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FFmpeg/libavfilter/vf_dctdnoiz.c
Ganesh Ajjanagadde 8507b98c10 avfilter,swresample,swscale: use fabs, fabsf instead of FFABS 
It is well known that fabs and fabsf are at least as fast and sometimes
faster than the FFABS macro, at least on the gcc+glibc combination.
For instance, see the reference:
http://patchwork.sourceware.org/patch/6735/.
This was a patch to glibc in order to remove their usages of a macro.

The reason essentially boils down to fabs using the __builtin_fabs of
the compiler, while FFABS needs to infer to not use a branch and to
simply change the sign bit. Usually the inference works, but sometimes
it does not. This may be easily checked by looking at the asm.

This also has the added benefit of reducing macro usage, which has
problems with side-effects.

Note that avcodec is not handled here, as it is huge and
most things there are integer arithmetic anyway.

Tested with FATE.

Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-10-22 16:13:26 -04:00

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/*
* Copyright (c) 2013-2014 Clément Bœsch
*
* 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
*/
/**
* A simple, relatively efficient and slow DCT image denoiser.
*
* @see http://www.ipol.im/pub/art/2011/ys-dct/
*
* The DCT factorization used is based on "Fast and numerically stable
* algorithms for discrete cosine transforms" from Gerlind Plonkaa & Manfred
* Tasche (DOI: 10.1016/j.laa.2004.07.015).
*/
#include "libavutil/avassert.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "internal.h"
static const char *const var_names[] = { "c", NULL };
enum { VAR_C, VAR_VARS_NB };
#define MAX_THREADS 8
typedef struct DCTdnoizContext {
const AVClass *class;
/* coefficient factor expression */
char *expr_str;
AVExpr *expr[MAX_THREADS];
double var_values[MAX_THREADS][VAR_VARS_NB];
int nb_threads;
int pr_width, pr_height; // width and height to process
float sigma; // used when no expression are st
float th; // threshold (3*sigma)
float *cbuf[2][3]; // two planar rgb color buffers
float *slices[MAX_THREADS]; // slices buffers (1 slice buffer per thread)
float *weights; // dct coeff are cumulated with overlapping; these values are used for averaging
int p_linesize; // line sizes for color and weights
int overlap; // number of block overlapping pixels
int step; // block step increment (blocksize - overlap)
int n; // 1<<n is the block size
int bsize; // block size, 1<<n
void (*filter_freq_func)(struct DCTdnoizContext *s,
const float *src, int src_linesize,
float *dst, int dst_linesize,
int thread_id);
void (*color_decorrelation)(float **dst, int dst_linesize,
const uint8_t *src, int src_linesize,
int w, int h);
void (*color_correlation)(uint8_t *dst, int dst_linesize,
float **src, int src_linesize,
int w, int h);
} DCTdnoizContext;
#define MIN_NBITS 3 /* blocksize = 1<<3 = 8 */
#define MAX_NBITS 4 /* blocksize = 1<<4 = 16 */
#define DEFAULT_NBITS 3
#define OFFSET(x) offsetof(DCTdnoizContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption dctdnoiz_options[] = {
{ "sigma", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
{ "s", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
{ "overlap", "set number of block overlapping pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=-1}, -1, (1<<MAX_NBITS)-1, .flags = FLAGS },
{ "expr", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "e", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "n", "set the block size, expressed in bits", OFFSET(n), AV_OPT_TYPE_INT, {.i64=DEFAULT_NBITS}, MIN_NBITS, MAX_NBITS, .flags = FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(dctdnoiz);
static void av_always_inline fdct8_1d(float *dst, const float *src,
int dst_stridea, int dst_strideb,
int src_stridea, int src_strideb)
{
int i;
for (i = 0; i < 8; i++) {
const float x00 = src[0*src_stridea] + src[7*src_stridea];
const float x01 = src[1*src_stridea] + src[6*src_stridea];
const float x02 = src[2*src_stridea] + src[5*src_stridea];
const float x03 = src[3*src_stridea] + src[4*src_stridea];
const float x04 = src[0*src_stridea] - src[7*src_stridea];
const float x05 = src[1*src_stridea] - src[6*src_stridea];
const float x06 = src[2*src_stridea] - src[5*src_stridea];
const float x07 = src[3*src_stridea] - src[4*src_stridea];
const float x08 = x00 + x03;
const float x09 = x01 + x02;
const float x0a = x00 - x03;
const float x0b = x01 - x02;
const float x0c = 1.38703984532215f*x04 + 0.275899379282943f*x07;
const float x0d = 1.17587560241936f*x05 + 0.785694958387102f*x06;
const float x0e = -0.785694958387102f*x05 + 1.17587560241936f*x06;
const float x0f = 0.275899379282943f*x04 - 1.38703984532215f*x07;
const float x10 = 0.353553390593274f * (x0c - x0d);
const float x11 = 0.353553390593274f * (x0e - x0f);
dst[0*dst_stridea] = 0.353553390593274f * (x08 + x09);
dst[1*dst_stridea] = 0.353553390593274f * (x0c + x0d);
dst[2*dst_stridea] = 0.461939766255643f*x0a + 0.191341716182545f*x0b;
dst[3*dst_stridea] = 0.707106781186547f * (x10 - x11);
dst[4*dst_stridea] = 0.353553390593274f * (x08 - x09);
dst[5*dst_stridea] = 0.707106781186547f * (x10 + x11);
dst[6*dst_stridea] = 0.191341716182545f*x0a - 0.461939766255643f*x0b;
dst[7*dst_stridea] = 0.353553390593274f * (x0e + x0f);
dst += dst_strideb;
src += src_strideb;
}
}
static void av_always_inline idct8_1d(float *dst, const float *src,
int dst_stridea, int dst_strideb,
int src_stridea, int src_strideb,
int add)
{
int i;
for (i = 0; i < 8; i++) {
const float x00 = 1.4142135623731f *src[0*src_stridea];
const float x01 = 1.38703984532215f *src[1*src_stridea] + 0.275899379282943f*src[7*src_stridea];
const float x02 = 1.30656296487638f *src[2*src_stridea] + 0.541196100146197f*src[6*src_stridea];
const float x03 = 1.17587560241936f *src[3*src_stridea] + 0.785694958387102f*src[5*src_stridea];
const float x04 = 1.4142135623731f *src[4*src_stridea];
const float x05 = -0.785694958387102f*src[3*src_stridea] + 1.17587560241936f*src[5*src_stridea];
const float x06 = 0.541196100146197f*src[2*src_stridea] - 1.30656296487638f*src[6*src_stridea];
const float x07 = -0.275899379282943f*src[1*src_stridea] + 1.38703984532215f*src[7*src_stridea];
const float x09 = x00 + x04;
const float x0a = x01 + x03;
const float x0b = 1.4142135623731f*x02;
const float x0c = x00 - x04;
const float x0d = x01 - x03;
const float x0e = 0.353553390593274f * (x09 - x0b);
const float x0f = 0.353553390593274f * (x0c + x0d);
const float x10 = 0.353553390593274f * (x0c - x0d);
const float x11 = 1.4142135623731f*x06;
const float x12 = x05 + x07;
const float x13 = x05 - x07;
const float x14 = 0.353553390593274f * (x11 + x12);
const float x15 = 0.353553390593274f * (x11 - x12);
const float x16 = 0.5f*x13;
dst[0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.25f * (x09 + x0b) + 0.353553390593274f*x0a;
dst[1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x0f + x15);
dst[2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x0f - x15);
dst[3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x0e + x16);
dst[4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x0e - x16);
dst[5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x10 - x14);
dst[6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x10 + x14);
dst[7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.25f * (x09 + x0b) - 0.353553390593274f*x0a;
dst += dst_strideb;
src += src_strideb;
}
}
static void av_always_inline fdct16_1d(float *dst, const float *src,
int dst_stridea, int dst_strideb,
int src_stridea, int src_strideb)
{
int i;
for (i = 0; i < 16; i++) {
const float x00 = src[ 0*src_stridea] + src[15*src_stridea];
const float x01 = src[ 1*src_stridea] + src[14*src_stridea];
const float x02 = src[ 2*src_stridea] + src[13*src_stridea];
const float x03 = src[ 3*src_stridea] + src[12*src_stridea];
const float x04 = src[ 4*src_stridea] + src[11*src_stridea];
const float x05 = src[ 5*src_stridea] + src[10*src_stridea];
const float x06 = src[ 6*src_stridea] + src[ 9*src_stridea];
const float x07 = src[ 7*src_stridea] + src[ 8*src_stridea];
const float x08 = src[ 0*src_stridea] - src[15*src_stridea];
const float x09 = src[ 1*src_stridea] - src[14*src_stridea];
const float x0a = src[ 2*src_stridea] - src[13*src_stridea];
const float x0b = src[ 3*src_stridea] - src[12*src_stridea];
const float x0c = src[ 4*src_stridea] - src[11*src_stridea];
const float x0d = src[ 5*src_stridea] - src[10*src_stridea];
const float x0e = src[ 6*src_stridea] - src[ 9*src_stridea];
const float x0f = src[ 7*src_stridea] - src[ 8*src_stridea];
const float x10 = x00 + x07;
const float x11 = x01 + x06;
const float x12 = x02 + x05;
const float x13 = x03 + x04;
const float x14 = x00 - x07;
const float x15 = x01 - x06;
const float x16 = x02 - x05;
const float x17 = x03 - x04;
const float x18 = x10 + x13;
const float x19 = x11 + x12;
const float x1a = x10 - x13;
const float x1b = x11 - x12;
const float x1c = 1.38703984532215f*x14 + 0.275899379282943f*x17;
const float x1d = 1.17587560241936f*x15 + 0.785694958387102f*x16;
const float x1e = -0.785694958387102f*x15 + 1.17587560241936f *x16;
const float x1f = 0.275899379282943f*x14 - 1.38703984532215f *x17;
const float x20 = 0.25f * (x1c - x1d);
const float x21 = 0.25f * (x1e - x1f);
const float x22 = 1.40740373752638f *x08 + 0.138617169199091f*x0f;
const float x23 = 1.35331800117435f *x09 + 0.410524527522357f*x0e;
const float x24 = 1.24722501298667f *x0a + 0.666655658477747f*x0d;
const float x25 = 1.09320186700176f *x0b + 0.897167586342636f*x0c;
const float x26 = -0.897167586342636f*x0b + 1.09320186700176f *x0c;
const float x27 = 0.666655658477747f*x0a - 1.24722501298667f *x0d;
const float x28 = -0.410524527522357f*x09 + 1.35331800117435f *x0e;
const float x29 = 0.138617169199091f*x08 - 1.40740373752638f *x0f;
const float x2a = x22 + x25;
const float x2b = x23 + x24;
const float x2c = x22 - x25;
const float x2d = x23 - x24;
const float x2e = 0.25f * (x2a - x2b);
const float x2f = 0.326640741219094f*x2c + 0.135299025036549f*x2d;
const float x30 = 0.135299025036549f*x2c - 0.326640741219094f*x2d;
const float x31 = x26 + x29;
const float x32 = x27 + x28;
const float x33 = x26 - x29;
const float x34 = x27 - x28;
const float x35 = 0.25f * (x31 - x32);
const float x36 = 0.326640741219094f*x33 + 0.135299025036549f*x34;
const float x37 = 0.135299025036549f*x33 - 0.326640741219094f*x34;
dst[ 0*dst_stridea] = 0.25f * (x18 + x19);
dst[ 1*dst_stridea] = 0.25f * (x2a + x2b);
dst[ 2*dst_stridea] = 0.25f * (x1c + x1d);
dst[ 3*dst_stridea] = 0.707106781186547f * (x2f - x37);
dst[ 4*dst_stridea] = 0.326640741219094f*x1a + 0.135299025036549f*x1b;
dst[ 5*dst_stridea] = 0.707106781186547f * (x2f + x37);
dst[ 6*dst_stridea] = 0.707106781186547f * (x20 - x21);
dst[ 7*dst_stridea] = 0.707106781186547f * (x2e + x35);
dst[ 8*dst_stridea] = 0.25f * (x18 - x19);
dst[ 9*dst_stridea] = 0.707106781186547f * (x2e - x35);
dst[10*dst_stridea] = 0.707106781186547f * (x20 + x21);
dst[11*dst_stridea] = 0.707106781186547f * (x30 - x36);
dst[12*dst_stridea] = 0.135299025036549f*x1a - 0.326640741219094f*x1b;
dst[13*dst_stridea] = 0.707106781186547f * (x30 + x36);
dst[14*dst_stridea] = 0.25f * (x1e + x1f);
dst[15*dst_stridea] = 0.25f * (x31 + x32);
dst += dst_strideb;
src += src_strideb;
}
}
static void av_always_inline idct16_1d(float *dst, const float *src,
int dst_stridea, int dst_strideb,
int src_stridea, int src_strideb,
int add)
{
int i;
for (i = 0; i < 16; i++) {
const float x00 = 1.4142135623731f *src[ 0*src_stridea];
const float x01 = 1.40740373752638f *src[ 1*src_stridea] + 0.138617169199091f*src[15*src_stridea];
const float x02 = 1.38703984532215f *src[ 2*src_stridea] + 0.275899379282943f*src[14*src_stridea];
const float x03 = 1.35331800117435f *src[ 3*src_stridea] + 0.410524527522357f*src[13*src_stridea];
const float x04 = 1.30656296487638f *src[ 4*src_stridea] + 0.541196100146197f*src[12*src_stridea];
const float x05 = 1.24722501298667f *src[ 5*src_stridea] + 0.666655658477747f*src[11*src_stridea];
const float x06 = 1.17587560241936f *src[ 6*src_stridea] + 0.785694958387102f*src[10*src_stridea];
const float x07 = 1.09320186700176f *src[ 7*src_stridea] + 0.897167586342636f*src[ 9*src_stridea];
const float x08 = 1.4142135623731f *src[ 8*src_stridea];
const float x09 = -0.897167586342636f*src[ 7*src_stridea] + 1.09320186700176f*src[ 9*src_stridea];
const float x0a = 0.785694958387102f*src[ 6*src_stridea] - 1.17587560241936f*src[10*src_stridea];
const float x0b = -0.666655658477747f*src[ 5*src_stridea] + 1.24722501298667f*src[11*src_stridea];
const float x0c = 0.541196100146197f*src[ 4*src_stridea] - 1.30656296487638f*src[12*src_stridea];
const float x0d = -0.410524527522357f*src[ 3*src_stridea] + 1.35331800117435f*src[13*src_stridea];
const float x0e = 0.275899379282943f*src[ 2*src_stridea] - 1.38703984532215f*src[14*src_stridea];
const float x0f = -0.138617169199091f*src[ 1*src_stridea] + 1.40740373752638f*src[15*src_stridea];
const float x12 = x00 + x08;
const float x13 = x01 + x07;
const float x14 = x02 + x06;
const float x15 = x03 + x05;
const float x16 = 1.4142135623731f*x04;
const float x17 = x00 - x08;
const float x18 = x01 - x07;
const float x19 = x02 - x06;
const float x1a = x03 - x05;
const float x1d = x12 + x16;
const float x1e = x13 + x15;
const float x1f = 1.4142135623731f*x14;
const float x20 = x12 - x16;
const float x21 = x13 - x15;
const float x22 = 0.25f * (x1d - x1f);
const float x23 = 0.25f * (x20 + x21);
const float x24 = 0.25f * (x20 - x21);
const float x25 = 1.4142135623731f*x17;
const float x26 = 1.30656296487638f*x18 + 0.541196100146197f*x1a;
const float x27 = 1.4142135623731f*x19;
const float x28 = -0.541196100146197f*x18 + 1.30656296487638f*x1a;
const float x29 = 0.176776695296637f * (x25 + x27) + 0.25f*x26;
const float x2a = 0.25f * (x25 - x27);
const float x2b = 0.176776695296637f * (x25 + x27) - 0.25f*x26;
const float x2c = 0.353553390593274f*x28;
const float x1b = 0.707106781186547f * (x2a - x2c);
const float x1c = 0.707106781186547f * (x2a + x2c);
const float x2d = 1.4142135623731f*x0c;
const float x2e = x0b + x0d;
const float x2f = x0a + x0e;
const float x30 = x09 + x0f;
const float x31 = x09 - x0f;
const float x32 = x0a - x0e;
const float x33 = x0b - x0d;
const float x37 = 1.4142135623731f*x2d;
const float x38 = 1.30656296487638f*x2e + 0.541196100146197f*x30;
const float x39 = 1.4142135623731f*x2f;
const float x3a = -0.541196100146197f*x2e + 1.30656296487638f*x30;
const float x3b = 0.176776695296637f * (x37 + x39) + 0.25f*x38;
const float x3c = 0.25f * (x37 - x39);
const float x3d = 0.176776695296637f * (x37 + x39) - 0.25f*x38;
const float x3e = 0.353553390593274f*x3a;
const float x34 = 0.707106781186547f * (x3c - x3e);
const float x35 = 0.707106781186547f * (x3c + x3e);
const float x3f = 1.4142135623731f*x32;
const float x40 = x31 + x33;
const float x41 = x31 - x33;
const float x42 = 0.25f * (x3f + x40);
const float x43 = 0.25f * (x3f - x40);
const float x44 = 0.353553390593274f*x41;
dst[ 0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) + 0.25f*x1e;
dst[ 1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x29 + x3d);
dst[ 2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x29 - x3d);
dst[ 3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x23 - x43);
dst[ 4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x23 + x43);
dst[ 5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x1b - x35);
dst[ 6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x1b + x35);
dst[ 7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.707106781186547f * (x22 + x44);
dst[ 8*dst_stridea] = (add ? dst[ 8*dst_stridea] : 0) + 0.707106781186547f * (x22 - x44);
dst[ 9*dst_stridea] = (add ? dst[ 9*dst_stridea] : 0) + 0.707106781186547f * (x1c + x34);
dst[10*dst_stridea] = (add ? dst[10*dst_stridea] : 0) + 0.707106781186547f * (x1c - x34);
dst[11*dst_stridea] = (add ? dst[11*dst_stridea] : 0) + 0.707106781186547f * (x24 + x42);
dst[12*dst_stridea] = (add ? dst[12*dst_stridea] : 0) + 0.707106781186547f * (x24 - x42);
dst[13*dst_stridea] = (add ? dst[13*dst_stridea] : 0) + 0.707106781186547f * (x2b - x3b);
dst[14*dst_stridea] = (add ? dst[14*dst_stridea] : 0) + 0.707106781186547f * (x2b + x3b);
dst[15*dst_stridea] = (add ? dst[15*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) - 0.25f*x1e;
dst += dst_strideb;
src += src_strideb;
}
}
#define DEF_FILTER_FREQ_FUNCS(bsize) \
static av_always_inline void filter_freq_##bsize(const float *src, int src_linesize, \
float *dst, int dst_linesize, \
AVExpr *expr, double *var_values, \
int sigma_th) \
{ \
unsigned i; \
DECLARE_ALIGNED(32, float, tmp_block1)[bsize * bsize]; \
DECLARE_ALIGNED(32, float, tmp_block2)[bsize * bsize]; \
\
/* forward DCT */ \
fdct##bsize##_1d(tmp_block1, src, 1, bsize, 1, src_linesize); \
fdct##bsize##_1d(tmp_block2, tmp_block1, bsize, 1, bsize, 1); \
\
for (i = 0; i < bsize*bsize; i++) { \
float *b = &tmp_block2[i]; \
/* frequency filtering */ \
if (expr) { \
var_values[VAR_C] = fabsf(*b); \
*b *= av_expr_eval(expr, var_values, NULL); \
} else { \
if (fabsf(*b) < sigma_th) \
*b = 0; \
} \
} \
\
/* inverse DCT */ \
idct##bsize##_1d(tmp_block1, tmp_block2, 1, bsize, 1, bsize, 0); \
idct##bsize##_1d(dst, tmp_block1, dst_linesize, 1, bsize, 1, 1); \
} \
\
static void filter_freq_sigma_##bsize(DCTdnoizContext *s, \
const float *src, int src_linesize, \
float *dst, int dst_linesize, int thread_id) \
{ \
filter_freq_##bsize(src, src_linesize, dst, dst_linesize, NULL, NULL, s->th); \
} \
\
static void filter_freq_expr_##bsize(DCTdnoizContext *s, \
const float *src, int src_linesize, \
float *dst, int dst_linesize, int thread_id) \
{ \
filter_freq_##bsize(src, src_linesize, dst, dst_linesize, \
s->expr[thread_id], s->var_values[thread_id], 0); \
}
DEF_FILTER_FREQ_FUNCS(8)
DEF_FILTER_FREQ_FUNCS(16)
#define DCT3X3_0_0 0.5773502691896258f /* 1/sqrt(3) */
#define DCT3X3_0_1 0.5773502691896258f /* 1/sqrt(3) */
#define DCT3X3_0_2 0.5773502691896258f /* 1/sqrt(3) */
#define DCT3X3_1_0 0.7071067811865475f /* 1/sqrt(2) */
#define DCT3X3_1_2 -0.7071067811865475f /* -1/sqrt(2) */
#define DCT3X3_2_0 0.4082482904638631f /* 1/sqrt(6) */
#define DCT3X3_2_1 -0.8164965809277261f /* -2/sqrt(6) */
#define DCT3X3_2_2 0.4082482904638631f /* 1/sqrt(6) */
static av_always_inline void color_decorrelation(float **dst, int dst_linesize,
const uint8_t *src, int src_linesize,
int w, int h,
int r, int g, int b)
{
int x, y;
float *dstp_r = dst[0];
float *dstp_g = dst[1];
float *dstp_b = dst[2];
for (y = 0; y < h; y++) {
const uint8_t *srcp = src;
for (x = 0; x < w; x++) {
dstp_r[x] = srcp[r] * DCT3X3_0_0 + srcp[g] * DCT3X3_0_1 + srcp[b] * DCT3X3_0_2;
dstp_g[x] = srcp[r] * DCT3X3_1_0 + srcp[b] * DCT3X3_1_2;
dstp_b[x] = srcp[r] * DCT3X3_2_0 + srcp[g] * DCT3X3_2_1 + srcp[b] * DCT3X3_2_2;
srcp += 3;
}
src += src_linesize;
dstp_r += dst_linesize;
dstp_g += dst_linesize;
dstp_b += dst_linesize;
}
}
static av_always_inline void color_correlation(uint8_t *dst, int dst_linesize,
float **src, int src_linesize,
int w, int h,
int r, int g, int b)
{
int x, y;
const float *src_r = src[0];
const float *src_g = src[1];
const float *src_b = src[2];
for (y = 0; y < h; y++) {
uint8_t *dstp = dst;
for (x = 0; x < w; x++) {
dstp[r] = av_clip_uint8(src_r[x] * DCT3X3_0_0 + src_g[x] * DCT3X3_1_0 + src_b[x] * DCT3X3_2_0);
dstp[g] = av_clip_uint8(src_r[x] * DCT3X3_0_1 + src_b[x] * DCT3X3_2_1);
dstp[b] = av_clip_uint8(src_r[x] * DCT3X3_0_2 + src_g[x] * DCT3X3_1_2 + src_b[x] * DCT3X3_2_2);
dstp += 3;
}
dst += dst_linesize;
src_r += src_linesize;
src_g += src_linesize;
src_b += src_linesize;
}
}
#define DECLARE_COLOR_FUNCS(name, r, g, b) \
static void color_decorrelation_##name(float **dst, int dst_linesize, \
const uint8_t *src, int src_linesize, \
int w, int h) \
{ \
color_decorrelation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
} \
\
static void color_correlation_##name(uint8_t *dst, int dst_linesize, \
float **src, int src_linesize, \
int w, int h) \
{ \
color_correlation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
}
DECLARE_COLOR_FUNCS(rgb, 0, 1, 2)
DECLARE_COLOR_FUNCS(bgr, 2, 1, 0)
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
DCTdnoizContext *s = ctx->priv;
int i, x, y, bx, by, linesize, *iweights, max_slice_h, slice_h;
const int bsize = 1 << s->n;
switch (inlink->format) {
case AV_PIX_FMT_BGR24:
s->color_decorrelation = color_decorrelation_bgr;
s->color_correlation = color_correlation_bgr;
break;
case AV_PIX_FMT_RGB24:
s->color_decorrelation = color_decorrelation_rgb;
s->color_correlation = color_correlation_rgb;
break;
default:
av_assert0(0);
}
s->pr_width = inlink->w - (inlink->w - bsize) % s->step;
s->pr_height = inlink->h - (inlink->h - bsize) % s->step;
if (s->pr_width != inlink->w)
av_log(ctx, AV_LOG_WARNING, "The last %d horizontal pixels won't be denoised\n",
inlink->w - s->pr_width);
if (s->pr_height != inlink->h)
av_log(ctx, AV_LOG_WARNING, "The last %d vertical pixels won't be denoised\n",
inlink->h - s->pr_height);
max_slice_h = s->pr_height / ((s->bsize - 1) * 2);
s->nb_threads = FFMIN3(MAX_THREADS, ctx->graph->nb_threads, max_slice_h);
av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",
MAX_THREADS, max_slice_h, ctx->graph->nb_threads, s->nb_threads);
s->p_linesize = linesize = FFALIGN(s->pr_width, 32);
for (i = 0; i < 2; i++) {
s->cbuf[i][0] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][0]));
s->cbuf[i][1] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][1]));
s->cbuf[i][2] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][2]));
if (!s->cbuf[i][0] || !s->cbuf[i][1] || !s->cbuf[i][2])
return AVERROR(ENOMEM);
}
/* eval expressions are probably not thread safe when the eval internal
* state can be changed (typically through load & store operations) */
if (s->expr_str) {
for (i = 0; i < s->nb_threads; i++) {
int ret = av_expr_parse(&s->expr[i], s->expr_str, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
return ret;
}
}
/* each slice will need to (pre & re)process the top and bottom block of
* the previous one in in addition to its processing area. This is because
* each pixel is averaged by all the surrounding blocks */
slice_h = (int)ceilf(s->pr_height / (float)s->nb_threads) + (s->bsize - 1) * 2;
for (i = 0; i < s->nb_threads; i++) {
s->slices[i] = av_malloc_array(linesize, slice_h * sizeof(*s->slices[i]));
if (!s->slices[i])
return AVERROR(ENOMEM);
}
s->weights = av_malloc(s->pr_height * linesize * sizeof(*s->weights));
if (!s->weights)
return AVERROR(ENOMEM);
iweights = av_calloc(s->pr_height, linesize * sizeof(*iweights));
if (!iweights)
return AVERROR(ENOMEM);
for (y = 0; y < s->pr_height - bsize + 1; y += s->step)
for (x = 0; x < s->pr_width - bsize + 1; x += s->step)
for (by = 0; by < bsize; by++)
for (bx = 0; bx < bsize; bx++)
iweights[(y + by)*linesize + x + bx]++;
for (y = 0; y < s->pr_height; y++)
for (x = 0; x < s->pr_width; x++)
s->weights[y*linesize + x] = 1. / iweights[y*linesize + x];
av_free(iweights);
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
DCTdnoizContext *s = ctx->priv;
s->bsize = 1 << s->n;
if (s->overlap == -1)
s->overlap = s->bsize - 1;
if (s->overlap > s->bsize - 1) {
av_log(s, AV_LOG_ERROR, "Overlap value can not except %d "
"with a block size of %dx%d\n",
s->bsize - 1, s->bsize, s->bsize);
return AVERROR(EINVAL);
}
if (s->expr_str) {
switch (s->n) {
case 3: s->filter_freq_func = filter_freq_expr_8; break;
case 4: s->filter_freq_func = filter_freq_expr_16; break;
default: av_assert0(0);
}
} else {
switch (s->n) {
case 3: s->filter_freq_func = filter_freq_sigma_8; break;
case 4: s->filter_freq_func = filter_freq_sigma_16; break;
default: av_assert0(0);
}
}
s->th = s->sigma * 3.;
s->step = s->bsize - s->overlap;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
AV_PIX_FMT_NONE
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
typedef struct ThreadData {
float *src, *dst;
} ThreadData;
static int filter_slice(AVFilterContext *ctx,
void *arg, int jobnr, int nb_jobs)
{
int x, y;
DCTdnoizContext *s = ctx->priv;
const ThreadData *td = arg;
const int w = s->pr_width;
const int h = s->pr_height;
const int slice_start = (h * jobnr ) / nb_jobs;
const int slice_end = (h * (jobnr+1)) / nb_jobs;
const int slice_start_ctx = FFMAX(slice_start - s->bsize + 1, 0);
const int slice_end_ctx = FFMIN(slice_end, h - s->bsize + 1);
const int slice_h = slice_end_ctx - slice_start_ctx;
const int src_linesize = s->p_linesize;
const int dst_linesize = s->p_linesize;
const int slice_linesize = s->p_linesize;
float *dst;
const float *src = td->src + slice_start_ctx * src_linesize;
const float *weights = s->weights + slice_start * dst_linesize;
float *slice = s->slices[jobnr];
// reset block sums
memset(slice, 0, (slice_h + s->bsize - 1) * dst_linesize * sizeof(*slice));
// block dct sums
for (y = 0; y < slice_h; y += s->step) {
for (x = 0; x < w - s->bsize + 1; x += s->step)
s->filter_freq_func(s, src + x, src_linesize,
slice + x, slice_linesize,
jobnr);
src += s->step * src_linesize;
slice += s->step * slice_linesize;
}
// average blocks
slice = s->slices[jobnr] + (slice_start - slice_start_ctx) * slice_linesize;
dst = td->dst + slice_start * dst_linesize;
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < w; x++)
dst[x] = slice[x] * weights[x];
slice += slice_linesize;
dst += dst_linesize;
weights += dst_linesize;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
DCTdnoizContext *s = ctx->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
int direct, plane;
AVFrame *out;
if (av_frame_is_writable(in)) {
direct = 1;
out = in;
} else {
direct = 0;
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);
}
s->color_decorrelation(s->cbuf[0], s->p_linesize,
in->data[0], in->linesize[0],
s->pr_width, s->pr_height);
for (plane = 0; plane < 3; plane++) {
ThreadData td = {
.src = s->cbuf[0][plane],
.dst = s->cbuf[1][plane],
};
ctx->internal->execute(ctx, filter_slice, &td, NULL, s->nb_threads);
}
s->color_correlation(out->data[0], out->linesize[0],
s->cbuf[1], s->p_linesize,
s->pr_width, s->pr_height);
if (!direct) {
int y;
uint8_t *dst = out->data[0];
const uint8_t *src = in->data[0];
const int dst_linesize = out->linesize[0];
const int src_linesize = in->linesize[0];
const int hpad = (inlink->w - s->pr_width) * 3;
const int vpad = (inlink->h - s->pr_height);
if (hpad) {
uint8_t *dstp = dst + s->pr_width * 3;
const uint8_t *srcp = src + s->pr_width * 3;
for (y = 0; y < s->pr_height; y++) {
memcpy(dstp, srcp, hpad);
dstp += dst_linesize;
srcp += src_linesize;
}
}
if (vpad) {
uint8_t *dstp = dst + s->pr_height * dst_linesize;
const uint8_t *srcp = src + s->pr_height * src_linesize;
for (y = 0; y < vpad; y++) {
memcpy(dstp, srcp, inlink->w * 3);
dstp += dst_linesize;
srcp += src_linesize;
}
}
av_frame_free(&in);
}
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
int i;
DCTdnoizContext *s = ctx->priv;
av_freep(&s->weights);
for (i = 0; i < 2; i++) {
av_freep(&s->cbuf[i][0]);
av_freep(&s->cbuf[i][1]);
av_freep(&s->cbuf[i][2]);
}
for (i = 0; i < s->nb_threads; i++) {
av_freep(&s->slices[i]);
av_expr_free(s->expr[i]);
}
}
static const AVFilterPad dctdnoiz_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad dctdnoiz_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_dctdnoiz = {
.name = "dctdnoiz",
.description = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."),
.priv_size = sizeof(DCTdnoizContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = dctdnoiz_inputs,
.outputs = dctdnoiz_outputs,
.priv_class = &dctdnoiz_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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