mirror of
https://github.com/m-bain/whisperX.git
synced 2025-07-01 18:17:27 -04:00
255 lines
9.6 KiB
Python
255 lines
9.6 KiB
Python
import os
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import zlib
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from typing import Callable, TextIO, Iterator, Tuple
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import pandas as pd
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import numpy as np
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def exact_div(x, y):
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assert x % y == 0
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return x // y
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def str2bool(string):
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str2val = {"True": True, "False": False}
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if string in str2val:
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return str2val[string]
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else:
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raise ValueError(f"Expected one of {set(str2val.keys())}, got {string}")
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def optional_int(string):
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return None if string == "None" else int(string)
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def optional_float(string):
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return None if string == "None" else float(string)
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def compression_ratio(text) -> float:
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text_bytes = text.encode("utf-8")
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return len(text_bytes) / len(zlib.compress(text_bytes))
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def format_timestamp(seconds: float, always_include_hours: bool = False, decimal_marker: str = '.'):
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assert seconds >= 0, "non-negative timestamp expected"
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milliseconds = round(seconds * 1000.0)
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hours = milliseconds // 3_600_000
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milliseconds -= hours * 3_600_000
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minutes = milliseconds // 60_000
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milliseconds -= minutes * 60_000
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seconds = milliseconds // 1_000
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milliseconds -= seconds * 1_000
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hours_marker = f"{hours:02d}:" if always_include_hours or hours > 0 else ""
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return f"{hours_marker}{minutes:02d}:{seconds:02d}{decimal_marker}{milliseconds:03d}"
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def write_txt(transcript: Iterator[dict], file: TextIO):
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for segment in transcript:
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print(segment['text'].strip(), file=file, flush=True)
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def write_vtt(transcript: Iterator[dict], file: TextIO):
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print("WEBVTT\n", file=file)
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for segment in transcript:
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print(
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f"{format_timestamp(segment['start'])} --> {format_timestamp(segment['end'])}\n"
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f"{segment['text'].strip().replace('-->', '->')}\n",
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file=file,
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flush=True,
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)
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def write_tsv(transcript: Iterator[dict], file: TextIO):
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print("start", "end", "text", sep="\t", file=file)
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for segment in transcript:
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print(round(1000 * segment['start']), file=file, end="\t")
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print(round(1000 * segment['end']), file=file, end="\t")
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print(segment['text'].strip().replace("\t", " "), file=file, flush=True)
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def write_srt(transcript: Iterator[dict], file: TextIO):
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"""
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Write a transcript to a file in SRT format.
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Example usage:
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from pathlib import Path
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from whisper.utils import write_srt
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result = transcribe(model, audio_path, temperature=temperature, **args)
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# save SRT
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audio_basename = Path(audio_path).stem
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with open(Path(output_dir) / (audio_basename + ".srt"), "w", encoding="utf-8") as srt:
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write_srt(result["segments"], file=srt)
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"""
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for i, segment in enumerate(transcript, start=1):
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# write srt lines
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print(
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f"{i}\n"
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f"{format_timestamp(segment['start'], always_include_hours=True, decimal_marker=',')} --> "
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f"{format_timestamp(segment['end'], always_include_hours=True, decimal_marker=',')}\n"
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f"{segment['text'].strip().replace('-->', '->')}\n",
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file=file,
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flush=True,
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)
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def write_ass(transcript: Iterator[dict],
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file: TextIO,
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resolution: str = "word",
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color: str = None, underline=True,
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prefmt: str = None, suffmt: str = None,
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font: str = None, font_size: int = 24,
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strip=True, **kwargs):
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"""
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Credit: https://github.com/jianfch/stable-ts/blob/ff79549bd01f764427879f07ecd626c46a9a430a/stable_whisper/text_output.py
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Generate Advanced SubStation Alpha (ass) file from results to
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display both phrase-level & word-level timestamp simultaneously by:
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-using segment-level timestamps display phrases as usual
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-using word-level timestamps change formats (e.g. color/underline) of the word in the displayed segment
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Note: ass file is used in the same way as srt, vtt, etc.
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Parameters
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----------
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transcript: dict
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results from modified model
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file: TextIO
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file object to write to
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resolution: str
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"word" or "char", timestamp resolution to highlight.
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color: str
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color code for a word at its corresponding timestamp
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<bbggrr> reverse order hexadecimal RGB value (e.g. FF0000 is full intensity blue. Default: 00FF00)
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underline: bool
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whether to underline a word at its corresponding timestamp
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prefmt: str
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used to specify format for word-level timestamps (must be use with 'suffmt' and overrides 'color'&'underline')
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appears as such in the .ass file:
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Hi, {<prefmt>}how{<suffmt>} are you?
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reference [Appendix A: Style override codes] in http://www.tcax.org/docs/ass-specs.htm
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suffmt: str
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used to specify format for word-level timestamps (must be use with 'prefmt' and overrides 'color'&'underline')
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appears as such in the .ass file:
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Hi, {<prefmt>}how{<suffmt>} are you?
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reference [Appendix A: Style override codes] in http://www.tcax.org/docs/ass-specs.htm
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font: str
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word font (default: Arial)
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font_size: int
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word font size (default: 48)
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kwargs:
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used for format styles:
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'Name', 'Fontname', 'Fontsize', 'PrimaryColour', 'SecondaryColour', 'OutlineColour', 'BackColour', 'Bold',
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'Italic', 'Underline', 'StrikeOut', 'ScaleX', 'ScaleY', 'Spacing', 'Angle', 'BorderStyle', 'Outline',
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'Shadow', 'Alignment', 'MarginL', 'MarginR', 'MarginV', 'Encoding'
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"""
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fmt_style_dict = {'Name': 'Default', 'Fontname': 'Arial', 'Fontsize': '48', 'PrimaryColour': '&Hffffff',
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'SecondaryColour': '&Hffffff', 'OutlineColour': '&H0', 'BackColour': '&H0', 'Bold': '0',
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'Italic': '0', 'Underline': '0', 'StrikeOut': '0', 'ScaleX': '100', 'ScaleY': '100',
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'Spacing': '0', 'Angle': '0', 'BorderStyle': '1', 'Outline': '1', 'Shadow': '0',
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'Alignment': '2', 'MarginL': '10', 'MarginR': '10', 'MarginV': '10', 'Encoding': '0'}
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for k, v in filter(lambda x: 'colour' in x[0].lower() and not str(x[1]).startswith('&H'), kwargs.items()):
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kwargs[k] = f'&H{kwargs[k]}'
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fmt_style_dict.update((k, v) for k, v in kwargs.items() if k in fmt_style_dict)
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if font:
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fmt_style_dict.update(Fontname=font)
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if font_size:
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fmt_style_dict.update(Fontsize=font_size)
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fmts = f'Format: {", ".join(map(str, fmt_style_dict.keys()))}'
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styles = f'Style: {",".join(map(str, fmt_style_dict.values()))}'
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ass_str = f'[Script Info]\nScriptType: v4.00+\nPlayResX: 384\nPlayResY: 288\nScaledBorderAndShadow: yes\n\n' \
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f'[V4+ Styles]\n{fmts}\n{styles}\n\n' \
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f'[Events]\nFormat: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\n\n'
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if prefmt or suffmt:
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if suffmt:
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assert prefmt, 'prefmt must be used along with suffmt'
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else:
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suffmt = r'\r'
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else:
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if not color:
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color = 'HFF00'
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underline_code = r'\u1' if underline else ''
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prefmt = r'{\1c&' + f'{color.upper()}&{underline_code}' + '}'
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suffmt = r'{\r}'
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def secs_to_hhmmss(secs: Tuple[float, int]):
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mm, ss = divmod(secs, 60)
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hh, mm = divmod(mm, 60)
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return f'{hh:0>1.0f}:{mm:0>2.0f}:{ss:0>2.2f}'
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def dialogue(chars: str, start: float, end: float, idx_0: int, idx_1: int) -> str:
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if idx_0 == -1:
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text = chars
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else:
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text = f'{chars[:idx_0]}{prefmt}{chars[idx_0:idx_1]}{suffmt}{chars[idx_1:]}'
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return f"Dialogue: 0,{secs_to_hhmmss(start)},{secs_to_hhmmss(end)}," \
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f"Default,,0,0,0,,{text.strip() if strip else text}"
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if resolution == "word":
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resolution_key = "word-segments"
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elif resolution == "char":
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resolution_key = "char-segments"
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else:
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raise ValueError(".ass resolution should be 'word' or 'char', not ", resolution)
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ass_arr = []
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for segment in transcript:
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if resolution_key in segment:
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res_segs = pd.DataFrame(segment[resolution_key])
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prev = segment['start']
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if "speaker" in segment:
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speaker_str = f"[{segment['speaker']}]: "
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else:
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speaker_str = ""
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for cdx, crow in res_segs.iterrows():
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if not np.isnan(crow['start']):
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if resolution == "char":
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idx_0 = cdx
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idx_1 = cdx + 1
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elif resolution == "word":
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idx_0 = int(crow["segment-text-start"])
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idx_1 = int(crow["segment-text-end"])
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# fill gap
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if crow['start'] > prev:
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filler_ts = {
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"chars": speaker_str + segment['text'],
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"start": prev,
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"end": crow['start'],
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"idx_0": -1,
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"idx_1": -1
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}
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ass_arr.append(filler_ts)
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# highlight current word
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f_word_ts = {
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"chars": speaker_str + segment['text'],
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"start": crow['start'],
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"end": crow['end'],
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"idx_0": idx_0 + len(speaker_str),
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"idx_1": idx_1 + len(speaker_str)
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}
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ass_arr.append(f_word_ts)
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prev = crow['end']
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ass_str += '\n'.join(map(lambda x: dialogue(**x), ass_arr))
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file.write(ass_str)
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def interpolate_nans(x, method='nearest'):
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if x.notnull().sum() > 1:
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return x.interpolate(method=method).ffill().bfill()
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else:
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return x.ffill().bfill() |