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Commit a3bb9a3a authored by Andy Hung's avatar Andy Hung
Browse files

Proper adjustment of filterlength for downsampling 



Bug: 12963040
Change-Id: I772b8efd3f7eae6d075994b210dd0168f5365f4d
Signed-off-by: default avatarAndy Hung <hunga@google.com>
parent c99144dd

services/audioflinger/AudioResamplerDyn.cpp

+14 −6
Original line number Diff line number Diff line
@@ -283,17 +283,25 @@ void AudioResamplerDyn::setSampleRate(int32_t inSampleRate) { 
            // 32b coefficients, 64 length

            useS32 = true;

            stopBandAtten = 98.;

            if (inSampleRate >= mSampleRate * 4) {

                halfLength = 48;

            } else if (inSampleRate >= mSampleRate * 2) {

                halfLength = 40;

            } else {

                halfLength = 32;

            }

        } else if (mFilterQuality == DYN_LOW_QUALITY) {

            // 16b coefficients, 16-32 length

            useS32 = false;

            stopBandAtten = 80.;

            if (mSampleRate >= inSampleRate * 2) {

            if (inSampleRate >= mSampleRate * 4) {

                halfLength = 24;

            } else if (inSampleRate >= mSampleRate * 2) {

                halfLength = 16;

            } else {

                halfLength = 8;

            }

            if (mSampleRate >= inSampleRate) {

            if (inSampleRate <= mSampleRate) {

                tbwCheat = 1.05;

            } else {

                tbwCheat = 1.03;
@@ -303,14 +311,14 @@ void AudioResamplerDyn::setSampleRate(int32_t inSampleRate) { 
            // note: > 64 length filters with 16b coefs can have quantization noise problems

            useS32 = false;

            stopBandAtten = 84.;

            if (mSampleRate >= inSampleRate * 4) {

            if (inSampleRate >= mSampleRate * 4) {

                halfLength = 32;

            } else if (mSampleRate >= inSampleRate * 2) {

            } else if (inSampleRate >= mSampleRate * 2) {

                halfLength = 24;

            } else {

                halfLength = 16;

            }

            if (mSampleRate >= inSampleRate) {

            if (inSampleRate <= mSampleRate) {

                tbwCheat = 1.03;

            } else {

                tbwCheat = 1.01;