/* * 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);     if (!out) {        av_frame_free(&in);        return AVERROR(ENOMEM);    }    av_frame_copy_props(out, in);    av_frame_copy(out, in);    av_frame_free(&in);    return ff_filter_frame(outlink, out);} static const AVFilterPad acopy_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad acopy_outputs[] = {    {        .name = "default",        .type = AVMEDIA_TYPE_AUDIO,    },    { NULL }}; AVFilter ff_af_acopy = {    .name          = "acopy",    .description   = NULL_IF_CONFIG_SMALL("Copy the input audio unchanged to the output."),    .inputs        = acopy_inputs,    .outputs       = acopy_outputs,};