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/*
* Copyright (c) 2013 Paul B Mahol
*
* 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
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
typedef struct WeaveContext {
const AVClass *class;
int first_field;
int double_weave;
int nb_planes;
int planeheight[4];
int linesize[4];
AVFrame *prev;
} WeaveContext;
#define OFFSET(x) offsetof(WeaveContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption weave_options[] = {
{ "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
{ "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
{ "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
{ "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
{ "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
{ NULL }
};
AVFILTER_DEFINE_CLASS(weave);
static int config_props_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
WeaveContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
if (!s->double_weave) {
outlink->time_base.num = inlink->time_base.num * 2;
outlink->time_base.den = inlink->time_base.den;
outlink->frame_rate.num = inlink->frame_rate.num;
outlink->frame_rate.den = inlink->frame_rate.den * 2;
}
outlink->w = inlink->w;
outlink->h = inlink->h * 2;
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
WeaveContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int i;
int weave;
int field1, field2;
if (!s->prev) {
s->prev = in;
return 0;
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
av_frame_free(&s->prev);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
weave = (s->double_weave && !(inlink->frame_count_out & 1));
field1 = weave ? s->first_field : (!s->first_field);
field2 = weave ? (!s->first_field) : s->first_field;
for (i = 0; i < s->nb_planes; i++) {
av_image_copy_plane(out->data[i] + out->linesize[i] * field1,
out->linesize[i] * 2,
in->data[i], in->linesize[i],
s->linesize[i], s->planeheight[i]);
av_image_copy_plane(out->data[i] + out->linesize[i] * field2,
out->linesize[i] * 2,
s->prev->data[i], s->prev->linesize[i],
s->linesize[i], s->planeheight[i]);
}
out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
out->interlaced_frame = 1;
out->top_field_first = !s->first_field;
if (!s->double_weave)
av_frame_free(&in);
av_frame_free(&s->prev);
if (s->double_weave)
s->prev = in;
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
WeaveContext *s = ctx->priv;
av_frame_free(&s->prev);
}
static const AVFilterPad weave_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad weave_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_output,
},
{ NULL }
};
AVFilter ff_vf_weave = {
.name = "weave",
.description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
.priv_size = sizeof(WeaveContext),
.priv_class = &weave_class,
.uninit = uninit,
.inputs = weave_inputs,
.outputs = weave_outputs,
};
static av_cold int init(AVFilterContext *ctx)
{
WeaveContext *s = ctx->priv;
if (!strcmp(ctx->filter->name, "doubleweave"))
s->double_weave = 1;
return 0;
}
#define doubleweave_options weave_options
AVFILTER_DEFINE_CLASS(doubleweave);
AVFilter ff_vf_doubleweave = {
.name = "doubleweave",
.description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
.priv_size = sizeof(WeaveContext),
.priv_class = &doubleweave_class,
.init = init,
.uninit = uninit,
.inputs = weave_inputs,
.outputs = weave_outputs,
};
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