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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 |
11 #include "webrtc/tools/agc/test_utils.h" | 11 #include "webrtc/tools/agc/test_utils.h" |
12 | 12 |
13 #include <cmath> | 13 #include <cmath> |
14 | 14 |
15 #include <algorithm> | 15 #include <algorithm> |
16 | 16 |
17 #include "webrtc/modules/interface/module_common_types.h" | 17 #include "webrtc/modules/interface/module_common_types.h" |
18 | 18 |
19 namespace webrtc { | 19 namespace webrtc { |
20 | 20 |
21 float MicLevel2Gain(int gain_range_db, int level) { | 21 float MicLevel2Gain(int gain_range_db, int level) { |
22 return (level - 127.0f) / 128.0f * gain_range_db / 2; | 22 return (level - 127.0f) / 128.0f * gain_range_db / 2; |
23 } | 23 } |
24 | 24 |
25 float Db2Linear(float db) { | 25 float Db2Linear(float db) { |
26 return powf(10.0f, db / 20.0f); | 26 return powf(10.0f, db / 20.0f); |
27 } | 27 } |
28 | 28 |
29 void ApplyGainLinear(float gain, float last_gain, AudioFrame* frame) { | 29 void ApplyGainLinear(float gain, float last_gain, AudioFrame* frame) { |
30 const int frame_length = frame->samples_per_channel_ * frame->num_channels_; | 30 const size_t frame_length = |
| 31 frame->samples_per_channel_ * frame->num_channels_; |
31 // Smooth the transition between gain levels across the frame. | 32 // Smooth the transition between gain levels across the frame. |
32 float smoothed_gain = last_gain; | 33 float smoothed_gain = last_gain; |
33 float gain_step = (gain - last_gain) / (frame_length - 1); | 34 float gain_step = (gain - last_gain) / (frame_length - 1); |
34 for (int i = 0; i < frame_length; ++i) { | 35 for (size_t i = 0; i < frame_length; ++i) { |
35 smoothed_gain += gain_step; | 36 smoothed_gain += gain_step; |
36 float sample = std::floor(frame->data_[i] * smoothed_gain + 0.5); | 37 float sample = std::floor(frame->data_[i] * smoothed_gain + 0.5); |
37 sample = std::max(std::min(32767.0f, sample), -32768.0f); | 38 sample = std::max(std::min(32767.0f, sample), -32768.0f); |
38 frame->data_[i] = static_cast<int16_t>(sample); | 39 frame->data_[i] = static_cast<int16_t>(sample); |
39 } | 40 } |
40 } | 41 } |
41 | 42 |
42 void ApplyGain(float gain_db, float last_gain_db, AudioFrame* frame) { | 43 void ApplyGain(float gain_db, float last_gain_db, AudioFrame* frame) { |
43 ApplyGainLinear(Db2Linear(gain_db), Db2Linear(last_gain_db), frame); | 44 ApplyGainLinear(Db2Linear(gain_db), Db2Linear(last_gain_db), frame); |
44 } | 45 } |
45 | 46 |
46 void SimulateMic(int gain_range_db, int mic_level, int last_mic_level, | 47 void SimulateMic(int gain_range_db, int mic_level, int last_mic_level, |
47 AudioFrame* frame) { | 48 AudioFrame* frame) { |
48 assert(mic_level >= 0 && mic_level <= 255); | 49 assert(mic_level >= 0 && mic_level <= 255); |
49 assert(last_mic_level >= 0 && last_mic_level <= 255); | 50 assert(last_mic_level >= 0 && last_mic_level <= 255); |
50 ApplyGain(MicLevel2Gain(gain_range_db, mic_level), | 51 ApplyGain(MicLevel2Gain(gain_range_db, mic_level), |
51 MicLevel2Gain(gain_range_db, last_mic_level), | 52 MicLevel2Gain(gain_range_db, last_mic_level), |
52 frame); | 53 frame); |
53 } | 54 } |
54 | 55 |
55 void SimulateMic(int gain_map[255], int mic_level, int last_mic_level, | 56 void SimulateMic(int gain_map[255], int mic_level, int last_mic_level, |
56 AudioFrame* frame) { | 57 AudioFrame* frame) { |
57 assert(mic_level >= 0 && mic_level <= 255); | 58 assert(mic_level >= 0 && mic_level <= 255); |
58 assert(last_mic_level >= 0 && last_mic_level <= 255); | 59 assert(last_mic_level >= 0 && last_mic_level <= 255); |
59 ApplyGain(gain_map[mic_level], gain_map[last_mic_level], frame); | 60 ApplyGain(gain_map[mic_level], gain_map[last_mic_level], frame); |
60 } | 61 } |
61 | 62 |
62 } // namespace webrtc | 63 } // namespace webrtc |
63 | 64 |
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