355 lines
13 KiB
C
355 lines
13 KiB
C
/*
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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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/* #define DEBUG */
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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 {
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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 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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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGB48LE,
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AV_PIX_FMT_BGR48BE, AV_PIX_FMT_BGR48LE,
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AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_RGB565BE, AV_PIX_FMT_RGB565LE,
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AV_PIX_FMT_RGB555BE, AV_PIX_FMT_RGB555LE,
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AV_PIX_FMT_BGR565BE, AV_PIX_FMT_BGR565LE,
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AV_PIX_FMT_BGR555BE, AV_PIX_FMT_BGR555LE,
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AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE,
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AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUV420P16BE,
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AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUV422P16BE,
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AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUV444P16BE,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8,
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AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
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AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
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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 av_cold void uninit(AVFilterContext *ctx)
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{
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CropContext *crop = ctx->priv;
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av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL;
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av_expr_free(crop->y_pexpr); crop->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 = round(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 *crop = 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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crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w;
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crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h;
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crop->var_values[VAR_A] = (float) link->w / link->h;
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crop->var_values[VAR_SAR] = link->sample_aspect_ratio.num ? av_q2d(link->sample_aspect_ratio) : 1;
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crop->var_values[VAR_DAR] = crop->var_values[VAR_A] * crop->var_values[VAR_SAR];
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crop->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
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crop->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
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crop->var_values[VAR_X] = NAN;
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crop->var_values[VAR_Y] = NAN;
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crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN;
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crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN;
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crop->var_values[VAR_N] = 0;
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crop->var_values[VAR_T] = NAN;
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crop->var_values[VAR_POS] = NAN;
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av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
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crop->hsub = pix_desc->log2_chroma_w;
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crop->vsub = pix_desc->log2_chroma_h;
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if ((ret = av_expr_parse_and_eval(&res, (expr = crop->w_expr),
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var_names, crop->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
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crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = crop->h_expr),
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var_names, crop->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
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crop->var_values[VAR_OUT_H] = crop->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 = crop->w_expr),
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var_names, crop->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
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crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
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if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 ||
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normalize_double(&crop->h, crop->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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crop->w_expr, crop->h_expr);
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return AVERROR(EINVAL);
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}
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crop->w &= ~((1 << crop->hsub) - 1);
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crop->h &= ~((1 << crop->vsub) - 1);
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if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names,
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NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
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(ret = av_expr_parse(&crop->y_pexpr, crop->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 (crop->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(&crop->out_sar.num, &crop->out_sar.den,
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dar.num * crop->h, dar.den * crop->w, INT_MAX);
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} else
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crop->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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crop->w, crop->h, crop->out_sar.num, crop->out_sar.den);
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if (crop->w <= 0 || crop->h <= 0 ||
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crop->w > link->w || crop->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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crop->w, crop->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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crop->x = (link->w - crop->w) / 2;
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crop->y = (link->h - crop->h) / 2;
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crop->x &= ~((1 << crop->hsub) - 1);
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crop->y &= ~((1 << crop->vsub) - 1);
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return 0;
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fail_expr:
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av_log(NULL, 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 *crop = link->src->priv;
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link->w = crop->w;
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link->h = crop->h;
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link->sample_aspect_ratio = crop->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 *crop = 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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frame->width = crop->w;
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frame->height = crop->h;
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crop->var_values[VAR_N] = link->frame_count;
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crop->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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crop->var_values[VAR_POS] = av_frame_get_pkt_pos(frame) == -1 ?
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NAN : av_frame_get_pkt_pos(frame);
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crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
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crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL);
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crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
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normalize_double(&crop->x, crop->var_values[VAR_X]);
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normalize_double(&crop->y, crop->var_values[VAR_Y]);
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if (crop->x < 0) crop->x = 0;
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if (crop->y < 0) crop->y = 0;
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if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w;
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if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h;
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crop->x &= ~((1 << crop->hsub) - 1);
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crop->y &= ~((1 << crop->vsub) - 1);
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av_dlog(ctx, "n:%d t:%f pos:%f x:%d y:%d x+w:%d y+h:%d\n",
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(int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->var_values[VAR_POS],
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crop->x, crop->y, crop->x+crop->w, crop->y+crop->h);
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frame->data[0] += crop->y * frame->linesize[0];
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frame->data[0] += crop->x * crop->max_step[0];
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if (!(desc->flags & PIX_FMT_PAL || desc->flags & PIX_FMT_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] += (crop->y >> crop->vsub) * frame->linesize[i];
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frame->data[i] += (crop->x * crop->max_step[i]) >> crop->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] += crop->y * frame->linesize[3];
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frame->data[3] += crop->x * crop->max_step[3];
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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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#define OFFSET(x) offsetof(CropContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption crop_options[] = {
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{ "out_w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "out_h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "x", "set the x crop area expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "(in_w-out_w)/2"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set the y crop area expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "(in_h-out_h)/2"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "keep_aspect", "keep aspect ratio", OFFSET(keep_aspect), 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(crop);
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static const AVFilterPad avfilter_vf_crop_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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.get_video_buffer = ff_null_get_video_buffer,
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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 avfilter_vf_crop_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_crop = {
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.name = "crop",
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.description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
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.priv_size = sizeof(CropContext),
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.priv_class = &crop_class,
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.query_formats = query_formats,
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.uninit = uninit,
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.inputs = avfilter_vf_crop_inputs,
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.outputs = avfilter_vf_crop_outputs,
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};
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