Recording PCM audio in silverlight 4

问题

I have encountered a strange behavior in Silverlight application and couldn't be able to resolve it after trying many hours.

• Since I cannot access AudioFormat's internal constructor in my code (even using reflection caused silverlight security policies to raise an exception), How can I change audio format (in my class which is derived from AudioSink class. Right now, I override the method in my MemoryAudioSink class as follows:

  protected override void OnFormatChange(AudioFormat audioFormat)
  {
      if (this.audioFormat == null)
      {
          this.audioFormat = audioFormat;
      }
      else
      {
          throw new InvalidOperationException();
      }
  }  
  

  I cannot create new AudioFormat (no ctor available) and the default AudioFomat has 16000 samples per seconds which has no setter. I'd like to record and save audio, in a Mono (Channels = 1), 8 bit(Bits Per Sample = 8), 8k (Samples Per Second = 8000) format.

Also, I have used Cool Edit to record 8bit 8k audio successfully to make sure my sound card supports it.

So simply put, Can I record audio with my custom AudioFormat or should I record the audio in Silverlight, pass it to my WebApp, and convert it to my custom format using a third party library (which I'm not aware of any)?

回答1:

This link might help you: Silverlight 4 audio recording and upload to server Sry for my stupidity I dont know how to format code, in that link I gave you, look for line AudioFormat desiredAudioFormat = null; go there, you need next foreach

来源：https://stackoverflow.com/questions/7175217/recording-pcm-audio-in-silverlight-4