[FFmpeg-devel] [WIP] libsox wrapper

[Stefano Sabatini]

On date Sunday 2013-03-31 18:22:13 +0200, Stefano Sabatini encoded:
> On date Thursday 2013-03-21 21:15:07 +0100, Stefano Sabatini encoded:
> [...]
> Updated, this time with a correct subject line, and hopefully working
> drain.
> 
> Try it with:
> ffplay -f lavfi "flite=text=hey, sox=echo 0.8 0.7 1000 0.5 2000 0.3"
> 
> Still missing:
> - proper configuration of effects
> - proper multi-channel support
> - thread-safe init
> -- 
> FFmpeg = Fanciful Fierce Miracolous Ponderous Esoteric Gangster

> From 519a5ad62b9dfa44c164a686261a8c6f141775bf Mon Sep 17 00:00:00 2001
> From: Stefano Sabatini <stefasab at gmail.com>
> Date: Mon, 22 Aug 2011 14:37:42 +0200
> Subject: [PATCH] lavfi: add libsox wrapper
> 
> Still incomplete.
> 
> Based on a patch by Mina Nagy Zaki <mnzaki at gmail.com>.
> ---
>  configure                |    4 +
>  doc/filters.texi         |   37 ++++
>  libavfilter/Makefile     |    1 +
>  libavfilter/af_sox.c     |  428 ++++++++++++++++++++++++++++++++++++++++++++++
>  libavfilter/allfilters.c |    1 +
>  5 files changed, 471 insertions(+)
>  create mode 100644 libavfilter/af_sox.c

Updated WIP, not yet working properly with multichannel support, for
example:
ffplay -f lavfi "anullsrc=r=22100:cl=quad,sox=synth sin %-12 sin %-9 sin %-5 sin %-2"
ffplay -f lavfi aevalsrc="-0.4:0.4" -af "sox=earwax"

still have problems, and I still have various crashes with various
effects.

As for what regards thread init, I wonder if we need to use a mutex or
atomic.h should be enough.

Finally, regarding configuration, I'm assuming all the filters to
accepts whatever format, and that this is the same for input and
output. This works for most filters, but not for a few (e.g. mixer,
rate, which sets the output depending on the input - and which are
difficult to integrate in our query_formats() mechanism).
-- 
FFmpeg = Fundamentalist and Fiendish Mean Practical Emblematic Guide
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