content/public/browser/speech_recognition_session_preamble.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_SESSION_PREAMBLE_H_
   6 #define CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_SESSION_PREAMBLE_H_
   7
   8 #include <vector>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace content {
  14
  15 // The preamble is the few seconds of audio before the speech recognition
  16 // starts. This is used to contain trigger audio used to start a voice
  17 // query, such as the 'Ok Google' hotword.
  18 struct CONTENT_EXPORT SpeechRecognitionSessionPreamble
  19     : public base::RefCounted<SpeechRecognitionSessionPreamble> {
  20   SpeechRecognitionSessionPreamble();
  21
  22   // Sampling rate (hz) for the preamble data. i.e. 44100, 32000, etc
  23   int sample_rate;
  24
  25   // Bytes per sample.
  26   int sample_depth;
  27
  28   // Audio data, in little-endian samples.
  29   std::vector<char> sample_data;
  30
  31  private:
  32   friend class base::RefCounted<SpeechRecognitionSessionPreamble>;
  33   ~SpeechRecognitionSessionPreamble();
  34 };
  35
  36 }  // namespace content
  37
  38 #endif  // CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_SESSION_PREAMBLE_H_