+ gr_block_sptr grblock(boost::dynamic_pointer_cast<gr_block, gr_basic_block>(block));
+ if (!grblock)
+ throw std::runtime_error("allocate_buffer found non-gr_block");
+ int item_size = block->output_signature()->sizeof_stream_item(port);
+ int nitems = s_fixed_buffer_size/item_size;
+
+ // Make sure there are at least twice the output_multiple no. of items
+ if (nitems < 2*grblock->output_multiple()) // Note: this means output_multiple()
+ nitems = 2*grblock->output_multiple(); // can't be changed by block dynamically
+
+ // If any downstream blocks are decimators and/or have a large output_multiple,
+ // ensure we have a buffer at least twice their decimation factor*output_multiple
+ gr_basic_block_vector_t blocks = calc_downstream_blocks(block, port);
+ for (gr_basic_block_viter_t p = blocks.begin(); p != blocks.end(); p++) {
+ gr_block_sptr dgrblock(boost::dynamic_pointer_cast<gr_block, gr_basic_block>(*p));
+ if (!dgrblock)
+ throw std::runtime_error("allocate_buffer found non-gr_block");
+ int decimation = (int)(1.0/dgrblock->relative_rate());
+ int multiple = dgrblock->output_multiple();
+ int history = dgrblock->history();
+ nitems = std::max(nitems, 2*(decimation*multiple+history));
+ }
+
+ return gr_make_buffer(nitems, item_size);
+}
+
+void
+gr_simple_flowgraph_detail::setup_connections()
+{
+ // Assign block details to blocks
+ for (gr_basic_block_viter_t p = d_blocks.begin(); p != d_blocks.end(); p++)
+ boost::dynamic_pointer_cast<gr_block, gr_basic_block>(*p)->set_detail(allocate_block_detail(*p));
+
+ // Connect inputs to outputs for each block
+ for(gr_basic_block_viter_t p = d_blocks.begin(); p != d_blocks.end(); p++)
+ connect_block_inputs(*p);
+}
+
+void
+gr_simple_flowgraph_detail::merge_connections(gr_simple_flowgraph_sptr old_sfg)
+{
+ std::map<gr_block_sptr, gr_block_detail_sptr> old_details;
+
+ // Allocate or reuse output buffers
+ for (gr_basic_block_viter_t p = d_blocks.begin(); p != d_blocks.end(); p++) {
+ gr_block_sptr block(boost::dynamic_pointer_cast<gr_block, gr_basic_block>(*p));
+
+ gr_block_detail_sptr old_detail = block->detail();
+ block->set_detail(allocate_block_detail(block, old_detail));
+
+ // Save old detail for use in next step
+ old_details[block] = old_detail;
+ }
+
+ for (gr_basic_block_viter_t p = d_blocks.begin(); p != d_blocks.end(); p++) {
+ gr_block_sptr block(boost::dynamic_pointer_cast<gr_block, gr_basic_block>(*p));
+
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "merge: testing " << (*p) << "...";
+
+ if (old_sfg->d_detail->has_block_p(*p)) {
+ // Block exists in old flow graph
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "used in old flow graph" << std::endl;
+ gr_block_detail_sptr detail = block->detail();
+
+ // Iterate through the inputs and see what needs to be done
+ for (int i = 0; i < detail->ninputs(); i++) {
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "Checking input " << i << "...";
+
+ gr_edge_sptr edge = calc_upstream_edge(*p, i);
+ if (!edge)
+ throw std::runtime_error("merge: missing input edge");
+
+ // Fish out old buffer reader and see if it matches correct buffer from edge list
+ gr_block_sptr src_block(boost::dynamic_pointer_cast<gr_block, gr_basic_block>(edge->src().block()));
+ gr_block_detail_sptr src_detail = src_block->detail();
+ gr_buffer_sptr src_buffer = src_detail->output(edge->src().port());
+ gr_buffer_reader_sptr old_reader;
+ gr_block_detail_sptr old_detail = old_details[block];
+ if (old_detail && i < old_detail->ninputs())
+ old_reader = old_detail->input(i);
+
+ // If there's a match, use it
+ if (old_reader && (src_buffer == old_reader->buffer())) {
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "matched" << std::endl;
+ detail->set_input(i, old_reader);
+
+ }
+ else {
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "needs a new reader" << std::endl;
+
+ // Create new buffer reader and assign
+ detail->set_input(i, gr_buffer_add_reader(src_buffer, block->history()-1));
+ }
+ }
+ }
+ else {
+ // Block is new, it just needs buffer readers at this point
+ if (GR_SIMPLE_FLOWGRAPH_DETAIL_DEBUG)
+ std::cout << "new block" << std::endl;
+ connect_block_inputs(block);
+ }
+ }