Remove AudioClassifier

webrtc/modules/audio_coding/neteq/audio_classifier.cc

-/*
- *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/modules/audio_coding/neteq/audio_classifier.h"
-
-#include <assert.h>
-#include <string.h>
-
-namespace webrtc {
-
-static const int kDefaultSampleRateHz = 48000;
-static const int kDefaultFrameRateHz = 50;
-static const int kDefaultFrameSizeSamples =
-    kDefaultSampleRateHz / kDefaultFrameRateHz;
-static const float kDefaultThreshold = 0.5f;
-
-AudioClassifier::AudioClassifier()
-    : analysis_info_(),
-      is_music_(false),
-      music_probability_(0),
-      // This actually assigns the pointer to a static constant struct
-      // rather than creates a struct and |celt_mode_| does not need
-      // to be deleted.
-      celt_mode_(opus_custom_mode_create(kDefaultSampleRateHz,
-                                         kDefaultFrameSizeSamples,
-                                         NULL)),
-      analysis_state_() {
-  assert(celt_mode_);
-}
-
-AudioClassifier::~AudioClassifier() {}
-
-bool AudioClassifier::Analysis(const int16_t* input,
-                               int input_length,
-                               int channels) {
-  // Must be 20 ms frames at 48 kHz sampling.
-  assert((input_length / channels) == kDefaultFrameSizeSamples);
-
-  // Only mono or stereo are allowed.
-  assert(channels == 1 || channels == 2);
-
-  // Call Opus' classifier, defined in
-  // "third_party/opus/src/src/analysis.h", with lsb_depth = 16.
-  // Also uses a down-mixing function downmix_int, defined in
-  // "third_party/opus/src/src/opus_private.h", with
-  // constants c1 = 0, and c2 = -2.
-  run_analysis(&analysis_state_,
-               celt_mode_,
-               input,
-               kDefaultFrameSizeSamples,
-               kDefaultFrameSizeSamples,
-               0,
-               -2,
-               channels,
-               kDefaultSampleRateHz,
-               16,
-               downmix_int,
-               &analysis_info_);
-  music_probability_ = analysis_info_.music_prob;
-  is_music_ = music_probability_ > kDefaultThreshold;
-  return is_music_;
-}
-
-bool AudioClassifier::is_music() const {
-  return is_music_;
-}
-
-}  // namespace webrtc