FFmpeg/libavfilter/vf_copy.c

/*
 * 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
 * copy video filter
 */

#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats = NULL;
    int fmt;

    for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
        int ret;
        if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
            continue;
        if ((ret = ff_add_format(&formats, fmt)) < 0)
            return ret;
    }

    return ff_set_common_formats(ctx, formats);
}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterLink *outlink = inlink->dst->outputs[0];
    AVFrame *out = ff_get_video_buffer(outlink, in->width, in->height);
    int ret;

    if (!out) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    ret = av_frame_copy_props(out, in);
    if (ret < 0)
        goto fail;
    ret = av_frame_copy(out, in);
    if (ret < 0)
        goto fail;
    av_frame_free(&in);
    return ff_filter_frame(outlink, out);
fail:
    av_frame_free(&in);
    av_frame_free(&out);
    return ret;
}

static const AVFilterPad avfilter_vf_copy_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_copy_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter ff_vf_copy = {
    .name        = "copy",
    .description = NULL_IF_CONFIG_SMALL("Copy the input video unchanged to the output."),
    .inputs      = avfilter_vf_copy_inputs,
    .outputs     = avfilter_vf_copy_outputs,
    .query_formats = query_formats,
};