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lavfi/fade: accept shorthand syntax

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This commit is contained in:
Stefano Sabatini 2013-01-18 18:56:29 +01:00
parent 44d5a28b7d
commit 2852bd704a
3 changed files with 21 additions and 58 deletions
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32
doc/filters.texi
View file

@ -2276,33 +2276,27 @@ edgedetect=low=0.1:high=0.4
Apply fade-in/out effect to input video.
It accepts the parameters:
@var{type}:@var{start_frame}:@var{nb_frames}[:@var{options}]
The filter accepts parameters as a list of @var{key}=@var{value}
pairs, separated by ":". If the key of the first options is omitted,
the arguments are interpreted according to the syntax
@var{type}:@var{start_frame}:@var{nb_frames}.
@var{type} specifies if the effect type, can be either "in" for
fade-in, or "out" for a fade-out effect.
@var{start_frame} specifies the number of the start frame for starting
to apply the fade effect.
@var{nb_frames} specifies the number of frames for which the fade
effect has to last. At the end of the fade-in effect the output video
will have the same intensity as the input video, at the end of the
fade-out transition the output video will be completely black.
@var{options} is an optional sequence of @var{key}=@var{value} pairs,
separated by ":". The description of the accepted options follows.
A description of the accepted parameters follows.
@table @option
@item type, t
See @var{type}.
Specify if the effect type, can be either @code{in} for fade-in, or
@code{out} for a fade-out effect. Default is @code{in}.
@item start_frame, s
See @var{start_frame}.
Specify the number of the start frame for starting to apply the fade
effect. Default is 0.
@item nb_frames, n
See @var{nb_frames}.
Specify the number of frames for which the fade effect has to last. At
the end of the fade-in effect the output video will have the same
intensity as the input video, at the end of the fade-out transition
the output video will be completely black. Default is 25.
@item alpha
If set to 1, fade only alpha channel, if one exists on the input.

2
libavfilter/version.h
View file

@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 32
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

45
libavfilter/vf_fade.c
View file

@ -78,41 +78,14 @@ AVFILTER_DEFINE_CLASS(fade);
static av_cold int init(AVFilterContext *ctx, const char *args)
{
FadeContext *fade = ctx->priv;
int ret = 0;
char *args1, *expr, *bufptr = NULL;
static const char *shorthand[] = { "type", "start_frame", "nb_frames", NULL };
int ret;
fade->class = &fade_class;
av_opt_set_defaults(fade);
if (!(args1 = av_strdup(args))) {
ret = AVERROR(ENOMEM);
goto end;
}
if (expr = av_strtok(args1, ":", &bufptr)) {
av_free(fade->type);
if (!(fade->type = av_strdup(expr))) {
ret = AVERROR(ENOMEM);
goto end;
}
}
if (expr = av_strtok(NULL, ":", &bufptr)) {
if ((ret = av_opt_set(fade, "start_frame", expr, 0)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value '%s' for start_frame option\n", expr);
goto end;
}
}
if (expr = av_strtok(NULL, ":", &bufptr)) {
if ((ret = av_opt_set(fade, "nb_frames", expr, 0)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value '%s' for nb_frames option\n", expr);
goto end;
}
}
if (bufptr && (ret = av_set_options_string(fade, bufptr, "=", ":")) < 0)
goto end;
if ((ret = av_opt_set_from_string(fade, args, shorthand, "=", ":")) < 0)
return ret;
fade->fade_per_frame = (1 << 16) / fade->nb_frames;
if (!strcmp(fade->type, "in"))
@ -123,25 +96,21 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
} else {
av_log(ctx, AV_LOG_ERROR,
"Type argument must be 'in' or 'out' but '%s' was specified\n", fade->type);
ret = AVERROR(EINVAL);
goto end;
return AVERROR(EINVAL);
}
fade->stop_frame = fade->start_frame + fade->nb_frames;
av_log(ctx, AV_LOG_VERBOSE,
"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
fade->type, fade->start_frame, fade->nb_frames, fade->alpha);
end:
av_free(args1);
return ret;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
FadeContext *fade = ctx->priv;
av_freep(&fade->type);
av_opt_free(fade);
}
static int query_formats(AVFilterContext *ctx)