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/* -*- c++ -*- */
/*
* Copyright 2012-2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "message_burst_source_impl.h"
#include <gnuradio/io_signature.h>
#include <cstdio>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdexcept>
#include <string.h>
#include <gnuradio/tags.h>
namespace gr {
namespace blocks {
message_burst_source::sptr
message_burst_source::make(size_t itemsize, int msgq_limit)
{
return gnuradio::get_initial_sptr
(new message_burst_source_impl(itemsize, msgq_limit));
}
message_burst_source::sptr
message_burst_source::make(size_t itemsize, msg_queue::sptr msgq)
{
return gnuradio::get_initial_sptr
(new message_burst_source_impl(itemsize, msgq));
}
message_burst_source_impl::message_burst_source_impl(size_t itemsize, int msgq_limit)
: sync_block("message_burst_source",
io_signature::make(0, 0, 0),
io_signature::make(1, 1, itemsize)),
d_itemsize(itemsize), d_msgq(msg_queue::make(msgq_limit)),
d_msg_offset(0), d_eof(false)
{
std::stringstream id;
id << name() << unique_id();
d_me = pmt::string_to_symbol(id.str());
}
message_burst_source_impl::message_burst_source_impl(size_t itemsize, msg_queue::sptr msgq)
: sync_block("message_burst_source",
io_signature::make(0, 0, 0),
io_signature::make(1, 1, itemsize)),
d_itemsize(itemsize), d_msgq(msgq),
d_msg_offset(0), d_eof(false)
{
std::stringstream id;
id << name() << unique_id();
d_me = pmt::string_to_symbol(id.str());
}
message_burst_source_impl::~message_burst_source_impl()
{
}
int
message_burst_source_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
char *out = (char*)output_items[0];
int nn = 0;
uint64_t abs_sample_count = nitems_written(0);
while(nn < noutput_items) {
if(d_msg) {
//
// Consume whatever we can from the current message
//
int mm = std::min(noutput_items - nn,
(int)((d_msg->length() - d_msg_offset) / d_itemsize));
memcpy(out, &(d_msg->msg()[d_msg_offset]), mm * d_itemsize);
nn += mm;
out += mm * d_itemsize;
d_msg_offset += mm * d_itemsize;
assert(d_msg_offset <= d_msg->length());
if(d_msg_offset == d_msg->length()) {
if(d_msg->type() == 1) // type == 1 sets EOF
d_eof = true;
d_msg.reset();
//tag end of burst
add_item_tag(0, //stream ID
abs_sample_count+nn-1, //sample number
pmt::string_to_symbol("tx_eob"),
pmt::from_bool(1),
d_me); //block src id
}
}
else {
//
// No current message
//
if(d_msgq->empty_p() && nn > 0) { // no more messages in the queue, return what we've got
break;
}
if(d_eof)
return -1;
d_msg = d_msgq->delete_head(); // block, waiting for a message
d_msg_offset = 0;
//tag start of burst
add_item_tag(0, //stream ID
abs_sample_count+nn, //sample number
pmt::string_to_symbol("tx_sob"),
pmt::from_bool(1),
d_me); //block src id
if((d_msg->length() % d_itemsize) != 0)
throw std::runtime_error("msg length is not a multiple of d_itemsize");
}
}
return nn;
}
} /* namespace blocks */
} /* namespace gr */
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