2010-11-21 18:39:34 +00:00
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/*
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* Copyright (c) 2010 Stefano Sabatini
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* Copyright (c) 2010 Baptiste Coudurier
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* Copyright (c) 2007 Bobby Bingham
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*
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2011-03-18 17:35:10 +00:00
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* This file is part of Libav.
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2010-11-21 18:39:34 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is free software; you can redistribute it and/or
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2010-11-21 18:39:34 +00:00
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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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2011-03-18 17:35:10 +00:00
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* Libav is distributed in the hope that it will be useful,
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2010-11-21 18:39:34 +00:00
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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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2011-03-18 17:35:10 +00:00
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* License along with Libav; if not, write to the Free Software
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2010-11-21 18:39:34 +00:00
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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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* overlay one video on top of another
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*/
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#include "avfilter.h"
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2012-05-30 08:12:55 +00:00
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#include "formats.h"
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2012-08-06 13:49:32 +00:00
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#include "libavutil/common.h"
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2010-11-21 18:39:34 +00:00
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#include "libavutil/eval.h"
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#include "libavutil/avstring.h"
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2012-10-03 20:34:50 +00:00
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#include "libavutil/avassert.h"
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2010-11-21 18:39:34 +00:00
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#include "libavutil/pixdesc.h"
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2011-02-07 13:37:08 +00:00
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#include "libavutil/imgutils.h"
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2011-06-04 11:58:23 +00:00
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#include "libavutil/mathematics.h"
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2013-02-25 20:21:29 +00:00
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#include "libavutil/opt.h"
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2010-11-21 18:39:34 +00:00
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#include "internal.h"
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2012-05-30 09:20:32 +00:00
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#include "video.h"
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2010-11-21 18:39:34 +00:00
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2012-02-20 08:42:33 +00:00
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static const char *const var_names[] = {
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2010-11-21 18:39:34 +00:00
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"E",
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"PHI",
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"PI",
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"main_w", "W", ///< width of the main video
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"main_h", "H", ///< height of the main video
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"overlay_w", "w", ///< width of the overlay video
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"overlay_h", "h", ///< height of the overlay video
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NULL
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};
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enum var_name {
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VAR_E,
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VAR_PHI,
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VAR_PI,
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VAR_MAIN_W, VAR_MW,
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VAR_MAIN_H, VAR_MH,
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VAR_OVERLAY_W, VAR_OW,
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VAR_OVERLAY_H, VAR_OH,
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VAR_VARS_NB
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};
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#define MAIN 0
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#define OVERLAY 1
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typedef struct {
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2013-02-25 20:21:29 +00:00
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const AVClass *class;
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2010-11-21 18:39:34 +00:00
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int x, y; ///< position of overlayed picture
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int max_plane_step[4]; ///< steps per pixel for each plane
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int hsub, vsub; ///< chroma subsampling values
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2013-02-25 20:21:29 +00:00
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char *x_expr, *y_expr;
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2012-10-03 20:34:50 +00:00
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2012-11-28 07:41:07 +00:00
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AVFrame *main;
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AVFrame *over_prev, *over_next;
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2010-11-21 18:39:34 +00:00
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} OverlayContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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2012-10-03 20:34:50 +00:00
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OverlayContext *s = ctx->priv;
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2010-11-21 18:39:34 +00:00
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2012-11-28 07:41:07 +00:00
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av_frame_free(&s->main);
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av_frame_free(&s->over_prev);
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av_frame_free(&s->over_next);
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2010-11-21 18:39:34 +00:00
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}
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static int query_formats(AVFilterContext *ctx)
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{
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2012-10-06 10:10:34 +00:00
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const enum AVPixelFormat inout_pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE };
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const enum AVPixelFormat blend_pix_fmts[] = { AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE };
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2012-05-30 08:12:55 +00:00
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AVFilterFormats *inout_formats = ff_make_format_list(inout_pix_fmts);
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AVFilterFormats *blend_formats = ff_make_format_list(blend_pix_fmts);
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2010-11-21 18:39:34 +00:00
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2012-05-30 08:12:55 +00:00
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ff_formats_ref(inout_formats, &ctx->inputs [MAIN ]->out_formats);
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ff_formats_ref(blend_formats, &ctx->inputs [OVERLAY]->out_formats);
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ff_formats_ref(inout_formats, &ctx->outputs[MAIN ]->in_formats );
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2010-11-21 18:39:34 +00:00
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return 0;
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}
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static int config_input_main(AVFilterLink *inlink)
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{
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OverlayContext *over = inlink->dst->priv;
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2012-10-06 11:29:37 +00:00
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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
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2010-11-21 18:39:34 +00:00
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av_image_fill_max_pixsteps(over->max_plane_step, NULL, pix_desc);
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over->hsub = pix_desc->log2_chroma_w;
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over->vsub = pix_desc->log2_chroma_h;
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return 0;
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}
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static int config_input_overlay(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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OverlayContext *over = inlink->dst->priv;
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char *expr;
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double var_values[VAR_VARS_NB], res;
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int ret;
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/* Finish the configuration by evaluating the expressions
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now when both inputs are configured. */
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var_values[VAR_E ] = M_E;
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var_values[VAR_PHI] = M_PHI;
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var_values[VAR_PI ] = M_PI;
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var_values[VAR_MAIN_W ] = var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
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var_values[VAR_MAIN_H ] = var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
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var_values[VAR_OVERLAY_W] = var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
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var_values[VAR_OVERLAY_H] = var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
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if ((ret = av_expr_parse_and_eval(&res, (expr = over->x_expr), var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto fail;
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over->x = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = over->y_expr), var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)))
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goto fail;
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over->y = res;
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/* x may depend on y */
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if ((ret = av_expr_parse_and_eval(&res, (expr = over->x_expr), var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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goto fail;
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over->x = res;
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2012-06-25 04:31:38 +00:00
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av_log(ctx, AV_LOG_VERBOSE,
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2010-11-21 18:39:34 +00:00
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"main w:%d h:%d fmt:%s overlay x:%d y:%d w:%d h:%d fmt:%s\n",
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ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
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2012-10-06 11:29:37 +00:00
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av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
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2010-11-21 18:39:34 +00:00
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over->x, over->y,
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ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
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2012-10-06 11:29:37 +00:00
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av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
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2010-11-21 18:39:34 +00:00
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if (over->x < 0 || over->y < 0 ||
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over->x + var_values[VAR_OVERLAY_W] > var_values[VAR_MAIN_W] ||
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over->y + var_values[VAR_OVERLAY_H] > var_values[VAR_MAIN_H]) {
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av_log(ctx, AV_LOG_ERROR,
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"Overlay area (%d,%d)<->(%d,%d) not within the main area (0,0)<->(%d,%d) or zero-sized\n",
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over->x, over->y,
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(int)(over->x + var_values[VAR_OVERLAY_W]),
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(int)(over->y + var_values[VAR_OVERLAY_H]),
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(int)var_values[VAR_MAIN_W], (int)var_values[VAR_MAIN_H]);
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return AVERROR(EINVAL);
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}
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return 0;
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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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AVFilterContext *ctx = outlink->src;
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outlink->w = ctx->inputs[MAIN]->w;
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outlink->h = ctx->inputs[MAIN]->h;
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2012-09-30 07:49:53 +00:00
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outlink->time_base = ctx->inputs[MAIN]->time_base;
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2010-11-21 18:39:34 +00:00
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return 0;
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}
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2012-10-03 20:34:50 +00:00
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static void blend_frame(AVFilterContext *ctx,
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2012-11-28 07:41:07 +00:00
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AVFrame *dst, AVFrame *src,
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2012-10-03 20:34:50 +00:00
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int x, int y)
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2010-11-21 18:39:34 +00:00
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{
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OverlayContext *over = ctx->priv;
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int i, j, k;
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int width, height;
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2012-11-28 07:41:07 +00:00
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int overlay_end_y = y + src->height;
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2010-11-21 18:39:34 +00:00
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int end_y, start_y;
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2012-11-28 07:41:07 +00:00
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width = FFMIN(dst->width - x, src->width);
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end_y = FFMIN(dst->height, overlay_end_y);
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2012-10-03 20:34:50 +00:00
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start_y = FFMAX(y, 0);
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2010-11-21 18:39:34 +00:00
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height = end_y - start_y;
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2012-10-06 10:10:34 +00:00
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if (dst->format == AV_PIX_FMT_BGR24 || dst->format == AV_PIX_FMT_RGB24) {
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2010-11-21 18:39:34 +00:00
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uint8_t *dp = dst->data[0] + x * 3 + start_y * dst->linesize[0];
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uint8_t *sp = src->data[0];
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2012-10-06 10:10:34 +00:00
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int b = dst->format == AV_PIX_FMT_BGR24 ? 2 : 0;
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int r = dst->format == AV_PIX_FMT_BGR24 ? 0 : 2;
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2012-10-03 20:34:50 +00:00
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if (y < 0)
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sp += -y * src->linesize[0];
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2010-11-21 18:39:34 +00:00
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for (i = 0; i < height; i++) {
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uint8_t *d = dp, *s = sp;
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for (j = 0; j < width; j++) {
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d[r] = (d[r] * (0xff - s[3]) + s[0] * s[3] + 128) >> 8;
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d[1] = (d[1] * (0xff - s[3]) + s[1] * s[3] + 128) >> 8;
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d[b] = (d[b] * (0xff - s[3]) + s[2] * s[3] + 128) >> 8;
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d += 3;
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s += 4;
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}
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dp += dst->linesize[0];
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sp += src->linesize[0];
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}
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} else {
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for (i = 0; i < 3; i++) {
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int hsub = i ? over->hsub : 0;
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int vsub = i ? over->vsub : 0;
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uint8_t *dp = dst->data[i] + (x >> hsub) +
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(start_y >> vsub) * dst->linesize[i];
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uint8_t *sp = src->data[i];
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uint8_t *ap = src->data[3];
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int wp = FFALIGN(width, 1<<hsub) >> hsub;
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int hp = FFALIGN(height, 1<<vsub) >> vsub;
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2012-10-03 20:34:50 +00:00
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if (y < 0) {
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sp += ((-y) >> vsub) * src->linesize[i];
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ap += -y * src->linesize[3];
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2010-11-21 18:39:34 +00:00
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}
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for (j = 0; j < hp; j++) {
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uint8_t *d = dp, *s = sp, *a = ap;
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for (k = 0; k < wp; k++) {
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// average alpha for color components, improve quality
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int alpha_v, alpha_h, alpha;
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if (hsub && vsub && j+1 < hp && k+1 < wp) {
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alpha = (a[0] + a[src->linesize[3]] +
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a[1] + a[src->linesize[3]+1]) >> 2;
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} else if (hsub || vsub) {
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alpha_h = hsub && k+1 < wp ?
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(a[0] + a[1]) >> 1 : a[0];
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alpha_v = vsub && j+1 < hp ?
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(a[0] + a[src->linesize[3]]) >> 1 : a[0];
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alpha = (alpha_v + alpha_h) >> 1;
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} else
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alpha = a[0];
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*d = (*d * (0xff - alpha) + *s++ * alpha + 128) >> 8;
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d++;
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a += 1 << hsub;
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}
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dp += dst->linesize[i];
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sp += src->linesize[i];
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ap += (1 << vsub) * src->linesize[3];
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}
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}
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}
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}
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|
2012-11-28 07:41:07 +00:00
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static int filter_frame_main(AVFilterLink *inlink, AVFrame *frame)
|
2012-07-14 07:25:33 +00:00
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{
|
2012-10-03 20:34:50 +00:00
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OverlayContext *s = inlink->dst->priv;
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av_assert0(!s->main);
|
2012-11-27 06:49:45 +00:00
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s->main = frame;
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2012-10-03 20:34:50 +00:00
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2012-07-14 07:25:33 +00:00
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return 0;
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}
|
2010-11-21 18:39:34 +00:00
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2012-11-28 07:41:07 +00:00
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static int filter_frame_overlay(AVFilterLink *inlink, AVFrame *frame)
|
2012-07-14 07:25:33 +00:00
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{
|
2012-10-03 20:34:50 +00:00
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OverlayContext *s = inlink->dst->priv;
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av_assert0(!s->over_next);
|
2012-11-27 06:49:45 +00:00
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s->over_next = frame;
|
2012-10-03 20:34:50 +00:00
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2012-07-14 07:25:33 +00:00
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return 0;
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}
|
2010-11-21 18:39:34 +00:00
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2012-10-03 20:34:50 +00:00
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static int output_frame(AVFilterContext *ctx)
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{
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OverlayContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
|
2012-11-27 06:49:45 +00:00
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int ret = ff_filter_frame(outlink, s->main);
|
2012-10-03 20:34:50 +00:00
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s->main = NULL;
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return ret;
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}
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static int handle_overlay_eof(AVFilterContext *ctx)
|
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{
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OverlayContext *s = ctx->priv;
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if (s->over_prev)
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blend_frame(ctx, s->main, s->over_prev, s->x, s->y);
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return output_frame(ctx);
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}
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static int request_frame(AVFilterLink *outlink)
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2012-04-01 16:51:27 +00:00
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{
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2012-10-03 20:34:50 +00:00
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AVFilterContext *ctx = outlink->src;
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OverlayContext *s = ctx->priv;
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AVRational tb_main = ctx->inputs[MAIN]->time_base;
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AVRational tb_over = ctx->inputs[OVERLAY]->time_base;
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int ret = 0;
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/* get a frame on the main input */
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if (!s->main) {
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ret = ff_request_frame(ctx->inputs[MAIN]);
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if (ret < 0)
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return ret;
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}
|
2012-04-01 16:51:27 +00:00
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|
2012-10-03 20:34:50 +00:00
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/* get a new frame on the overlay input, on EOF
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* reuse previous */
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|
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if (!s->over_next) {
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ret = ff_request_frame(ctx->inputs[OVERLAY]);
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if (ret == AVERROR_EOF)
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return handle_overlay_eof(ctx);
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else if (ret < 0)
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return ret;
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}
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while (s->main->pts != AV_NOPTS_VALUE &&
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s->over_next->pts != AV_NOPTS_VALUE &&
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av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main) < 0) {
|
2012-11-28 07:41:07 +00:00
|
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av_frame_free(&s->over_prev);
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FFSWAP(AVFrame*, s->over_prev, s->over_next);
|
2012-10-03 20:34:50 +00:00
|
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ret = ff_request_frame(ctx->inputs[OVERLAY]);
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|
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if (ret == AVERROR_EOF)
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return handle_overlay_eof(ctx);
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else if (ret < 0)
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return ret;
|
|
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}
|
2012-04-01 16:51:27 +00:00
|
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|
2012-10-03 20:34:50 +00:00
|
|
|
if (s->main->pts == AV_NOPTS_VALUE ||
|
|
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s->over_next->pts == AV_NOPTS_VALUE ||
|
|
|
|
!av_compare_ts(s->over_next->pts, tb_over, s->main->pts, tb_main)) {
|
|
|
|
blend_frame(ctx, s->main, s->over_next, s->x, s->y);
|
2012-11-28 07:41:07 +00:00
|
|
|
av_frame_free(&s->over_prev);
|
|
|
|
FFSWAP(AVFrame*, s->over_prev, s->over_next);
|
2012-10-03 20:34:50 +00:00
|
|
|
} else if (s->over_prev) {
|
|
|
|
blend_frame(ctx, s->main, s->over_prev, s->x, s->y);
|
|
|
|
}
|
|
|
|
|
|
|
|
return output_frame(ctx);
|
2012-04-01 16:51:27 +00:00
|
|
|
}
|
|
|
|
|
2013-02-25 20:21:29 +00:00
|
|
|
#define OFFSET(x) offsetof(OverlayContext, x)
|
|
|
|
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
|
|
|
|
static const AVOption options[] = {
|
|
|
|
{ "x", "Horizontal position of the left edge of the overlaid video on the "
|
|
|
|
"main video.", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
|
|
|
|
{ "y", "Vertical position of the top edge of the overlaid video on the "
|
|
|
|
"main video.", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
|
|
|
|
{ NULL },
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVClass overlay_class = {
|
|
|
|
.class_name = "overlay",
|
|
|
|
.item_name = av_default_item_name,
|
|
|
|
.option = options,
|
|
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
|
|
};
|
|
|
|
|
2012-07-24 13:14:01 +00:00
|
|
|
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
|
|
|
|
{
|
|
|
|
.name = "main",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
|
|
.config_props = config_input_main,
|
2012-11-27 06:49:45 +00:00
|
|
|
.filter_frame = filter_frame_main,
|
2012-11-28 07:41:07 +00:00
|
|
|
.needs_writable = 1,
|
2012-07-24 13:14:01 +00:00
|
|
|
.needs_fifo = 1,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.name = "overlay",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
|
|
.config_props = config_input_overlay,
|
2012-11-27 06:49:45 +00:00
|
|
|
.filter_frame = filter_frame_overlay,
|
2012-07-24 13:14:01 +00:00
|
|
|
.needs_fifo = 1,
|
|
|
|
},
|
|
|
|
{ NULL }
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVFilterPad avfilter_vf_overlay_outputs[] = {
|
|
|
|
{
|
|
|
|
.name = "default",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
|
|
.config_props = config_output,
|
|
|
|
.request_frame = request_frame,
|
|
|
|
},
|
|
|
|
{ NULL }
|
|
|
|
};
|
|
|
|
|
2010-11-21 18:39:34 +00:00
|
|
|
AVFilter avfilter_vf_overlay = {
|
|
|
|
.name = "overlay",
|
|
|
|
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
|
|
|
|
|
|
|
|
.uninit = uninit,
|
|
|
|
|
|
|
|
.priv_size = sizeof(OverlayContext),
|
2013-02-25 20:21:29 +00:00
|
|
|
.priv_class = &overlay_class,
|
2010-11-21 18:39:34 +00:00
|
|
|
|
|
|
|
.query_formats = query_formats,
|
|
|
|
|
2012-07-24 13:14:01 +00:00
|
|
|
.inputs = avfilter_vf_overlay_inputs,
|
|
|
|
.outputs = avfilter_vf_overlay_outputs,
|
2010-11-21 18:39:34 +00:00
|
|
|
};
|