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/*
Copyright (C) 2026 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_PACKET_QUEUE_H
#define DCPOMATIC_PACKET_QUEUE_H
/** @file src/lib/packet_queue.h
* @brief PacketQueue parent class.
*/
#include <boost/optional.hpp>
#include <boost/variant.hpp>
#include <cstdint>
#include <deque>
struct AVPacket;
/** @class PacketQueue
* @brief Parent class for things which take and then return AVPackets, possibly
* re-ordering them.
*/
class PacketQueue
{
public:
virtual ~PacketQueue() = default;
enum class Type {
VIDEO,
AUDIO,
SUBTITLE,
DROP,
};
/** Container for the only information we need to keep from a DROP packet */
struct PacketInfo {
PacketInfo(AVPacket* packet);
int stream_index;
int64_t dts;
};
typedef boost::variant<AVPacket*, PacketInfo> Packet;
/** Add a packet to the queue. Does not ref the packet; we expect
* the packet to be freed when it comes out of get() (or by clear()).
*/
virtual void add(AVPacket* packet, Type type) = 0;
/** Get the next packet to process.
* @param flushing should be true if we are flushing at the end of a decode.
* When this is true the queue will be emptied without trying to re-order it.
* Returns boost::none when there are no more packets to get.
*/
virtual boost::optional<std::pair<Packet, Type>> get(bool flushing) = 0;
/** Clear the queue. Packets will be freed. */
virtual void clear() = 0;
};
#endif
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