404 lines
14 KiB
C
404 lines
14 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2013 Paul B Mahol
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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
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (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
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/eval.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.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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#include "video.h"
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#define SUB_PIXEL_BITS 8
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#define SUB_PIXELS (1 << SUB_PIXEL_BITS)
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#define COEFF_BITS 11
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#define LINEAR 0
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#define CUBIC 1
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typedef struct PerspectiveContext {
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const AVClass *class;
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char *expr_str[4][2];
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double ref[4][2];
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int32_t (*pv)[2];
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int32_t coeff[SUB_PIXELS][4];
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int interpolation;
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int linesize[4];
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int height[4];
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int hsub, vsub;
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int nb_planes;
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void (*perspective)(struct PerspectiveContext *s,
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uint8_t *dst, int dst_linesize,
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uint8_t *src, int src_linesize,
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int w, int h, int hsub, int vsub);
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} PerspectiveContext;
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#define OFFSET(x) offsetof(PerspectiveContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption perspective_options[] = {
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{ "x0", "set top left x coordinate", OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{ "y0", "set top left y coordinate", OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{ "x1", "set top right x coordinate", OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
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{ "y1", "set top right y coordinate", OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{ "x2", "set bottom left x coordinate", OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{ "y2", "set bottom left y coordinate", OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
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{ "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
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{ "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
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{ "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" },
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{ "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
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{ "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC}, 0, 0, FLAGS, "interpolation" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(perspective);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, 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 inline double get_coeff(double d)
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{
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double coeff, A = -0.60;
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d = fabs(d);
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if (d < 1.0)
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coeff = (1.0 - (A + 3.0) * d * d + (A + 2.0) * d * d * d);
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else if (d < 2.0)
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coeff = (-4.0 * A + 8.0 * A * d - 5.0 * A * d * d + A * d * d * d);
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else
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coeff = 0.0;
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return coeff;
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}
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static const char *const var_names[] = { "W", "H", NULL };
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enum { VAR_W, VAR_H, VAR_VARS_NB };
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static int config_input(AVFilterLink *inlink)
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{
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double x0, x1, x2, x3, x4, x5, x6, x7, q;
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AVFilterContext *ctx = inlink->dst;
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PerspectiveContext *s = ctx->priv;
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double (*ref)[2] = s->ref;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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double values[VAR_VARS_NB] = { [VAR_W] = inlink->w, [VAR_H] = inlink->h };
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int h = inlink->h;
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int w = inlink->w;
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int x, y, i, j, ret;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 2; j++) {
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if (!s->expr_str[i][j])
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return AVERROR(EINVAL);
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ret = av_expr_parse_and_eval(&s->ref[i][j], s->expr_str[i][j],
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var_names, &values[0],
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NULL, NULL, NULL, NULL,
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0, 0, ctx);
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if (ret < 0)
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return ret;
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}
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}
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s->hsub = desc->log2_chroma_w;
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s->vsub = desc->log2_chroma_h;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
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return ret;
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s->height[1] = s->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->height[0] = s->height[3] = inlink->h;
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s->pv = av_realloc_f(s->pv, w * h, 2 * sizeof(*s->pv));
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if (!s->pv)
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return AVERROR(ENOMEM);
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x6 = ((ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
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(ref[2][1] - ref[3][1]) -
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( ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
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(ref[2][0] - ref[3][0])) * h;
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x7 = ((ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
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(ref[1][0] - ref[3][0]) -
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( ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
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(ref[1][1] - ref[3][1])) * w;
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q = ( ref[1][0] - ref[3][0]) * (ref[2][1] - ref[3][1]) -
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( ref[2][0] - ref[3][0]) * (ref[1][1] - ref[3][1]);
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x0 = q * (ref[1][0] - ref[0][0]) * h + x6 * ref[1][0];
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x1 = q * (ref[2][0] - ref[0][0]) * w + x7 * ref[2][0];
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x2 = q * ref[0][0] * w * h;
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x3 = q * (ref[1][1] - ref[0][1]) * h + x6 * ref[1][1];
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x4 = q * (ref[2][1] - ref[0][1]) * w + x7 * ref[2][1];
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x5 = q * ref[0][1] * w * h;
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for (y = 0; y < h; y++){
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for (x = 0; x < w; x++){
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int u, v;
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u = (int)floor(SUB_PIXELS * (x0 * x + x1 * y + x2) /
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(x6 * x + x7 * y + q * w * h) + 0.5);
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v = (int)floor(SUB_PIXELS * (x3 * x + x4 * y + x5) /
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(x6 * x + x7 * y + q * w * h) + 0.5);
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s->pv[x + y * w][0] = u;
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s->pv[x + y * w][1] = v;
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}
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}
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for (i = 0; i < SUB_PIXELS; i++){
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double d = i / (double)SUB_PIXELS;
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double temp[4];
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double sum = 0;
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for (j = 0; j < 4; j++)
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temp[j] = get_coeff(j - d - 1);
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for (j = 0; j < 4; j++)
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sum += temp[j];
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for (j = 0; j < 4; j++)
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s->coeff[i][j] = (int)floor((1 << COEFF_BITS) * temp[j] / sum + 0.5);
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}
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return 0;
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}
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static void resample_cubic(PerspectiveContext *s,
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uint8_t *dst, int dst_linesize,
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uint8_t *src, int src_linesize,
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int w, int h, int hsub, int vsub)
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{
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const int linesize = s->linesize[0];
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int x, y;
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for (y = 0; y < h; y++) {
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int sy = y << vsub;
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for (x = 0; x < w; x++) {
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int u, v, subU, subV, sum, sx;
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sx = x << hsub;
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u = s->pv[sx + sy * linesize][0] >> hsub;
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v = s->pv[sx + sy * linesize][1] >> vsub;
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subU = u & (SUB_PIXELS - 1);
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subV = v & (SUB_PIXELS - 1);
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u >>= SUB_PIXEL_BITS;
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v >>= SUB_PIXEL_BITS;
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if (u > 0 && v > 0 && u < w - 2 && v < h - 2){
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const int index = u + v*src_linesize;
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const int a = s->coeff[subU][0];
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const int b = s->coeff[subU][1];
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const int c = s->coeff[subU][2];
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const int d = s->coeff[subU][3];
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sum = s->coeff[subV][0] * (a * src[index - 1 - src_linesize] + b * src[index - 0 - src_linesize] +
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c * src[index + 1 - src_linesize] + d * src[index + 2 - src_linesize]) +
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s->coeff[subV][1] * (a * src[index - 1 ] + b * src[index - 0 ] +
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c * src[index + 1 ] + d * src[index + 2 ]) +
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s->coeff[subV][2] * (a * src[index - 1 + src_linesize] + b * src[index - 0 + src_linesize] +
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c * src[index + 1 + src_linesize] + d * src[index + 2 + src_linesize]) +
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s->coeff[subV][3] * (a * src[index - 1 + 2 * src_linesize] + b * src[index - 0 + 2 * src_linesize] +
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c * src[index + 1 + 2 * src_linesize] + d * src[index + 2 + 2 * src_linesize]);
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} else {
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int dx, dy;
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sum = 0;
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for (dy = 0; dy < 4; dy++) {
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int iy = v + dy - 1;
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if (iy < 0)
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iy = 0;
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else if (iy >= h)
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iy = h-1;
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for (dx = 0; dx < 4; dx++) {
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int ix = u + dx - 1;
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if (ix < 0)
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ix = 0;
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else if (ix >= w)
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ix = w - 1;
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sum += s->coeff[subU][dx] * s->coeff[subV][dy] * src[ ix + iy * src_linesize];
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}
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}
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}
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sum = (sum + (1<<(COEFF_BITS * 2 - 1))) >> (COEFF_BITS * 2);
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sum = av_clip(sum, 0, 255);
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dst[x + y * dst_linesize] = sum;
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}
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}
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}
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static void resample_linear(PerspectiveContext *s,
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uint8_t *dst, int dst_linesize,
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uint8_t *src, int src_linesize,
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int w, int h, int hsub, int vsub)
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{
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const int linesize = s->linesize[0];
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int x, y;
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for (y = 0; y < h; y++){
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int sy = y << vsub;
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for (x = 0; x < w; x++){
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int u, v, subU, subV, sum, sx, index, subUI, subVI;
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sx = x << hsub;
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u = s->pv[sx + sy * linesize][0] >> hsub;
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v = s->pv[sx + sy * linesize][1] >> vsub;
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subU = u & (SUB_PIXELS - 1);
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subV = v & (SUB_PIXELS - 1);
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u >>= SUB_PIXEL_BITS;
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v >>= SUB_PIXEL_BITS;
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index = u + v * src_linesize;
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subUI = SUB_PIXELS - subU;
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subVI = SUB_PIXELS - subV;
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if ((unsigned)u < (unsigned)(w - 1)){
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if((unsigned)v < (unsigned)(h - 1)){
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sum = subVI * (subUI * src[index] + subU * src[index + 1]) +
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subV * (subUI * src[index + src_linesize] + subU * src[index + src_linesize + 1]);
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sum = (sum + (1 << (SUB_PIXEL_BITS * 2 - 1)))>> (SUB_PIXEL_BITS * 2);
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} else {
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if (v < 0)
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v = 0;
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else
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v = h - 1;
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index = u + v * src_linesize;
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sum = subUI * src[index] + subU * src[index + 1];
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sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
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}
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} else {
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if (u < 0)
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u = 0;
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else
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u = w - 1;
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if ((unsigned)v < (unsigned)(h - 1)){
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index = u + v * src_linesize;
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sum = subVI * src[index] + subV * src[index + src_linesize];
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sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
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} else {
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if (v < 0)
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v = 0;
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else
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v = h - 1;
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index = u + v * src_linesize;
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sum = src[index];
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}
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}
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sum = av_clip(sum, 0, 255);
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dst[x + y * dst_linesize] = sum;
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}
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}
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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PerspectiveContext *s = ctx->priv;
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switch (s->interpolation) {
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case LINEAR: s->perspective = resample_linear; break;
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case CUBIC: s->perspective = resample_cubic; break;
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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PerspectiveContext *s = ctx->priv;
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AVFrame *out;
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int plane;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, frame);
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for (plane = 0; plane < s->nb_planes; plane++) {
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int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
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int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
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s->perspective(s, out->data[plane], out->linesize[plane],
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frame->data[plane], frame->linesize[plane],
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s->linesize[plane], s->height[plane], hsub, vsub);
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}
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av_frame_free(&frame);
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return ff_filter_frame(outlink, out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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PerspectiveContext *s = ctx->priv;
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av_freep(&s->pv);
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}
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static const AVFilterPad perspective_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_input,
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},
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{ NULL }
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};
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static const AVFilterPad perspective_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_perspective = {
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.name = "perspective",
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.description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
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.priv_size = sizeof(PerspectiveContext),
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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 = perspective_inputs,
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.outputs = perspective_outputs,
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.priv_class = &perspective_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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