659 lines
22 KiB
C
659 lines
22 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 FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* overlay one video on top of another
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*/
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/* #define DEBUG */
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#include "avfilter.h"
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#include "formats.h"
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.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 "libavutil/timestamp.h"
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#include "internal.h"
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#include "bufferqueue.h"
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#include "drawutils.h"
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#include "video.h"
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static const char *const var_names[] = {
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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_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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#define R 0
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#define G 1
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#define B 2
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#define A 3
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#define Y 0
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#define U 1
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#define V 2
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typedef struct {
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const AVClass *class;
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int x, y; ///< position of overlayed picture
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int allow_packed_rgb;
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uint8_t frame_requested;
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uint8_t overlay_eof;
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uint8_t main_is_packed_rgb;
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uint8_t main_rgba_map[4];
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uint8_t main_has_alpha;
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uint8_t overlay_is_packed_rgb;
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uint8_t overlay_rgba_map[4];
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uint8_t overlay_has_alpha;
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AVFilterBufferRef *overpicref;
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struct FFBufQueue queue_main;
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struct FFBufQueue queue_over;
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int main_pix_step[4]; ///< steps per pixel for each plane of the main output
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int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
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int hsub, vsub; ///< chroma subsampling values
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char *x_expr, *y_expr;
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} OverlayContext;
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#define OFFSET(x) offsetof(OverlayContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption overlay_options[] = {
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{ "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{"rgb", "force packed RGB in input and output", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(overlay);
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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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char *args1 = av_strdup(args);
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char *expr, *bufptr = NULL;
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int ret = 0;
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over->class = &overlay_class;
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av_opt_set_defaults(over);
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if (expr = av_strtok(args1, ":", &bufptr)) {
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av_free(over->x_expr);
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if (!(over->x_expr = av_strdup(expr))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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}
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if (expr = av_strtok(NULL, ":", &bufptr)) {
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av_free(over->y_expr);
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if (!(over->y_expr = av_strdup(expr))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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}
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if (bufptr && (ret = av_set_options_string(over, bufptr, "=", ":")) < 0)
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goto end;
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end:
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av_free(args1);
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return ret;
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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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av_freep(&over->x_expr);
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av_freep(&over->y_expr);
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avfilter_unref_bufferp(&over->overpicref);
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ff_bufqueue_discard_all(&over->queue_main);
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ff_bufqueue_discard_all(&over->queue_over);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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OverlayContext *over = ctx->priv;
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/* overlay formats contains alpha, for avoiding conversion with alpha information loss */
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const enum AVPixelFormat main_pix_fmts_yuv[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE };
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const enum AVPixelFormat overlay_pix_fmts_yuv[] = { AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE };
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const enum AVPixelFormat main_pix_fmts_rgb[] = {
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AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_NONE
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};
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const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
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AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *main_formats;
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AVFilterFormats *overlay_formats;
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if (over->allow_packed_rgb) {
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main_formats = ff_make_format_list(main_pix_fmts_rgb);
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overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
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} else {
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main_formats = ff_make_format_list(main_pix_fmts_yuv);
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overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv);
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}
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ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
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ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
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ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
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return 0;
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}
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static const enum AVPixelFormat alpha_pix_fmts[] = {
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AV_PIX_FMT_YUVA420P, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
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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_desc_get(inlink->format);
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av_image_fill_max_pixsteps(over->main_pix_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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over->main_is_packed_rgb =
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ff_fill_rgba_map(over->main_rgba_map, inlink->format) >= 0;
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over->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
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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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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
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av_image_fill_max_pixsteps(over->overlay_pix_step, NULL, pix_desc);
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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_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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over->overlay_is_packed_rgb =
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ff_fill_rgba_map(over->overlay_rgba_map, inlink->format) >= 0;
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over->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
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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_get_pix_fmt_name(ctx->inputs[MAIN]->format),
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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_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
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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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outlink->time_base = ctx->inputs[MAIN]->time_base;
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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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// divide by 255 and round to nearest
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// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
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#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
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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 (over->main_is_packed_rgb) {
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uint8_t *dp = dst->data[0] + x * over->main_pix_step[0] +
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start_y * dst->linesize[0];
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uint8_t *sp = src->data[0];
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uint8_t alpha; ///< the amount of overlay to blend on to main
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const int dr = over->main_rgba_map[R];
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const int dg = over->main_rgba_map[G];
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const int db = over->main_rgba_map[B];
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const int da = over->main_rgba_map[A];
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const int dstep = over->main_pix_step[0];
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const int sr = over->overlay_rgba_map[R];
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const int sg = over->overlay_rgba_map[G];
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const int sb = over->overlay_rgba_map[B];
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const int sa = over->overlay_rgba_map[A];
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const int sstep = over->overlay_pix_step[0];
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const int main_has_alpha = over->main_has_alpha;
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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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alpha = s[sa];
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// if the main channel has an alpha channel, alpha has to be calculated
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// to create an un-premultiplied (straight) alpha value
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if (main_has_alpha && alpha != 0 && alpha != 255) {
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// apply the general equation:
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// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
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alpha =
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// the next line is a faster version of: 255 * 255 * alpha
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( (alpha << 16) - (alpha << 9) + alpha )
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/
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// the next line is a faster version of: 255 * (alpha + d[da])
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( ((alpha + d[da]) << 8 ) - (alpha + d[da])
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- d[da] * alpha );
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}
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switch (alpha) {
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case 0:
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break;
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case 255:
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d[dr] = s[sr];
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d[dg] = s[sg];
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d[db] = s[sb];
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break;
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default:
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// main_value = main_value * (1 - alpha) + overlay_value * alpha
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// since alpha is in the range 0-255, the result must divided by 255
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d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
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d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
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d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
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}
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if (main_has_alpha) {
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switch (alpha) {
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case 0:
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break;
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case 255:
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d[da] = s[sa];
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break;
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default:
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// apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
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d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
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}
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}
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d += dstep;
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s += sstep;
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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 = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
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s++;
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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 try_start_frame(AVFilterContext *ctx, AVFilterBufferRef *mainpic)
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{
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OverlayContext *over = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *next_overpic, *outpicref;
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int ret;
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/* Discard obsolete overlay frames: if there is a next frame with pts is
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* before the main frame, we can drop the current overlay. */
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while (1) {
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next_overpic = ff_bufqueue_peek(&over->queue_over, 0);
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if (!next_overpic || av_compare_ts(next_overpic->pts, ctx->inputs[OVERLAY]->time_base,
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mainpic->pts , ctx->inputs[MAIN]->time_base) > 0)
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break;
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ff_bufqueue_get(&over->queue_over);
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avfilter_unref_buffer(over->overpicref);
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over->overpicref = next_overpic;
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}
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/* If there is no next frame and no EOF and the overlay frame is before
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* the main frame, we can not know yet if it will be superseded. */
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if (!over->queue_over.available && !over->overlay_eof &&
|
|
(!over->overpicref || av_compare_ts(over->overpicref->pts, ctx->inputs[OVERLAY]->time_base,
|
|
mainpic->pts , ctx->inputs[MAIN]->time_base) < 0))
|
|
return AVERROR(EAGAIN);
|
|
/* At this point, we know that the current overlay frame extends to the
|
|
* time of the main frame. */
|
|
outlink->out_buf = outpicref = avfilter_ref_buffer(mainpic, ~0);
|
|
|
|
av_dlog(ctx, "main_pts:%s main_pts_time:%s",
|
|
av_ts2str(outpicref->pts), av_ts2timestr(outpicref->pts, &outlink->time_base));
|
|
if (over->overpicref)
|
|
av_dlog(ctx, " over_pts:%s over_pts_time:%s",
|
|
av_ts2str(over->overpicref->pts), av_ts2timestr(over->overpicref->pts, &outlink->time_base));
|
|
av_dlog(ctx, "\n");
|
|
|
|
ret = ff_start_frame(ctx->outputs[0], avfilter_ref_buffer(outpicref, ~0));
|
|
over->frame_requested = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int try_start_next_frame(AVFilterContext *ctx)
|
|
{
|
|
OverlayContext *over = ctx->priv;
|
|
AVFilterBufferRef *next_mainpic = ff_bufqueue_peek(&over->queue_main, 0);
|
|
int ret;
|
|
|
|
if (!next_mainpic)
|
|
return AVERROR(EAGAIN);
|
|
if ((ret = try_start_frame(ctx, next_mainpic)) == AVERROR(EAGAIN))
|
|
return ret;
|
|
avfilter_unref_buffer(ff_bufqueue_get(&over->queue_main));
|
|
return ret;
|
|
}
|
|
|
|
static int try_push_frame(AVFilterContext *ctx)
|
|
{
|
|
OverlayContext *over = ctx->priv;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFilterBufferRef *outpicref;
|
|
int ret;
|
|
|
|
if ((ret = try_start_next_frame(ctx)) < 0)
|
|
return ret;
|
|
outpicref = outlink->out_buf;
|
|
if (over->overpicref)
|
|
blend_slice(ctx, outpicref, over->overpicref, over->x, over->y,
|
|
over->overpicref->video->w, over->overpicref->video->h,
|
|
0, outpicref->video->w, outpicref->video->h);
|
|
if ((ret = ff_draw_slice(outlink, 0, outpicref->video->h, +1)) < 0 ||
|
|
(ret = ff_end_frame(outlink)) < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
static int flush_frames(AVFilterContext *ctx)
|
|
{
|
|
int ret;
|
|
|
|
while (!(ret = try_push_frame(ctx)));
|
|
return ret == AVERROR(EAGAIN) ? 0 : ret;
|
|
}
|
|
|
|
static int start_frame_main(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
OverlayContext *over = ctx->priv;
|
|
int ret;
|
|
|
|
if ((ret = flush_frames(ctx)) < 0)
|
|
return ret;
|
|
if ((ret = try_start_frame(ctx, inpicref)) < 0) {
|
|
if (ret != AVERROR(EAGAIN))
|
|
return ret;
|
|
ff_bufqueue_add(ctx, &over->queue_main, inpicref);
|
|
av_assert1(inpicref == inlink->cur_buf);
|
|
inlink->cur_buf = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int draw_slice_main(AVFilterLink *inlink, int y, int h, int slice_dir)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
OverlayContext *over = ctx->priv;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFilterBufferRef *outpicref = outlink->out_buf;
|
|
|
|
if (!outpicref)
|
|
return 0;
|
|
if (over->overpicref &&
|
|
y + h > over->y && y < over->y + over->overpicref->video->h) {
|
|
blend_slice(ctx, outpicref, over->overpicref, over->x, over->y,
|
|
over->overpicref->video->w, over->overpicref->video->h,
|
|
y, outpicref->video->w, h);
|
|
}
|
|
return ff_draw_slice(outlink, y, h, slice_dir);
|
|
}
|
|
|
|
static int end_frame_main(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFilterBufferRef *outpicref = outlink->out_buf;
|
|
flush_frames(ctx);
|
|
|
|
if (!outpicref)
|
|
return 0;
|
|
return ff_end_frame(ctx->outputs[0]);
|
|
}
|
|
|
|
static int start_frame_over(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int end_frame_over(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
OverlayContext *over = ctx->priv;
|
|
AVFilterBufferRef *inpicref = inlink->cur_buf;
|
|
int ret;
|
|
|
|
inlink->cur_buf = NULL;
|
|
|
|
if ((ret = flush_frames(ctx)) < 0)
|
|
return ret;
|
|
ff_bufqueue_add(ctx, &over->queue_over, inpicref);
|
|
ret = try_push_frame(ctx);
|
|
return ret == AVERROR(EAGAIN) ? 0 : ret;
|
|
}
|
|
|
|
static int request_frame(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
OverlayContext *over = ctx->priv;
|
|
int input, ret;
|
|
|
|
if (!try_push_frame(ctx))
|
|
return 0;
|
|
over->frame_requested = 1;
|
|
while (over->frame_requested) {
|
|
/* TODO if we had a frame duration, we could guess more accurately */
|
|
input = !over->overlay_eof && (over->queue_main.available ||
|
|
over->queue_over.available < 2) ?
|
|
OVERLAY : MAIN;
|
|
ret = ff_request_frame(ctx->inputs[input]);
|
|
/* EOF on main is reported immediately */
|
|
if (ret == AVERROR_EOF && input == OVERLAY) {
|
|
over->overlay_eof = 1;
|
|
if ((ret = try_start_next_frame(ctx)) != AVERROR(EAGAIN))
|
|
return ret;
|
|
ret = 0; /* continue requesting frames on main */
|
|
}
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
|
|
{
|
|
.name = "main",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer= get_video_buffer,
|
|
.config_props = config_input_main,
|
|
.start_frame = start_frame_main,
|
|
.draw_slice = draw_slice_main,
|
|
.end_frame = end_frame_main,
|
|
.min_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE,
|
|
},
|
|
{
|
|
.name = "overlay",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input_overlay,
|
|
.start_frame = start_frame_over,
|
|
.draw_slice = null_draw_slice,
|
|
.end_frame = end_frame_over,
|
|
.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_overlay_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.rej_perms = AV_PERM_WRITE,
|
|
.config_props = config_output,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_overlay = {
|
|
.name = "overlay",
|
|
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
|
|
|
|
.init = init,
|
|
.uninit = uninit,
|
|
|
|
.priv_size = sizeof(OverlayContext),
|
|
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = avfilter_vf_overlay_inputs,
|
|
.outputs = avfilter_vf_overlay_outputs,
|
|
.priv_class = &overlay_class,
|
|
};
|