midi-structure

midi-structure is a lightweight Python package that provides a simple, structured interface for processing MIDI‑related text queries. It leverages llmatch‑messages to enforce that LLM responses conform to a predefined regex pattern, ensuring consistent and machine‑readable output.

Note: The package ships with a default LLM implementation (ChatLLM7 from langchain_llm7). You can also supply any LangChain‑compatible LLM (e.g., OpenAI, Anthropic, Google Generative AI) if you prefer.

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🚀 Overview

• Structured MIDI queries – ask about instruments, file formats, protocol details, etc.
• Pattern‑based validation – responses are checked against a regex (pattern) defined in prompts.py.
• Pluggable LLM – use the built‑in ChatLLM7 or attach your own LangChain LLM.
• Zero configuration – just pass a string and get a list of extracted data.

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📦 Installation

pip install midi-structure

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🛠️ Quick Start

from midi-structure import midi-structure

# Simple call using the default ChatLLM7 (reads API key from LLM7_API_KEY env var)
response = midi-structure(
    user_input="What are the most common MIDI message types?"
)

print(response)   # → a list of strings that match the defined pattern

Parameters

Name	Type	Description
user_input	str	The natural‑language query related to MIDI.
llm	Optional[BaseChatModel]	A LangChain LLM instance. If omitted, ChatLLM7 is used.
api_key	Optional[str]	API key for LLM7. If not supplied, the function looks for the LLM7_API_KEY environment variable.

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🔄 Using a Custom LLM

You can pass any LangChain‑compatible chat model. Below are a few examples.

OpenAI

from langchain_openai import ChatOpenAI
from midi-structure import midi-structure

llm = ChatOpenAI()
response = midi-structure("Explain the MIDI file header format.", llm=llm)
print(response)

Anthropic

from langchain_anthropic import ChatAnthropic
from midi-structure import midi-structure

llm = ChatAnthropic()
response = midi-structure("List the standard General MIDI instruments.", llm=llm)
print(response)

Google Generative AI

from langchain_google_genai import ChatGoogleGenerativeAI
from midi-structure import midi-structure

llm = ChatGoogleGenerativeAI()
response = midi-structure("How does MIDI time stamping work?", llm=llm)
print(response)

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🔑 API Keys & Rate Limits

• LLM7 (default) offers a free tier that is sufficient for most typical usage.
• To obtain a free LLM7 API key, register at: https://token.llm7.io/
• You can provide the key in two ways:
  1. Set the environment variable LLM7_API_KEY.
  2. Pass it directly:

     response = midi-structure("...", api_key="your_api_key")
     

If you need higher rate limits, upgrade your LLM7 plan or switch to another LLM as shown above.

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🧩 Project Structure

midi_structure/
│
├─ __init__.py               # Exposes midi-structure function
├─ core.py                   # Implementation (the function shown above)
├─ prompts.py                # Holds system/human prompts and regex pattern
└─ ...                       # Additional helper modules

The core function performs the following steps:

1. Resolve the LLM (default = ChatLLM7).
2. Build system and human messages from the supplied prompts.
3. Compile the regex pattern.
4. Call llmatch to get a response that matches the pattern.
5. Return the extracted data as a list of strings.

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🤝 Contributing

We welcome contributions! If you find a bug or have a feature request, please open an issue on GitHub:

• Issues: https://github.com/chigwell/midi-structure/issues

Pull requests are encouraged. Please make sure tests pass and follow the existing code style.

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📄 License

This project is licensed under the MIT License.

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👤 Author

Eugene Evstafev

• Email: hi@euegne.plus
• GitHub: chigwell
• LinkedIn: Eugene Evstafev

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Happy coding with MIDI!