116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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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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* set field order
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*/
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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enum SetFieldMode {
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MODE_AUTO = -1,
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MODE_BFF,
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MODE_TFF,
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MODE_PROG,
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};
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typedef struct {
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const AVClass *class;
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enum SetFieldMode mode;
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} SetFieldContext;
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#define OFFSET(x) offsetof(SetFieldContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption setfield_options[] = {
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{"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_AUTO}, -1, MODE_PROG, FLAGS, "mode"},
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{"auto", "keep the same input field", 0, AV_OPT_TYPE_CONST, {.i64=MODE_AUTO}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{"bff", "mark as bottom-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_BFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{"tff", "mark as top-field-first", 0, AV_OPT_TYPE_CONST, {.i64=MODE_TFF}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{"prog", "mark as progressive", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PROG}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(setfield);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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SetFieldContext *setfield = ctx->priv;
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static const char *shorthand[] = { "mode", NULL };
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setfield->class = &setfield_class;
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av_opt_set_defaults(setfield);
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return av_opt_set_from_string(setfield, args, shorthand, "=", ":");
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SetFieldContext *setfield = ctx->priv;
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av_opt_free(setfield);
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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SetFieldContext *setfield = inlink->dst->priv;
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if (setfield->mode == MODE_PROG) {
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picref->video->interlaced = 0;
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} else if (setfield->mode != MODE_AUTO) {
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picref->video->interlaced = 1;
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picref->video->top_field_first = setfield->mode;
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}
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return ff_filter_frame(inlink->dst->outputs[0], picref);
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}
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static const AVFilterPad setfield_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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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 setfield_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_setfield = {
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.name = "setfield",
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.description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(SetFieldContext),
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.inputs = setfield_inputs,
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.outputs = setfield_outputs,
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.priv_class = &setfield_class,
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};
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