/*
* Copyright (c) 2004 Ville Saari
*
* 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/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
enum PhaseMode {
PROGRESSIVE,
TOP_FIRST,
BOTTOM_FIRST,
TOP_FIRST_ANALYZE,
BOTTOM_FIRST_ANALYZE,
ANALYZE,
FULL_ANALYZE,
AUTO,
AUTO_ANALYZE
};
typedef struct PhaseContext {
const AVClass *class;
int mode; ///<PhaseMode
AVFrame *frame; /* previous frame */
int nb_planes;
int planeheight[4];
int linesize[4];
} PhaseContext;
#define OFFSET(x) offsetof(PhaseContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
static const AVOption phase_options[] = {
{ "mode", "set phase mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=AUTO_ANALYZE}, PROGRESSIVE, AUTO_ANALYZE, FLAGS, "mode" },
CONST("p", "progressive", PROGRESSIVE, "mode"),
CONST("t", "top first", TOP_FIRST, "mode"),
CONST("b", "bottom first", BOTTOM_FIRST, "mode"),
CONST("T", "top first analyze", TOP_FIRST_ANALYZE, "mode"),
CONST("B", "bottom first analyze", BOTTOM_FIRST_ANALYZE, "mode"),
CONST("u", "analyze", ANALYZE, "mode"),
CONST("U", "full analyze", FULL_ANALYZE, "mode"),
CONST("a", "auto", AUTO, "mode"),
CONST("A", "auto analyze", AUTO_ANALYZE, "mode"),
{ NULL }
};
AVFILTER_DEFINE_CLASS(phase);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
static int config_input(AVFilterLink *inlink)
{
PhaseContext *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;
}
/*
* This macro interpolates the value of both fields at a point halfway
* between lines and takes the squared difference. In field resolution
* the point is a quarter pixel below a line in one field and a quarter
* pixel above a line in other.
*
* (The result is actually multiplied by 25)
*/
#define DIFF(a, as, b, bs) ((t) = ((*(a) - (b)[bs]) << 2) + (a)[(as) << 1] - (b)[-(bs)], (t) * (t))
/*
* Find which field combination has the smallest average squared difference
* between the fields.
*/
static enum PhaseMode analyze_plane(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new)
{
double bdiff, tdiff, pdiff;
if (mode == AUTO) {
mode = new->interlaced_frame ? new->top_field_first ?
TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE;
} else if (mode == AUTO_ANALYZE) {
mode = new->interlaced_frame ? new->top_field_first ?
TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE;
}
if (mode <= BOTTOM_FIRST) {
bdiff = pdiff = tdiff = 65536.0;
} else {
const int ns = new->linesize[0];
const int os = old->linesize[0];
const uint8_t *nptr = new->data[0];
const uint8_t *optr = old->data[0];
const int h = new->height;
const int w = new->width;
int bdif, tdif, pdif;
double scale;
int top = 0, t;
const uint8_t *rend, *end = nptr + (h - 2) * ns;
bdiff = pdiff = tdiff = 0.0;
nptr += ns;
optr += os;
while (nptr < end) {
pdif = tdif = bdif = 0;
switch (mode) {
case TOP_FIRST_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(nptr, ns, optr, os);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
case BOTTOM_FIRST_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(nptr, ns, optr, os);
}
}
break;
case ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
tdif += DIFF(nptr, ns, optr, os);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
bdif += DIFF(nptr, ns, optr, os);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
case FULL_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(nptr, ns, optr, os);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(nptr, ns, optr, os);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
default:
av_assert0(0);
}
pdiff += (double)pdif;
tdiff += (double)tdif;
bdiff += (double)bdif;
nptr += ns - w;
optr += os - w;
top ^= 1;
}
scale = 1.0 / (w * (h - 3)) / 25.0;
pdiff *= scale;
tdiff *= scale;
bdiff *= scale;
if (mode == TOP_FIRST_ANALYZE) {
bdiff = 65536.0;
} else if (mode == BOTTOM_FIRST_ANALYZE) {
tdiff = 65536.0;
} else if (mode == ANALYZE) {
pdiff = 65536.0;
}
if (bdiff < pdiff && bdiff < tdiff) {
mode = BOTTOM_FIRST;
} else if (tdiff < pdiff && tdiff < bdiff) {
mode = TOP_FIRST;
} else {
mode = PROGRESSIVE;
}
}
av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n",
mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p',
tdiff, bdiff, pdiff);
return mode;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
PhaseContext *s = ctx->priv;
enum PhaseMode mode;
int plane, top, y;
AVFrame *out;
if (ctx->is_disabled) {
av_frame_free(&s->frame);
/* we keep a reference to the previous frame so the filter can start
* being useful as soon as it's not disabled, avoiding the 1-frame
* delay. */
s->frame = av_frame_clone(in);
return ff_filter_frame(outlink, in);
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
if (!s->frame) {
s->frame = in;
mode = PROGRESSIVE;
} else {
mode = analyze_plane(ctx, s->mode, s->frame, in);
}
for (plane = 0; plane < s->nb_planes; plane++) {
const uint8_t *buf = s->frame->data[plane];
const uint8_t *from = in->data[plane];
uint8_t *to = out->data[plane];
for (y = 0, top = 1; y < s->planeheight[plane]; y++, top ^= 1) {
memcpy(to, mode == (top ? BOTTOM_FIRST : TOP_FIRST) ? buf : from, s->linesize[plane]);
buf += s->frame->linesize[plane];
from += in->linesize[plane];
to += out->linesize[plane];
}
}
if (in != s->frame)
av_frame_free(&s->frame);
s->frame = in;
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
PhaseContext *s = ctx->priv;
av_frame_free(&s->frame);
}
static const AVFilterPad phase_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad phase_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_phase = {
.name = "phase",
.description = NULL_IF_CONFIG_SMALL("Phase shift fields."),
.priv_size = sizeof(PhaseContext),
.priv_class = &phase_class,
.uninit = uninit,
.query_formats = query_formats,
.inputs = phase_inputs,
.outputs = phase_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};