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mpv/TOOLS/vf_dlopen/ildetect.c

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/*
* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv's vf_dlopen examples.
*
* mpv's vf_dlopen examples are free software; you can redistribute them and/or
* modify them 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.
*
* mpv's vf_dlopen examples are distributed in the hope that they 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 mpv's vf_dlopen examples; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "vf_dlopen.h"
#include "filterutils.h"
/*
* interlacing detector
*
* usage: -vf dlopen=./ildetect.so:<method>:<threshold>
*
* outputs an interlacing detection report at the end
*
* methods:
* 0 = transcode 32detect (default)
* 1 = decomb IsCombed
* 2 = IsCombedTIVTC
* 3 = simple average
*
* threshold:
* normalized at 1
*/
typedef struct {
int method;
double combing_threshold;
double motion_threshold;
double motion_amount;
double yes_threshold;
double no_threshold;
double total_yes_threshold;
double total_no_threshold;
double tc_threshold;
double decision_threshold;
double tc_decision_threshold;
double lastcombed;
int numtotalframes;
int numdecidedframes;
int totalcombedframes;
int numjumpingadjacentframes;
int numdecidedadjacentframes;
unsigned char *buffer_data;
size_t buffer_size;
} ildetect_data_t;
static int il_config(struct vf_dlopen_context *ctx)
{
ctx->out_height -= 4;
ctx->out_d_height = ctx->out_height;
return 1;
}
static int il_decision(struct vf_dlopen_context *ctx,
int p0, int p1, int p2, int p3, int p4)
{
ildetect_data_t *il = ctx->priv;
// model for threshold: p0, p2, p4 = 0; p1, p3 = t
switch (il->method) {
case 0: { // diff-diff (transcode 32detect)
int d12 = p1 - p2; // t
int d13 = p1 - p3; // 0
if (abs(d12) > 15 * il->combing_threshold &&
abs(d13) < 10 * il->combing_threshold)
return 1;
// true for t > 15
break;
}
case 1: { // multiply (decomb IsCombed)
int d12 = p1 - p2; // t
int d32 = p3 - p2; // t
if (d12 * d32 > pow(il->combing_threshold, 2) * (25*25))
return 1;
// true for t > 21
break;
}
case 2: { // blur-blur (IsCombedTIVTC)
int b024 = p0 + 6 * p2 + p4; // 0
int b13 = 4 * p1 + 4 * p3; // 8t
if (abs(b024 - b13) > il->combing_threshold * 8 * 20)
return 1;
// true for t > 20
break;
}
case 3: { // average-average
int d123 = p1 + p3 - 2 * p2; // 2t
int d024 = p0 + p4 - 2 * p2; // 0
if ((abs(d123) - abs(d024)) > il->combing_threshold * 30)
return 1;
// true for t > 15
break;
}
}
return 0;
}
static int il_put_image(struct vf_dlopen_context *ctx)
{
ildetect_data_t *il = ctx->priv;
unsigned int x, y;
int first_frame = 0;
size_t sz = ctx->inpic.planestride[0] * ctx->inpic.planeheight[0];
if (sz != il->buffer_size) {
il->buffer_data = realloc(il->buffer_data, sz);
il->buffer_size = sz;
first_frame = 1;
}
assert(ctx->inpic.planes == 1);
assert(ctx->outpic[0].planes == 1);
assert(ctx->inpic.planewidth[0] == ctx->outpic[0].planewidth[0]);
assert(ctx->inpic.planeheight[0] == ctx->outpic[0].planeheight[0] + 4);
if (first_frame) {
printf("First frame\n");
il->lastcombed = -1;
} else {
// detect interlacing
// for each row of 5 pixels, compare:
// p2 vs (p1 + p3) / 2
// p2 vs (p0 + p4) / 2
unsigned int totalcombedframes = 0; // add 255 per combed pixel
unsigned int totalpixels = 0;
for (y = 0; y < ctx->inpic.planeheight[0] - 4; ++y) {
unsigned char *in_line =
&ctx->inpic.plane[0][ctx->inpic.planestride[0] * y];
unsigned char *buf_line =
&il->buffer_data[ctx->inpic.planestride[0] * y];
unsigned char *out_line =
&ctx->outpic->plane[0][ctx->outpic->planestride[0] * y];
for (x = 0; x < ctx->inpic.planewidth[0]; ++x) {
int b2 = buf_line[x + ctx->inpic.planestride[0] * 2];
int p0 = in_line[x];
int p1 = in_line[x + ctx->inpic.planestride[0]];
int p2 = in_line[x + ctx->inpic.planestride[0] * 2];
int p3 = in_line[x + ctx->inpic.planestride[0] * 3];
int p4 = in_line[x + ctx->inpic.planestride[0] * 4];
int is_moving = abs(b2 - p2) > il->motion_threshold;
if (!is_moving) {
out_line[x] = 128;
continue;
}
++totalpixels;
int combed = il_decision(ctx, p0, p1, p2, p3, p4);
totalcombedframes += combed;
out_line[x] = 255 * combed;
}
}
double avgpixels = totalpixels / (double)
((ctx->inpic.planeheight[0] - 4) * ctx->inpic.planewidth[0]);
if (avgpixels > il->motion_amount) {
double avgcombed = totalcombedframes / (double) totalpixels;
if (il->lastcombed >= 0) {
if (il->lastcombed < il->no_threshold ||
il->lastcombed > il->yes_threshold)
if (avgcombed < il->no_threshold ||
avgcombed > il->yes_threshold)
++il->numdecidedadjacentframes;
if (il->lastcombed > il->yes_threshold &&
avgcombed < il->no_threshold)
++il->numjumpingadjacentframes;
if (il->lastcombed < il->no_threshold &&
avgcombed > il->yes_threshold)
++il->numjumpingadjacentframes;
}
il->lastcombed = avgcombed;
if (avgcombed > il->yes_threshold) {
++il->numdecidedframes;
++il->totalcombedframes;
} else if (avgcombed < il->no_threshold) {
++il->numdecidedframes;
}
} else
il->lastcombed = -1;
}
++il->numtotalframes;
copy_plane(
il->buffer_data, ctx->inpic.planestride[0],
ctx->inpic.plane[0], ctx->inpic.planestride[0],
ctx->inpic.planewidth[0],
ctx->inpic.planeheight[0]);
ctx->outpic[0].pts = ctx->inpic.pts;
return 1;
}
void il_uninit(struct vf_dlopen_context *ctx)
{
ildetect_data_t *il = ctx->priv;
double avgdecided = il->numtotalframes
? il->numdecidedframes / (double) il->numtotalframes : -1;
double avgadjacent = il->numdecidedframes
? il->numdecidedadjacentframes / (double) il->numdecidedframes : -1;
double avgscore = il->numdecidedframes
? il->totalcombedframes / (double) il->numdecidedframes : -1;
double avgjumps = il->numdecidedadjacentframes
? il->numjumpingadjacentframes / (double) il->numdecidedadjacentframes : -1;
printf("ildetect: Avg decided: %f\n", avgdecided);
printf("ildetect: Avg adjacent decided: %f\n", avgadjacent);
printf("ildetect: Avg interlaced decided: %f\n", avgscore);
printf("ildetect: Avg interlaced/progressive adjacent decided: %f\n", avgjumps);
if (avgdecided < il->decision_threshold)
avgadjacent = avgscore = avgjumps = -1;
if (avgadjacent < il->tc_decision_threshold)
avgadjacent = avgjumps = -1;
if (avgscore < 0)
printf("ildetect: Content is probably: undecided\n");
else if (avgscore < il->total_no_threshold)
printf("ildetect: Content is probably: PROGRESSIVE\n");
else if (avgscore > il->total_yes_threshold && avgjumps < 0)
printf("ildetect: Content is probably: INTERLACED (possibly telecined)\n");
else if (avgjumps > il->tc_threshold)
printf("ildetect: Content is probably: TELECINED\n");
else if (avgscore > il->total_yes_threshold)
printf("ildetect: Content is probably: INTERLACED\n");
else
printf("ildetect: Content is probably: unknown\n");
free(ctx->priv);
}
int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
{
VF_DLOPEN_CHECK_VERSION(ctx);
(void) argc;
(void) argv;
ildetect_data_t *il = malloc(sizeof(ildetect_data_t));
memset(il, 0, sizeof(*il));
#define A(i,d) ((argc>(i) && *argv[i]) ? atof(argv[i]) : (d))
il->method = A(0, 0);
il->combing_threshold = A(1, 1);
il->motion_threshold = A(2, 6);
il->motion_amount = A(3, 0.1);
il->yes_threshold = A(4, 0.1);
il->no_threshold = A(5, 0.05);
il->total_yes_threshold = A(6, 0.1);
il->total_no_threshold = A(7, 0.05);
il->tc_threshold = A(8, 0.1);
il->decision_threshold = A(9, 0.2);
il->tc_decision_threshold = A(10, 0.2);
static struct vf_dlopen_formatpair map[] = {
{ "gray", "gray" },
{ NULL, NULL }
};
ctx->format_mapping = map;
ctx->config = il_config;
ctx->put_image = il_put_image;
ctx->uninit = il_uninit;
ctx->priv = il;
return 1;
}
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