FFmpeg
vf_epx.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/opt.h"
20 #include "libavutil/pixdesc.h"
21 #include "internal.h"
22 #include "video.h"
23 
24 typedef struct EPXContext {
25  const AVClass *class;
26 
27  int n;
28 
29  int (*epx_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
30 } EPXContext;
31 
32 typedef struct ThreadData {
33  AVFrame *in, *out;
34 } ThreadData;
35 
36 #define OFFSET(x) offsetof(EPXContext, x)
37 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
38 static const AVOption epx_options[] = {
39  { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, .flags = FLAGS },
40  { NULL }
41 };
42 
43 AVFILTER_DEFINE_CLASS(epx);
44 
45 static int epx2_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
46 {
47  ThreadData *td = arg;
48  const AVFrame *in = td->in;
49  AVFrame *out = td->out;
50  const int slice_start = (in->height * jobnr ) / nb_jobs;
51  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
52 
53  for (int p = 0; p < 1; p++) {
54  const int width = in->width;
55  const int height = in->height;
56  const int src_linesize = in->linesize[p] / 4;
57  const int dst_linesize = out->linesize[p] / 4;
58  const uint32_t *src = (const uint32_t *)in->data[p];
59  uint32_t *dst = (uint32_t *)out->data[p];
60  const uint32_t *src_line[3];
61 
62  src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
63  src_line[1] = src + src_linesize * slice_start;
64  src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
65 
66  for (int y = slice_start; y < slice_end; y++) {
67  uint32_t *dst_line[2];
68 
69  dst_line[0] = dst + dst_linesize*2*y;
70  dst_line[1] = dst + dst_linesize*(2*y+1);
71 
72  for (int x = 0; x < width; x++) {
73  uint32_t E0, E1, E2, E3;
74  uint32_t B, D, E, F, H;
75 
76  B = src_line[0][x];
77  D = src_line[1][FFMAX(x-1, 0)];
78  E = src_line[1][x];
79  F = src_line[1][FFMIN(x+1, width - 1)];
80  H = src_line[2][x];
81 
82  if (B != H && D != F) {
83  E0 = D == B ? D : E;
84  E1 = B == F ? F : E;
85  E2 = D == H ? D : E;
86  E3 = H == F ? F : E;
87  } else {
88  E0 = E;
89  E1 = E;
90  E2 = E;
91  E3 = E;
92  }
93 
94  dst_line[0][x*2] = E0;
95  dst_line[0][x*2+1] = E1;
96  dst_line[1][x*2] = E2;
97  dst_line[1][x*2+1] = E3;
98  }
99 
100  src_line[0] = src_line[1];
101  src_line[1] = src_line[2];
102  src_line[2] = src_line[1];
103 
104  if (y < height - 2)
105  src_line[2] += src_linesize;
106  }
107  }
108 
109  return 0;
110 }
111 
112 static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
113 {
114  ThreadData *td = arg;
115  const AVFrame *in = td->in;
116  AVFrame *out = td->out;
117  const int slice_start = (in->height * jobnr ) / nb_jobs;
118  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
119 
120  for (int p = 0; p < 1; p++) {
121  const int width = in->width;
122  const int height = in->height;
123  const int src_linesize = in->linesize[p] / 4;
124  const int dst_linesize = out->linesize[p] / 4;
125  const uint32_t *src = (const uint32_t *)in->data[p];
126  uint32_t *dst = (uint32_t *)out->data[p];
127  const uint32_t *src_line[3];
128 
129  src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
130  src_line[1] = src + src_linesize * slice_start;
131  src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
132 
133  for (int y = slice_start; y < slice_end; y++) {
134  uint32_t *dst_line[3];
135 
136  dst_line[0] = dst + dst_linesize*3*y;
137  dst_line[1] = dst + dst_linesize*(3*y+1);
138  dst_line[2] = dst + dst_linesize*(3*y+2);
139 
140  for (int x = 0; x < width; x++) {
141  uint32_t E0, E1, E2, E3, E4, E5, E6, E7, E8;
142  uint32_t A, B, C, D, E, F, G, H, I;
143 
144  A = src_line[0][FFMAX(x-1, 0)];
145  B = src_line[0][x];
146  C = src_line[0][FFMIN(x+1, width - 1)];
147  D = src_line[1][FFMAX(x-1, 0)];
148  E = src_line[1][x];
149  F = src_line[1][FFMIN(x+1, width - 1)];
150  G = src_line[2][FFMAX(x-1, 0)];
151  H = src_line[2][x];
152  I = src_line[2][FFMIN(x+1, width - 1)];
153 
154  if (B != H && D != F) {
155  E0 = D == B ? D : E;
156  E1 = (D == B && E != C) || (B == F && E != A) ? B : E;
157  E2 = B == F ? F : E;
158  E3 = (D == B && E != G) || (D == H && E != A) ? D : E;
159  E4 = E;
160  E5 = (B == F && E != I) || (H == F && E != C) ? F : E;
161  E6 = D == H ? D : E;
162  E7 = (D == H && E != I) || (H == F && E != G) ? H : E;
163  E8 = H == F ? F : E;
164  } else {
165  E0 = E;
166  E1 = E;
167  E2 = E;
168  E3 = E;
169  E4 = E;
170  E5 = E;
171  E6 = E;
172  E7 = E;
173  E8 = E;
174  }
175 
176  dst_line[0][x*3] = E0;
177  dst_line[0][x*3+1] = E1;
178  dst_line[0][x*3+2] = E2;
179  dst_line[1][x*3] = E3;
180  dst_line[1][x*3+1] = E4;
181  dst_line[1][x*3+2] = E5;
182  dst_line[2][x*3] = E6;
183  dst_line[2][x*3+1] = E7;
184  dst_line[2][x*3+2] = E8;
185  }
186 
187  src_line[0] = src_line[1];
188  src_line[1] = src_line[2];
189  src_line[2] = src_line[1];
190 
191  if (y < height - 2)
192  src_line[2] += src_linesize;
193  }
194  }
195 
196  return 0;
197 }
198 
199 static int config_output(AVFilterLink *outlink)
200 {
201  AVFilterContext *ctx = outlink->src;
202  EPXContext *s = ctx->priv;
203  AVFilterLink *inlink = ctx->inputs[0];
204  const AVPixFmtDescriptor *desc;
205 
206  desc = av_pix_fmt_desc_get(outlink->format);
207  if (!desc)
208  return AVERROR_BUG;
209 
210  outlink->w = inlink->w * s->n;
211  outlink->h = inlink->h * s->n;
212 
213  switch (s->n) {
214  case 2:
215  s->epx_slice = epx2_slice;
216  break;
217  case 3:
218  s->epx_slice = epx3_slice;
219  break;
220  }
221 
222  return 0;
223 }
224 
225 static const enum AVPixelFormat pix_fmts[] = {
226  AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
227  AV_PIX_FMT_NONE,
228 };
229 
230 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
231 {
232  AVFilterContext *ctx = inlink->dst;
233  AVFilterLink *outlink = ctx->outputs[0];
234  EPXContext *s = ctx->priv;
235  ThreadData td;
236 
237  AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
238  if (!out) {
239  av_frame_free(&in);
240  return AVERROR(ENOMEM);
241  }
242 
243  av_frame_copy_props(out, in);
244 
245  td.in = in, td.out = out;
246  ff_filter_execute(ctx, s->epx_slice, &td, NULL,
247  FFMIN(inlink->h, ff_filter_get_nb_threads(ctx)));
248 
249  av_frame_free(&in);
250  return ff_filter_frame(outlink, out);
251 }
252 
253 static const AVFilterPad inputs[] = {
254  {
255  .name = "default",
256  .type = AVMEDIA_TYPE_VIDEO,
257  .filter_frame = filter_frame,
258  },
259 };
260 
261 static const AVFilterPad outputs[] = {
262  {
263  .name = "default",
264  .type = AVMEDIA_TYPE_VIDEO,
265  .config_props = config_output,
266  },
267 };
268 
269 const AVFilter ff_vf_epx = {
270  .name = "epx",
271  .description = NULL_IF_CONFIG_SMALL("Scale the input using EPX algorithm."),
272  FILTER_INPUTS(inputs),
273  FILTER_OUTPUTS(outputs),
274  FILTER_PIXFMTS_ARRAY(pix_fmts),
275  .priv_size = sizeof(EPXContext),
276  .priv_class = &epx_class,
277  .flags = AVFILTER_FLAG_SLICE_THREADS,
278 };
E4
#define E4(a, b)
Definition: indeo3data.h: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
A
#define A(x)
Definition: vpx_arith.h:28
td
#define td
Definition: regdef.h:70
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
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
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2962
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_epx.c:230
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:130
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
pixdesc.h
AVFrame::width
int width
Definition: frame.h:416
AVOption
AVOption.
Definition: opt.h:346
F
#define F(x)
AV_PIX_FMT_BGRA
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:102
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:526
video.h
ThreadData::in
AVFrame * in
Definition: af_adecorrelate.c:153
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:365
D
D(D(float, sse)
Definition: rematrix_init.c:29
epx3_slice
static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_epx.c:112
epx_options
static const AVOption epx_options[]
Definition: vf_epx.c:38
outputs
static const AVFilterPad outputs[]
Definition: vf_epx.c:261
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: vf_epx.c:225
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
C
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
Definition: writing_filters.txt:58
slice_start
static int slice_start(SliceContext *sc, VVCContext *s, VVCFrameContext *fc, const CodedBitstreamUnit *unit, const int is_first_slice)
Definition: vvcdec.c:694
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:198
E1
#define E1(x)
Definition: mem_internal.h:123
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:1725
B
#define B
Definition: huffyuv.h:42
ctx
AVFormatContext * ctx
Definition: movenc.c:48
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
E
#define E
Definition: avdct.c:32
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:100
arg
const char * arg
Definition: jacosubdec.c:67
ff_vf_epx
const AVFilter ff_vf_epx
Definition: vf_epx.c:269
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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:679
EPXContext
Definition: vf_epx.c:24
OFFSET
#define OFFSET(x)
Definition: vf_epx.c:36
AV_PIX_FMT_ABGR
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:101
EPXContext::n
int n
Definition: vf_epx.c:27
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:106
height
#define height
H
#define H
Definition: pixlet.c:38
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_epx.c:199
internal.h
AV_PIX_FMT_ARGB
@ AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:99
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(epx)
epx2_slice
static int epx2_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_epx.c:45
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:825
ThreadData
Used for passing data between threads.
Definition: dsddec.c:69
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
E2
#define E2(a, b)
Expand a pair of delta values (a,b) into two/four delta entries.
Definition: indeo3data.h:250
AVFilter
Filter definition.
Definition: avfilter.h:166
inputs
static const AVFilterPad inputs[]
Definition: vf_epx.c:253
AVFrame::height
int height
Definition: frame.h:416
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:235
G
#define G
Definition: huffyuv.h:43
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
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:117
desc
const char * desc
Definition: libsvtav1.c:75
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
FLAGS
#define FLAGS
Definition: vf_epx.c:37
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
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:389
EPXContext::epx_slice
int(* epx_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_epx.c:29
ff_filter_execute
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
Definition: internal.h:134
int
int
Definition: ffmpeg_filter.c:409
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