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vf_fade: switch to an AVOptions-based system.
This commit is contained in:
Anton Khirnov
parent
8ec464c61c
commit
b9dfee9fa2
@ -1000,33 +1000,37 @@ For more information about libfreetype, check:
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Apply fade-in/out effect to input video.
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It accepts the parameters:
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@var{type}:@var{start_frame}:@var{nb_frames}
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This filter accepts the following options:
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@var{type} specifies if the effect type, can be either "in" for
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fade-in, or "out" for a fade-out effect.
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@table @option
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@var{start_frame} specifies the number of the start frame for starting
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to apply the fade effect.
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@item type
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The effect type -- can be either "in" for fade-in, or "out" for a fade-out
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effect.
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@var{nb_frames} specifies the number of frames for which the fade
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effect has to last. At the end of the fade-in effect the output video
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will have the same intensity as the input video, at the end of the
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fade-out transition the output video will be completely black.
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@item start_frame
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The number of the start frame for starting to apply the fade effect.
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@item nb_frames
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The number of frames for which the fade effect has to last. At the end of the
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fade-in effect the output video will have the same intensity as the input video,
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at the end of the fade-out transition the output video will be completely black.
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@end table
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A few usage examples follow, usable too as test scenarios.
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@example
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# fade in first 30 frames of video
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fade=in:0:30
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fade=type=in:nb_frames=30
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# fade out last 45 frames of a 200-frame video
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fade=out:155:45
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fade=type=out:start_frame=155:nb_frames=45
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# fade in first 25 frames and fade out last 25 frames of a 1000-frame video
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fade=in:0:25, fade=out:975:25
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fade=type=in:start_frame=0:nb_frames=25, fade=type=out:start_frame=975:nb_frames=25
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# make first 5 frames black, then fade in from frame 5-24
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fade=in:5:20
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fade=type=in:start_frame=5:nb_frames=20
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@end example
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@section fieldorder
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@ -26,48 +26,42 @@
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*/
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.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 FADE_IN 0
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#define FADE_OUT 1
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typedef struct {
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const AVClass *class;
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int type;
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int factor, fade_per_frame;
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unsigned int frame_index, start_frame, stop_frame;
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int start_frame, nb_frames;
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unsigned int frame_index, stop_frame;
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int hsub, vsub, bpp;
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} FadeContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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FadeContext *fade = ctx->priv;
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unsigned int nb_frames;
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char in_out[4];
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if (!args ||
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sscanf(args, " %3[^:]:%u:%u", in_out, &fade->start_frame, &nb_frames) != 3) {
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av_log(ctx, AV_LOG_ERROR,
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"Expected 3 arguments '(in|out):#:#':'%s'\n", args);
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return AVERROR(EINVAL);
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}
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nb_frames = nb_frames ? nb_frames : 1;
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fade->fade_per_frame = (1 << 16) / nb_frames;
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if (!strcmp(in_out, "in"))
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fade->fade_per_frame = (1 << 16) / fade->nb_frames;
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if (fade->type == FADE_IN) {
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fade->factor = 0;
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else if (!strcmp(in_out, "out")) {
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} else if (fade->type == FADE_OUT) {
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fade->fade_per_frame = -fade->fade_per_frame;
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fade->factor = (1 << 16);
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} else {
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av_log(ctx, AV_LOG_ERROR,
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"first argument must be 'in' or 'out':'%s'\n", in_out);
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return AVERROR(EINVAL);
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}
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fade->stop_frame = fade->start_frame + nb_frames;
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fade->stop_frame = fade->start_frame + fade->nb_frames;
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av_log(ctx, AV_LOG_VERBOSE,
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"type:%s start_frame:%d nb_frames:%d\n",
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in_out, fade->start_frame, nb_frames);
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fade->type == FADE_IN ? "in" : "out", fade->start_frame,
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fade->nb_frames);
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return 0;
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}
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@ -143,6 +137,26 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(FadeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
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{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
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{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
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{ "start_frame", "Number of the first frame to which to apply the effect.",
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OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "nb_frames", "Number of frames to which the effect should be applied.",
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OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, FLAGS },
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{ NULL },
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};
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static const AVClass fade_class = {
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.class_name = "fade",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_fade_inputs[] = {
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{
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.name = "default",
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@ -168,6 +182,7 @@ AVFilter avfilter_vf_fade = {
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.description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
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.init = init,
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.priv_size = sizeof(FadeContext),
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.priv_class = &fade_class,
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.query_formats = query_formats,
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.inputs = avfilter_vf_fade_inputs,
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