[FFmpeg-devel] [PATCH] Refactor OBJS handling in libavcodec/Makefile
Diego Biurrun
diego
Thu Jul 9 12:44:30 CEST 2009
On Thu, Jul 09, 2009 at 11:15:17AM +0100, M?ns Rullg?rd wrote:
> Diego Biurrun <diego at biurrun.de> writes:
>
> > On Thu, Jul 09, 2009 at 01:18:13AM +0100, M?ns Rullg?rd wrote:
> >> Diego Biurrun <diego at biurrun.de> writes:
> >>
> >> > We currently duplicate a lot in the OBJS lines in libavcodec/Makefile.
> >> > Here is an attempt to refactor this somewhat by grouping common OBJS
> >> > into variables.
> >> >
> >> > I'm sure this could be improved further. Currently the grouping is
> >> > somewhat arbitrary. Better suggestions are welcome.
> >> >
> >> > --- libavcodec/Makefile (revision 19378)
> >> > +++ libavcodec/Makefile (working copy)
> >> > @@ -5,6 +5,16 @@
> >> >
> >> > +MPEG_OBJS = motion_est.o ratecontrol.o mpeg12data.o mpegvideo.o
> >> > +MPEG_DEC_OBJS = mpeg12data.o mpegvideo.o error_resilience.o
> >> > +MPEG_ENC_OBJS = mpegvideo_enc.o $(MPEG_OBJS)
> >> > +MPEG_ENC_ERROR_OBJS = error_resilience.o $(MPEG_ENC_OBJS)
> >> > +
> >> > +H263_OBJS = h263.o $(MPEG_DEC_OBJS)
> >> > +H264_OBJS = h264idct.o h264pred.o cabac.o mpegvideo.o error_resilience.o
> >> > +VC1_OBJS = vc1.o vc1data.o msmpeg4data.o h263dec.o h263.o intrax8.o error_resilience.o mpegvideo.o msmpeg4.o
> >> > +VC1_DSP_OBJS = vc1dsp.o intrax8dsp.o $(VC1_OBJS)
> >>
> >> How did you arrive at this list? Did you analyse inter-object
> >> dependencies or just guess?
> >
> > I looked at places where long lists of OBJS where duplicated and
> > eliminated those.
>
> That's not good enough.
What is the shortcoming of my approch and what is your alternative
suggestion?
> > Notice that an alternative would be to have some decoders depend on
> > others. For example, the vc1_vdpau decoder could be made to depend on
> > the vc1 decoder in configure. Then it would not need to duplicate the
> > OBJS list. However, this is not currently possible in configure.
>
> Why not? Is vc1_vdpau_decoder_deps=vc1_decoder not enough?
No, if you run
configure --disable-decoders --enable-decoder=vc1_vdpau
no decoders are enabled.
Diego
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