FFmpeg/libavfilter/af_acopy.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
 */

#include "audio.h"
#include "avfilter.h"
#include "internal.h"

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterLink *outlink = inlink->dst->outputs[0];
    AVFrame *out = ff_get_audio_buffer(outlink, in->nb_samples);
    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 acopy_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
};

static const AVFilterPad acopy_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_AUDIO,
    },
};

const AVFilter ff_af_acopy = {
    .name          = "acopy",
    .description   = NULL_IF_CONFIG_SMALL("Copy the input audio unchanged to the output."),
    .flags         = AVFILTER_FLAG_METADATA_ONLY,
    FILTER_INPUTS(acopy_inputs),
    FILTER_OUTPUTS(acopy_outputs),
};