[pjsip] pjsip confsample does not work

Senthil Raja vsraja at yahoo.com
Tue Apr 8 02:28:17 EDT 2008

Thanks Daniel! 
I guess my file is of type stereo. I downloaded a file from the web with mono type and it worked fine. 
I also tried your suggestion of setting channel as 2, it worked! but the voice quality was very bad.
Now I have to see how I could record a a mono wav file.


----- Original Message ----
From: Daniel Mikusa <dan at mikusa.com>
To: pjsip list <pjsip at lists.pjsip.org>
Sent: Sunday, April 6, 2008 11:52:35 AM
Subject: Re: [pjsip] pjsip confsample does not work

By default the sound files for that example need to be mono.  Yours is stereo.

Try using the -c option to set the number of channels to two.


macbook-pro:samples daniel$ ./confsample-i386-apple-darwin9.2.0 -h
 14:49:44.601 os_core_unix.c pjlib 0.8.0-trunk for POSIX initialized
 14:49:44.602   confsample.c Error: unknown options 'h'

  Demonstrate how to use conference bridge.				    
  confsample [options] [file1.wav] [file2.wav] ...			    
  -d, --dev=NUM        Sound device use device id NUM (default=-1)	 
  -r, --rate=HZ        Set clock rate in samples per sec (default=44100)
  -c, --channel=NUM    Set # of channels (default=1 for mono).		 
  -f, --frame=NUM      Set # of samples per frame (default equival 20ms)
  -b, --bit=NUM        Set # of bits per sample (default=16)		 
  fileN.wav are optional WAV files to be connected to the conference      
  bridge. The WAV files MUST have single channel (mono) and 16 bit PCM    
  samples. It can have arbitrary sampling rate.			    
  Here we create a conference bridge, with at least one port (port zero   
  is always created for the sound device).				    
  If WAV files are specified, the WAV file player ports will be connected 
  to slot starting from number one in the bridge. The WAV files can have  
  arbitrary sampling rate; the bridge will convert it to its clock rate.  
  However, the files MUST have a single audio channel only (i.e. mono).  

On Apr 6, 2008, at 4:28 AM, Senthil Raja wrote:
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I tried to execute "confsample" from the pjsip samples and got the following error (see below). Could some one explain what this error means. FYI, the ininput file "welcome.wav" was created using "recfile" sample.


../pjproject-0.8.0/pjsip-apps/bin/samples/confsample-i686-pc-linux-gnu welcome.wav
 16:42:21.441 os_core_unix.c pjlib 0.8.0 for POSIX initialized
 16:42:21.462      pasound.c PortAudio sound library initialized, status=0
 16:42:21.469      pasound.c PortAudio host api count=1
 16:42:21.485      pasound.c Sound device count=1
 16:42:21.504          pjlib select() I/O Queue created (0x809121c)
 16:42:21.518   conference.c Creating conference bridge with 3 ports
 16:42:21.593      pasound.c Opened device /dev/dsp(OSS)//dev/dsp(OSS) for recording and playback, sample rate=44100, ch=1, bits=16, 882 samples per frame, input latency=23 ms, output latency=23 ms
 16:42:21.599      pasound.c Starting /dev/dsp stream..
 16:42:21.688      pasound.c Recorder thread started
 16:42:21.691 os_core_unix.c Info: possibly re-registering existing thread
 16:42:21.699      pasound.c Player thread started
 16:42:21.706      pasound.c Done, status=0
 16:42:21.708   conference.c Sound device successfully created for port 0
 16:42:21.710   wav_writer.c File writer 'confrecord.wav' created: samp.rate=44100, bufsize=4KB
 16:42:21.718   wav_player.c File player 'welcome.wav' created: samp.rate=44100, ch=2, bufsize=4KB, filesize=1188KB
confsample-i686-pc-linux-gnu: ../src/pjmedia/conference.c:678: pjmedia_conf_add_port: Assertion `!"Number of channels mismatch"' failed.

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