yading@10: /* yading@10: * Copyright (c) 2010 Nolan Lum yading@10: * Copyright (c) 2009 Loren Merritt yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * gradfun debanding filter, ported from MPlayer yading@10: * libmpcodecs/vf_gradfun.c yading@10: * yading@10: * Apply a boxblur debanding algorithm (based on the gradfun2db yading@10: * Avisynth filter by prunedtree). yading@10: * Foreach pixel, if it's within threshold of the blurred value, make it closer. yading@10: * So now we have a smoothed and higher bitdepth version of all the shallow yading@10: * gradients, while leaving detailed areas untouched. yading@10: * Dither it back to 8bit. yading@10: */ yading@10: yading@10: #include "libavutil/imgutils.h" yading@10: #include "libavutil/common.h" yading@10: #include "libavutil/cpu.h" yading@10: #include "libavutil/opt.h" yading@10: #include "libavutil/pixdesc.h" yading@10: #include "libavutil/opt.h" yading@10: #include "avfilter.h" yading@10: #include "formats.h" yading@10: #include "gradfun.h" yading@10: #include "internal.h" yading@10: #include "video.h" yading@10: yading@10: DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = { yading@10: {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E}, yading@10: {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E}, yading@10: {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E}, yading@10: {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E}, yading@10: {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A}, yading@10: {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A}, yading@10: {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A}, yading@10: {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A}, yading@10: }; yading@10: yading@10: 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) yading@10: { yading@10: int x; yading@10: for (x = 0; x < width; dc += x & 1, x++) { yading@10: int pix = src[x] << 7; yading@10: int delta = dc[0] - pix; yading@10: int m = abs(delta) * thresh >> 16; yading@10: m = FFMAX(0, 127 - m); yading@10: m = m * m * delta >> 14; yading@10: pix += m + dithers[x & 7]; yading@10: dst[x] = av_clip_uint8(pix >> 7); yading@10: } yading@10: } yading@10: yading@10: 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) yading@10: { yading@10: int x, v, old; yading@10: for (x = 0; x < width; x++) { yading@10: v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize]; yading@10: old = buf[x]; yading@10: buf[x] = v; yading@10: dc[x] = v - old; yading@10: } yading@10: } yading@10: yading@10: static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r) yading@10: { yading@10: int bstride = FFALIGN(width, 16) / 2; yading@10: int y; yading@10: uint32_t dc_factor = (1 << 21) / (r * r); yading@10: uint16_t *dc = ctx->buf + 16; yading@10: uint16_t *buf = ctx->buf + bstride + 32; yading@10: int thresh = ctx->thresh; yading@10: yading@10: memset(dc, 0, (bstride + 16) * sizeof(*buf)); yading@10: for (y = 0; y < r; y++) yading@10: ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2); yading@10: for (;;) { yading@10: if (y < height - r) { yading@10: int mod = ((y + r) / 2) % r; yading@10: uint16_t *buf0 = buf + mod * bstride; yading@10: uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride; yading@10: int x, v; yading@10: ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2); yading@10: for (x = v = 0; x < r; x++) yading@10: v += dc[x]; yading@10: for (; x < width / 2; x++) { yading@10: v += dc[x] - dc[x-r]; yading@10: dc[x-r] = v * dc_factor >> 16; yading@10: } yading@10: for (; x < (width + r + 1) / 2; x++) yading@10: dc[x-r] = v * dc_factor >> 16; yading@10: for (x = -r / 2; x < 0; x++) yading@10: dc[x] = dc[0]; yading@10: } yading@10: if (y == r) { yading@10: for (y = 0; y < r; y++) yading@10: ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); yading@10: } yading@10: ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); yading@10: if (++y >= height) break; yading@10: ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); yading@10: if (++y >= height) break; yading@10: } yading@10: } yading@10: yading@10: static av_cold int init(AVFilterContext *ctx) yading@10: { yading@10: GradFunContext *gf = ctx->priv; yading@10: yading@10: gf->thresh = (1 << 15) / gf->strength; yading@10: gf->radius = av_clip((gf->radius + 1) & ~1, 4, 32); yading@10: yading@10: gf->blur_line = ff_gradfun_blur_line_c; yading@10: gf->filter_line = ff_gradfun_filter_line_c; yading@10: yading@10: if (ARCH_X86) yading@10: ff_gradfun_init_x86(gf); yading@10: yading@10: av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", gf->strength, gf->radius); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold void uninit(AVFilterContext *ctx) yading@10: { yading@10: GradFunContext *gf = ctx->priv; yading@10: av_freep(&gf->buf); yading@10: } yading@10: yading@10: static int query_formats(AVFilterContext *ctx) yading@10: { yading@10: static const enum AVPixelFormat pix_fmts[] = { yading@10: AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, yading@10: AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12, yading@10: AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, yading@10: AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P, yading@10: AV_PIX_FMT_YUV440P, yading@10: AV_PIX_FMT_NONE yading@10: }; yading@10: yading@10: ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int config_input(AVFilterLink *inlink) yading@10: { yading@10: GradFunContext *gf = inlink->dst->priv; yading@10: const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); yading@10: int hsub = desc->log2_chroma_w; yading@10: int vsub = desc->log2_chroma_h; yading@10: yading@10: gf->buf = av_mallocz((FFALIGN(inlink->w, 16) * (gf->radius + 1) / 2 + 32) * sizeof(uint16_t)); yading@10: if (!gf->buf) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: gf->chroma_w = -((-inlink->w) >> hsub); yading@10: gf->chroma_h = -((-inlink->h) >> vsub); yading@10: gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *in) yading@10: { yading@10: GradFunContext *gf = inlink->dst->priv; yading@10: AVFilterLink *outlink = inlink->dst->outputs[0]; yading@10: AVFrame *out; yading@10: int p, direct; yading@10: yading@10: if (av_frame_is_writable(in)) { yading@10: direct = 1; yading@10: out = in; yading@10: } else { yading@10: direct = 0; yading@10: out = ff_get_video_buffer(outlink, outlink->w, outlink->h); yading@10: if (!out) { yading@10: av_frame_free(&in); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: av_frame_copy_props(out, in); yading@10: } yading@10: yading@10: for (p = 0; p < 4 && in->data[p]; p++) { yading@10: int w = inlink->w; yading@10: int h = inlink->h; yading@10: int r = gf->radius; yading@10: if (p) { yading@10: w = gf->chroma_w; yading@10: h = gf->chroma_h; yading@10: r = gf->chroma_r; yading@10: } yading@10: yading@10: if (FFMIN(w, h) > 2 * r) yading@10: filter(gf, out->data[p], in->data[p], w, h, out->linesize[p], in->linesize[p], r); yading@10: else if (out->data[p] != in->data[p]) yading@10: av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p], w, h); yading@10: } yading@10: yading@10: if (!direct) yading@10: av_frame_free(&in); yading@10: yading@10: return ff_filter_frame(outlink, out); yading@10: } yading@10: yading@10: #define OFFSET(x) offsetof(GradFunContext, x) yading@10: #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM yading@10: yading@10: static const AVOption gradfun_options[] = { yading@10: { "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 }, yading@10: { "radius", "The neighborhood to fit the gradient to.", OFFSET(radius), AV_OPT_TYPE_INT, { .i64 = 16 }, 4, 32, FLAGS }, yading@10: { NULL }, yading@10: }; yading@10: yading@10: AVFILTER_DEFINE_CLASS(gradfun); yading@10: yading@10: static const AVFilterPad avfilter_vf_gradfun_inputs[] = { yading@10: { yading@10: .name = "default", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .config_props = config_input, yading@10: .filter_frame = filter_frame, yading@10: }, yading@10: { NULL } yading@10: }; yading@10: yading@10: static const AVFilterPad avfilter_vf_gradfun_outputs[] = { yading@10: { yading@10: .name = "default", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: }, yading@10: { NULL } yading@10: }; yading@10: yading@10: AVFilter avfilter_vf_gradfun = { yading@10: .name = "gradfun", yading@10: .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."), yading@10: .priv_size = sizeof(GradFunContext), yading@10: .priv_class = &gradfun_class, yading@10: .init = init, yading@10: .uninit = uninit, yading@10: .query_formats = query_formats, yading@10: .inputs = avfilter_vf_gradfun_inputs, yading@10: .outputs = avfilter_vf_gradfun_outputs, yading@10: };