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blend filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
8036ba299d
commit
47619e41c4
@ -22,6 +22,7 @@ version <next>:
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- RF64 support in WAV muxer
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- noise filter ported from libmpcodecs
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- Subtitles character encoding conversion
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- blend filter
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version 1.1:
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108
doc/filters.texi
108
doc/filters.texi
@ -1778,6 +1778,114 @@ threshold, and defaults to 98.
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@var{threshold} is the threshold below which a pixel value is
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considered black, and defaults to 32.
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@section blend
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Blend two video frames into each other.
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It takes two input streams and outputs one stream, the first input is the
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"top" layer and second input is "bottom" layer.
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Output terminates when shortest input terminates.
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This filter accepts a list of options in the form of @var{key}=@var{value}
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pairs separated by ":". A description of the accepted options follows.
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@table @option
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@item c0_mode
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@item c1_mode
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@item c2_mode
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@item c3_mode
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@item all_mode
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Set blend mode for specific pixel component or all pixel components in case
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of @var{all_mode}. Default value is @code{normal}.
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Available values for component modes are:
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@table @samp
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@item addition
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@item and
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@item average
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@item burn
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@item darken
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@item difference
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@item divide
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@item dodge
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@item exclusion
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@item hardlight
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@item lighten
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@item multiply
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@item negation
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@item normal
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@item or
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@item overlay
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@item phoenix
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@item pinlight
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@item reflect
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@item screen
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@item softlight
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@item subtract
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@item vividlight
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@item xor
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@end table
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@item c0_opacity
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@item c1_opacity
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@item c2_opacity
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@item c3_opacity
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@item all_opacity
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Set blend opacity for specific pixel component or all pixel components in case
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of @var{all_expr}. Only used in combination with pixel component blend modes.
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@item c0_expr
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@item c1_expr
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@item c2_expr
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@item c3_expr
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@item all_expr
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Set blend expression for specific pixel component or all pixel components in case
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of @var{all_expr}. Note that related mode options will be ignored if those are set.
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The expressions can use the following variables:
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@table @option
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@item X
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@item Y
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the coordinates of the current sample
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@item W
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@item H
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the width and height of currently filtered plane
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@item SW
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@item SH
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Width and height scale depending on the currently filtered plane. It is the
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ratio between the corresponding luma plane number of pixels and the current
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plane ones. E.g. for YUV4:2:0 the values are @code{1,1} for the luma plane, and
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@code{0.5,0.5} for chroma planes.
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@item T
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Time of the current frame, expressed in seconds.
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@item TOP, A
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Value of pixel component at current location for first video frame (top layer).
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@item BOTTOM, B
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Value of pixel component at current location for second video frame (bottom layer).
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@end table
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@end table
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@itemize
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@item
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Apply transition from bottom layer to top layer in first 10 seconds:
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@example
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blend=all_expr='A*(if(gte(T,10),1,T/10))+B*(1-(if(gte(T,10),1,T/10)))'
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@end example
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@item
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Apply 1x1 checkerboard effect:
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@example
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blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
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@end example
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@end itemize
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@section boxblur
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Apply boxblur algorithm to the input video.
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@ -100,6 +100,7 @@ OBJS-$(CONFIG_ALPHAMERGE_FILTER) += vf_alphamerge.o
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OBJS-$(CONFIG_BBOX_FILTER) += bbox.o vf_bbox.o
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OBJS-$(CONFIG_BLACKDETECT_FILTER) += vf_blackdetect.o
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OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
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OBJS-$(CONFIG_BLEND_FILTER) += vf_blend.o
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OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
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OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
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OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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@ -94,6 +94,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(BBOX, bbox, vf);
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REGISTER_FILTER(BLACKDETECT, blackdetect, vf);
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REGISTER_FILTER(BLACKFRAME, blackframe, vf);
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REGISTER_FILTER(BLEND, blend, vf);
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REGISTER_FILTER(BOXBLUR, boxblur, vf);
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REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
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REGISTER_FILTER(COPY, copy, vf);
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@ -29,8 +29,8 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 38
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#define LIBAVFILTER_VERSION_MICRO 106
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#define LIBAVFILTER_VERSION_MINOR 39
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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474
libavfilter/vf_blend.c
Normal file
474
libavfilter/vf_blend.c
Normal file
@ -0,0 +1,474 @@
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/*
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* Copyright (c) 2013 Paul B Mahol
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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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#include "libavutil/imgutils.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixfmt.h"
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#include "avfilter.h"
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#include "bufferqueue.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define TOP 0
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#define BOTTOM 1
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enum BlendMode {
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BLEND_UNSET = -1,
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BLEND_NORMAL,
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BLEND_ADDITION,
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BLEND_AND,
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BLEND_AVERAGE,
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BLEND_BURN,
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BLEND_DARKEN,
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BLEND_DIFFERENCE,
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BLEND_DIVIDE,
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BLEND_DODGE,
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BLEND_EXCLUSION,
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BLEND_HARDLIGHT,
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BLEND_LIGHTEN,
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BLEND_MULTIPLY,
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BLEND_NEGATION,
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BLEND_OR,
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BLEND_OVERLAY,
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BLEND_PHOENIX,
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BLEND_PINLIGHT,
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BLEND_REFLECT,
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BLEND_SCREEN,
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BLEND_SOFTLIGHT,
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BLEND_SUBTRACT,
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BLEND_VIVIDLIGHT,
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BLEND_XOR,
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BLEND_NB
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};
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static const char *const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "A", "B", "TOP", "BOTTOM", NULL };
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enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB };
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typedef struct FilterParams {
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enum BlendMode mode;
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double values[VAR_VARS_NB];
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double opacity;
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AVExpr *e;
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char *expr_str;
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void (*blend)(const uint8_t *top, int top_linesize,
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const uint8_t *bottom, int bottom_linesize,
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uint8_t *dst, int dst_linesize,
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int width, int height, struct FilterParams *param);
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} FilterParams;
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typedef struct {
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const AVClass *class;
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struct FFBufQueue queue_top;
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struct FFBufQueue queue_bottom;
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int hsub, vsub; ///< chroma subsampling values
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int frame_requested;
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char *all_expr;
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enum BlendMode all_mode;
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double all_opacity;
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FilterParams params[4];
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} BlendContext;
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#define OFFSET(x) offsetof(BlendContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption blend_options[] = {
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{ "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},
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{ "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},
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{ "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},
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{ "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},
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{ "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},
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{ "addition", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION}, 0, 0, FLAGS, "mode" },
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{ "and", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND}, 0, 0, FLAGS, "mode" },
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{ "average", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE}, 0, 0, FLAGS, "mode" },
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{ "burn", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN}, 0, 0, FLAGS, "mode" },
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{ "darken", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN}, 0, 0, FLAGS, "mode" },
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{ "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },
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{ "divide", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE}, 0, 0, FLAGS, "mode" },
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{ "dodge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE}, 0, 0, FLAGS, "mode" },
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{ "exclusion", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION}, 0, 0, FLAGS, "mode" },
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{ "hardlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT}, 0, 0, FLAGS, "mode" },
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{ "lighten", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN}, 0, 0, FLAGS, "mode" },
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{ "multiply", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY}, 0, 0, FLAGS, "mode" },
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{ "negation", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION}, 0, 0, FLAGS, "mode" },
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{ "normal", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL}, 0, 0, FLAGS, "mode" },
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{ "or", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR}, 0, 0, FLAGS, "mode" },
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{ "overlay", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY}, 0, 0, FLAGS, "mode" },
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{ "phoenix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX}, 0, 0, FLAGS, "mode" },
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{ "pinlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT}, 0, 0, FLAGS, "mode" },
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{ "reflect", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT}, 0, 0, FLAGS, "mode" },
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{ "screen", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN}, 0, 0, FLAGS, "mode" },
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{ "softlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT}, 0, 0, FLAGS, "mode" },
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{ "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" },
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{ "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },
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{ "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" },
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{ "c0_expr", "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c1_expr", "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c2_expr", "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c3_expr", "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "c0_opacity", "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
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{ "c1_opacity", "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
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{ "c2_opacity", "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
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{ "c3_opacity", "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
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{ "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS},
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(blend);
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static void blend_normal(const uint8_t *top, int top_linesize,
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const uint8_t *bottom, int bottom_linesize,
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uint8_t *dst, int dst_linesize,
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int width, int height, FilterParams *param)
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{
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av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, height);
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}
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#define DEFINE_BLEND(name, expr) \
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static void blend_## name(const uint8_t *top, int top_linesize, \
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const uint8_t *bottom, int bottom_linesize, \
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uint8_t *dst, int dst_linesize, \
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int width, int height, FilterParams *param) \
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{ \
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double opacity = param->opacity; \
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int i, j; \
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\
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for (i = 0; i < height; i++) { \
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for (j = 0; j < width; j++) { \
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dst[j] = top[j] + ((expr) - top[j]) * opacity; \
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} \
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dst += dst_linesize; \
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top += top_linesize; \
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bottom += bottom_linesize; \
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} \
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}
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#define A top[j]
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#define B bottom[j]
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#define MULTIPLY(x, a, b) (x * ((a * b) / 255))
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#define SCREEN(x, a, b) (255 - x * ((255 - a) * (255 - b) / 255))
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#define BURN(a, b) ((a == 0) ? a : FFMAX(0, 255 - ((255 - b) << 8) / a))
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#define DODGE(a, b) ((a == 255) ? a : FFMIN(255, ((b << 8) / (255 - a))))
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DEFINE_BLEND(addition, FFMIN(255, A + B))
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DEFINE_BLEND(average, (A + B) / 2)
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DEFINE_BLEND(subtract, FFMAX(0, A - B))
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DEFINE_BLEND(multiply, MULTIPLY(1, A, B))
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DEFINE_BLEND(negation, 255 - FFABS(255 - A - B))
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DEFINE_BLEND(difference, FFABS(A - B))
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DEFINE_BLEND(screen, SCREEN(1, A, B))
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DEFINE_BLEND(overlay, (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
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DEFINE_BLEND(hardlight, (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
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DEFINE_BLEND(darken, FFMIN(A, B))
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DEFINE_BLEND(lighten, FFMAX(A, B))
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DEFINE_BLEND(divide, ((float)A / ((float)B) * 255))
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DEFINE_BLEND(dodge, DODGE(A, B))
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DEFINE_BLEND(burn, BURN(A, B))
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DEFINE_BLEND(softlight, (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - FFABS(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - FFABS(B - 127.5)/255))
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DEFINE_BLEND(exclusion, A + B - 2 * A * B / 255)
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DEFINE_BLEND(pinlight, (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))
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DEFINE_BLEND(phoenix, FFMIN(A, B) - FFMAX(A, B) + 255)
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DEFINE_BLEND(reflect, (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))
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DEFINE_BLEND(and, A & B)
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DEFINE_BLEND(or, A | B)
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DEFINE_BLEND(xor, A ^ B)
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DEFINE_BLEND(vividlight, (B < 128) ? BURN(A, 2 * B) : DODGE(A, 2 * (B - 128)))
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static void blend_expr(const uint8_t *top, int top_linesize,
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const uint8_t *bottom, int bottom_linesize,
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uint8_t *dst, int dst_linesize,
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int width, int height,
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FilterParams *param)
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{
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AVExpr *e = param->e;
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double *values = param->values;
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int y, x;
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for (y = 0; y < height; y++) {
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values[VAR_Y] = y;
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for (x = 0; x < width; x++) {
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values[VAR_X] = x;
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values[VAR_TOP] = values[VAR_A] = top[x];
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values[VAR_BOTTOM] = values[VAR_B] = bottom[x];
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dst[x] = av_expr_eval(e, values, NULL);
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}
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||||
dst += dst_linesize;
|
||||
top += top_linesize;
|
||||
bottom += bottom_linesize;
|
||||
}
|
||||
}
|
||||
|
||||
static av_cold int init(AVFilterContext *ctx, const char *args)
|
||||
{
|
||||
BlendContext *b = ctx->priv;
|
||||
int ret, plane;
|
||||
|
||||
b->class = &blend_class;
|
||||
av_opt_set_defaults(b);
|
||||
|
||||
if ((ret = av_set_options_string(b, args, "=", ":")) < 0)
|
||||
return ret;
|
||||
|
||||
for (plane = 0; plane < FF_ARRAY_ELEMS(b->params); plane++) {
|
||||
FilterParams *param = &b->params[plane];
|
||||
|
||||
if (b->all_mode >= 0)
|
||||
param->mode = b->all_mode;
|
||||
if (b->all_opacity < 1)
|
||||
param->opacity = b->all_opacity;
|
||||
|
||||
switch (param->mode) {
|
||||
case BLEND_ADDITION: param->blend = blend_addition; break;
|
||||
case BLEND_AND: param->blend = blend_and; break;
|
||||
case BLEND_AVERAGE: param->blend = blend_average; break;
|
||||
case BLEND_BURN: param->blend = blend_burn; break;
|
||||
case BLEND_DARKEN: param->blend = blend_darken; break;
|
||||
case BLEND_DIFFERENCE: param->blend = blend_difference; break;
|
||||
case BLEND_DIVIDE: param->blend = blend_divide; break;
|
||||
case BLEND_DODGE: param->blend = blend_dodge; break;
|
||||
case BLEND_EXCLUSION: param->blend = blend_exclusion; break;
|
||||
case BLEND_HARDLIGHT: param->blend = blend_hardlight; break;
|
||||
case BLEND_LIGHTEN: param->blend = blend_lighten; break;
|
||||
case BLEND_MULTIPLY: param->blend = blend_multiply; break;
|
||||
case BLEND_NEGATION: param->blend = blend_negation; break;
|
||||
case BLEND_NORMAL: param->blend = blend_normal; break;
|
||||
case BLEND_OR: param->blend = blend_or; break;
|
||||
case BLEND_OVERLAY: param->blend = blend_overlay; break;
|
||||
case BLEND_PHOENIX: param->blend = blend_phoenix; break;
|
||||
case BLEND_PINLIGHT: param->blend = blend_pinlight; break;
|
||||
case BLEND_REFLECT: param->blend = blend_reflect; break;
|
||||
case BLEND_SCREEN: param->blend = blend_screen; break;
|
||||
case BLEND_SOFTLIGHT: param->blend = blend_softlight; break;
|
||||
case BLEND_SUBTRACT: param->blend = blend_subtract; break;
|
||||
case BLEND_VIVIDLIGHT: param->blend = blend_vividlight; break;
|
||||
case BLEND_XOR: param->blend = blend_xor; break;
|
||||
}
|
||||
|
||||
if (b->all_expr && !param->expr_str) {
|
||||
param->expr_str = av_strdup(b->all_expr);
|
||||
if (!param->expr_str)
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
if (param->expr_str) {
|
||||
ret = av_expr_parse(¶m->e, param->expr_str, var_names,
|
||||
NULL, NULL, NULL, NULL, 0, ctx);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
param->blend = blend_expr;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int query_formats(AVFilterContext *ctx)
|
||||
{
|
||||
static const enum AVPixelFormat pix_fmts[] = {
|
||||
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
|
||||
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
|
||||
AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
|
||||
};
|
||||
|
||||
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int config_output(AVFilterLink *outlink)
|
||||
{
|
||||
AVFilterContext *ctx = outlink->src;
|
||||
AVFilterLink *toplink = ctx->inputs[TOP];
|
||||
AVFilterLink *bottomlink = ctx->inputs[BOTTOM];
|
||||
|
||||
if (toplink->format != bottomlink->format) {
|
||||
av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
if (toplink->w != bottomlink->w ||
|
||||
toplink->h != bottomlink->h ||
|
||||
toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num ||
|
||||
toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) {
|
||||
av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
|
||||
"(size %dx%d, SAR %d:%d) do not match the corresponding "
|
||||
"second input link %s parameters (%dx%d, SAR %d:%d)\n",
|
||||
ctx->input_pads[TOP].name, toplink->w, toplink->h,
|
||||
toplink->sample_aspect_ratio.num,
|
||||
toplink->sample_aspect_ratio.den,
|
||||
ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h,
|
||||
bottomlink->sample_aspect_ratio.num,
|
||||
bottomlink->sample_aspect_ratio.den);
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
outlink->w = toplink->w;
|
||||
outlink->h = bottomlink->h;
|
||||
outlink->time_base = toplink->time_base;
|
||||
outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;
|
||||
outlink->frame_rate = toplink->frame_rate;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int config_input_top(AVFilterLink *inlink)
|
||||
{
|
||||
BlendContext *b = inlink->dst->priv;
|
||||
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
|
||||
|
||||
b->hsub = pix_desc->log2_chroma_w;
|
||||
b->vsub = pix_desc->log2_chroma_h;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static av_cold void uninit(AVFilterContext *ctx)
|
||||
{
|
||||
BlendContext *b = ctx->priv;
|
||||
int i;
|
||||
|
||||
av_opt_free(b);
|
||||
ff_bufqueue_discard_all(&b->queue_top);
|
||||
ff_bufqueue_discard_all(&b->queue_bottom);
|
||||
|
||||
for (i = 0; i < FF_ARRAY_ELEMS(b->params); i++)
|
||||
av_expr_free(b->params[i].e);
|
||||
}
|
||||
|
||||
static int request_frame(AVFilterLink *outlink)
|
||||
{
|
||||
AVFilterContext *ctx = outlink->src;
|
||||
BlendContext *b = ctx->priv;
|
||||
int in, ret;
|
||||
|
||||
b->frame_requested = 1;
|
||||
while (b->frame_requested) {
|
||||
in = ff_bufqueue_peek(&b->queue_top, TOP) ? BOTTOM : TOP;
|
||||
ret = ff_request_frame(ctx->inputs[in]);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void blend_frame(AVFilterContext *ctx,
|
||||
AVFilterBufferRef *top_buf,
|
||||
AVFilterBufferRef *bottom_buf,
|
||||
AVFilterBufferRef *dst_buf)
|
||||
{
|
||||
BlendContext *b = ctx->priv;
|
||||
AVFilterLink *inlink = ctx->inputs[0];
|
||||
FilterParams *param;
|
||||
int plane;
|
||||
|
||||
for (plane = 0; dst_buf->data[plane]; plane++) {
|
||||
int hsub = plane == 1 || plane == 2 ? b->hsub : 0;
|
||||
int vsub = plane == 1 || plane == 2 ? b->vsub : 0;
|
||||
int outw = dst_buf->video->w >> hsub;
|
||||
int outh = dst_buf->video->h >> vsub;
|
||||
uint8_t *dst = dst_buf->data[plane];
|
||||
uint8_t *top = top_buf->data[plane];
|
||||
uint8_t *bottom = bottom_buf->data[plane];
|
||||
|
||||
param = &b->params[plane];
|
||||
param->values[VAR_T] = dst_buf->pts == AV_NOPTS_VALUE ? NAN : dst_buf->pts * av_q2d(inlink->time_base);
|
||||
param->values[VAR_W] = outw;
|
||||
param->values[VAR_H] = outh;
|
||||
param->values[VAR_SW] = outw / dst_buf->video->w;
|
||||
param->values[VAR_SH] = outh / dst_buf->video->h;
|
||||
param->blend(top, top_buf->linesize[plane],
|
||||
bottom, bottom_buf->linesize[plane],
|
||||
dst, dst_buf->linesize[plane], outw, outh, param);
|
||||
}
|
||||
}
|
||||
|
||||
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
|
||||
{
|
||||
AVFilterContext *ctx = inlink->dst;
|
||||
AVFilterLink *outlink = ctx->outputs[0];
|
||||
BlendContext *b = ctx->priv;
|
||||
|
||||
int ret = 0;
|
||||
int is_bottom = (inlink == ctx->inputs[BOTTOM]);
|
||||
struct FFBufQueue *queue =
|
||||
(is_bottom ? &b->queue_bottom : &b->queue_top);
|
||||
ff_bufqueue_add(ctx, queue, buf);
|
||||
|
||||
while (1) {
|
||||
AVFilterBufferRef *top_buf, *bottom_buf, *out_buf;
|
||||
|
||||
if (!ff_bufqueue_peek(&b->queue_top, TOP) ||
|
||||
!ff_bufqueue_peek(&b->queue_bottom, BOTTOM)) break;
|
||||
|
||||
top_buf = ff_bufqueue_get(&b->queue_top);
|
||||
bottom_buf = ff_bufqueue_get(&b->queue_bottom);
|
||||
|
||||
out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
|
||||
outlink->w, outlink->h);
|
||||
if (!out_buf) {
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
avfilter_copy_buffer_ref_props(out_buf, top_buf);
|
||||
|
||||
b->frame_requested = 0;
|
||||
blend_frame(ctx, top_buf, bottom_buf, out_buf);
|
||||
ret = ff_filter_frame(ctx->outputs[0], out_buf);
|
||||
avfilter_unref_buffer(top_buf);
|
||||
avfilter_unref_buffer(bottom_buf);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const AVFilterPad blend_inputs[] = {
|
||||
{
|
||||
.name = "top",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.config_props = config_input_top,
|
||||
.filter_frame = filter_frame,
|
||||
.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
|
||||
},{
|
||||
.name = "bottom",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = filter_frame,
|
||||
.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVFilterPad blend_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.config_props = config_output,
|
||||
.request_frame = request_frame,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFilter avfilter_vf_blend = {
|
||||
.name = "blend",
|
||||
.description = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.priv_size = sizeof(BlendContext),
|
||||
.query_formats = query_formats,
|
||||
.inputs = blend_inputs,
|
||||
.outputs = blend_outputs,
|
||||
.priv_class = &blend_class,
|
||||
};
|
||||
Loading…
x
Reference in New Issue
Block a user