mirror of https://git.ffmpeg.org/ffmpeg.git
93 lines
2.9 KiB
C
93 lines
2.9 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 "avfilter.h"
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typedef struct {
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int top_field_first;
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} SetFieldContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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SetFieldContext *setfield = ctx->priv;
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setfield->top_field_first = -1;
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if (args) {
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char c;
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if (sscanf(args, "%d%c", &setfield->top_field_first, &c) != 1) {
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if (!strcmp("tff", args)) setfield->top_field_first = 1;
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else if (!strcmp("bff", args)) setfield->top_field_first = 0;
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else if (!strcmp("auto", args)) setfield->top_field_first = -1;
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else {
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av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", args);
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return AVERROR(EINVAL);
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}
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}
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}
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if (setfield->top_field_first < -1 || setfield->top_field_first > 1) {
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av_log(ctx, AV_LOG_ERROR,
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"Provided integer value %d must be included between -1 and +1\n",
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setfield->top_field_first);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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SetFieldContext *setfield = inlink->dst->priv;
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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if (setfield->top_field_first != -1) {
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outpicref->video->interlaced = 1;
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outpicref->video->top_field_first = setfield->top_field_first;
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}
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avfilter_start_frame(inlink->dst->outputs[0], outpicref);
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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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.priv_size = sizeof(SetFieldContext),
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.inputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = start_frame, },
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL }
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},
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};
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