[FFmpeg-devel] [PATCH V4] avfilter/vf_bilateral: process command to set the parameter at runtime

[Tao Zhang]

ping, at the beginning of the new week:)

leozhang <leozhang at qiyi.com> 于2019年11月3日周日 下午6:50写道：

>
> Reviewed-by: Paul B Mahol <onemda at gmail.com>
> Reviewed-by: Jun Zhao <mypopy at gmail.com>
> Signed-off-by: leozhang <leozhang at qiyi.com>
> ---
>  libavfilter/vf_bilateral.c | 39 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/libavfilter/vf_bilateral.c b/libavfilter/vf_bilateral.c
> index 3c9d800..ba3631c 100644
> --- a/libavfilter/vf_bilateral.c
> +++ b/libavfilter/vf_bilateral.c
> @@ -29,6 +29,8 @@
>  #include "internal.h"
>  #include "video.h"
>
> +#include <float.h>
> +
>  typedef struct BilateralContext {
>      const AVClass *class;
>
> @@ -54,7 +56,7 @@ typedef struct BilateralContext {
>  } BilateralContext;
>
>  #define OFFSET(x) offsetof(BilateralContext, x)
> -#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
> +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
>
>  static const AVOption bilateral_options[] = {
>      { "sigmaS", "set spatial sigma",    OFFSET(sigmaS), AV_OPT_TYPE_FLOAT, {.dbl=0.1}, 0.0,  10, FLAGS },
> @@ -91,19 +93,27 @@ static int query_formats(AVFilterContext *ctx)
>      return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
>  }
>
> -static int config_input(AVFilterLink *inlink)
> +static int init_lut(BilateralContext *s)
>  {
> -    BilateralContext *s = inlink->dst->priv;
> -    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
>      float inv_sigma_range;
>
> -    s->depth = desc->comp[0].depth;
>      inv_sigma_range = 1.0f / (s->sigmaR * ((1 << s->depth) - 1));
>
>      //compute a lookup table
>      for (int i = 0; i < (1 << s->depth); i++)
>          s->range_table[i] = expf(-i * inv_sigma_range);
>
> +    return 0;
> +}
> +
> +static int config_input(AVFilterLink *inlink)
> +{
> +    BilateralContext *s = inlink->dst->priv;
> +    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
> +
> +    s->depth = desc->comp[0].depth;
> +    init_lut(s);
> +
>      s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
>      s->planewidth[0] = s->planewidth[3] = inlink->w;
>      s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
> @@ -325,6 +335,24 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
>      return ff_filter_frame(outlink, out);
>  }
>
> +static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
> +                           char *res, int res_len, int flags)
> +{
> +    BilateralContext *s = ctx->priv;
> +    int ret;
> +    float old_sigmaR = s->sigmaR;
> +
> +    if ((ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags)) < 0) {
> +        return ret;
> +    }
> +
> +    if (fabs(old_sigmaR - s->sigmaR) > FLT_EPSILON && (ret = init_lut(s)) < 0) {
> +        s->sigmaR = old_sigmaR;
> +    }
> +
> +    return ret;
> +}
> +
>  static av_cold void uninit(AVFilterContext *ctx)
>  {
>      BilateralContext *s = ctx->priv;
> @@ -367,4 +395,5 @@ AVFilter ff_vf_bilateral = {
>      .inputs        = bilateral_inputs,
>      .outputs       = bilateral_outputs,
>      .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
> +    .process_command = process_command,
>  };
> --
> 1.8.3.1
>
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