On Fri, Oct 09, 2015 at 11:53:40PM +0200, Christophe Gisquet wrote:
> Modeled from the prores version. Clips to [0;1023] and is bitexact.
> Bitexactness requires to add an offset in a different place compared
> to prores or C, and makes the function approximately 2% slower.
>
> For 16 frames of a DNxHD 4:2:2 10bits test sequence:
>
> C: 60861 decicycles in idct, 1048205 runs, 371 skips
> sse2: 27567 decicycles in idct, 1048216 runs, 360 skips
> avx: 26272 decicycles in idct, 1048171 runs, 405 skips
> ---
> libavcodec/x86/Makefile | 1 +
> libavcodec/x86/idctdsp_init.c | 16 ++++++++++
> libavcodec/x86/simple_idct.h | 3 ++
> libavcodec/x86/simple_idct10.asm | 53
> +++++++++++++++++++++++++++++++
> libavcodec/x86/simple_idct10_template.asm | 12 +++++++
> 5 files changed, 85 insertions(+)
> create mode 100644 libavcodec/x86/simple_idct10.asm
>
> diff --git a/libavcodec/x86/Makefile b/libavcodec/x86/Makefile
> index a9d8032..ef7628e 100644
> --- a/libavcodec/x86/Makefile
> +++ b/libavcodec/x86/Makefile
> @@ -126,6 +126,7 @@ YASM-OBJS-$(CONFIG_QPELDSP) += x86/qpeldsp.o
> \
> x86/fpel.o \
> x86/qpel.o
> YASM-OBJS-$(CONFIG_RV34DSP) += x86/rv34dsp.o
> +YASM-OBJS-$(CONFIG_IDCTDSP) += x86/simple_idct10.o
> YASM-OBJS-$(CONFIG_VIDEODSP) += x86/videodsp.o
> YASM-OBJS-$(CONFIG_VP3DSP) += x86/vp3dsp.o
> YASM-OBJS-$(CONFIG_VP8DSP) += x86/vp8dsp.o \
> diff --git a/libavcodec/x86/idctdsp_init.c b/libavcodec/x86/idctdsp_init.c
> index 2c26a98..17ddc9e 100644
> --- a/libavcodec/x86/idctdsp_init.c
> +++ b/libavcodec/x86/idctdsp_init.c
> @@ -85,4 +85,20 @@ av_cold void ff_idctdsp_init_x86(IDCTDSPContext *c,
> AVCodecContext *avctx,
> c->put_pixels_clamped = ff_put_pixels_clamped_sse2;
> c->add_pixels_clamped = ff_add_pixels_clamped_sse2;
> }
> +
> + if (ARCH_X86_64 &&
> + avctx->bits_per_raw_sample == 10 && avctx->lowres == 0 &&
> + (avctx->idct_algo == FF_IDCT_AUTO ||
> + avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
> + avctx->idct_algo == FF_IDCT_SIMPLE)) {
> + if (EXTERNAL_SSE2(cpu_flags)) {
> + c->idct_put = ff_simple_idct10_put_sse2;
> + c->perm_type = FF_IDCT_PERM_TRANSPOSE;perm_type represents the permutation for idct_put, idct_add and idct setting just one of them risks having a wrong permutation for the other 2 if some cases are unused they could be set to NULL to avoid hard to debug artifacts if they become used though setting the to a matching idct seems more correct [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB DNS cache poisoning attacks, popular search engine, Google internet authority dont be evil, please
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