257 lines
8.6 KiB
C
257 lines
8.6 KiB
C
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/*
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* Copyright (c) 2015 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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along 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/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/imgutils.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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#include "video.h"
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typedef struct SwapRectContext {
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const AVClass *class;
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char *w, *h;
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char *x1, *y1;
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char *x2, *y2;
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int nb_planes;
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int pixsteps[4];
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const AVPixFmtDescriptor *desc;
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uint8_t *temp;
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} SwapRectContext;
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#define OFFSET(x) offsetof(SwapRectContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption swaprect_options[] = {
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{ "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
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{ "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
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{ "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
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{ "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
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{ "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
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{ "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(swaprect);
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *pix_fmts = NULL;
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int fmt, ret;
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
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desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
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desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
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(ret = ff_add_format(&pix_fmts, fmt)) < 0)
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return ret;
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}
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return ff_set_common_formats(ctx, pix_fmts);
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}
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static const char *const var_names[] = { "w", "h", "a", "n", "t", "pos", "sar", "dar", NULL };
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enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T, VAR_POS, VAR_SAR, VAR_DAR, VAR_VARS_NB };
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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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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SwapRectContext *s = ctx->priv;
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double var_values[VAR_VARS_NB];
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int x1[4], y1[4];
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int x2[4], y2[4];
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int aw[4], ah[4];
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int lw[4], lh[4];
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int pw[4], ph[4];
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double dw, dh;
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double dx1, dy1;
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double dx2, dy2;
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int y, p, w, h, ret;
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var_values[VAR_W] = inlink->w;
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var_values[VAR_H] = inlink->h;
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var_values[VAR_A] = (float) inlink->w / inlink->h;
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var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
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var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
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var_values[VAR_N] = inlink->frame_count_out;
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var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
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var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
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ret = av_expr_parse_and_eval(&dw, s->w,
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var_names, &var_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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ret = av_expr_parse_and_eval(&dh, s->h,
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var_names, &var_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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ret = av_expr_parse_and_eval(&dx1, s->x1,
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var_names, &var_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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ret = av_expr_parse_and_eval(&dy1, s->y1,
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var_names, &var_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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ret = av_expr_parse_and_eval(&dx2, s->x2,
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var_names, &var_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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ret = av_expr_parse_and_eval(&dy2, s->y2,
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var_names, &var_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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w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
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x1[0] = av_clip(x1[0], 0, inlink->w - 1);
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y1[0] = av_clip(y1[0], 0, inlink->w - 1);
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x2[0] = av_clip(x2[0], 0, inlink->w - 1);
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y2[0] = av_clip(y2[0], 0, inlink->w - 1);
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ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
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ah[0] = ah[3] = h;
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aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
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aw[0] = aw[3] = w;
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w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
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h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
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ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
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ph[0] = ph[3] = h;
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pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
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pw[0] = pw[3] = w;
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lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
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lh[0] = lh[3] = inlink->h;
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lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
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lw[0] = lw[3] = inlink->w;
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x1[1] = x1[2] = AV_CEIL_RSHIFT(x1[0], s->desc->log2_chroma_w);
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x1[0] = x1[3] = x1[0];
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y1[1] = y1[2] = AV_CEIL_RSHIFT(y1[0], s->desc->log2_chroma_h);
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y1[0] = y1[3] = y1[0];
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x2[1] = x2[2] = AV_CEIL_RSHIFT(x2[0], s->desc->log2_chroma_w);
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x2[0] = x2[3] = x2[0];
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y2[1] = y2[2] = AV_CEIL_RSHIFT(y2[0], s->desc->log2_chroma_h);
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y2[0] = y2[3] = y2[0];
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for (p = 0; p < s->nb_planes; p++) {
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if (ph[p] == ah[p] && pw[p] == aw[p]) {
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uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
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uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
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for (y = 0; y < ph[p]; y++) {
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memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
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memmove(src, dst, pw[p] * s->pixsteps[p]);
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memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
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src += in->linesize[p];
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dst += in->linesize[p];
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}
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}
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}
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return ff_filter_frame(outlink, in);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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SwapRectContext *s = ctx->priv;
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if (!s->w || !s->h ||
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!s->x1 || !s->y1 ||
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!s->x2 || !s->y2)
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return AVERROR(EINVAL);
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s->desc = av_pix_fmt_desc_get(inlink->format);
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av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
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if (!s->temp)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SwapRectContext *s = ctx->priv;
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av_freep(&s->temp);
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}
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static const AVFilterPad 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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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad 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 ff_vf_swaprect = {
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.name = "swaprect",
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.description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
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.priv_size = sizeof(SwapRectContext),
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.priv_class = &swaprect_class,
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.query_formats = query_formats,
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.uninit = uninit,
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.inputs = inputs,
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.outputs = outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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