目的
- 更改实时流的增益(麦克风音量)。
- 在演示中,您将能够从低增益 (0.1) 更改为高增益 (1)。当它设置为 0.1 时,您几乎不会听到自己的声音,就像耳语模式一样。
问题
下面的代码适用于 Windows、Android 和 Safari 桌面版本,但是当我尝试在我的 iPhone SE 上的 Safari 中运行它时,我没有听到耳语或低增益。我检查了增益节点的值,单击按钮时它设置为0.1,但似乎没有生效。
演示链接:
https://unrupt.github.io/webrtc-samples/stream-gain-control.html
iPhone 上 Safari 媒体支持的约束
- 纵横比
- 设备ID
- 回声消除
- 面对模式
- 帧率
- 组 ID
- 高度
- 相同速率
- 样本大小
- 体积
- 宽度
代码:
<h2 class="w3-center">Media Stream with Gain Control</h2>
<p class="w3-center">The aim of this sample is to control the gain of the stream</p>
<audio id="audio" playsinline="true" controls autoplay></audio><br>
<button class="btn-fn" onclick="start()">Start!</button>
<button class="btn-fn" onclick="updateGain(0.001)">Low Gain</button>
<button class="btn-fn" onclick="updateGain(1)">Default Gain</button>
<script>
var AudioContext = window.AudioContext || window.webkitAudioContext;
var localStream;
var gainNode;
var ctx;
var dst;
var start = () => navigator.mediaDevices.getUserMedia({audio: true})
.then(stream => audio.srcObject = modifyGain(stream, 2.5))
.catch(e => log(e));
var modifyGain = (stream, gainValue) => {
localStream = stream;
ctx = new AudioContext();
var src = ctx.createMediaStreamSource(stream);
dst = ctx.createMediaStreamDestination();
gainNode = ctx.createGain();
gainNode.gain.value = gainValue;
src.connect(gainNode);
gainNode.connect(dst);
outputStream = dst.stream;
stream.addTrack(outputStream.getAudioTracks()[0]);
stream.removeTrack(stream.getAudioTracks()[0]);
//[src, gainNode, dst].reduce((a, b) => a && a.connect(b));
return stream;
};
var updateGain = (value) => {
gainNode.gain.value = value;
};
var log = msg => div.innerHTML += "<br>" + msg;
</script>
有什么建议可以尝试吗?