mirror of
https://github.com/FFmpeg/FFmpeg.git
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147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
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* Copyright (c) 2013 Paul B Mahol
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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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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct {
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int nb_planes;
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AVFrame *second;
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} SeparateFieldsContext;
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static int config_props_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SeparateFieldsContext *sf = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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sf->nb_planes = av_pix_fmt_count_planes(inlink->format);
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if (inlink->h & 1) {
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av_log(ctx, AV_LOG_ERROR, "height must be even\n");
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return AVERROR_INVALIDDATA;
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}
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outlink->time_base.num = inlink->time_base.num;
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outlink->time_base.den = inlink->time_base.den * 2;
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outlink->frame_rate.num = inlink->frame_rate.num * 2;
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outlink->frame_rate.den = inlink->frame_rate.den;
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outlink->w = inlink->w;
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outlink->h = inlink->h / 2;
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return 0;
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}
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static void extract_field(AVFrame *frame, int nb_planes, int type)
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{
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int i;
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for (i = 0; i < nb_planes; i++) {
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if (type)
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frame->data[i] = frame->data[i] + frame->linesize[i];
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frame->linesize[i] *= 2;
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
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{
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AVFilterContext *ctx = inlink->dst;
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SeparateFieldsContext *sf = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int ret;
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inpicref->height = outlink->h;
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inpicref->interlaced_frame = 0;
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if (!sf->second) {
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goto clone;
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} else {
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AVFrame *second = sf->second;
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extract_field(second, sf->nb_planes, second->top_field_first);
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if (second->pts != AV_NOPTS_VALUE &&
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inpicref->pts != AV_NOPTS_VALUE)
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second->pts += inpicref->pts;
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else
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second->pts = AV_NOPTS_VALUE;
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ret = ff_filter_frame(outlink, second);
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if (ret < 0)
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return ret;
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clone:
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sf->second = av_frame_clone(inpicref);
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if (!sf->second)
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return AVERROR(ENOMEM);
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}
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extract_field(inpicref, sf->nb_planes, !inpicref->top_field_first);
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if (inpicref->pts != AV_NOPTS_VALUE)
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inpicref->pts *= 2;
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return ff_filter_frame(outlink, inpicref);
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SeparateFieldsContext *sf = ctx->priv;
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int ret;
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ret = ff_request_frame(ctx->inputs[0]);
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if (ret == AVERROR_EOF && sf->second) {
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sf->second->pts *= 2;
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extract_field(sf->second, sf->nb_planes, sf->second->top_field_first);
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ret = ff_filter_frame(outlink, sf->second);
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sf->second = 0;
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}
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return ret;
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}
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static const AVFilterPad separatefields_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad separatefields_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props_output,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_separatefields = {
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.name = "separatefields",
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.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
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.priv_size = sizeof(SeparateFieldsContext),
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.inputs = separatefields_inputs,
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.outputs = separatefields_outputs,
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};
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