以特定时间间隔合并音频文件并下载合并好的音频
// ==UserScript==
// @name 语音维基合并当前页音频
// @namespace http://tampermonkey.net/
// @version 1.1
// @description 以特定时间间隔合并音频文件并下载合并好的音频
// @author You
// @match https://voicewiki.cn/wiki/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=voicewiki.cn
// @grant none
// ==/UserScript==
(async function() {
'use strict';
// Function to merge audio files with a 1-second gap
async function mergeAudio(audioUrls) {
const audioContext = new AudioContext();
// Helper function to fetch and decode audio data
async function fetchAndDecode(url) {
const response = await fetch(url);
const arrayBuffer = await response.arrayBuffer();
return audioContext.decodeAudioData(arrayBuffer);
}
// Fetch and decode all audio data asynchronously
const audioDataArray = await Promise.all(audioUrls.map(fetchAndDecode));
// Output some information for debugging
console.log('音频数据数组:', audioDataArray);
// 设置间隔
var intersec = 1
// Calculate the total length of the merged audio
const totalFrames = audioDataArray.reduce((acc, data) => acc + data.length + (intersec * audioContext.sampleRate), 0);
// Output the total frames for debugging
console.log('总帧数:', totalFrames);
// Create the output buffer with the calculated totalFrames
const outputBuffer = audioContext.createBuffer(1, totalFrames, audioContext.sampleRate);
const outputData = outputBuffer.getChannelData(0);
let offset = 0;
// Copy each decoded audio data to the output buffer
for (const data of audioDataArray) {
// Output some information about each data for debugging
console.log('数据长度:', data.length);
// Ensure the offset stays within bounds
if (offset + data.length + (intersec * audioContext.sampleRate) > outputData.length) {
console.warn('偏移量超出范围。正在调整。');
const availableSpace = outputData.length - offset;
outputData.set(data.getChannelData(0).subarray(0, availableSpace), offset);
} else {
outputData.set(data.getChannelData(0), offset);
}
offset += data.length + (intersec * audioContext.sampleRate); // Move offset by the length of the source data
}
return outputBuffer;
}
// Function to download the merged audio as WAV
function downloadAudio(buffer) {
const audioContext = new AudioContext(); // Add this line to declare audioContext
// Prompt for a filename
const filename = prompt('请输入文件名（不包括扩展名）:', 'merged_audio');
if (filename === null) {
// User pressed cancel
return;
}
const blob = bufferToBlob(buffer, audioContext);
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${filename}.wav`; // Add the filename and extension
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
// Helper function to convert an AudioBuffer to a Blob
function bufferToBlob(buffer, audioContext) {
const interleaved = interleaveChannels(buffer);
const wavData = encodeWAV(interleaved, audioContext.sampleRate);
return new Blob([wavData], { type: 'audio/wav' });
}
// Helper function to interleave audio data channels
function interleaveChannels(buffer) {
const channels = [];
for (let i = 0; i < buffer.numberOfChannels; i++) {
channels.push(buffer.getChannelData(i));
}
const interleaved = new Float32Array(buffer.length * buffer.numberOfChannels);
let offset = 0;
for (let i = 0; i < buffer.length; i++) {
for (let j = 0; j < buffer.numberOfChannels; j++) {
interleaved[offset++] = channels[j][i];
}
}
return interleaved;
}
// Helper function to encode interleaved audio data as WAV
function encodeWAV(samples, sampleRate) {
const buffer = new ArrayBuffer(44 + samples.length * 2);
const view = new DataView(buffer);
// Write WAV header
writeString(view, 0, 'RIFF');
view.setUint32(4, 36 + samples.length * 2, true);
writeString(view, 8, 'WAVE');
writeString(view, 12, 'fmt ');
view.setUint32(16, 16, true);
view.setUint16(20, 1, true);
view.setUint16(22, 1, true);
view.setUint32(24, sampleRate, true);
view.setUint32(28, sampleRate * 4, true);
view.setUint16(32, 4, true);
view.setUint16(34, 16, true);
writeString(view, 36, 'data');
view.setUint32(40, samples.length * 2, true);
// Write audio data
const dataView = new Int16Array(buffer, 44);
for (let i = 0; i < samples.length; i++) {
const s = Math.max(-1, Math.min(1, samples[i]));
dataView[i] = s < 0 ? s * 0x8000 : s * 0x7FFF;
}
return buffer;
}
// Helper function to write a string to a DataView
function writeString(view, offset, string) {
for (let i = 0; i < string.length; i++) {
view.setUint8(offset + i, string.charCodeAt(i));
}
}
// Use the downloadAudio function in your button click event
// 创建并附加粘性按钮
const button = document.createElement('button');
button.innerHTML = '合并并下载音频';
button.style.position = 'fixed';
button.style.top = '65px'; // 根据需要调整顶部位置
button.style.left = '10px'; // 根据需要调整左侧位置
button.style.zIndex = '99999';
button.style.padding = '0.5em';
button.style.borderRadius = '0.5em 0px 0.5em 0px';
button.style.background = '#fff039';
button.addEventListener('click', async () => {
try {
// 从按钮元素中提取音频URL
const audioUrls = Array.from(document.querySelectorAll('.audio-player-button audio')).map(audio => audio.src);
console.log('音频URL:', audioUrls);
// 确保至少有一个音频URL
if (audioUrls.length === 0) {
throw new Error('未找到音频URL。');
}
const mergedBuffer = await mergeAudio(audioUrls);
downloadAudio(mergedBuffer);
} catch (error) {
console.error('合并音频时发生错误:', error.message);
}
});
document.body.appendChild(button);
})();