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144 lines
5.4 KiB
144 lines
5.4 KiB
"""Contains the speech segment class."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from data_utils.audio import AudioSegment
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class SpeechSegment(AudioSegment):
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"""Speech segment abstraction, a subclass of AudioSegment,
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with an additional transcript.
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:param samples: Audio samples [num_samples x num_channels].
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:type samples: ndarray.float32
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:param sample_rate: Audio sample rate.
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:type sample_rate: int
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:param transcript: Transcript text for the speech.
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:type transript: basestring
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:raises TypeError: If the sample data type is not float or int.
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"""
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def __init__(self, samples, sample_rate, transcript):
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AudioSegment.__init__(self, samples, sample_rate)
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self._transcript = transcript
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def __eq__(self, other):
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"""Return whether two objects are equal.
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"""
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if not AudioSegment.__eq__(self, other):
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return False
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if self._transcript != other._transcript:
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return False
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return True
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def __ne__(self, other):
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"""Return whether two objects are unequal."""
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return not self.__eq__(other)
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@classmethod
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def from_file(cls, filepath, transcript):
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"""Create speech segment from audio file and corresponding transcript.
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:param filepath: Filepath or file object to audio file.
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:type filepath: basestring|file
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:param transcript: Transcript text for the speech.
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:type transript: basestring
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:return: Audio segment instance.
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:rtype: AudioSegment
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"""
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audio = AudioSegment.from_file(filepath)
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return cls(audio.samples, audio.sample_rate, transcript)
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@classmethod
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def from_bytes(cls, bytes, transcript):
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"""Create speech segment from a byte string and corresponding
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transcript.
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:param bytes: Byte string containing audio samples.
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:type bytes: str
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:param transcript: Transcript text for the speech.
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:type transript: basestring
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:return: Audio segment instance.
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:rtype: AudioSegment
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"""
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audio = AudioSegment.from_bytes(bytes)
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return cls(audio.samples, audio.sample_rate, transcript)
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@classmethod
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def concatenate(cls, *segments):
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"""Concatenate an arbitrary number of speech segments together.
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:param *segments: Input speech segments to be concatenated.
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:type *segments: tuple of SpeechSegment
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:return: Speech segment instance.
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:rtype: SpeechSegment
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:raises ValueError: If the number of segments is zero, or if the
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sample_rate of any two segments does not match.
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:raises TypeError: If every item in segments is not SpeechSegment
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instance.
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"""
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if len(segments) == 0:
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raise ValueError("No speech segments are given to concatenate.")
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sample_rate = segments[0]._sample_rate
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transcripts = ""
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for seg in segments:
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if sample_rate != seg._sample_rate:
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raise ValueError("Can't concatenate segments with "
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"different sample rates")
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if type(seg) is not cls:
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raise TypeError("Only speech segments of the same type "
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"instance can be concatenated.")
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transcripts += seg._transcript
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samples = np.concatenate([seg.samples for seg in segments])
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return cls(samples, sample_rate, transcripts)
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@classmethod
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def slice_from_file(cls, filepath, start=None, end=None, transcript=""):
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"""Loads a small section of an speech without having to load
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the entire file into the memory which can be incredibly wasteful.
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:param filepath: Filepath or file object to audio file.
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:type filepath: basestring|file
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:param start: Start time in seconds. If start is negative, it wraps
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around from the end. If not provided, this function
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reads from the very beginning.
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:type start: float
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:param end: End time in seconds. If end is negative, it wraps around
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from the end. If not provided, the default behvaior is
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to read to the end of the file.
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:type end: float
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:param transcript: Transcript text for the speech. if not provided,
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the defaults is an empty string.
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:type transript: basestring
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:return: SpeechSegment instance of the specified slice of the input
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speech file.
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:rtype: SpeechSegment
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"""
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audio = Audiosegment.slice_from_file(filepath, start, end)
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return cls(audio.samples, audio.sample_rate, transcript)
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@classmethod
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def make_silence(cls, duration, sample_rate):
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"""Creates a silent speech segment of the given duration and
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sample rate.
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:param duration: Length of silence in seconds.
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:type duration: float
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:param sample_rate: Sample rate.
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:type sample_rate: float
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:return: Silence of the given duration.
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:rtype: SpeechSegment
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"""
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audio = AudioSegment.make_silence(duration, sample_rate)
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return cls(audio.samples, audio.sample_rate, "")
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@property
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def transcript(self):
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"""Return the transcript text.
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:return: Transcript text for the speech.
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:rtype: basestring
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"""
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return self._transcript
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