[FFmpeg-devel] [PATCH 3/3] avfilter/x86/vf_eq: add SSE2 version

[James Almer]

On 9/17/2019 10:39 AM, Ting Fu wrote:
> Signed-off-by: Ting Fu <ting.fu at intel.com>
> ---
>  libavfilter/x86/vf_eq.asm    | 19 +++++++++++++++++--
>  libavfilter/x86/vf_eq_init.c | 20 ++++++++++++++++++++
>  2 files changed, 37 insertions(+), 2 deletions(-)
> 
> diff --git a/libavfilter/x86/vf_eq.asm b/libavfilter/x86/vf_eq.asm
> index bf28691297..d6b51cf6df 100644
> --- a/libavfilter/x86/vf_eq.asm
> +++ b/libavfilter/x86/vf_eq.asm
> @@ -24,14 +24,21 @@
>  
>  SECTION .text
>  
> -INIT_MMX mmx
> +%macro PROCESS_ONE_LINE 1
>  cglobal process_one_line, 5, 7, 5, src, dst, contrast, brightness, w
>      movd m3, contrastd
>      movd m4, brightnessd
>      movsx r5d, contrastw
>      movsx r6d, brightnessw
> +%if mmsize == 8
>      pshufw m3, m3, 0
>      pshufw m4, m4, 0

pshufw isn't mmx, but mmxext (AKA, integer SSE). Hardly a problem since
i don't think anyone using a Pentium 2 will use this filter, but still
it's technically wrong.

The function should be changed into mmxext to reflect the above.

> +%elif mmsize == 16
> +    pshuflw m3, m3, 0
> +    movlhps m3, m3
> +    pshuflw m4, m4, 0
> +    movlhps m4, m4
> +%endif

You can use the SPLATW macro instead. It will expand to the correct
instructions based on what set is enabled.

>  
>      DEFINE_ARGS src, dst, tmp, scalar, w
>      xor tmpd, tmpd
> @@ -39,7 +46,7 @@ cglobal process_one_line, 5, 7, 5, src, dst, contrast, brightness, w
>      pxor m1, m1
>      mov scalard, wd
>      and scalard, mmsize-1
> -    sar wd, 3
> +    sar wd, %1
>      cmp wd, 1
>      jl .loop1
>  
> @@ -80,3 +87,11 @@ cglobal process_one_line, 5, 7, 5, src, dst, contrast, brightness, w
>  
>      .end:
>          RET
> +
> +%endmacro
> +
> +INIT_MMX mmx
> +PROCESS_ONE_LINE 3
> +
> +INIT_XMM sse2
> +PROCESS_ONE_LINE 4
> diff --git a/libavfilter/x86/vf_eq_init.c b/libavfilter/x86/vf_eq_init.c
> index 63c69078fb..cdd5272220 100644
> --- a/libavfilter/x86/vf_eq_init.c
> +++ b/libavfilter/x86/vf_eq_init.c
> @@ -28,6 +28,8 @@
>  
>  extern void ff_process_one_line_mmx(const uint8_t *src, uint8_t *dst, int contvec,
>                                      int brvec, int w);
> +extern void ff_process_one_line_sse2(const uint8_t *src, uint8_t *dst, int contvec,
> +                                    int brvec, int w);
>  
>  static void process_mmx(EQParameters *param, uint8_t *dst, int dst_stride,
>                          const uint8_t *src, int src_stride, int w, int h)
> @@ -44,6 +46,21 @@ static void process_mmx(EQParameters *param, uint8_t *dst, int dst_stride,
>      emms_c();
>  }
>  
> +static void process_sse2(EQParameters *param, uint8_t *dst, int dst_stride,
> +                        const uint8_t *src, int src_stride, int w, int h)
> +{
> +    short contrast = (short) (param->contrast * 256 * 16);
> +    short brightness = ((short) (100.0 * param->brightness + 100.0) * 511)
> +                       / 200 - 128 - contrast / 32;
> +
> +    while (h--) {
> +        ff_process_one_line_sse2(src, dst, contrast, brightness, w);
> +        src += src_stride;
> +        dst += dst_stride;
> +    }
> +    emms_c();

No need for this since the SSE2 version uses xmm regs.

> +}
> +
>  av_cold void ff_eq_init_x86(EQContext *eq)
>  {
>      int cpu_flags = av_get_cpu_flags();
> @@ -51,5 +68,8 @@ av_cold void ff_eq_init_x86(EQContext *eq)
>      if (cpu_flags & AV_CPU_FLAG_MMX) {
>          eq->process = process_mmx;
>      }
> +    if (cpu_flags & AV_CPU_FLAG_SSE2) {
> +        eq->process = process_sse2;
> +    }
>  }
>  
>