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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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62 static const size_t kInputDownsampLength = 40; | 62 static const size_t kInputDownsampLength = 40; |
63 static const size_t kMaxCorrelationLength = 60; | 63 static const size_t kMaxCorrelationLength = 60; |
64 | 64 |
65 // Calls |expand_| to get more expansion data to merge with. The data is | 65 // Calls |expand_| to get more expansion data to merge with. The data is |
66 // written to |expanded_signal_|. Returns the length of the expanded data, | 66 // written to |expanded_signal_|. Returns the length of the expanded data, |
67 // while |expand_period| will be the number of samples in one expansion period | 67 // while |expand_period| will be the number of samples in one expansion period |
68 // (typically one pitch period). The value of |old_length| will be the number | 68 // (typically one pitch period). The value of |old_length| will be the number |
69 // of samples that were taken from the |sync_buffer_|. | 69 // of samples that were taken from the |sync_buffer_|. |
70 size_t GetExpandedSignal(size_t* old_length, size_t* expand_period); | 70 size_t GetExpandedSignal(size_t* old_length, size_t* expand_period); |
71 | 71 |
72 // Analyzes |input| and |expanded_signal| to find maximum values. Returns | 72 // Analyzes |input| and |expanded_signal| and returns muting factor (Q14) to |
73 // a muting factor (Q14) to be used on the new data. | 73 // be used on the new data. |
74 int16_t SignalScaling(const int16_t* input, size_t input_length, | 74 int16_t SignalScaling(const int16_t* input, size_t input_length, |
75 const int16_t* expanded_signal, | 75 const int16_t* expanded_signal) const; |
76 int16_t* expanded_max, int16_t* input_max) const; | |
77 | 76 |
78 // Downsamples |input| (|input_length| samples) and |expanded_signal| to | 77 // Downsamples |input| (|input_length| samples) and |expanded_signal| to |
79 // 4 kHz sample rate. The downsampled signals are written to | 78 // 4 kHz sample rate. The downsampled signals are written to |
80 // |input_downsampled_| and |expanded_downsampled_|, respectively. | 79 // |input_downsampled_| and |expanded_downsampled_|, respectively. |
81 void Downsample(const int16_t* input, size_t input_length, | 80 void Downsample(const int16_t* input, size_t input_length, |
82 const int16_t* expanded_signal, size_t expanded_length); | 81 const int16_t* expanded_signal, size_t expanded_length); |
83 | 82 |
84 // Calculates cross-correlation between |input_downsampled_| and | 83 // Calculates cross-correlation between |input_downsampled_| and |
85 // |expanded_downsampled_|, and finds the correlation maximum. The maximizing | 84 // |expanded_downsampled_|, and finds the correlation maximum. The maximizing |
86 // lag is returned. | 85 // lag is returned. |
87 size_t CorrelateAndPeakSearch(int16_t expanded_max, int16_t input_max, | 86 size_t CorrelateAndPeakSearch(size_t start_position, size_t input_length, |
88 size_t start_position, size_t input_length, | |
89 size_t expand_period) const; | 87 size_t expand_period) const; |
90 | 88 |
91 const int fs_mult_; // fs_hz_ / 8000. | 89 const int fs_mult_; // fs_hz_ / 8000. |
92 const size_t timestamps_per_call_; | 90 const size_t timestamps_per_call_; |
93 Expand* expand_; | 91 Expand* expand_; |
94 SyncBuffer* sync_buffer_; | 92 SyncBuffer* sync_buffer_; |
95 int16_t expanded_downsampled_[kExpandDownsampLength]; | 93 int16_t expanded_downsampled_[kExpandDownsampLength]; |
96 int16_t input_downsampled_[kInputDownsampLength]; | 94 int16_t input_downsampled_[kInputDownsampLength]; |
97 AudioMultiVector expanded_; | 95 AudioMultiVector expanded_; |
98 | 96 |
99 RTC_DISALLOW_COPY_AND_ASSIGN(Merge); | 97 RTC_DISALLOW_COPY_AND_ASSIGN(Merge); |
100 }; | 98 }; |
101 | 99 |
102 } // namespace webrtc | 100 } // namespace webrtc |
103 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_MERGE_H_ | 101 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_MERGE_H_ |
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