[FFmpeg-devel] [PATCH] Add negate filter.

Michael Niedermayer michaelni
Sun Nov 28 03:09:35 CET 2010


On Fri, Nov 26, 2010 at 05:32:13PM +0100, Stefano Sabatini wrote:
> Ported from the libavfilter-soc repo with some cosmetical change.
> ---
>  doc/filters.texi         |    4 ++
>  libavfilter/Makefile     |    1 +
>  libavfilter/allfilters.c |    1 +
>  libavfilter/vf_negate.c  |  135 ++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 141 insertions(+), 0 deletions(-)
>  create mode 100644 libavfilter/vf_negate.c
> 
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 1cba2d6..037ad78 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -360,6 +360,10 @@ The following command:
>  will make libavfilter use a format different from "yuv420p" for the
>  input to the vflip filter.
>  
> + at section negate
> +
> +Convert a video to its negative.
> +
>  @section null
>  
>  Pass the video source unchanged to the output.
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 210510f..4379e9a 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -27,6 +27,7 @@ OBJS-$(CONFIG_FIFO_FILTER)                   += vf_fifo.o
>  OBJS-$(CONFIG_FORMAT_FILTER)                 += vf_format.o
>  OBJS-$(CONFIG_FREI0R_FILTER)                 += vf_frei0r.o
>  OBJS-$(CONFIG_HFLIP_FILTER)                  += vf_hflip.o
> +OBJS-$(CONFIG_NEGATE_FILTER)                 += vf_negate.o
>  OBJS-$(CONFIG_NOFORMAT_FILTER)               += vf_format.o
>  OBJS-$(CONFIG_NULL_FILTER)                   += vf_null.o
>  OBJS-$(CONFIG_OCV_SMOOTH_FILTER)             += vf_libopencv.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 9e3ba14..1a776ca 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -48,6 +48,7 @@ void avfilter_register_all(void)
>      REGISTER_FILTER (FORMAT,      format,      vf);
>      REGISTER_FILTER (FREI0R,      frei0r,      vf);
>      REGISTER_FILTER (HFLIP,       hflip,       vf);
> +    REGISTER_FILTER (NEGATE,      negate,      vf);
>      REGISTER_FILTER (NOFORMAT,    noformat,    vf);
>      REGISTER_FILTER (NULL,        null,        vf);
>      REGISTER_FILTER (OCV_SMOOTH,  ocv_smooth,  vf);
> diff --git a/libavfilter/vf_negate.c b/libavfilter/vf_negate.c
> new file mode 100644
> index 0000000..d3c388e
> --- /dev/null
> +++ b/libavfilter/vf_negate.c
> @@ -0,0 +1,135 @@
> +/*
> + * Copyright (c) 2007 Bobby Bingham
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +/**
> + * @file
> + * video negative filter
> + */
> +
> +#include "libavutil/pixdesc.h"
> +#include "avfilter.h"
> +
> +typedef struct {
> +    int off_y, off_uv;
> +    int hsub, vsub;
> +} NegContext;
> +
> +static int query_formats(AVFilterContext *ctx)
> +{
> +    enum PixelFormat pix_fmts[] = {
> +        PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
> +        PIX_FMT_YUV411P,  PIX_FMT_YUV410P,
> +        PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
> +        PIX_FMT_YUV440P,  PIX_FMT_YUVJ440P,
> +        PIX_FMT_MONOWHITE, PIX_FMT_MONOBLACK,
> +        PIX_FMT_NONE
> +    };
> +
> +    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
> +    return 0;
> +}
> +
> +static int config_props(AVFilterLink *inlink)
> +{
> +    NegContext *neg = inlink->dst->priv;
> +
> +    neg->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
> +    neg->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
> +
> +    switch (inlink->format) {
> +    case PIX_FMT_YUVJ444P:
> +    case PIX_FMT_YUVJ422P:
> +    case PIX_FMT_YUVJ420P:
> +    case PIX_FMT_YUVJ440P:
> +        neg->off_y  =
> +        neg->off_uv = 0;
> +        break;
> +    default:
> +        neg->off_y  = -4;
> +        neg->off_uv = 1;
> +    }
> +
> +    return 0;
> +}
> +
> +static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
> +{
> +    NegContext *neg = inlink->dst->priv;
> +    AVFilterLink *outlink = inlink->dst->outputs[0];
> +    AVFilterBufferRef *inpic  = inlink ->cur_buf;
> +    AVFilterBufferRef *outpic = outlink->out_buf;
> +    uint8_t *inrow, *outrow;
> +    int i, j, plane;
> +
> +    if (inlink->format == PIX_FMT_MONOWHITE || inlink->format == PIX_FMT_MONOBLACK) {
> +        inrow  = inpic ->data[0] + y * inpic ->linesize[0];
> +        outrow = outpic->data[0] + y * outpic->linesize[0];
> +        for (i = 0; i < h; i++) {
> +            for (j = 0; j < inlink->w >> 3; j++)
> +                outrow[j] = ~inrow[j];
> +            inrow  += inpic ->linesize[0];
> +            outrow += outpic->linesize[0];
> +        }
> +    } else {
> +        /* luma plane */
> +        inrow  = inpic ->data[0] + y * inpic-> linesize[0];
> +        outrow = outpic->data[0] + y * outpic->linesize[0];
> +        for (i = 0; i < h; i ++) {
> +            for(j = 0; j < inlink->w; j++)
> +                outrow[j] = 255 - inrow[j] + neg->off_y;
> +            inrow  += inpic ->linesize[0];
> +            outrow += outpic->linesize[0];
> +        }
> +
> +        /* chroma planes */
> +        for (plane = 1; plane < 3; plane++) {
> +            inrow  = inpic-> data[plane] + (y >> neg->vsub) * inpic ->linesize[plane];
> +            outrow = outpic->data[plane] + (y >> neg->vsub) * outpic->linesize[plane];
> +
> +            for (i = 0; i < h >> neg->vsub; i++) {
> +                for (j = 0; j < inlink->w >> neg->hsub; j++)
> +                    outrow[j] = 255 - inrow[j] + neg->off_uv;
> +                inrow  += inpic ->linesize[plane];
> +                outrow += outpic->linesize[plane];
> +            }
> +        }

the user should be able to selct which planes are negated

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No human being will ever know the Truth, for even if they happen to say it
by chance, they would not even known they had done so. -- Xenophanes
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