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Merge pull request #2680 from daspecster/add-speech-streaming-gapic
Add speech streaming recognition.
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‎packages/google-cloud-speech/google/cloud/speech/_gax.py‎

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Original file line numberDiff line numberDiff line change
@@ -106,6 +106,97 @@ def async_recognize(self, sample, language_code=None,
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return Operation.from_pb(response, self)
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def streaming_recognize(self, sample, language_code=None,
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max_alternatives=None, profanity_filter=None,
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speech_context=None, single_utterance=False,
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interim_results=False):
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"""Streaming speech recognition.
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.. note::
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Streaming recognition requests are limited to 1 minute of audio.
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See: https://cloud.google.com/speech/limits#content
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Yields :class:`~streaming_response.StreamingSpeechResponse` containing
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results and metadata from the streaming request.
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:type sample: :class:`~google.cloud.speech.sample.Sample`
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:param sample: Instance of ``Sample`` containing audio information.
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:type language_code: str
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:param language_code: (Optional) The language of the supplied audio as
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BCP-47 language tag. Example: ``'en-GB'``.
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If omitted, defaults to ``'en-US'``.
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:type max_alternatives: int
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:param max_alternatives: (Optional) Maximum number of recognition
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hypotheses to be returned. The server may
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return fewer than maxAlternatives.
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Valid values are 0-30. A value of 0 or 1
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will return a maximum of 1. Defaults to 1
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:type profanity_filter: bool
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:param profanity_filter: If True, the server will attempt to filter
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out profanities, replacing all but the
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initial character in each filtered word with
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asterisks, e.g. ``'f***'``. If False or
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omitted, profanities won't be filtered out.
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:type speech_context: list
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:param speech_context: A list of strings (max 50) containing words and
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phrases "hints" so that the speech recognition
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is more likely to recognize them. This can be
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used to improve the accuracy for specific words
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and phrases. This can also be used to add new
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words to the vocabulary of the recognizer.
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:type single_utterance: bool
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:param single_utterance: (Optional) If false or omitted, the recognizer
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will perform continuous recognition
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(continuing to process audio even if the user
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pauses speaking) until the client closes the
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output stream (gRPC API) or when the maximum
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time limit has been reached. Multiple
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SpeechRecognitionResults with the is_final
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flag set to true may be returned.
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If true, the recognizer will detect a single
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spoken utterance. When it detects that the
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user has paused or stopped speaking, it will
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return an END_OF_UTTERANCE event and cease
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recognition. It will return no more than one
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SpeechRecognitionResult with the is_final flag
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set to true.
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:type interim_results: bool
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:param interim_results: (Optional) If true, interim results (tentative
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hypotheses) may be returned as they become
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available (these interim results are indicated
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with the is_final=false flag). If false or
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omitted, only is_final=true result(s) are
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returned.
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:raises: :class:`ValueError` if sample.content is not a file-like
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object. :class:`ValueError` if stream has closed.
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:rtype: :class:`~google.cloud.grpc.speech.v1beta1\
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.cloud_speech_pb2.StreamingRecognizeResponse`
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:returns: ``StreamingRecognizeResponse`` instances.
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"""
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if getattr(sample.content, 'closed', None) is None:
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raise ValueError('Please use file-like object for data stream.')
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if sample.content.closed:
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raise ValueError('Stream is closed.')
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requests = _stream_requests(sample, language_code=language_code,
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max_alternatives=max_alternatives,
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profanity_filter=profanity_filter,
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speech_context=speech_context,
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single_utterance=single_utterance,
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interim_results=interim_results)
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api = self._gapic_api
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responses = api.streaming_recognize(requests)
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return responses
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def sync_recognize(self, sample, language_code=None, max_alternatives=None,
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profanity_filter=None, speech_context=None):
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"""Synchronous Speech Recognition.

‎packages/google-cloud-speech/google/cloud/speech/client.py‎

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Original file line numberDiff line numberDiff line change
@@ -159,6 +159,92 @@ def speech_api(self):
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self._speech_api = _JSONSpeechAPI(self)
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return self._speech_api
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def streaming_recognize(self, sample, language_code=None,
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max_alternatives=None, profanity_filter=None,
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speech_context=None, single_utterance=False,
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interim_results=False):
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"""Streaming speech recognition.
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.. note::
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Streaming recognition requests are limited to 1 minute of audio.
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See: https://cloud.google.com/speech/limits#content
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Yields: list of :class:`~google.cloud.speech.alternative.Alternatives`
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containing results and metadata from the streaming request.
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:type sample: :class:`~google.cloud.speech.sample.Sample`
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:param sample: Instance of ``Sample`` containing audio information.
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:type language_code: str
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:param language_code: (Optional) The language of the supplied audio as
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BCP-47 language tag. Example: ``'en-GB'``.
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If omitted, defaults to ``'en-US'``.
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:type max_alternatives: int
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:param max_alternatives: (Optional) Maximum number of recognition
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hypotheses to be returned. The server may
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return fewer than maxAlternatives.
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Valid values are 0-30. A value of 0 or 1
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will return a maximum of 1. Defaults to 1
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:type profanity_filter: bool
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:param profanity_filter: If True, the server will attempt to filter
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out profanities, replacing all but the
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initial character in each filtered word with
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asterisks, e.g. ``'f***'``. If False or
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omitted, profanities won't be filtered out.
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:type speech_context: list
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:param speech_context: A list of strings (max 50) containing words and
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phrases "hints" so that the speech recognition
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is more likely to recognize them. This can be
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used to improve the accuracy for specific words
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and phrases. This can also be used to add new
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words to the vocabulary of the recognizer.
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:type single_utterance: bool
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:param single_utterance: (Optional) If false or omitted, the recognizer
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will perform continuous recognition
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(continuing to process audio even if the user
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pauses speaking) until the client closes the
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output stream (gRPC API) or when the maximum
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time limit has been reached. Multiple
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SpeechRecognitionResults with the is_final
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flag set to true may be returned.
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If true, the recognizer will detect a single
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spoken utterance. When it detects that the
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user has paused or stopped speaking, it will
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return an END_OF_UTTERANCE event and cease
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recognition. It will return no more than one
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SpeechRecognitionResult with the is_final flag
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set to true.
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:type interim_results: bool
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:param interim_results: (Optional) If true, interim results (tentative
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hypotheses) may be returned as they become
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available (these interim results are indicated
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with the ``is_final=False`` flag). If false or
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omitted, only is_final=true result(s) are
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returned.
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:raises: EnvironmentError if gRPC is not available.
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"""
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if not self._use_gax:
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raise EnvironmentError('gRPC is required to use this API.')
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responses = self.speech_api.streaming_recognize(sample, language_code,
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max_alternatives,
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profanity_filter,
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speech_context,
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single_utterance,
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interim_results)
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for response in responses:
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for result in response.results:
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if result.is_final or interim_results:
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yield [Alternative.from_pb(alternative)
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for alternative in result.alternatives]
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def sync_recognize(self, sample, language_code=None,
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max_alternatives=None, profanity_filter=None,
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speech_context=None):

‎packages/google-cloud-speech/unit_tests/test__gax.py‎

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Original file line numberDiff line numberDiff line change
@@ -15,6 +15,35 @@
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import unittest
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class TestGAPICSpeechAPI(unittest.TestCase):
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SAMPLE_RATE = 16000
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def _getTargetClass(self):
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from google.cloud.speech._gax import GAPICSpeechAPI
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return GAPICSpeechAPI
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def _makeOne(self, *args, **kw):
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return self._getTargetClass()(*args, **kw)
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def test_use_bytes_instead_of_file_like_object(self):
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from google.cloud import speech
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from google.cloud.speech.sample import Sample
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credentials = {}
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client = speech.Client(credentials=credentials, use_gax=True)
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client.connection = _Connection()
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client.connection.credentials = credentials
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sample = Sample(content=b'', encoding=speech.Encoding.FLAC,
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sample_rate=self.SAMPLE_RATE)
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api = self._makeOne(client)
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with self.assertRaises(ValueError):
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api.streaming_recognize(sample)
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self.assertEqual(client.connection._requested, [])
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class TestSpeechGAXMakeRequests(unittest.TestCase):
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SAMPLE_RATE = 16000
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HINTS = ['hi']
@@ -137,3 +166,10 @@ def test_stream_requests(self):
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self.assertEqual(streaming_request.audio_content, self.AUDIO_CONTENT)
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self.assertIsInstance(config_request.streaming_config,
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StreamingRecognitionConfig)
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class _Connection(object):
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def __init__(self, *responses):
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self._responses = responses
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self._requested = []

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