mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
270 lines
8.8 KiB
C
270 lines
8.8 KiB
C
/*
|
|
* Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
|
|
* Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
|
|
*
|
|
* 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
|
|
* gradfun debanding filter, ported from MPlayer
|
|
* libmpcodecs/vf_gradfun.c
|
|
*
|
|
* Apply a boxblur debanding algorithm (based on the gradfun2db
|
|
* Avisynth filter by prunedtree).
|
|
* Foreach pixel, if it's within threshold of the blurred value, make it closer.
|
|
* So now we have a smoothed and higher bitdepth version of all the shallow
|
|
* gradients, while leaving detailed areas untouched.
|
|
* Dither it back to 8bit.
|
|
*/
|
|
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/cpu.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "libavutil/opt.h"
|
|
#include "avfilter.h"
|
|
#include "formats.h"
|
|
#include "gradfun.h"
|
|
#include "internal.h"
|
|
#include "video.h"
|
|
|
|
#define OFFSET(x) offsetof(GradFunContext, x)
|
|
#define F AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption gradfun_options[] = {
|
|
{ "strength", "set the maximum amount by which the filter will change any one pixel", OFFSET(strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.2}, 0.51, 64, F },
|
|
{ "radius", "set the neighborhood to fit the gradient to", OFFSET(radius), AV_OPT_TYPE_INT, {.i64 = 16}, 4, 32, F },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(gradfun);
|
|
|
|
DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = {
|
|
{0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
|
|
{0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E},
|
|
{0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E},
|
|
{0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E},
|
|
{0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A},
|
|
{0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A},
|
|
{0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A},
|
|
{0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A},
|
|
};
|
|
|
|
void ff_gradfun_filter_line_c(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
|
|
{
|
|
int x;
|
|
for (x = 0; x < width; dc += x & 1, x++) {
|
|
int pix = src[x] << 7;
|
|
int delta = dc[0] - pix;
|
|
int m = abs(delta) * thresh >> 16;
|
|
m = FFMAX(0, 127 - m);
|
|
m = m * m * delta >> 14;
|
|
pix += m + dithers[x & 7];
|
|
dst[x] = av_clip_uint8(pix >> 7);
|
|
}
|
|
}
|
|
|
|
void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
|
|
{
|
|
int x, v, old;
|
|
for (x = 0; x < width; x++) {
|
|
v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize];
|
|
old = buf[x];
|
|
buf[x] = v;
|
|
dc[x] = v - old;
|
|
}
|
|
}
|
|
|
|
static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
|
|
{
|
|
int bstride = FFALIGN(width, 16) / 2;
|
|
int y;
|
|
uint32_t dc_factor = (1 << 21) / (r * r);
|
|
uint16_t *dc = ctx->buf + 16;
|
|
uint16_t *buf = ctx->buf + bstride + 32;
|
|
int thresh = ctx->thresh;
|
|
|
|
memset(dc, 0, (bstride + 16) * sizeof(*buf));
|
|
for (y = 0; y < r; y++)
|
|
ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2);
|
|
for (;;) {
|
|
if (y < height - r) {
|
|
int mod = ((y + r) / 2) % r;
|
|
uint16_t *buf0 = buf + mod * bstride;
|
|
uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride;
|
|
int x, v;
|
|
ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2);
|
|
for (x = v = 0; x < r; x++)
|
|
v += dc[x];
|
|
for (; x < width / 2; x++) {
|
|
v += dc[x] - dc[x-r];
|
|
dc[x-r] = v * dc_factor >> 16;
|
|
}
|
|
for (; x < (width + r + 1) / 2; x++)
|
|
dc[x-r] = v * dc_factor >> 16;
|
|
for (x = -r / 2; x < 0; x++)
|
|
dc[x] = dc[0];
|
|
}
|
|
if (y == r) {
|
|
for (y = 0; y < r; y++)
|
|
ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
|
|
}
|
|
ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
|
|
if (++y >= height) break;
|
|
ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
|
|
if (++y >= height) break;
|
|
}
|
|
}
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args)
|
|
{
|
|
int ret;
|
|
GradFunContext *gf = ctx->priv;
|
|
static const char *shorthand[] = { "strength", "radius", NULL };
|
|
|
|
gf->class = &gradfun_class;
|
|
av_opt_set_defaults(gf);
|
|
|
|
if ((ret = av_opt_set_from_string(gf, args, shorthand, "=", ":")) < 0)
|
|
return ret;
|
|
|
|
gf->thresh = (1 << 15) / gf->strength;
|
|
gf->radius = av_clip((gf->radius + 1) & ~1, 4, 32);
|
|
|
|
gf->blur_line = ff_gradfun_blur_line_c;
|
|
gf->filter_line = ff_gradfun_filter_line_c;
|
|
|
|
if (ARCH_X86)
|
|
ff_gradfun_init_x86(gf);
|
|
|
|
av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", gf->strength, gf->radius);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
GradFunContext *gf = ctx->priv;
|
|
av_freep(&gf->buf);
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
static const enum AVPixelFormat pix_fmts[] = {
|
|
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
|
|
AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P,
|
|
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
|
|
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
GradFunContext *gf = inlink->dst->priv;
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
|
|
int hsub = desc->log2_chroma_w;
|
|
int vsub = desc->log2_chroma_h;
|
|
|
|
gf->buf = av_mallocz((FFALIGN(inlink->w, 16) * (gf->radius + 1) / 2 + 32) * sizeof(uint16_t));
|
|
if (!gf->buf)
|
|
return AVERROR(ENOMEM);
|
|
|
|
gf->chroma_w = -((-inlink->w) >> hsub);
|
|
gf->chroma_h = -((-inlink->h) >> vsub);
|
|
gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
|
|
{
|
|
GradFunContext *gf = inlink->dst->priv;
|
|
AVFilterLink *outlink = inlink->dst->outputs[0];
|
|
AVFilterBufferRef *out;
|
|
int p, direct = 0;
|
|
|
|
if (in->perms & AV_PERM_WRITE) {
|
|
direct = 1;
|
|
out = in;
|
|
} else {
|
|
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);
|
|
}
|
|
|
|
for (p = 0; p < 4 && in->data[p]; p++) {
|
|
int w = inlink->w;
|
|
int h = inlink->h;
|
|
int r = gf->radius;
|
|
if (p) {
|
|
w = gf->chroma_w;
|
|
h = gf->chroma_h;
|
|
r = gf->chroma_r;
|
|
}
|
|
|
|
if (FFMIN(w, h) > 2 * r)
|
|
filter(gf, out->data[p], in->data[p], w, h, out->linesize[p], in->linesize[p], r);
|
|
else if (out->data[p] != in->data[p])
|
|
av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p], w, h);
|
|
}
|
|
|
|
if (!direct)
|
|
avfilter_unref_bufferp(&in);
|
|
|
|
return ff_filter_frame(outlink, out);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_gradfun_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
.min_perms = AV_PERM_READ,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_gradfun_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_gradfun = {
|
|
.name = "gradfun",
|
|
.description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."),
|
|
.priv_size = sizeof(GradFunContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.inputs = avfilter_vf_gradfun_inputs,
|
|
.outputs = avfilter_vf_gradfun_outputs,
|
|
.priv_class = &gradfun_class,
|
|
};
|