[FFmpeg-devel] Use ffmpeg as an Android stagefright plugin

Michael Niedermayer michaelni at gmx.at
Tue Aug 20 21:53:55 CEST 2013

On Tue, Aug 20, 2013 at 11:51:51AM +0800, Chih-Wei Huang wrote:
> Michael Niedermayer said:
> > Is it possible to merge it in the ffmpeg upstream?
> i see lots of hardcoded config.mak/h files
> > Consider that new options could be added to configure and would then
> > be missing from this, also a user might want to build with different
> > codecs / (de)muxers than the ones hardcoded in these files
> That's right.
> This is the easier way to create a compatible
> makefile for android build system.
> Considering the target (android) is well-known,
> there is no real benefit to configure codecs/(de)muxers
> dynamically.

it can make sense to disable code that is very rarely used to reduce
the size of the resulting binary.

> I also considered to generate the android config.*
> from configure script on the fly.
> However, the output config.mak of configure is not friendly
> to android build system. It exports some variables
> like CC, CFLAGS that will conflict with
> the android build system.
> (Note Android doesn't use sub-make --
> all sub-makefiles are included in from the main makefile
> and all vars in sub-makefiles are exported)
> If you can modify the output of configure, say,
> splitting it into two files to let ARCH_*,
> HAVE_*, CONFIG_* vars in one file and
> others in another file, that would be more
> friendly to android build system.
> Then I could generate the android config.* on the fly.

You should be able to change CFLAGS / CC in the "# OS specific"
section of configure if they have incorrect values

configure is using the set cc/cflags to test various things like
compiler features so they should be set correctly.

But if i misunderstand and theres a real need to omit fields from
the config files that can be done as well or they could be placed
under ifdef

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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