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/* $Id: Mp3Encoder.cpp,v 1.13 2003/10/08 15:00:20 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://beos.titer.org/handbrake/>.
It may be used under the terms of the GNU General Public License. */
#include "Mp3Encoder.h"
#include "Manager.h"
#include "Fifo.h"
#include <lame/lame.h>
HBMp3Encoder::HBMp3Encoder( HBManager * manager, HBAudio * audio )
{
fManager = manager;
fAudio = audio;
fLock = new HBLock();
fUsed = false;
fRawBuffer = NULL;
fPosInBuffer = 0;
fSamplesNb = 0;
fLeftSamples = NULL;
fRightSamples = NULL;
fPosition = 0;
fInitDone = false;
fMp3Buffer = NULL;
}
bool HBMp3Encoder::Work()
{
if( !Lock() )
{
return false;
}
if( !fInitDone )
{
/* Wait for a first buffer so we know fAudio->fInSampleRate
is correct */
if( !fAudio->fRawFifo->Size() )
{
Unlock();
return false;
}
/* The idea is to have exactly one mp3 frame (i.e. 1152 samples) by
output buffer. As we are resampling from fInSampleRate to
fOutSampleRate, we will give ( 1152 * fInSampleRate ) /
( 2 * fOutSampleRate ) to libmp3lame so we are sure we will
never get more than 1 frame at a time */
fCount = ( 1152 * fAudio->fInSampleRate ) /
( 2 * fAudio->fOutSampleRate );
/* Init libmp3lame */
fGlobalFlags = lame_init();
lame_set_in_samplerate( fGlobalFlags, fAudio->fInSampleRate );
lame_set_out_samplerate( fGlobalFlags, fAudio->fOutSampleRate );
lame_set_brate( fGlobalFlags, fAudio->fOutBitrate );
if( lame_init_params( fGlobalFlags ) == -1 )
{
Log( "HBMp3Encoder: lame_init_params() failed" );
fManager->Error( HB_ERROR_MP3_INIT );
return false;
}
fLeftSamples = (float*) malloc( fCount * sizeof( float ) );
fRightSamples = (float*) malloc( fCount * sizeof( float ) );
fInitDone = true;
}
bool didSomething = false;
for( ;; )
{
if( fMp3Buffer )
{
if( fAudio->fMp3Fifo->Push( fMp3Buffer ) )
{
fMp3Buffer = NULL;
}
else
{
break;
}
}
/* Get new samples */
if( !GetSamples() )
{
break;
}
int ret;
fMp3Buffer = new HBBuffer( LAME_MAXMP3BUFFER );
ret = lame_encode_buffer_float( fGlobalFlags, fLeftSamples,
fRightSamples, fCount,
fMp3Buffer->fData,
fMp3Buffer->fSize );
if( ret < 0 )
{
/* Something wrong happened */
Log( "HBMp3Encoder : lame_encode_buffer_float() failed "
"(%d)", ret );
fManager->Error( HB_ERROR_MP3_ENCODE );
return false;
}
else if( ret > 0 )
{
/* We got something, send it to the muxer */
fMp3Buffer->fSize = ret;
fMp3Buffer->fKeyFrame = true;
fMp3Buffer->fPosition = fPosition;
}
else
{
delete fMp3Buffer;
fMp3Buffer = NULL;
}
fSamplesNb = 0;
didSomething = true;
}
Unlock();
return didSomething;
}
bool HBMp3Encoder::Lock()
{
fLock->Lock();
if( fUsed )
{
fLock->Unlock();
return false;
}
fUsed = true;
fLock->Unlock();
return true;
}
void HBMp3Encoder::Unlock()
{
fLock->Lock();
fUsed = false;
fLock->Unlock();
}
bool HBMp3Encoder::GetSamples()
{
while( fSamplesNb < fCount )
{
if( !fRawBuffer )
{
if( !( fRawBuffer = fAudio->fRawFifo->Pop() ) )
{
return false;
}
fPosInBuffer = 0;
fPosition = fRawBuffer->fPosition;
}
int willCopy = MIN( fCount - fSamplesNb, 6 * 256 - fPosInBuffer );
memcpy( fLeftSamples + fSamplesNb,
(float*) fRawBuffer->fData + fPosInBuffer,
willCopy * sizeof( float ) );
memcpy( fRightSamples + fSamplesNb,
(float*) fRawBuffer->fData + 6 * 256 + fPosInBuffer,
willCopy * sizeof( float ) );
fSamplesNb += willCopy;
fPosInBuffer += willCopy;
if( fPosInBuffer == 6 * 256 )
{
delete fRawBuffer;
fRawBuffer = NULL;
}
}
return true;
}
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