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![Ricardo Constantino](/assets/img/avatar_default.png)
or if x/y go beyond padded area. This is mostly useful when paired with the aspect option. Defaults aren't changed. Idea for this was taken from mpv's soon-to-be-removed expand vf. Reviewed-by: Paul B Mahol <onemda@gmail.com>
462 lines
16 KiB
C
462 lines
16 KiB
C
/*
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* Copyright (c) 2008 vmrsss
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* Copyright (c) 2009 Stefano Sabatini
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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 padding filter
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*/
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#include <float.h> /* DBL_MAX */
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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/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "drawutils.h"
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static const char *const var_names[] = {
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"in_w", "iw",
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"in_h", "ih",
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"out_w", "ow",
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"out_h", "oh",
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"x",
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"y",
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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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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_X,
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VAR_Y,
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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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VARS_NB
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};
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static int query_formats(AVFilterContext *ctx)
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{
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return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
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}
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enum EvalMode {
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EVAL_MODE_INIT,
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EVAL_MODE_FRAME,
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EVAL_MODE_NB
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};
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typedef struct PadContext {
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const AVClass *class;
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int w, h; ///< output dimensions, a value of 0 will result in the input size
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int x, y; ///< offsets of the input area with respect to the padded area
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int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
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int inlink_w, inlink_h;
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AVRational aspect;
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char *w_expr; ///< width expression string
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char *h_expr; ///< height expression string
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char *x_expr; ///< width expression string
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char *y_expr; ///< height expression string
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uint8_t rgba_color[4]; ///< color for the padding area
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FFDrawContext draw;
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FFDrawColor color;
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int eval_mode; ///< expression evaluation mode
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} PadContext;
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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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PadContext *s = ctx->priv;
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AVRational adjusted_aspect = s->aspect;
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int ret;
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double var_values[VARS_NB], res;
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char *expr;
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ff_draw_init(&s->draw, inlink->format, 0);
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ff_draw_color(&s->draw, &s->color, s->rgba_color);
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var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
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var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
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var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
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var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
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var_values[VAR_A] = (double) inlink->w / inlink->h;
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var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
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(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
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var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
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var_values[VAR_HSUB] = 1 << s->draw.hsub_max;
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var_values[VAR_VSUB] = 1 << s->draw.vsub_max;
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/* evaluate width and height */
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av_expr_parse_and_eval(&res, (expr = s->w_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx);
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s->w = var_values[VAR_OUT_W] = 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, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto eval_fail;
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s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
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if (!s->h)
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var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h;
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/* evaluate the width again, as it may depend on the evaluated output height */
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto eval_fail;
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s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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if (!s->w)
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var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
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if (adjusted_aspect.num && adjusted_aspect.den) {
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adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
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if (s->h < av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num)) {
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s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num);
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} else {
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s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(s->h, adjusted_aspect.num, adjusted_aspect.den);
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}
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}
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/* evaluate x and y */
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av_expr_parse_and_eval(&res, (expr = s->x_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx);
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s->x = var_values[VAR_X] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto eval_fail;
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s->y = var_values[VAR_Y] = res;
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/* evaluate x again, as it may depend on the evaluated y value */
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto eval_fail;
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s->x = var_values[VAR_X] = res;
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if (s->x < 0 || s->x + inlink->w > s->w)
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s->x = var_values[VAR_X] = (s->w - inlink->w) / 2;
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if (s->y < 0 || s->y + inlink->h > s->h)
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s->y = var_values[VAR_Y] = (s->h - inlink->h) / 2;
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/* sanity check params */
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if (s->w < 0 || s->h < 0) {
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av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");
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return AVERROR(EINVAL);
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}
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s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w);
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s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h);
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s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x);
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s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y);
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s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w);
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s->in_h = ff_draw_round_to_sub(&s->draw, 1, -1, inlink->h);
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s->inlink_w = inlink->w;
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s->inlink_h = inlink->h;
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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n",
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inlink->w, inlink->h, s->w, s->h, s->x, s->y,
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s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]);
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if (s->w <= 0 || s->h <= 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
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s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h);
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return AVERROR(EINVAL);
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}
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return 0;
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eval_fail:
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av_log(NULL, AV_LOG_ERROR,
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"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 *outlink)
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{
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PadContext *s = outlink->src->priv;
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outlink->w = s->w;
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outlink->h = s->h;
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return 0;
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}
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static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
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{
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PadContext *s = inlink->dst->priv;
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AVFrame *frame;
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int plane;
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if (s->inlink_w <= 0)
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return NULL;
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frame = ff_get_video_buffer(inlink->dst->outputs[0],
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w + (s->w - s->in_w),
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h + (s->h - s->in_h) + (s->x > 0));
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if (!frame)
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return NULL;
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frame->width = w;
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frame->height = h;
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for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
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int hsub = s->draw.hsub[plane];
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int vsub = s->draw.vsub[plane];
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frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] +
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(s->y >> vsub) * frame->linesize[plane];
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}
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return frame;
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}
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/* check whether each plane in this buffer can be padded without copying */
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static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
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{
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int planes[4] = { -1, -1, -1, -1}, *p = planes;
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int i, j;
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/* get all planes in this buffer */
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for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
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if (av_frame_get_plane_buffer(frame, i) == buf)
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*p++ = i;
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}
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/* for each plane in this buffer, check that it can be padded without
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* going over buffer bounds or other planes */
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for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
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int hsub = s->draw.hsub[planes[i]];
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int vsub = s->draw.vsub[planes[i]];
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uint8_t *start = frame->data[planes[i]];
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uint8_t *end = start + (frame->height >> vsub) *
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frame->linesize[planes[i]];
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/* amount of free space needed before the start and after the end
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* of the plane */
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ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] +
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(s->y >> vsub) * frame->linesize[planes[i]];
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ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
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s->draw.pixelstep[planes[i]] +
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((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]];
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if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]])
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return 1;
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if (start - buf->data < req_start ||
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(buf->data + buf->size) - end < req_end)
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return 1;
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for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
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int vsub1 = s->draw.vsub[planes[j]];
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uint8_t *start1 = frame->data[planes[j]];
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uint8_t *end1 = start1 + (frame->height >> vsub1) *
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frame->linesize[planes[j]];
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if (i == j)
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continue;
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if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) ||
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FFSIGN(end - start1) != FFSIGN(end - start1 + req_end))
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return 1;
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}
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}
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return 0;
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}
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static int frame_needs_copy(PadContext *s, AVFrame *frame)
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{
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int i;
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if (!av_frame_is_writable(frame))
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return 1;
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for (i = 0; i < 4 && frame->buf[i]; i++)
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if (buffer_needs_copy(s, frame, frame->buf[i]))
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return 1;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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PadContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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int needs_copy;
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if(s->eval_mode == EVAL_MODE_FRAME && (
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in->width != s->inlink_w
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|| in->height != s->inlink_h
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|| in->format != outlink->format
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|| in->sample_aspect_ratio.den != outlink->sample_aspect_ratio.den || in->sample_aspect_ratio.num != outlink->sample_aspect_ratio.num)) {
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int ret;
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inlink->dst->inputs[0]->format = in->format;
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inlink->dst->inputs[0]->w = in->width;
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inlink->dst->inputs[0]->h = in->height;
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inlink->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
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inlink->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
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if ((ret = config_input(inlink)) < 0) {
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s->inlink_w = -1;
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return ret;
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}
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if ((ret = config_output(outlink)) < 0) {
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s->inlink_w = -1;
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return ret;
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}
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}
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needs_copy = frame_needs_copy(s, in);
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if (needs_copy) {
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av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
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out = ff_get_video_buffer(inlink->dst->outputs[0],
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FFMAX(inlink->w, s->w),
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FFMAX(inlink->h, s->h));
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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} else {
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int i;
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out = in;
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for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) {
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int hsub = s->draw.hsub[i];
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int vsub = s->draw.vsub[i];
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out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] +
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(s->y >> vsub) * out->linesize[i];
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}
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}
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/* top bar */
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if (s->y) {
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ff_fill_rectangle(&s->draw, &s->color,
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out->data, out->linesize,
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0, 0, s->w, s->y);
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}
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/* bottom bar */
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if (s->h > s->y + s->in_h) {
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ff_fill_rectangle(&s->draw, &s->color,
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out->data, out->linesize,
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0, s->y + s->in_h, s->w, s->h - s->y - s->in_h);
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}
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/* left border */
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ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
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0, s->y, s->x, in->height);
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if (needs_copy) {
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ff_copy_rectangle2(&s->draw,
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out->data, out->linesize, in->data, in->linesize,
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s->x, s->y, 0, 0, in->width, in->height);
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}
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/* right border */
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ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize,
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s->x + s->in_w, s->y, s->w - s->x - s->in_w,
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in->height);
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out->width = s->w;
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out->height = s->h;
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if (in != out)
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av_frame_free(&in);
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return ff_filter_frame(inlink->dst->outputs[0], out);
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}
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#define OFFSET(x) offsetof(PadContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption pad_options[] = {
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{ "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
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{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
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{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
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{ "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
|
|
{ "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(pad);
|
|
|
|
static const AVFilterPad avfilter_vf_pad_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.get_video_buffer = get_video_buffer,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_pad_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_pad = {
|
|
.name = "pad",
|
|
.description = NULL_IF_CONFIG_SMALL("Pad the input video."),
|
|
.priv_size = sizeof(PadContext),
|
|
.priv_class = &pad_class,
|
|
.query_formats = query_formats,
|
|
.inputs = avfilter_vf_pad_inputs,
|
|
.outputs = avfilter_vf_pad_outputs,
|
|
};
|