Silverlight Mac 麦克风音量
我有一个 SL4 应用程序，它（除其他外）可以从用户的麦克风捕获音频并播放它。它在 PC 上运行得相当好，但我在让它在我们的测试 Macintosh 上正常运行时遇到了很多麻烦。一方面，它似乎忽略了 AudioCaptureDevice.AudioFrameSize：我将其设置为 20 毫秒，这意味着以每秒 16000 个样本的速度，它应该每秒返回 640 字节 50 次。相反，我的 AudioSink.OnSamples() 始终使用 1024 字节数组调用 32 次/秒。奇怪且烦人，但我可以纠正这一点。
更大的问题是我捕获的音频非常非常安静。当我在 PC 上捕获音频并点击作为音频源的网络摄像头时，我会获得 +/- 10,000 范围内的样本。然而，当我在测试 Macintosh 上捕获音频并点击网络摄像头时，我得到的样本在 +/- 100 范围内。如果我在 Mac 的网络摄像头麦克风上录制任何内容然后回放，我实际上根本听不到任何声音。 （我使用的是 MS Lifecam HD-5000，如果这有什么区别的话。）
我知道网络摄像头的麦克风正在工作，因为它与 Skype 配合得很好。
对于解决此问题有什么建议吗？还有其他人遇到类似的问题吗？
I've got an SL4 application that (among other things) captures audio from a user's microphone and plays it back. It all works reasonably well on a PC, but I'm having a lot of trouble getting it to work correctly on our test Macintosh. For one thing, it seems to ignore the AudioCaptureDevice.AudioFrameSize: I've set it to 20 ms, which means that at 16000 samples per second, it should return 640 bytes 50 times per second. Instead, my AudioSink.OnSamples() is consistently called with a 1024 byte array 32 times/second. Odd, and annoying, but I can correct for that.
The bigger problem is that the audio I'm capturing is very, very quiet. When I'm capturing audio on my PC, and I tap on the webcam that's the source of the audio, I get samples in the +/- 10,000 range. However, when I'm capturing audio on my test Macintosh, and I tap on the webcam, I get samples in the +/- 100 range. If I record anything on the Mac's webcam microphone and then play it back, I effectively can't hear anything at all. (I'm using an MS Lifecam HD-5000, if that makes any difference.)
I know that the webcam's microphone is working, as it works just fine with Skype.
Any suggestions for troubleshooting this? Anybody else run into similar issues?
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一般来说，在 Mac 上设置输入音量不太方便:(
我建议切换到 SoundSource 或 MuteMyMic - 两者都允许直接从状态栏调整音量。
In general setting input volume on mac is not quite user friendly :(
I'd suggest switching to SoundSource or MuteMyMic - both allow to adjust volume directly from Status Bar.
事实证明这是一个愚蠢的配置问题，我应该首先检查一下。由于某种原因，OSX 最初将网络摄像头的麦克风设置为“0”（满分 10）。不知道为什么，但当我进入“系统偏好设置”/“声音”/“输入”并调整“输入音量”后，网络摄像头麦克风就开始按照广告宣传的那样工作。
Turned out to be a stupid configuration issue that I should have checked first. For some reason, OSX had initially set the webcam's microphone to "0" out of 10. Not sure why, but as soon as I went to System Preferences / Sound / Input, and adjusted the Input Volume, the webcam microphone started working as advertised.