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FFmpeg/libavfilter/vf_smartblur.c
2012-11-29 12:49:03 +01:00

315 lines
10 KiB
C

/*
* 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.
*/
#include "libavutil/pixdesc.h"
#include "libswscale/swscale.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#define RADIUS_MIN 0.1
#define RADIUS_MAX 5.0
#define STRENGTH_MIN -1.0
#define STRENGTH_MAX 1.0
#define THRESHOLD_MIN -30
#define THRESHOLD_MAX 30
typedef struct {
float radius;
float strength;
int threshold;
float quality;
struct SwsContext *filter_context;
} FilterParam;
typedef struct {
FilterParam luma;
FilterParam chroma;
int hsub;
int vsub;
unsigned int sws_flags;
} SmartblurContext;
#define CHECK_PARAM(param, name, min, max, format, ret) \
if (param < min || param > max) { \
av_log(ctx, AV_LOG_ERROR, \
"Invalid " #name " value " #format ": " \
"must be included between range " #format " and " #format "\n",\
param, min, max); \
ret = AVERROR(EINVAL); \
}
static av_cold int init(AVFilterContext *ctx, const char *args)
{
SmartblurContext *sblur = ctx->priv;
int n = 0, ret = 0;
float lradius, lstrength, cradius, cstrength;
int lthreshold, cthreshold;
if (args)
n = sscanf(args, "%f:%f:%d:%f:%f:%d",
&lradius, &lstrength, &lthreshold,
&cradius, &cstrength, &cthreshold);
if (n != 3 && n != 6) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect number of parameters or invalid syntax: "
"must be luma_radius:luma_strength:luma_threshold"
"[:chroma_radius:chroma_strength:chroma_threshold]\n");
return AVERROR(EINVAL);
}
sblur->luma.radius = lradius;
sblur->luma.strength = lstrength;
sblur->luma.threshold = lthreshold;
if (n == 3) {
sblur->chroma.radius = sblur->luma.radius;
sblur->chroma.strength = sblur->luma.strength;
sblur->chroma.threshold = sblur->luma.threshold;
} else {
sblur->chroma.radius = cradius;
sblur->chroma.strength = cstrength;
sblur->chroma.threshold = cthreshold;
}
sblur->luma.quality = sblur->chroma.quality = 3.0;
sblur->sws_flags = SWS_BICUBIC;
CHECK_PARAM(lradius, luma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
CHECK_PARAM(lstrength, luma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d, ret)
if (n != 3) {
CHECK_PARAM(sblur->chroma.radius, chroma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
CHECK_PARAM(sblur->chroma.strength, chroma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d, ret)
}
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SmartblurContext *sblur = ctx->priv;
sws_freeContext(sblur->luma.filter_context);
sws_freeContext(sblur->chroma.filter_context);
}
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
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
{
SwsVector *vec;
SwsFilter sws_filter;
vec = sws_getGaussianVec(f->radius, f->quality);
if (!vec)
return AVERROR(EINVAL);
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);
sws_freeVec(vec);
if (!f->filter_context)
return AVERROR(EINVAL);
return 0;
}
static int config_props(AVFilterLink *inlink)
{
SmartblurContext *sblur = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
sblur->hsub = desc->log2_chroma_w;
sblur->vsub = desc->log2_chroma_h;
alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags);
alloc_sws_context(&sblur->chroma,
inlink->w >> sblur->hsub, inlink->h >> sblur->vsub,
sblur->sws_flags);
return 0;
}
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};
sws_scale(filter_context, src_array, src_linesize_array,
0, h, dst_array, dst_linesize_array);
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;
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;
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;
}
}
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic)
{
SmartblurContext *sblur = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *outpic;
int cw = inlink->w >> sblur->hsub;
int ch = inlink->h >> sblur->vsub;
outpic = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
if (!outpic) {
avfilter_unref_bufferp(&inpic);
return AVERROR(ENOMEM);
}
avfilter_copy_buffer_ref_props(outpic, inpic);
blur(outpic->data[0], outpic->linesize[0],
inpic->data[0], inpic->linesize[0],
inlink->w, inlink->h, sblur->luma.threshold,
sblur->luma.filter_context);
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);
}
avfilter_unref_bufferp(&inpic);
return ff_filter_frame(outlink, outpic);
}
static const AVFilterPad smartblur_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
.min_perms = AV_PERM_READ,
},
{ NULL }
};
static const AVFilterPad smartblur_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
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,
};