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FFmpeg/libavfilter/vf_vif.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) 2017 Ronald S. Bultje <rsbultje@gmail.com>
* Copyright (c) 2017 Ashish Pratap Singh <ashk43712@gmail.com>
* Copyright (c) 2021 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
*/
/**
* @file
* Calculate VIF between two input videos.
*/
#include <float.h>
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "framesync.h"
#include "internal.h"
#define NUM_DATA_BUFS 13
typedef struct VIFContext {
const AVClass *class;
FFFrameSync fs;
const AVPixFmtDescriptor *desc;
int width;
int height;
int nb_threads;
float factor;
float *data_buf[NUM_DATA_BUFS];
float **temp;
float *ref_data;
float *main_data;
double vif_sum[4];
double vif_min[4];
double vif_max[4];
uint64_t nb_frames;
} VIFContext;
#define OFFSET(x) offsetof(VIFContext, x)
static const AVOption vif_options[] = {
{ NULL }
};
FRAMESYNC_DEFINE_CLASS(vif, VIFContext, fs);
static const uint8_t vif_filter1d_width1[4] = { 17, 9, 5, 3 };
static const float vif_filter1d_table[4][17] =
{
{
0.00745626912, 0.0142655009, 0.0250313189, 0.0402820669, 0.0594526194,
0.0804751068, 0.0999041125, 0.113746084, 0.118773937, 0.113746084,
0.0999041125, 0.0804751068, 0.0594526194, 0.0402820669, 0.0250313189,
0.0142655009, 0.00745626912
},
{
0.0189780835, 0.0558981746, 0.120920904, 0.192116052, 0.224173605,
0.192116052, 0.120920904, 0.0558981746, 0.0189780835
},
{
0.054488685, 0.244201347, 0.402619958, 0.244201347, 0.054488685
},
{
0.166378498, 0.667243004, 0.166378498
}
};
typedef struct ThreadData {
const float *filter;
const float *src;
float *dst;
int w, h;
int src_stride;
int dst_stride;
int filter_width;
float **temp;
} ThreadData;
static void vif_dec2(const float *src, float *dst, int w, int h,
int src_stride, int dst_stride)
{
const int dst_px_stride = dst_stride / 2;
for (int i = 0; i < h / 2; i++) {
for (int j = 0; j < w / 2; j++)
dst[i * dst_px_stride + j] = src[(i * 2) * src_stride + (j * 2)];
}
}
static void vif_statistic(const float *mu1_sq, const float *mu2_sq,
const float *mu1_mu2, const float *xx_filt,
const float *yy_filt, const float *xy_filt,
float *num, float *den, int w, int h)
{
static const float sigma_nsq = 2;
float mu1_sq_val, mu2_sq_val, mu1_mu2_val, xx_filt_val, yy_filt_val, xy_filt_val;
float sigma1_sq, sigma2_sq, sigma12, g, sv_sq, eps = 1.0e-10f;
float gain_limit = 100.f;
float num_val, den_val;
float accum_num = 0.0f;
float accum_den = 0.0f;
for (int i = 0; i < h; i++) {
float accum_inner_num = 0.f;
float accum_inner_den = 0.f;
for (int j = 0; j < w; j++) {
mu1_sq_val = mu1_sq[i * w + j];
mu2_sq_val = mu2_sq[i * w + j];
mu1_mu2_val = mu1_mu2[i * w + j];
xx_filt_val = xx_filt[i * w + j];
yy_filt_val = yy_filt[i * w + j];
xy_filt_val = xy_filt[i * w + j];
sigma1_sq = xx_filt_val - mu1_sq_val;
sigma2_sq = yy_filt_val - mu2_sq_val;
sigma12 = xy_filt_val - mu1_mu2_val;
sigma1_sq = FFMAX(sigma1_sq, 0.0f);
sigma2_sq = FFMAX(sigma2_sq, 0.0f);
sigma12 = FFMAX(sigma12, 0.0f);
g = sigma12 / (sigma1_sq + eps);
sv_sq = sigma2_sq - g * sigma12;
if (sigma1_sq < eps) {
g = 0.0f;
sv_sq = sigma2_sq;
sigma1_sq = 0.0f;
}
if (sigma2_sq < eps) {
g = 0.0f;
sv_sq = 0.0f;
}
if (g < 0.0f) {
sv_sq = sigma2_sq;
g = 0.0f;
}
sv_sq = FFMAX(sv_sq, eps);
g = FFMIN(g, gain_limit);
num_val = log2f(1.0f + g * g * sigma1_sq / (sv_sq + sigma_nsq));
den_val = log2f(1.0f + sigma1_sq / sigma_nsq);
if (isnan(den_val))
num_val = den_val = 1.f;
accum_inner_num += num_val;
accum_inner_den += den_val;
}
accum_num += accum_inner_num;
accum_den += accum_inner_den;
}
num[0] = accum_num;
den[0] = accum_den;
}
static void vif_xx_yy_xy(const float *x, const float *y, float *xx, float *yy,
float *xy, int w, int h)
{
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
float xval = x[j];
float yval = y[j];
float xxval = xval * xval;
float yyval = yval * yval;
float xyval = xval * yval;
xx[j] = xxval;
yy[j] = yyval;
xy[j] = xyval;
}
xx += w;
yy += w;
xy += w;
x += w;
y += w;
}
}
static int vif_filter1d(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ThreadData *td = arg;
const float *filter = td->filter;
const float *src = td->src;
float *dst = td->dst;
int w = td->w;
int h = td->h;
int src_stride = td->src_stride;
int dst_stride = td->dst_stride;
int filt_w = td->filter_width;
float *temp = td->temp[jobnr];
const int slice_start = (h * jobnr) / nb_jobs;
const int slice_end = (h * (jobnr+1)) / nb_jobs;
for (int i = slice_start; i < slice_end; i++) {
/** Vertical pass. */
for (int j = 0; j < w; j++) {
float sum = 0.f;
if (i >= filt_w / 2 && i < h - filt_w / 2 - 1) {
for (int filt_i = 0; filt_i < filt_w; filt_i++) {
const float filt_coeff = filter[filt_i];
float img_coeff;
int ii = i - filt_w / 2 + filt_i;
img_coeff = src[ii * src_stride + j];
sum += filt_coeff * img_coeff;
}
} else {
for (int filt_i = 0; filt_i < filt_w; filt_i++) {
const float filt_coeff = filter[filt_i];
int ii = i - filt_w / 2 + filt_i;
float img_coeff;
ii = ii < 0 ? -ii : (ii >= h ? 2 * h - ii - 1 : ii);
img_coeff = src[ii * src_stride + j];
sum += filt_coeff * img_coeff;
}
}
temp[j] = sum;
}
/** Horizontal pass. */
for (int j = 0; j < w; j++) {
float sum = 0.f;
if (j >= filt_w / 2 && j < w - filt_w / 2 - 1) {
for (int filt_j = 0; filt_j < filt_w; filt_j++) {
const float filt_coeff = filter[filt_j];
int jj = j - filt_w / 2 + filt_j;
float img_coeff;
img_coeff = temp[jj];
sum += filt_coeff * img_coeff;
}
} else {
for (int filt_j = 0; filt_j < filt_w; filt_j++) {
const float filt_coeff = filter[filt_j];
int jj = j - filt_w / 2 + filt_j;
float img_coeff;
jj = jj < 0 ? -jj : (jj >= w ? 2 * w - jj - 1 : jj);
img_coeff = temp[jj];
sum += filt_coeff * img_coeff;
}
}
dst[i * dst_stride + j] = sum;
}
}
return 0;
}
static int compute_vif2(AVFilterContext *ctx,
const float *ref, const float *main, int w, int h,
int ref_stride, int main_stride, float *score,
float *const data_buf[NUM_DATA_BUFS], float **temp,
int gnb_threads)
{
ThreadData td;
float *ref_scale = data_buf[0];
float *main_scale = data_buf[1];
float *ref_sq = data_buf[2];
float *main_sq = data_buf[3];
float *ref_main = data_buf[4];
float *mu1 = data_buf[5];
float *mu2 = data_buf[6];
float *mu1_sq = data_buf[7];
float *mu2_sq = data_buf[8];
float *mu1_mu2 = data_buf[9];
float *ref_sq_filt = data_buf[10];
float *main_sq_filt = data_buf[11];
float *ref_main_filt = data_buf[12];
const float *curr_ref_scale = ref;
const float *curr_main_scale = main;
int curr_ref_stride = ref_stride;
int curr_main_stride = main_stride;
float num = 0.f;
float den = 0.f;
for (int scale = 0; scale < 4; scale++) {
const float *filter = vif_filter1d_table[scale];
int filter_width = vif_filter1d_width1[scale];
const int nb_threads = FFMIN(h, gnb_threads);
int buf_valid_w = w;
int buf_valid_h = h;
td.filter = filter;
td.filter_width = filter_width;
if (scale > 0) {
td.src = curr_ref_scale;
td.dst = mu1;
td.w = w;
td.h = h;
td.src_stride = curr_ref_stride;
td.dst_stride = w;
td.temp = temp;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
td.src = curr_main_scale;
td.dst = mu2;
td.src_stride = curr_main_stride;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
vif_dec2(mu1, ref_scale, buf_valid_w, buf_valid_h, w, w);
vif_dec2(mu2, main_scale, buf_valid_w, buf_valid_h, w, w);
w = buf_valid_w / 2;
h = buf_valid_h / 2;
buf_valid_w = w;
buf_valid_h = h;
curr_ref_scale = ref_scale;
curr_main_scale = main_scale;
curr_ref_stride = w;
curr_main_stride = w;
}
td.src = curr_ref_scale;
td.dst = mu1;
td.w = w;
td.h = h;
td.src_stride = curr_ref_stride;
td.dst_stride = w;
td.temp = temp;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
td.src = curr_main_scale;
td.dst = mu2;
td.src_stride = curr_main_stride;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
vif_xx_yy_xy(mu1, mu2, mu1_sq, mu2_sq, mu1_mu2, w, h);
vif_xx_yy_xy(curr_ref_scale, curr_main_scale, ref_sq, main_sq, ref_main, w, h);
td.src = ref_sq;
td.dst = ref_sq_filt;
td.src_stride = w;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
td.src = main_sq;
td.dst = main_sq_filt;
td.src_stride = w;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
td.src = ref_main;
td.dst = ref_main_filt;
ff_filter_execute(ctx, vif_filter1d, &td, NULL, nb_threads);
vif_statistic(mu1_sq, mu2_sq, mu1_mu2, ref_sq_filt, main_sq_filt,
ref_main_filt, &num, &den, w, h);
score[scale] = den <= FLT_EPSILON ? 1.f : num / den;
}
return 0;
}
#define offset_fn(type, bits) \
static void offset_##bits##bit(VIFContext *s, \
const AVFrame *ref, \
AVFrame *main, int stride)\
{ \
int w = s->width; \
int h = s->height; \
\
int ref_stride = ref->linesize[0]; \
int main_stride = main->linesize[0]; \
\
const type *ref_ptr = (const type *) ref->data[0]; \
const type *main_ptr = (const type *) main->data[0]; \
\
const float factor = s->factor; \
\
float *ref_ptr_data = s->ref_data; \
float *main_ptr_data = s->main_data; \
\
for (int i = 0; i < h; i++) { \
for (int j = 0; j < w; j++) { \
ref_ptr_data[j] = ref_ptr[j] * factor - 128.f; \
main_ptr_data[j] = main_ptr[j] * factor - 128.f; \
} \
ref_ptr += ref_stride / sizeof(type); \
ref_ptr_data += w; \
main_ptr += main_stride / sizeof(type); \
main_ptr_data += w; \
} \
}
offset_fn(uint8_t, 8)
offset_fn(uint16_t, 16)
static void set_meta(AVDictionary **metadata, const char *key, float d)
{
char value[257];
snprintf(value, sizeof(value), "%f", d);
av_dict_set(metadata, key, value, 0);
}
static AVFrame *do_vif(AVFilterContext *ctx, AVFrame *main, const AVFrame *ref)
{
VIFContext *s = ctx->priv;
AVDictionary **metadata = &main->metadata;
float score[4];
s->factor = 1.f / (1 << (s->desc->comp[0].depth - 8));
if (s->desc->comp[0].depth <= 8) {
offset_8bit(s, ref, main, s->width);
} else {
offset_16bit(s, ref, main, s->width);
}
compute_vif2(ctx, s->ref_data, s->main_data,
s->width, s->height, s->width, s->width,
score, s->data_buf, s->temp, s->nb_threads);
set_meta(metadata, "lavfi.vif.scale.0", score[0]);
set_meta(metadata, "lavfi.vif.scale.1", score[1]);
set_meta(metadata, "lavfi.vif.scale.2", score[2]);
set_meta(metadata, "lavfi.vif.scale.3", score[3]);
for (int i = 0; i < 4; i++) {
s->vif_min[i] = FFMIN(s->vif_min[i], score[i]);
s->vif_max[i] = FFMAX(s->vif_max[i], score[i]);
s->vif_sum[i] += score[i];
}
s->nb_frames++;
return main;
}
static const enum AVPixelFormat pix_fmts[] = {
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_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
#define PF(suf) AV_PIX_FMT_YUV420##suf, AV_PIX_FMT_YUV422##suf, AV_PIX_FMT_YUV444##suf
PF(P9), PF(P10), PF(P12), PF(P14), PF(P16),
AV_PIX_FMT_NONE
};
static int config_input_ref(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
VIFContext *s = ctx->priv;
if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
ctx->inputs[0]->h != ctx->inputs[1]->h) {
av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
return AVERROR(EINVAL);
}
s->desc = av_pix_fmt_desc_get(inlink->format);
s->width = ctx->inputs[0]->w;
s->height = ctx->inputs[0]->h;
s->nb_threads = ff_filter_get_nb_threads(ctx);
for (int i = 0; i < 4; i++) {
s->vif_min[i] = DBL_MAX;
s->vif_max[i] = -DBL_MAX;
}
for (int i = 0; i < NUM_DATA_BUFS; i++) {
if (!(s->data_buf[i] = av_calloc(s->width, s->height * sizeof(float))))
return AVERROR(ENOMEM);
}
if (!(s->ref_data = av_calloc(s->width, s->height * sizeof(float))))
return AVERROR(ENOMEM);
if (!(s->main_data = av_calloc(s->width, s->height * sizeof(float))))
return AVERROR(ENOMEM);
if (!(s->temp = av_calloc(s->nb_threads, sizeof(s->temp[0]))))
return AVERROR(ENOMEM);
for (int i = 0; i < s->nb_threads; i++) {
if (!(s->temp[i] = av_calloc(s->width, sizeof(float))))
return AVERROR(ENOMEM);
}
return 0;
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
VIFContext *s = fs->opaque;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out_frame, *main_frame = NULL, *ref_frame = NULL;
int ret;
ret = ff_framesync_dualinput_get(fs, &main_frame, &ref_frame);
if (ret < 0)
return ret;
if (ctx->is_disabled || !ref_frame) {
out_frame = main_frame;
} else {
out_frame = do_vif(ctx, main_frame, ref_frame);
}
out_frame->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
return ff_filter_frame(outlink, out_frame);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
VIFContext *s = ctx->priv;
AVFilterLink *mainlink = ctx->inputs[0];
FFFrameSyncIn *in;
int ret;
outlink->w = mainlink->w;
outlink->h = mainlink->h;
outlink->time_base = mainlink->time_base;
outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
outlink->frame_rate = mainlink->frame_rate;
if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
return ret;
in = s->fs.in;
in[0].time_base = mainlink->time_base;
in[1].time_base = ctx->inputs[1]->time_base;
in[0].sync = 2;
in[0].before = EXT_STOP;
in[0].after = EXT_STOP;
in[1].sync = 1;
in[1].before = EXT_STOP;
in[1].after = EXT_STOP;
s->fs.opaque = s;
s->fs.on_event = process_frame;
return ff_framesync_configure(&s->fs);
}
static int activate(AVFilterContext *ctx)
{
VIFContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static av_cold void uninit(AVFilterContext *ctx)
{
VIFContext *s = ctx->priv;
if (s->nb_frames > 0) {
for (int i = 0; i < 4; i++)
av_log(ctx, AV_LOG_INFO, "VIF scale=%d average:%f min:%f: max:%f\n",
i, s->vif_sum[i] / s->nb_frames, s->vif_min[i], s->vif_max[i]);
}
for (int i = 0; i < NUM_DATA_BUFS; i++)
av_freep(&s->data_buf[i]);
av_freep(&s->ref_data);
av_freep(&s->main_data);
for (int i = 0; i < s->nb_threads && s->temp; i++)
av_freep(&s->temp[i]);
av_freep(&s->temp);
ff_framesync_uninit(&s->fs);
}
static const AVFilterPad vif_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
},{
.name = "reference",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_ref,
},
};
static const AVFilterPad vif_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_vif = {
.name = "vif",
.description = NULL_IF_CONFIG_SMALL("Calculate the VIF between two video streams."),
.preinit = vif_framesync_preinit,
.uninit = uninit,
.priv_size = sizeof(VIFContext),
.priv_class = &vif_class,
.activate = activate,
FILTER_INPUTS(vif_inputs),
FILTER_OUTPUTS(vif_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_METADATA_ONLY,
};
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