AudioClipWorkflow.cpp 5.67 KB
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/*****************************************************************************
 * AudioClipWorkflow.cpp : Clip workflow. Will extract a single frame from a VLCMedia
 *****************************************************************************
 * Copyright (C) 2008-2009 the VLMC team
 *
 * Authors: Hugo Beauzee-Luyssen <hugo@vlmc.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#include <QtDebug>

#include "AudioClipWorkflow.h"

AudioClipWorkflow::AudioClipWorkflow( Clip* clip ) :
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        ClipWorkflow( clip )
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{
}

AudioClipWorkflow::~AudioClipWorkflow()
{
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    while ( m_availableBuffers.isEmpty() == false )
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        delete m_availableBuffers.dequeue();
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    while ( m_computedBuffers.isEmpty() == false )
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        delete m_computedBuffers.dequeue();
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}

void*       AudioClipWorkflow::getLockCallback()
{
    return reinterpret_cast<void*>(&AudioClipWorkflow::lock);
}

void*       AudioClipWorkflow::getUnlockCallback()
{
    return reinterpret_cast<void*>(&AudioClipWorkflow::unlock);
}

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void*       AudioClipWorkflow::getOutput( ClipWorkflow::GetMode mode )
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{
    QMutexLocker    lock( m_renderLock );
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    QMutexLocker    lock2( m_computedBuffersMutex );
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    preGetOutput();
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//    qWarning() << "Audio. Available:" << m_availableBuffers.count() << "Computed:" << m_computedBuffers.count();
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    if ( isEndReached() == true )
        return NULL;
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    if ( mode == ClipWorkflow::Get )
        qCritical() << "A sound buffer should never be asked with 'Get' mode";
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    StackedBuffer<AudioSample*, AudioClipWorkflow>* buff = new StackedBuffer<AudioSample*, AudioClipWorkflow>( m_computedBuffers.dequeue(), this, true );
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    postGetOutput();
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    return buff;
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}

void        AudioClipWorkflow::initVlcOutput()
{
    m_vlcMedia->addOption( ":no-sout-video" );
    m_vlcMedia->addOption( ":sout=#transcode{}:smem" );
    m_vlcMedia->setAudioDataCtx( this );
    m_vlcMedia->setAudioLockCallback( reinterpret_cast<void*>( getLockCallback() ) );
    m_vlcMedia->setAudioUnlockCallback( reinterpret_cast<void*>( getUnlockCallback() ) );
    m_vlcMedia->addOption( ":sout-transcode-acodec=s16l" );
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    m_vlcMedia->addOption( ":sout-transcode-samplerate=48000" );
    m_vlcMedia->addOption( ":sout-transcode-channels=2" );
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    m_vlcMedia->addOption( ":no-sout-smem-time-sync" );
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}

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AudioClipWorkflow::AudioSample*    AudioClipWorkflow::createBuffer( size_t size )
{
    AudioSample* as = new AudioSample;
    as->buff = new uchar[size];
    as->size = size;
    return as;
}

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void        AudioClipWorkflow::lock( AudioClipWorkflow* cw, uint8_t** pcm_buffer , unsigned int size )
{
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    cw->m_renderLock->lock();
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    cw->m_computedBuffersMutex->lock();
    QMutexLocker    lock( cw->m_availableBuffersMutex );
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    //If there's no buffer at all, it must be the first render
    if ( cw->m_availableBuffers.count() == 0 && cw->m_computedBuffers.count() == 0 )
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    {
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        for ( unsigned int i = 0; i < AudioClipWorkflow::nbBuffers; ++i )
        {
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            AudioSample* as = cw->createBuffer( size );
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            as->debugId = i;
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            cw->m_availableBuffers.push_back( as );
        }
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    }
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//    qWarning() << ">>>AudioGeneration. Available:" << cw->m_availableBuffers.count() << "Computed:" << cw->m_computedBuffers.count();
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    AudioSample* as = NULL;
    if ( cw->m_availableBuffers.isEmpty() == true )
    {
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        qCritical() << cw << "Late buffer generation. Spawning new audio buffer.";
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        as = cw->createBuffer( size );
    }
    else
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        as = cw->m_availableBuffers.dequeue();
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    cw->m_computedBuffers.push_back( as );
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    *pcm_buffer = as->buff;
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}

void        AudioClipWorkflow::unlock( AudioClipWorkflow* cw, uint8_t* pcm_buffer,
                                      unsigned int channels, unsigned int rate,
                                      unsigned int nb_samples, unsigned int bits_per_sample,
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                                      unsigned int size, qint64 pts )
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{
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//    qDebug() << "pts:" << pts << "nb channels" << channels << "rate:" << rate <<
//            "size:" << size << "nb_samples:" << nb_samples;
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    Q_UNUSED( pcm_buffer );
    Q_UNUSED( rate );
    Q_UNUSED( bits_per_sample );
    Q_UNUSED( size );
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    cw->computePtsDiff( pts );
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    AudioSample* as = cw->m_computedBuffers.last();
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//    qWarning() << "Computing audio PTS: pts:" << pts << "m_currentPts:" << cw->m_currentPts << "m_previousPts:" << cw->m_previousPts << "for buffer#" << as->debugId;
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    if ( as->buff != NULL )
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    {
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        as->nbSample = nb_samples;
        as->nbChannels = channels;
        as->ptsDiff = cw->m_currentPts - cw->m_previousPts;
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    }
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    cw->commonUnlock();
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    cw->m_renderLock->unlock();
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    cw->m_computedBuffersMutex->unlock();
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}

uint32_t    AudioClipWorkflow::getComputedBuffers() const
{
    return m_computedBuffers.count();
}
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uint32_t    AudioClipWorkflow::getMaxComputedBuffers() const
{
    return AudioClipWorkflow::nbBuffers;
}
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void        AudioClipWorkflow::releaseBuffer( AudioSample *sample )
{
    QMutexLocker    lock( m_availableBuffersMutex );
    m_availableBuffers.enqueue( sample );
}