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Add decibel conversion functions to //common_audio:common_audio

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The functions replace some existing code and will be used in the
the new AutomaticGainController.

Bug: webrtc:7949
Change-Id: I9a32132d4a4699a507b8548a2eac10972a2f3fd6
Reviewed-on: https://webrtc-review.googlesource.com/53141
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22045}
This commit is contained in:
Alex Loiko
2018-02-16 10:42:48 +01:00
committed by Commit Bot
parent e4be6dad65
commit 6df09f6f6a
8 changed files with 121 additions and 52 deletions
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3
modules/audio_coding/neteq/dtmf_tone_generator_unittest.cc
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@ -14,6 +14,7 @@
#include <math.h>
#include "common_audio/include/audio_util.h"
#include "modules/audio_coding/neteq/audio_multi_vector.h"
#include "test/gtest.h"
@ -79,7 +80,7 @@ class DtmfToneGeneratorTest : public ::testing::Test {
EXPECT_EQ(kNumSamples, tone_gen_.Generate(kNumSamples, &signal));
for (int n = 0; n < kNumSamples; ++n) {
double attenuation_factor =
pow(10, -static_cast<double>(attenuation) / 20);
DbToRatio(-static_cast<float>(attenuation));
// Verify that the attenuation is correct.
for (int channel = 0; channel < channels; ++channel) {
EXPECT_NEAR(attenuation_factor * ref_signal[channel][n],