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vf_overlay: switch to an AVOptions-based system.

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This commit is contained in:
Anton Khirnov 2013-02-25 21:21:29 +01:00
parent 20b46f8f4f
commit 9087eaf193
2 changed files with 36 additions and 22 deletions
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22
doc/filters.texi
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@ -1485,11 +1485,19 @@ Overlay one video on top of another.
It takes two inputs and one output, the first input is the "main"
video on which the second input is overlayed.
It accepts the parameters: @var{x}:@var{y}.
This filter accepts the following parameters:
@var{x} is the x coordinate of the overlayed video on the main video,
@var{y} is the y coordinate. The parameters are expressions containing
the following parameters:
@table @option
@item x
The horizontal position of the left edge of the overlaid video on the main video.
@item y
The vertical position of the top edge of the overlaid video on the main video.
@end table
The parameters are expressions containing the following parameters:
@table @option
@item main_w, main_h
@ -1515,15 +1523,15 @@ Follow some examples:
@example
# draw the overlay at 10 pixels from the bottom right
# corner of the main video.
overlay=main_w-overlay_w-10:main_h-overlay_h-10
overlay=x=main_w-overlay_w-10:y=main_h-overlay_h-10
# insert a transparent PNG logo in the bottom left corner of the input
avconv -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
avconv -i input -i logo -filter_complex 'overlay=x=10:y=main_h-overlay_h-10' output
# insert 2 different transparent PNG logos (second logo on bottom
# right corner):
avconv -i input -i logo1 -i logo2 -filter_complex
'overlay=10:H-h-10,overlay=W-w-10:H-h-10' output
'overlay=x=10:y=H-h-10,overlay=x=W-w-10:y=H-h-10' output
# add a transparent color layer on top of the main video,
# WxH specifies the size of the main input to the overlay filter

36
libavfilter/vf_overlay.c
View File

@ -34,6 +34,7 @@
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "video.h"
@ -63,30 +64,18 @@ enum var_name {
#define OVERLAY 1
typedef struct {
const AVClass *class;
int x, y; ///< position of overlayed picture
int max_plane_step[4]; ///< steps per pixel for each plane
int hsub, vsub; ///< chroma subsampling values
char x_expr[256], y_expr[256];
char *x_expr, *y_expr;
AVFrame *main;
AVFrame *over_prev, *over_next;
} OverlayContext;
static av_cold int init(AVFilterContext *ctx, const char *args)
{
OverlayContext *over = ctx->priv;
av_strlcpy(over->x_expr, "0", sizeof(over->x_expr));
av_strlcpy(over->y_expr, "0", sizeof(over->y_expr));
if (args)
sscanf(args, "%255[^:]:%255[^:]", over->x_expr, over->y_expr);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
@ -358,6 +347,23 @@ static int request_frame(AVFilterLink *outlink)
return output_frame(ctx);
}
#define OFFSET(x) offsetof(OverlayContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "x", "Horizontal position of the left edge of the overlaid video on the "
"main video.", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "y", "Vertical position of the top edge of the overlaid video on the "
"main video.", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ NULL },
};
static const AVClass overlay_class = {
.class_name = "overlay",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
{
.name = "main",
@ -391,10 +397,10 @@ 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),
.priv_class = &overlay_class,
.query_formats = query_formats,