[#OSSL_DECODER_CTX_add_extra]
= OSSL_DECODER_CTX_add_extra
:mrdocs:

Add decoder implementations that feed already‐attached decoders (build chains).

== Synopsis

Declared in `<openssl/decoder.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_DECODER_CTX_add_extra(
    xref:OSSL_DECODER_CTX.adoc[OSSL_DECODER_CTX]* ctx,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Decoder context to extend.
| *libctx*
| Library context used when fetching extra decoders, or NULL for the default.
| *propq*
| Optional property query for fetching, or NULL.
|===


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