On Thu, Aug 11, 2022 at 10:50:10PM +0200, Andreas Rheinhardt wrote:
> Michael Niedermayer:
> > On Wed, Aug 10, 2022 at 10:47:09PM +0200, Timo Rothenpieler wrote:
> >> ---
> >>  libavcodec/Makefile     |  8 +++---
> >>  libavcodec/exr.c        |  2 +-
> >>  libavcodec/exrenc.c     |  2 +-
> >>  libavcodec/float2half.c | 19 +++++++++++++
> >>  libavcodec/half2float.c | 19 +++++++++++++
> >>  libavcodec/pnmdec.c     |  2 +-
> >>  libavcodec/pnmenc.c     |  2 +-
> >>  libavutil/float2half.c  | 53 ++++++++++++++++++++++++++++++++++
> >>  libavutil/float2half.h  | 36 ++---------------------
> >>  libavutil/half2float.c  | 63 +++++++++++++++++++++++++++++++++++++++++
> >>  libavutil/half2float.h  | 46 ++----------------------------
> >>  11 files changed, 166 insertions(+), 86 deletions(-)
> >>  create mode 100644 libavcodec/float2half.c
> >>  create mode 100644 libavcodec/half2float.c
> >>  create mode 100644 libavutil/float2half.c
> >>  create mode 100644 libavutil/half2float.c
> >>
> >> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> >> index 029f1bad3d..cb80f73d99 100644
> >> --- a/libavcodec/Makefile
> >> +++ b/libavcodec/Makefile
> >> @@ -337,8 +337,8 @@ OBJS-$(CONFIG_EIGHTSVX_FIB_DECODER)    += 8svx.o
> >>  OBJS-$(CONFIG_ESCAPE124_DECODER)       += escape124.o
> >>  OBJS-$(CONFIG_ESCAPE130_DECODER)       += escape130.o
> >>  OBJS-$(CONFIG_EVRC_DECODER)            += evrcdec.o acelp_vectors.o lsp.o
> >> -OBJS-$(CONFIG_EXR_DECODER)             += exr.o exrdsp.o
> >> -OBJS-$(CONFIG_EXR_ENCODER)             += exrenc.o
> >> +OBJS-$(CONFIG_EXR_DECODER)             += exr.o exrdsp.o half2float.o
> >> +OBJS-$(CONFIG_EXR_ENCODER)             += exrenc.o float2half.o
> >>  OBJS-$(CONFIG_FASTAUDIO_DECODER)       += fastaudio.o
> >>  OBJS-$(CONFIG_FFV1_DECODER)            += ffv1dec.o ffv1.o
> >>  OBJS-$(CONFIG_FFV1_ENCODER)            += ffv1enc.o ffv1.o
> >> @@ -570,8 +570,8 @@ OBJS-$(CONFIG_PGMYUV_DECODER)          += pnmdec.o pnm.o
> >>  OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnmenc.o
> >>  OBJS-$(CONFIG_PGSSUB_DECODER)          += pgssubdec.o
> >>  OBJS-$(CONFIG_PGX_DECODER)             += pgxdec.o
> >> -OBJS-$(CONFIG_PHM_DECODER)             += pnmdec.o pnm.o
> >> -OBJS-$(CONFIG_PHM_ENCODER)             += pnmenc.o
> >> +OBJS-$(CONFIG_PHM_DECODER)             += pnmdec.o pnm.o half2float.o
> >> +OBJS-$(CONFIG_PHM_ENCODER)             += pnmenc.o float2half.o
> >>  OBJS-$(CONFIG_PHOTOCD_DECODER)         += photocd.o
> >>  OBJS-$(CONFIG_PICTOR_DECODER)          += pictordec.o cga_data.o
> >>  OBJS-$(CONFIG_PIXLET_DECODER)          += pixlet.o
> >> diff --git a/libavcodec/exr.c b/libavcodec/exr.c
> >> index 825354873d..a3582bfdd6 100644
> >> --- a/libavcodec/exr.c
> >> +++ b/libavcodec/exr.c
> >> @@ -2208,7 +2208,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
> >>      float one_gamma = 1.0f / s->gamma;
> >>      avpriv_trc_function trc_func = NULL;
> >>  
> >> -    init_half2float_tables(&s->h2f_tables);
> >> +    ff_init_half2float_tables(&s->h2f_tables);
> > [...]
> >> diff --git a/libavutil/float2half.c b/libavutil/float2half.c
> >> new file mode 100644
> >> index 0000000000..dba14cef5d
> >> --- /dev/null
> >> +++ b/libavutil/float2half.c
> > [...]
> >> +void ff_init_float2half_tables(float2half_tables *t)
> > 
> > this will need avpriv or break linking with shared libs
> > 
> 
> No, because this code is duplicated into all libraries that need it.
> (In case of static linking, only one of the variants will be used
> (namely the first one encountered in the link.)

libswscale/libswscale.so: undefined reference to `ff_init_half2float_tables'
libswscale/libswscale.so: undefined reference to `ff_init_half2float_tables'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Makefile:131: recipe for target 'ffplay_g' failed
make: *** [ffplay_g] Error 1
make: *** Waiting for unfinished jobs....
clang: error: linker command failed with exit code 1 (use -v to see invocation)
libswscale/libswscale.so: undefined reference to `ff_init_half2float_tables'
Makefile:131: recipe for target 'ffprobe_g' failed
make: *** [ffprobe_g] Error 1
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Makefile:131: recipe for target 'ffmpeg_g' failed
make: *** [ffmpeg_g] Error 1


[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Dictatorship naturally arises out of democracy, and the most aggravated
form of tyranny and slavery out of the most extreme liberty. -- Plato