[Ffmpeg-devel] surround sound handling

Benjamin Larsson banan
Fri Aug 18 20:10:35 CEST 2006


Stefan Heinzmann wrote:

>Hi all,
>I was trying to find out whether there was a standardised way
>of handling surround sound in libavcodec, but I wasn't very
There is none afaik.

> Apart from the number of audio channels which is
>readily available, is there any non-codec-specific way to
>find out about the channel mapping on a decoded signal, and
>also the downmix rules for the material? I'm asking because
>for example AC-3 provides several different possibilities for
>both and I can't figure out how to access this information
>without going into examining private data specific for the
>Can anyone providee some insight, or point me to the places
>where I need to look?
I guess you need to look into private codec data. The audio api needs to
be reworked for features like that.

Benjamin Larsson

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