[FFmpeg-devel] [PATCH] lavfi: add deinterleave filters

[Clément Bœsch]

On Mon, Jan 05, 2015 at 04:33:44PM +0000, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
>  libavfilter/Makefile         |   2 +
>  libavfilter/allfilters.c     |   2 +
>  libavfilter/f_deinterleave.c | 143 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 147 insertions(+)
>  create mode 100644 libavfilter/f_deinterleave.c
> 
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 0ead6c5..17e49ee 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -29,6 +29,7 @@ OBJS = allfilters.o                                                     \
>  
>  OBJS-$(CONFIG_AVCODEC)                       += avcodec.o
>  
> +OBJS-$(CONFIG_ADEINTERLEAVE_FILTER)          += f_deinterleave.o
>  OBJS-$(CONFIG_ADELAY_FILTER)                 += af_adelay.o
>  OBJS-$(CONFIG_AECHO_FILTER)                  += af_aecho.o
>  OBJS-$(CONFIG_AEVAL_FILTER)                  += aeval.o
> @@ -108,6 +109,7 @@ OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
>  OBJS-$(CONFIG_CURVES_FILTER)                 += vf_curves.o
>  OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
>  OBJS-$(CONFIG_DECIMATE_FILTER)               += vf_decimate.o
> +OBJS-$(CONFIG_DEINTERLEAVE_FILTER)           += f_deinterleave.o
>  OBJS-$(CONFIG_DEJUDDER_FILTER)               += vf_dejudder.o
>  OBJS-$(CONFIG_DELOGO_FILTER)                 += vf_delogo.o
>  OBJS-$(CONFIG_DESHAKE_FILTER)                += vf_deshake.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 6543629..66982f5 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -50,6 +50,7 @@ void avfilter_register_all(void)
>      REGISTER_FILTER(AEVAL,          aeval,          af);
>      REGISTER_FILTER(AFADE,          afade,          af);
>      REGISTER_FILTER(AFORMAT,        aformat,        af);
> +    REGISTER_FILTER(ADEINTERLEAVE,  adeinterleave,  af);
>      REGISTER_FILTER(AINTERLEAVE,    ainterleave,    af);
>      REGISTER_FILTER(ALLPASS,        allpass,        af);
>      REGISTER_FILTER(AMERGE,         amerge,         af);
> @@ -124,6 +125,7 @@ void avfilter_register_all(void)
>      REGISTER_FILTER(CURVES,         curves,         vf);
>      REGISTER_FILTER(DCTDNOIZ,       dctdnoiz,       vf);
>      REGISTER_FILTER(DECIMATE,       decimate,       vf);
> +    REGISTER_FILTER(DEINTERLEAVE,   deinterleave,   vf);
>      REGISTER_FILTER(DEJUDDER,       dejudder,       vf);
>      REGISTER_FILTER(DELOGO,         delogo,         vf);
>      REGISTER_FILTER(DESHAKE,        deshake,        vf);
> diff --git a/libavfilter/f_deinterleave.c b/libavfilter/f_deinterleave.c
> new file mode 100644
> index 0000000..2209390
> --- /dev/null
> +++ b/libavfilter/f_deinterleave.c
> @@ -0,0 +1,143 @@
> +/*
> + * Copyright (c) 2015 Paul B Mahol
> + *
> + * 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
> + * audio and video de-interleaver
> + */
> +
> +#include "libavutil/opt.h"
> +#include "avfilter.h"
> +#include "formats.h"
> +#include "internal.h"
> +#include "audio.h"
> +#include "video.h"
> +
> +typedef struct {
> +    const AVClass *class;
> +    int nb_outputs;
> +    int index;
> +} DeinterleaveContext;
> +
> +#define OFFSET(x) offsetof(DeinterleaveContext, x)
> +
> +#define DEFINE_OPTIONS(filt_name, flags_)                           \
> +static const AVOption filt_name##_options[] = {                     \
> +   { "nb_outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, .flags = flags_ }, \
> +   { NULL }                                                         \
> +}
> +
> +static av_cold int deinterleave_init(AVFilterContext *ctx)
> +{
> +    DeinterleaveContext *s = ctx->priv;
> +    int i;
> +
> +    for (i = 0; i < s->nb_outputs; i++) {
> +        char name[32];
> +        AVFilterPad pad = { 0 };
> +
> +        snprintf(name, sizeof(name), "output%d", i);
> +        pad.type = ctx->filter->inputs[0].type;
> +        pad.name = av_strdup(name);

if (!pad.name)
    return AVERROR(ENOMEM);

> +
> +        ff_insert_outpad(ctx, i, &pad);
> +    }
> +
> +    return 0;
> +}
> +
> +static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
> +{
> +    AVFilterContext *ctx = inlink->dst;
> +    DeinterleaveContext *s = ctx->priv;

> +    int ret;
> +
> +    ret = ff_filter_frame(ctx->outputs[s->index], frame);
> +
> +    s->index++;
> +    if (s->index >= s->nb_outputs)
> +        s->index = 0;
> +
> +    return ret;

return ff_filter_frame(ctx->outputs[inlink->frame_count % s->nb_outputs], frame);

[...]

-- 
Clément B.
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