464 lines
15 KiB
C
464 lines
15 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 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 padding filter
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*/
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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/avassert.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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"PI",
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"PHI",
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"E",
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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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"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_PI,
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VAR_PHI,
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VAR_E,
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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_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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static const enum AVPixelFormat pix_fmts[] = {
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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_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_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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typedef struct {
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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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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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char *color_str;
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uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
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uint8_t *line[4];
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int line_step[4];
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int hsub, vsub; ///< chroma subsampling values
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} PadContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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PadContext *pad = ctx->priv;
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if (av_parse_color(pad->color, pad->color_str, -1, ctx) < 0)
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return AVERROR(EINVAL);
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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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PadContext *pad = ctx->priv;
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int i;
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for (i = 0; i < 4; i++) {
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av_freep(&pad->line[i]);
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pad->line_step[i] = 0;
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}
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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PadContext *pad = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
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uint8_t rgba_color[4];
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int ret, is_packed_rgba;
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double var_values[VARS_NB], res;
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char *expr;
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pad->hsub = pix_desc->log2_chroma_w;
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pad->vsub = pix_desc->log2_chroma_h;
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var_values[VAR_PI] = M_PI;
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var_values[VAR_PHI] = M_PHI;
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var_values[VAR_E] = M_E;
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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_HSUB] = 1<<pad->hsub;
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var_values[VAR_VSUB] = 1<<pad->vsub;
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/* evaluate width and height */
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av_expr_parse_and_eval(&res, (expr = pad->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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pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = pad->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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pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
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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 = pad->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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pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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/* evaluate x and y */
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av_expr_parse_and_eval(&res, (expr = pad->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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pad->x = var_values[VAR_X] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = pad->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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pad->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 = pad->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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pad->x = var_values[VAR_X] = res;
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/* sanity check params */
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if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 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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if (!pad->w)
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pad->w = inlink->w;
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if (!pad->h)
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pad->h = inlink->h;
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pad->w &= ~((1 << pad->hsub) - 1);
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pad->h &= ~((1 << pad->vsub) - 1);
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pad->x &= ~((1 << pad->hsub) - 1);
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pad->y &= ~((1 << pad->vsub) - 1);
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pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
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pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
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memcpy(rgba_color, pad->color, sizeof(rgba_color));
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ff_fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
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inlink->format, rgba_color, &is_packed_rgba, NULL);
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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[%s]\n",
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inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y,
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pad->color[0], pad->color[1], pad->color[2], pad->color[3],
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is_packed_rgba ? "rgba" : "yuva");
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if (pad->x < 0 || pad->y < 0 ||
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pad->w <= 0 || pad->h <= 0 ||
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(unsigned)pad->x + (unsigned)inlink->w > pad->w ||
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(unsigned)pad->y + (unsigned)inlink->h > pad->h) {
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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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pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->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 *pad = outlink->src->priv;
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outlink->w = pad->w;
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outlink->h = pad->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 *pad = inlink->dst->priv;
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AVFrame *frame = ff_get_video_buffer(inlink->dst->outputs[0],
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w + (pad->w - pad->in_w),
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h + (pad->h - pad->in_h));
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int plane;
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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]; plane++) {
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int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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frame->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
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(pad->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 = (planes[i] == 1 || planes[i] == 2) ? s->hsub : 0;
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int vsub = (planes[i] == 1 || planes[i] == 2) ? s->vsub : 0;
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uint8_t *start = frame->data[planes[i]];
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uint8_t *end = start + (frame->height >> hsub) *
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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->line_step[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->line_step[planes[i]] +
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(s->y >> vsub) * frame->linesize[planes[i]];
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if (frame->linesize[planes[i]] < (s->w >> hsub) * s->line_step[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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#define SIGN(x) ((x) > 0 ? 1 : -1)
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for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
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int hsub1 = (planes[j] == 1 || planes[j] == 2) ? s->hsub : 0;
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uint8_t *start1 = frame->data[planes[j]];
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uint8_t *end1 = start1 + (frame->height >> hsub1) *
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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 (SIGN(start - end1) != SIGN(start - end1 - req_start) ||
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SIGN(end - start1) != SIGN(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 < FF_ARRAY_ELEMS(frame->buf) && 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 *pad = inlink->dst->priv;
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AVFrame *out;
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int needs_copy = frame_needs_copy(pad, 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, pad->w),
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FFMAX(inlink->h, pad->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 < FF_ARRAY_ELEMS(out->data) && out->data[i]; i++) {
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int hsub = (i == 1 || i == 2) ? pad->hsub : 0;
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int vsub = (i == 1 || i == 2) ? pad->vsub : 0;
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out->data[i] -= (pad->x >> hsub) * pad->line_step[i] +
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(pad->y >> vsub) * out->linesize[i];
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}
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}
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/* top bar */
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if (pad->y) {
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ff_draw_rectangle(out->data, out->linesize,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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0, 0, pad->w, pad->y);
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}
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/* bottom bar */
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if (pad->h > pad->y + pad->in_h) {
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ff_draw_rectangle(out->data, out->linesize,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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0, pad->y + pad->in_h, pad->w, pad->h - pad->y - pad->in_h);
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}
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/* left border */
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ff_draw_rectangle(out->data, out->linesize, pad->line, pad->line_step,
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pad->hsub, pad->vsub, 0, pad->y, pad->x, in->height);
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if (needs_copy) {
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ff_copy_rectangle(out->data, out->linesize, in->data, in->linesize,
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pad->line_step, pad->hsub, pad->vsub,
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pad->x, pad->y, 0, in->width, in->height);
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}
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/* right border */
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ff_draw_rectangle(out->data, out->linesize,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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pad->x + pad->in_w, pad->y, pad->w - pad->x - pad->in_w,
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in->height);
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out->width = pad->w;
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out->height = pad->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_VIDEO_PARAM
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static const AVOption options[] = {
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{ "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str = "iw" }, .flags = FLAGS },
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{ "height", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str = "ih" }, .flags = FLAGS },
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{ "x", "Horizontal position of the left edge of the input video in the "
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"output video", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "y", "Vertical position of the top edge of the input video in the "
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"output video", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "color", "Color of the padded area", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
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{ NULL },
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};
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static const AVClass pad_class = {
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.class_name = "pad",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_pad_inputs[] = {
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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_input,
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.get_video_buffer = get_video_buffer,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_pad_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_pad = {
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.name = "pad",
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.description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
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.priv_size = sizeof(PadContext),
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.priv_class = &pad_class,
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.init = init,
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.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = avfilter_vf_pad_inputs,
|
|
|
|
.outputs = avfilter_vf_pad_outputs,
|
|
};
|