gr_packed_to_unpacked_bb Class Reference
[Signal Processing Blocks]

#include <gr_packed_to_unpacked_bb.h>

Inheritance diagram for gr_packed_to_unpacked_bb:

gr_block List of all members.

Detailed Description

Convert a stream of packed bytes to stream of unpacked bytes.

input: stream of bytes; output: stream of bytes.

This is the inverse of gr_unpacked_to_packed_bb.

The bits in the byte input stream are grouped into chunks of bits_per_chunk bits and each resulting chunk is written right- justified to the output stream of bytes. All 8 bits of the each input byte is processed. The right thing is done if bits_per_chunk is not a power of two.

The combination of gr_packed_to_unpacked_bb followed by gr_chunks_to_symbols_bf or gr_chunks_to_symbols_bc handles the general case of mapping from a stream of bytes into arbitrary float or complex symbols.

See also:
gr_packed_to_unpacked_bb, gr_unpacked_to_packed_bb,

gr_chunks_to_symbols_bf, gr_chunks_to_symbols_bc.


Public Member Functions

void forecast (int noutput_items, gr_vector_int &ninput_items_required)
 Estimate input requirements given output request.
int general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
 compute output items from input items

Friends

gr_packed_to_unpacked_bb_sptr gr_make_packed_to_unpacked_bb (unsigned int bits_per_chunk, gr_endianness_t endianness)


Member Function Documentation

void gr_packed_to_unpacked_bb::forecast ( int  noutput_items,
gr_vector_int ninput_items_required 
) [virtual]

Estimate input requirements given output request.

Parameters:
noutput_items number of output items to produce
ninput_items_required number of input items required on each input stream
Given a request to product noutput_items, estimate the number of data items required on each input stream. The estimate doesn't have to be exact, but should be close.

Reimplemented from gr_block.

int gr_packed_to_unpacked_bb::general_work ( int  noutput_items,
gr_vector_int ninput_items,
gr_vector_const_void_star input_items,
gr_vector_void_star output_items 
) [virtual]

compute output items from input items

Parameters:
noutput_items number of output items to write on each output stream
ninput_items number of input items available on each input stream
input_items vector of pointers to the input items, one entry per input stream
output_items vector of pointers to the output items, one entry per output stream
Returns:
number of items actually written to each output stream, or -1 on EOF. It is OK to return a value less than noutput_items. -1 <= return value <= noutput_items
general_work must call consume or consume_each to indicate how many items were consumed on each input stream.

Implements gr_block.


Friends And Related Function Documentation

gr_packed_to_unpacked_bb_sptr gr_make_packed_to_unpacked_bb ( unsigned int  bits_per_chunk,
gr_endianness_t  endianness 
) [friend]


The documentation for this class was generated from the following files:
Generated on Mon Sep 18 14:57:49 2006 for GNU Radio 2.x by  doxygen 1.4.7