Adds the PU21 encoding filter for high dynamic range images and video quality
assessment
Mantiuk, R., & Azimi, M. PU21: A novel perceptually uniform encoding for
adapting existing quality metrics for HDR
https://github.com/gfxdisp/pu21
Signed-off-by: Rajiv Harlalka <rajivharlalka...@gmail.com>
---
Changelog | 1 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 4 +-
libavfilter/vf_pu21.c | 210 +++++++++++++++++++++++++++++++++++++++
5 files changed, 215 insertions(+), 2 deletions(-)
create mode 100644 libavfilter/vf_pu21.c
diff --git a/Changelog b/Changelog
index 571b27ad98..552aa6028a 100644
--- a/Changelog
+++ b/Changelog
@@ -18,6 +18,7 @@ version <next>:
- D3D12VA HEVC encoder
- Cropping metadata parsing and writing in Matroska and MP4/MOV de/muxers
- Intel QSV-accelerated VVC decoding
+- Addition of vf_pu21 encoding filter
version 7.0:
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 63088e9286..102315f5bf 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -121,6 +121,7 @@ OBJS-$(CONFIG_AXCORRELATE_FILTER) +=
af_axcorrelate.o
OBJS-$(CONFIG_AZMQ_FILTER) += f_zmq.o
OBJS-$(CONFIG_BANDPASS_FILTER) += af_biquads.o
OBJS-$(CONFIG_BANDREJECT_FILTER) += af_biquads.o
+OBJS-$(CONFIG_PU21_FILTER) += vf_pu21.o
OBJS-$(CONFIG_BASS_FILTER) += af_biquads.o
OBJS-$(CONFIG_BIQUAD_FILTER) += af_biquads.o
OBJS-$(CONFIG_BS2B_FILTER) += af_bs2b.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 63600e9b58..ced076626c 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -231,6 +231,7 @@ extern const AVFilter ff_vf_convolution_opencl;
extern const AVFilter ff_vf_convolve;
extern const AVFilter ff_vf_copy;
extern const AVFilter ff_vf_coreimage;
+extern const AVFilter ff_vf_pu21;
extern const AVFilter ff_vf_corr;
extern const AVFilter ff_vf_cover_rect;
extern const AVFilter ff_vf_crop;
diff --git a/libavfilter/version.h b/libavfilter/version.h
index d8cd8a2cfb..7e0eb9af97 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -31,8 +31,8 @@
#include "version_major.h"
-#define LIBAVFILTER_VERSION_MINOR 2
-#define LIBAVFILTER_VERSION_MICRO 102
+#define LIBAVFILTER_VERSION_MINOR 3
+#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_pu21.c b/libavfilter/vf_pu21.c
new file mode 100644
index 0000000000..c3b56f9c1b
--- /dev/null
+++ b/libavfilter/vf_pu21.c
@@ -0,0 +1,210 @@
+
+#include "libavfilter/avfilter.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/mem.h"
+#include "libavutil/imgutils.h"
+#include "libavfilter/formats.h"
+#include "libavutil/internal.h"
+#include "video.h"
+
+static enum pu21_mode {
+ BANDING,
+ BANDING_GLARE,
+ PEAKS,
+ PEAKS_GLARE
+};
+
+typedef struct PU21Context {
+ const AVClass* class;
+ double L_min, L_max;
+ int multiplier;
+ int mode;
+
+ int depth;
+ int nb_planes;
+} PU21Context;
+
+const float pu21_params[4][7] = {
+ // Reference: "PU21: A novel perceptually uniform encoding for adapting
existing quality metrics for HDR"
+ // Rafał K. Mantiuk and M. Azimi, Picture Coding Symposium 2021
+ // https://github.com/gfxdisp/pu21
+ {1.070275272f, 0.4088273932f, 0.153224308f, 0.2520326168f, 1.063512885f,
1.14115047f, 521.4527484f}, // BANDING
+ {0.353487901f, 0.3734658629f, 8.277049286e-05f, 0.9062562627f,
0.09150303166f, 0.9099517204f, 596.3148142f}, // BANDING_GLARE
+ {1.043882782f, 0.6459495343f, 0.3194584211f, 0.374025247f, 1.114783422f,
1.095360363f, 384.9217577f}, // PEAKS
+ {816.885024f, 1479.463946f, 0.001253215609f, 0.9329636822f, 0.06746643971f,
1.573435413f, 419.6006374f} // PEAKS_GLARE
+};
+
+
+#define OFFSET(x) offsetof(PU21Context, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption pu21_options[] = {
+ { "L_min", "Set the minimum luminance value", OFFSET(L_min),
AV_OPT_TYPE_DOUBLE, {.dbl = 0.005}, 0.005, 10000, FLAGS },
+ { "L_max", "Set the maximum luminance value", OFFSET(L_max),
AV_OPT_TYPE_DOUBLE, {.dbl = 10000}, 0.005, 10000, FLAGS },
+ { "multiplier", "Set the parameters for the encoding", OFFSET(multiplier),
AV_OPT_TYPE_INT, {.i64 = 1}, 1, 10000, FLAGS},
+ { "mode", "Set the mode of the PU21 encoding", OFFSET(mode),
AV_OPT_TYPE_INT, {.i64 = BANDING_GLARE}, BANDING, PEAKS_GLARE, FLAGS},
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(pu21);
+
+static av_cold int pu21_init(AVFilterContext* ctx) {
+ PU21Context* pu21 = ctx->priv;
+
+ pu21->L_max = 300;
+ pu21->L_min = 0.005;
+ pu21->multiplier = 1;
+ pu21->mode = BANDING_GLARE;
+ return 0;
+}
+
+static float apply_pu21(float pixel_val, PU21Context* pu21) {
+ float Y, V;
+ Y = pixel_val * (pu21->multiplier);
+ V = fmax(pu21_params[pu21->mode][6] * (pow((pu21_params[pu21->mode][0] +
pu21_params[pu21->mode][1] * pow(Y, pu21_params[pu21->mode][3])) / (1 +
pu21_params[pu21->mode][2] * pow(Y, pu21_params[pu21->mode][3])),
pu21_params[pu21->mode][4]) - pu21_params[pu21->mode][5]), 0);
+ return V;
+}
+
+static void pu21_encode8(AVFilterContext* ctx, AVFrame* in, AVFrame* out) {
+ PU21Context* pu21 = ctx->priv;
+ const int height = in->height;
+ const int width = in->width;
+
+ int plane;
+ for (plane = 0; plane < pu21->nb_planes; plane++) {
+ const uint8_t* src8 = in->data[plane];
+ uint8_t* dst8 = out->data[plane];
+
+ int linesize = in->linesize[plane];
+
+ uint8_t pixel_val;
+ for (int y = 0; y < height; y++) {
+ for (int x = 0; x < width; x++) {
+ pixel_val = src8[y * linesize + x];
+ dst8[y * linesize + x] = (uint8_t)apply_pu21(pixel_val, pu21);
+ }
+ }
+ }
+}
+
+static void pu21_encode16(AVFilterContext* ctx, AVFrame* in, AVFrame* out) {
+ PU21Context* pu21 = ctx->priv;
+ const int height = in->height;
+ const int width = in->width;
+
+ int plane;
+ for (plane = 0; plane < pu21->nb_planes; plane++) {
+ const uint16_t* src16 = (uint16_t*)in->data[plane];
+ uint16_t* dst16 = (uint16_t*)out->data[plane];
+
+ int linesize = in->linesize[plane] / 2;
+
+ uint16_t pixel_val;
+ for (int y = 0; y < height; y++) {
+ for (int x = 0; x < width; x++) {
+ pixel_val = src16[y * linesize + x];
+ dst16[y * linesize + x] = (uint16_t)apply_pu21(pixel_val, pu21);
+ }
+ }
+ }
+}
+
+static void pu21_encode32(AVFilterContext* ctx, AVFrame* in, AVFrame* out) {
+ PU21Context* pu21 = ctx->priv;
+ const int height = in->height;
+ const int width = in->width;
+
+ int plane;
+ for (plane = 0; plane < pu21->nb_planes; plane++) {
+ const float* src32 = (float*)in->data[plane];
+ float* dst32 = (float*)out->data[plane];
+
+ int linesize = in->linesize[plane] / 4;
+
+ float pixel_val;
+ for (int y = 0; y < height; y++) {
+ for (int x = 0; x < width; x++) {
+ pixel_val = src32[y * linesize + x];
+ dst32[y * linesize + x] = (float)apply_pu21(pixel_val, pu21);
+ }
+ }
+ }
+}
+
+static int filter_frame(AVFilterLink* inlink, AVFrame* input) {
+ AVFilterContext* ctx = inlink->dst;
+ PU21Context* pu21 = ctx->priv;
+
+ AVFilterLink* outlink = ctx->outputs[0];
+ AVFrame* out;
+
+ if (av_frame_is_writable(input)) {
+ out = input;
+ }
+ else {
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&input);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out, input);
+ }
+
+ if (pu21->depth <= 8) {
+ pu21_encode8(ctx, input, out);
+ }
+ else if (pu21->depth <= 16) {
+ pu21_encode16(ctx, input, out);
+ }
+ else {
+ pu21_encode32(ctx, input, out);
+ }
+
+ if (out != input)
+ av_frame_free(&input);
+ return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext* ctx) {
+ PU21Context* s = ctx->priv;
+}
+
+static int config_input(AVFilterLink* inlink) {
+ const AVPixFmtDescriptor* desc = av_pix_fmt_desc_get(inlink->format);
+ PU21Context* s = inlink->dst->priv;
+
+ uninit(inlink->dst);
+
+ s->depth = desc->comp[0].depth;
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ return 0;
+}
+
+static const AVFilterPad pu21_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ }
+};
+
+static const AVFilterPad pu21_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ }
+};
+
+const AVFilter ff_vf_pu21 = {
+ .name = "pu21",
+ .description = NULL_IF_CONFIG_SMALL("Convert HDR linear values to PU
values using PU21 transform"),
+ .priv_size = sizeof(PU21Context),
+ .init = pu21_init,
+ .uninit = uninit,
+ FILTER_INPUTS(pu21_inputs),
+ FILTER_OUTPUTS(pu21_outputs),
+ .priv_class = &pu21_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
--
2.25.1
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