flask向网页实时传递音频流的前端后端完整代码
时间: 2023-10-19 09:35:33 浏览: 45
以下是一个基于Flask和WebSocket实现实时传递音频流的前后端完整代码:
后端代码(Flask):
```
from flask import Flask, render_template
from flask_socketio import SocketIO, emit
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)
@app.route('/')
def index():
return render_template('index.html')
@socketio.on('audio')
def handle_audio(audio):
emit('audio', audio, broadcast=True)
if __name__ == '__main__':
socketio.run(app)
```
前端代码(HTML + JavaScript):
```
<!DOCTYPE html>
<html>
<head>
<title>Real-time Audio Streaming</title>
<script src="//code.jquery.com/jquery-1.11.1.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.3.1/socket.io.js"></script>
</head>
<body>
<h1>Real-time Audio Streaming</h1>
<audio id="audio" controls></audio>
<script>
var socket = io.connect('http://' + document.domain + ':' + location.port);
var audio = document.getElementById('audio');
var context = new AudioContext();
var source = null;
var node = null;
socket.on('audio', function(data) {
var arrayBuffer = data.buffer;
context.decodeAudioData(arrayBuffer, function(buffer) {
source = context.createBufferSource();
source.buffer = buffer;
if (node === null) {
node = context.createScriptProcessor(4096, 2, 2);
node.onaudioprocess = function(audioProcessingEvent) {
var inputBuffer = audioProcessingEvent.inputBuffer;
var outputBuffer = audioProcessingEvent.outputBuffer;
for (var channel = 0; channel < outputBuffer.numberOfChannels; channel++) {
var inputData = inputBuffer.getChannelData(channel);
var outputData = outputBuffer.getChannelData(channel);
for (var sample = 0; sample < inputBuffer.length; sample++) {
outputData[sample] = inputData[sample];
}
}
socket.emit('audio', {
buffer: outputBuffer.getChannelData(0).buffer
});
};
}
source.connect(node);
node.connect(context.destination);
source.start(0);
});
});
navigator.mediaDevices.getUserMedia({ audio: true }).then(function(stream) {
var mediaStreamSource = context.createMediaStreamSource(stream);
mediaStreamSource.connect(node);
});
</script>
</body>
</html>
```
前端代码中,我们使用了`getUserMedia`方法获取用户的音频流,然后通过WebSocket将音频流发送到后端。后端接收到音频流后,将其广播给所有连接的客户端。客户端通过`decodeAudioData`方法将接收到的音频流转换成`AudioBuffer`,然后创建一个`AudioBufferSourceNode`和一个`ScriptProcessorNode`,将音频数据源连接到`ScriptProcessorNode`,并将`ScriptProcessorNode`连接到音频输出设备。`ScriptProcessorNode`的`onaudioprocess`回调函数中,我们读取输入音频数据并将其发送到后端,以实现实时音频流传输。
请注意,这只是一个简单的实现,如果需要更高质量的音频流传输,您可能需要进行更复杂的编码和解码。
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