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/*
* Copyright (c) 2012 Stefano Sabatini
*
* 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
*/
/**
* @file
* set field order
*/
#include "avfilter.h"
enum SetFieldMode {
MODE_AUTO = -1,
MODE_BFF,
MODE_TFF,
MODE_PROG,
};
typedef struct {
enum SetFieldMode mode;
} SetFieldContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
SetFieldContext *setfield = ctx->priv;
setfield->mode = MODE_AUTO;
if (args) {
char c;
if (sscanf(args, "%d%c", &setfield->mode, &c) != 1) {
if (!strcmp("tff", args)) setfield->mode = MODE_TFF;
else if (!strcmp("bff", args)) setfield->mode = MODE_BFF;
else if (!strcmp("prog", args)) setfield->mode = MODE_PROG;
else if (!strcmp("auto", args)) setfield->mode = MODE_AUTO;
else {
av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", args);
return AVERROR(EINVAL);
}
} else {
if (setfield->mode < -1 || setfield->mode > 1) {
av_log(ctx, AV_LOG_ERROR,
"Provided integer value %d must be included between -1 and +1\n",
setfield->mode);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_WARNING,
"Using -1/0/1 is deprecated, use auto/tff/bff/prog\n");
}
}
return 0;
}
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
SetFieldContext *setfield = inlink->dst->priv;
AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
if (setfield->mode == MODE_PROG) {
outpicref->video->interlaced = 0;
} else if (setfield->mode != MODE_AUTO) {
outpicref->video->interlaced = 1;
outpicref->video->top_field_first = setfield->mode;
}
avfilter_start_frame(inlink->dst->outputs[0], outpicref);
}
AVFilter avfilter_vf_setfield = {
.name = "setfield",
.description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
.init = init,
.priv_size = sizeof(SetFieldContext),
.inputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = start_frame, },
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL }
},
};
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