NetworkPlayer.hxx

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/*
 * Copyright (c) 2001-2007 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef NetworkPlayer_hxx
#define NetworkPlayer_hxx

#include "Network.hxx"
#include "AudioSource.hxx"
#include "AudioSink.hxx"

namespace CLAM
{

class NetworkPlayer
{
protected:
        enum Status { Playing=0, Stopped=1, Paused=2 };

public:
        NetworkPlayer()
                : _network(NULL)
                , _status(Stopped)
        {
        }

        virtual ~NetworkPlayer()
        {
        }

        virtual bool IsWorking() = 0;

        virtual std::string NonWorkingReason() = 0;

        virtual void Init() {}

        virtual void Start()=0; // { if (not IsPlaying()) BePlaying(); }

        virtual void Stop()=0; // { if (not IsStopped()) BeStopped(); }

        virtual void Pause() { if (IsPlaying()) BePaused(); }

        void SetNetworkBackLink( Network& net )
        {
                _network=&net;
        }

        void BePaused() { _status=Paused; }
        void BeStopped() { _status=Stopped; }
        void BePlaying() { _status=Playing; }
        bool IsPaused() const { return _status==Paused; }
        bool IsStopped() const { return _status==Stopped; }
        bool IsPlaying() const { return _status==Playing; }
        virtual bool IsRealTime() const = 0;

        virtual unsigned BackendBufferSize()
        {
                return 512;
        }

        virtual unsigned BackendSampleRate()
        {
                return 44100;
        }

        std::string SourcesAndSinksToString();

protected:
        Network& GetNetwork()
        {
                CLAM_ASSERT( (_network!=NULL), "NetworkPlayer::GetNetwork() : NetworkPlayer does not have any Network");
                return *_network;
        }
protected:
        unsigned GetNSinks() const { return _exportedSinks.size(); }                   
        unsigned GetNSources() const { return _exportedSources.size(); }               
        void CacheSourcesAndSinks()
        {
                _exportedSources.clear();
                Network::Processings sources = GetSources();
                for (Network::Processings::const_iterator it = sources.begin(); it != sources.end(); ++it)
                {
                        Processing * processing = *it;
                        std::string processingName = _network->GetNetworkId(processing);
                        unsigned nPorts = processing->GetNOutPorts();
                        for (unsigned i=0; i<nPorts; i++)
                        {
                                std::ostringstream portName;
                                portName << processingName;
                                if (nPorts > 1)
                                        portName << "_" << processing->GetOutPort(i).GetName();
                                _exportedSources.push_back(ExportedPort(processing,i, portName.str()));
                        }
                }
                _exportedSinks.clear();
                Network::Processings sinks = GetSinks();
                for (Network::Processings::const_iterator it = sinks.begin(); it != sinks.end(); ++it)
                {
                        Processing * processing = *it;
                        std::string processingName = _network->GetNetworkId(processing);
                        unsigned nPorts = processing->GetNInPorts();
                        for (unsigned i=0; i<nPorts; i++)
                        {
                                std::ostringstream portName;
                                portName << processingName;
                                if (nPorts > 1)
                                        portName << "_" << processing->GetInPort(i).GetName();
                                _exportedSinks.push_back(ExportedPort(processing,i, portName.str()));
                        }
                }
        }
        const std::string & SourceName(unsigned source) const
        {
                return _exportedSources[source].name;
        }
        const std::string & SinkName(unsigned sink) const
        {
                return _exportedSinks[sink].name;
        }
        void SetSourceBuffer(unsigned source, const float * data, unsigned nframes);
        void SetSinkBuffer(unsigned sink, float * data, unsigned nframes);
        void SetSinkFrameSize(unsigned sink, unsigned frameSize);
        void SetSourceFrameSize(unsigned source, unsigned frameSize);
private:
        Network::Processings GetSources()
        {
                return GetNetwork().getOrderedProcessingsByAttribute("port_source_type");
        }

        Network::Processings GetSinks()
        {
                return GetNetwork().getOrderedProcessingsByAttribute("port_sink_type");
        }
        template <typename ProcessingType>
        void SetFrameAndHopSizeIf(Processing * proc, unsigned bufferSize, unsigned port)
        {
                if(typeid(*proc)!=typeid(ProcessingType)) return;
                ((ProcessingType*)proc)->SetFrameAndHopSize(bufferSize, port);
                
        }
        template <typename ProcessingType>
        void SetExternalBuffer(Processing * proc, const float * data, unsigned nframes, unsigned port)
        {
                if(typeid(*proc)!=typeid(ProcessingType)) return;
                ((ProcessingType*)proc)->SetExternalBuffer(data, nframes, port);
        }
        template <typename ProcessingType>
        void SetExternalBuffer(Processing * proc, float * data, unsigned nframes, unsigned port)
        {
                if(typeid(*proc)!=typeid(ProcessingType)) return;
                ((ProcessingType*)proc)->SetExternalBuffer(data, nframes, port);
        }

private:
        struct ExportedPort
        {
                ExportedPort(Processing * aProcesing, unsigned aPort, const std::string & aName)
                        : processing(aProcesing)
                        , port(aPort)
                        , name(aName)
                {
                }
                Processing * processing;
                unsigned port;
                std::string name;
        };
        typedef std::vector <ExportedPort> ExportedPorts;
        ExportedPorts _exportedSources;
        ExportedPorts _exportedSinks;
        Network *_network;
        volatile Status _status;
};

} //namespace CLAM

#endif // NetworkPlayer_hxx