FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
vf_fftfilt.c File Reference
#include "libavfilter/internal.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/avfft.h"
#include "libavutil/eval.h"

Go to the source code of this file.

Data Structures

struct  FFTFILTContext
 

Macros

#define MAX_PLANES   4
 
#define OFFSET(x)   offsetof(FFTFILTContext, x)
 
#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
 

Enumerations

enum  EvalMode {
  EVAL_MODE_ONCE, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT,
  EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME,
  EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB,
  EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT,
  EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME,
  EVAL_MODE_NB
}
 
enum  {
  VAR_X, VAR_Y, VAR_W, VAR_H,
  VAR_N, VAR_VARS_NB
}
 
enum  { Y = 0, U, V }
 

Functions

 AVFILTER_DEFINE_CLASS (fftfilt)
 
static double lum (void *priv, double x, double y, int plane)
 
static double weight_Y (void *priv, double x, double y)
 
static double weight_U (void *priv, double x, double y)
 
static double weight_V (void *priv, double x, double y)
 
static void copy_rev (FFTSample *dest, int w, int w2)
 
static void rdft_horizontal8 (FFTFILTContext *s, AVFrame *in, int w, int h, int plane)
 
static void rdft_horizontal16 (FFTFILTContext *s, AVFrame *in, int w, int h, int plane)
 
static void rdft_vertical (FFTFILTContext *s, int h, int plane)
 
static void irdft_vertical (FFTFILTContext *s, int h, int plane)
 
static void irdft_horizontal8 (FFTFILTContext *s, AVFrame *out, int w, int h, int plane)
 
static void irdft_horizontal16 (FFTFILTContext *s, AVFrame *out, int w, int h, int plane)
 
static av_cold int initialize (AVFilterContext *ctx)
 
static void do_eval (FFTFILTContext *s, AVFilterLink *inlink, int plane)
 
static int config_props (AVFilterLink *inlink)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *in)
 
static av_cold void uninit (AVFilterContext *ctx)
 
static int query_formats (AVFilterContext *ctx)
 

Variables

static const char *const var_names [] = { "X", "Y", "W", "H", "N", NULL }
 
static const AVOption fftfilt_options []
 
static const AVFilterPad fftfilt_inputs []
 
static const AVFilterPad fftfilt_outputs []
 
AVFilter ff_vf_fftfilt
 

Detailed Description

FFT domain filtering.

Definition in file vf_fftfilt.c.

Macro Definition Documentation

◆ MAX_PLANES

#define MAX_PLANES   4

Definition at line 35 of file vf_fftfilt.c.

◆ OFFSET

#define OFFSET (   x)    offsetof(FFTFILTContext, x)

Definition at line 77 of file vf_fftfilt.c.

◆ FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 78 of file vf_fftfilt.c.

Enumeration Type Documentation

◆ EvalMode

enum EvalMode
Enumerator
EVAL_MODE_ONCE 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 

Definition at line 37 of file vf_fftfilt.c.

◆ anonymous enum

anonymous enum
Enumerator
VAR_X 
VAR_Y 
VAR_W 
VAR_H 
VAR_N 
VAR_VARS_NB 

Definition at line 73 of file vf_fftfilt.c.

◆ anonymous enum

anonymous enum
Enumerator
Y 
U 
V 

Definition at line 75 of file vf_fftfilt.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( fftfilt  )

◆ lum()

static double lum ( void *  priv,
double  x,
double  y,
int  plane 
)
inlinestatic

Definition at line 95 of file vf_fftfilt.c.

Referenced by ff_rotate_slice(), rgb24_to_yuv420p(), weight_U(), weight_V(), and weight_Y().

◆ weight_Y()

static double weight_Y ( void *  priv,
double  x,
double  y 
)
static

Definition at line 101 of file vf_fftfilt.c.

Referenced by initialize().

◆ weight_U()

static double weight_U ( void *  priv,
double  x,
double  y 
)
static

Definition at line 102 of file vf_fftfilt.c.

Referenced by initialize().

◆ weight_V()

static double weight_V ( void *  priv,
double  x,
double  y 
)
static

Definition at line 103 of file vf_fftfilt.c.

Referenced by initialize().

◆ copy_rev()

static void copy_rev ( FFTSample *  dest,
int  w,
int  w2 
)
static

Definition at line 105 of file vf_fftfilt.c.

Referenced by rdft_horizontal16(), rdft_horizontal8(), and rdft_vertical().

◆ rdft_horizontal8()

static void rdft_horizontal8 ( FFTFILTContext *  s,
AVFrame *  in,
int  w,
int  h,
int  plane 
)
static

Definition at line 117 of file vf_fftfilt.c.

Referenced by config_props().

◆ rdft_horizontal16()

static void rdft_horizontal16 ( FFTFILTContext *  s,
AVFrame *  in,
int  w,
int  h,
int  plane 
)
static

Definition at line 132 of file vf_fftfilt.c.

Referenced by config_props().

◆ rdft_vertical()

static void rdft_vertical ( FFTFILTContext *  s,
int  h,
int  plane 
)
static

Definition at line 150 of file vf_fftfilt.c.

Referenced by filter_frame().

◆ irdft_vertical()

static void irdft_vertical ( FFTFILTContext *  s,
int  h,
int  plane 
)
static

Definition at line 165 of file vf_fftfilt.c.

Referenced by filter_frame().

◆ irdft_horizontal8()

static void irdft_horizontal8 ( FFTFILTContext *  s,
AVFrame *  out,
int  w,
int  h,
int  plane 
)
static

Definition at line 179 of file vf_fftfilt.c.

Referenced by config_props().

◆ irdft_horizontal16()

static void irdft_horizontal16 ( FFTFILTContext *  s,
AVFrame *  out,
int  w,
int  h,
int  plane 
)
static

Definition at line 194 of file vf_fftfilt.c.

Referenced by config_props().

◆ initialize()

static av_cold int initialize ( AVFilterContext *  ctx)
static

Definition at line 212 of file vf_fftfilt.c.

◆ do_eval()

static void do_eval ( FFTFILTContext *  s,
AVFilterLink *  inlink,
int  plane 
)
static

Definition at line 246 of file vf_fftfilt.c.

Referenced by config_props(), and filter_frame().

◆ config_props()

static int config_props ( AVFilterLink *  inlink)
static

Definition at line 265 of file vf_fftfilt.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink *  inlink,
AVFrame *  in 
)
static

Definition at line 330 of file vf_fftfilt.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext *  ctx)
static

Definition at line 372 of file vf_fftfilt.c.

◆ query_formats()

static int query_formats ( AVFilterContext *  ctx)
static

Definition at line 388 of file vf_fftfilt.c.

Variable Documentation

◆ var_names

const char* const var_names[] = { "X", "Y", "W", "H", "N", NULL }
static

Definition at line 72 of file vf_fftfilt.c.

Referenced by initialize().

◆ fftfilt_options

const AVOption fftfilt_options[]
static
Initial value:
= {
{ "dc_Y", "adjust gain in Y plane", OFFSET(dc[Y]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "dc_U", "adjust gain in U plane", OFFSET(dc[U]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "dc_V", "adjust gain in V plane", OFFSET(dc[V]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
{ "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{NULL},
}

Definition at line 80 of file vf_fftfilt.c.

◆ fftfilt_inputs

const AVFilterPad fftfilt_inputs[]
static
Initial value:
= {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.filter_frame = filter_frame,
},
{ NULL }
}

Definition at line 413 of file vf_fftfilt.c.

◆ fftfilt_outputs

const AVFilterPad fftfilt_outputs[]
static
Initial value:
= {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
}

Definition at line 423 of file vf_fftfilt.c.

◆ ff_vf_fftfilt

AVFilter ff_vf_fftfilt
Initial value:
= {
.name = "fftfilt",
.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to pixels in frequency domain."),
.priv_size = sizeof(FFTFILTContext),
.priv_class = &fftfilt_class,
.inputs = fftfilt_inputs,
.outputs = fftfilt_outputs,
.query_formats = query_formats,
.init = initialize,
.uninit = uninit,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
}

Definition at line 431 of file vf_fftfilt.c.

init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
fftfilt_outputs
static const AVFilterPad fftfilt_outputs[]
Definition: vf_fftfilt.c:423
config_props
static int config_props(AVFilterLink *inlink)
Definition: vf_fftfilt.c:265
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_fftfilt.c:372
V
@ V
Definition: vf_fftfilt.c:75
EVAL_MODE_FRAME
@ EVAL_MODE_FRAME
Definition: vf_fftfilt.c:39
U
@ U
Definition: vf_fftfilt.c:75
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
OFFSET
#define OFFSET(x)
Definition: vf_fftfilt.c:77
NULL
#define NULL
Definition: coverity.c:32
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
initialize
static av_cold int initialize(AVFilterContext *ctx)
Definition: vf_fftfilt.c:212
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
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:188
FFTFILTContext
Definition: vf_fftfilt.c:43
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
fftfilt_inputs
static const AVFilterPad fftfilt_inputs[]
Definition: vf_fftfilt.c:413
Y
@ Y
Definition: vf_fftfilt.c:75
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_fftfilt.c:330
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:223
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
EVAL_MODE_INIT
@ EVAL_MODE_INIT
Definition: vf_fftfilt.c:38
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_fftfilt.c:388
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:565
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:227
FLAGS
#define FLAGS
Definition: vf_fftfilt.c:78
EVAL_MODE_NB
@ EVAL_MODE_NB
Definition: vf_fftfilt.c:40
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:232
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