[Live-devel] FrameSource:Getnextframe error while streaming PCMframes

[Krishna]

Hi Ross,

I found the problem that uLawFromPCMAudioSource  afterGettingFrame is not getting called when I use DeviceSource based design and triggering concept.
i.e. 
If I am calling FramedSource::afterGetting(this) in doGetNextFrame itself , it is calling afterGettingFrame  function in uLawFromPCMAudioSource   followed by calling afterGettingFrame   function in MultiFramedRTPSink.

If I am calling FramedSource::afterGetting(this) in deliverFrame(which will called by trigger event), then it is calling only afterGettingFrame   function in MultiFramedRTPSink and not uLawFromPCMAudioSource   afterGettingFrame  function.
That's why I am getting FramedSource ::getNextFrame():attempting to read more than once at the same time. 

Where I am going wrong?
Can you please help on that?

Thanks in advance

From: Krishna 
Sent: Friday, October 11, 2013 12:40 PM
To: live-devel at ns.live555.com 
Subject: [Live-devel] FrameSource:Getnextframe error while streaming PCMframes

Hi Ross,

I have problems streaming live PCM audio. Audio comes either directly from microphone (16-bit LE) 
Sampling frequency is 8k, mono(1 channel). 
I  receive a buffer in the thread and use event trigger to signal my live555 thread.

I've created class based on DeviceSource that inherit from AudioInputDevice and delivers the Frame on trigger.
I am using uLawFromPCMAudioSource to convert to 8-bit u-law audio

I am getting following error if I am giving audio format as WA_PCM:
FramedSource ::getNextFrame():attempting to read more than once at the same time. 
One thing I observed here is FramedSource::getNextFrame is getting called twice at a time( uLawFromPCMAudioSource  is calling it again)

If I change audio format to WA_PCMU, I am able to stream without any error ( As FramedSource::getNextFrame  is getting called once at a time), and VLC also able to play with some noise.

Where I am going wrong ? 

Thanks in advance

Regards,
Krishna





 


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