Yamaha Corp
application/octet-stream
Magic Bytes
Offset: 0
4D 52 56 4E
The Synthetic Music Mobile Application Format (SMAF) is a multimedia container developed by Yamaha Corporation specifically for portable electronic devices. It was predominantly used during the early 2000s to deliver polyphonic ringtones, combining synthetic audio with graphics and LED control data for feature phones. As a legacy format, it is now considered obsolete having been superseded by modern standards like MP3, and presents minimal security risks to contemporary systems.
Validation Code
How to validate .mmf files in Python
Python
def is_mmf(file_path: str) -> bool:
"""Check if file is a valid MMF by magic bytes."""
signature = bytes([0x4D, 0x52, 0x56, 0x4E])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .mmf files in Node.js
Node.js
function isMMF(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x52, 0x56, 0x4E]);
return buffer.subarray(0, 4).equals(signature);
}
Go
func IsMMF(data []byte) bool {
signature := []byte{0x4D, 0x52, 0x56, 0x4E}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
GET
/api/v1/mmf
curl https://filesignature.org/api/v1/mmf