/*
* Copyright (c) 2018 Paul B Mahol
*
* 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
*/
/*
* Based on paper: A Simple and Efficient Deblocking Algorithm for Low Bit-Rate Video Coding.
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
enum FilterType { WEAK, STRONG, NB_FILTER };
typedef struct DeblockContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
int filter;
int block;
int planes;
float alpha;
float beta;
float gamma;
float delta;
int ath;
int bth;
int gth;
int dth;
int max;
int depth;
int bpc;
int nb_planes;
int planewidth[4];
int planeheight[4];
void (*deblockh)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
int ath, int bth, int gth, int dth, int max);
void (*deblockv)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
int ath, int bth, int gth, int dth, int max);
} DeblockContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, formats);
}
#define WEAK_HFILTER(name, type, ldiv) \
static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
int ath, int bth, int gth, int dth, int max) \
{ \
type *dst; \
int x; \
\
dst = (type *)dstp; \
dst_linesize /= ldiv; \
\
for (x = 0; x < block; x++) { \
int delta = dst[x] - dst[x - dst_linesize]; \
int A, B, C, D, a, b, c, d; \
\
if (FFABS(delta) >= ath || \
FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth) \
continue; \
\
A = dst[x - 2 * dst_linesize]; \
B = dst[x - 1 * dst_linesize]; \
C = dst[x + 0 * dst_linesize]; \
D = dst[x + 1 * dst_linesize]; \
\
a = A + delta / 8; \
b = B + delta / 2; \
c = C - delta / 2; \
d = D - delta / 8; \
\
dst[x - 2 * dst_linesize] = av_clip(a, 0, max); \
dst[x - 1 * dst_linesize] = av_clip(b, 0, max); \
dst[x + 0 * dst_linesize] = av_clip(c, 0, max); \
dst[x + 1 * dst_linesize] = av_clip(d, 0, max); \
} \
}
WEAK_HFILTER(8, uint8_t, 1)
WEAK_HFILTER(16, uint16_t, 2)
#define WEAK_VFILTER(name, type, ldiv) \
static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
int ath, int bth, int gth, int dth, int max) \
{ \
type *dst; \
int y; \
\
dst = (type *)dstp; \
dst_linesize /= ldiv; \
\
for (y = 0; y < block; y++) { \
int delta = dst[0] - dst[-1]; \
int A, B, C, D, a, b, c, d; \
\
if (FFABS(delta) >= ath || \
FFABS(dst[-1] - dst[-2]) >= bth || \
FFABS(dst[0] - dst[1]) >= gth) \
continue; \
\
A = dst[-2]; \
B = dst[-1]; \
C = dst[+0]; \
D = dst[+1]; \
\
a = A + delta / 8; \
b = B + delta / 2; \
c = C - delta / 2; \
d = D - delta / 8; \
\
dst[-2] = av_clip(a, 0, max); \
dst[-1] = av_clip(b, 0, max); \
dst[+0] = av_clip(c, 0, max); \
dst[+1] = av_clip(d, 0, max); \
\
dst += dst_linesize; \
} \
}
WEAK_VFILTER(8, uint8_t, 1)
WEAK_VFILTER(16, uint16_t, 2)
#define STRONG_HFILTER(name, type, ldiv) \
static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
int ath, int bth, int gth, int dth, int max) \
{ \
type *dst; \
int x; \
\
dst = (type *)dstp; \
dst_linesize /= ldiv; \
\
for (x = 0; x < block; x++) { \
int A, B, C, D, E, F, a, b, c, d, e, f; \
int delta = dst[x] - dst[x - dst_linesize]; \
\
if (FFABS(delta) >= ath || \
FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth) \
continue; \
\
A = dst[x - 3 * dst_linesize]; \
B = dst[x - 2 * dst_linesize]; \
C = dst[x - 1 * dst_linesize]; \
D = dst[x + 0 * dst_linesize]; \
E = dst[x + 1 * dst_linesize]; \
F = dst[x + 2 * dst_linesize]; \
\
a = A + delta / 8; \
b = B + delta / 4; \
c = C + delta / 2; \
d = D - delta / 2; \
e = E - delta / 4; \
f = F - delta / 8; \
\
dst[x - 3 * dst_linesize] = av_clip(a, 0, max); \
dst[x - 2 * dst_linesize] = av_clip(b, 0, max); \
dst[x - 1 * dst_linesize] = av_clip(c, 0, max); \
dst[x + 0 * dst_linesize] = av_clip(d, 0, max); \
dst[x + 1 * dst_linesize] = av_clip(e, 0, max); \
dst[x + 2 * dst_linesize] = av_clip(f, 0, max); \
} \
}
STRONG_HFILTER(8, uint8_t, 1)
STRONG_HFILTER(16, uint16_t, 2)
#define STRONG_VFILTER(name, type, ldiv) \
static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
int ath, int bth, int gth, int dth, int max) \
{ \
type *dst; \
int y; \
\
dst = (type *)dstp; \
dst_linesize /= ldiv; \
\
for (y = 0; y < block; y++) { \
int A, B, C, D, E, F, a, b, c, d, e, f; \
int delta = dst[0] - dst[-1]; \
\
if (FFABS(delta) >= ath || \
FFABS(dst[-1] - dst[-2]) >= bth || \
FFABS(dst[+1] - dst[+2]) >= gth || \
FFABS(dst[+0] - dst[+1]) >= dth) \
continue; \
\
A = dst[-3]; \
B = dst[-2]; \
C = dst[-1]; \
D = dst[+0]; \
E = dst[+1]; \
F = dst[+2]; \
\
a = A + delta / 8; \
b = B + delta / 4; \
c = C + delta / 2; \
d = D - delta / 2; \
e = E - delta / 4; \
f = F - delta / 8; \
\
dst[-3] = av_clip(a, 0, max); \
dst[-2] = av_clip(b, 0, max); \
dst[-1] = av_clip(c, 0, max); \
dst[+0] = av_clip(d, 0, max); \
dst[+1] = av_clip(e, 0, max); \
dst[+2] = av_clip(f, 0, max); \
\
dst += dst_linesize; \
} \
}
STRONG_VFILTER(8, uint8_t, 1)
STRONG_VFILTER(16, uint16_t, 2)
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
DeblockContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
s->desc = av_pix_fmt_desc_get(outlink->format);
if (!s->desc)
return AVERROR_BUG;
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
s->depth = s->desc->comp[0].depth;
s->bpc = (s->depth + 7) / 8;
s->max = (1 << s->depth) - 1;
s->ath = s->alpha * s->max;
s->bth = s->beta * s->max;
s->gth = s->gamma * s->max;
s->dth = s->delta * s->max;
if (s->depth <= 8 && s->filter == WEAK) {
s->deblockh = deblockh8_weak;
s->deblockv = deblockv8_weak;
} else if (s->depth >= 8 && s->filter == WEAK) {
s->deblockh = deblockh16_weak;
s->deblockv = deblockv16_weak;
}
if (s->depth <= 8 && s->filter == STRONG) {
s->deblockh = deblockh8_strong;
s->deblockv = deblockv8_strong;
} else if (s->depth >= 8 && s->filter == STRONG) {
s->deblockh = deblockh16_strong;
s->deblockv = deblockv16_strong;
}
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DeblockContext *s = ctx->priv;
const int block = s->block;
AVFrame *out;
int plane, x, y;
if (av_frame_is_writable(in)) {
out = in;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
for (plane = 0; plane < s->nb_planes; plane++) {
const int width = s->planewidth[plane];
const int height = s->planeheight[plane];
const uint8_t *src = (const uint8_t *)in->data[plane];
uint8_t *dst = (uint8_t *)out->data[plane];
if (in != out)
av_image_copy_plane(dst, out->linesize[plane],
src, in->linesize[plane],
width * s->bpc, height);
if (!((1 << plane) & s->planes))
continue;
for (x = block; x < width; x += block)
s->deblockv(dst + x * s->bpc, out->linesize[plane],
FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
for (y = block; y < height; y += block) {
dst += out->linesize[plane] * block;
s->deblockh(dst, out->linesize[plane],
FFMIN(block, width),
s->ath, s->bth, s->gth, s->dth, s->max);
for (x = block; x < width; x += block) {
s->deblockh(dst + x * s->bpc, out->linesize[plane],
FFMIN(block, width - x),
s->ath, s->bth, s->gth, s->dth, s->max);
s->deblockv(dst + x * s->bpc, out->linesize[plane],
FFMIN(block, height - y),
s->ath, s->bth, s->gth, s->dth, s->max);
}
}
}
if (in != out)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
#define OFFSET(x) offsetof(DeblockContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption deblock_options[] = {
{ "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, "filter" },
{ "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, "filter" },
{ "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, "filter" },
{ "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS },
{ "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS },
{ "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
{ "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
{ "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS },
{ NULL },
};
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFILTER_DEFINE_CLASS(deblock);
AVFilter ff_vf_deblock = {
.name = "deblock",
.description = NULL_IF_CONFIG_SMALL("Deblock video."),
.priv_size = sizeof(DeblockContext),
.priv_class = &deblock_class,
.query_formats = query_formats,
.inputs = inputs,
.outputs = outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};