2 * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (c) 2012 Jeremy Tran
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
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
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 * Apply a smartblur filter to the input video
25 * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
28 #include "libavutil/opt.h"
29 #include "libavutil/pixdesc.h"
30 #include "libswscale/swscale.h"
36 #define RADIUS_MIN 0.1
37 #define RADIUS_MAX 5.0
39 #define STRENGTH_MIN -1.0
40 #define STRENGTH_MAX 1.0
42 #define THRESHOLD_MIN -30
43 #define THRESHOLD_MAX 30
50 struct SwsContext
*filter_context
;
59 unsigned int sws_flags
;
62 #define OFFSET(x) offsetof(SmartblurContext, x)
63 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
65 static const AVOption smartblur_options
[] = {
66 { "luma_radius", "set luma radius", OFFSET(luma
.radius
), AV_OPT_TYPE_FLOAT
, {.dbl
=1.0}, RADIUS_MIN
, RADIUS_MAX
, .flags
=FLAGS
},
67 { "lr" , "set luma radius", OFFSET(luma
.radius
), AV_OPT_TYPE_FLOAT
, {.dbl
=1.0}, RADIUS_MIN
, RADIUS_MAX
, .flags
=FLAGS
},
68 { "luma_strength", "set luma strength", OFFSET(luma
.strength
), AV_OPT_TYPE_FLOAT
, {.dbl
=1.0}, STRENGTH_MIN
, STRENGTH_MAX
, .flags
=FLAGS
},
69 { "ls", "set luma strength", OFFSET(luma
.strength
), AV_OPT_TYPE_FLOAT
, {.dbl
=1.0}, STRENGTH_MIN
, STRENGTH_MAX
, .flags
=FLAGS
},
70 { "luma_threshold", "set luma threshold", OFFSET(luma
.threshold
), AV_OPT_TYPE_INT
, {.i64
=0}, THRESHOLD_MIN
, THRESHOLD_MAX
, .flags
=FLAGS
},
71 { "lt", "set luma threshold", OFFSET(luma
.threshold
), AV_OPT_TYPE_INT
, {.i64
=0}, THRESHOLD_MIN
, THRESHOLD_MAX
, .flags
=FLAGS
},
73 { "chroma_radius", "set chroma radius", OFFSET(chroma
.radius
), AV_OPT_TYPE_FLOAT
, {.dbl
=RADIUS_MIN
-1}, RADIUS_MIN
-1, RADIUS_MAX
, .flags
=FLAGS
},
74 { "cr", "set chroma radius", OFFSET(chroma
.radius
), AV_OPT_TYPE_FLOAT
, {.dbl
=RADIUS_MIN
-1}, RADIUS_MIN
-1, RADIUS_MAX
, .flags
=FLAGS
},
75 { "chroma_strength", "set chroma strength", OFFSET(chroma
.strength
), AV_OPT_TYPE_FLOAT
, {.dbl
=STRENGTH_MIN
-1}, STRENGTH_MIN
-1, STRENGTH_MAX
, .flags
=FLAGS
},
76 { "cs", "set chroma strength", OFFSET(chroma
.strength
), AV_OPT_TYPE_FLOAT
, {.dbl
=STRENGTH_MIN
-1}, STRENGTH_MIN
-1, STRENGTH_MAX
, .flags
=FLAGS
},
77 { "chroma_threshold", "set chroma threshold", OFFSET(chroma
.threshold
), AV_OPT_TYPE_INT
, {.i64
=THRESHOLD_MIN
-1}, THRESHOLD_MIN
-1, THRESHOLD_MAX
, .flags
=FLAGS
},
78 { "ct", "set chroma threshold", OFFSET(chroma
.threshold
), AV_OPT_TYPE_INT
, {.i64
=THRESHOLD_MIN
-1}, THRESHOLD_MIN
-1, THRESHOLD_MAX
, .flags
=FLAGS
},
83 AVFILTER_DEFINE_CLASS(smartblur
);
85 static av_cold
int init(AVFilterContext
*ctx
)
87 SmartblurContext
*sblur
= ctx
->priv
;
89 /* make chroma default to luma values, if not explicitly set */
90 if (sblur
->chroma
.radius
< RADIUS_MIN
)
91 sblur
->chroma
.radius
= sblur
->luma
.radius
;
92 if (sblur
->chroma
.strength
< STRENGTH_MIN
)
93 sblur
->chroma
.strength
= sblur
->luma
.strength
;
94 if (sblur
->chroma
.threshold
< THRESHOLD_MIN
)
95 sblur
->chroma
.threshold
= sblur
->luma
.threshold
;
97 sblur
->luma
.quality
= sblur
->chroma
.quality
= 3.0;
98 sblur
->sws_flags
= SWS_BICUBIC
;
100 av_log(ctx
, AV_LOG_VERBOSE
,
101 "luma_radius:%f luma_strength:%f luma_threshold:%d "
102 "chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n",
103 sblur
->luma
.radius
, sblur
->luma
.strength
, sblur
->luma
.threshold
,
104 sblur
->chroma
.radius
, sblur
->chroma
.strength
, sblur
->chroma
.threshold
);
109 static av_cold
void uninit(AVFilterContext
*ctx
)
111 SmartblurContext
*sblur
= ctx
->priv
;
113 sws_freeContext(sblur
->luma
.filter_context
);
114 sws_freeContext(sblur
->chroma
.filter_context
);
117 static int query_formats(AVFilterContext
*ctx
)
119 static const enum AVPixelFormat pix_fmts
[] = {
120 AV_PIX_FMT_YUV444P
, AV_PIX_FMT_YUV422P
,
121 AV_PIX_FMT_YUV420P
, AV_PIX_FMT_YUV411P
,
122 AV_PIX_FMT_YUV410P
, AV_PIX_FMT_YUV440P
,
127 ff_set_common_formats(ctx
, ff_make_format_list(pix_fmts
));
132 static int alloc_sws_context(FilterParam
*f
, int width
, int height
, unsigned int flags
)
135 SwsFilter sws_filter
;
137 vec
= sws_getGaussianVec(f
->radius
, f
->quality
);
140 return AVERROR(EINVAL
);
142 sws_scaleVec(vec
, f
->strength
);
143 vec
->coeff
[vec
->length
/ 2] += 1.0 - f
->strength
;
144 sws_filter
.lumH
= sws_filter
.lumV
= vec
;
145 sws_filter
.chrH
= sws_filter
.chrV
= NULL
;
146 f
->filter_context
= sws_getCachedContext(NULL
,
147 width
, height
, AV_PIX_FMT_GRAY8
,
148 width
, height
, AV_PIX_FMT_GRAY8
,
149 flags
, &sws_filter
, NULL
, NULL
);
153 if (!f
->filter_context
)
154 return AVERROR(EINVAL
);
159 static int config_props(AVFilterLink
*inlink
)
161 SmartblurContext
*sblur
= inlink
->dst
->priv
;
162 const AVPixFmtDescriptor
*desc
= av_pix_fmt_desc_get(inlink
->format
);
164 sblur
->hsub
= desc
->log2_chroma_w
;
165 sblur
->vsub
= desc
->log2_chroma_h
;
167 alloc_sws_context(&sblur
->luma
, inlink
->w
, inlink
->h
, sblur
->sws_flags
);
168 alloc_sws_context(&sblur
->chroma
,
169 FF_CEIL_RSHIFT(inlink
->w
, sblur
->hsub
),
170 FF_CEIL_RSHIFT(inlink
->h
, sblur
->vsub
),
176 static void blur(uint8_t *dst
, const int dst_linesize
,
177 const uint8_t *src
, const int src_linesize
,
178 const int w
, const int h
, const int threshold
,
179 struct SwsContext
*filter_context
)
184 /* Declare arrays of 4 to get aligned data */
185 const uint8_t* const src_array
[4] = {src
};
186 uint8_t *dst_array
[4] = {dst
};
187 int src_linesize_array
[4] = {src_linesize
};
188 int dst_linesize_array
[4] = {dst_linesize
};
190 sws_scale(filter_context
, src_array
, src_linesize_array
,
191 0, h
, dst_array
, dst_linesize_array
);
194 for (y
= 0; y
< h
; ++y
) {
195 for (x
= 0; x
< w
; ++x
) {
196 orig
= src
[x
+ y
* src_linesize
];
197 filtered
= dst
[x
+ y
* dst_linesize
];
198 diff
= orig
- filtered
;
201 if (diff
> 2 * threshold
)
202 dst
[x
+ y
* dst_linesize
] = orig
;
203 else if (diff
> threshold
)
204 /* add 'diff' and subtract 'threshold' from 'filtered' */
205 dst
[x
+ y
* dst_linesize
] = orig
- threshold
;
207 if (-diff
> 2 * threshold
)
208 dst
[x
+ y
* dst_linesize
] = orig
;
209 else if (-diff
> threshold
)
210 /* add 'diff' and 'threshold' to 'filtered' */
211 dst
[x
+ y
* dst_linesize
] = orig
+ threshold
;
215 } else if (threshold
< 0) {
216 for (y
= 0; y
< h
; ++y
) {
217 for (x
= 0; x
< w
; ++x
) {
218 orig
= src
[x
+ y
* src_linesize
];
219 filtered
= dst
[x
+ y
* dst_linesize
];
220 diff
= orig
- filtered
;
223 if (diff
<= -threshold
)
224 dst
[x
+ y
* dst_linesize
] = orig
;
225 else if (diff
<= -2 * threshold
)
226 /* subtract 'diff' and 'threshold' from 'orig' */
227 dst
[x
+ y
* dst_linesize
] = filtered
- threshold
;
229 if (diff
>= threshold
)
230 dst
[x
+ y
* dst_linesize
] = orig
;
231 else if (diff
>= 2 * threshold
)
232 /* add 'threshold' and subtract 'diff' from 'orig' */
233 dst
[x
+ y
* dst_linesize
] = filtered
+ threshold
;
240 static int filter_frame(AVFilterLink
*inlink
, AVFrame
*inpic
)
242 SmartblurContext
*sblur
= inlink
->dst
->priv
;
243 AVFilterLink
*outlink
= inlink
->dst
->outputs
[0];
245 int cw
= FF_CEIL_RSHIFT(inlink
->w
, sblur
->hsub
);
246 int ch
= FF_CEIL_RSHIFT(inlink
->h
, sblur
->vsub
);
248 outpic
= ff_get_video_buffer(outlink
, outlink
->w
, outlink
->h
);
250 av_frame_free(&inpic
);
251 return AVERROR(ENOMEM
);
253 av_frame_copy_props(outpic
, inpic
);
255 blur(outpic
->data
[0], outpic
->linesize
[0],
256 inpic
->data
[0], inpic
->linesize
[0],
257 inlink
->w
, inlink
->h
, sblur
->luma
.threshold
,
258 sblur
->luma
.filter_context
);
260 if (inpic
->data
[2]) {
261 blur(outpic
->data
[1], outpic
->linesize
[1],
262 inpic
->data
[1], inpic
->linesize
[1],
263 cw
, ch
, sblur
->chroma
.threshold
,
264 sblur
->chroma
.filter_context
);
265 blur(outpic
->data
[2], outpic
->linesize
[2],
266 inpic
->data
[2], inpic
->linesize
[2],
267 cw
, ch
, sblur
->chroma
.threshold
,
268 sblur
->chroma
.filter_context
);
271 av_frame_free(&inpic
);
272 return ff_filter_frame(outlink
, outpic
);
275 static const AVFilterPad smartblur_inputs
[] = {
278 .type
= AVMEDIA_TYPE_VIDEO
,
279 .filter_frame
= filter_frame
,
280 .config_props
= config_props
,
285 static const AVFilterPad smartblur_outputs
[] = {
288 .type
= AVMEDIA_TYPE_VIDEO
,
293 AVFilter ff_vf_smartblur
= {
295 .description
= NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),
296 .priv_size
= sizeof(SmartblurContext
),
299 .query_formats
= query_formats
,
300 .inputs
= smartblur_inputs
,
301 .outputs
= smartblur_outputs
,
302 .priv_class
= &smartblur_class
,
303 .flags
= AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
,