/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "VideoEditorBGAudioProcessing"
#include <utils/Log.h>
#include "VideoEditorBGAudioProcessing.h"
namespace android {
VideoEditorBGAudioProcessing::VideoEditorBGAudioProcessing() {
ALOGV("Constructor");
mAudVolArrIndex = 0;
mDoDucking = 0;
mDucking_enable = 0;
mDucking_lowVolume = 0;
mDucking_threshold = 0;
mDuckingFactor = 0;
mBTVolLevel = 0;
mPTVolLevel = 0;
mIsSSRCneeded = 0;
mChannelConversion = 0;
mBTFormat = MONO_16_BIT;
mInSampleRate = 8000;
mOutSampleRate = 16000;
mPTChannelCount = 2;
mBTChannelCount = 1;
}
M4OSA_Int32 VideoEditorBGAudioProcessing::mixAndDuck(
void *primaryTrackBuffer,
void *backgroundTrackBuffer,
void *outBuffer) {
ALOGV("mixAndDuck: track buffers (primary: 0x%x and background: 0x%x) "
"and out buffer 0x%x",
primaryTrackBuffer, backgroundTrackBuffer, outBuffer);
M4AM_Buffer16* pPrimaryTrack = (M4AM_Buffer16*)primaryTrackBuffer;
M4AM_Buffer16* pBackgroundTrack = (M4AM_Buffer16*)backgroundTrackBuffer;
M4AM_Buffer16* pMixedOutBuffer = (M4AM_Buffer16*)outBuffer;
// Output size if same as PT size
pMixedOutBuffer->m_bufferSize = pPrimaryTrack->m_bufferSize;
// Before mixing, we need to have only PT as out buffer
memcpy((void *)pMixedOutBuffer->m_dataAddress,
(void *)pPrimaryTrack->m_dataAddress, pMixedOutBuffer->m_bufferSize);
// Initialize ducking variables
// Initially contains the input primary track
M4OSA_Int16 *pPTMdata2 = (M4OSA_Int16*)pMixedOutBuffer->m_dataAddress;
// Contains BG track processed data(like channel conversion etc..
M4OSA_Int16 *pBTMdata1 = (M4OSA_Int16*) pBackgroundTrack->m_dataAddress;
// Since we need to give sample count and not buffer size
M4OSA_UInt32 uiPCMsize = pMixedOutBuffer->m_bufferSize / 2 ;
if ((mDucking_enable) && (mPTVolLevel != 0.0)) {
M4OSA_Int32 peakDbValue = 0;
M4OSA_Int32 previousDbValue = 0;
M4OSA_Int16 *pPCM16Sample = (M4OSA_Int16*)pPrimaryTrack->m_dataAddress;
const size_t n = pPrimaryTrack->m_bufferSize / sizeof(M4OSA_Int16);
for (size_t loopIndex = 0; loopIndex < n; ++loopIndex) {
if (pPCM16Sample[loopIndex] >= 0) {
peakDbValue = previousDbValue > pPCM16Sample[loopIndex] ?
previousDbValue : pPCM16Sample[loopIndex];
previousDbValue = peakDbValue;
} else {
peakDbValue = previousDbValue > -pPCM16Sample[loopIndex] ?
previousDbValue: -pPCM16Sample[loopIndex];
previousDbValue = peakDbValue;
}
}
mAudioVolumeArray[mAudVolArrIndex] = getDecibelSound(peakDbValue);
// Check for threshold is done after kProcessingWindowSize cycles
if (mAudVolArrIndex >= kProcessingWindowSize - 1) {
mDoDucking = isThresholdBreached(
mAudioVolumeArray, mAudVolArrIndex, mDucking_threshold);
mAudVolArrIndex = 0;
} else {
mAudVolArrIndex++;
}
//
// Below logic controls the mixing weightage
// for Background and Primary Tracks
// for the duration of window under analysis,
// to give fade-out for Background and fade-in for primary
// Current fading factor is distributed in equal range over
// the defined window size.
// For a window size = 25
// (500 ms (window under analysis) / 20 ms (sample duration))
//
if (mDoDucking) {
if (mDuckingFactor > mDucking_lowVolume) {
// FADE OUT BG Track
// Increment ducking factor in total steps in factor
// of low volume steps to reach low volume level
mDuckingFactor -= mDucking_lowVolume;
} else {
mDuckingFactor = mDucking_lowVolume;
}
} else {
if (mDuckingFactor < 1.0 ) {
// FADE IN BG Track
// Increment ducking factor in total steps of
// low volume factor to reach orig.volume level
mDuckingFactor += mDucking_lowVolume;
} else {
mDuckingFactor = 1.0;
}
}
} // end if - mDucking_enable
// Mixing logic
ALOGV("Out of Ducking analysis uiPCMsize %d %f %f",
mDoDucking, mDuckingFactor, mBTVolLevel);
while (uiPCMsize-- > 0) {
// Set vol factor for BT and PT
*pBTMdata1 = (M4OSA_Int16)(*pBTMdata1*mBTVolLevel);
*pPTMdata2 = (M4OSA_Int16)(*pPTMdata2*mPTVolLevel);
// Mix the two samples
if (mDoDucking) {
// Duck the BG track to ducking factor value before mixing
*pBTMdata1 = (M4OSA_Int16)((*pBTMdata1)*(mDuckingFactor));
// mix as normal case
*pBTMdata1 = (M4OSA_Int16)(*pBTMdata1 /2 + *pPTMdata2 /2);
} else {
*pBTMdata1 = (M4OSA_Int16)((*pBTMdata1)*(mDuckingFactor));
*pBTMdata1 = (M4OSA_Int16)(*pBTMdata1 /2 + *pPTMdata2 /2);
}
M4OSA_Int32 temp;
if (*pBTMdata1 < 0) {
temp = -(*pBTMdata1) * 2; // bring to original Amplitude level
if (temp > 32767) {
*pBTMdata1 = -32766; // less then max allowed value
} else {
*pBTMdata1 = (M4OSA_Int16)(-temp);
}
} else {
temp = (*pBTMdata1) * 2; // bring to original Amplitude level
if ( temp > 32768) {
*pBTMdata1 = 32767; // less than max allowed value
} else {
*pBTMdata1 = (M4OSA_Int16)temp;
}
}
pBTMdata1++;
pPTMdata2++;
}
memcpy((void *)pMixedOutBuffer->m_dataAddress,
(void *)pBackgroundTrack->m_dataAddress,
pBackgroundTrack->m_bufferSize);
ALOGV("mixAndDuck: X");
return M4NO_ERROR;
}
M4OSA_Int32 VideoEditorBGAudioProcessing::calculateOutResampleBufSize() {
// This already takes care of channel count in mBTBuffer.m_bufferSize
return (mOutSampleRate / mInSampleRate) * mBTBuffer.m_bufferSize;
}
void VideoEditorBGAudioProcessing::setMixParams(
const AudioMixSettings& setting) {
ALOGV("setMixParams");
mDucking_enable = setting.lvInDucking_enable;
mDucking_lowVolume = setting.lvInDucking_lowVolume;
mDucking_threshold = setting.lvInDucking_threshold;
mPTVolLevel = setting.lvPTVolLevel;
mBTVolLevel = setting.lvBTVolLevel ;
mBTChannelCount = setting.lvBTChannelCount;
mPTChannelCount = setting.lvPTChannelCount;
mBTFormat = setting.lvBTFormat;
mInSampleRate = setting.lvInSampleRate;
mOutSampleRate = setting.lvOutSampleRate;
// Reset the following params to default values
mAudVolArrIndex = 0;
mDoDucking = 0;
mDuckingFactor = 1.0;
ALOGV("ducking enable 0x%x lowVolume %f threshold %d "
"fPTVolLevel %f BTVolLevel %f",
mDucking_enable, mDucking_lowVolume, mDucking_threshold,
mPTVolLevel, mPTVolLevel);
// Decides if SSRC support is needed for this mixing
mIsSSRCneeded = (setting.lvInSampleRate != setting.lvOutSampleRate);
if (setting.lvBTChannelCount != setting.lvPTChannelCount){
if (setting.lvBTChannelCount == 2){
mChannelConversion = 1; // convert to MONO
} else {
mChannelConversion = 2; // Convert to STEREO
}
} else {
mChannelConversion = 0;
}
}
// Fast way to compute 10 * log(value)
M4OSA_Int32 VideoEditorBGAudioProcessing::getDecibelSound(M4OSA_UInt32 value) {
ALOGV("getDecibelSound: %ld", value);
if (value <= 0 || value > 0x8000) {
return 0;
} else if (value > 0x4000) { // 32768
return 90;
} else if (value > 0x2000) { // 16384
return 84;
} else if (value > 0x1000) { // 8192
return 78;
} else if (value > 0x0800) { // 4028
return 72;
} else if (value > 0x0400) { // 2048
return 66;
} else if (value > 0x0200) { // 1024
return 60;
} else if (value > 0x0100) { // 512
return 54;
} else if (value > 0x0080) { // 256
return 48;
} else if (value > 0x0040) { // 128
return 42;
} else if (value > 0x0020) { // 64
return 36;
} else if (value > 0x0010) { // 32
return 30;
} else if (value > 0x0008) { // 16
return 24;
} else if (value > 0x0007) { // 8
return 24;
} else if (value > 0x0003) { // 4
return 18;
} else if (value > 0x0001) { // 2
return 12;
} else { // 1
return 6;
}
}
M4OSA_Bool VideoEditorBGAudioProcessing::isThresholdBreached(
M4OSA_Int32* averageValue,
M4OSA_Int32 storeCount,
M4OSA_Int32 thresholdValue) {
ALOGV("isThresholdBreached");
int totalValue = 0;
for (int i = 0; i < storeCount; ++i) {
totalValue += averageValue[i];
}
return (totalValue / storeCount > thresholdValue);
}
}//namespace android