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avcodec/bsf: Add custom item name function for bsf list 

which will
construct string description of filter chain. This is
done using lazy-initialization, so there is no overhead
if item name is never accessed.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Jan Sebechlebsky 2016-08-21 10:36:12 +02:00 committed by Michael Niedermayer
parent 4d7d74802d
commit 57503fab4f
1 changed files with 28 additions and 1 deletions
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29
libavcodec/bsf.c
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@ -248,6 +248,7 @@ typedef struct BSFListContext {
unsigned idx; // index of currently processed BSF
unsigned flushed_idx; // index of BSF being flushed
char * item_name;
} BSFListContext;
@ -345,11 +346,37 @@ static void bsf_list_close(AVBSFContext *bsf)
for (i = 0; i < lst->nb_bsfs; ++i)
av_bsf_free(&lst->bsfs[i]);
av_freep(&lst->bsfs);
av_freep(&lst->item_name);
}
static const char *bsf_list_item_name(void *ctx)
{
static const char *null_filter_name = "null";
AVBSFContext *bsf_ctx = ctx;
BSFListContext *lst = bsf_ctx->priv_data;
if (!lst->nb_bsfs)
return null_filter_name;
if (!lst->item_name) {
int i;
AVBPrint bp;
av_bprint_init(&bp, 16, 128);
av_bprintf(&bp, "bsf_list(");
for (i = 0; i < lst->nb_bsfs; i++)
av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
av_bprintf(&bp, ")");
av_bprint_finalize(&bp, &lst->item_name);
}
return lst->item_name;
}
static const AVClass bsf_list_class = {
.class_name = "bsf_list",
.item_name = av_default_item_name,
.item_name = bsf_list_item_name,
.version = LIBAVUTIL_VERSION_INT,
};