cut.py

import csv
import os

import pysrt
from pydub import AudioSegment


def srt_to_segments_with_metadata(srt_file, episode, audio_file, output_dir, metadata_file):
    # Load the SRT file
    subs = pysrt.open(srt_file)

    # Load the audio file
    audio = AudioSegment.from_wav(audio_file)

    # Ensure the output directory exists
    os.makedirs(output_dir, exist_ok=True)

    # Prepare the metadata file
    with open(metadata_file, mode='a', newline='', encoding='utf-8') as csvfile:
        csvwriter = csv.writer(csvfile)
        # csvwriter.writerow(['id', 'episode_id', 'file_name', 'audio_duration',
        #                    'transcription'])

        for index, sub in enumerate(subs):
            # Get start and end times in milliseconds
            start_time = sub.start.ordinal
            end_time = sub.end.ordinal

            # Calculate duration in seconds
            duration = (end_time - start_time) / 1000

            # Extract the audio segment
            segment = audio[start_time:end_time]

            # Define output filenames
            segment_filename = f"{episode}_{index + 1:03d}.wav"
            segment_id = f"{episode}_{index + 1:03d}"
            audio_filename = os.path.join(output_dir, segment_filename)

            # Export the audio segment
            segment.export(audio_filename, format="wav")

            # Write to the metadata CSV file
            csvwriter.writerow(
                [segment_id, episode, f'{episode}/{segment_filename}', f'{duration:.3f}', sub.text])

    print("Segmentation complete. Files saved to:", output_dir)
    print("Metadata saved to:", metadata_file)


if __name__ == "__main__":
    # subset = "saamgwokjinji"
    subset = "seoiwuzyun"
    # ffmpeg -i "webm/saamgwokjinji/034.webm" -vn -ar 44100 -c:a pcm_s16le "034.wav"
    for episode in range(1, 41):
        episode = f'{episode:03d}'

        srt_file = f'srt/{subset}/{episode}.srt'
        audio_file = f'{episode}.wav'
        output_dir = f'wav/{subset}/{episode}'
        srt_to_segments_with_metadata(
            srt_file, episode, audio_file, output_dir, f'{episode}.csv')