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noisesupperssion.cpp
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noisesupperssion.cpp
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#include "noisesupperssion.h"
enum {Mild, Medium, Aggressive};
//_RESAMPLE_
ReSample::ReSample(int inputSamplerate, int outputSamplerate)
: m_inputSample(inputSamplerate)
, m_outputSample(outputSamplerate)
, m_state(NULL)
{
}
void ReSample::init()
{
int err;
m_state = src_new(SRC_SINC_BEST_QUALITY, 2, &err);
if (!m_state)
return;
m_ratio = double(m_outputSample) / double(m_inputSample);
}
QByteArray ReSample::process(const QByteArray &inputData)
{
int inFrame = inputData.size() / 4;
int outFrame = int((double(inFrame) * m_ratio) + 0.5);
static float *inData = new float[44100];
static float *outData = new float[44100];
static short *finalData = new short[44100];
src_short_to_float_array((short*) (inputData.data()), inData, inFrame * 2);
SRC_DATA src_data;
src_data.end_of_input = 0 ;
src_data.data_in = inData ;
src_data.input_frames = inFrame;
src_data.data_out = outData;
src_data.output_frames = outFrame;
src_data.src_ratio = m_ratio ;
src_process (m_state, &src_data);
src_float_to_short_array(outData, finalData, outFrame * 2);
QByteArray outputData = QByteArray((char*)finalData, outFrame * 2 * 2);
return outputData;
}
//_NOISEPROCESS_
void NoiseProcess::init()
{
memset(m_filter_state_1, 0, sizeof(m_filter_state_1));
memset(m_filter_state_2, 0, sizeof(m_filter_state_2));
memset(m_synthesis_state_1, 0, sizeof(m_synthesis_state_1));
memset(m_synthesis_state_2, 0, sizeof(m_synthesis_state_2));
WebRtcNsx_Create(&m_nsx);
WebRtcNsx_Init(m_nsx, 32000);
WebRtcNsx_set_policy(m_nsx, Aggressive);
}
QByteArray NoiseProcess::process(QByteArray &in)
{
static short shBufferIn[320];
static short shInL[160];
static short shInH[160];
static short shOutL[160];
static short shOutH[160];
memcpy(shBufferIn, (char*)in.data(), 320 * sizeof(short));
WebRtcSpl_AnalysisQMF(shBufferIn, 320, shInL, shInH, m_filter_state_1, m_filter_state_2);
if (0 == WebRtcNsx_Process(m_nsx, shInL, shInH, shOutL, shOutH)) {
short shBufferOut[320];
WebRtcSpl_SynthesisQMF(shOutL, shOutH, 160, shBufferOut, m_synthesis_state_1, m_synthesis_state_2);
return QByteArray((char*)shBufferOut, 320 * sizeof(short));
}
}
//_NOISESUPPERSSION_
NoiseSupperssion::NoiseSupperssion()
{
m_44_32 = new ReSample(44100, 32000);
m_32_44 = new ReSample(32000, 44100);
m_44_32->init();
m_32_44->init();
}
void NoiseSupperssion::init()
{
NoiseProcess *handle1 = new NoiseProcess;
NoiseProcess *handle2 = new NoiseProcess;
handle1->init();
handle2->init();
m_handle[0] = handle1;
m_handle[1] = handle2;
}
QByteArray NoiseSupperssion::process(QByteArray &in)
{
m_dataCache.append(in);
if (true) {
int size = m_dataCache.size();
QByteArray inData = m_dataCache.mid(0, size);
QByteArray data32 = m_44_32->process(inData);
m_dataCache_32.append(data32);
m_dataCache.remove(0, size);
}
while (m_dataCache_32.size() >= 1280) {
QByteArray inData = m_dataCache_32.mid(0, 1280);
QByteArray leftData, rightData;
channelSeparate(inData, leftData, rightData);
QByteArray left = m_handle[0]->process(leftData);
QByteArray right = m_handle[1]->process(rightData);
QByteArray mergeData = channelMerge(left, right);
m_dataCache_32_Processed.append(mergeData);
m_dataCache_32.remove(0, 1280);
}
if (true) {
int size = m_dataCache_32_Processed.size();
QByteArray inData = m_dataCache_32_Processed.mid(0, size);
QByteArray data44 = m_32_44->process(inData);
m_dataCache_32_Processed.remove(0, size);
return data44;
}
}
void NoiseSupperssion::channelSeparate(QByteArray &in, QByteArray &left, QByteArray &right)
{
int count = in.size() / sizeof(short);
int samplesPerChannel = count / 2;
static short *leftBytes = new short[44100];
static short *rightBytes = new short[44100];
short *data = (short*)in.data();
int pos = 0;
for (int i = 0; i < count; i += 2) {
leftBytes[pos] = data[i];
rightBytes[pos] = data[i+1];
++pos;
}
left.append((char*)leftBytes, samplesPerChannel*sizeof(short));
right.append((char*)rightBytes, samplesPerChannel*sizeof(short));
}
QByteArray NoiseSupperssion::channelMerge(QByteArray &left, QByteArray &right)
{
short *ldata = (short*)left.data();
short *rdata = (short*)right.data();
QByteArray ret;
int count = left.size() / 2;
for (int i = 0; i < count; ++i) {
short ld = ldata[i];
short rd = rdata[i];
ret.append((char*)&ld, 2);
ret.append((char*)&rd, 2);
}
return ret;
}