329 lines
13 KiB
C
329 lines
13 KiB
C
/*
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* Copyright (c) 2012 Jeremy Tran
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* Copyright (c) 2004 Tobias Diedrich
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* Copyright (c) 2003 Donald A. Graft
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Kernel Deinterlacer
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* Ported from MPlayer libmpcodecs/vf_kerndeint.c.
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class;
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int frame; ///< frame count, starting from 0
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int thresh, map, order, sharp, twoway;
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int vsub;
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uint8_t *tmp_data [4]; ///< temporary plane data buffer
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int tmp_bwidth[4]; ///< temporary plane byte width
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int pixel_step;
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} KerndeintContext;
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#define OFFSET(x) offsetof(KerndeintContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption kerndeint_options[] = {
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{ "thresh", "set the threshold", OFFSET(thresh), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
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{ "map", "set the map", OFFSET(map), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{ "order", "set the order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{ "sharp", "enable sharpening", OFFSET(sharp), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{ "twoway", "enable twoway", OFFSET(twoway), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(kerndeint);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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KerndeintContext *kerndeint = ctx->priv;
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const char const * shorthand[] = { "thresh", "map", "order", "sharp", "twoway", NULL };
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kerndeint->class = &kerndeint_class;
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av_opt_set_defaults(kerndeint);
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return av_opt_set_from_string(kerndeint, args, shorthand, "=", ":");
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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KerndeintContext *kerndeint = ctx->priv;
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av_free(kerndeint->tmp_data[0]);
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av_opt_free(kerndeint);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUYV422,
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AV_PIX_FMT_ARGB, AV_PIX_FMT_0RGB,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_0BGR,
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AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB0,
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AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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KerndeintContext *kerndeint = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
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int ret;
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kerndeint->vsub = desc->log2_chroma_h;
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kerndeint->pixel_step = av_get_bits_per_pixel(desc) >> 3;
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ret = av_image_alloc(kerndeint->tmp_data, kerndeint->tmp_bwidth,
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inlink->w, inlink->h, inlink->format, 1);
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if (ret < 0)
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return ret;
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memset(kerndeint->tmp_data[0], 0, ret);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic)
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{
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KerndeintContext *kerndeint = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *outpic;
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const uint8_t *prvp; ///< Previous field's pixel line number n
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const uint8_t *prvpp; ///< Previous field's pixel line number (n - 1)
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const uint8_t *prvpn; ///< Previous field's pixel line number (n + 1)
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const uint8_t *prvppp; ///< Previous field's pixel line number (n - 2)
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const uint8_t *prvpnn; ///< Previous field's pixel line number (n + 2)
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const uint8_t *prvp4p; ///< Previous field's pixel line number (n - 4)
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const uint8_t *prvp4n; ///< Previous field's pixel line number (n + 4)
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const uint8_t *srcp; ///< Current field's pixel line number n
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const uint8_t *srcpp; ///< Current field's pixel line number (n - 1)
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const uint8_t *srcpn; ///< Current field's pixel line number (n + 1)
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const uint8_t *srcppp; ///< Current field's pixel line number (n - 2)
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const uint8_t *srcpnn; ///< Current field's pixel line number (n + 2)
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const uint8_t *srcp3p; ///< Current field's pixel line number (n - 3)
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const uint8_t *srcp3n; ///< Current field's pixel line number (n + 3)
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const uint8_t *srcp4p; ///< Current field's pixel line number (n - 4)
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const uint8_t *srcp4n; ///< Current field's pixel line number (n + 4)
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uint8_t *dstp, *dstp_saved;
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const uint8_t *srcp_saved;
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int src_linesize, psrc_linesize, dst_linesize, bwidth;
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int x, y, plane, val, hi, lo, g, h, n = kerndeint->frame++;
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double valf;
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const int thresh = kerndeint->thresh;
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const int order = kerndeint->order;
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const int map = kerndeint->map;
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const int sharp = kerndeint->sharp;
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const int twoway = kerndeint->twoway;
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const int is_packed_rgb = av_pix_fmt_desc_get(inlink->format)->flags & PIX_FMT_RGB;
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outpic = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, outlink->w, outlink->h);
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if (!outpic) {
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avfilter_unref_bufferp(&inpic);
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return AVERROR(ENOMEM);
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}
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avfilter_copy_buffer_ref_props(outpic, inpic);
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outpic->video->interlaced = 0;
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for (plane = 0; inpic->data[plane] && plane < 4; plane++) {
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h = plane == 0 ? inlink->h : inlink->h >> kerndeint->vsub;
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bwidth = kerndeint->tmp_bwidth[plane];
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srcp = srcp_saved = inpic->data[plane];
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src_linesize = inpic->linesize[plane];
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psrc_linesize = outpic->linesize[plane];
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dstp = dstp_saved = outpic->data[plane];
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dst_linesize = outpic->linesize[plane];
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srcp = srcp_saved + (1 - order) * src_linesize;
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dstp = dstp_saved + (1 - order) * dst_linesize;
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for (y = 0; y < h; y += 2) {
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memcpy(dstp, srcp, bwidth);
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srcp += 2 * src_linesize;
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dstp += 2 * dst_linesize;
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}
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// Copy through the lines that will be missed below.
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memcpy(dstp_saved + order * dst_linesize, srcp_saved + (1 - order) * src_linesize, bwidth);
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memcpy(dstp_saved + (2 + order ) * dst_linesize, srcp_saved + (3 - order) * src_linesize, bwidth);
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memcpy(dstp_saved + (h - 2 + order) * dst_linesize, srcp_saved + (h - 1 - order) * src_linesize, bwidth);
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memcpy(dstp_saved + (h - 4 + order) * dst_linesize, srcp_saved + (h - 3 - order) * src_linesize, bwidth);
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/* For the other field choose adaptively between using the previous field
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or the interpolant from the current field. */
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prvp = kerndeint->tmp_data[plane] + 5 * psrc_linesize - (1 - order) * psrc_linesize;
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prvpp = prvp - psrc_linesize;
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prvppp = prvp - 2 * psrc_linesize;
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prvp4p = prvp - 4 * psrc_linesize;
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prvpn = prvp + psrc_linesize;
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prvpnn = prvp + 2 * psrc_linesize;
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prvp4n = prvp + 4 * psrc_linesize;
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srcp = srcp_saved + 5 * src_linesize - (1 - order) * src_linesize;
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srcpp = srcp - src_linesize;
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srcppp = srcp - 2 * src_linesize;
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srcp3p = srcp - 3 * src_linesize;
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srcp4p = srcp - 4 * src_linesize;
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srcpn = srcp + src_linesize;
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srcpnn = srcp + 2 * src_linesize;
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srcp3n = srcp + 3 * src_linesize;
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srcp4n = srcp + 4 * src_linesize;
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dstp = dstp_saved + 5 * dst_linesize - (1 - order) * dst_linesize;
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for (y = 5 - (1 - order); y <= h - 5 - (1 - order); y += 2) {
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for (x = 0; x < bwidth; x++) {
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if (thresh == 0 || n == 0 ||
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(abs((int)prvp[x] - (int)srcp[x]) > thresh) ||
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(abs((int)prvpp[x] - (int)srcpp[x]) > thresh) ||
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(abs((int)prvpn[x] - (int)srcpn[x]) > thresh)) {
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if (map) {
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g = x & ~3;
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if (is_packed_rgb) {
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AV_WB32(dstp + g, 0xffffffff);
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x = g + 3;
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} else if (inlink->format == AV_PIX_FMT_YUYV422) {
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// y <- 235, u <- 128, y <- 235, v <- 128
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AV_WB32(dstp + g, 0xeb80eb80);
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x = g + 3;
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} else {
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dstp[x] = plane == 0 ? 235 : 128;
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}
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} else {
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if (is_packed_rgb) {
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hi = 255;
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lo = 0;
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} else if (inlink->format == AV_PIX_FMT_YUYV422) {
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hi = x & 1 ? 240 : 235;
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lo = 16;
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} else {
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hi = plane == 0 ? 235 : 240;
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lo = 16;
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}
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if (sharp) {
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if (twoway) {
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valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
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+ 0.170 * ((int)srcp[x] + (int)prvp[x])
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- 0.116 * ((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x])
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- 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
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+ 0.031 * ((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]);
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} else {
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valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
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+ 0.170 * ((int)prvp[x])
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- 0.116 * ((int)prvppp[x] + (int)prvpnn[x])
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- 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
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+ 0.031 * ((int)prvp4p[x] + (int)prvp4p[x]);
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}
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dstp[x] = av_clip(valf, lo, hi);
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} else {
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if (twoway) {
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val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)srcp[x] + (int)prvp[x])
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- (int)(srcppp[x]) - (int)(srcpnn[x])
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- (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
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} else {
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val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)prvp[x])
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- (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
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}
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dstp[x] = av_clip(val, lo, hi);
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}
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}
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} else {
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dstp[x] = srcp[x];
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}
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}
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prvp += 2 * psrc_linesize;
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prvpp += 2 * psrc_linesize;
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prvppp += 2 * psrc_linesize;
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prvpn += 2 * psrc_linesize;
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prvpnn += 2 * psrc_linesize;
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prvp4p += 2 * psrc_linesize;
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prvp4n += 2 * psrc_linesize;
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srcp += 2 * src_linesize;
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srcpp += 2 * src_linesize;
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srcppp += 2 * src_linesize;
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srcp3p += 2 * src_linesize;
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srcp4p += 2 * src_linesize;
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srcpn += 2 * src_linesize;
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srcpnn += 2 * src_linesize;
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srcp3n += 2 * src_linesize;
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srcp4n += 2 * src_linesize;
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dstp += 2 * dst_linesize;
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}
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srcp = inpic->data[plane];
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dstp = kerndeint->tmp_data[plane];
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av_image_copy_plane(dstp, psrc_linesize, srcp, src_linesize, bwidth, h);
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}
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avfilter_unref_buffer(inpic);
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return ff_filter_frame(outlink, outpic);
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}
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static const AVFilterPad kerndeint_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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.min_perms = AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad kerndeint_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_kerndeint = {
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.name = "kerndeint",
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.description = NULL_IF_CONFIG_SMALL("Apply kernel deinterlacing to the input."),
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.priv_size = sizeof(KerndeintContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = kerndeint_inputs,
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.outputs = kerndeint_outputs,
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.priv_class = &kerndeint_class,
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};
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