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AVOptions: add new API for enumerating children.

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This will allow the caller to enumerate child contexts in a generic way
and since the API is recursive, it also allows for deeper nesting (e.g.
AVFormatContext->AVIOContext->URLContext)

This will also allow the new setting/reading API to transparently apply
to children contexts.
This commit is contained in:
Anton Khirnov
2011-10-03 19:49:12 +02:00
parent 1bca8f4bc5
commit 641c7afe3c
5 changed files with 141 additions and 41 deletions
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32
libavcodec/options.c
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@@ -39,22 +39,27 @@ static const char* context_to_name(void* ptr) {
return "NULL";
}
static const AVOption *opt_find(void *obj, const char *name, const char *unit, int opt_flags, int search_flags)
static void *codec_child_next(void *obj, void *prev)
{
AVCodecContext *s = obj;
AVCodec *c = NULL;
if (!prev && s->codec && s->codec->priv_class && s->priv_data)
return s->priv_data;
return NULL;
}
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;
}
static const AVClass *codec_child_class_next(const AVClass *prev)
{
AVCodec *c = NULL;
while ((c = av_codec_next(c))) {
const AVOption *o;
if (c->priv_class && (o = av_opt_find(&c->priv_class, name, unit, opt_flags, search_flags)))
return o;
}
/* find the codec that corresponds to prev */
while (prev && (c = av_codec_next(c)))
if (c->priv_class == prev)
break;
/* find next codec with priv options */
while (c = av_codec_next(c))
if (c->priv_class)
return c->priv_class;
return NULL;
}
@@ -522,7 +527,8 @@ static const AVClass av_codec_context_class = {
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.log_level_offset_offset = OFFSET(log_level_offset),
.opt_find = opt_find,
.child_next = codec_child_next,
.child_class_next = codec_child_class_next,
};
void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType codec_type){