/* * 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 "filters.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,    },}; const FFFilter ff_af_acopy = {    .p.name        = "acopy",    .p.description = NULL_IF_CONFIG_SMALL("Copy the input audio unchanged to the output."),    .p.flags       = AVFILTER_FLAG_METADATA_ONLY,    FILTER_INPUTS(acopy_inputs),    FILTER_OUTPUTS(ff_audio_default_filterpad),};