111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
// Copyright (c) 2023 Xiaomi Corporation (authors: Fangjun Kuang)
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//
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const fs = require('fs');
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const {Readable} = require('stream');
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const wav = require('wav');
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const sherpa_onnx = require('sherpa-onnx');
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function createOnlineRecognizer() {
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let onlineZipformer2CtcModelConfig = {
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model:
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'./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/ctc-epoch-30-avg-3-chunk-16-left-128.int8.onnx',
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};
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let onlineModelConfig = {
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zipformer2Ctc: onlineZipformer2CtcModelConfig,
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tokens: './sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/tokens.txt',
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numThreads: 1,
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provider: 'cpu',
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debug: 0,
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modelType: '',
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};
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let featureConfig = {
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sampleRate: 16000,
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featureDim: 80,
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};
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let recognizerConfig = {
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featConfig: featureConfig,
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modelConfig: onlineModelConfig,
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decodingMethod: 'greedy_search',
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maxActivePaths: 4,
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enableEndpoint: 1,
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rule1MinTrailingSilence: 2.4,
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rule2MinTrailingSilence: 1.2,
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rule3MinUtteranceLength: 20,
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ctcFstDecoderConfig: {
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graph: './sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/HLG.fst',
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maxActive: 3000,
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}
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};
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return sherpa_onnx.createOnlineRecognizer(recognizerConfig);
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}
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const recognizer = createOnlineRecognizer();
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const stream = recognizer.createStream();
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const waveFilename =
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'./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/test_wavs/8k.wav';
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const reader = new wav.Reader();
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const readable = new Readable().wrap(reader);
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function decode(samples) {
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stream.acceptWaveform(gSampleRate, samples);
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while (recognizer.isReady(stream)) {
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recognizer.decode(stream);
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}
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const text = recognizer.getResult(stream).text;
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console.log(text);
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}
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let gSampleRate = 16000;
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reader.on('format', ({audioFormat, bitDepth, channels, sampleRate}) => {
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gSampleRate = sampleRate;
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if (audioFormat != 1) {
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throw new Error(`Only support PCM format. Given ${audioFormat}`);
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}
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if (channels != 1) {
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throw new Error(`Only a single channel. Given ${channel}`);
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}
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if (bitDepth != 16) {
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throw new Error(`Only support 16-bit samples. Given ${bitDepth}`);
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}
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});
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fs.createReadStream(waveFilename, {'highWaterMark': 4096})
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.pipe(reader)
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.on('finish', function(err) {
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// tail padding
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const floatSamples =
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new Float32Array(recognizer.config.featConfig.sampleRate * 0.5);
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decode(floatSamples);
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stream.free();
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recognizer.free();
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});
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readable.on('readable', function() {
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let chunk;
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while ((chunk = readable.read()) != null) {
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const int16Samples = new Int16Array(
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chunk.buffer, chunk.byteOffset,
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chunk.length / Int16Array.BYTES_PER_ELEMENT);
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const floatSamples = new Float32Array(int16Samples.length);
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for (let i = 0; i < floatSamples.length; i++) {
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floatSamples[i] = int16Samples[i] / 32768.0;
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}
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decode(floatSamples);
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}
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});
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