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Old 24th December 2001, 06:26   #1  |  Link
Ocrana
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Bitrate reader for ac3

Hello,

a few months ago I found a little commandline prog to detect the bitrate of an ac3 stream in a vob file. Anyone has an Idea how to make this, cause the sources of this tool are not aviable..

In eed this for a bitrate calculator

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Old 24th December 2001, 10:31   #2  |  Link
DSPguru
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sure.
for each frame in the AC3 stream, there's the frame-size-code in the syncinfo (in BSI).
so, if you assume that all frames in the stream are in the same size, just read the syncinfo of the first frame (first 6 bytes of the file would be the first syncinfo), else, compute avarage of all frame-sizes.

here's the struct :
Code:
struct  syncinfo {
	short	syncword;   
	short	crc1;       
        unsigned short frmsizecod:6;
        unsigned short fscod:2;
        unsigned short bsmod:3; 
	unsigned short bsid:5;  
} ;

Last edited by DSPguru; 24th December 2001 at 10:43.
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