[Live-devel] Two questions

[Ross Finlayson]

At 01:17 PM 2/20/04, you wrote:
>Hi,
>I have two questions:
>1. What is the purpose of many table construction in MP3FrameParams's 
>constructor?

The library contains functionality for transcoding MP3 audio from one bit 
rate to another (lower) bitrate.  These tables (which are originally from a 
legacy MP3 decoder implementation) are used to implement this transcoding 
functionality.

>Is it necessary for streaming mpeg audio?

No, but you should probably just leave that code alone.  Note the use of 
the static variable "doneInit" in the "MP3FrameParam" constructor - so 
those tables are only ever initialized once.

>2. In MultiFramedRTPSink::afterGettingFrame1, there is a numTruncatedBytes 
>parameter.However, which function will set this parameter?

It is set in "FramedSource::afterGetting()", from the "fNumTruncatedBytes" 
member variable.  By default, that variable is set to 0 (in 
"FramedSource::getNextFrame()"), but it can also be set by the source's 
"doGetNextFrame()" virtual member function - if truncation actually occurs.


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>