mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-20 23:17:29 +00:00
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
|
|
* 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_;
|
|
}
|
|
|
|
} // namespace webrtc
|