/* * Copyright (c) 2018 Paul B Mahol * * 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 */ /* * Based on paper: A Simple and Efficient Deblocking Algorithm for Low Bit-Rate Video Coding. */ #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" enum FilterType { WEAK, STRONG, NB_FILTER }; typedef struct DeblockContext { const AVClass *class; const AVPixFmtDescriptor *desc; int filter; int block; int planes; float alpha; float beta; float gamma; float delta; int ath; int bth; int gth; int dth; int max; int depth; int bpc; int nb_planes; int planewidth[4]; int planeheight[4]; void (*deblockh)(uint8_t *dst, ptrdiff_t dst_linesize, int block, int ath, int bth, int gth, int dth, int max); void (*deblockv)(uint8_t *dst, ptrdiff_t dst_linesize, int block, int ath, int bth, int gth, int dth, int max); } DeblockContext; static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pixel_fmts[] = { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12, AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16, AV_PIX_FMT_NONE }; AVFilterFormats *formats = ff_make_format_list(pixel_fmts); if (!formats) return AVERROR(ENOMEM); return ff_set_common_formats(ctx, formats); } #define WEAK_HFILTER(name, type, ldiv) \ static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \ int ath, int bth, int gth, int dth, int max) \ { \ type *dst; \ int x; \ \ dst = (type *)dstp; \ dst_linesize /= ldiv; \ \ for (x = 0; x < block; x++) { \ int delta = dst[x] - dst[x - dst_linesize]; \ int A, B, C, D, a, b, c, d; \ \ if (FFABS(delta) >= ath || \ FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \ FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth) \ continue; \ \ A = dst[x - 2 * dst_linesize]; \ B = dst[x - 1 * dst_linesize]; \ C = dst[x + 0 * dst_linesize]; \ D = dst[x + 1 * dst_linesize]; \ \ a = A + delta / 8; \ b = B + delta / 2; \ c = C - delta / 2; \ d = D - delta / 8; \ \ dst[x - 2 * dst_linesize] = av_clip(a, 0, max); \ dst[x - 1 * dst_linesize] = av_clip(b, 0, max); \ dst[x + 0 * dst_linesize] = av_clip(c, 0, max); \ dst[x + 1 * dst_linesize] = av_clip(d, 0, max); \ } \ } WEAK_HFILTER(8, uint8_t, 1) WEAK_HFILTER(16, uint16_t, 2) #define WEAK_VFILTER(name, type, ldiv) \ static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \ int ath, int bth, int gth, int dth, int max) \ { \ type *dst; \ int y; \ \ dst = (type *)dstp; \ dst_linesize /= ldiv; \ \ for (y = 0; y < block; y++) { \ int delta = dst[0] - dst[-1]; \ int A, B, C, D, a, b, c, d; \ \ if (FFABS(delta) >= ath || \ FFABS(dst[-1] - dst[-2]) >= bth || \ FFABS(dst[0] - dst[1]) >= gth) \ continue; \ \ A = dst[-2]; \ B = dst[-1]; \ C = dst[+0]; \ D = dst[+1]; \ \ a = A + delta / 8; \ b = B + delta / 2; \ c = C - delta / 2; \ d = D - delta / 8; \ \ dst[-2] = av_clip(a, 0, max); \ dst[-1] = av_clip(b, 0, max); \ dst[+0] = av_clip(c, 0, max); \ dst[+1] = av_clip(d, 0, max); \ \ dst += dst_linesize; \ } \ } WEAK_VFILTER(8, uint8_t, 1) WEAK_VFILTER(16, uint16_t, 2) #define STRONG_HFILTER(name, type, ldiv) \ static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\ int ath, int bth, int gth, int dth, int max) \ { \ type *dst; \ int x; \ \ dst = (type *)dstp; \ dst_linesize /= ldiv; \ \ for (x = 0; x < block; x++) { \ int A, B, C, D, E, F, a, b, c, d, e, f; \ int delta = dst[x] - dst[x - dst_linesize]; \ \ if (FFABS(delta) >= ath || \ FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \ FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \ FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth) \ continue; \ \ A = dst[x - 3 * dst_linesize]; \ B = dst[x - 2 * dst_linesize]; \ C = dst[x - 1 * dst_linesize]; \ D = dst[x + 0 * dst_linesize]; \ E = dst[x + 1 * dst_linesize]; \ F = dst[x + 2 * dst_linesize]; \ \ a = A + delta / 8; \ b = B + delta / 4; \ c = C + delta / 2; \ d = D - delta / 2; \ e = E - delta / 4; \ f = F - delta / 8; \ \ dst[x - 3 * dst_linesize] = av_clip(a, 0, max); \ dst[x - 2 * dst_linesize] = av_clip(b, 0, max); \ dst[x - 1 * dst_linesize] = av_clip(c, 0, max); \ dst[x + 0 * dst_linesize] = av_clip(d, 0, max); \ dst[x + 1 * dst_linesize] = av_clip(e, 0, max); \ dst[x + 2 * dst_linesize] = av_clip(f, 0, max); \ } \ } STRONG_HFILTER(8, uint8_t, 1) STRONG_HFILTER(16, uint16_t, 2) #define STRONG_VFILTER(name, type, ldiv) \ static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\ int ath, int bth, int gth, int dth, int max) \ { \ type *dst; \ int y; \ \ dst = (type *)dstp; \ dst_linesize /= ldiv; \ \ for (y = 0; y < block; y++) { \ int A, B, C, D, E, F, a, b, c, d, e, f; \ int delta = dst[0] - dst[-1]; \ \ if (FFABS(delta) >= ath || \ FFABS(dst[-1] - dst[-2]) >= bth || \ FFABS(dst[+1] - dst[+2]) >= gth || \ FFABS(dst[+0] - dst[+1]) >= dth) \ continue; \ \ A = dst[-3]; \ B = dst[-2]; \ C = dst[-1]; \ D = dst[+0]; \ E = dst[+1]; \ F = dst[+2]; \ \ a = A + delta / 8; \ b = B + delta / 4; \ c = C + delta / 2; \ d = D - delta / 2; \ e = E - delta / 4; \ f = F - delta / 8; \ \ dst[-3] = av_clip(a, 0, max); \ dst[-2] = av_clip(b, 0, max); \ dst[-1] = av_clip(c, 0, max); \ dst[+0] = av_clip(d, 0, max); \ dst[+1] = av_clip(e, 0, max); \ dst[+2] = av_clip(f, 0, max); \ \ dst += dst_linesize; \ } \ } STRONG_VFILTER(8, uint8_t, 1) STRONG_VFILTER(16, uint16_t, 2) static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; DeblockContext *s = ctx->priv; AVFilterLink *inlink = ctx->inputs[0]; s->desc = av_pix_fmt_desc_get(outlink->format); if (!s->desc) return AVERROR_BUG; s->nb_planes = av_pix_fmt_count_planes(outlink->format); s->depth = s->desc->comp[0].depth; s->bpc = (s->depth + 7) / 8; s->max = (1 << s->depth) - 1; s->ath = s->alpha * s->max; s->bth = s->beta * s->max; s->gth = s->gamma * s->max; s->dth = s->delta * s->max; if (s->depth <= 8 && s->filter == WEAK) { s->deblockh = deblockh8_weak; s->deblockv = deblockv8_weak; } else if (s->depth >= 8 && s->filter == WEAK) { s->deblockh = deblockh16_weak; s->deblockv = deblockv16_weak; } if (s->depth <= 8 && s->filter == STRONG) { s->deblockh = deblockh8_strong; s->deblockv = deblockv8_strong; } else if (s->depth >= 8 && s->filter == STRONG) { s->deblockh = deblockh16_strong; s->deblockv = deblockv16_strong; } s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w); s->planewidth[0] = s->planewidth[3] = inlink->w; s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h); s->planeheight[0] = s->planeheight[3] = inlink->h; return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; DeblockContext *s = ctx->priv; const int block = s->block; AVFrame *out; int plane, x, y; if (av_frame_is_writable(in)) { out = in; } else { 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 (plane = 0; plane < s->nb_planes; plane++) { const int width = s->planewidth[plane]; const int height = s->planeheight[plane]; const uint8_t *src = (const uint8_t *)in->data[plane]; uint8_t *dst = (uint8_t *)out->data[plane]; if (in != out) av_image_copy_plane(dst, out->linesize[plane], src, in->linesize[plane], width * s->bpc, height); if (!((1 << plane) & s->planes)) continue; for (x = block; x < width; x += block) s->deblockv(dst + x * s->bpc, out->linesize[plane], FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max); for (y = block; y < height; y += block) { dst += out->linesize[plane] * block; s->deblockh(dst, out->linesize[plane], FFMIN(block, width), s->ath, s->bth, s->gth, s->dth, s->max); for (x = block; x < width; x += block) { s->deblockh(dst + x * s->bpc, out->linesize[plane], FFMIN(block, width - x), s->ath, s->bth, s->gth, s->dth, s->max); s->deblockv(dst + x * s->bpc, out->linesize[plane], FFMIN(block, height - y), s->ath, s->bth, s->gth, s->dth, s->max); } } } if (in != out) av_frame_free(&in); return ff_filter_frame(outlink, out); } #define OFFSET(x) offsetof(DeblockContext, x) #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM static const AVOption deblock_options[] = { { "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, "filter" }, { "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, "filter" }, { "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, "filter" }, { "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS }, { "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS }, { "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS }, { "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS }, { "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS }, { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS }, { NULL }, }; static const AVFilterPad inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_output, }, { NULL } }; AVFILTER_DEFINE_CLASS(deblock); AVFilter ff_vf_deblock = { .name = "deblock", .description = NULL_IF_CONFIG_SMALL("Deblock video."), .priv_size = sizeof(DeblockContext), .priv_class = &deblock_class, .query_formats = query_formats, .inputs = inputs, .outputs = outputs, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };