1 /*
2  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_CLASSIFIER_H_
12 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_CLASSIFIER_H_
13 
14 extern "C" {
15 #include "celt.h"
16 #include "analysis.h"
17 #include "opus_private.h"
18 }
19 
20 #include "webrtc/base/scoped_ptr.h"
21 #include "webrtc/typedefs.h"
22 
23 namespace webrtc {
24 
25 // This class provides a speech/music classification and is a wrapper over the
26 // Opus classifier. It currently only supports 48 kHz mono or stereo with a
27 // frame size of 20 ms.
28 
29 class AudioClassifier {
30  public:
31   AudioClassifier();
32   virtual ~AudioClassifier();
33 
34   // Classifies one frame of audio data in input,
35   // input_length   : must be channels * 960;
36   // channels       : must be 1 (mono) or 2 (stereo).
37   bool Analysis(const int16_t* input, int input_length, int channels);
38 
39   // Gets the current classification : true = music, false = speech.
40   virtual bool is_music() const;
41 
42   // Gets the current music probability.
music_probability()43   float music_probability() const { return music_probability_; }
44 
45  private:
46   AnalysisInfo analysis_info_;
47   bool is_music_;
48   float music_probability_;
49   const CELTMode* celt_mode_;
50   TonalityAnalysisState analysis_state_;
51 };
52 
53 }  // namespace webrtc
54 
55 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_AUDIO_CLASSIFIER_H_
56