GEAudioBuffer.cpp Example File
demos/mobile/quickhit/ga_src/GEAudioBuffer.cpp
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#include <QDebug>
#include <math.h>
#include "GEAudioBuffer.h"
using namespace GE;
struct SWavHeader {
char chunkID[4];
unsigned int chunkSize;
char format[4];
unsigned char subchunk1id[4];
unsigned int subchunk1size;
unsigned short audioFormat;
unsigned short nofChannels;
unsigned int sampleRate;
unsigned int byteRate;
unsigned short blockAlign;
unsigned short bitsPerSample;
unsigned char subchunk2id[4];
unsigned int subchunk2size;
};
CAudioBuffer::CAudioBuffer() {
m_data = 0;
m_dataLength = 0;
m_sampleFunction = 0;
};
CAudioBuffer::~CAudioBuffer() {
reallocate(0);
}
void CAudioBuffer::reallocate( int length ) {
if (m_data) delete [] ((char*)m_data);
m_dataLength = length;
if (m_dataLength>0) {
m_data = new char[ m_dataLength ];
} else m_data = 0;
};
CAudioBuffer* CAudioBuffer::loadWav( QString fileName ) {
QFile *wavFile = new QFile( fileName );
if (wavFile->open(QIODevice::ReadOnly)) {
SWavHeader header;
wavFile->read( header.chunkID, 4 );
if (header.chunkID[0]!='R' || header.chunkID[1]!='I' || header.chunkID[2]!='F' || header.chunkID[3]!='F') return 0; // incorrect header
wavFile->read( (char*)&header.chunkSize,4 );
wavFile->read( (char*)&header.format,4 );
if (header.format[0]!='W' || header.format[1]!='A' || header.format[2]!='V' || header.format[3]!='E') return 0; // incorrect header
wavFile->read( (char*)&header.subchunk1id,4 );
if (header.subchunk1id[0]!='f' || header.subchunk1id[1]!='m' || header.subchunk1id[2]!='t' || header.subchunk1id[3]!=' ') return 0; // incorrect header
wavFile->read( (char*)&header.subchunk1size,4 );
wavFile->read( (char*)&header.audioFormat,2 );
wavFile->read( (char*)&header.nofChannels,2 );
wavFile->read( (char*)&header.sampleRate,4 );
wavFile->read( (char*)&header.byteRate,4 );
wavFile->read( (char*)&header.blockAlign,2 );
wavFile->read( (char*)&header.bitsPerSample,2 );
qDebug() << fileName << " opened";
while (1) {
if (wavFile->read( (char*)&header.subchunk2id,4 ) != 4) return 0;
if (wavFile->read( (char*)&header.subchunk2size,4 ) != 4) return 0;
//int deb_size = header.subchunk2size;
//char tes[4];
//memcpy(tes, header.subchunk2id, 4 );
//if (header.subchunk2id[0]!='d' || header.subchunk2id[1]!='a' || header.subchunk2id[2]!='t' || header.subchunk2id[3]!='a') return 0; // incorrect header
if (header.subchunk2id[0]=='d' && header.subchunk2id[1]=='a' && header.subchunk2id[2]=='t' && header.subchunk2id[3]=='a') break; // found the data, chunk
// this was not the data-chunk. skip it
if (header.subchunk2size<1) return 0; // error in file
char *unused = new char[header.subchunk2size];
wavFile->read( unused, header.subchunk2size );
delete [] unused;
}
// the data follows.
if (header.subchunk2size<1) return 0;
CAudioBuffer *rval = new CAudioBuffer;
rval->m_nofChannels = header.nofChannels;
rval->m_bitsPerSample = header.bitsPerSample;
rval->m_samplesPerSec = header.sampleRate;
rval->m_signedData = 0; // where to know this?
rval->reallocate( header.subchunk2size );
wavFile->read( (char*)rval->m_data, header.subchunk2size );
// choose a good sampling function.
rval->m_sampleFunction = 0;
if (rval->m_nofChannels==1) {
if (rval->m_bitsPerSample == 8) rval->m_sampleFunction = sampleFunction8bitMono;
if (rval->m_bitsPerSample == 16) rval->m_sampleFunction = sampleFunction16bitMono;
} else {
if (rval->m_bitsPerSample == 8) rval->m_sampleFunction = sampleFunction8bitStereo;
if (rval->m_bitsPerSample == 16) rval->m_sampleFunction = sampleFunction16bitStereo;
}
return rval;
} else {
qDebug() << fileName << " NOT opened";
return 0;
}
delete wavFile;
};
CAudioBuffer* CAudioBuffer::loadWav( FILE *wavFile ) {
// read the header.
SWavHeader header;
fread( header.chunkID, 4, 1, wavFile );
if (header.chunkID[0]!='R' || header.chunkID[1]!='I' || header.chunkID[2]!='F' || header.chunkID[3]!='F') return 0; // incorrect header
fread( &header.chunkSize, 4, 1, wavFile );
fread( header.format, 4, 1, wavFile );
if (header.format[0]!='W' || header.format[1]!='A' || header.format[2]!='V' || header.format[3]!='E') return 0; // incorrect header
fread( header.subchunk1id, 4, 1, wavFile );
if (header.subchunk1id[0]!='f' || header.subchunk1id[1]!='m' || header.subchunk1id[2]!='t' || header.subchunk1id[3]!=' ') return 0; // incorrect header
fread( &header.subchunk1size, 4, 1, wavFile );
fread( &header.audioFormat, 2, 1, wavFile );
fread( &header.nofChannels, 2, 1, wavFile );
fread( &header.sampleRate, 4, 1, wavFile );
fread( &header.byteRate, 4, 1, wavFile );
fread( &header.blockAlign, 2, 1, wavFile );
fread( &header.bitsPerSample, 2, 1, wavFile );
fread( header.subchunk2id, 4, 1, wavFile );
if (header.subchunk2id[0]!='d' || header.subchunk2id[1]!='a' || header.subchunk2id[2]!='t' || header.subchunk2id[3]!='a') return 0; // incorrect header
fread( &header.subchunk2size, 4, 1, wavFile );
// the data follows.
if (header.subchunk2size<1) return 0;
CAudioBuffer *rval = new CAudioBuffer;
rval->m_nofChannels = header.nofChannels;
rval->m_bitsPerSample = header.bitsPerSample;
rval->m_samplesPerSec = header.sampleRate;
rval->m_signedData = 0; // where to know this?
rval->reallocate( header.subchunk2size );
fread( rval->m_data, 1, header.subchunk2size, wavFile );
// choose a good sampling function.
rval->m_sampleFunction = 0;
if (rval->m_nofChannels==1) {
if (rval->m_bitsPerSample == 8) rval->m_sampleFunction = sampleFunction8bitMono;
if (rval->m_bitsPerSample == 16) rval->m_sampleFunction = sampleFunction16bitMono;
} else {
if (rval->m_bitsPerSample == 8) rval->m_sampleFunction = sampleFunction8bitStereo;
if (rval->m_bitsPerSample == 16) rval->m_sampleFunction = sampleFunction16bitStereo;
}
return rval;
};
AUDIO_SAMPLE_TYPE CAudioBuffer::sampleFunction8bitMono( CAudioBuffer *abuffer, int pos, int channel ) {
return (AUDIO_SAMPLE_TYPE)(((unsigned char*)(abuffer->m_data))[pos]-128)<<8;
};
AUDIO_SAMPLE_TYPE CAudioBuffer::sampleFunction16bitMono( CAudioBuffer *abuffer, int pos, int channel ) {
return (AUDIO_SAMPLE_TYPE)(((short*)(abuffer->m_data))[pos]);
};
AUDIO_SAMPLE_TYPE CAudioBuffer::sampleFunction8bitStereo( CAudioBuffer *abuffer, int pos, int channel ) {
return ((AUDIO_SAMPLE_TYPE)(((char*)(abuffer->m_data))[pos*abuffer->m_nofChannels + channel])<<8);
};
AUDIO_SAMPLE_TYPE CAudioBuffer::sampleFunction16bitStereo( CAudioBuffer *abuffer, int pos, int channel ) {
return (AUDIO_SAMPLE_TYPE)(((short*)(abuffer->m_data))[pos*abuffer->m_nofChannels + channel]);
};
CAudioBufferPlayInstance *CAudioBuffer::playWithMixer( CAudioMixer &mixer ) {
CAudioBufferPlayInstance *i = (CAudioBufferPlayInstance*)mixer.addAudioSource( new CAudioBufferPlayInstance( this ));
return i;
};
CAudioBufferPlayInstance::CAudioBufferPlayInstance() {
m_fixedPos = 0;
m_fixedInc = 0;
m_buffer = 0;
m_fixedLeftVolume = 4096;
m_fixedRightVolume = 4096;
m_destroyWhenFinished = true;
m_finished = false;
};
CAudioBufferPlayInstance::CAudioBufferPlayInstance( CAudioBuffer *startPlaying ) {
m_fixedPos = 0;
m_fixedInc = 0;
m_fixedLeftVolume = 4096;
m_fixedRightVolume = 4096;
m_destroyWhenFinished = true;
m_finished = false;
playBuffer( startPlaying, 1.0f, 1.0f );
};
void CAudioBufferPlayInstance::playBuffer( CAudioBuffer *startPlaying, float volume, float speed, int loopTimes ) {
m_buffer = startPlaying;
m_fixedLeftVolume = (int)(4096.0f*volume);
m_fixedRightVolume = m_fixedLeftVolume;
m_fixedPos = 0;
//m_fixedInc = ( startPlaying->getSamplesPerSec() * (int)(4096.0f*speed)) / AUDIO_FREQUENCY;
setSpeed( speed );
m_loopTimes = loopTimes;
};
CAudioBufferPlayInstance::~CAudioBufferPlayInstance() {
};
void CAudioBufferPlayInstance::stop() {
m_buffer = 0;
m_finished = true;
};
void CAudioBufferPlayInstance::setSpeed( float speed ) {
if (!m_buffer) return;
m_fixedInc = (int)( ((float)m_buffer->getSamplesPerSec() * 4096.0f*speed) / (float)AUDIO_FREQUENCY );
};
void CAudioBufferPlayInstance::setLeftVolume( float vol ) {
m_fixedLeftVolume = (int)(4096.0f*vol);
};
void CAudioBufferPlayInstance::setRightVolume( float vol ) {
m_fixedRightVolume = (int)(4096.0f*vol);
};
bool CAudioBufferPlayInstance::canBeDestroyed() {
if (m_finished==true &&
m_destroyWhenFinished==true) return true; else return false;
};
// Does not do any bound-checking. Must be checked before called.
int CAudioBufferPlayInstance::mixBlock( AUDIO_SAMPLE_TYPE *target, int samplesToMix ) {
SAMPLE_FUNCTION_TYPE sampleFunction = m_buffer->getSampleFunction();
if (!sampleFunction) return 0; // unsupported sampletype
AUDIO_SAMPLE_TYPE *t_target = target+samplesToMix*2;
int sourcepos;
//int tempCounter = 0;
if (m_buffer->getNofChannels() == 2) { // stereo
while (target!=t_target) {
sourcepos = m_fixedPos>>12;
target[0] = (((((sampleFunction)( m_buffer, sourcepos, 0) * (4096-(m_fixedPos&4095)) + (sampleFunction)( m_buffer, sourcepos+1, 0) * (m_fixedPos&4095) ) >> 12) * m_fixedLeftVolume) >> 12);
target[1] = (((((sampleFunction)( m_buffer, sourcepos, 1) * (4096-(m_fixedPos&4095)) + (sampleFunction)( m_buffer, sourcepos+1, 1) * (m_fixedPos&4095) ) >> 12) * m_fixedRightVolume) >> 12);
m_fixedPos+=m_fixedInc;
target+=2;
//tempCounter++;
};
} else { // mono
int temp;
while (target!=t_target) {
sourcepos = m_fixedPos>>12;
temp = (((sampleFunction)( m_buffer, sourcepos, 0 ) * (4096-(m_fixedPos&4095)) + (sampleFunction)( m_buffer, sourcepos+1, 0 ) * (m_fixedPos&4095) ) >> 12);
target[0] = ((temp*m_fixedLeftVolume)>>12);
target[1] = ((temp*m_fixedRightVolume)>>12);
m_fixedPos+=m_fixedInc;
target+=2;
//tempCounter++;
};
};
return samplesToMix;
};
int CAudioBufferPlayInstance::pullAudio( AUDIO_SAMPLE_TYPE *target, int bufferLength ) {
if (!m_buffer) return 0; // no sample associated to mix..
int channelLength = ((m_buffer->getDataLength()) / (m_buffer->getNofChannels()*m_buffer->getBytesPerSample()))-2;
int samplesToWrite = bufferLength/2;
int amount;
int totalMixed = 0;
while (samplesToWrite>0) {
int samplesLeft = channelLength - (m_fixedPos>>12);
int maxMixAmount = (int)(((long long int)(samplesLeft)<<12) / m_fixedInc ); // This is how much we can mix at least
//int maxMixAmount = (int)((float)samplesLeft / ((float)m_fixedInc/4096.0f));
//if (maxMixAmount<1) maxMixAmount = 1; // NOTE, THIS MIGHT CAUSE PROBLEMS. NEEDS CHECKING
if (maxMixAmount>samplesToWrite) {
maxMixAmount=samplesToWrite;
}
if (maxMixAmount > 0) {
amount=mixBlock(target+totalMixed * 2, maxMixAmount);
if (amount == 0)
{
// Error!
break;
}
totalMixed+=amount;
} else {
amount = 0;
m_fixedPos = channelLength<<12;
}
// sample is ended,.. check the looping variables and see what to do.
if ((m_fixedPos>>12)>=channelLength) {
m_fixedPos -= (channelLength<<12);
if (m_loopTimes>0) m_loopTimes--;
if (m_loopTimes==0) {
stop();
return totalMixed;
}
}
samplesToWrite-=amount;
if (samplesToWrite<1) break;
};
return totalMixed*2;
};
