406 lines
14 KiB
C
406 lines
14 KiB
C
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/*
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* Copyright (c) 2007 Bobby Bingham
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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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/**
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* @file
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* video crop filter
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*/
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#include <stdio.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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#include "libavutil/eval.h"
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#include "libavutil/avstring.h"
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#include "libavutil/internal.h"
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#include "libavutil/libm.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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static const char *const var_names[] = {
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"in_w", "iw", ///< width of the input video
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"in_h", "ih", ///< height of the input video
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"out_w", "ow", ///< width of the cropped video
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"out_h", "oh", ///< height of the cropped video
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"a",
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"sar",
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"dar",
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"hsub",
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"vsub",
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"x",
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"y",
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"n", ///< number of frame
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"pos", ///< position in the file
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"t", ///< timestamp expressed in seconds
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NULL
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};
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enum var_name {
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VAR_IN_W, VAR_IW,
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VAR_IN_H, VAR_IH,
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VAR_OUT_W, VAR_OW,
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VAR_OUT_H, VAR_OH,
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VAR_A,
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VAR_SAR,
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VAR_DAR,
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VAR_HSUB,
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VAR_VSUB,
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VAR_X,
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VAR_Y,
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VAR_N,
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VAR_POS,
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VAR_T,
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VAR_VARS_NB
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};
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typedef struct CropContext {
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const AVClass *class;
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int x; ///< x offset of the non-cropped area with respect to the input area
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int y; ///< y offset of the non-cropped area with respect to the input area
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int w; ///< width of the cropped area
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int h; ///< height of the cropped area
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AVRational out_sar; ///< output sample aspect ratio
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int keep_aspect; ///< keep display aspect ratio when cropping
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int exact; ///< exact cropping, for subsampled formats
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int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
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int hsub, vsub; ///< chroma subsampling
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char *x_expr, *y_expr, *w_expr, *h_expr;
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AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */
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double var_values[VAR_VARS_NB];
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} CropContext;
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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int ret;
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ret = ff_formats_pixdesc_filter(&formats, 0, AV_PIX_FMT_FLAG_BITSTREAM | FF_PIX_FMT_FLAG_SW_FLAT_SUB);
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if (ret < 0)
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return ret;
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return ff_set_common_formats(ctx, formats);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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CropContext *s = ctx->priv;
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av_expr_free(s->x_pexpr);
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s->x_pexpr = NULL;
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av_expr_free(s->y_pexpr);
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s->y_pexpr = NULL;
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}
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static inline int normalize_double(int *n, double d)
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{
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int ret = 0;
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if (isnan(d)) {
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ret = AVERROR(EINVAL);
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} else if (d > INT_MAX || d < INT_MIN) {
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*n = d > INT_MAX ? INT_MAX : INT_MIN;
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ret = AVERROR(EINVAL);
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} else
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*n = lrint(d);
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return ret;
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}
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static int config_input(AVFilterLink *link)
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{
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AVFilterContext *ctx = link->dst;
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CropContext *s = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(link->format);
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int ret;
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const char *expr;
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double res;
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s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = ctx->inputs[0]->w;
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s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = ctx->inputs[0]->h;
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s->var_values[VAR_A] = (float) link->w / link->h;
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s->var_values[VAR_SAR] = link->sample_aspect_ratio.num ? av_q2d(link->sample_aspect_ratio) : 1;
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s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
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s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
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s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
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s->var_values[VAR_X] = NAN;
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s->var_values[VAR_Y] = NAN;
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s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = NAN;
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s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = NAN;
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s->var_values[VAR_N] = 0;
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s->var_values[VAR_T] = NAN;
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s->var_values[VAR_POS] = NAN;
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av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
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if (pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
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s->hsub = 1;
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s->vsub = 1;
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} else {
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s->hsub = pix_desc->log2_chroma_w;
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s->vsub = pix_desc->log2_chroma_h;
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}
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av_expr_parse_and_eval(&res, (expr = s->w_expr),
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var_names, s->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx);
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s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
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var_names, s->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto fail_expr;
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s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = res;
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/* evaluate again ow as it may depend on oh */
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
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var_names, s->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto fail_expr;
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s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res;
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if (normalize_double(&s->w, s->var_values[VAR_OUT_W]) < 0 ||
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normalize_double(&s->h, s->var_values[VAR_OUT_H]) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Too big value or invalid expression for out_w/ow or out_h/oh. "
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"Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
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s->w_expr, s->h_expr);
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return AVERROR(EINVAL);
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}
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if (!s->exact) {
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s->w &= ~((1 << s->hsub) - 1);
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s->h &= ~((1 << s->vsub) - 1);
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}
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av_expr_free(s->x_pexpr);
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av_expr_free(s->y_pexpr);
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s->x_pexpr = s->y_pexpr = NULL;
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if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
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NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
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(ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
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NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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return AVERROR(EINVAL);
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if (s->keep_aspect) {
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AVRational dar = av_mul_q(link->sample_aspect_ratio,
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(AVRational){ link->w, link->h });
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av_reduce(&s->out_sar.num, &s->out_sar.den,
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dar.num * s->h, dar.den * s->w, INT_MAX);
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} else
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s->out_sar = link->sample_aspect_ratio;
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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d -> w:%d h:%d sar:%d/%d\n",
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link->w, link->h, link->sample_aspect_ratio.num, link->sample_aspect_ratio.den,
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s->w, s->h, s->out_sar.num, s->out_sar.den);
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if (s->w <= 0 || s->h <= 0 ||
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s->w > link->w || s->h > link->h) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid too big or non positive size for width '%d' or height '%d'\n",
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s->w, s->h);
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return AVERROR(EINVAL);
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}
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/* set default, required in the case the first computed value for x/y is NAN */
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s->x = (link->w - s->w) / 2;
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s->y = (link->h - s->h) / 2;
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if (!s->exact) {
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s->x &= ~((1 << s->hsub) - 1);
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s->y &= ~((1 << s->vsub) - 1);
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}
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return 0;
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fail_expr:
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av_log(ctx, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
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return ret;
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}
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static int config_output(AVFilterLink *link)
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{
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CropContext *s = link->src->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
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// Hardware frames adjust the cropping regions rather than
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// changing the frame size.
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} else {
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link->w = s->w;
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link->h = s->h;
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}
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link->sample_aspect_ratio = s->out_sar;
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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AVFilterContext *ctx = link->dst;
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CropContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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int i;
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s->var_values[VAR_N] = link->frame_count_out;
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s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
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NAN : frame->pts * av_q2d(link->time_base);
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s->var_values[VAR_POS] = frame->pkt_pos == -1 ?
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NAN : frame->pkt_pos;
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s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
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s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
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/* It is necessary if x is expressed from y */
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s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
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normalize_double(&s->x, s->var_values[VAR_X]);
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normalize_double(&s->y, s->var_values[VAR_Y]);
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if (s->x < 0)
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s->x = 0;
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if (s->y < 0)
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s->y = 0;
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if ((unsigned)s->x + (unsigned)s->w > link->w)
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s->x = link->w - s->w;
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if ((unsigned)s->y + (unsigned)s->h > link->h)
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s->y = link->h - s->h;
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if (!s->exact) {
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s->x &= ~((1 << s->hsub) - 1);
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s->y &= ~((1 << s->vsub) - 1);
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}
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av_log(ctx, AV_LOG_TRACE, "n:%d t:%f pos:%f x:%d y:%d x+w:%d y+h:%d\n",
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(int)s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
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s->x, s->y, s->x+s->w, s->y+s->h);
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if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
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frame->crop_top += s->y;
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frame->crop_left += s->x;
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frame->crop_bottom = frame->height - frame->crop_top - frame->crop_bottom - s->h;
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frame->crop_right = frame->width - frame->crop_left - frame->crop_right - s->w;
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} else {
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frame->width = s->w;
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frame->height = s->h;
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frame->data[0] += s->y * frame->linesize[0];
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frame->data[0] += s->x * s->max_step[0];
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if (!(desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & FF_PSEUDOPAL)) {
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for (i = 1; i < 3; i ++) {
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if (frame->data[i]) {
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frame->data[i] += (s->y >> s->vsub) * frame->linesize[i];
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frame->data[i] += (s->x * s->max_step[i]) >> s->hsub;
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}
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}
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}
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/* alpha plane */
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if (frame->data[3]) {
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frame->data[3] += s->y * frame->linesize[3];
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frame->data[3] += s->x * s->max_step[3];
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}
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}
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return ff_filter_frame(link->dst->outputs[0], frame);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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CropContext *s = ctx->priv;
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int ret;
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if ( !strcmp(cmd, "out_w") || !strcmp(cmd, "w")
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|| !strcmp(cmd, "out_h") || !strcmp(cmd, "h")
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|| !strcmp(cmd, "x") || !strcmp(cmd, "y")) {
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int old_x = s->x;
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int old_y = s->y;
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int old_w = s->w;
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int old_h = s->h;
|
||
|
|
|
||
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
||
|
|
AVFilterLink *inlink = ctx->inputs[0];
|
||
|
|
|
||
|
|
av_opt_set(s, cmd, args, 0);
|
||
|
|
|
||
|
|
if ((ret = config_input(inlink)) < 0) {
|
||
|
|
s->x = old_x;
|
||
|
|
s->y = old_y;
|
||
|
|
s->w = old_w;
|
||
|
|
s->h = old_h;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = config_output(outlink);
|
||
|
|
|
||
|
|
} else
|
||
|
|
ret = AVERROR(ENOSYS);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define OFFSET(x) offsetof(CropContext, x)
|
||
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
|
||
|
|
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
|
||
|
|
|
||
|
|
static const AVOption crop_options[] = {
|
||
|
|
{ "out_w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, TFLAGS },
|
||
|
|
{ "w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, TFLAGS },
|
||
|
|
{ "out_h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, TFLAGS },
|
||
|
|
{ "h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, TFLAGS },
|
||
|
|
{ "x", "set the x crop area expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "(in_w-out_w)/2"}, 0, 0, TFLAGS },
|
||
|
|
{ "y", "set the y crop area expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "(in_h-out_h)/2"}, 0, 0, TFLAGS },
|
||
|
|
{ "keep_aspect", "keep aspect ratio", OFFSET(keep_aspect), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
|
||
|
|
{ "exact", "do exact cropping", OFFSET(exact), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
AVFILTER_DEFINE_CLASS(crop);
|
||
|
|
|
||
|
|
static const AVFilterPad avfilter_vf_crop_inputs[] = {
|
||
|
|
{
|
||
|
|
.name = "default",
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.filter_frame = filter_frame,
|
||
|
|
.config_props = config_input,
|
||
|
|
},
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVFilterPad avfilter_vf_crop_outputs[] = {
|
||
|
|
{
|
||
|
|
.name = "default",
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.config_props = config_output,
|
||
|
|
},
|
||
|
|
{ NULL }
|
||
|
|
};
|
||
|
|
|
||
|
|
AVFilter ff_vf_crop = {
|
||
|
|
.name = "crop",
|
||
|
|
.description = NULL_IF_CONFIG_SMALL("Crop the input video."),
|
||
|
|
.priv_size = sizeof(CropContext),
|
||
|
|
.priv_class = &crop_class,
|
||
|
|
.query_formats = query_formats,
|
||
|
|
.uninit = uninit,
|
||
|
|
.inputs = avfilter_vf_crop_inputs,
|
||
|
|
.outputs = avfilter_vf_crop_outputs,
|
||
|
|
.process_command = process_command,
|
||
|
|
};
|