> On Fri, Jul 13, 2012 at 12:52 PM, Josh Blum <
address@hidden> wrote:
>
>>
>>
>> On 07/13/2012 08:51 AM, Anisha Gorur wrote:
>>> Hello all,
>>> I've been trying to work with stream tags in python, mainly using the
>>> grextras blocks coding guide
>>> here:
https://github.com/guruofquality/grextras/wiki/Blo...
>>> <
>>
https://github.com/guruofquality/grextras/wiki/Blocks-Coding-Guide#wiki-the-work-function
>>> .
>>>
>>> I've set up a very simple flow graph, just a vector source, throttle and
>>> file sink, and I would like to place a tag on the first element of the
>>> vector that contains time metadata. I'm using this code:
>>>
>>> def work(self, input_items, output_items):
>>> item_index = ? #which output item gets the tag?
>>
>> set item_index to x so the tag gets associated with outputs_items[0][x]
>>
>>> offset = self.nitems_written(0) + item_index
>>> key = pmt.pmt_string_to_symbol("example_key")
>>> value = pmt.pmt_string_to_symbol("example_value")
>>>
>>> #write at tag to output port 0 with given absolute item offset
>>> self.add_item_tag(0, offset, key, value)
>>>
>>> I think the problem has something to do with not implementing the
>>> correct modules. My question is, what are the appropriate modules to
>>> import to read and write stream tags in python?
>>>
>>
>> You might want to look more that that coding guide, at lot of the
>> snippets are just work functions, but many contain full class
>> definitions with import statements. For example:
>>
>> from gnuradio import gr
>> import gnuradio.extras
>>
>> class my_sync_block(gr.block):
>>
>> def __init__(self, args):
>> gr.block.__init__(self, name="my block", in_sig=[numpy.int32],
>> out_sig=[numpy.int32])
>>
>> def work(self, input_items, output_items):
>> #work stuff...
>> return len(output_items[0])
>>
>> -josh
>>
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>>
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>>
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>>
>
>
>