如何将MIDI-CSV转换后的文件转换为两个指定格式的列表？

Step 1: Break Down the CSV Line Structure #

First, let's clarify the parts we care about in your MIDI-CSV lines. Each line like this:

2, 960, Note_on_c, 0, 76, 71

The key value here is the 5th element (zero-indexed position 4) — that's the raw MIDI note number we need to adjust for your keyboard input.

Step 2: Define the Conversion Logic #

Your requirements are straightforward:

• For every Note_on_c line, take the MIDI note number, subtract 20, and add the result to NoteList.
• For each corresponding Note_on_c entry, add 'EthNote' to NoteTypeList.

We can ignore Note_off_c lines entirely since they don't contribute to your target lists.

Step 3: Practical Implementation (Python) #

Here's a simple, readable script that processes your CSV data and builds the two lists. I'll use sample lines from your example, but you can easily adapt this to read from your actual CSV file:

# Replace this with code to read from your CSV file (e.g., using open() or csv module)
csv_lines = [
    "2, 960, Note_on_c, 0, 76, 71",
    "2, 1200, Note_off_c, 0, 76, 0",
    "2, 1200, Note_on_c, 0, 75, 38",
    "2, 1440, Note_off_c, 0, 75, 0"
]

NoteList = []
NoteTypeList = []

for line in csv_lines:
    # Split the line into components and clean up whitespace
    components = [item.strip() for item in line.split(",")]
    # Only process Note_on_c events
    if components[2] == "Note_on_c":
        # Convert the MIDI note to an integer, adjust for keyboard input
        adjusted_note = int(components[4]) - 20
        NoteList.append(adjusted_note)
        # Add the fixed note type
        NoteTypeList.append('EthNote')

# Print the final result
print("NoteList =", NoteList)
print("NoteTypeList =", NoteTypeList)

Step 4: Expected Output #

Running this script will produce exactly the output you're looking for:

NoteList = [56, 55]
NoteTypeList = ['EthNote', 'EthNote']

Quick Tips for Production #

• If you're working with a large CSV file, use Python's built-in csv module instead of splitting lines manually — it handles edge cases (like unexpected whitespace) more reliably.
• Double-check for Note_on_c lines with a velocity of 0: some MIDI files use these as implicit note-off events, so you might want to skip those to avoid adding unwanted entries to your lists.

内容的提问来源于stack exchange，提问作者Tyler Bloom