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| 1 /* | 1 /* |
| 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2011 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 /* digital_agc.c | 11 /* digital_agc.c |
| 12 * | 12 * |
| 13 */ | 13 */ |
| 14 | 14 |
| 15 #include "webrtc/modules/audio_processing/agc/legacy/digital_agc.h" | 15 #include "webrtc/modules/audio_processing/agc/legacy/digital_agc.h" |
| 16 | 16 |
| 17 #include <string.h> | 17 #include <string.h> |
| 18 #ifdef WEBRTC_AGC_DEBUG_DUMP | 18 #ifdef WEBRTC_AGC_DEBUG_DUMP |
| 19 #include <stdio.h> | 19 #include <stdio.h> |
| 20 #endif | 20 #endif |
| 21 | 21 |
| 22 #include "webrtc/base/checks.h" | 22 #include "webrtc/rtc_base/checks.h" |
| 23 #include "webrtc/modules/audio_processing/agc/legacy/gain_control.h" | 23 #include "webrtc/modules/audio_processing/agc/legacy/gain_control.h" |
| 24 | 24 |
| 25 // To generate the gaintable, copy&paste the following lines to a Matlab window: | 25 // To generate the gaintable, copy&paste the following lines to a Matlab window: |
| 26 // MaxGain = 6; MinGain = 0; CompRatio = 3; Knee = 1; | 26 // MaxGain = 6; MinGain = 0; CompRatio = 3; Knee = 1; |
| 27 // zeros = 0:31; lvl = 2.^(1-zeros); | 27 // zeros = 0:31; lvl = 2.^(1-zeros); |
| 28 // A = -10*log10(lvl) * (CompRatio - 1) / CompRatio; | 28 // A = -10*log10(lvl) * (CompRatio - 1) / CompRatio; |
| 29 // B = MaxGain - MinGain; | 29 // B = MaxGain - MinGain; |
| 30 // gains = round(2^16*10.^(0.05 * (MinGain + B * ( | 30 // gains = round(2^16*10.^(0.05 * (MinGain + B * ( |
| 31 // log(exp(-Knee*A)+exp(-Knee*B)) - log(1+exp(-Knee*B)) ) / | 31 // log(exp(-Knee*A)+exp(-Knee*B)) - log(1+exp(-Knee*B)) ) / |
| 32 // log(1/(1+exp(Knee*B)))))); | 32 // log(1/(1+exp(Knee*B)))))); |
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| 679 // limit | 679 // limit |
| 680 if (state->logRatio > 2048) { | 680 if (state->logRatio > 2048) { |
| 681 state->logRatio = 2048; | 681 state->logRatio = 2048; |
| 682 } | 682 } |
| 683 if (state->logRatio < -2048) { | 683 if (state->logRatio < -2048) { |
| 684 state->logRatio = -2048; | 684 state->logRatio = -2048; |
| 685 } | 685 } |
| 686 | 686 |
| 687 return state->logRatio; // Q10 | 687 return state->logRatio; // Q10 |
| 688 } | 688 } |
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