Public Member Functions |
int | work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
| just like gr_block::general_work, only this arranges to call consume_each for you
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void | forecast (int noutput_items, gr_vector_int &ninput_items_required) |
| Estimate input requirements given output request.
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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
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int | fixed_rate_ninput_to_noutput (int ninput) |
| Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.
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int | fixed_rate_noutput_to_ninput (int noutput) |
| Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this.
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virtual | ~gr_block () |
unsigned | history () const |
void | set_history (unsigned history) |
bool | fixed_rate () const |
| Return true if this block has a fixed input to output rate.
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virtual bool | start () |
| Called to enable drivers, etc for i/o devices.
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virtual bool | stop () |
| Called to disable drivers, etc for i/o devices.
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void | set_output_multiple (int multiple) |
| Constrain the noutput_items argument passed to forecast and general_work.
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int | output_multiple () const |
bool | output_multiple_set () const |
void | set_alignment (int multiple) |
| Constrains buffers to work on a set item alignment (for SIMD)
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int | alignment () const |
void | set_unaligned (int na) |
int | unaligned () const |
void | set_is_unaligned (bool u) |
bool | is_unaligned () const |
void | consume (int which_input, int how_many_items) |
| Tell the scheduler how_many_items of input stream which_input were consumed.
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void | consume_each (int how_many_items) |
| Tell the scheduler how_many_items were consumed on each input stream.
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void | produce (int which_output, int how_many_items) |
| Tell the scheduler how_many_items were produced on output stream which_output .
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void | set_relative_rate (double relative_rate) |
| Set the approximate output rate / input rate.
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double | relative_rate () const |
| return the approximate output rate / input rate
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uint64_t | nitems_read (unsigned int which_input) |
| Return the number of items read on input stream which_input.
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uint64_t | nitems_written (unsigned int which_output) |
| Return the number of items written on output stream which_output.
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tag_propagation_policy_t | tag_propagation_policy () |
| Asks for the policy used by the scheduler to moved tags downstream.
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void | set_tag_propagation_policy (tag_propagation_policy_t p) |
| Set the policy by the scheduler to determine how tags are moved downstream.
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int | max_noutput_items () |
| Return the maximum number of output items this block will handle during a call to work.
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void | set_max_noutput_items (int m) |
| Set the maximum number of ouput items htis block will handle during a call to work.
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void | unset_max_noutput_items () |
| Clear the switch for using the max_noutput_items value of this block.
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bool | is_set_max_noutput_items () |
| Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work.
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void | expand_minmax_buffer (int port) |
long | max_output_buffer (size_t i) |
| Returns max buffer size on output port i .
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void | set_max_output_buffer (long max_output_buffer) |
| Sets max buffer size on all output ports.
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void | set_max_output_buffer (int port, long max_output_buffer) |
| Sets max buffer size on output port port .
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long | min_output_buffer (size_t i) |
| Returns min buffer size on output port i .
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void | set_min_output_buffer (long min_output_buffer) |
| Sets min buffer size on all output ports.
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void | set_min_output_buffer (int port, long min_output_buffer) |
| Sets min buffer size on output port port .
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gr_block_detail_sptr | detail () const |
void | set_detail (gr_block_detail_sptr detail) |
virtual | ~gr_basic_block () |
long | unique_id () const |
long | symbolic_id () const |
std::string | name () const |
std::string | symbol_name () const |
gr_io_signature_sptr | input_signature () const |
gr_io_signature_sptr | output_signature () const |
gr_basic_block_sptr | to_basic_block () |
bool | alias_set () |
std::string | alias () |
pmt::pmt_t | alias_pmt () |
void | set_block_alias (std::string name) |
void | message_port_register_in (pmt::pmt_t port_id) |
void | message_port_register_out (pmt::pmt_t port_id) |
void | message_port_pub (pmt::pmt_t port_id, pmt::pmt_t msg) |
void | message_port_sub (pmt::pmt_t port_id, pmt::pmt_t target) |
void | message_port_unsub (pmt::pmt_t port_id, pmt::pmt_t target) |
virtual bool | message_port_is_hier (pmt::pmt_t port_id) |
virtual bool | message_port_is_hier_in (pmt::pmt_t port_id) |
virtual bool | message_port_is_hier_out (pmt::pmt_t port_id) |
pmt::pmt_t | message_ports_in () |
| Get input message port names.
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pmt::pmt_t | message_ports_out () |
| Get output message port names.
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void | _post (pmt::pmt_t which_port, pmt::pmt_t msg) |
bool | empty_p (pmt::pmt_t which_port) |
| is the queue empty?
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bool | empty_p () |
void | insert_tail (pmt::pmt_t which_port, pmt::pmt_t msg) |
pmt::pmt_t | delete_head_nowait (pmt::pmt_t which_port) |
pmt::pmt_t | delete_head_blocking (pmt::pmt_t which_port) |
msg_queue_t::iterator | get_iterator (pmt::pmt_t which_port) |
void | erase_msg (pmt::pmt_t which_port, msg_queue_t::iterator it) |
virtual bool | has_msg_port (pmt::pmt_t which_port) |
virtual bool | check_topology (int ninputs, int noutputs) |
| Confirm that ninputs and noutputs is an acceptable combination.
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template<typename T > |
void | set_msg_handler (pmt::pmt_t which_port, T msg_handler) |
| Set the callback that is fired when messages are available.
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| gr_msg_accepter () |
| ~gr_msg_accepter () |
void | post (pmt::pmt_t which_port, pmt::pmt_t msg) |
| send msg to msg_accepter on port which_port
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| msg_accepter () |
virtual | ~msg_accepter () |
Additional Inherited Members |
| gr_sync_block (void) |
| gr_sync_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) |
| gr_block (void) |
| gr_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) |
void | set_fixed_rate (bool fixed_rate) |
void | add_item_tag (unsigned int which_output, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F) |
| Adds a new tag onto the given output buffer.
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void | add_item_tag (unsigned int which_output, const gr_tag_t &tag) |
| Adds a new tag onto the given output buffer.
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void | get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end) |
| Given a [start,end), returns a vector of all tags in the range.
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void | get_tags_in_range (std::vector< gr_tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end, const pmt::pmt_t &key) |
| Given a [start,end), returns a vector of all tags in the range with a given key.
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| gr_basic_block (void) |
| gr_basic_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature) |
| Protected constructor prevents instantiation by non-derived classes.
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void | set_input_signature (gr_io_signature_sptr iosig) |
| may only be called during constructor
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void | set_output_signature (gr_io_signature_sptr iosig) |
| may only be called during constructor
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void | set_color (vcolor color) |
| Allow the flowgraph to set for sorting and partitioning.
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vcolor | color () const |
Scramble an input stream using an LFSR. This block works on the LSB only of the input data stream, i.e., on an "unpacked binary" stream, and produces the same format on its output.
- Parameters:
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mask | Polynomial mask for LFSR |
seed | Initial shift register contents |
len | Shift register length |
count | Number of bits after which shift register is reset, 0=never |
The scrambler works by XORing the incoming bit stream by the output of the LFSR. Optionally, after 'count' bits have been processed, the shift register is reset to the seed value. This allows processing fixed length vectors of samples.