community_icon_html = """"""
loading_icon_html = """"""
share_js = """async () => {
async function uploadFile(file){
const UPLOAD_URL = 'https://huggingface.co/uploads';
const response = await fetch(UPLOAD_URL, {
method: 'POST',
headers: {
'Content-Type': 'audio/wav',
'X-Requested-With': 'XMLHttpRequest',
},
body: file, /// <- File inherits from Blob
});
const url = await response.text();
return url;
}
function audioResample(buffer, sampleRate){
const offlineCtx = new OfflineAudioContext(2, (buffer.length / buffer.sampleRate) * sampleRate, sampleRate);
const source = offlineCtx.createBufferSource();
source.buffer = buffer;
source.connect(offlineCtx.destination);
source.start();
return offlineCtx.startRendering();
};
function audioReduceChannels(buffer, targetChannelOpt){
if(targetChannelOpt === 'both' || buffer.numberOfChannels < 2) return buffer;
const outBuffer = new AudioBuffer({
sampleRate: buffer.sampleRate,
length: buffer.length,
numberOfChannels: 1
});
const data = [buffer.getChannelData(0), buffer.getChannelData(1)];
const newData = new Float32Array(buffer.length);
for(let i = 0; i < buffer.length; ++i)
newData[i] =
targetChannelOpt === 'left'? data[0][i] :
targetChannelOpt === 'right'? data[1][i] :
(data[0][i] + data[1][i]) / 2 ;
outBuffer.copyToChannel(newData, 0);
return outBuffer;
};
function audioNormalize(buffer){
const data = Array.from(Array(buffer.numberOfChannels)).map((_, idx) => buffer.getChannelData(idx));
const maxAmplitude = Math.max(...data.map(chan => chan.reduce((acc, cur) => Math.max(acc, Math.abs(cur)), 0)));
if(maxAmplitude >= 1.0) return buffer;
const coeff = 1.0 / maxAmplitude;
data.forEach(chan => {
chan.forEach((v, idx) => chan[idx] = v*coeff);
buffer.copyToChannel(chan, 0);
});
return buffer;
};
async function processAudioFile(
audioBufferIn,
targetChannelOpt,
targetSampleRate
) {
const resampled = await audioResample(audioBufferIn, targetSampleRate);
const reduced = audioReduceChannels(resampled, targetChannelOpt);
const normalized = audioNormalize(reduced);
return normalized;
}
function audioToRawWave(audioChannels, bytesPerSample, mixChannels=false) {
const bufferLength = audioChannels[0].length;
const numberOfChannels = audioChannels.length === 1 ? 1 : 2;
const reducedData = new Uint8Array(
bufferLength * numberOfChannels * bytesPerSample
);
for (let i = 0; i < bufferLength; ++i) {
for (
let channel = 0;
channel < (mixChannels ? 1 : numberOfChannels);
++channel
) {
const outputIndex = (i * numberOfChannels + channel) * bytesPerSample;
let sample;
if (!mixChannels) sample = audioChannels[channel][i];
else
sample =
audioChannels.reduce((prv, cur) => prv + cur[i], 0) /
numberOfChannels;
sample = sample > 1 ? 1 : sample < -1 ? -1 : sample; //check for clipping
//bit reduce and convert to Uint8
switch (bytesPerSample) {
case 2:
sample = sample * 32767;
reducedData[outputIndex] = sample;
reducedData[outputIndex + 1] = sample >> 8;
break;
case 1:
reducedData[outputIndex] = (sample + 1) * 127;
break;
default:
throw "Only 8, 16 bits per sample are supported";
}
}
}
return reducedData;
}
function makeWav(data, channels, sampleRate, bytesPerSample) {
const headerLength = 44;
var wav = new Uint8Array(headerLength + data.length);
var view = new DataView(wav.buffer);
view.setUint32(0, 1380533830, false); // RIFF identifier 'RIFF'
view.setUint32(4, 36 + data.length, true); // file length minus RIFF identifier length and file description length
view.setUint32(8, 1463899717, false); // RIFF type 'WAVE'
view.setUint32(12, 1718449184, false); // format chunk identifier 'fmt '
view.setUint32(16, 16, true); // format chunk length
view.setUint16(20, 1, true); // sample format (raw)
view.setUint16(22, channels, true); // channel count
view.setUint32(24, sampleRate, true); // sample rate
view.setUint32(28, sampleRate * bytesPerSample * channels, true); // byte rate (sample rate * block align)
view.setUint16(32, bytesPerSample * channels, true); // block align (channel count * bytes per sample)
view.setUint16(34, bytesPerSample * 8, true); // bits per sample
view.setUint32(36, 1684108385, false); // data chunk identifier 'data'
view.setUint32(40, data.length, true); // data chunk length
wav.set(data, headerLength);
return new Blob([wav.buffer], { type: "audio/wav" });
}
const gradioEl = document.querySelector('body > gradio-app');
const audioEl = gradioEl.querySelector('audio');
const resultTxt = gradioEl.querySelector('#result-textarea textarea').value;
const shareBtnEl = gradioEl.querySelector('#share-btn');
const shareIconEl = gradioEl.querySelector('#share-btn-share-icon');
const loadingIconEl = gradioEl.querySelector('#share-btn-loading-icon');
if(!audioEl){
return;
};
shareBtnEl.style.pointerEvents = 'none';
shareIconEl.style.display = 'none';
loadingIconEl.style.removeProperty('display');
const res = await fetch(audioEl.src);
const blob = await res.blob();
const channelOpt = "both";
const sampleRate = 48000;
const bytesPerSample = 1; // or 2
const audioBufferIn = await new AudioContext().decodeAudioData(
await blob.arrayBuffer()
);
const audioBuffer = await processAudioFile(
audioBufferIn,
channelOpt,
sampleRate
);
const rawData = audioToRawWave(
channelOpt === "both"
? [audioBuffer.getChannelData(0), audioBuffer.getChannelData(1)]
: [audioBuffer.getChannelData(0)],
bytesPerSample
);
const blobWav = makeWav(
rawData,
channelOpt === "both" ? 2 : 1,
sampleRate,
bytesPerSample
);
const fileName = `whisper-demo-input.wav`;
const audioFile = new File([blobWav], fileName, { type: 'audio/wav' });
const url = await uploadFile(audioFile);
const descriptionMd = `#### Input audio:
#### Transcription:
> ${resultTxt}`;
const params = new URLSearchParams({
description: descriptionMd,
});
const paramsStr = params.toString();
window.open(`${window.location.href}/discussions/new?${paramsStr}`, '_blank');
shareBtnEl.style.removeProperty('pointer-events');
shareIconEl.style.removeProperty('display');
loadingIconEl.style.display = 'none';
}"""