Re: [Discuss-gnuradio] Cannot get Socket-to-blob and blob-to-Socket to work with float values

[Josh Blum]

On 07/10/2012 10:12 AM, Josh Blum wrote:
> 
> 
> On 07/10/2012 09:34 AM, Tommy Tracy wrote:
>> Hello everyone,
>>
>>     I'm doing some work with Josh Blum's extras. Basically, I made the
>> easiest possible message-passing program I could think of.
>>
> 
> Floats have a size of 4 bytes.
> You should set the item size parameter to 4.
> 

I replied too quickly. Take a look at the stream to blob/blob to stream
blocks.

-josh

> -josh
> 
>> Signal Source [sample:44.1k, freq:1k]  ----(float)----> Extras: Blob
>> to Socket[UDP, 127.0.0.1, 12345]
>>
>> Extras: Socket to Blob[UDP, 127.0.0.1, 12345] -----(float)------>Audio
>> Sink[sample:44.1k]
>>
>> When I attempt to run this, I get the following error message:
>>
>>   File "/home/ttracy/Documents/GNURADIO/examples/companion/top_block.py",
>> line 41, in __init__
>>     self.connect((self.gr_sig_source_x_0, 0), (self.extras_blob_to_socket_0, 
>> 0))
>>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
>> line 124, in connect
>>     self._connect(points[i-1], points[i])
>>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
>> line 130, in _connect
>>     dst_block.to_basic_block(), dst_port)
>>   File 
>> "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_runtime.py",
>> line 1836, in primitive_connect
>> Traceback (most recent call last):
>>   File "/home/ttracy/Documents/GNURADIO/examples/companion/top_block.py",
>> line 54, in <module>
>>     return _gnuradio_core_runtime.gr_top_block_sptr_primitive_connect(self,
>> *args)
>> ValueError: itemsize mismatch: sig_source_f(1):0 using 4, blob_to_udp
>> wrapper(6):0 using 1
>>
>> Unfortunately, I have no idea what this stack trace is telling me. Can
>> it not handle Floats as an input?
>>
>> Thanks for the help!
>>
>