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/* |
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
* Copyright (c) 2012 Jeremy Tran |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or modify |
* it under the terms of the GNU General Public License as published by |
* the Free Software Foundation; either version 2 of the License, or |
* (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
* GNU General Public License for more details. |
* |
* You should have received a copy of the GNU General Public License along |
* with FFmpeg; if not, write to the Free Software Foundation, Inc., |
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
*/ |
|
/** |
* @file |
* Apply a smartblur filter to the input video |
* Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer. |
*/ |
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#include "libavutil/opt.h" |
#include "libavutil/pixdesc.h" |
#include "libswscale/swscale.h" |
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#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
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#define RADIUS_MIN 0.1 |
#define RADIUS_MAX 5.0 |
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#define STRENGTH_MIN -1.0 |
#define STRENGTH_MAX 1.0 |
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#define THRESHOLD_MIN -30 |
#define THRESHOLD_MAX 30 |
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typedef struct { |
float radius; |
float strength; |
int threshold; |
float quality; |
struct SwsContext *filter_context; |
} FilterParam; |
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typedef struct { |
const AVClass *class; |
FilterParam luma; |
FilterParam chroma; |
int hsub; |
int vsub; |
unsigned int sws_flags; |
} SmartblurContext; |
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#define OFFSET(x) offsetof(SmartblurContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption smartblur_options[] = { |
{ "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
{ "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
{ "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
{ "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
{ "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
{ "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
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{ "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
{ "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
{ "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
{ "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
{ "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
{ "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
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{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(smartblur); |
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static av_cold int init(AVFilterContext *ctx) |
{ |
SmartblurContext *sblur = ctx->priv; |
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/* make chroma default to luma values, if not explicitly set */ |
if (sblur->chroma.radius < RADIUS_MIN) |
sblur->chroma.radius = sblur->luma.radius; |
if (sblur->chroma.strength < STRENGTH_MIN) |
sblur->chroma.strength = sblur->luma.strength; |
if (sblur->chroma.threshold < THRESHOLD_MIN) |
sblur->chroma.threshold = sblur->luma.threshold; |
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sblur->luma.quality = sblur->chroma.quality = 3.0; |
sblur->sws_flags = SWS_BICUBIC; |
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av_log(ctx, AV_LOG_VERBOSE, |
"luma_radius:%f luma_strength:%f luma_threshold:%d " |
"chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n", |
sblur->luma.radius, sblur->luma.strength, sblur->luma.threshold, |
sblur->chroma.radius, sblur->chroma.strength, sblur->chroma.threshold); |
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return 0; |
} |
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static av_cold void uninit(AVFilterContext *ctx) |
{ |
SmartblurContext *sblur = ctx->priv; |
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sws_freeContext(sblur->luma.filter_context); |
sws_freeContext(sblur->chroma.filter_context); |
} |
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static int query_formats(AVFilterContext *ctx) |
{ |
static const enum AVPixelFormat pix_fmts[] = { |
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
AV_PIX_FMT_GRAY8, |
AV_PIX_FMT_NONE |
}; |
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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return 0; |
} |
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static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags) |
{ |
SwsVector *vec; |
SwsFilter sws_filter; |
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vec = sws_getGaussianVec(f->radius, f->quality); |
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if (!vec) |
return AVERROR(EINVAL); |
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sws_scaleVec(vec, f->strength); |
vec->coeff[vec->length / 2] += 1.0 - f->strength; |
sws_filter.lumH = sws_filter.lumV = vec; |
sws_filter.chrH = sws_filter.chrV = NULL; |
f->filter_context = sws_getCachedContext(NULL, |
width, height, AV_PIX_FMT_GRAY8, |
width, height, AV_PIX_FMT_GRAY8, |
flags, &sws_filter, NULL, NULL); |
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sws_freeVec(vec); |
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if (!f->filter_context) |
return AVERROR(EINVAL); |
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return 0; |
} |
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static int config_props(AVFilterLink *inlink) |
{ |
SmartblurContext *sblur = inlink->dst->priv; |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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sblur->hsub = desc->log2_chroma_w; |
sblur->vsub = desc->log2_chroma_h; |
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alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags); |
alloc_sws_context(&sblur->chroma, |
FF_CEIL_RSHIFT(inlink->w, sblur->hsub), |
FF_CEIL_RSHIFT(inlink->h, sblur->vsub), |
sblur->sws_flags); |
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return 0; |
} |
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static void blur(uint8_t *dst, const int dst_linesize, |
const uint8_t *src, const int src_linesize, |
const int w, const int h, const int threshold, |
struct SwsContext *filter_context) |
{ |
int x, y; |
int orig, filtered; |
int diff; |
/* Declare arrays of 4 to get aligned data */ |
const uint8_t* const src_array[4] = {src}; |
uint8_t *dst_array[4] = {dst}; |
int src_linesize_array[4] = {src_linesize}; |
int dst_linesize_array[4] = {dst_linesize}; |
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sws_scale(filter_context, src_array, src_linesize_array, |
0, h, dst_array, dst_linesize_array); |
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if (threshold > 0) { |
for (y = 0; y < h; ++y) { |
for (x = 0; x < w; ++x) { |
orig = src[x + y * src_linesize]; |
filtered = dst[x + y * dst_linesize]; |
diff = orig - filtered; |
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if (diff > 0) { |
if (diff > 2 * threshold) |
dst[x + y * dst_linesize] = orig; |
else if (diff > threshold) |
/* add 'diff' and substract 'threshold' from 'filtered' */ |
dst[x + y * dst_linesize] = orig - threshold; |
} else { |
if (-diff > 2 * threshold) |
dst[x + y * dst_linesize] = orig; |
else if (-diff > threshold) |
/* add 'diff' and 'threshold' to 'filtered' */ |
dst[x + y * dst_linesize] = orig + threshold; |
} |
} |
} |
} else if (threshold < 0) { |
for (y = 0; y < h; ++y) { |
for (x = 0; x < w; ++x) { |
orig = src[x + y * src_linesize]; |
filtered = dst[x + y * dst_linesize]; |
diff = orig - filtered; |
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if (diff > 0) { |
if (diff <= -threshold) |
dst[x + y * dst_linesize] = orig; |
else if (diff <= -2 * threshold) |
/* substract 'diff' and 'threshold' from 'orig' */ |
dst[x + y * dst_linesize] = filtered - threshold; |
} else { |
if (diff >= threshold) |
dst[x + y * dst_linesize] = orig; |
else if (diff >= 2 * threshold) |
/* add 'threshold' and substract 'diff' from 'orig' */ |
dst[x + y * dst_linesize] = filtered + threshold; |
} |
} |
} |
} |
} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
{ |
SmartblurContext *sblur = inlink->dst->priv; |
AVFilterLink *outlink = inlink->dst->outputs[0]; |
AVFrame *outpic; |
int cw = FF_CEIL_RSHIFT(inlink->w, sblur->hsub); |
int ch = FF_CEIL_RSHIFT(inlink->h, sblur->vsub); |
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outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
if (!outpic) { |
av_frame_free(&inpic); |
return AVERROR(ENOMEM); |
} |
av_frame_copy_props(outpic, inpic); |
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blur(outpic->data[0], outpic->linesize[0], |
inpic->data[0], inpic->linesize[0], |
inlink->w, inlink->h, sblur->luma.threshold, |
sblur->luma.filter_context); |
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if (inpic->data[2]) { |
blur(outpic->data[1], outpic->linesize[1], |
inpic->data[1], inpic->linesize[1], |
cw, ch, sblur->chroma.threshold, |
sblur->chroma.filter_context); |
blur(outpic->data[2], outpic->linesize[2], |
inpic->data[2], inpic->linesize[2], |
cw, ch, sblur->chroma.threshold, |
sblur->chroma.filter_context); |
} |
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av_frame_free(&inpic); |
return ff_filter_frame(outlink, outpic); |
} |
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static const AVFilterPad smartblur_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_props, |
}, |
{ NULL } |
}; |
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static const AVFilterPad smartblur_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
}, |
{ NULL } |
}; |
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AVFilter avfilter_vf_smartblur = { |
.name = "smartblur", |
.description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."), |
.priv_size = sizeof(SmartblurContext), |
.init = init, |
.uninit = uninit, |
.query_formats = query_formats, |
.inputs = smartblur_inputs, |
.outputs = smartblur_outputs, |
.priv_class = &smartblur_class, |
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
}; |