[CLAM] What's wrong with my code

[Stephane THOMAS]

Hi,

On Sun, 14 Dec 2008 19:04:50 +0100
David García Garzón <dgarcia at iua.upf.edu> wrote:

> > Warning: 2 sinks were not fed, so could not send audio to the callback.
> 
> This messages is also painless provided that it is only shown a couple of 
> times. Normally it means that you have to execute the network a couple of 
> times to produce the first output. But if the message displays all the time, 
> then it could be a problem of unfeeded input which seems not likely.

Yes the message is repeated all the time.

> Notice that the connection will fail silently when the file is mono. Check 
> CanConnectPorts before actually connecting them or use CLAM::ConnectPorts 
> instead of CLAM::Network::ConnectPorts so you can get a nice exception. Also 
> the configuration might fail. Whatever the case, the Network has several 
> methods to do the diagnose when it can be played or not.

Yes. I know that. Currently I'm doing all my test with the same audio (wav) file that I know to be a stereo one.

> If the network is sounding but badly, then please, check whether other jack 
> applications work and if they do, check whether provided CLAM examples work 
> with jack (NetworkEditor and the like).

Other audio apps (including NetworkEditor) are running fine with JACK. I wasn't able to build "the like"... (Turnaround, etc...)

> Sorry for not being that helpful.

No problem, I'm happy to get an answer to my newbie questions...
 
> The memory management issue: notice that the network takes ownership of the 
> added processings so you cannot make the processings automatic members of your 
> objects. Anyway that should not cause the problem you were reporting.

I'm not sure to understand. What do you call an "automatic member" ?

Many thanks for your help. I'll try to rewrite my example using the portaudio backend so I can tell if the issue is related to the JACK backend.

Stef
 
> On Dimecres 10 Desembre 2008 18:54:07 Stephane THOMAS wrote:
> > Hi,
> >
> > Here is another program I wrote from scratch (the goal is to get a command
> > line program which plays a stereo file through JACK)
> >
> > It produces sound, but once again, I have a repeated error message and the
> > sound is awful :
> >
> > Warning: 2 sinks were not fed, so could not send audio to the callback.
> >
> > The program is called cjap (for CLAM JACK Audio Player), here is the code :
> >
> > -----------cjap.h--------------
> > #include <QObject>
> > #include "CLAM/Network.hxx"
> > #include "CLAM/AudioSink.hxx"
> > #include "CLAM/MultiChannelAudioFileReader.hxx"
> > #include "CLAM/JACKNetworkPlayer.hxx"
> >
> > using namespace std;
> > using namespace CLAM;
> >
> >
> > class JackAudioFilePlayer : QObject
> > {
> > Q_OBJECT
> >  Network network;
> >  AudioSink sinkL;
> >  AudioSink sinkR;
> >  MultiChannelAudioFileReader reader;
> >  MultiChannelAudioFileReaderConfig config;
> >  JACKNetworkPlayer player;
> >
> > public:
> > JackAudioFilePlayer ();
> > void loadfile (string filename);
> >
> > public slots:
> > void play ();
> > void stop ();
> > };
> > ---------------------------------
> >
> > -------------cjap.cpp------------------
> > #include "cjap.h"
> >
> > JackAudioFilePlayer::JackAudioFilePlayer ()
> > {
> >  network.AddProcessing("left",&sinkL);
> >  network.AddProcessing("right",&sinkR);
> >  network.AddProcessing("reader",&reader);
> > }
> >
> > void JackAudioFilePlayer::loadfile (string filename)
> > {
> >  config.SetSourceFile(filename);
> >  reader.Configure (config);
> >  network.ConnectPorts("reader.Channel #0","left.AudioIn");
> >  network.ConnectPorts("reader.Channel #1","right.AudioIn");
> >  network.SetPlayer (&player);
> > }
> >
> > void JackAudioFilePlayer::play ()
> > {
> >  network.Start();
> > }
> >
> > void JackAudioFilePlayer::stop ()
> > {
> >  network.Stop();
> > }
> > ------------------------------------------
> > ----------main.cpp-----------------------
> > #include <iostream>
> > #include <QCoreApplication>
> > #include "cjap.h"
> >
> > using namespace std;
> >
> >
> > int main (int argc, char** argv)
> > {
> >  QCoreApplication app (argc,argv);
> >
> >  if (argc != 2)
> >   {
> >     cout << "Usage: cjap <filename>" << endl;
> >     return 0;
> >   }
> >  else
> >   {
> >     JackAudioFilePlayer* jafp = new JackAudioFilePlayer;
> >     jafp->loadfile(argv[1]);
> >     jafp->play();
> >   }
> >
> >
> >  return app.exec();
> > }
> > ________________________________________
> >
> > Stef
> >
> > _______________________________________________
> > CLAM mailing list
> > CLAM at iua.upf.es
> > http://clam.iua.upf.edu
>