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//
// Copyright 2016 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef INCLUDED_LIBUHD_TRANSPORT_MUXED_ZERO_COPY_IF_HPP
#define INCLUDED_LIBUHD_TRANSPORT_MUXED_ZERO_COPY_IF_HPP
#include <uhd/config.hpp>
#include <uhd/transport/zero_copy.hpp>
#include <uhd/utils/noncopyable.hpp>
#include <stdint.h>
#include <functional>
namespace uhd { namespace transport {
/*!
* Implements a software muxed-demuxed zero-copy transport
* This is a wrapper around a base transport that allows
* creation of virtual zero_copy_if streams that are
* indistinguishable from physical transport streams.
* This class handles demuxing receive streams into the
* appropriate virtual streams with the given classifier
* function. A worker therad is spawned to handle the demuxing.
*/
class muxed_zero_copy_if : private uhd::noncopyable
{
public:
typedef std::shared_ptr<muxed_zero_copy_if> sptr;
/*!
* Function to classify the stream based on the payload.
* The classifier must return a stream number, an arbitrary
* identifier for a virtual stream that is consistent with
* the stream number used in the make_stream and remove_stream
* fuctions
* \param buff a pointer to the payload of the frame
* \param size number of bytes in the frame payload
* \return stream number
*/
typedef std::function<uint32_t(void* buff, size_t size)> stream_classifier_fn;
//! virtual dtor
virtual ~muxed_zero_copy_if() {}
//! Make a virtual transport for the specified stream number
virtual zero_copy_if::sptr make_stream(const uint32_t stream_num) = 0;
//! Unregister the stream number. All packets destined to the stream will be dropped.
virtual void remove_stream(const uint32_t stream_num) = 0;
//! Get number of frames dropped due to unregistered streams
virtual size_t get_num_dropped_frames() const = 0;
//! Make a new demuxer from a transport and parameters
static sptr make(zero_copy_if::sptr base_xport,
stream_classifier_fn classify_fn,
size_t max_streams);
};
}} // namespace uhd::transport
#endif /* INCLUDED_LIBUHD_TRANSPORT_MUXED_ZERO_COPY_IF_HPP */
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