FFmpeg
vf_colorlevels.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "drawutils.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29 
30 #define R 0
31 #define G 1
32 #define B 2
33 #define A 3
34 
35 typedef struct Range {
36  double in_min, in_max;
37  double out_min, out_max;
38 } Range;
39 
40 typedef struct ColorLevelsContext {
41  const AVClass *class;
42  Range range[4];
43 
44  int nb_comp;
45  int bpp;
46  int step;
47  uint8_t rgba_map[4];
48  int linesize;
49 
50  int (*colorlevels_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
52 
53 #define OFFSET(x) offsetof(ColorLevelsContext, x)
54 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
55 static const AVOption colorlevels_options[] = {
56  { "rimin", "set input red black point", OFFSET(range[R].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
57  { "gimin", "set input green black point", OFFSET(range[G].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
58  { "bimin", "set input blue black point", OFFSET(range[B].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
59  { "aimin", "set input alpha black point", OFFSET(range[A].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
60  { "rimax", "set input red white point", OFFSET(range[R].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
61  { "gimax", "set input green white point", OFFSET(range[G].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
62  { "bimax", "set input blue white point", OFFSET(range[B].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
63  { "aimax", "set input alpha white point", OFFSET(range[A].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
64  { "romin", "set output red black point", OFFSET(range[R].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
65  { "gomin", "set output green black point", OFFSET(range[G].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
66  { "bomin", "set output blue black point", OFFSET(range[B].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
67  { "aomin", "set output alpha black point", OFFSET(range[A].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
68  { "romax", "set output red white point", OFFSET(range[R].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
69  { "gomax", "set output green white point", OFFSET(range[G].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
70  { "bomax", "set output blue white point", OFFSET(range[B].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
71  { "aomax", "set output alpha white point", OFFSET(range[A].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
72  { NULL }
73 };
74 
75 AVFILTER_DEFINE_CLASS(colorlevels);
76 
78 {
79  static const enum AVPixelFormat pix_fmts[] = {
88  };
89 
90  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
91  if (!fmts_list)
92  return AVERROR(ENOMEM);
93  return ff_set_common_formats(ctx, fmts_list);
94 }
95 
96 typedef struct ThreadData {
97  const uint8_t *srcrow;
100  int src_linesize;
101 
102  float coeff[4];
103 
104  int h;
105 
106  int imin[4];
107  int omin[4];
108 } ThreadData;
109 
110 #define LOAD_COMMON \
111  ColorLevelsContext *s = ctx->priv; \
112  const ThreadData *td = arg; \
113  const int process_h = td->h; \
114  const int slice_start = (process_h * jobnr ) / nb_jobs; \
115  const int slice_end = (process_h * (jobnr+1)) / nb_jobs; \
116  const uint8_t *srcrow = td->srcrow; \
117  uint8_t *dstrow = td->dstrow; \
118  const int step = s->step;
119 
120 static int colorlevels_slice_8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
121 {
123 
124  for (int comp = 0; comp < s->nb_comp; comp++) {
125  const uint8_t offset = s->rgba_map[comp];
126  const int imin = td->imin[comp];
127  const int omin = td->omin[comp];
128  const float coeff = td->coeff[comp];
129 
130  for (int y = slice_start; y < slice_end; y++) {
131  const uint8_t *src = srcrow + y * td->src_linesize;
132  uint8_t *dst = dstrow + y * td->dst_linesize;
133 
134  for (int x = 0; x < s->linesize; x += step)
135  dst[x + offset] = av_clip_uint8((src[x + offset] - imin) * coeff + omin);
136  }
137  }
138 
139  return 0;
140 }
141 
142 static int colorlevels_slice_16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
143 {
145 
146  for (int comp = 0; comp < s->nb_comp; comp++) {
147  const uint8_t offset = s->rgba_map[comp];
148  const int imin = td->imin[comp];
149  const int omin = td->omin[comp];
150  const float coeff = td->coeff[comp];
151 
152  for (int y = slice_start; y < slice_end; y++) {
153  const uint16_t *src = (const uint16_t *)(srcrow + y * td->src_linesize);
154  uint16_t *dst = (uint16_t *)(dstrow + y * td->dst_linesize);
155 
156  for (int x = 0; x < s->linesize; x += step)
157  dst[x + offset] = av_clip_uint16((src[x + offset] - imin) * coeff + omin);
158  }
159  }
160 
161  return 0;
162 }
163 
165 {
166  AVFilterContext *ctx = inlink->dst;
167  ColorLevelsContext *s = ctx->priv;
169 
170  s->nb_comp = desc->nb_components;
171  s->bpp = desc->comp[0].depth >> 3;
172  s->step = av_get_padded_bits_per_pixel(desc) >> (3 + (s->bpp == 2));
173  s->linesize = inlink->w * s->step;
174  ff_fill_rgba_map(s->rgba_map, inlink->format);
175 
177  if (s->bpp == 2)
179 
180  return 0;
181 }
182 
184 {
185  AVFilterContext *ctx = inlink->dst;
186  ColorLevelsContext *s = ctx->priv;
187  AVFilterLink *outlink = ctx->outputs[0];
188  const int step = s->step;
189  ThreadData td;
190  AVFrame *out;
191 
192  if (av_frame_is_writable(in)) {
193  out = in;
194  } else {
195  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
196  if (!out) {
197  av_frame_free(&in);
198  return AVERROR(ENOMEM);
199  }
200  av_frame_copy_props(out, in);
201  }
202 
203  td.h = inlink->h;
204  td.dst_linesize = out->linesize[0];
205  td.src_linesize = in->linesize[0];
206  td.srcrow = in->data[0];
207  td.dstrow = out->data[0];
208 
209  switch (s->bpp) {
210  case 1:
211  for (int i = 0; i < s->nb_comp; i++) {
212  Range *r = &s->range[i];
213  const uint8_t offset = s->rgba_map[i];
214  const uint8_t *srcrow = in->data[0];
215  int imin = lrint(r->in_min * UINT8_MAX);
216  int imax = lrint(r->in_max * UINT8_MAX);
217  int omin = lrint(r->out_min * UINT8_MAX);
218  int omax = lrint(r->out_max * UINT8_MAX);
219  float coeff;
220 
221  if (imin < 0) {
222  imin = UINT8_MAX;
223  for (int y = 0; y < inlink->h; y++) {
224  const uint8_t *src = srcrow;
225 
226  for (int x = 0; x < s->linesize; x += step)
227  imin = FFMIN(imin, src[x + offset]);
228  srcrow += in->linesize[0];
229  }
230  }
231  if (imax < 0) {
232  srcrow = in->data[0];
233  imax = 0;
234  for (int y = 0; y < inlink->h; y++) {
235  const uint8_t *src = srcrow;
236 
237  for (int x = 0; x < s->linesize; x += step)
238  imax = FFMAX(imax, src[x + offset]);
239  srcrow += in->linesize[0];
240  }
241  }
242 
243  coeff = (omax - omin) / (double)(imax - imin);
244 
245  td.coeff[i] = coeff;
246  td.imin[i] = imin;
247  td.omin[i] = omin;
248  }
249  break;
250  case 2:
251  for (int i = 0; i < s->nb_comp; i++) {
252  Range *r = &s->range[i];
253  const uint8_t offset = s->rgba_map[i];
254  const uint8_t *srcrow = in->data[0];
255  int imin = lrint(r->in_min * UINT16_MAX);
256  int imax = lrint(r->in_max * UINT16_MAX);
257  int omin = lrint(r->out_min * UINT16_MAX);
258  int omax = lrint(r->out_max * UINT16_MAX);
259  float coeff;
260 
261  if (imin < 0) {
262  imin = UINT16_MAX;
263  for (int y = 0; y < inlink->h; y++) {
264  const uint16_t *src = (const uint16_t *)srcrow;
265 
266  for (int x = 0; x < s->linesize; x += step)
267  imin = FFMIN(imin, src[x + offset]);
268  srcrow += in->linesize[0];
269  }
270  }
271  if (imax < 0) {
272  srcrow = in->data[0];
273  imax = 0;
274  for (int y = 0; y < inlink->h; y++) {
275  const uint16_t *src = (const uint16_t *)srcrow;
276 
277  for (int x = 0; x < s->linesize; x += step)
278  imax = FFMAX(imax, src[x + offset]);
279  srcrow += in->linesize[0];
280  }
281  }
282 
283  coeff = (omax - omin) / (double)(imax - imin);
284 
285  td.coeff[i] = coeff;
286  td.imin[i] = imin;
287  td.omin[i] = omin;
288  }
289  break;
290  }
291 
292  ctx->internal->execute(ctx, s->colorlevels_slice, &td, NULL,
293  FFMIN(inlink->h, ff_filter_get_nb_threads(ctx)));
294 
295  if (in != out)
296  av_frame_free(&in);
297  return ff_filter_frame(outlink, out);
298 }
299 
300 static const AVFilterPad colorlevels_inputs[] = {
301  {
302  .name = "default",
303  .type = AVMEDIA_TYPE_VIDEO,
304  .filter_frame = filter_frame,
305  .config_props = config_input,
306  },
307  { NULL }
308 };
309 
311  {
312  .name = "default",
313  .type = AVMEDIA_TYPE_VIDEO,
314  },
315  { NULL }
316 };
317 
319  .name = "colorlevels",
320  .description = NULL_IF_CONFIG_SMALL("Adjust the color levels."),
321  .priv_size = sizeof(ColorLevelsContext),
322  .priv_class = &colorlevels_class,
324  .inputs = colorlevels_inputs,
325  .outputs = colorlevels_outputs,
328 };
#define NULL
Definition: coverity.c:32
#define G
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2573
This structure describes decoded (raw) audio or video data.
Definition: frame.h:314
AVOption.
Definition: opt.h:248
const char * desc
Definition: libsvtav1.c:79
misc image utilities
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
#define AV_PIX_FMT_RGBA64
Definition: pixfmt.h:389
#define AV_PIX_FMT_BGRA64
Definition: pixfmt.h:394
packed BGR 8:8:8, 32bpp, XBGRXBGR... X=unused/undefined
Definition: pixfmt.h:239
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
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
int(* colorlevels_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
float coeff[4]
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:287
#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:126
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1094
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
packed RGB 8:8:8, 32bpp, RGBXRGBX... X=unused/undefined
Definition: pixfmt.h:238
AVOptions.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
#define A
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
static int query_formats(AVFilterContext *ctx)
#define AV_PIX_FMT_BGR48
Definition: pixfmt.h:390
double out_min
A filter pad used for either input or output.
Definition: internal.h:54
#define src
Definition: vp8dsp.c:255
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:588
#define td
Definition: regdef.h:70
static int colorlevels_slice_8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
#define FLAGS
static const AVFilterPad colorlevels_inputs[]
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options...
Definition: avfilter.c:882
const char * r
Definition: vf_curves.c:116
void * priv
private data for use by the filter
Definition: avfilter.h:356
int av_get_padded_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel for the pixel format described by pixdesc, including any padding ...
Definition: pixdesc.c:2538
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
const char * arg
Definition: jacosubdec.c:66
#define AV_PIX_FMT_RGB48
Definition: pixfmt.h:385
#define FFMAX(a, b)
Definition: common.h:103
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
const uint8_t * srcrow
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
static int config_input(AVFilterLink *inlink)
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:802
#define av_clip_uint16
Definition: common.h:134
#define FFMIN(a, b)
Definition: common.h:105
static const AVOption colorlevels_options[]
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_acrusher.c:336
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
uint8_t * dstrow
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:85
misc drawing utilities
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:594
Used for passing data between threads.
Definition: dsddec.c:67
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:345
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
double in_min
#define B
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
static const AVFilterPad colorlevels_outputs[]
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;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);return NULL;}return ac;}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;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->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);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
#define LOAD_COMMON
Filter definition.
Definition: avfilter.h:145
double out_max
packed BGR 8:8:8, 32bpp, BGRXBGRX... X=unused/undefined
Definition: pixfmt.h:240
const char * name
Filter name.
Definition: avfilter.h:149
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:353
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:303
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:381
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:328
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
int
#define OFFSET(x)
avfilter_execute_func * execute
Definition: internal.h:136
static int colorlevels_slice_16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2033
#define av_clip_uint8
Definition: common.h:128
double in_max
AVFilter ff_vf_colorlevels
A list of supported formats for one end of a filter link.
Definition: formats.h:65
static const double coeff[2][5]
Definition: vf_owdenoise.c:73
#define lrint
Definition: tablegen.h:53
An instance of a filter.
Definition: avfilter.h:341
#define R
FILE * out
Definition: movenc.c:54
AVFILTER_DEFINE_CLASS(colorlevels)
internal API functions
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
int depth
Number of bits in the component.
Definition: pixdesc.h:58
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:237
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
int src_linesize
Definition: vf_bm3d.c:57
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:658
int i
Definition: input.c:407
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step