mirror of
https://github.com/FFmpeg/FFmpeg.git
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119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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* Copyright (c) 2012 Andrey Utkin
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Filter that changes number of samples on single output operation
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "filters.h"
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#include "internal.h"
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#include "formats.h"
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typedef struct ASNSContext {
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const AVClass *class;
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int nb_out_samples; ///< how many samples to output
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int pad;
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} ASNSContext;
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#define OFFSET(x) offsetof(ASNSContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption asetnsamples_options[] = {
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{ "nb_out_samples", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
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{ "n", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
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{ "pad", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
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{ "p", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(asetnsamples);
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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ASNSContext *s = ctx->priv;
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AVFrame *frame = NULL, *pad_frame;
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int ret;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_samples(inlink, s->nb_out_samples, s->nb_out_samples, &frame);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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if ((!s->pad || (s->pad && frame->nb_samples == s->nb_out_samples)))
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return ff_filter_frame(outlink, frame);
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pad_frame = ff_get_audio_buffer(outlink, s->nb_out_samples);
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if (!pad_frame) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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av_samples_copy(pad_frame->extended_data, frame->extended_data,
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0, 0, frame->nb_samples, frame->channels, frame->format);
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av_samples_set_silence(pad_frame->extended_data, frame->nb_samples,
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s->nb_out_samples - frame->nb_samples, frame->channels,
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frame->format);
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av_frame_free(&frame);
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return ff_filter_frame(outlink, pad_frame);
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static const AVFilterPad asetnsamples_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{ NULL }
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};
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static const AVFilterPad asetnsamples_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{ NULL }
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};
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AVFilter ff_af_asetnsamples = {
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.name = "asetnsamples",
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.description = NULL_IF_CONFIG_SMALL("Set the number of samples for each output audio frames."),
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.priv_size = sizeof(ASNSContext),
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.priv_class = &asetnsamples_class,
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.inputs = asetnsamples_inputs,
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.outputs = asetnsamples_outputs,
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.activate = activate,
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};
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