Mime-type of Android camera PreviewFormat

问题:

I'd like to use MediaCodec to encode the data coming from the camera (reason: it's more low-level so hopefully faster than using MediaRecorder). Using Camera.PreviewCallBack, I capture the data from the camera into a byte-buffer, in order to pass it on to a MediaCodec object.

To do this, I need to fill in a MediaFormat-object, which would be fairly easy if I knew the MIME-code of the data coming from the camera. I can pick this format using setPreviewFormat() choosing one of the constants declared in te ImageFormat-class.

Hence my question: given the different options provided by the ImageFormat-class to set the camera preview-format, what are the corresponding MIME-type codes?

Thanks a lot in advance.

回答1:

See example at https://gist.github.com/3990442. You should set MIME type of what you want to get out of encoder, i.e. "video/avc".