webaudio.js](./test/webaudio.js) for a decoder and web audio QOA player. 51 | 52 | ## Install 53 | 54 | Use [npm](https://npmjs.com/) to install. 55 | 56 | ```sh 57 | npm install qoa-format --save 58 | ``` 59 | 60 | ## API Usage 61 | 62 | #### `data = encode({ channelData, sampleRate })` 63 | 64 | Encodes the audio signal in `channelData` with `sampleRate` as a QOA file, returning `data` as a `Uint8Array`. The length of `channelData` determines the number of channels (mono, stereo, multi-channel), and each element is expected to be a `Float32Array` with the same length (i.e. `samples` or number of sample frames). The signal is expected to range from `-1..1`. 65 | 66 | #### `audio = decode(Uint8Array | Buffer)` 67 | 68 | Decodes the `Uint8Array` or `Buffer` object into an `audio` specifier which has the following format: 69 | 70 | ``` 71 | { 72 | sampleRate, // in Hz 73 | channels, // number of channels 74 | samples, // number of frame samples per channel 75 | channelData: [ 76 | // an array of audio samples for each channel 77 | Float32Array(samples), 78 | ... 79 | ] 80 | } 81 | ``` 82 | 83 | ## Run from Source 84 | 85 | Once cloned, you can `npm install` and then run the test: 86 | 87 | ```sh 88 | npm run test 89 | ``` 90 | 91 | Or the HTML/WebAudio test, run the below command and then open [http://localhost:8000/test/webaudio.html](http://localhost:8000/test/webaudio.html). **Note:** Take caution when wearing headphones if you are hacking with this. 🎧 92 | 93 | ```sh 94 | npm run test:browser 95 | ``` 96 | 97 | Or run the CLI to convert files: 98 | 99 | ```sh 100 | # encode WAV to QOA 101 | node test/cli.js input.wav output.qoa 102 | 103 | # decode QOA to WAV 104 | node test/cli.js output.qoa converted.wav 105 | ``` 106 | 107 | ## TODOs 108 | 109 | - A more optimized BitStream reader/writer could be added to this module to remove a dependency, produce a smaller build size, and potentially improve performance. 110 | - The QOA format is easily seekable, this should be exposed in the API to allow fast seeking and audio streaming on the web 111 | 112 | ## Credits 113 | 114 | - QOA format by @phoboslab 115 | - JavaScript port by @mattdesl 116 | - Thanks to @thi.ng for the BitStream decoder 117 | 118 | ## License 119 | 120 | MIT, see [LICENSE.md](http://github.com/mattdesl/qoa-format/blob/master/LICENSE.md) for details. 121 | -------------------------------------------------------------------------------- /decode.js: -------------------------------------------------------------------------------- 1 | import { BitInputStream } from "@thi.ng/bitstream"; 2 | import { 3 | qoa_lms_predict, 4 | qoa_lms_update, 5 | qoa_clamp, 6 | qoa_dequant_tab, 7 | LMS, 8 | QOA_MIN_FILESIZE, 9 | QOA_SLICE_LEN, 10 | QOA_MAGIC, 11 | QOA_LMS_LEN, 12 | } from "./lib/common.js"; 13 | 14 | function decodeHeader(stream) { 15 | const magic = stream.read(32); 16 | if (magic !== QOA_MAGIC) { 17 | throw new Error(`Not a QOA file; expected magic number 'qoaf'`); 18 | } 19 | 20 | // peek first frame to get audio file data 21 | const header = { 22 | samples: stream.read(32), 23 | channels: stream.read(8), 24 | sampleRate: stream.read(24), 25 | }; 26 | 27 | // go back to end of header 28 | stream.seek(64); 29 | 30 | // return data 31 | return header; 32 | } 33 | 34 | function qoa_decode_frame(stream, audio, lmses, channelData, sampleOffset) { 35 | const channels = stream.read(8); 36 | const sampleRate = stream.read(24); 37 | const samples = stream.read(16); // frame samples 38 | const frameSize = stream.read(16); 39 | 40 | const dataSize = Math.floor(frameSize - 8 - QOA_LMS_LEN * 4 * channels); 41 | const numSlices = Math.floor(dataSize / 8); 42 | const maxTotalSamples = numSlices * QOA_SLICE_LEN; 43 | 44 | if ( 45 | channels != audio.channels || 46 | sampleRate != audio.sampleRate || 47 | samples * channels > maxTotalSamples 48 | ) { 49 | throw new Error(`invalid frame header data`); 50 | } 51 | 52 | // decode LMS history and weights 53 | for (let c = 0; c < channels; c++) { 54 | const lms = lmses[c]; 55 | for (let i = 0; i < QOA_LMS_LEN; i++) { 56 | let h = stream.read(16); 57 | lms.history[i] = h; 58 | } 59 | for (let i = 0; i < QOA_LMS_LEN; i++) { 60 | let w = stream.read(16); 61 | lms.weights[i] = w; 62 | } 63 | } 64 | 65 | for ( 66 | let sample_index = 0; 67 | sample_index < samples; 68 | sample_index += QOA_SLICE_LEN 69 | ) { 70 | for (let c = 0; c < channels; c++) { 71 | const scalefactor = stream.read(4); 72 | const table = qoa_dequant_tab[scalefactor]; 73 | const slice_start = sample_index; 74 | const slice_end = Math.min(sample_index + QOA_SLICE_LEN, samples); 75 | const slice_count = slice_end - slice_start; 76 | const lms = lmses[c]; 77 | const sampleData = channelData[c]; 78 | let idx = sampleOffset + slice_start; 79 | const weights = lms.weights; 80 | const history = lms.history; 81 | let bitsRemaining = 60; 82 | // note: this loop is a hot code path and could be optimized 83 | for (let i = 0; i < slice_count; i++) { 84 | const predicted = qoa_lms_predict(weights, history); 85 | const quantized = stream.read(3); 86 | const dequantized = table[quantized]; 87 | const reconstructed = qoa_clamp(predicted + dequantized, -32768, 32767); 88 | const sample = 89 | reconstructed < 0 ? reconstructed / 32768 : reconstructed / 32767; 90 | sampleData[idx++] = sample; 91 | qoa_lms_update(weights, history, reconstructed, dequantized); 92 | bitsRemaining -= 3; 93 | } 94 | // skip stream if needed 95 | if (bitsRemaining > 0) { 96 | stream.read(bitsRemaining); 97 | } 98 | } 99 | } 100 | 101 | return samples; 102 | } 103 | 104 | export default function decode(data) { 105 | if (data.byteLength < QOA_MIN_FILESIZE) { 106 | throw new Error(`QOA file size must be >= ${QOA_MIN_FILESIZE}`); 107 | } 108 | 109 | const stream = new BitInputStream(data); 110 | const audio = decodeHeader(stream); 111 | 112 | const channelData = []; 113 | const lmses = []; 114 | for (let c = 0; c < audio.channels; c++) { 115 | const d = new Float32Array(audio.samples); 116 | channelData.push(d); 117 | lmses.push(LMS()); 118 | } 119 | 120 | let sampleIndex = 0; 121 | let frameLen = 0; 122 | do { 123 | frameLen = qoa_decode_frame(stream, audio, lmses, channelData, sampleIndex); 124 | sampleIndex += frameLen; 125 | } while (frameLen && sampleIndex < audio.samples); 126 | 127 | return { 128 | ...audio, 129 | channelData, 130 | }; 131 | } 132 | -------------------------------------------------------------------------------- /encode.js: -------------------------------------------------------------------------------- 1 | import { BitOutputStream } from "@thi.ng/bitstream"; 2 | import { 3 | qoa_lms_predict, 4 | qoa_lms_update, 5 | qoa_clamp, 6 | qoa_dequant_tab, 7 | qoa_scalefactor_tab, 8 | LMS, 9 | QOA_SLICE_LEN, 10 | QOA_FRAME_LEN, 11 | QOA_MAGIC, 12 | QOA_LMS_LEN, 13 | QOA_FRAME_SIZE, 14 | } from "./lib/common.js"; 15 | 16 | /* The reciprocal_tab maps each of the 16 scalefactors to their rounded 17 | reciprocals 1/scalefactor. This allows us to calculate the scaled residuals in 18 | the encoder with just one multiplication instead of an expensive division. We 19 | do this in .16 fixed point with integers, instead of floats. 20 | 21 | The reciprocal_tab is computed as: 22 | reciprocal_tab[s] <- ((1<<16) + scalefactor_tab[s] - 1) / scalefactor_tab[s] */ 23 | 24 | const qoa_reciprocal_tab = qoa_scalefactor_tab.map((s) => 25 | Math.floor(((1 << 16) + s - 1) / s) 26 | ); 27 | 28 | /* The quant_tab provides an index into the dequant_tab for residuals in the 29 | range of -8 .. 8. It maps this range to just 3bits and becommes less accurate at 30 | the higher end. Note that the residual zero is identical to the lowest positive 31 | value. This is mostly fine, since the qoa_div() function always rounds away 32 | from zero. */ 33 | 34 | const qoa_quant_tab = [ 35 | // -8..-1 36 | 7, 7, 7, 5, 5, 3, 3, 1, 37 | // 0 38 | 0, 39 | // 1.. 8 40 | 0, 2, 2, 4, 4, 6, 6, 6, 41 | ]; 42 | 43 | /* qoa_div() implements a rounding division, but avoids rounding to zero for 44 | small numbers. E.g. 0.1 will be rounded to 1. Note that 0 itself still 45 | returns as 0, which is handled in the qoa_quant_tab[]. 46 | qoa_div() takes an index into the .16 fixed point qoa_reciprocal_tab as an 47 | argument, so it can do the division with a cheaper integer multiplication. */ 48 | 49 | function qoa_div(v, scalefactor) { 50 | const reciprocal = qoa_reciprocal_tab[scalefactor]; 51 | let n = (v * reciprocal + (1 << 15)) >> 16; 52 | n = n + ((v > 0) - (v < 0)) - ((n > 0) - (n < 0)); /* round away from 0 */ 53 | return n; 54 | } 55 | 56 | function qoa_encode_frame(stream, audio, lmses, sample_offset, frame_len) { 57 | const channels = audio.channels; 58 | const sampleRate = audio.sampleRate; 59 | const channelData = audio.channelData; 60 | const samples = audio.samples; 61 | 62 | const slices = Math.floor((frame_len + QOA_SLICE_LEN - 1) / QOA_SLICE_LEN); 63 | const frame_size = QOA_FRAME_SIZE(channels, slices); 64 | 65 | // Frame header 66 | stream.write(channels, 8); 67 | stream.write(sampleRate, 24); 68 | stream.write(frame_len, 16); // frame samples 69 | stream.write(frame_size, 16); 70 | 71 | // write current LMS weights and history state 72 | for (let c = 0; c < channels; c++) { 73 | const lms = lmses[c]; 74 | 75 | /* If the weights have grown too large, reset them to 0. This may happen 76 | with certain high-frequency sounds. This is a last resort and will 77 | introduce quite a bit of noise, but should at least prevent pops/clicks */ 78 | const weights_sum = 79 | lms.weights[0] * lms.weights[0] + 80 | lms.weights[1] * lms.weights[1] + 81 | lms.weights[2] * lms.weights[2] + 82 | lms.weights[3] * lms.weights[3]; 83 | if (weights_sum > 0x2fffffff) { 84 | lms.weights[0] = 0; 85 | lms.weights[1] = 0; 86 | lms.weights[2] = 0; 87 | lms.weights[3] = 0; 88 | } 89 | 90 | for (let i = 0; i < QOA_LMS_LEN; i++) { 91 | stream.write(lms.history[i], 16); 92 | } 93 | for (let i = 0; i < QOA_LMS_LEN; i++) { 94 | stream.write(lms.weights[i], 16); 95 | } 96 | } 97 | 98 | /* We encode all samples with the channels interleaved on a slice level. 99 | E.g. for stereo: (ch-0, slice 0), (ch 1, slice 0), (ch 0, slice 1), ...*/ 100 | for ( 101 | let sample_index = 0; 102 | sample_index < frame_len; 103 | sample_index += QOA_SLICE_LEN 104 | ) { 105 | for (let c = 0; c < channels; c++) { 106 | const slice_len = qoa_clamp(QOA_SLICE_LEN, 0, frame_len - sample_index); 107 | const slice_start = sample_index; 108 | 109 | /* Brute for search for the best scalefactor. Just go through all 110 | 16 scalefactors, encode all samples for the current slice and 111 | meassure the total squared error. */ 112 | let best_error = Number.MAX_SAFE_INTEGER; 113 | let best_slice; 114 | let best_slice_scalefactor; 115 | let best_lms; 116 | const sampleData = channelData[c]; 117 | 118 | for (let scalefactor = 0; scalefactor < 16; scalefactor++) { 119 | /* We have to reset the LMS state to the last known good one 120 | before trying each scalefactor, as each pass updates the LMS 121 | state when encoding. */ 122 | let lms = LMS(lmses[c].history, lmses[c].weights); 123 | 124 | const table = qoa_dequant_tab[scalefactor]; 125 | 126 | // an array of slice data 127 | let slice = []; 128 | let current_error = 0; 129 | let idx = slice_start + sample_offset; 130 | 131 | for (let i = 0; i < slice_len; i++) { 132 | let sample = sampleData[idx++]; 133 | 134 | // turn into 16 bit signed integer 135 | sample = Math.floor( 136 | Math.fround(sample < 0 ? sample * 32768 : sample * 32767) 137 | ); 138 | sample = qoa_clamp(sample, -32768, 32767); 139 | 140 | let predicted = qoa_lms_predict(lms.weights, lms.history); 141 | let residual = sample - predicted; 142 | let scaled = qoa_div(residual, scalefactor); 143 | let clamped = qoa_clamp(scaled, -8, 8); 144 | let quantized = qoa_quant_tab[clamped + 8]; 145 | let dequantized = table[quantized]; 146 | let reconstructed = qoa_clamp(predicted + dequantized, -32768, 32767); 147 | let error = sample - reconstructed; 148 | current_error += error * error; 149 | if (current_error > best_error) { 150 | break; 151 | } 152 | 153 | qoa_lms_update(lms.weights, lms.history, reconstructed, dequantized); 154 | slice.push(quantized); 155 | } 156 | 157 | if (current_error < best_error) { 158 | best_error = current_error; 159 | best_slice = slice; 160 | best_slice_scalefactor = scalefactor; 161 | best_lms = lms; 162 | } 163 | } 164 | 165 | lmses[c] = best_lms; 166 | // first, write the 4bit scalefactor 167 | stream.write(best_slice_scalefactor, 4); 168 | // now write each 3bit datum in the slice 169 | for (let i = 0; i < QOA_SLICE_LEN; i++) { 170 | // the last frame of a file might be smaller than QOA_SLICE_LEN 171 | const v = i < best_slice.length ? best_slice[i] : 0; 172 | stream.write(v, 3); 173 | } 174 | } 175 | } 176 | } 177 | 178 | export default function encode({ channelData, sampleRate = 44100 } = {}) { 179 | const channels = channelData.length; 180 | const samples = channels >= 1 ? channelData[0].length : 0; 181 | const audio = { 182 | samples, 183 | channels, 184 | channelData, 185 | sampleRate, 186 | }; 187 | 188 | const num_frames = (samples + QOA_FRAME_LEN - 1) / QOA_FRAME_LEN; 189 | const num_slices = (samples + QOA_SLICE_LEN - 1) / QOA_SLICE_LEN; 190 | const encoded_size = 191 | 8 /* 8 byte file header */ + 192 | num_frames * 8 /* 8 byte frame headers */ + 193 | num_frames * 194 | QOA_LMS_LEN * 195 | 4 * 196 | audio.channels /* 4 * 4 bytes lms state per channel */ + 197 | num_slices * 8 * audio.channels; /* 8 byte slices */ 198 | 199 | const lmses = []; 200 | for (let c = 0; c < audio.channels; c++) { 201 | const lms = LMS(); 202 | lms.weights[0] = 0; 203 | lms.weights[1] = 0; 204 | lms.weights[2] = -(1 << 13); 205 | lms.weights[3] = 1 << 14; 206 | lmses.push(lms); 207 | } 208 | 209 | // write header 210 | const stream = new BitOutputStream(encoded_size); 211 | stream.write(QOA_MAGIC, 32); 212 | stream.write(samples, 32); 213 | 214 | let frame_len = QOA_FRAME_LEN; 215 | for ( 216 | let sample_index = 0; 217 | sample_index < samples; 218 | sample_index += frame_len 219 | ) { 220 | frame_len = qoa_clamp(QOA_FRAME_LEN, 0, samples - sample_index); 221 | qoa_encode_frame(stream, audio, lmses, sample_index, frame_len); 222 | } 223 | 224 | return stream.bytes(); 225 | } 226 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | import decode from "./decode.js"; 2 | import encode from "./encode.js"; 3 | 4 | export { encode, decode }; 5 | -------------------------------------------------------------------------------- /lib/common.js: -------------------------------------------------------------------------------- 1 | export const QOA_MIN_FILESIZE = 16; 2 | export const QOA_MAX_CHANNELS = 8; 3 | 4 | export const QOA_SLICE_LEN = 20; 5 | export const QOA_SLICES_PER_FRAME = 256; 6 | export const QOA_FRAME_LEN = QOA_SLICES_PER_FRAME * QOA_SLICE_LEN; 7 | export const QOA_LMS_LEN = 4; 8 | export const QOA_MAGIC = 0x716f6166; /* 'qoaf' */ 9 | export const QOA_FRAME_SIZE = (channels, slices) => 10 | Math.floor(8 + QOA_LMS_LEN * 4 * channels + 8 * slices * channels); 11 | 12 | export function qoa_clamp(v, min, max) { 13 | return v < min ? min : v > max ? max : v; 14 | } 15 | 16 | export function LMS(h, w) { 17 | const history = new Int16Array(h || 4); 18 | const weights = new Int16Array(w || 4); 19 | return { history, weights }; 20 | } 21 | 22 | export function qoa_lms_predict(weights, history) { 23 | return ( 24 | (weights[0] * history[0] + 25 | weights[1] * history[1] + 26 | weights[2] * history[2] + 27 | weights[3] * history[3]) >> 28 | 13 29 | ); 30 | } 31 | 32 | export function qoa_lms_update(weights, history, sample, residual) { 33 | let delta = residual >> 4; 34 | weights[0] += history[0] < 0 ? -delta : delta; 35 | weights[1] += history[1] < 0 ? -delta : delta; 36 | weights[2] += history[2] < 0 ? -delta : delta; 37 | weights[3] += history[3] < 0 ? -delta : delta; 38 | history[0] = history[1]; 39 | history[1] = history[2]; 40 | history[2] = history[3]; 41 | history[3] = sample; 42 | } 43 | 44 | export const qoa_round = (num) => Math.sign(num) * Math.round(Math.abs(num)); 45 | 46 | /* We have 16 different scalefactors. Like the quantized residuals these become 47 | less accurate at the higher end. In theory, the highest scalefactor that we 48 | would need to encode the highest 16bit residual is (2**16)/8 = 8192. However we 49 | rely on the LMS filter to predict samples accurately enough that a maximum 50 | residual of one quarter of the 16 bit range is high sufficent. I.e. with the 51 | scalefactor 2048 times the quant range of 8 we can encode residuals up to 2**14. 52 | 53 | The scalefactor values are computed as: 54 | scalefactor_tab[s] <- round(pow(s + 1, 2.75)) */ 55 | 56 | export const qoa_scalefactor_tab = Array(16) 57 | .fill() 58 | .map((_, s) => qoa_round(Math.pow(s + 1, 2.75))); 59 | 60 | /* The dequant_tab maps each of the scalefactors and quantized residuals to 61 | their unscaled & dequantized version. 62 | 63 | Since qoa_div rounds away from the zero, the smallest entries are mapped to 3/4 64 | instead of 1. The dequant_tab assumes the following dequantized values for each 65 | of the quant_tab indices and is computed as: 66 | float dqt[8] = {0.75, -0.75, 2.5, -2.5, 4.5, -4.5, 7, -7}; 67 | dequant_tab[s][q] <- round(scalefactor_tab[s] * dqt[q]) */ 68 | 69 | const dqt = [0.75, -0.75, 2.5, -2.5, 4.5, -4.5, 7, -7]; 70 | export const qoa_dequant_tab = qoa_scalefactor_tab.map((sf) => { 71 | return dqt.map((dq) => qoa_round(dq * sf)); 72 | }); 73 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "qoa-format", 3 | "version": "1.0.1", 4 | "lockfileVersion": 2, 5 | "requires": true, 6 | "packages": { 7 | "": { 8 | "name": "qoa-format", 9 | "version": "1.0.1", 10 | "license": "MIT", 11 | "dependencies": { 12 | "@thi.ng/bitstream": "^2.2.12" 13 | }, 14 | "devDependencies": { 15 | "audiobuffer-to-wav": "^1.0.0", 16 | "esbuild": "^0.17.6", 17 | 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"call-bind": "^1.0.2", 2567 | "for-each": "^0.3.3", 2568 | "gopd": "^1.0.1", 2569 | "has-tostringtag": "^1.0.0", 2570 | "is-typed-array": "^1.1.10" 2571 | } 2572 | }, 2573 | "wrappy": { 2574 | "version": "1.0.2", 2575 | "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", 2576 | "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==", 2577 | "dev": true 2578 | } 2579 | } 2580 | } 2581 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "qoa-format", 3 | "version": "1.0.1", 4 | "description": "", 5 | "main": "index.js", 6 | "type": "module", 7 | "license": "MIT", 8 | "author": { 9 | "name": "Matt DesLauriers", 10 | "email": "dave.des@gmail.com", 11 | "url": "https://github.com/mattdesl" 12 | }, 13 | "dependencies": { 14 | "@thi.ng/bitstream": "^2.2.12" 15 | }, 16 | "scripts": { 17 | "test": "node test/test.js", 18 | "test:browser": "esbuild test/webaudio.js --outdir=test --bundle --servedir=test" 19 | }, 20 | "keywords": [], 21 | "repository": { 22 | "type": "git", 23 | "url": "git://github.com/mattdesl/qoa-format.git" 24 | }, 25 | "homepage": "https://github.com/mattdesl/qoa-format", 26 | "bugs": { 27 | "url": "https://github.com/mattdesl/qoa-format/issues" 28 | }, 29 | "devDependencies": { 30 | "audiobuffer-to-wav": "^1.0.0", 31 | "esbuild": "^0.17.6", 32 | "minimist": "^1.2.7", 33 | "tape": "^5.6.3", 34 | "wav-decoder": "^1.3.0" 35 | } 36 | } 37 | -------------------------------------------------------------------------------- /test/cli.js: -------------------------------------------------------------------------------- 1 | import fs from "fs/promises"; 2 | import path from "path"; 3 | import minimist from "minimist"; 4 | import { decode as decodeWAV } from "wav-decoder"; 5 | import { decode, encode } from "../index.js"; 6 | import encodeWAV from "audiobuffer-to-wav"; 7 | 8 | const argv = minimist(process.argv.slice(2)); 9 | 10 | if (argv._.length !== 2) 11 | throw new Error( 12 | "invalid arguments, usage:\n node cli.js input.{qoa,wav} output.{qoa,wav}" 13 | ); 14 | 15 | const input = argv._[0]; 16 | const output = argv._[1]; 17 | run(input, output); 18 | 19 | async function run(input, output) { 20 | const inFormat = path.extname(input).toLowerCase(); 21 | const outFormat = path.extname(output).toLowerCase(); 22 | 23 | const formats = [".qoa", ".wav"]; 24 | 25 | if (inFormat === outFormat) 26 | throw new Error(`in and out formats are the same`); 27 | if (!formats.includes(inFormat) || !formats.includes(outFormat)) 28 | throw new Error("formats must be .wav or .qoa"); 29 | 30 | const inbuf = await fs.readFile(input); 31 | let outbuf, audio; 32 | 33 | if (inFormat == ".qoa") { 34 | // decode QOA and encode WAV 35 | audio = decode(inbuf); 36 | 37 | // mimic webaudio buffer 38 | const audioBuffer = { 39 | numberOfChannels: audio.channelData.length, 40 | sampleRate: audio.sampleRate, 41 | getChannelData(index) { 42 | return audio.channelData[index]; 43 | }, 44 | }; 45 | 46 | const arrayBuf = encodeWAV(audioBuffer); 47 | outbuf = new Uint8Array(arrayBuf); 48 | } else { 49 | // decode WAV and encode QOA 50 | audio = await decodeWAV(inbuf); 51 | outbuf = encode(audio); 52 | } 53 | 54 | const { channelData, sampleRate } = audio; 55 | const samples = channelData.length ? channelData[0].length : 0; 56 | const channels = channelData.length; 57 | console.log("Channels:", channels); 58 | console.log("Sample Rate:", sampleRate, "Hz"); 59 | console.log("Samples:", samples); 60 | console.log("Duration:", (samples / sampleRate).toFixed(2), "sec"); 61 | 62 | if (outbuf) { 63 | console.log("Writing:", output); 64 | await fs.writeFile(output, outbuf); 65 | } 66 | } 67 | -------------------------------------------------------------------------------- /test/convert.js: -------------------------------------------------------------------------------- 1 | import tape from "tape"; 2 | import fs from "fs/promises"; 3 | import * as url from "url"; 4 | import path from "path"; 5 | 6 | import * as common from "../lib/common.js"; 7 | import { encode, decode } from "../index.js"; 8 | import { decode as decodeWAV } from "wav-decoder"; 9 | import { readdirSync } from "fs"; 10 | import toWav from "audiobuffer-to-wav"; 11 | 12 | const __dirname = url.fileURLToPath(new URL(".", import.meta.url)); 13 | 14 | const inDir = path.resolve(__dirname, "fixtures"); 15 | const files = readdirSync(inDir).filter( 16 | (f) => /\.wav$/i.test(f) && !/\.qoa\.wav/i.test(f) 17 | ); 18 | 19 | for (let file of files) { 20 | console.log("Encoding", file); 21 | 22 | const input = await fs.readFile(path.resolve(inDir, file)); 23 | const { channelData, sampleRate } = await decodeWAV(input); 24 | 25 | const encoded = encode({ channelData, sampleRate }); 26 | 27 | const qoaFile = path.basename(file, path.extname(file)) + ".qoa"; 28 | const outputQOA = path.resolve(inDir, qoaFile); 29 | await fs.writeFile(outputQOA, Buffer.from(encoded)); 30 | 31 | console.log("Decoding", qoaFile); 32 | const audio = decode(encoded); 33 | 34 | const audioBuffer = { 35 | numberOfChannels: audio.channels, 36 | sampleRate: audio.sampleRate, 37 | getChannelData(index) { 38 | return audio.channelData[index]; 39 | }, 40 | }; 41 | const reEncoded = toWav(audioBuffer); 42 | console.log("Writing WAV encoding after conversion"); 43 | const outFile = path.resolve(inDir, qoaFile + ".wav"); 44 | await fs.writeFile(outFile, Buffer.from(reEncoded)); 45 | } 46 | -------------------------------------------------------------------------------- /test/fixtures/Indoor_switch_small_on_01.qoa: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/Indoor_switch_small_on_01.qoa -------------------------------------------------------------------------------- /test/fixtures/Indoor_switch_small_on_01.qoa.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/Indoor_switch_small_on_01.qoa.wav -------------------------------------------------------------------------------- /test/fixtures/Indoor_switch_small_on_01.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/Indoor_switch_small_on_01.wav -------------------------------------------------------------------------------- /test/fixtures/sting_banjo_humorous_02.qoa: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/sting_banjo_humorous_02.qoa -------------------------------------------------------------------------------- /test/fixtures/sting_banjo_humorous_02.qoa.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/sting_banjo_humorous_02.qoa.wav -------------------------------------------------------------------------------- /test/fixtures/sting_banjo_humorous_02.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mattdesl/qoa-format/66273accf656a9ad103bc1c64a75d0d3a33ba5b7/test/fixtures/sting_banjo_humorous_02.wav -------------------------------------------------------------------------------- /test/sine.js: -------------------------------------------------------------------------------- 1 | import fs from "fs/promises"; 2 | import path from "path"; 3 | import { decode, encode } from "../index.js"; 4 | import { decode as decodeWAV } from "wav-decoder"; 5 | import encodeWAVBuffer from "audiobuffer-to-wav"; 6 | import * as url from "url"; 7 | 8 | const __dirname = url.fileURLToPath(new URL(".", import.meta.url)); 9 | 10 | const sampleRate = 44100; 11 | const amplitude = 0.2; 12 | const seconds = 0.5; 13 | const tone = 441; // A 14 | 15 | const samples = Math.ceil(seconds * sampleRate); 16 | const sampleData = new Float32Array(samples); 17 | for (let i = 0; i < samples; i++) { 18 | sampleData[i] = sineWaveAt(i, tone, sampleRate) * amplitude; 19 | } 20 | 21 | // audio descriptor 22 | const audio = { 23 | sampleRate, 24 | channelData: [sampleData], 25 | }; 26 | 27 | const wav = encodeWAV(audio); 28 | 29 | const qoa = encode(audio); 30 | const converted = decode(qoa); 31 | const convertedWav = encodeWAV(converted); 32 | 33 | await fs.writeFile(path.resolve(__dirname, "fixtures/sine.qoa"), qoa); 34 | await fs.writeFile(path.resolve(__dirname, "fixtures/sine.wav"), wav); 35 | await fs.writeFile( 36 | path.resolve(__dirname, "fixtures/sine-qoa.wav"), 37 | convertedWav 38 | ); 39 | 40 | function sineWaveAt(sampleIndex, tone, sampleRate) { 41 | var sampleFreq = sampleRate / tone; 42 | return Math.sin(sampleIndex / (sampleFreq / (Math.PI * 2))); 43 | } 44 | 45 | function encodeWAV(audio) { 46 | const audioBuffer = { 47 | numberOfChannels: audio.channelData.length, 48 | sampleRate: audio.sampleRate, 49 | getChannelData(index) { 50 | return audio.channelData[index]; 51 | }, 52 | }; 53 | return new Uint8Array(encodeWAVBuffer(audioBuffer)); 54 | } 55 | -------------------------------------------------------------------------------- /test/test.js: -------------------------------------------------------------------------------- 1 | import tape from "tape"; 2 | import fs from "fs/promises"; 3 | import * as url from "url"; 4 | import path from "path"; 5 | 6 | import * as common from "../lib/common.js"; 7 | import { encode, decode } from "../index.js"; 8 | import { decode as decodeWAV } from "wav-decoder"; 9 | 10 | const __dirname = url.fileURLToPath(new URL(".", import.meta.url)); 11 | 12 | tape("should decode", async (t) => { 13 | // TODO: How best to test? 14 | // const input = await fs.readFile( 15 | // path.resolve(__dirname, "fixtures/sting_banjo_humorous_02.qoa") 16 | // ); 17 | // const output = await fs.readFile( 18 | // path.resolve(__dirname, "fixtures/sting_banjo_humorous_02-qoa.wav") 19 | // ); 20 | // const input2WAV = await fs.readFile( 21 | // path.resolve(__dirname, "fixtures/sting_banjo_humorous_02.wav") 22 | // ); 23 | // const expected02QOA = input; 24 | // const audioWAVInput = await decodeWAV(input2WAV); 25 | // const sampleRate = 44100; 26 | // const audioInfo = { 27 | // samples: sampleRate, 28 | // sampleRate, 29 | // channels: 1, 30 | // channelData: [new Float32Array(sampleRate)], 31 | // }; 32 | // t.doesNotThrow(() => encode(audioWAVInput)); 33 | // const encoded = encode(audioWAVInput); 34 | // t.ok( 35 | // Buffer.from(new Uint8Array(encoded)).equals(expected02QOA), 36 | // "files match" 37 | // ); 38 | // t.doesNotThrow(() => decode(new Uint8Array(encoded))); 39 | // t.doesNotThrow(() => decode(input)); 40 | // const expected = await decodeWAV(output); 41 | // const expectedData = expected.channelData; 42 | // const decodedAudio = decode(input); 43 | // const { channelData } = decodedAudio; 44 | // const eq = (a, b) => { 45 | // return Buffer.from(a.buffer).equals(Buffer.from(b.buffer)); 46 | // }; 47 | // t.ok(eq(channelData[0], expectedData[0]), "should be equal"); 48 | // t.ok(eq(channelData[1], expectedData[1]), "should be equal"); 49 | }); 50 | 51 | tape("dequant tab", async (t) => { 52 | const qoa_dequant_tab = [ 53 | [1, -1, 3, -3, 5, -5, 7, -7], 54 | [5, -5, 18, -18, 32, -32, 49, -49], 55 | [16, -16, 53, -53, 95, -95, 147, -147], 56 | [34, -34, 113, -113, 203, -203, 315, -315], 57 | [63, -63, 210, -210, 378, -378, 588, -588], 58 | [104, -104, 345, -345, 621, -621, 966, -966], 59 | [158, -158, 528, -528, 950, -950, 1477, -1477], 60 | [228, -228, 760, -760, 1368, -1368, 2128, -2128], 61 | [316, -316, 1053, -1053, 1895, -1895, 2947, -2947], 62 | [422, -422, 1405, -1405, 2529, -2529, 3934, -3934], 63 | [548, -548, 1828, -1828, 3290, -3290, 5117, -5117], 64 | [696, -696, 2320, -2320, 4176, -4176, 6496, -6496], 65 | [868, -868, 2893, -2893, 5207, -5207, 8099, -8099], 66 | [1064, -1064, 3548, -3548, 6386, -6386, 9933, -9933], 67 | [1286, -1286, 4288, -4288, 7718, -7718, 12005, -12005], 68 | [1536, -1536, 5120, -5120, 9216, -9216, 14336, -14336], 69 | ]; 70 | t.deepEqual(common.qoa_dequant_tab, qoa_dequant_tab, "qoa_dequant_tab"); 71 | const qoa_scalefactor_tab = [ 72 | 1, 7, 21, 45, 84, 138, 211, 304, 421, 562, 731, 928, 1157, 1419, 1715, 2048, 73 | ]; 74 | t.deepEqual( 75 | common.qoa_scalefactor_tab, 76 | qoa_scalefactor_tab, 77 | "qoa_scalefactor_tab" 78 | ); 79 | 80 | const qoa_reciprocal_tab = [ 81 | 65536, 9363, 3121, 1457, 781, 475, 311, 216, 156, 117, 90, 71, 57, 47, 39, 82 | 32, 83 | ]; 84 | // reciprocal_tab[s] <- ((1<<16) + scalefactor_tab[s] - 1) / scalefactor_tab[s] 85 | const qoa_reciprocal_tab_computed = common.qoa_scalefactor_tab.map((s) => 86 | Math.floor(((1 << 16) + s - 1) / s) 87 | ); 88 | t.deepEqual( 89 | qoa_reciprocal_tab_computed, 90 | qoa_reciprocal_tab, 91 | "qoa_reciprocal_tab" 92 | ); 93 | }); 94 | -------------------------------------------------------------------------------- /test/webaudio.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | decode 8 | 9 | 10 |
11 | WARNING: You should first try this without headphones, to avoid hearing 12 | damage in case of bugs or audio noise. 13 |
14 | 15 | 16 | 17 | 18 | -------------------------------------------------------------------------------- /test/webaudio.js: -------------------------------------------------------------------------------- 1 | import decode from "../decode.js"; 2 | 3 | async function load() { 4 | console.time("load"); 5 | const buffer = await ( 6 | await fetch("fixtures/sting_banjo_humorous_02.qoa") 7 | ).arrayBuffer(); 8 | console.timeEnd("load"); 9 | 10 | console.time("decode"); 11 | const out = decode(new Uint8Array(buffer)); 12 | console.timeEnd("decode"); 13 | return out; 14 | } 15 | 16 | async function play(audio) { 17 | const el = document.querySelector("#play"); 18 | el.disabled = true; 19 | 20 | const context = new AudioContext(); 21 | 22 | const audioBuffer = context.createBuffer( 23 | audio.channels, 24 | audio.samples, 25 | audio.sampleRate 26 | ); 27 | 28 | for (let i = 0; i < audio.channels; i++) { 29 | audioBuffer.copyToChannel(audio.channelData[i], i); 30 | } 31 | 32 | const source = context.createBufferSource(); 33 | source.buffer = audioBuffer; 34 | source.connect(context.destination); 35 | source.onended = () => { 36 | el.disabled = false; 37 | }; 38 | source.start(0); 39 | } 40 | 41 | (async () => { 42 | const audio = await load(); 43 | document.querySelector("#play").addEventListener("click", () => play(audio)); 44 | })(); 45 | --------------------------------------------------------------------------------