AudioClipWorkflow.cpp

/*****************************************************************************
 * AudioClipWorkflow.cpp : Clip workflow. Will extract a single frame from a VLCMedia
 *****************************************************************************
 * Copyright (C) 2008-2010 VideoLAN
 *
 * 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"
#include "VLCMedia.h"

AudioClipWorkflow::AudioClipWorkflow( Clip *clip ) :
        ClipWorkflow( clip )
{
    for ( quint32 i = 0; i < AudioClipWorkflow::nbBuffers; ++i )
    {
        AudioSample *as = new AudioSample;
        as->buff = NULL;
        m_availableBuffers.push_back( as );
        as->debugId = i;
    }
    debugType = 1;
}

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

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

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

void*
AudioClipWorkflow::getOutput( ClipWorkflow::GetMode mode )
{
    QMutexLocker    lock( m_renderLock );
    QMutexLocker    lock2( m_computedBuffersMutex );

    if ( preGetOutput() == false )
        return NULL;
    if ( isEndReached() == true )
        return NULL;
    if ( mode == ClipWorkflow::Get )
        qCritical() << "A sound buffer should never be asked with 'Get' mode";
    ::StackedBuffer<AudioSample*> *buff = new StackedBuffer(
            m_computedBuffers.dequeue(), this, true );
    postGetOutput();
    return buff;
}

void
AudioClipWorkflow::initVlcOutput()
{
    m_vlcMedia->addOption( ":no-sout-video" );
    m_vlcMedia->addOption( ":no-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=f32l" );
    m_vlcMedia->addOption( ":sout-transcode-samplerate=48000" );
    m_vlcMedia->addOption( ":sout-transcode-channels=2" );
    if ( m_fullSpeedRender == false )
        m_vlcMedia->addOption( ":sout-smem-time-sync" );
    else
        m_vlcMedia->addOption( ":no-sout-smem-time-sync" );
}

AudioClipWorkflow::AudioSample*
AudioClipWorkflow::createBuffer( size_t size )
{
    AudioSample *as = new AudioSample;
    as->buff = new uchar[size];
    as->size = size;
    as->debugId = -1;
    return as;
}

void
AudioClipWorkflow::lock( AudioClipWorkflow *cw, quint8 **pcm_buffer , quint32 size )
{
    QMutexLocker    lock( cw->m_availableBuffersMutex );
    cw->m_renderLock->lock();
    cw->m_computedBuffersMutex->lock();

    AudioSample     *as = NULL;
    if ( cw->m_availableBuffers.isEmpty() == true )
        as = cw->createBuffer( size );
    else
    {
        as = cw->m_availableBuffers.dequeue();
        if ( as->buff == NULL )
        {
            as->buff = new uchar[size];
            as->size = size;
        }
    }
    cw->m_computedBuffers.enqueue( as );
    *pcm_buffer = as->buff;
}

void
AudioClipWorkflow::unlock( AudioClipWorkflow *cw, quint8 *pcm_buffer,
                                      quint32 channels, quint32 rate,
                                      quint32 nb_samples, quint32 bits_per_sample,
                                      quint32 size, qint64 pts )
{
    Q_UNUSED( pcm_buffer );
    Q_UNUSED( rate );
    Q_UNUSED( bits_per_sample );
    Q_UNUSED( size );

    cw->computePtsDiff( pts );
    AudioSample* as = cw->m_computedBuffers.last();
    if ( as->buff != NULL )
    {
        as->nbSample = nb_samples;
        as->nbChannels = channels;
        as->ptsDiff = cw->m_currentPts - cw->m_previousPts;
    }
    cw->commonUnlock();
    cw->m_renderLock->unlock();
    cw->m_computedBuffersMutex->unlock();
}

quint32
AudioClipWorkflow::getNbComputedBuffers() const
{
    return m_computedBuffers.count();
}

quint32
AudioClipWorkflow::getMaxComputedBuffers() const
{
    return AudioClipWorkflow::nbBuffers;
}

void
AudioClipWorkflow::releaseBuffer( AudioSample *sample )
{
    QMutexLocker    lock( m_availableBuffersMutex );
    m_availableBuffers.enqueue( sample );
}

void
AudioClipWorkflow::flushComputedBuffers()
{
    QMutexLocker    lock( m_availableBuffersMutex );
    QMutexLocker    lock2( m_computedBuffersMutex );

    while ( m_computedBuffers.isEmpty() == false )
    {
        m_availableBuffers.enqueue( m_computedBuffers.dequeue() );
    }
}

AudioClipWorkflow::StackedBuffer::StackedBuffer( AudioClipWorkflow::AudioSample *as,
                                                AudioClipWorkflow *poolHandler,
                                                bool mustBeReleased) :
    ::StackedBuffer<AudioClipWorkflow::AudioSample*>( as, mustBeReleased ),
    m_poolHandler( poolHandler )
{
}

void
AudioClipWorkflow::StackedBuffer::release()
{
    if ( m_mustRelease == true && m_poolHandler.isNull() == false )
        m_poolHandler->releaseBuffer( m_buff );
    delete this;
}