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 
22 #include "filters.h"
23 #include "video.h"
24 
25 typedef struct EPXContext {
26  const AVClass *class;
27 
28  int n;
29 
30  int (*epx_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
31 } EPXContext;
32 
33 typedef struct ThreadData {
34  AVFrame *in, *out;
35 } ThreadData;
36 
37 #define OFFSET(x) offsetof(EPXContext, x)
38 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
39 static const AVOption epx_options[] = {
40  { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, .flags = FLAGS },
41  { NULL }
42 };
43 
44 AVFILTER_DEFINE_CLASS(epx);
45 
46 static int epx2_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
47 {
48  ThreadData *td = arg;
49  const AVFrame *in = td->in;
50  AVFrame *out = td->out;
51  const int slice_start = (in->height * jobnr ) / nb_jobs;
52  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
53 
54  for (int p = 0; p < 1; p++) {
55  const int width = in->width;
56  const int height = in->height;
57  const int src_linesize = in->linesize[p] / 4;
58  const int dst_linesize = out->linesize[p] / 4;
59  const uint32_t *src = (const uint32_t *)in->data[p];
60  uint32_t *dst = (uint32_t *)out->data[p];
61  const uint32_t *src_line[3];
62 
63  src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
64  src_line[1] = src + src_linesize * slice_start;
65  src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
66 
67  for (int y = slice_start; y < slice_end; y++) {
68  uint32_t *dst_line[2];
69 
70  dst_line[0] = dst + dst_linesize*2*y;
71  dst_line[1] = dst + dst_linesize*(2*y+1);
72 
73  for (int x = 0; x < width; x++) {
74  uint32_t E0, E1, E2, E3;
75  uint32_t B, D, E, F, H;
76 
77  B = src_line[0][x];
78  D = src_line[1][FFMAX(x-1, 0)];
79  E = src_line[1][x];
80  F = src_line[1][FFMIN(x+1, width - 1)];
81  H = src_line[2][x];
82 
83  if (B != H && D != F) {
84  E0 = D == B ? D : E;
85  E1 = B == F ? F : E;
86  E2 = D == H ? D : E;
87  E3 = H == F ? F : E;
88  } else {
89  E0 = E;
90  E1 = E;
91  E2 = E;
92  E3 = E;
93  }
94 
95  dst_line[0][x*2] = E0;
96  dst_line[0][x*2+1] = E1;
97  dst_line[1][x*2] = E2;
98  dst_line[1][x*2+1] = E3;
99  }
100 
101  src_line[0] = src_line[1];
102  src_line[1] = src_line[2];
103  src_line[2] = src_line[1];
104 
105  if (y < height - 2)
106  src_line[2] += src_linesize;
107  }
108  }
109 
110  return 0;
111 }
112 
113 static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
114 {
115  ThreadData *td = arg;
116  const AVFrame *in = td->in;
117  AVFrame *out = td->out;
118  const int slice_start = (in->height * jobnr ) / nb_jobs;
119  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
120 
121  for (int p = 0; p < 1; p++) {
122  const int width = in->width;
123  const int height = in->height;
124  const int src_linesize = in->linesize[p] / 4;
125  const int dst_linesize = out->linesize[p] / 4;
126  const uint32_t *src = (const uint32_t *)in->data[p];
127  uint32_t *dst = (uint32_t *)out->data[p];
128  const uint32_t *src_line[3];
129 
130  src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
131  src_line[1] = src + src_linesize * slice_start;
132  src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
133 
134  for (int y = slice_start; y < slice_end; y++) {
135  uint32_t *dst_line[3];
136 
137  dst_line[0] = dst + dst_linesize*3*y;
138  dst_line[1] = dst + dst_linesize*(3*y+1);
139  dst_line[2] = dst + dst_linesize*(3*y+2);
140 
141  for (int x = 0; x < width; x++) {
142  uint32_t E0, E1, E2, E3, E4, E5, E6, E7, E8;
143  uint32_t A, B, C, D, E, F, G, H, I;
144 
145  A = src_line[0][FFMAX(x-1, 0)];
146  B = src_line[0][x];
147  C = src_line[0][FFMIN(x+1, width - 1)];
148  D = src_line[1][FFMAX(x-1, 0)];
149  E = src_line[1][x];
150  F = src_line[1][FFMIN(x+1, width - 1)];
151  G = src_line[2][FFMAX(x-1, 0)];
152  H = src_line[2][x];
153  I = src_line[2][FFMIN(x+1, width - 1)];
154 
155  if (B != H && D != F) {
156  E0 = D == B ? D : E;
157  E1 = (D == B && E != C) || (B == F && E != A) ? B : E;
158  E2 = B == F ? F : E;
159  E3 = (D == B && E != G) || (D == H && E != A) ? D : E;
160  E4 = E;
161  E5 = (B == F && E != I) || (H == F && E != C) ? F : E;
162  E6 = D == H ? D : E;
163  E7 = (D == H && E != I) || (H == F && E != G) ? H : E;
164  E8 = H == F ? F : E;
165  } else {
166  E0 = E;
167  E1 = E;
168  E2 = E;
169  E3 = E;
170  E4 = E;
171  E5 = E;
172  E6 = E;
173  E7 = E;
174  E8 = E;
175  }
176 
177  dst_line[0][x*3] = E0;
178  dst_line[0][x*3+1] = E1;
179  dst_line[0][x*3+2] = E2;
180  dst_line[1][x*3] = E3;
181  dst_line[1][x*3+1] = E4;
182  dst_line[1][x*3+2] = E5;
183  dst_line[2][x*3] = E6;
184  dst_line[2][x*3+1] = E7;
185  dst_line[2][x*3+2] = E8;
186  }
187 
188  src_line[0] = src_line[1];
189  src_line[1] = src_line[2];
190  src_line[2] = src_line[1];
191 
192  if (y < height - 2)
193  src_line[2] += src_linesize;
194  }
195  }
196 
197  return 0;
198 }
199 
200 static int config_output(AVFilterLink *outlink)
201 {
202  AVFilterContext *ctx = outlink->src;
203  EPXContext *s = ctx->priv;
204  AVFilterLink *inlink = ctx->inputs[0];
205  const AVPixFmtDescriptor *desc;
206 
207  desc = av_pix_fmt_desc_get(outlink->format);
208  if (!desc)
209  return AVERROR_BUG;
210 
211  outlink->w = inlink->w * s->n;
212  outlink->h = inlink->h * s->n;
213 
214  switch (s->n) {
215  case 2:
216  s->epx_slice = epx2_slice;
217  break;
218  case 3:
219  s->epx_slice = epx3_slice;
220  break;
221  }
222 
223  return 0;
224 }
225 
226 static const enum AVPixelFormat pix_fmts[] = {
227  AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
228  AV_PIX_FMT_NONE,
229 };
230 
231 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
232 {
233  AVFilterContext *ctx = inlink->dst;
234  AVFilterLink *outlink = ctx->outputs[0];
235  EPXContext *s = ctx->priv;
236  ThreadData td;
237 
238  AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
239  if (!out) {
240  av_frame_free(&in);
241  return AVERROR(ENOMEM);
242  }
243 
244  av_frame_copy_props(out, in);
245 
246  td.in = in, td.out = out;
247  ff_filter_execute(ctx, s->epx_slice, &td, NULL,
248  FFMIN(inlink->h, ff_filter_get_nb_threads(ctx)));
249 
250  av_frame_free(&in);
251  return ff_filter_frame(outlink, out);
252 }
253 
254 static const AVFilterPad inputs[] = {
255  {
256  .name = "default",
257  .type = AVMEDIA_TYPE_VIDEO,
258  .filter_frame = filter_frame,
259  },
260 };
261 
262 static const AVFilterPad outputs[] = {
263  {
264  .name = "default",
265  .type = AVMEDIA_TYPE_VIDEO,
266  .config_props = config_output,
267  },
268 };
269 
270 const AVFilter ff_vf_epx = {
271  .name = "epx",
272  .description = NULL_IF_CONFIG_SMALL("Scale the input using EPX algorithm."),
273  FILTER_INPUTS(inputs),
274  FILTER_OUTPUTS(outputs),
275  FILTER_PIXFMTS_ARRAY(pix_fmts),
276  .priv_size = sizeof(EPXContext),
277  .priv_class = &epx_class,
278  .flags = AVFILTER_FLAG_SLICE_THREADS,
279 };
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:116
A
#define A(x)
Definition: vpx_arith.h:28
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
FILTER_PIXFMTS_ARRAY
#define FILTER_PIXFMTS_ARRAY(array)
Definition: filters.h:242
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:1062
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3170
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_epx.c:231
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:162
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: filters.h:262
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:389
pixdesc.h
AVFrame::width
int width
Definition: frame.h:461
AVOption
AVOption.
Definition: opt.h:429
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:205
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:526
video.h
ThreadData::in
AVFrame * in
Definition: af_adecorrelate.c:155
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:410
D
D(D(float, sse)
Definition: rematrix_init.c:30
epx3_slice
static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_epx.c:113
epx_options
static const AVOption epx_options[]
Definition: vf_epx.c:39
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict, int *got_output)
Handle slice ends.
Definition: mpeg12dec.c:1719
outputs
static const AVFilterPad outputs[]
Definition: vf_epx.c:262
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: vf_epx.c:226
AVFilterPad
A filter pad used for either input or output.
Definition: filters.h:38
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
s
#define s(width, name)
Definition: cbs_vp9.c:198
E1
#define E1(x)
Definition: mem_internal.h:123
filters.h
B
#define B
Definition: huffyuv.h:42
ctx
AVFormatContext * ctx
Definition: movenc.c:49
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: filters.h:263
E
#define E
Definition: avdct.c:33
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:270
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
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:713
EPXContext
Definition: vf_epx.c:25
OFFSET
#define OFFSET(x)
Definition: vf_epx.c:37
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:28
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
height
#define height
Definition: dsp.h:85
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:83
H
#define H
Definition: pixlet.c:39
config_output
static int config_output(AVFilterLink *outlink)
Definition: vf_epx.c:200
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:46
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:841
ThreadData
Used for passing data between threads.
Definition: dsddec.c:71
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVFilterPad::name
const char * name
Pad name.
Definition: filters.h:44
E2
#define E2(a, b)
Expand a pair of delta values (a,b) into two/four delta entries.
Definition: indeo3data.h:250
slice_start
static int slice_start(SliceContext *sc, VVCContext *s, VVCFrameContext *fc, const CodedBitstreamUnit *unit, const int is_first_slice)
Definition: dec.c:738
AVFilter
Filter definition.
Definition: avfilter.h:201
inputs
static const AVFilterPad inputs[]
Definition: vf_epx.c:254
AVFrame::height
int height
Definition: frame.h:461
ff_filter_execute
int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
Definition: avfilter.c:1667
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
G
#define G
Definition: huffyuv.h:43
AVFilterContext
An instance of a filter.
Definition: avfilter.h:457
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:152
desc
const char * desc
Definition: libsvtav1.c:79
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
FLAGS
#define FLAGS
Definition: vf_epx.c:38
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:434
EPXContext::epx_slice
int(* epx_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_epx.c:30
width
#define width
Definition: dsp.h:85
src
#define src
Definition: vp8dsp.c:248
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