diff options
Diffstat (limited to 'examples/mobile/quickhit/ga_src/GEAudioBuffer.cpp')
| -rw-r--r-- | examples/mobile/quickhit/ga_src/GEAudioBuffer.cpp | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/examples/mobile/quickhit/ga_src/GEAudioBuffer.cpp b/examples/mobile/quickhit/ga_src/GEAudioBuffer.cpp new file mode 100644 index 00000000..79addba5 --- /dev/null +++ b/examples/mobile/quickhit/ga_src/GEAudioBuffer.cpp @@ -0,0 +1,392 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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; +}; |