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//
// Copyright 2011,2014 Ettus Research LLC
//
// This program 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 of the License, or
// (at your option) any later version.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
#include "recv_packet_demuxer.hpp"
#include <uhd/utils/msg.hpp>
#include <uhd/utils/byteswap.hpp>
#include <boost/thread/mutex.hpp>
#include <uhd/transport/vrt_if_packet.hpp>
#include <uhd/types/metadata.hpp>
#include <queue>
#include <deque>
#include <vector>
using namespace uhd;
using namespace uhd::usrp;
using namespace uhd::transport;
struct recv_pkt_demux_mrb : public managed_recv_buffer
{
public:
recv_pkt_demux_mrb(void){/*NOP*/}
void release(void)
{
delete this;
}
uint32_t buff[10];
};
static UHD_INLINE uint32_t extract_sid(managed_recv_buffer::sptr &buff){
//ASSUME that the data is in little endian format
return uhd::wtohx(buff->cast<const uint32_t *>()[1]);
}
recv_packet_demuxer::~recv_packet_demuxer(void){
/* NOP */
}
class recv_packet_demuxer_impl : public uhd::usrp::recv_packet_demuxer{
public:
recv_packet_demuxer_impl(
transport::zero_copy_if::sptr transport,
const size_t size,
const uint32_t sid_base
):
_transport(transport), _sid_base(sid_base), _queues(size)
{
/* NOP */
}
managed_recv_buffer::sptr get_recv_buff(const size_t index, const double timeout){
boost::mutex::scoped_lock lock(_mutex);
managed_recv_buffer::sptr buff;
//there is already an entry in the queue, so pop that
if (not _queues[index].wrapper.empty()){
std::swap(buff, _queues[index].wrapper.front());
_queues[index].wrapper.pop();
return buff;
}
while (true){
//otherwise call into the transport
buff = _transport->get_recv_buff(timeout);
if (buff.get() == NULL) return buff; //timeout
//check the stream id to know which channel
const size_t rx_index = extract_sid(buff) - _sid_base;
if (rx_index == index) return buff; //got expected message
//otherwise queue and try again
if (rx_index < _queues.size()) _queues[rx_index].wrapper.push(buff);
else
{
UHD_MSG(error) << "Got a data packet with unknown SID " << extract_sid(buff) << std::endl;
recv_pkt_demux_mrb *mrb = new recv_pkt_demux_mrb();
vrt::if_packet_info_t info;
info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_DATA;
info.num_payload_words32 = 1;
info.num_payload_bytes = info.num_payload_words32*sizeof(uint32_t);
info.has_sid = true;
info.sid = _sid_base + index;
vrt::if_hdr_pack_le(mrb->buff, info);
mrb->buff[info.num_header_words32] = rx_metadata_t::ERROR_CODE_OVERFLOW;
return mrb->make(mrb, mrb->buff, info.num_packet_words32*sizeof(uint32_t));
}
}
}
private:
transport::zero_copy_if::sptr _transport;
const uint32_t _sid_base;
boost::mutex _mutex;
struct channel_guts_type{
channel_guts_type(void): wrapper(container){}
std::deque<managed_recv_buffer::sptr> container;
std::queue<managed_recv_buffer::sptr> wrapper;
};
std::vector<channel_guts_type> _queues;
};
recv_packet_demuxer::sptr recv_packet_demuxer::make(transport::zero_copy_if::sptr transport, const size_t size, const uint32_t sid_base){
return sptr(new recv_packet_demuxer_impl(transport, size, sid_base));
}
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