| /* |
| * 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 "avfilter.h" |
| #include "formats.h" |
| #include "gradfun.h" |
| #include "internal.h" |
| #include "video.h" |
| |
| 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; x++, dc += x & 1) { |
| 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) |
| { |
| GradFunContext *gf = ctx->priv; |
| float thresh = 1.2; |
| int radius = 16; |
| |
| if (args) |
| sscanf(args, "%f:%d", &thresh, &radius); |
| |
| thresh = av_clipf(thresh, 0.51, 255); |
| gf->thresh = (1 << 15) / thresh; |
| gf->radius = av_clip((radius + 1) & ~1, 4, 32); |
| |
| gf->blur_line = ff_gradfun_blur_line_c; |
| gf->filter_line = ff_gradfun_filter_line_c; |
| |
| if (HAVE_MMX) |
| ff_gradfun_init_x86(gf); |
| |
| av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", thresh, 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 PixelFormat pix_fmts[] = { |
| PIX_FMT_YUV410P, PIX_FMT_YUV420P, |
| PIX_FMT_GRAY8, PIX_FMT_NV12, |
| PIX_FMT_NV21, PIX_FMT_YUV444P, |
| PIX_FMT_YUV422P, PIX_FMT_YUV411P, |
| 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; |
| int hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; |
| int vsub = av_pix_fmt_descriptors[inlink->format].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 null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) |
| { |
| return 0; |
| } |
| |
| static int end_frame(AVFilterLink *inlink) |
| { |
| GradFunContext *gf = inlink->dst->priv; |
| AVFilterBufferRef *inpic = inlink->cur_buf; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| AVFilterBufferRef *outpic = outlink->out_buf; |
| int p, ret; |
| |
| for (p = 0; p < 4 && inpic->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, outpic->data[p], inpic->data[p], w, h, outpic->linesize[p], inpic->linesize[p], r); |
| else if (outpic->data[p] != inpic->data[p]) |
| av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h); |
| } |
| |
| if ((ret = ff_draw_slice(outlink, 0, inlink->h, 1)) < 0 || |
| (ret = ff_end_frame(outlink)) < 0) |
| return ret; |
| return 0; |
| } |
| |
| 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 = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .start_frame = ff_inplace_start_frame, |
| .draw_slice = null_draw_slice, |
| .end_frame = end_frame, |
| .min_perms = AV_PERM_READ, }, |
| { .name = NULL}}, |
| .outputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |