doxygen/4.1/vf__dctdnoiz_8c_source.html

 /*

  * 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];

     const uint8_t *srcp = src[0];


     for (y = 0; y < h; y++) {

         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;

         }

         srcp   += src_linesize - w * 3;

         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];

     uint8_t *dstp = dst[0];


     for (y = 0; y < h; y++) {

         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;

         }

         dstp  += dst_linesize - w * 3;

         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 av_always_inline void color_decorrelation_gbrp(float **dst, int dst_linesize,

                                                       const uint8_t **src, int src_linesize,

                                                       int w, int h)

 {

     int x, y;

     float *dstp_r = dst[0];

     float *dstp_g = dst[1];

     float *dstp_b = dst[2];

     const uint8_t *srcp_r = src[2];

     const uint8_t *srcp_g = src[0];

     const uint8_t *srcp_b = src[1];


     for (y = 0; y < h; y++) {

         for (x = 0; x < w; x++) {

             dstp_r[x] = srcp_r[x] * DCT3X3_0_0 + srcp_g[x] * DCT3X3_0_1 + srcp_b[x] * DCT3X3_0_2;

             dstp_g[x] = srcp_r[x] * DCT3X3_1_0 +                          srcp_b[x] * DCT3X3_1_2;

             dstp_b[x] = srcp_r[x] * DCT3X3_2_0 + srcp_g[x] * DCT3X3_2_1 + srcp_b[x] * DCT3X3_2_2;

         }

         srcp_r += src_linesize;

         srcp_g += src_linesize;

         srcp_b += src_linesize;

         dstp_r += dst_linesize;

         dstp_g += dst_linesize;

         dstp_b += dst_linesize;

     }

 }


 static av_always_inline void color_correlation_gbrp(uint8_t **dst, int dst_linesize,

                                                     float **src, int src_linesize,

                                                     int w, int h)

 {

     int x, y;

     const float *src_r = src[0];

     const float *src_g = src[1];

     const float *src_b = src[2];

     uint8_t *dstp_r = dst[2];

     uint8_t *dstp_g = dst[0];

     uint8_t *dstp_b = dst[1];


     for (y = 0; y < h; y++) {

         for (x = 0; x < w; x++) {

             dstp_r[x] = av_clip_uint8(src_r[x] * DCT3X3_0_0 + src_g[x] * DCT3X3_1_0 + src_b[x] * DCT3X3_2_0);

             dstp_g[x] = av_clip_uint8(src_r[x] * DCT3X3_0_1 +                         src_b[x] * DCT3X3_2_1);

             dstp_b[x] = av_clip_uint8(src_r[x] * DCT3X3_0_2 + src_g[x] * DCT3X3_1_2 + src_b[x] * DCT3X3_2_2);

         }

         dstp_r += dst_linesize;

         dstp_g += dst_linesize;

         dstp_b += dst_linesize;

         src_r += src_linesize;

         src_g += src_linesize;

         src_b += src_linesize;

     }

 }


 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;

     case AV_PIX_FMT_GBRP:

         s->color_decorrelation = color_decorrelation_gbrp;

         s->color_correlation   = color_correlation_gbrp;

         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, ff_filter_get_nb_threads(ctx), max_slice_h);

     av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",

            MAX_THREADS, max_slice_h, ff_filter_get_nb_threads(ctx), 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_GBRP,

         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,

                            (const uint8_t **)in->data, 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, 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,

 };

plane
int plane
Definition: avisynth_c.h:422

fdct8_1d
static void av_always_inline fdct8_1d(float *dst, const float *src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb)
Definition: vf_dctdnoiz.c:91

NULL
#define NULL
Definition: coverity.c:32

DECLARE_COLOR_FUNCS
#define DECLARE_COLOR_FUNCS(name, r, g, b)
Definition: vf_dctdnoiz.c:460

DCT3X3_0_2
#define DCT3X3_0_2
Definition: vf_dctdnoiz.c:403

AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226

DCTdnoizContext::weights
float * weights
Definition: vf_dctdnoiz.c:55

AV_PIX_FMT_NONE
Definition: pixfmt.h:65

h
h
Definition: vp9dsp_template.c:2038

AVOption
AVOption.
Definition: opt.h:246

AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182

AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68

g
const char * g
Definition: vf_curves.c:115

AV_OPT_TYPE_INT
Definition: opt.h:223

AVFilterLink::h
int h
agreed upon image height
Definition: avfilter.h:450

AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168

DCTdnoizContext::step
int step
Definition: vf_dctdnoiz.c:58

b
const char * b
Definition: vf_curves.c:116

fdct16_1d
static void av_always_inline fdct16_1d(float *dst, const float *src, int dst_stridea, int dst_strideb, int src_stridea, int src_strideb)
Definition: vf_dctdnoiz.c:173

av_expr_parse
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:679

ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99

color_correlation_gbrp
static av_always_inline void color_correlation_gbrp(uint8_t **dst, int dst_linesize, float **src, int src_linesize, int w, int h)
Definition: vf_dctdnoiz.c:505

DCT3X3_2_0
#define DCT3X3_2_0
Definition: vf_dctdnoiz.c:406

src
#define src
Definition: vp8dsp.c:254

DCTdnoizContext::nb_threads
int nb_threads
Definition: vf_dctdnoiz.c:49

VAR_VARS_NB
Definition: vf_dctdnoiz.c:37

av_calloc
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244

ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283

AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125

srcp
BYTE int const BYTE * srcp
Definition: avisynth_c.h:813

dctdnoiz_options
static const AVOption dctdnoiz_options[]
Definition: vf_dctdnoiz.c:79

AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60

ff_vf_dctdnoiz
AVFilter ff_vf_dctdnoiz
Definition: vf_dctdnoiz.c:824

av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37

FLAGS
#define FLAGS
Definition: vf_dctdnoiz.c:78

color_decorrelation
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)
Definition: vf_dctdnoiz.c:410

ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080

uint8_t
uint8_t
Definition: audio_convert.c:194

av_cold
#define av_cold
Definition: attributes.h:82

av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31

dctdnoiz_inputs
static const AVFilterPad dctdnoiz_inputs[]
Definition: vf_dctdnoiz.c:806

MAX_NBITS
#define MAX_NBITS
Definition: vf_dctdnoiz.c:74

DCTdnoizContext::color_correlation
void(* color_correlation)(uint8_t **dst, int dst_linesize, float **src, int src_linesize, int w, int h)
Definition: vf_dctdnoiz.c:68

opt.h
AVOptions.

DCTdnoizContext::pr_height
int pr_height
Definition: vf_dctdnoiz.c:50

f
#define f(width, name)
Definition: cbs_vp9.c:255

query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_dctdnoiz.c:653

AVExpr
Definition: eval.c:157

filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_dctdnoiz.c:718

DCTdnoizContext::overlap
int overlap
Definition: vf_dctdnoiz.c:57

DCT3X3_2_1
#define DCT3X3_2_1
Definition: vf_dctdnoiz.c:407

AV_OPT_TYPE_STRING
Definition: opt.h:227

FFMIN3
#define FFMIN3(a, b, c)
Definition: common.h:97

DCTdnoizContext::var_values
double var_values[MAX_THREADS][VAR_VARS_NB]
Definition: vf_dctdnoiz.c:47

FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48

av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28

OFFSET
#define OFFSET(x)
Definition: vf_dctdnoiz.c:77

AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54

AVFilterLink
A link between two filters.
Definition: avfilter.h:439

DCTdnoizContext::slices
float * slices[MAX_THREADS]
Definition: vf_dctdnoiz.c:54

AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176

ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:568

td
#define td
Definition: regdef.h:70

uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_dctdnoiz.c:789

ThreadData::src
float * src
Definition: vf_dctdnoiz.c:667

dstp
BYTE * dstp
Definition: avisynth_c.h:813

AVERROR
#define AVERROR(e)
Definition: error.h:43

av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202

AV_OPT_TYPE_FLOAT
Definition: opt.h:226

NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186

r
const char * r
Definition: vf_curves.c:114

AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:353

AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:116

AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197

arg
const char * arg
Definition: jacosubdec.c:66

color_correlation
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)
Definition: vf_dctdnoiz.c:435

avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().

DCTdnoizContext::expr
AVExpr * expr[MAX_THREADS]
Definition: vf_dctdnoiz.c:46

VAR_C
Definition: vf_dctdnoiz.c:37

DCTdnoizContext::sigma
float sigma
Definition: vf_dctdnoiz.c:51

MAX_THREADS
#define MAX_THREADS
Definition: vf_dctdnoiz.c:39

FFMAX
#define FFMAX(a, b)
Definition: common.h:94

var_names
static const char *const var_names[]
A simple, relatively efficient and slow DCT image denoiser.
Definition: vf_dctdnoiz.c:36

DCT3X3_2_2
#define DCT3X3_2_2
Definition: vf_dctdnoiz.c:408

MIN_NBITS
#define MIN_NBITS
Definition: vf_dctdnoiz.c:73

AVFilterLink::w
int w
agreed upon image width
Definition: avfilter.h:449

ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:802

FFMIN
#define FFMIN(a, b)
Definition: common.h:96

w
uint8_t w
Definition: llviddspenc.c:38

void
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)

ctx
AVFormatContext * ctx
Definition: movenc.c:48

DCTdnoizContext::p_linesize
int p_linesize
Definition: vf_dctdnoiz.c:56

s
#define s(width, name)
Definition: cbs_vp9.c:257

n
int n
Definition: avisynth_c.h:684

AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69

AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(dctdnoiz)

filter_slice
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_dctdnoiz.c:670

inputs
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193

outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203

AVFilterLink::format
int format
agreed upon media format
Definition: avfilter.h:456

ThreadData::dst
AVFrame * dst
Definition: vf_blend.c:55

av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:334

av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:594

ThreadData
Used for passing data between threads.
Definition: af_adeclick.c:484

AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257

in
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
Definition: audio_convert.c:194

DCTdnoizContext::color_decorrelation
void(* color_decorrelation)(float **dst, int dst_linesize, const uint8_t **src, int src_linesize, int w, int h)
Definition: vf_dctdnoiz.c:65

AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67

idct16_1d
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)
Definition: vf_dctdnoiz.c:257

AVFilter
Filter definition.
Definition: avfilter.h:144

DCT3X3_0_1
#define DCT3X3_0_1
Definition: vf_dctdnoiz.c:402

DEF_FILTER_FREQ_FUNCS
#define DEF_FILTER_FREQ_FUNCS(bsize)
Definition: vf_dctdnoiz.c:352

AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:148

color_decorrelation_gbrp
static av_always_inline void color_decorrelation_gbrp(float **dst, int dst_linesize, const uint8_t **src, int src_linesize, int w, int h)
Definition: vf_dctdnoiz.c:478

AVFilterContext::outputs
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350

pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266

DCTdnoizContext::filter_freq_func
void(* filter_freq_func)(struct DCTdnoizContext *s, const float *src, int src_linesize, float *dst, int dst_linesize, int thread_id)
Definition: vf_dctdnoiz.c:61

flags
#define flags(name, subs,...)
Definition: cbs_av1.c:596

AVFilterContext::internal
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:378

AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240

DCT3X3_0_0
#define DCT3X3_0_0
Definition: vf_dctdnoiz.c:401

int
int
Definition: ffmpeg_filter.c:191

DCTdnoizContext::pr_width
int pr_width
Definition: vf_dctdnoiz.c:50

DCTdnoizContext::n
int n
Definition: vf_dctdnoiz.c:59

AVFilterInternal::execute
avfilter_execute_func * execute
Definition: internal.h:155

ThreadData::src
const uint8_t * src
Definition: vf_bm3d.c:56

DCTdnoizContext::cbuf
float * cbuf[2][3]
Definition: vf_dctdnoiz.c:53

slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2029

dctdnoiz_outputs
static const AVFilterPad dctdnoiz_outputs[]
Definition: vf_dctdnoiz.c:816

av_free
#define av_free(p)
Definition: tableprint_vlc.h:34

AVFilterLink::dst
AVFilterContext * dst
dest filter
Definition: avfilter.h:443

DCT3X3_1_0
#define DCT3X3_1_0
Definition: vf_dctdnoiz.c:404

DEFAULT_NBITS
#define DEFAULT_NBITS
Definition: vf_dctdnoiz.c:75

AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64

config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_dctdnoiz.c:532

AVFilterContext
An instance of a filter.
Definition: avfilter.h:338

DCTdnoizContext::expr_str
char * expr_str
Definition: vf_dctdnoiz.c:45

out
FILE * out
Definition: movenc.c:54

av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35

AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201

av_always_inline
#define av_always_inline
Definition: attributes.h:39

av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32

internal.h
internal API functions

DCT3X3_1_2
#define DCT3X3_1_2
Definition: vf_dctdnoiz.c:405

idct8_1d
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)
Definition: vf_dctdnoiz.c:129

DCTdnoizContext
Definition: vf_dctdnoiz.c:41

init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_dctdnoiz.c:619

AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64

av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654

DCTdnoizContext::th
float th
Definition: vf_dctdnoiz.c:52

eval.h
simple arithmetic expression evaluator

DCTdnoizContext::bsize
int bsize
Definition: vf_dctdnoiz.c:60