[MPlayer-dev-eng] pl_surround - Dolby Surround decoder - committed

[Stephen Davies]

Hi,

I've committed this new plugin.  Only update from yesterday's notes is
that the command-line option to use it is now '-aop list=surround' due to
Anders' changes in the option parsing for audio plugins.

I've set up the plugin so that if the input audio already has >2 channels
the plugin becomes "do nothing".  So those with >2 channel audio cards can
use "-channels 4 -aop list=surround" for any file; ac3 files we get
multichannel via the ac3 decoder, other files will get surround decoding
via the surround plugin.

Please let me know how it works for you.

Steve



---------- Forwarded message ----------
Date: Mon, 3 Dec 2001 14:00:30 +0000 (GMT)
From: Stephen Davies <steve at daviesfam.org>
To: mplayer-dev-eng at mplayer.dev.hu
Subject: pl_surround - Dolby Surround decoder - OK to commit?

Hi,

I've written an audio plugin to do surround decoding.  It will decode
stereo pairs containing matrixed surround sound - eg Dolby Surround, Dolby
ProLogic and ProLogic II compatible files.

This implements a basic Surround decoder, without the low pass filter for
the rear channels.  I plan to extend it to make it more Pro
Logic-like.  But it seems to work quite well as it is.

Many video files have sound in this format; its also used in TV
broadcasts.

Even ordinary stereo pairs usually produce a listenable surround effect.

The effect is enabled using "-aop surround".  Output is 4-channel; you'll
need a card that supports that, and that is correctly setup - see my notes
in codecs.html or to the list about the SBLive, for instance.

I'll commit the code later today unless there are any objections?

Once its in I'd be pleased to have some feedback,

Steve