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Code Issues Releases Activity

AVOptions: add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find().

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It allows to search for options only with AVClass, without allocating
the corresponding context.
This commit is contained in:
Anton Khirnov
2011-08-23 07:11:26 +02:00
parent 5938e02185
commit c11fb8288d
5 changed files with 15 additions and 3 deletions
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3
doc/APIchanges
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@@ -13,6 +13,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2011-08-xx - xxxxxxx - lavu 51.10.0
Add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find() function.
2011-08-xx - xxxxxx - lavu 51.9.0
Add av_fifo_peek2(), deprecate av_fifo_peek().

2
libavcodec/options.c
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@@ -44,7 +44,7 @@ static const AVOption *opt_find(void *obj, const char *name, const char *unit, i
AVCodecContext *s = obj;
AVCodec *c = NULL;
if (s->priv_data) {
if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ) && s->priv_data) {
if (s->codec->priv_class)
return av_opt_find(s->priv_data, name, unit, opt_flags, search_flags);
return NULL;

2
libavformat/options.c
View File

@@ -38,7 +38,7 @@ static const AVOption *opt_find(void *obj, const char *name, const char *unit, i
AVFormatContext *s = obj;
AVInputFormat *ifmt = NULL;
AVOutputFormat *ofmt = NULL;
if (s->priv_data) {
if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ) && s->priv_data) {
if ((s->iformat && !s->iformat->priv_class) ||
(s->oformat && !s->oformat->priv_class))
return NULL;

2
libavutil/avutil.h
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@@ -40,7 +40,7 @@
#define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
#define LIBAVUTIL_VERSION_MAJOR 51
#define LIBAVUTIL_VERSION_MINOR 9
#define LIBAVUTIL_VERSION_MINOR 10
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

9
libavutil/opt.h
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@@ -215,6 +215,13 @@ int av_opt_set_dict(void *obj, struct AVDictionary **options);
#define AV_OPT_SEARCH_CHILDREN 0x0001 /**< Search in possible children of the
given object first. */
/**
* The obj passed to av_opt_find() is fake -- only a double pointer to AVClass
* instead of a required pointer to a struct containing AVClass. This is
* useful for searching for options without needing to allocate the corresponding
* object.
*/
#define AV_OPT_SEARCH_FAKE_OBJ 0x0002
/**
* Look for an option in an object. Consider only options which
@@ -222,6 +229,8 @@ int av_opt_set_dict(void *obj, struct AVDictionary **options);
*
* @param[in] obj A pointer to a struct whose first element is a
* pointer to an AVClass.
* Alternatively a double pointer to an AVClass, if
* AV_OPT_SEARCH_FAKE_OBJ search flag is set.
* @param[in] name The name of the option to look for.
* @param[in] unit When searching for named constants, name of the unit
* it belongs to.