【发布时间】:2019-12-23 09:03:21
【问题描述】:
我正在通过 JavaScript 捕获音频数据,并打算将其作为 base64 编码的字符串发送。在我发送之前,我只是在测试我是否可以重建它并播放它,而且我的运气并不好。
在控制台中,blob 如下所示:
如何从 reader.readAsDataURL(audioBlob) 生成的 base64 编码数据中检索初始 audioBlob 对象,以便以正确的形式播放它?
mediaRecorder.addEventListener("dataavailable", function(event) {
audioChunks.push(event.data);
var audioBlob = new Blob(audioChunks);
// PLAYBACK WORKS HERE!
var audioUrl = URL.createObjectURL(audioBlob);
var audio = new Audio(audioUrl);
audio.play();
var reader = new FileReader();
reader.onload = function(event){
var audioData = event.target.result;
// extracting and decoding just the bas64 data, attempting to reconstruct audioBlob
var base64 = audioData.substr(audioData.lastIndexOf(',') + 1);
var decoded = atob(base64);
var reconstructedAudioBlob = new Blob([decoded], {type: "audio/webm;codecs=opus"});
// PLAYBACK FAILS HERE!
var reconstructedAudioUrl = URL.createObjectURL(reconstructedAudioBlob);
var reconstructedAudio = new Audio(reconstructedAudioUrl);
reconstructedAudio.play();
};
reader.readAsDataURL(audioBlob);
});
这会导致控制台错误:Uncaught (in promise) DOMException
event.target.result的数据(如果你设法解码并播放它,尽情享受吧!)如下:
数据:应用/八位字节流;的base64,GkXfo59ChoEBQveBAULygQRC84EIQoKEd2VibUKHgQRChYECGFOAZwH ///////// FUmpZpkq17GDD0JATYCGQ2hyb21lV0GGQ2hyb21lFlSua7 + uvdeBAXPFhyclHzqvN7GDgQKGhkFfT1BVU2Oik09wdXNIZWFkAQEAAIC7AAAAAADhjbWERzuAAJ + BAWJkgSAfQ7Z1Af ///////// ngQCjQYaBAACA + 4OzXnuBgl3yyb73GghmlCLmSdXgQI06MTtujZRqPyATqeUwfvNvGcyG294bqH2N0pn9suUh0Isrnb + 78cMVsv3mrXfgvINYLCWNse + 9ZdGNrhK7p + UEU ++ U0fuF9PT1U1C3EJ9vGtZdrExDWxkSdBqe2bVXeRN4UmR / PwuoGqKhZyOrqv4dAiLQWOb57aehbFKajj0G1OJCohFYWMurToiKnWuyC9KnMug1XaIhWBwy0 / xYspbtXi5Z1KmTaxUdk6UFCSjZ3lxZzuUZc / O + llp74d4Fygx8HBfXDACq2QuEwAIR + rOm3o70e6i8D7h4dr + Vk1B3e8sN5ne8aPNZzjR0hKdKkPz9hW8GMPll52vyNATvHlrp + h9oK6LiY3R6NcS7ymyf9leiFca4ODU1JNkLqkRkU0OfZV / RFr5GXnv6VWt3H8daXb6EvJthit13hE0rWmV5jqUQnhGpHJkzOF0oHENZgn9137y + Ncn9Ip8vJ9ixM / EJARaU9kVEgAX + QwGjQYOBADuA + wNQq5l3a6QOWw1TF8RnsJg5eo8aEzKN1x95c4EvryMVl4VtdcNuFxNF / UTnxApLOQjn0j7tvdy2XnCCZjeiT2v2dPxW1ISZ7OBMv1g4r1e / KWdUSNyBXrs / rbCMhUNUFezU8U6Xj9 / 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