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avfilter/f_metadata: add ends_with() function for comparing ends of strings

This commit is contained in:
Paul B Mahol 2019-09-30 12:13:46 +02:00
parent 6ca3d34ff8
commit 9c9d5bf257
2 changed files with 17 additions and 0 deletions
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4
doc/filters.texi
View File

@ -21856,6 +21856,10 @@ Values are interpreted as floats, returns true if metadata value is greater than
@item expr
Values are interpreted as floats, returns true if expression from option @code{expr}
evaluates to true.
@item ends_with
Values are interpreted as strings, returns true if metadata value ends with
the @code{value} option string.
@end table
@item expr

13
libavfilter/f_metadata.c
View File

@ -54,6 +54,7 @@ enum MetadataFunction {
METADATAF_EQUAL,
METADATAF_GREATER,
METADATAF_EXPR,
METADATAF_ENDS_WITH,
METADATAF_NB
};
@ -107,6 +108,7 @@ static const AVOption filt_name##_options[] = { \
{ "equal", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EQUAL }, 0, 3, FLAGS, "function" }, \
{ "greater", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_GREATER }, 0, 3, FLAGS, "function" }, \
{ "expr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR }, 0, 3, FLAGS, "function" }, \
{ "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH }, 0, 0, FLAGS, "function" }, \
{ "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
{ "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
{ NULL } \
@ -122,6 +124,14 @@ static int starts_with(MetadataContext *s, const char *value1, const char *value
return !strncmp(value1, value2, strlen(value2));
}
static int ends_with(MetadataContext *s, const char *value1, const char *value2)
{
const int len1 = strlen(value1);
const int len2 = strlen(value2);
return !strncmp(value1 + FFMAX(len1 - len2, 0), value2, len2);
}
static int equal(MetadataContext *s, const char *value1, const char *value2)
{
float f1, f2;
@ -212,6 +222,9 @@ static av_cold int init(AVFilterContext *ctx)
case METADATAF_STARTS_WITH:
s->compare = starts_with;
break;
case METADATAF_ENDS_WITH:
s->compare = ends_with;
break;
case METADATAF_LESS:
s->compare = less;
break;