271 lines
8.6 KiB
C
271 lines
8.6 KiB
C
/*
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* Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
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* Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* gradfun debanding filter, ported from MPlayer
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* libmpcodecs/vf_gradfun.c
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*
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* Apply a boxblur debanding algorithm (based on the gradfun2db
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* Avisynth filter by prunedtree).
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* Foreach pixel, if it's within threshold of the blurred value, make it closer.
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* So now we have a smoothed and higher bitdepth version of all the shallow
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* gradients, while leaving detailed areas untouched.
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* Dither it back to 8bit.
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/common.h"
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#include "libavutil/cpu.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "gradfun.h"
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#include "internal.h"
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#include "video.h"
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DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = {
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{0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
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{0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E},
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{0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E},
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{0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E},
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{0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A},
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{0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A},
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{0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A},
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{0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A},
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};
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void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
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{
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int x;
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for (x = 0; x < width; dc += x & 1, x++) {
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int pix = src[x] << 7;
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int delta = dc[0] - pix;
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int m = abs(delta) * thresh >> 16;
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m = FFMAX(0, 127 - m);
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m = m * m * delta >> 14;
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pix += m + dithers[x & 7];
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dst[x] = av_clip_uint8(pix >> 7);
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}
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}
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void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
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{
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int x, v, old;
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for (x = 0; x < width; x++) {
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v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize];
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old = buf[x];
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buf[x] = v;
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dc[x] = v - old;
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}
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}
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static void filter(GradFunContext *ctx, uint8_t *dst, uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
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{
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int bstride = FFALIGN(width, 16) / 2;
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int y;
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uint32_t dc_factor = (1 << 21) / (r * r);
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uint16_t *dc = ctx->buf + 16;
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uint16_t *buf = ctx->buf + bstride + 32;
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int thresh = ctx->thresh;
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memset(dc, 0, (bstride + 16) * sizeof(*buf));
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for (y = 0; y < r; y++)
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ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2);
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for (;;) {
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if (y < height - r) {
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int mod = ((y + r) / 2) % r;
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uint16_t *buf0 = buf + mod * bstride;
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uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride;
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int x, v;
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ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2);
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for (x = v = 0; x < r; x++)
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v += dc[x];
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for (; x < width / 2; x++) {
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v += dc[x] - dc[x-r];
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dc[x-r] = v * dc_factor >> 16;
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}
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for (; x < (width + r + 1) / 2; x++)
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dc[x-r] = v * dc_factor >> 16;
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for (x = -r / 2; x < 0; x++)
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dc[x] = dc[0];
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}
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if (y == r) {
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for (y = 0; y < r; y++)
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ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
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}
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ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
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if (++y >= height) break;
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ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
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if (++y >= height) break;
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}
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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GradFunContext *s = ctx->priv;
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s->thresh = (1 << 15) / s->strength;
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s->radius &= ~1;
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s->blur_line = ff_gradfun_blur_line_c;
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s->filter_line = ff_gradfun_filter_line_c;
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if (ARCH_X86)
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ff_gradfun_init_x86(s);
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av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", s->strength, s->radius);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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GradFunContext *s = ctx->priv;
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av_freep(&s->buf);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
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AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_NONE
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};
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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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}
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static int config_input(AVFilterLink *inlink)
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{
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GradFunContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int hsub = desc->log2_chroma_w;
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int vsub = desc->log2_chroma_h;
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av_freep(&s->buf);
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s->buf = av_mallocz((FFALIGN(inlink->w, 16) * (s->radius + 1) / 2 + 32) * sizeof(uint16_t));
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if (!s->buf)
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return AVERROR(ENOMEM);
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s->chroma_w = -((-inlink->w) >> hsub);
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s->chroma_h = -((-inlink->h) >> vsub);
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s->chroma_r = av_clip(((((s->radius >> hsub) + (s->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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GradFunContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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int p, direct;
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if (av_frame_is_writable(in)) {
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direct = 1;
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out = in;
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} else {
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direct = 0;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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out->width = outlink->w;
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out->height = outlink->h;
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}
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for (p = 0; p < 4 && in->data[p]; p++) {
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int w = inlink->w;
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int h = inlink->h;
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int r = s->radius;
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if (p) {
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w = s->chroma_w;
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h = s->chroma_h;
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r = s->chroma_r;
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}
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if (FFMIN(w, h) > 2 * r)
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filter(s, out->data[p], in->data[p], w, h, out->linesize[p], in->linesize[p], r);
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else if (out->data[p] != in->data[p])
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av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p], w, h);
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}
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if (!direct)
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(GradFunContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "strength", "The maximum amount by which the filter will change any one pixel.", OFFSET(strength), AV_OPT_TYPE_FLOAT, { .dbl = 1.2 }, 0.51, 64, FLAGS },
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{ "radius", "The neighborhood to fit the gradient to.", OFFSET(radius), AV_OPT_TYPE_INT, { .i64 = 16 }, 4, 32, FLAGS },
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{ NULL },
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};
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static const AVClass gradfun_class = {
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.class_name = "gradfun",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_gradfun_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_gradfun_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_gradfun = {
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.name = "gradfun",
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.description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."),
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.priv_size = sizeof(GradFunContext),
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.priv_class = &gradfun_class,
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = avfilter_vf_gradfun_inputs,
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.outputs = avfilter_vf_gradfun_outputs,
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};
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