DECODER_CTX_new() returns a pointer to a <b>OSSL_DECODER_CTX</b>, or NULL if the context structure couldn&#39;t be allocated.</p>

<p>OSSL_DECODER_settable_ctx_params() returns an <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> array, or NULL if none is available.</p>

<p>OSSL_DECODER_CTX_set_params() returns 1 if all recognised parameters were valid, or 0 if one of them was invalid or caused some other failure in the implementation.</p>

<p>OSSL_DECODER_CTX_add_decoder(), OSSL_DECODER_CTX_add_extra(), 