352 lines
12 KiB
C
352 lines
12 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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static const char *const var_names[] = {
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"E",
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"PHI",
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"PI",
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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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"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_E,
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VAR_PHI,
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VAR_PI,
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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_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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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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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[256], y_expr[256], ow_expr[256], oh_expr[256];
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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 PixelFormat pix_fmts[] = {
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PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
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PIX_FMT_BGR48BE, PIX_FMT_BGR48LE,
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PIX_FMT_ARGB, PIX_FMT_RGBA,
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PIX_FMT_ABGR, PIX_FMT_BGRA,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
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PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
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PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
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PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
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PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
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PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
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PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
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PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
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PIX_FMT_YUV444P, PIX_FMT_YUV422P,
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PIX_FMT_YUV420P, PIX_FMT_YUV411P,
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PIX_FMT_YUV410P, PIX_FMT_YUV440P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
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PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
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PIX_FMT_YUVA420P,
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PIX_FMT_RGB8, PIX_FMT_BGR8,
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PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
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PIX_FMT_PAL8, PIX_FMT_GRAY8,
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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 int init(AVFilterContext *ctx, const char *args)
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{
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CropContext *crop = ctx->priv;
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av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr));
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av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr));
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av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr));
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av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
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if (args)
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sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
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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_descriptors[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_E] = M_E;
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crop->var_values[VAR_PHI] = M_PHI;
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crop->var_values[VAR_PI] = M_PI;
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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_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 = av_pix_fmt_descriptors[link->format].log2_chroma_w;
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crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
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if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_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->oh_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->ow_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->ow_expr, crop->oh_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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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d\n",
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link->w, link->h, crop->w, crop->h);
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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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return 0;
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}
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static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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AVFilterContext *ctx = link->dst;
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CropContext *crop = ctx->priv;
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AVFilterBufferRef *ref2;
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int i;
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ref2 = avfilter_ref_buffer(picref, ~0);
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if (!ref2)
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return AVERROR(ENOMEM);
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ref2->video->w = crop->w;
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ref2->video->h = crop->h;
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crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
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NAN : picref->pts * av_q2d(link->time_base);
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crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
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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 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->x,
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crop->y, crop->x+crop->w, crop->y+crop->h);
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ref2->data[0] += crop->y * ref2->linesize[0];
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ref2->data[0] += crop->x * crop->max_step[0];
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if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL ||
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av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PSEUDOPAL)) {
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for (i = 1; i < 3; i ++) {
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if (ref2->data[i]) {
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ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
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ref2->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 (ref2->data[3]) {
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ref2->data[3] += crop->y * ref2->linesize[3];
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ref2->data[3] += crop->x * crop->max_step[3];
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}
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return ff_start_frame(link->dst->outputs[0], ref2);
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}
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static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = link->dst;
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CropContext *crop = ctx->priv;
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if (y >= crop->y + crop->h || y + h <= crop->y)
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return 0;
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if (y < crop->y) {
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h -= crop->y - y;
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y = crop->y;
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}
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if (y + h > crop->y + crop->h)
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h = crop->y + crop->h - y;
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return ff_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
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}
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static int end_frame(AVFilterLink *link)
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{
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CropContext *crop = link->dst->priv;
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crop->var_values[VAR_N] += 1.0;
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return ff_end_frame(link->dst->outputs[0]);
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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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.query_formats = query_formats,
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.init = init,
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.uninit = uninit,
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.inputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_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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{ .name = NULL}},
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output, },
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{ .name = NULL}},
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};
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