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/*
* Copyright (c) 2011 Mark Himsley
*
* 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
* video field order filter, heavily influenced by vf_pad.c
*/
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct FieldOrderContext {
const AVClass *class;
int dst_tff; ///< output bff/tff
int line_size[4]; ///< bytes of pixel data per line for each plane
} FieldOrderContext;
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats;
enum AVPixelFormat pix_fmt;
int ret;
/** accept any input pixel format that is not hardware accelerated, not
* a bitstream format, and does not have vertically sub-sampled chroma */
if (ctx->inputs[0]) {
const AVPixFmtDescriptor *desc = NULL;
formats = NULL;
while ((desc = av_pix_fmt_desc_next(desc))) {
pix_fmt = av_pix_fmt_desc_get_id(desc);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
desc->nb_components && !desc->log2_chroma_h &&
(ret = ff_add_format(&formats, pix_fmt)) < 0)
return ret;
}
if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0 ||
(ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
return ret;
}
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
FieldOrderContext *s = ctx->priv;
return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
FieldOrderContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int h, plane, src_line_step, dst_line_step, line_size, line;
uint8_t *dst, *src;
AVFrame *out;
if (!frame->interlaced_frame ||
frame->top_field_first == s->dst_tff) {
av_log(ctx, AV_LOG_VERBOSE,
"Skipping %s.\n",
frame->interlaced_frame ?
"frame with same field order" : "progressive frame");
return ff_filter_frame(outlink, frame);
}
if (av_frame_is_writable(frame)) {
out = frame;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, frame);
}
av_log(ctx, AV_LOG_TRACE,
"picture will move %s one line\n",
s->dst_tff ? "up" : "down");
h = frame->height;
for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
dst_line_step = out->linesize[plane] * (h > 2);
src_line_step = frame->linesize[plane] * (h > 2);
line_size = s->line_size[plane];
dst = out->data[plane];
src = frame->data[plane];
if (s->dst_tff) {
/** Move every line up one line, working from
* the top to the bottom of the frame.
* The original top line is lost.
* The new last line is created as a copy of the
* penultimate line from that field. */
for (line = 0; line < h; line++) {
if (1 + line < frame->height) {
memcpy(dst, src + src_line_step, line_size);
} else {
memcpy(dst, src - 2 * src_line_step, line_size);
}
dst += dst_line_step;
src += src_line_step;
}
} else {
/** Move every line down one line, working from
* the bottom to the top of the frame.
* The original bottom line is lost.
* The new first line is created as a copy of the
* second line from that field. */
dst += (h - 1) * dst_line_step;
src += (h - 1) * src_line_step;
for (line = h - 1; line >= 0 ; line--) {
if (line > 0) {
memcpy(dst, src - src_line_step, line_size);
} else {
memcpy(dst, src + 2 * src_line_step, line_size);
}
dst -= dst_line_step;
src -= src_line_step;
}
}
}
out->top_field_first = s->dst_tff;
if (frame != out)
av_frame_free(&frame);
return ff_filter_frame(outlink, out);
}
#define OFFSET(x) offsetof(FieldOrderContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption fieldorder_options[] = {
{ "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
{ "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" },
{ "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(fieldorder);
static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_fieldorder = {
.name = "fieldorder",
.description = NULL_IF_CONFIG_SMALL("Set the field order."),
.priv_size = sizeof(FieldOrderContext),
.priv_class = &fieldorder_class,
.query_formats = query_formats,
.inputs = avfilter_vf_fieldorder_inputs,
.outputs = avfilter_vf_fieldorder_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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