401 lines
14 KiB
C
401 lines
14 KiB
C
/*
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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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* 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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* overlay one video on top of another
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*/
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#include "avfilter.h"
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#include "formats.h"
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#include "libavutil/eval.h"
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#include "libavutil/avstring.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/mathematics.h"
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#include "internal.h"
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#include "video.h"
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static const char *const var_names[] = {
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"E",
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"PHI",
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"PI",
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"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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int x, y; ///< position of overlayed picture
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AVFilterBufferRef *overpicref;
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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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char x_expr[256], y_expr[256];
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} OverlayContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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OverlayContext *over = ctx->priv;
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av_strlcpy(over->x_expr, "0", sizeof(over->x_expr));
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av_strlcpy(over->y_expr, "0", sizeof(over->y_expr));
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if (args)
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sscanf(args, "%255[^:]:%255[^:]", over->x_expr, over->y_expr);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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OverlayContext *over = ctx->priv;
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avfilter_unref_bufferp(&over->overpicref);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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const enum PixelFormat inout_pix_fmts[] = { PIX_FMT_YUV420P, PIX_FMT_NONE };
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const enum PixelFormat blend_pix_fmts[] = { PIX_FMT_YUVA420P, PIX_FMT_NONE };
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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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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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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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const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
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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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av_log(ctx, AV_LOG_VERBOSE,
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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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av_pix_fmt_descriptors[ctx->inputs[MAIN]->format].name,
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over->x, over->y,
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ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
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av_pix_fmt_descriptors[ctx->inputs[OVERLAY]->format].name);
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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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int exact;
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// common timebase computation:
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AVRational tb1 = ctx->inputs[MAIN ]->time_base;
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AVRational tb2 = ctx->inputs[OVERLAY]->time_base;
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AVRational *tb = &ctx->outputs[0]->time_base;
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exact = av_reduce(&tb->num, &tb->den,
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av_gcd((int64_t)tb1.num * tb2.den,
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(int64_t)tb2.num * tb1.den),
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(int64_t)tb1.den * tb2.den, INT_MAX);
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av_log(ctx, AV_LOG_VERBOSE,
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"main_tb:%d/%d overlay_tb:%d/%d -> tb:%d/%d exact:%d\n",
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tb1.num, tb1.den, tb2.num, tb2.den, tb->num, tb->den, exact);
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if (!exact)
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av_log(ctx, AV_LOG_WARNING,
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"Timestamp conversion inexact, timestamp information loss may occurr\n");
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outlink->w = ctx->inputs[MAIN]->w;
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outlink->h = ctx->inputs[MAIN]->h;
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return 0;
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}
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static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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return ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
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}
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static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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AVFilterContext *ctx = inlink->dst;
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OverlayContext *over = ctx->priv;
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outpicref->pts = av_rescale_q(outpicref->pts, ctx->inputs[MAIN]->time_base,
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ctx->outputs[0]->time_base);
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if (!over->overpicref || over->overpicref->pts < outpicref->pts) {
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AVFilterBufferRef *old = over->overpicref;
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over->overpicref = NULL;
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ff_request_frame(ctx->inputs[OVERLAY]);
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if (over->overpicref) {
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if (old)
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avfilter_unref_buffer(old);
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} else
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over->overpicref = old;
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}
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return ff_start_frame(inlink->dst->outputs[0], outpicref);
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}
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static int start_frame_overlay(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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AVFilterContext *ctx = inlink->dst;
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OverlayContext *over = ctx->priv;
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over->overpicref = inpicref;
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over->overpicref->pts = av_rescale_q(inpicref->pts, ctx->inputs[OVERLAY]->time_base,
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ctx->outputs[0]->time_base);
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return 0;
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}
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static void blend_slice(AVFilterContext *ctx,
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AVFilterBufferRef *dst, AVFilterBufferRef *src,
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int x, int y, int w, int h,
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int slice_y, int slice_w, int slice_h)
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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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int overlay_end_y = y+h;
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int slice_end_y = slice_y+slice_h;
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int end_y, start_y;
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width = FFMIN(slice_w - x, w);
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end_y = FFMIN(slice_end_y, overlay_end_y);
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start_y = FFMAX(y, slice_y);
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height = end_y - start_y;
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if (dst->format == PIX_FMT_BGR24 || dst->format == PIX_FMT_RGB24) {
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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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int b = dst->format == PIX_FMT_BGR24 ? 2 : 0;
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int r = dst->format == PIX_FMT_BGR24 ? 0 : 2;
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if (slice_y > y)
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sp += (slice_y - y) * src->linesize[0];
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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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if (slice_y > y) {
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sp += ((slice_y - y) >> vsub) * src->linesize[i];
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ap += (slice_y - y) * src->linesize[3];
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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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static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *outpicref = inlink->cur_buf;
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OverlayContext *over = ctx->priv;
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if (over->overpicref &&
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!(over->x >= outpicref->video->w || over->y >= outpicref->video->h ||
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y+h < over->y || y >= over->y + over->overpicref->video->h)) {
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blend_slice(ctx, outpicref, over->overpicref, over->x, over->y,
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over->overpicref->video->w, over->overpicref->video->h,
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y, outpicref->video->w, h);
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}
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return ff_draw_slice(outlink, y, h, slice_dir);
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}
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static int end_frame(AVFilterLink *inlink)
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{
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return ff_end_frame(inlink->dst->outputs[0]);
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}
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static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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return 0;
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}
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static int null_end_frame(AVFilterLink *inlink)
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{
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return 0;
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}
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static int poll_frame(AVFilterLink *link)
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{
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AVFilterContext *s = link->src;
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OverlayContext *over = s->priv;
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int ret = ff_poll_frame(s->inputs[OVERLAY]);
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if (ret == AVERROR_EOF)
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ret = !!over->overpicref;
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return ret && ff_poll_frame(s->inputs[MAIN]);
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}
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AVFilter avfilter_vf_overlay = {
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.name = "overlay",
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.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(OverlayContext),
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {{ .name = "main",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame,
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.get_video_buffer= get_video_buffer,
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.config_props = config_input_main,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ,
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.rej_perms = AV_PERM_REUSE2|AV_PERM_PRESERVE, },
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{ .name = "overlay",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame_overlay,
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.config_props = config_input_overlay,
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.draw_slice = null_draw_slice,
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.end_frame = null_end_frame,
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.min_perms = AV_PERM_READ,
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.rej_perms = AV_PERM_REUSE2, },
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{ .name = NULL}},
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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.poll_frame = poll_frame },
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{ .name = NULL}},
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};
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