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Upload utility%2Fcaptions%20%2Ftimed_captions_generator.py
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utility/utility%2Fcaptions%20%2Ftimed_captions_generator.py
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import whisper_timestamped as whisper
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from whisper_timestamped import load_model, transcribe_timestamped
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import re
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def generate_timed_captions(audio_filename,model_size="base"):
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WHISPER_MODEL = load_model(model_size)
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gen = transcribe_timestamped(WHISPER_MODEL, audio_filename, verbose=False, fp16=False)
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return getCaptionsWithTime(gen)
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def splitWordsBySize(words, maxCaptionSize):
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halfCaptionSize = maxCaptionSize / 2
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captions = []
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while words:
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caption = words[0]
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words = words[1:]
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while words and len(caption + ' ' + words[0]) <= maxCaptionSize:
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caption += ' ' + words[0]
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words = words[1:]
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if len(caption) >= halfCaptionSize and words:
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break
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captions.append(caption)
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return captions
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def getTimestampMapping(whisper_analysis):
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index = 0
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locationToTimestamp = {}
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for segment in whisper_analysis['segments']:
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for word in segment['words']:
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newIndex = index + len(word['text'])+1
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locationToTimestamp[(index, newIndex)] = word['end']
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index = newIndex
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return locationToTimestamp
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def cleanWord(word):
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return re.sub(r'[^\w\s\-_"\'\']', '', word)
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def interpolateTimeFromDict(word_position, d):
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for key, value in d.items():
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if key[0] <= word_position <= key[1]:
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return value
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return None
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def getCaptionsWithTime(whisper_analysis, maxCaptionSize=15, considerPunctuation=False):
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wordLocationToTime = getTimestampMapping(whisper_analysis)
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position = 0
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start_time = 0
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CaptionsPairs = []
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text = whisper_analysis['text']
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if considerPunctuation:
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sentences = re.split(r'(?<=[.!?]) +', text)
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words = [word for sentence in sentences for word in splitWordsBySize(sentence.split(), maxCaptionSize)]
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else:
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words = text.split()
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words = [cleanWord(word) for word in splitWordsBySize(words, maxCaptionSize)]
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for word in words:
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position += len(word) + 1
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end_time = interpolateTimeFromDict(position, wordLocationToTime)
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if end_time and word:
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CaptionsPairs.append(((start_time, end_time), word))
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start_time = end_time
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return CaptionsPairs
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