a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
433 lines
15 KiB
C
433 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/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 "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 PixelFormat pix_fmts[] = {
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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_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_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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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[256]; ///< width expression string
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char h_expr[256]; ///< height expression string
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char x_expr[256]; ///< width expression string
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char y_expr[256]; ///< height expression string
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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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int needs_copy;
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} PadContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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PadContext *pad = ctx->priv;
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char color_string[128] = "black";
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av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr));
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av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr));
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av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr));
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av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr));
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if (args)
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sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255s",
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pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string);
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if (av_parse_color(pad->color, color_string, -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_descriptors[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] = (float) 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_INFO, "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 AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
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{
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PadContext *pad = inlink->dst->priv;
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AVFilterBufferRef *picref = ff_get_video_buffer(inlink->dst->outputs[0], perms,
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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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picref->video->w = w;
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picref->video->h = h;
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for (plane = 0; plane < 4 && picref->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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picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
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(pad->y >> vsub) * picref->linesize[plane];
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}
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return picref;
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}
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static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y)
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{
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int64_t x_in_buf, y_in_buf;
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x_in_buf = outpicref->data[plane] - outpicref->buf->data[plane]
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+ (x >> hsub) * pad ->line_step[plane]
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+ (y >> vsub) * outpicref->linesize [plane];
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if(x_in_buf < 0 || x_in_buf % pad->line_step[plane])
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return 1;
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x_in_buf /= pad->line_step[plane];
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av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not
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y_in_buf = x_in_buf / outpicref->buf->linesize[plane];
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x_in_buf %= outpicref->buf->linesize[plane];
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if( y_in_buf<<vsub >= outpicref->buf->h
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|| x_in_buf<<hsub >= outpicref->buf->w)
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return 1;
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return 0;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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PadContext *pad = inlink->dst->priv;
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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int plane;
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for (plane = 0; plane < 4 && outpicref->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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av_assert0(outpicref->buf->w>0 && outpicref->buf->h>0);
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if(outpicref->format != outpicref->buf->format) //unsupported currently
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break;
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outpicref->data[plane] -= (pad->x >> hsub) * pad ->line_step[plane]
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+ (pad->y >> vsub) * outpicref->linesize [plane];
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if( does_clip(pad, outpicref, plane, hsub, vsub, 0, 0)
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|| does_clip(pad, outpicref, plane, hsub, vsub, 0, pad->h-1)
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|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, 0)
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|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, pad->h-1)
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)
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break;
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}
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pad->needs_copy= plane < 4 && outpicref->data[plane];
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if(pad->needs_copy){
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av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
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avfilter_unref_buffer(outpicref);
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outpicref = ff_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
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FFMAX(inlink->w, pad->w),
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FFMAX(inlink->h, pad->h));
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avfilter_copy_buffer_ref_props(outpicref, inpicref);
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}
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inlink->dst->outputs[0]->out_buf = outpicref;
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outpicref->video->w = pad->w;
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outpicref->video->h = pad->h;
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ff_start_frame(inlink->dst->outputs[0], outpicref);
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}
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static void end_frame(AVFilterLink *link)
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{
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ff_end_frame(link->dst->outputs[0]);
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avfilter_unref_buffer(link->cur_buf);
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}
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static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
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{
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PadContext *pad = link->dst->priv;
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int bar_y, bar_h = 0;
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if (slice_dir * before_slice == 1 && y == pad->y) {
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/* top bar */
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bar_y = 0;
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bar_h = pad->y;
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} else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
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/* bottom bar */
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bar_y = pad->y + pad->in_h;
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bar_h = pad->h - pad->in_h - pad->y;
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}
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if (bar_h) {
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ff_draw_rectangle(link->dst->outputs[0]->out_buf->data,
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link->dst->outputs[0]->out_buf->linesize,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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0, bar_y, pad->w, bar_h);
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ff_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
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}
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}
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static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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PadContext *pad = link->dst->priv;
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AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
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AVFilterBufferRef *inpic = link->cur_buf;
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y += pad->y;
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y &= ~((1 << pad->vsub) - 1);
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h &= ~((1 << pad->vsub) - 1);
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if (!h)
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return;
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draw_send_bar_slice(link, y, h, slice_dir, 1);
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/* left border */
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ff_draw_rectangle(outpic->data, outpic->linesize, pad->line, pad->line_step,
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pad->hsub, pad->vsub, 0, y, pad->x, h);
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if(pad->needs_copy){
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ff_copy_rectangle(outpic->data, outpic->linesize,
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inpic->data, inpic->linesize, pad->line_step,
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pad->hsub, pad->vsub,
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pad->x, y, y-pad->y, inpic->video->w, h);
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}
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/* right border */
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ff_draw_rectangle(outpic->data, outpic->linesize,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
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ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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draw_send_bar_slice(link, y, h, slice_dir, -1);
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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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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .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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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_frame, },
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{ .name = NULL}},
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.outputs = (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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