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/*
* Copyright (c) 2010 Mark Heath mjpeg0 @ silicontrip dot org
* Copyright (c) 2014 Clément Bœsch
* Copyright (c) 2014 Dave Rice @dericed
*
* 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/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
enum FilterMode {
FILTER_NONE = -1,
FILTER_TOUT,
FILTER_VREP,
FILTER_BRNG,
FILT_NUMB
};
typedef struct {
const AVClass *class;
int chromah; // height of chroma plane
int chromaw; // width of chroma plane
int hsub; // horizontal subsampling
int vsub; // vertical subsampling
int fs; // pixel count per frame
int cfs; // pixel count per frame of chroma planes
enum FilterMode outfilter;
int filters;
AVFrame *frame_prev;
char *vrep_line;
uint8_t rgba_color[4];
int yuv_color[3];
} SignalstatsContext;
#define OFFSET(x) offsetof(SignalstatsContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption signalstats_options[] = {
{"stat", "set statistics filters", OFFSET(filters), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "filters"},
{"tout", "analyze pixels for temporal outliers", 0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_TOUT}, 0, 0, FLAGS, "filters"},
{"vrep", "analyze video lines for vertical line repitition", 0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_VREP}, 0, 0, FLAGS, "filters"},
{"brng", "analyze for pixels outside of broadcast range", 0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_BRNG}, 0, 0, FLAGS, "filters"},
{"out", "set video filter", OFFSET(outfilter), AV_OPT_TYPE_INT, {.i64=FILTER_NONE}, -1, FILT_NUMB-1, FLAGS, "out"},
{"tout", "highlight pixels that depict temporal outliers", 0, AV_OPT_TYPE_CONST, {.i64=FILTER_TOUT}, 0, 0, FLAGS, "out"},
{"vrep", "highlight video lines that depict vertical line repitition", 0, AV_OPT_TYPE_CONST, {.i64=FILTER_VREP}, 0, 0, FLAGS, "out"},
{"brng", "highlight pixels that are outside of broadcast range", 0, AV_OPT_TYPE_CONST, {.i64=FILTER_BRNG}, 0, 0, FLAGS, "out"},
{"c", "set highlight color", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str="yellow"}, .flags=FLAGS},
{"color", "set highlight color", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str="yellow"}, .flags=FLAGS},
{NULL}
};
AVFILTER_DEFINE_CLASS(signalstats);
static av_cold int init(AVFilterContext *ctx)
{
uint8_t r, g, b;
SignalstatsContext *s = ctx->priv;
if (s->outfilter != FILTER_NONE)
s->filters |= 1 << s->outfilter;
r = s->rgba_color[0];
g = s->rgba_color[1];
b = s->rgba_color[2];
s->yuv_color[0] = (( 66*r + 129*g + 25*b + (1<<7)) >> 8) + 16;
s->yuv_color[1] = ((-38*r + -74*g + 112*b + (1<<7)) >> 8) + 128;
s->yuv_color[2] = ((112*r + -94*g + -18*b + (1<<7)) >> 8) + 128;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SignalstatsContext *s = ctx->priv;
av_frame_free(&s->frame_prev);
av_freep(&s->vrep_line);
}
static int query_formats(AVFilterContext *ctx)
{
// TODO: add more |
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SignalstatsContext *s = ctx->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
s->hsub = desc->log2_chroma_w;
s->vsub = desc->log2_chroma_h;
outlink->w = inlink->w;
outlink->h = inlink->h;
s->chromaw = FF_CEIL_RSHIFT(inlink->w, s->hsub);
s->chromah = FF_CEIL_RSHIFT(inlink->h, s->vsub);
s->fs = inlink->w * inlink->h;
s->cfs = s->chromaw * s->chromah;
if (s->filters & 1<<FILTER_VREP) {
s->vrep_line = av_malloc(inlink->h * sizeof(*s->vrep_line));
if (!s->vrep_line)
return AVERROR(ENOMEM);
}
return 0;
}
static void burn_frame(SignalstatsContext *s, AVFrame *f, int x, int y)
{
const int chromax = x >> s->hsub;
const int chromay = y >> s->vsub;
f->data[0][y * f->linesize[0] + x] = s->yuv_color[0];
f->data[1][chromay * f->linesize[1] + chromax] = s->yuv_color[1];
f->data[2][chromay * f->linesize[2] + chromax] = s->yuv_color[2];
}
static int filter_brng(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)
{
int x, score = 0;
const int yc = y >> s->vsub;
const uint8_t *pluma = &in->data[0][y * in->linesize[0]];
const uint8_t *pchromau = &in->data[1][yc * in->linesize[1]];
const uint8_t *pchromav = &in->data[2][yc * in->linesize[2]];
for (x = 0; x < w; x++) {
const int xc = x >> s->hsub;
const int luma = pluma[x];
const int chromau = pchromau[xc];
const int chromav = pchromav[xc];
const int filt = luma < 16 || luma > 235 ||
chromau < 16 || chromau > 240 ||
chromav < 16 || chromav > 240;
score += filt;
if (out && filt)
burn_frame(s, out, x, y);
}
return score;
}
static int filter_tout_outlier(uint8_t x, uint8_t y, uint8_t z)
{
return ((abs(x - y) + abs (z - y)) / 2) - abs(z - x) > 4; // make 4 configurable?
}
static int filter_tout(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)
{
const uint8_t *p = in->data[0];
int lw = in->linesize[0];
int x, score = 0, filt;
if (y - 1 < 0 || y + 1 >= h)
return 0;
// detect two pixels above and below (to eliminate interlace artefacts)
// should check that video format is infact interlaced.
#define FILTER(i, j) \
filter_tout_outlier(p[(y-j) * lw + x + i], \
p[ y * lw + x + i], \
p[(y+j) * lw + x + i])
#define FILTER3(j) (FILTER(-1, j) && FILTER(0, j) && FILTER(1, j))
if (y - 2 >= 0 && y + 2 < h) {
for (x = 1; x < w - 1; x++) {
filt = FILTER3(2) && FILTER3(1);
score += filt;
if (filt && out)
burn_frame(s, out, x, y);
}
} else {
for (x = 1; x < w - 1; x++) {
filt = FILTER3(1);
score += filt;
if (filt && out)
burn_frame(s, out, x, y);
}
}
return score;
}
#define VREP_START 4
static void filter_init_vrep(SignalstatsContext *s, const AVFrame *p, int w, int h)
{
int i, y;
int lw = p->linesize[0];
for (y = VREP_START; y < h; y++) {
int totdiff = 0;
int y2lw = (y - VREP_START) * lw;
int ylw = y * lw;
for (i = 0; i < w; i++)
totdiff += abs(p->data[0][y2lw + i] - p->data[0][ylw + i]);
/* this value should be definable */
s->vrep_line[y] = totdiff < w;
}
}
static int filter_vrep(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)
{
int x, score = 0;
if (y < VREP_START)
return 0;
for (x = 0; x < w; x++) {
if (s->vrep_line[y]) {
score++;
if (out)
burn_frame(s, out, x, y);
}
}
return score;
}
static const struct {
const char *name;
void (*init)(SignalstatsContext *s, const AVFrame *p, int w, int h);
int (*process)(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h);
} filters_def[] = {
{"TOUT", NULL, filter_tout},
{"VREP", filter_init_vrep, filter_vrep},
{"BRNG", NULL, filter_brng},
{NULL}
};
#define DEPTH 256
static int filter_frame(AVFilterLink *link, AVFrame *in)
{
SignalstatsContext *s = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[0];
AVFrame *out = in;
int i, j;
int w = 0, cw = 0, // in
pw = 0, cpw = 0; // prev
int yuv, yuvu, yuvv;
int fil;
char metabuf[128];
unsigned int histy[DEPTH] = {0},
histu[DEPTH] = {0},
histv[DEPTH] = {0},
histhue[360] = {0},
histsat[DEPTH] = {0}; // limited to 8 bit data.
int miny = -1, minu = -1, minv = -1;
int maxy = -1, maxu = -1, maxv = -1;
int lowy = -1, lowu = -1, lowv = -1;
int highy = -1, highu = -1, highv = -1;
int minsat = -1, maxsat = -1, lowsat = -1, highsat = -1;
int lowp, highp, clowp, chighp;
int accy, accu, accv;
int accsat, acchue = 0;
int medhue, maxhue;
int toty = 0, totu = 0, totv = 0, totsat=0;
int tothue = 0;
int dify = 0, difu = 0, difv = 0;
int filtot[FILT_NUMB] = {0};
AVFrame *prev;
if (!s->frame_prev)
s->frame_prev = av_frame_clone(in);
prev = s->frame_prev;
if (s->outfilter != FILTER_NONE)
out = av_frame_clone(in);
for (fil = 0; fil < FILT_NUMB; fil ++)
if ((s->filters & 1<<fil) && filters_def[fil].init)
filters_def[fil].init(s, in, link->w, link->h);
// Calculate luma histogram and difference with previous frame or field.
for (j = 0; j < link->h; j++) {
for (i = 0; i < link->w; i++) {
yuv = in->data[0][w + i];
histy[yuv]++;
dify += abs(in->data[0][w + i] - prev->data[0][pw + i]);
}
w += in->linesize[0];
pw += prev->linesize[0];
}
// Calculate chroma histogram and difference with previous frame or field.
for (j = 0; j < s->chromah; j++) {
for (i = 0; i < s->chromaw; i++) {
int sat, hue;
yuvu = in->data[1][cw+i];
yuvv = in->data[2][cw+i];
histu[yuvu]++;
difu += abs(in->data[1][cw+i] - prev->data[1][cpw+i]);
histv[yuvv]++;
difv += abs(in->data[2][cw+i] - prev->data[2][cpw+i]);
// int or round?
sat = hypot(yuvu - 128, yuvv - 128);
histsat[sat]++;
hue = floor((180 / M_PI) * atan2f(yuvu-128, yuvv-128) + 180);
histhue[hue]++;
}
cw += in->linesize[1];
cpw += prev->linesize[1];
}
for (j = 0; j < link->h; j++) {
for (fil = 0; fil < FILT_NUMB; fil ++) {
if (s->filters & 1<<fil) {
AVFrame *dbg = out != in && s->outfilter == fil ? out : NULL;
filtot[fil] += filters_def[fil].process(s, in, dbg, j, link->w, link->h);
}
}
}
// find low / high based on histogram percentile
// these only need to be calculated once.
lowp = lrint(s->fs * 10 / 100.);
highp = lrint(s->fs * 90 / 100.);
clowp = lrint(s->cfs * 10 / 100.);
chighp = lrint(s->cfs * 90 / 100.);
accy = accu = accv = accsat = 0;
for (fil = 0; fil < DEPTH; fil++) {
if (miny < 0 && histy[fil]) miny = fil;
if (minu < 0 && histu[fil]) minu = fil;
if (minv < 0 && histv[fil]) minv = fil;
if (minsat < 0 && histsat[fil]) minsat = fil;
if (histy[fil]) maxy = fil;
if (histu[fil]) maxu = fil;
if (histv[fil]) maxv = fil;
if (histsat[fil]) maxsat = fil;
toty += histy[fil] * fil;
totu += histu[fil] * fil;
totv += histv[fil] * fil;
totsat += histsat[fil] * fil;
accy += histy[fil];
accu += histu[fil];
accv += histv[fil];
accsat += histsat[fil];
if (lowy == -1 && accy >= lowp) lowy = fil;
if (lowu == -1 && accu >= clowp) lowu = fil;
if (lowv == -1 && accv >= clowp) lowv = fil;
if (lowsat == -1 && accsat >= clowp) lowsat = fil;
if (highy == -1 && accy >= highp) highy = fil;
if (highu == -1 && accu >= chighp) highu = fil;
if (highv == -1 && accv >= chighp) highv = fil;
if (highsat == -1 && accsat >= chighp) highsat = fil;
}
maxhue = histhue[0];
medhue = -1;
for (fil = 0; fil < 360; fil++) {
tothue += histhue[fil] * fil;
acchue += histhue[fil];
if (medhue == -1 && acchue > s->cfs / 2)
medhue = fil;
if (histhue[fil] > maxhue) {
maxhue = histhue[fil];
}
}
av_frame_free(&s->frame_prev);
s->frame_prev = av_frame_clone(in);
#define SET_META(key, fmt, val) do { \
snprintf(metabuf, sizeof(metabuf), fmt, val); \
av_dict_set(&out->metadata, "lavfi.signalstats." key, metabuf, 0); \
} while (0)
SET_META("YMIN", "%d", miny);
SET_META("YLOW", "%d", lowy);
SET_META("YAVG", "%g", 1.0 * toty / s->fs);
SET_META("YHIGH", "%d", highy);
SET_META("YMAX", "%d", maxy);
SET_META("UMIN", "%d", minu);
SET_META("ULOW", "%d", lowu);
SET_META("UAVG", "%g", 1.0 * totu / s->cfs);
SET_META("UHIGH", "%d", highu);
SET_META("UMAX", "%d", maxu);
SET_META("VMIN", "%d", minv);
SET_META("VLOW", "%d", lowv);
SET_META("VAVG", "%g", 1.0 * totv / s->cfs);
SET_META("VHIGH", "%d", highv);
SET_META("VMAX", "%d", maxv);
SET_META("SATMIN", "%d", minsat);
SET_META("SATLOW", "%d", lowsat);
SET_META("SATAVG", "%g", 1.0 * totsat / s->cfs);
SET_META("SATHIGH", "%d", highsat);
SET_META("SATMAX", "%d", maxsat);
SET_META("HUEMED", "%d", medhue);
SET_META("HUEAVG", "%g", 1.0 * tothue / s->cfs);
SET_META("YDIF", "%g", 1.0 * dify / s->fs);
SET_META("UDIF", "%g", 1.0 * difu / s->cfs);
SET_META("VDIF", "%g", 1.0 * difv / s->cfs);
for (fil = 0; fil < FILT_NUMB; fil ++) {
if (s->filters & 1<<fil) {
char metaname[128];
snprintf(metabuf, sizeof(metabuf), "%g", 1.0 * filtot[fil] / s->fs);
snprintf(metaname, sizeof(metaname), "lavfi.signalstats.%s", filters_def[fil].name);
av_dict_set(&out->metadata, metaname, metabuf, 0);
}
}
if (in != out)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad signalstats_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad signalstats_outputs[] = {
{
.name = "default",
.config_props = config_props,
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_signalstats = {
.name = "signalstats",
.description = "Generate statistics from video analysis.",
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(SignalstatsContext),
.inputs = signalstats_inputs,
.outputs = signalstats_outputs,
.priv_class = &signalstats_class,
}; |