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avfilter/f_metadata: add starts_with string function 

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
This commit is contained in:
Tobias Rapp 2016-02-11 13:35:20 +01:00 committed by Paul B Mahol
parent 202f978728
commit 6889deba68
2 changed files with 14 additions and 0 deletions
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4
doc/filters.texi
View File

@ -8500,6 +8500,10 @@ Can be one of following:
Values are interpreted as strings, returns true if @code{value} is same as metadata value up
to N chars as set in @code{length} option.
@item starts_with
Values are interpreted as strings, returns true if metadata value starts with
the @code{value} option string.
@item less
Values are interpreted as floats, returns true if metadata value is less than @code{value}.

10
libavfilter/f_metadata.c
View File

@ -49,6 +49,7 @@ enum MetadataMode {
enum MetadataFunction {
METADATAF_STRING,
METADATAF_STARTS_WITH,
METADATAF_LESS,
METADATAF_EQUAL,
METADATAF_GREATER,
@ -102,6 +103,7 @@ static const AVOption filt_name##_options[] = { \
{ "value", "set metadata value", OFFSET(value), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
{ "function", "function for comparing values", OFFSET(function), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATAF_NB-1, FLAGS, "function" }, \
{ "string", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STRING }, 0, 3, FLAGS, "function" }, \
{ "starts_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STARTS_WITH }, 0, 0, FLAGS, "function" }, \
{ "less", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_LESS }, 0, 3, FLAGS, "function" }, \
{ "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" }, \
@ -117,6 +119,11 @@ static int string(MetadataContext *s, const char *value1, const char *value2, si
return !strncmp(value1, value2, length);
}
static int starts_with(MetadataContext *s, const char *value1, const char *value2, size_t length)
{
return !strncmp(value1, value2, strlen(value2));
}
static int equal(MetadataContext *s, const char *value1, const char *value2, size_t length)
{
float f1, f2;
@ -201,6 +208,9 @@ static av_cold int init(AVFilterContext *ctx)
case METADATAF_STRING:
s->compare = string;
break;
case METADATAF_STARTS_WITH:
s->compare = starts_with;
break;
case METADATAF_LESS:
s->compare = less;
break;