| """ |
| ASVspoof 2021 LA protocol parser. |
| |
| Format (8 space-separated columns): |
| speaker_id utterance_id codec channel attack_id label trim partition |
| |
| speaker_id : anonymized speaker |
| utterance_id : filename without extension (e.g., "LA_E_9332881") |
| codec : audio codec applied (alaw, ulaw, g722, mp3, pcm, ...) |
| channel : transmission channel (ita_tx, sin_tx, loc_tx, ...) |
| attack_id : "-" for bonafide, "A07"-"A19" for spoof |
| label : "bonafide" or "spoof" |
| trim : "trim" or "notrim" |
| partition : "eval", "progress", or "hidden" |
| """ |
|
|
| from dataclasses import dataclass |
| from typing import List, Optional |
| import os |
|
|
|
|
| @dataclass |
| class Utterance2021: |
| """One row from an ASVspoof 2021 LA cm protocol file.""" |
| speaker_id: str |
| utterance_id: str |
| codec: str |
| channel: str |
| attack_id: str |
| label: str |
| label_int: int |
| trim: str |
| partition: str |
| flac_path: str |
|
|
|
|
| def parse_protocol_2021( |
| protocol_path: str, |
| audio_root: str, |
| partition_filter: Optional[str] = "eval", |
| ) -> List[Utterance2021]: |
| """Parse the 2021 LA cm protocol with keys. |
| |
| Args: |
| protocol_path: full path to trial_metadata.txt |
| audio_root: full path to the flac/ folder |
| partition_filter: only return rows matching this partition. |
| Valid: "eval", "progress", "hidden", or None for all. |
| |
| Returns: |
| List of Utterance2021 objects. |
| """ |
| utterances: List[Utterance2021] = [] |
| with open(protocol_path, "r") as f: |
| for line in f: |
| parts = line.strip().split() |
| if len(parts) != 8: |
| continue |
| speaker_id, utt_id, codec, channel, attack_id, label, trim, partition = parts |
|
|
| if partition_filter is not None and partition != partition_filter: |
| continue |
|
|
| label_int = 0 if label == "bonafide" else 1 |
| flac_path = os.path.join(audio_root, f"{utt_id}.flac") |
|
|
| utterances.append(Utterance2021( |
| speaker_id=speaker_id, |
| utterance_id=utt_id, |
| codec=codec, |
| channel=channel, |
| attack_id=attack_id, |
| label=label, |
| label_int=label_int, |
| trim=trim, |
| partition=partition, |
| flac_path=flac_path, |
| )) |
| return utterances |
|
|
