* @param[out] coeff 2 LPC coefficients, can be NULL
* @return data offset or negative error code if header is invalid
*/
+int ff_adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
+ int bufsize, int *header_size, int *coeff);
+
+#if LIBAVCODEC_VERSION_MAJOR < 56
int avpriv_adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
int bufsize, int *header_size, int *coeff);
+#endif
#endif /* AVCODEC_ADX_H */