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/*
* Copyright (c) 2003 Tobias Diedrich
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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 "avfilter.h"
#include "internal.h"
typedef struct RepeatFieldsContext {
const AVClass *class;
int state;
int nb_planes;
int linesize[4];
int planeheight[4];
AVFrame *frame;
} RepeatFieldsContext;
static av_cold void uninit(AVFilterContext *ctx)
{
RepeatFieldsContext *s = ctx->priv;
av_frame_free(&s->frame);
}
static const enum AVPixelFormat pixel_fmts_eq[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NONE
};
static int config_input(AVFilterLink *inlink)
{
RepeatFieldsContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
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 void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
{
if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
) {
f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
} else
f->pts = AV_NOPTS_VALUE;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = inlink->dst->outputs[0];
RepeatFieldsContext *s = ctx->priv;
AVFrame *out;
int ret, i;
int state = s->state;
if (!s->frame) {
s->frame = av_frame_clone(in);
if (!s->frame)
return AVERROR(ENOMEM);
s->frame->pts = AV_NOPTS_VALUE;
}
out = s->frame;
if ((state == 0 && !in->top_field_first) ||
(state == 1 && in->top_field_first)) {
av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
"state=%d top_field_first=%d repeat_first_field=%d\n",
state, in->top_field_first, in->repeat_pict);
state ^= 1;
}
if (state == 0) {
AVFrame *new;
new = av_frame_clone(in);
if (!new)
return AVERROR(ENOMEM);
ret = ff_filter_frame(outlink, new);
if (in->repeat_pict) {
av_frame_make_writable(out);
update_pts(outlink, out, in->pts, 2);
for (i = 0; i < s->nb_planes; i++) {
av_image_copy_plane(out->data[i], out->linesize[i] * 2,
in->data[i], in->linesize[i] * 2,
s->linesize[i], s->planeheight[i] / 2);
}
state = 1;
}
} else {
for (i = 0; i < s->nb_planes; i++) {
av_frame_make_writable(out);
av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
in->data[i] + in->linesize[i], in->linesize[i] * 2,
s->linesize[i], s->planeheight[i] / 2);
}
ret = ff_filter_frame(outlink, av_frame_clone(out));
if (in->repeat_pict) {
AVFrame *new;
new = av_frame_clone(in);
if (!new)
return AVERROR(ENOMEM);
ret = ff_filter_frame(outlink, new);
state = 0;
} else {
av_frame_make_writable(out);
update_pts(outlink, out, in->pts, 1);
for (i = 0; i < s->nb_planes; i++) {
av_image_copy_plane(out->data[i], out->linesize[i] * 2,
in->data[i], in->linesize[i] * 2,
s->linesize[i], s->planeheight[i] / 2);
}
}
}
s->state = state;
av_frame_free(&in);
return ret;
}
static const AVFilterPad repeatfields_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad repeatfields_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_repeatfields = {
.name = "repeatfields",
.description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
.priv_size = sizeof(RepeatFieldsContext),
.uninit = uninit,
FILTER_INPUTS(repeatfields_inputs),
FILTER_OUTPUTS(repeatfields_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts_eq),
};
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