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/*
* Copyright (c) 2016 Paul B Mahol
*
* 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 "avfilter.h"
#include "filters.h"
#include "video.h"
typedef struct BPNContext {
const AVClass *class;
int bitplane;
int filter;
int nb_planes;
int planeheight[4];
int planewidth[4];
int depth;
} BPNContext;
#define OFFSET(x) offsetof(BPNContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption bitplanenoise_options[] = {
{ "bitplane", "set bit plane to use for measuring noise", OFFSET(bitplane), AV_OPT_TYPE_INT, {.i64=1}, 1, 16, FLAGS},
{ "filter", "show noisy pixels", OFFSET(filter), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{ NULL }
};
AVFILTER_DEFINE_CLASS(bitplanenoise);
static const enum AVPixelFormat pixfmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
static int config_input(AVFilterLink *inlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
AVFilterContext *ctx = inlink->dst;
BPNContext *s = ctx->priv;
s->nb_planes = desc->nb_components;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->depth = desc->comp[0].depth;
return 0;
}
#define CHECK_BIT(x, a, b, c) { \
bit = (((val[(x)] & mask) == (val[(x) + (a)] & mask)) + \
((val[(x)] & mask) == (val[(x) + (b)] & mask)) + \
((val[(x)] & mask) == (val[(x) + (c)] & mask))) > 1; \
if (dst) \
dst[(x)] = factor * bit; \
stats[plane] += bit; }
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
BPNContext *s = ctx->priv;
const int mask = (1 << (s->bitplane - 1));
const int factor = (1 << s->depth) - 1;
float stats[4] = { 0 };
char metabuf[128];
int plane, y, x, bit;
AVFrame *out = s->filter ? NULL : in;
if (!out) {
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->depth <= 8) {
for (plane = 0; plane < s->nb_planes; plane++) {
const int linesize = s->planeheight[plane] > 1 ? in->linesize[plane] : 0;
const int dlinesize = out->linesize[plane];
uint8_t *val = in->data[plane];
uint8_t *dst = s->filter ? out->data[plane]: NULL;
for (y = 0; y < s->planeheight[plane] - 1; y++) {
CHECK_BIT(0, 1, 1 + linesize, linesize)
for (x = 1; x < s->planewidth[plane] - 1; x++) {
CHECK_BIT(x, -1, 1, linesize)
}
CHECK_BIT(x, -1, -1 + linesize, linesize)
val += linesize;
if (dst)
dst += dlinesize;
}
CHECK_BIT(0, 1, 1 - linesize, -linesize)
for (x = 1; x < s->planewidth[plane] - 1; x++) {
CHECK_BIT(x, -1, 1, -linesize)
}
CHECK_BIT(x, -1, -1 - linesize, -linesize)
}
} else {
for (plane = 0; plane < s->nb_planes; plane++) {
const int linesize = s->planeheight[plane] > 1 ? in->linesize[plane] / 2 : 0;
const int dlinesize = out->linesize[plane] / 2;
uint16_t *val = (uint16_t *)in->data[plane];
uint16_t *dst = s->filter ? (uint16_t *)out->data[plane] : NULL;
val = (uint16_t *)in->data[plane];
for (y = 0; y < s->planeheight[plane] - 1; y++) {
CHECK_BIT(0, 1, 1 + linesize, linesize)
for (x = 1; x < s->planewidth[plane] - 1; x++) {
CHECK_BIT(x, -1, 1, linesize)
}
CHECK_BIT(x, -1, -1 + linesize, linesize)
val += linesize;
if (dst)
dst += dlinesize;
}
CHECK_BIT(0, 1, 1 - linesize, -linesize)
for (x = 1; x < s->planewidth[plane] - 1; x++) {
CHECK_BIT(x, -1, 1, -linesize)
}
CHECK_BIT(x, -1, -1 -linesize, -linesize)
}
}
for (plane = 0; plane < s->nb_planes; plane++) {
char key[32];
stats[plane] /= s->planewidth[plane] * s->planeheight[plane];
snprintf(key, sizeof(key), "lavfi.bitplanenoise.%d.%d", plane, s->bitplane);
snprintf(metabuf, sizeof(metabuf), "%f", 1. - 2.* fabs((stats[plane] - 0.5)));
av_dict_set(&out->metadata, key, metabuf, 0);
}
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const AVFilter ff_vf_bitplanenoise = {
.name = "bitplanenoise",
.description = NULL_IF_CONFIG_SMALL("Measure bit plane noise."),
.priv_size = sizeof(BPNContext),
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_PIXFMTS_ARRAY(pixfmts),
.priv_class = &bitplanenoise_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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