/* * Copyright (c) 2012 Jeremy Tran * Copyright (c) 2004 Tobias Diedrich * Copyright (c) 2003 Donald A. Graft * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * * You should have received a copy of the GNU 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 * Kernel Deinterlacer * Ported from MPlayer libmpcodecs/vf_kerndeint.c. */ #include "libavutil/imgutils.h" #include "libavutil/intreadwrite.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" typedef struct { const AVClass *class; int frame; ///< frame count, starting from 0 int thresh, map, order, sharp, twoway; int vsub; uint8_t *tmp_data [4]; ///< temporary plane data buffer int tmp_linesize[4]; ///< temporary plane byte linesize int tmp_bwidth [4]; ///< temporary plane byte width } KerndeintContext; #define OFFSET(x) offsetof(KerndeintContext, x) #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static const AVOption kerndeint_options[] = { { "thresh", "set the threshold", OFFSET(thresh), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS }, { "map", "set the map", OFFSET(map), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, { "order", "set the order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, { "sharp", "enable sharpening", OFFSET(sharp), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, { "twoway", "enable twoway", OFFSET(twoway), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(kerndeint); static av_cold int init(AVFilterContext *ctx, const char *args) { KerndeintContext *kerndeint = ctx->priv; const char const * shorthand[] = { "thresh", "map", "order", "sharp", "twoway", NULL }; kerndeint->class = &kerndeint_class; av_opt_set_defaults(kerndeint); return av_opt_set_from_string(kerndeint, args, shorthand, "=", ":"); } static av_cold void uninit(AVFilterContext *ctx) { KerndeintContext *kerndeint = ctx->priv; av_free(kerndeint->tmp_data[0]); av_opt_free(kerndeint); } static int query_formats(AVFilterContext *ctx) { static const enum PixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUYV422, AV_PIX_FMT_ARGB, AV_PIX_FMT_0RGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_0BGR, AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB0, AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static int config_props(AVFilterLink *inlink) { KerndeintContext *kerndeint = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); int ret; kerndeint->vsub = desc->log2_chroma_h; ret = av_image_alloc(kerndeint->tmp_data, kerndeint->tmp_linesize, inlink->w, inlink->h, inlink->format, 16); if (ret < 0) return ret; memset(kerndeint->tmp_data[0], 0, ret); if ((ret = av_image_fill_linesizes(kerndeint->tmp_bwidth, inlink->format, inlink->w)) < 0) return ret; return 0; } static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic) { KerndeintContext *kerndeint = inlink->dst->priv; AVFilterLink *outlink = inlink->dst->outputs[0]; AVFilterBufferRef *outpic; const uint8_t *prvp; ///< Previous field's pixel line number n const uint8_t *prvpp; ///< Previous field's pixel line number (n - 1) const uint8_t *prvpn; ///< Previous field's pixel line number (n + 1) const uint8_t *prvppp; ///< Previous field's pixel line number (n - 2) const uint8_t *prvpnn; ///< Previous field's pixel line number (n + 2) const uint8_t *prvp4p; ///< Previous field's pixel line number (n - 4) const uint8_t *prvp4n; ///< Previous field's pixel line number (n + 4) const uint8_t *srcp; ///< Current field's pixel line number n const uint8_t *srcpp; ///< Current field's pixel line number (n - 1) const uint8_t *srcpn; ///< Current field's pixel line number (n + 1) const uint8_t *srcppp; ///< Current field's pixel line number (n - 2) const uint8_t *srcpnn; ///< Current field's pixel line number (n + 2) const uint8_t *srcp3p; ///< Current field's pixel line number (n - 3) const uint8_t *srcp3n; ///< Current field's pixel line number (n + 3) const uint8_t *srcp4p; ///< Current field's pixel line number (n - 4) const uint8_t *srcp4n; ///< Current field's pixel line number (n + 4) uint8_t *dstp, *dstp_saved; const uint8_t *srcp_saved; int src_linesize, psrc_linesize, dst_linesize, bwidth; int x, y, plane, val, hi, lo, g, h, n = kerndeint->frame++; double valf; const int thresh = kerndeint->thresh; const int order = kerndeint->order; const int map = kerndeint->map; const int sharp = kerndeint->sharp; const int twoway = kerndeint->twoway; const int is_packed_rgb = av_pix_fmt_desc_get(inlink->format)->flags & PIX_FMT_RGB; outpic = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, outlink->w, outlink->h); if (!outpic) { avfilter_unref_bufferp(&inpic); return AVERROR(ENOMEM); } avfilter_copy_buffer_ref_props(outpic, inpic); outpic->video->interlaced = 0; for (plane = 0; inpic->data[plane] && plane < 4; plane++) { h = plane == 0 ? inlink->h : inlink->h >> kerndeint->vsub; bwidth = kerndeint->tmp_bwidth[plane]; srcp = srcp_saved = inpic->data[plane]; src_linesize = inpic->linesize[plane]; psrc_linesize = kerndeint->tmp_linesize[plane]; dstp = dstp_saved = outpic->data[plane]; dst_linesize = outpic->linesize[plane]; srcp = srcp_saved + (1 - order) * src_linesize; dstp = dstp_saved + (1 - order) * dst_linesize; for (y = 0; y < h; y += 2) { memcpy(dstp, srcp, bwidth); srcp += 2 * src_linesize; dstp += 2 * dst_linesize; } // Copy through the lines that will be missed below. memcpy(dstp_saved + order * dst_linesize, srcp_saved + (1 - order) * src_linesize, bwidth); memcpy(dstp_saved + (2 + order ) * dst_linesize, srcp_saved + (3 - order) * src_linesize, bwidth); memcpy(dstp_saved + (h - 2 + order) * dst_linesize, srcp_saved + (h - 1 - order) * src_linesize, bwidth); memcpy(dstp_saved + (h - 4 + order) * dst_linesize, srcp_saved + (h - 3 - order) * src_linesize, bwidth); /* For the other field choose adaptively between using the previous field or the interpolant from the current field. */ prvp = kerndeint->tmp_data[plane] + 5 * psrc_linesize - (1 - order) * psrc_linesize; prvpp = prvp - psrc_linesize; prvppp = prvp - 2 * psrc_linesize; prvp4p = prvp - 4 * psrc_linesize; prvpn = prvp + psrc_linesize; prvpnn = prvp + 2 * psrc_linesize; prvp4n = prvp + 4 * psrc_linesize; srcp = srcp_saved + 5 * src_linesize - (1 - order) * src_linesize; srcpp = srcp - src_linesize; srcppp = srcp - 2 * src_linesize; srcp3p = srcp - 3 * src_linesize; srcp4p = srcp - 4 * src_linesize; srcpn = srcp + src_linesize; srcpnn = srcp + 2 * src_linesize; srcp3n = srcp + 3 * src_linesize; srcp4n = srcp + 4 * src_linesize; dstp = dstp_saved + 5 * dst_linesize - (1 - order) * dst_linesize; for (y = 5 - (1 - order); y <= h - 5 - (1 - order); y += 2) { for (x = 0; x < bwidth; x++) { if (thresh == 0 || n == 0 || (abs((int)prvp[x] - (int)srcp[x]) > thresh) || (abs((int)prvpp[x] - (int)srcpp[x]) > thresh) || (abs((int)prvpn[x] - (int)srcpn[x]) > thresh)) { if (map) { g = x & ~3; if (is_packed_rgb) { AV_WB32(dstp + g, 0xffffffff); x = g + 3; } else if (inlink->format == AV_PIX_FMT_YUYV422) { // y <- 235, u <- 128, y <- 235, v <- 128 AV_WB32(dstp + g, 0xeb80eb80); x = g + 3; } else { dstp[x] = plane == 0 ? 235 : 128; } } else { if (is_packed_rgb) { hi = 255; lo = 0; } else if (inlink->format == AV_PIX_FMT_YUYV422) { hi = x & 1 ? 240 : 235; lo = 16; } else { hi = plane == 0 ? 235 : 240; lo = 16; } if (sharp) { if (twoway) { valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x]) + 0.170 * ((int)srcp[x] + (int)prvp[x]) - 0.116 * ((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x]) - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x]) + 0.031 * ((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]); } else { valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x]) + 0.170 * ((int)prvp[x]) - 0.116 * ((int)prvppp[x] + (int)prvpnn[x]) - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x]) + 0.031 * ((int)prvp4p[x] + (int)prvp4p[x]); } dstp[x] = av_clip(valf, lo, hi); } else { if (twoway) { val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)srcp[x] + (int)prvp[x]) - (int)(srcppp[x]) - (int)(srcpnn[x]) - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4; } else { val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)prvp[x]) - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4; } dstp[x] = av_clip(val, lo, hi); } } } else { dstp[x] = srcp[x]; } } prvp += 2 * psrc_linesize; prvpp += 2 * psrc_linesize; prvppp += 2 * psrc_linesize; prvpn += 2 * psrc_linesize; prvpnn += 2 * psrc_linesize; prvp4p += 2 * psrc_linesize; prvp4n += 2 * psrc_linesize; srcp += 2 * src_linesize; srcpp += 2 * src_linesize; srcppp += 2 * src_linesize; srcp3p += 2 * src_linesize; srcp4p += 2 * src_linesize; srcpn += 2 * src_linesize; srcpnn += 2 * src_linesize; srcp3n += 2 * src_linesize; srcp4n += 2 * src_linesize; dstp += 2 * dst_linesize; } srcp = inpic->data[plane]; dstp = kerndeint->tmp_data[plane]; av_image_copy_plane(dstp, psrc_linesize, srcp, src_linesize, bwidth, h); } avfilter_unref_buffer(inpic); return ff_filter_frame(outlink, outpic); } static const AVFilterPad kerndeint_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_props, .min_perms = AV_PERM_READ, }, { NULL } }; static const AVFilterPad kerndeint_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter avfilter_vf_kerndeint = { .name = "kerndeint", .description = NULL_IF_CONFIG_SMALL("Apply kernel deinterlacing to the input."), .priv_size = sizeof(KerndeintContext), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = kerndeint_inputs, .outputs = kerndeint_outputs, .priv_class = &kerndeint_class, };