adding example for streaming audio

speech/cloud-client/transcribe_streaming.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+# Copyright 2017 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Google Cloud Speech API sample application for transcribing audio streams
+
+Example usage:
+    python transcribe_stream resources/audio.raw
+
+"""
+
+# [START import_libraries]
+import logging
+from google.cloud import speech
+# [END import_libraries]
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+SAMPLE_RATE = 16000
+speech_client = speech.Client()
+
+
+def transcribe_stream(stream):
+    """Transcribe a stream of audio."""
+    logging.debug('{} is closed: {}'.format(str(stream), stream.closed))
+
+    sample = speech_client.sample(stream=stream,
+        encoding=speech.Encoding.LINEAR16,
+        sample_rate=SAMPLE_RATE)
+    results = list(sample.streaming_recognize())
+    print('results len:{}'.format(len(results)))
+    for result in results:
+        for alternative in result.alternatives:
+            print(str(alternative.confidence)+' '+str(alternative.transcript))
+
+
+def main(args):
+    with open(args.filename, 'rb') as stream:
+        transcribe_stream(stream)
+
+
+def parse_args():
+    import argparse
+    p = argparse.ArgumentParser()
+    p.add_argument('filename', type=str)
+    args = p.parse_args()
+    return args
+
+
+if __name__ == '__main__':
+    args = parse_args()
+    main(args)
+