FFmpeg
vf_gradfun.c
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1 /*
2  * Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
3  * Copyright (c) 2009 Loren Merritt <lorenm@u.washington.edu>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * gradfun debanding filter, ported from MPlayer
25  * libmpcodecs/vf_gradfun.c
26  *
27  * Apply a boxblur debanding algorithm (based on the gradfun2db
28  * AviSynth filter by prunedtree).
29  * For each pixel, if it is within the threshold of the blurred value, make it
30  * closer. So now we have a smoothed and higher bitdepth version of all the
31  * shallow gradients, while leaving detailed areas untouched.
32  * Dither it back to 8bit.
33  */
34 
35 #include "libavutil/emms.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/common.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/mem_internal.h"
40 #include "libavutil/opt.h"
41 #include "libavutil/pixdesc.h"
42 #include "avfilter.h"
43 #include "gradfun.h"
44 #include "internal.h"
45 #include "video.h"
46 
47 DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = {
48  {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
49  {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E},
50  {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E},
51  {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E},
52  {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A},
53  {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A},
54  {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A},
55  {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A},
56 };
57 
58 void ff_gradfun_filter_line_c(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
59 {
60  int x;
61  for (x = 0; x < width; dc += x & 1, x++) {
62  int pix = src[x] << 7;
63  int delta = dc[0] - pix;
64  int m = abs(delta) * thresh >> 16;
65  m = FFMAX(0, 127 - m);
66  m = m * m * delta >> 14;
67  pix += m + dithers[x & 7];
68  dst[x] = av_clip_uint8(pix >> 7);
69  }
70 }
71 
72 void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
73 {
74  int x, v, old;
75  for (x = 0; x < width; x++) {
76  v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize];
77  old = buf[x];
78  buf[x] = v;
79  dc[x] = v - old;
80  }
81 }
82 
83 static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
84 {
85  int bstride = FFALIGN(width, 16) / 2;
86  int y;
87  uint32_t dc_factor = (1 << 21) / (r * r);
88  uint16_t *dc = ctx->buf + 16;
89  uint16_t *buf = ctx->buf + bstride + 32;
90  int thresh = ctx->thresh;
91 
92  memset(dc, 0, (bstride + 16) * sizeof(*buf));
93  for (y = 0; y < r; y++)
94  ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2);
95  for (;;) {
96  if (y + 1 < height - r) {
97  int mod = ((y + r) / 2) % r;
98  uint16_t *buf0 = buf + mod * bstride;
99  uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride;
100  int x, v;
101  ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2);
102  for (x = v = 0; x < r; x++)
103  v += dc[x];
104  for (; x < width / 2; x++) {
105  v += dc[x] - dc[x-r];
106  dc[x-r] = v * dc_factor >> 16;
107  }
108  for (; x < (width + r + 1) / 2; x++)
109  dc[x-r] = v * dc_factor >> 16;
110  for (x = -r / 2; x < 0; x++)
111  dc[x] = dc[0];
112  }
113  if (y == r) {
114  for (y = 0; y < r; y++)
115  ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
116  }
117  ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
118  if (++y >= height) break;
119  ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
120  if (++y >= height) break;
121  }
122  emms_c();
123 }
124 
126 {
127  GradFunContext *s = ctx->priv;
128 
129  s->thresh = (1 << 15) / s->strength;
130  s->radius = av_clip((s->radius + 1) & ~1, 4, 32);
131 
132  s->blur_line = ff_gradfun_blur_line_c;
133  s->filter_line = ff_gradfun_filter_line_c;
134 
135 #if ARCH_X86
137 #endif
138 
139  av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", s->strength, s->radius);
140 
141  return 0;
142 }
143 
145 {
146  GradFunContext *s = ctx->priv;
147  av_freep(&s->buf);
148 }
149 
150 static const enum AVPixelFormat pix_fmts[] = {
157 };
158 
160 {
161  GradFunContext *s = inlink->dst->priv;
163  int hsub = desc->log2_chroma_w;
164  int vsub = desc->log2_chroma_h;
165 
166  av_freep(&s->buf);
167  s->buf = av_calloc((FFALIGN(inlink->w, 16) * (s->radius + 1) / 2 + 32), sizeof(*s->buf));
168  if (!s->buf)
169  return AVERROR(ENOMEM);
170 
171  s->chroma_w = AV_CEIL_RSHIFT(inlink->w, hsub);
172  s->chroma_h = AV_CEIL_RSHIFT(inlink->h, vsub);
173  s->chroma_r = av_clip(((((s->radius >> hsub) + (s->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32);
174 
175  return 0;
176 }
177 
179 {
180  GradFunContext *s = inlink->dst->priv;
181  AVFilterLink *outlink = inlink->dst->outputs[0];
182  AVFrame *out;
183  int p, direct;
184 
185  if (av_frame_is_writable(in)) {
186  direct = 1;
187  out = in;
188  } else {
189  direct = 0;
190  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
191  if (!out) {
192  av_frame_free(&in);
193  return AVERROR(ENOMEM);
194  }
196  }
197 
198  for (p = 0; p < 4 && in->data[p] && in->linesize[p]; p++) {
199  int w = inlink->w;
200  int h = inlink->h;
201  int r = s->radius;
202  if (p) {
203  w = s->chroma_w;
204  h = s->chroma_h;
205  r = s->chroma_r;
206  }
207 
208  if (FFMIN(w, h) > 2 * r)
209  filter(s, out->data[p], in->data[p], w, h, out->linesize[p], in->linesize[p], r);
210  else if (out->data[p] != in->data[p])
211  av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p], w, h);
212  }
213 
214  if (!direct)
215  av_frame_free(&in);
216 
217  return ff_filter_frame(outlink, out);
218 }
219 
220 #define OFFSET(x) offsetof(GradFunContext, x)
221 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
222 
223 static const AVOption gradfun_options[] = {
224  { "strength", "The maximum amount by which the filter will change any one pixel.", OFFSET(strength), AV_OPT_TYPE_FLOAT, { .dbl = 1.2 }, 0.51, 64, FLAGS },
225  { "radius", "The neighborhood to fit the gradient to.", OFFSET(radius), AV_OPT_TYPE_INT, { .i64 = 16 }, 4, 32, FLAGS },
226  { NULL }
227 };
228 
229 AVFILTER_DEFINE_CLASS(gradfun);
230 
232  {
233  .name = "default",
234  .type = AVMEDIA_TYPE_VIDEO,
235  .config_props = config_input,
236  .filter_frame = filter_frame,
237  },
238 };
239 
241  .name = "gradfun",
242  .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."),
243  .priv_size = sizeof(GradFunContext),
244  .priv_class = &gradfun_class,
245  .init = init,
246  .uninit = uninit,
251 };
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:112
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
av_clip
#define av_clip
Definition: common.h:99
r
const char * r
Definition: vf_curves.c:127
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
mem_internal.h
out
FILE * out
Definition: movenc.c:55
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
FILTER_PIXFMTS_ARRAY
#define FILTER_PIXFMTS_ARRAY(array)
Definition: internal.h:162
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:357
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
AV_PIX_FMT_YUV440P
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:106
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
video.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:74
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
av_cold
#define av_cold
Definition: attributes.h:90
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
emms_c
#define emms_c()
Definition: emms.h:63
width
#define width
dither
static const uint16_t dither[8][8]
Definition: vf_gradfun.c:47
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:59
ctx
AVFormatContext * ctx
Definition: movenc.c:49
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: vf_gradfun.c:150
NULL
#define NULL
Definition: coverity.c:32
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:709
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_gradfun.c:144
abs
#define abs(x)
Definition: cuda_runtime.h:35
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_gradfun.c:178
OFFSET
#define OFFSET(x)
Definition: vf_gradfun.c:220
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:81
dithers
static const uint8_t dithers[8][8][8]
Definition: swscale_unscaled.c:38
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:94
avfilter_vf_gradfun_inputs
static const AVFilterPad avfilter_vf_gradfun_inputs[]
Definition: vf_gradfun.c:231
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
FLAGS
#define FLAGS
Definition: vf_gradfun.c:221
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:645
ff_vf_gradfun
const AVFilter ff_vf_gradfun
Definition: vf_gradfun.c:240
ff_gradfun_init_x86
void ff_gradfun_init_x86(GradFunContext *gf)
Definition: vf_gradfun_init.c:91
height
#define height
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(gradfun)
internal.h
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:147
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:248
ff_gradfun_filter_line_c
void ff_gradfun_filter_line_c(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
Definition: vf_gradfun.c:58
emms.h
filter
static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
Definition: vf_gradfun.c:83
common.h
delta
float delta
Definition: vorbis_enc_data.h:430
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
gradfun_options
static const AVOption gradfun_options[]
Definition: vf_gradfun.c:223
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
ff_gradfun_blur_line_c
void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
Definition: vf_gradfun.c:72
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
mod
static int mod(int a, int b)
Modulo operation with only positive remainders.
Definition: vf_v360.c:750
AVFilter
Filter definition.
Definition: avfilter.h:166
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
avfilter.h
av_clip_uint8
#define av_clip_uint8
Definition: common.h:105
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:78
gradfun.h
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
AV_PIX_FMT_GBRP
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:165
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_gradfun.c:159
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:77
mem.h
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:80
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:79
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
h
h
Definition: vp9dsp_template.c:2038
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_gradfun.c:125
GradFunContext
Holds instance-specific information for gradfun.
Definition: gradfun.h:28