| /* |
| * Copyright (c) 2010 Nolan Lum <nol888@gmail.com> |
| * Copyright (c) 2009 Loren Merritt <lorenm@u.washington.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/opt.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; 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; |
| } |
| emms_c(); |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| GradFunContext *s = ctx->priv; |
| |
| s->thresh = (1 << 15) / s->strength; |
| s->radius = av_clip((s->radius + 1) & ~1, 4, 32); |
| |
| s->blur_line = ff_gradfun_blur_line_c; |
| s->filter_line = ff_gradfun_filter_line_c; |
| |
| if (ARCH_X86) |
| ff_gradfun_init_x86(s); |
| |
| av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", s->strength, s->radius); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| GradFunContext *s = ctx->priv; |
| av_freep(&s->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_YUV444P, |
| AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P, |
| AV_PIX_FMT_YUV440P, |
| AV_PIX_FMT_GBRP, |
| AV_PIX_FMT_NONE |
| }; |
| AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| GradFunContext *s = 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; |
| |
| av_freep(&s->buf); |
| s->buf = av_calloc((FFALIGN(inlink->w, 16) * (s->radius + 1) / 2 + 32), sizeof(*s->buf)); |
| if (!s->buf) |
| return AVERROR(ENOMEM); |
| |
| s->chroma_w = AV_CEIL_RSHIFT(inlink->w, hsub); |
| s->chroma_h = AV_CEIL_RSHIFT(inlink->h, vsub); |
| s->chroma_r = av_clip(((((s->radius >> hsub) + (s->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32); |
| |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| GradFunContext *s = inlink->dst->priv; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| AVFrame *out; |
| int p, direct; |
| |
| if (av_frame_is_writable(in)) { |
| direct = 1; |
| out = in; |
| } else { |
| direct = 0; |
| 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 (p = 0; p < 4 && in->data[p] && in->linesize[p]; p++) { |
| int w = inlink->w; |
| int h = inlink->h; |
| int r = s->radius; |
| if (p) { |
| w = s->chroma_w; |
| h = s->chroma_h; |
| r = s->chroma_r; |
| } |
| |
| if (FFMIN(w, h) > 2 * r) |
| filter(s, 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) |
| av_frame_free(&in); |
| |
| return ff_filter_frame(outlink, out); |
| } |
| |
| #define OFFSET(x) offsetof(GradFunContext, x) |
| #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption gradfun_options[] = { |
| { "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 }, |
| { "radius", "The neighborhood to fit the gradient to.", OFFSET(radius), AV_OPT_TYPE_INT, { .i64 = 16 }, 4, 32, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(gradfun); |
| |
| static const AVFilterPad avfilter_vf_gradfun_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_gradfun_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_gradfun = { |
| .name = "gradfun", |
| .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."), |
| .priv_size = sizeof(GradFunContext), |
| .priv_class = &gradfun_class, |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .inputs = avfilter_vf_gradfun_inputs, |
| .outputs = avfilter_vf_gradfun_outputs, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| }; |