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