[Discuss-gnuradio] d_itemsize error

[Tarun Tiwari]

Hi Friends,

I am recieving d_itemsize error in random when I use voice reception
using voice_rx.py example. I am receiveing following errors:

terminate called after throwing an instance of 'std::runtime_error'
  wht(): msg length is not a multiple of d_itemsise
Aborted

Also when I start the application I receive following warning:

gr_buffer::allocate_buffer: warning: tried to allocate
   992 items of size 33. Due to alignment requirements
   4096 were allocated.  If this isn't OK, consider padding
   your structure to a power-of-two bytes.
   On this platform, our allocation granularity is 4096 bytes.

What I understant is that, the received message after decoding does not
match the length of the buffer. If I am right, can somebody tell me
where can I find the lenght of the decoded message and the length of
buffer so that I would be in a position to work on the problem. And, if
I am wrong can somebody enlighten me about the cause of this problem
and why is this random?

When I dig into the code, following catches my eyes:

self.packet_src = gr.message_source(33)
...
packet_sink = gr.message_sink(33, self.packets_from_encoder, False)

What does this 33 stand for? If I change the value (say it 32 = power-of-two) it doesnt work ;;)

It would be great if somebody can refer me something on the buffer allocation for gsm_full_rate encoder and decoder. 

Thanks in advance.

Tarun