670 lines
24 KiB
C
670 lines
24 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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enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format;
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AVFrame *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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int shortest; ///< terminate stream when the shortest input terminates
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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 (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
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{ "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
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{ "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
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{ "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
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{ "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
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{ "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
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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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if (over->allow_packed_rgb) {
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av_log(ctx, AV_LOG_WARNING,
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"The rgb option is deprecated and is overriding the format option, use format instead\n");
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over->format = OVERLAY_FORMAT_RGB;
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}
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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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av_frame_free(&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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static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
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AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
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};
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static 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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static 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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switch (over->format) {
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case OVERLAY_FORMAT_YUV420:
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main_formats = ff_make_format_list(main_pix_fmts_yuv420);
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overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);
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break;
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case OVERLAY_FORMAT_YUV444:
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main_formats = ff_make_format_list(main_pix_fmts_yuv444);
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overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);
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break;
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case OVERLAY_FORMAT_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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break;
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default:
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av_assert0(0);
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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_YUVA444P,
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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_WARNING,
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"Overlay area with coordinates x1:%d y1:%d x2:%d y2:%d "
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"is not completely contained within the output with size %dx%d\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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}
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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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// 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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// calculate the unpremultiplied alpha, applying the general equation:
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// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
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// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
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// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
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#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
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/**
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* Blend image in src to destination buffer dst at position (x, y).
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*/
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static void blend_image(AVFilterContext *ctx,
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AVFrame *dst, AVFrame *src,
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int x, int y)
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{
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OverlayContext *over = ctx->priv;
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int i, imax, j, jmax, k, kmax;
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const int src_w = src->width;
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const int src_h = src->height;
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const int dst_w = dst->width;
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const int dst_h = dst->height;
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if (x >= dst_w || x+dst_w < 0 ||
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y >= dst_h || y+dst_h < 0)
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return; /* no intersection */
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if (over->main_is_packed_rgb) {
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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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uint8_t *s, *sp, *d, *dp;
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i = FFMAX(-y, 0);
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sp = src->data[0] + i * src->linesize[0];
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dp = dst->data[0] + (y+i) * dst->linesize[0];
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for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
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j = FFMAX(-x, 0);
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s = sp + j * sstep;
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d = dp + (x+j) * dstep;
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for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; 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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uint8_t alpha_d = d[da];
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alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
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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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const int main_has_alpha = over->main_has_alpha;
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if (main_has_alpha) {
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uint8_t alpha; ///< the amount of overlay to blend on to main
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uint8_t *s, *sa, *d, *da;
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i = FFMAX(-y, 0);
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sa = src->data[3] + i * src->linesize[3];
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da = dst->data[3] + (y+i) * dst->linesize[3];
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for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
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j = FFMAX(-x, 0);
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s = sa + j;
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d = da + x+j;
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for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
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alpha = *s;
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if (alpha != 0 && alpha != 255) {
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uint8_t alpha_d = *d;
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alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
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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 = *s;
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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 += FAST_DIV255((255 - *d) * *s);
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}
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d += 1;
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s += 1;
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}
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da += dst->linesize[3];
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sa += src->linesize[3];
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}
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}
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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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int src_wp = FFALIGN(src_w, 1<<hsub) >> hsub;
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int src_hp = FFALIGN(src_h, 1<<vsub) >> vsub;
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int dst_wp = FFALIGN(dst_w, 1<<hsub) >> hsub;
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int dst_hp = FFALIGN(dst_h, 1<<vsub) >> vsub;
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int yp = y>>vsub;
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int xp = x>>hsub;
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uint8_t *s, *sp, *d, *dp, *a, *ap;
|
|
|
|
j = FFMAX(-yp, 0);
|
|
sp = src->data[i] + j * src->linesize[i];
|
|
dp = dst->data[i] + (yp+j) * dst->linesize[i];
|
|
ap = src->data[3] + (j<<vsub) * src->linesize[3];
|
|
|
|
for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
|
|
k = FFMAX(-xp, 0);
|
|
d = dp + xp+k;
|
|
s = sp + k;
|
|
a = ap + (k<<hsub);
|
|
|
|
for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
|
|
int alpha_v, alpha_h, alpha;
|
|
|
|
// average alpha for color components, improve quality
|
|
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
|
|
alpha = (a[0] + a[src->linesize[3]] +
|
|
a[1] + a[src->linesize[3]+1]) >> 2;
|
|
} else if (hsub || vsub) {
|
|
alpha_h = hsub && k+1 < src_wp ?
|
|
(a[0] + a[1]) >> 1 : a[0];
|
|
alpha_v = vsub && j+1 < src_hp ?
|
|
(a[0] + a[src->linesize[3]]) >> 1 : a[0];
|
|
alpha = (alpha_v + alpha_h) >> 1;
|
|
} else
|
|
alpha = a[0];
|
|
// if the main channel has an alpha channel, alpha has to be calculated
|
|
// to create an un-premultiplied (straight) alpha value
|
|
if (main_has_alpha && alpha != 0 && alpha != 255) {
|
|
// average alpha for color components, improve quality
|
|
uint8_t alpha_d;
|
|
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
|
|
alpha_d = (d[0] + d[src->linesize[3]] +
|
|
d[1] + d[src->linesize[3]+1]) >> 2;
|
|
} else if (hsub || vsub) {
|
|
alpha_h = hsub && k+1 < src_wp ?
|
|
(d[0] + d[1]) >> 1 : d[0];
|
|
alpha_v = vsub && j+1 < src_hp ?
|
|
(d[0] + d[src->linesize[3]]) >> 1 : d[0];
|
|
alpha_d = (alpha_v + alpha_h) >> 1;
|
|
} else
|
|
alpha_d = d[0];
|
|
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
|
|
}
|
|
*d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
|
|
s++;
|
|
d++;
|
|
a += 1 << hsub;
|
|
}
|
|
dp += dst->linesize[i];
|
|
sp += src->linesize[i];
|
|
ap += (1 << vsub) * src->linesize[3];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int try_filter_frame(AVFilterContext *ctx, AVFrame *mainpic)
|
|
{
|
|
OverlayContext *over = ctx->priv;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFrame *next_overpic;
|
|
int ret;
|
|
|
|
/* Discard obsolete overlay frames: if there is a next overlay frame with pts
|
|
* before the main frame, we can drop the current overlay. */
|
|
while (1) {
|
|
next_overpic = ff_bufqueue_peek(&over->queue_over, 0);
|
|
if (!next_overpic || av_compare_ts(next_overpic->pts, ctx->inputs[OVERLAY]->time_base,
|
|
mainpic->pts , ctx->inputs[MAIN]->time_base) > 0)
|
|
break;
|
|
ff_bufqueue_get(&over->queue_over);
|
|
av_frame_free(&over->overpicref);
|
|
over->overpicref = next_overpic;
|
|
}
|
|
|
|
/* If there is no next frame and no EOF and the overlay frame is before
|
|
* the main frame, we can not know yet if it will be superseded. */
|
|
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. */
|
|
av_dlog(ctx, "main_pts:%s main_pts_time:%s",
|
|
av_ts2str(mainpic->pts), av_ts2timestr(mainpic->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");
|
|
|
|
if (over->overpicref)
|
|
blend_image(ctx, mainpic, over->overpicref, over->x, over->y);
|
|
ret = ff_filter_frame(ctx->outputs[0], mainpic);
|
|
av_assert1(ret != AVERROR(EAGAIN));
|
|
over->frame_requested = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int try_filter_next_frame(AVFilterContext *ctx)
|
|
{
|
|
OverlayContext *over = ctx->priv;
|
|
AVFrame *next_mainpic = ff_bufqueue_peek(&over->queue_main, 0);
|
|
int ret;
|
|
|
|
if (!next_mainpic)
|
|
return AVERROR(EAGAIN);
|
|
if ((ret = try_filter_frame(ctx, next_mainpic)) == AVERROR(EAGAIN))
|
|
return ret;
|
|
ff_bufqueue_get(&over->queue_main);
|
|
return ret;
|
|
}
|
|
|
|
static int flush_frames(AVFilterContext *ctx)
|
|
{
|
|
int ret;
|
|
|
|
while (!(ret = try_filter_next_frame(ctx)));
|
|
return ret == AVERROR(EAGAIN) ? 0 : ret;
|
|
}
|
|
|
|
static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
OverlayContext *over = ctx->priv;
|
|
int ret;
|
|
|
|
if ((ret = flush_frames(ctx)) < 0)
|
|
return ret;
|
|
if ((ret = try_filter_frame(ctx, inpicref)) < 0) {
|
|
if (ret != AVERROR(EAGAIN))
|
|
return ret;
|
|
ff_bufqueue_add(ctx, &over->queue_main, inpicref);
|
|
}
|
|
|
|
if (!over->overpicref)
|
|
return 0;
|
|
flush_frames(ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame_over(AVFilterLink *inlink, AVFrame *inpicref)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
OverlayContext *over = ctx->priv;
|
|
int ret;
|
|
|
|
if ((ret = flush_frames(ctx)) < 0)
|
|
return ret;
|
|
ff_bufqueue_add(ctx, &over->queue_over, inpicref);
|
|
ret = try_filter_next_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_filter_next_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 (over->shortest)
|
|
return ret;
|
|
if ((ret = try_filter_next_frame(ctx)) != AVERROR(EAGAIN))
|
|
return ret;
|
|
ret = 0; /* continue requesting frames on main */
|
|
}
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
|
|
{
|
|
.name = "main",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = ff_null_get_video_buffer,
|
|
.config_props = config_input_main,
|
|
.filter_frame = filter_frame_main,
|
|
.needs_writable = 1,
|
|
},
|
|
{
|
|
.name = "overlay",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input_overlay,
|
|
.filter_frame = filter_frame_over,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_overlay_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const char *const shorthand[] = { "x", "y", 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,
|
|
.shorthand = shorthand,
|
|
};
|