/*
* Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
* Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
* Relicensed to the LGPL with permission from Remi Guyomarch.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
* blur / sharpen filter, ported to FFmpeg from MPlayer
* libmpcodecs/unsharp.c.
*
* This code is based on:
*
* An Efficient algorithm for Gaussian blur using finite-state machines
* Frederick M. Waltz and John W. V. Miller
*
* SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
* Originally published Boston, Nov 98
*
* http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
*/
#include <float.h> /* DBL_MAX */
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#define MIN_MATRIX_SIZE 3
#define MAX_MATRIX_SIZE 63
/* right-shift and round-up */
#define SHIFTUP(x,shift) (-((-(x))>>(shift)))
typedef struct FilterParam {
int msize_x; ///< matrix width
int msize_y; ///< matrix height
int amount; ///< effect amount
int steps_x; ///< horizontal step count
int steps_y; ///< vertical step count
int scalebits; ///< bits to shift pixel
int32_t halfscale; ///< amount to add to pixel
uint32_t *sc[MAX_MATRIX_SIZE - 1]; ///< finite state machine storage
} FilterParam;
typedef struct {
const AVClass *class;
FilterParam luma; ///< luma parameters (width, height, amount)
FilterParam chroma; ///< chroma parameters (width, height, amount)
int hsub, vsub;
int luma_msize_x, luma_msize_y, chroma_msize_x, chroma_msize_y;
double luma_amount, chroma_amount;
} UnsharpContext;
#define OFFSET(x) offsetof(UnsharpContext, x)
static const AVOption unsharp_options[] = {
{ "luma_msize_x", "set luma matrix x size", OFFSET(luma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "lx", "set luma matrix x size", OFFSET(luma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "luma_msize_y", "set luma matrix y size", OFFSET(luma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "ly", "set luma matrix y size", OFFSET(luma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "luma_amount", "set luma effect amount", OFFSET(luma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX },
{ "la", "set luma effect amount", OFFSET(luma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=1.0}, -DBL_MAX, DBL_MAX },
{ "chroma_msize_x", "set chroma matrix x size", OFFSET(chroma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "cx", "set chroma matrix x size", OFFSET(chroma_msize_x), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "chroma_msize_y", "set chroma matrix y size", OFFSET(chroma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "cy" , "set chroma matrix y size", OFFSET(chroma_msize_y), AV_OPT_TYPE_INT, {.i64=5}, 3, 63 },
{ "chroma_amount", "set chroma effect strenght", OFFSET(chroma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX },
{ "ca", "set chroma effect strenght", OFFSET(chroma_amount), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -DBL_MAX, DBL_MAX },
{ NULL }
};
AVFILTER_DEFINE_CLASS(unsharp);
static void apply_unsharp( uint8_t *dst, int dst_stride,
const uint8_t *src, int src_stride,
int width, int height, FilterParam *fp)
{
uint32_t **sc = fp->sc;
uint32_t sr[MAX_MATRIX_SIZE - 1], tmp1, tmp2;
int32_t res;
int x, y, z;
const uint8_t *src2 = NULL; //silence a warning
const int amount = fp->amount;
const int steps_x = fp->steps_x;
const int steps_y = fp->steps_y;
const int scalebits = fp->scalebits;
const int32_t halfscale = fp->halfscale;
if (!amount) {
if (dst_stride == src_stride)
memcpy(dst, src, src_stride * height);
else
for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
memcpy(dst, src, width);
return;
}
for (y = 0; y < 2 * steps_y; y++)
memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * steps_x));
for (y = -steps_y; y < height + steps_y; y++) {
if (y < height)
src2 = src;
memset(sr, 0, sizeof(sr[0]) * (2 * steps_x - 1));
for (x = -steps_x; x < width + steps_x; x++) {
tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
for (z = 0; z < steps_x * 2; z += 2) {
tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
}
for (z = 0; z < steps_y * 2; z += 2) {
tmp2 = sc[z + 0][x + steps_x] + tmp1; sc[z + 0][x + steps_x] = tmp1;
tmp1 = sc[z + 1][x + steps_x] + tmp2; sc[z + 1][x + steps_x] = tmp2;
}
if (x >= steps_x && y >= steps_y) {
const uint8_t *srx = src - steps_y * src_stride + x - steps_x;
uint8_t *dsx = dst - steps_y * dst_stride + x - steps_x;
res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + halfscale) >> scalebits)) * amount) >> 16);
*dsx = av_clip_uint8(res);
}
}
if (y >= 0) {
dst += dst_stride;
src += src_stride;
}
}
}
static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
{
fp->msize_x = msize_x;
fp->msize_y = msize_y;
fp->amount = amount * 65536.0;
fp->steps_x = msize_x / 2;
fp->steps_y = msize_y / 2;
fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
fp->halfscale = 1 << (fp->scalebits - 1);
}
static av_cold int init(AVFilterContext *ctx, const char *args)
{
UnsharpContext *unsharp = ctx->priv;
static const char *shorthand[] = {
"luma_msize_x", "luma_msize_y", "luma_amount",
"chroma_msize_x", "chroma_msize_y", "chroma_amount",
NULL
};
int ret;
unsharp->class = &unsharp_class;
av_opt_set_defaults(unsharp);
if ((ret = av_opt_set_from_string(unsharp, args, shorthand, "=", ":")) < 0)
return ret;
set_filter_param(&unsharp->luma, unsharp->luma_msize_x, unsharp->luma_msize_y, unsharp->luma_amount);
set_filter_param(&unsharp->chroma, unsharp->chroma_msize_x, unsharp->chroma_msize_y, unsharp->chroma_amount);
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
{
int z;
const char *effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
if (!(fp->msize_x & fp->msize_y & 1)) {
av_log(ctx, AV_LOG_ERROR,
"Invalid even size for %s matrix size %dx%d\n",
effect_type, fp->msize_x, fp->msize_y);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
for (z = 0; z < 2 * fp->steps_y; z++)
if (!(fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x))))
return AVERROR(ENOMEM);
return 0;
}
static int config_props(AVFilterLink *link)
{
UnsharpContext *unsharp = link->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
int ret;
unsharp->hsub = desc->log2_chroma_w;
unsharp->vsub = desc->log2_chroma_h;
ret = init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
if (ret < 0)
return ret;
ret = init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));
if (ret < 0)
return ret;
return 0;
}
static void free_filter_param(FilterParam *fp)
{
int z;
for (z = 0; z < 2 * fp->steps_y; z++)
av_free(fp->sc[z]);
}
static av_cold void uninit(AVFilterContext *ctx)
{
UnsharpContext *unsharp = ctx->priv;
free_filter_param(&unsharp->luma);
free_filter_param(&unsharp->chroma);
av_opt_free(unsharp);
}
static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in)
{
UnsharpContext *unsharp = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[0];
AVFilterBufferRef *out;
int cw = SHIFTUP(link->w, unsharp->hsub);
int ch = SHIFTUP(link->h, unsharp->vsub);
out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
if (!out) {
avfilter_unref_bufferp(&in);
return AVERROR(ENOMEM);
}
avfilter_copy_buffer_ref_props(out, in);
apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
avfilter_unref_bufferp(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad avfilter_vf_unsharp_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
.min_perms = AV_PERM_READ,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_unsharp_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_unsharp = {
.name = "unsharp",
.description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
.priv_size = sizeof(UnsharpContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = avfilter_vf_unsharp_inputs,
.outputs = avfilter_vf_unsharp_outputs,
.priv_class = &unsharp_class,
};