On Wednesday, July 30, 2003, at 04:56 PM, Shiming Dong wrote:

I have one question: I was supposed to implement a program to detect a specific marker tone. But my problem is how to know the frequency of each frame?

You can look at the subband samples in frame.sbsample (before/without synthesis, which is not required) to perhaps evaluate the presence of your marker tone.

See this thread to get an idea how the subband samples relate to frequency:

http://www.mars.org/mailman/public/mad-dev/2003-July/000860.html http://www.mars.org/mailman/public/mad-dev/2003-July/000869.html