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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_RTP_PACKET_INFOS_H_
#define API_RTP_PACKET_INFOS_H_
#include <utility>
#include <vector>
#include "api/make_ref_counted.h"
#include "api/ref_counted_base.h"
#include "api/rtp_packet_info.h"
#include "api/scoped_refptr.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// Semi-immutable structure to hold information about packets used to assemble
// an audio or video frame. Uses internal reference counting to make it very
// cheap to copy.
//
// We should ideally just use `std::vector<RtpPacketInfo>` and have it
// `std::move()`-ed as the per-packet information is transferred from one object
// to another. But moving the info, instead of copying it, is not easily done
// for the current video code.
class RTC_EXPORT RtpPacketInfos {
public:
using vector_type = std::vector<RtpPacketInfo>;
using value_type = vector_type::value_type;
using size_type = vector_type::size_type;
using difference_type = vector_type::difference_type;
using const_reference = vector_type::const_reference;
using const_pointer = vector_type::const_pointer;
using const_iterator = vector_type::const_iterator;
using const_reverse_iterator = vector_type::const_reverse_iterator;
using reference = const_reference;
using pointer = const_pointer;
using iterator = const_iterator;
using reverse_iterator = const_reverse_iterator;
RtpPacketInfos() {}
explicit RtpPacketInfos(const vector_type& entries)
: data_(Data::Create(entries)) {}
explicit RtpPacketInfos(vector_type&& entries)
: data_(Data::Create(std::move(entries))) {}
RtpPacketInfos(const RtpPacketInfos& other) = default;
RtpPacketInfos(RtpPacketInfos&& other) = default;
RtpPacketInfos& operator=(const RtpPacketInfos& other) = default;
RtpPacketInfos& operator=(RtpPacketInfos&& other) = default;
const_reference operator[](size_type pos) const { return entries()[pos]; }
const_reference at(size_type pos) const { return entries().at(pos); }
const_reference front() const { return entries().front(); }
const_reference back() const { return entries().back(); }
const_iterator begin() const { return entries().begin(); }
const_iterator end() const { return entries().end(); }
const_reverse_iterator rbegin() const { return entries().rbegin(); }
const_reverse_iterator rend() const { return entries().rend(); }
const_iterator cbegin() const { return entries().cbegin(); }
const_iterator cend() const { return entries().cend(); }
const_reverse_iterator crbegin() const { return entries().crbegin(); }
const_reverse_iterator crend() const { return entries().crend(); }
bool empty() const { return entries().empty(); }
size_type size() const { return entries().size(); }
private:
class Data final : public RefCountedNonVirtual<Data> {
public:
static scoped_refptr<Data> Create(const vector_type& entries) {
// Performance optimization for the empty case.
if (entries.empty()) {
return nullptr;
}
return make_ref_counted<Data>(entries);
}
static scoped_refptr<Data> Create(vector_type&& entries) {
// Performance optimization for the empty case.
if (entries.empty()) {
return nullptr;
}
return make_ref_counted<Data>(std::move(entries));
}
const vector_type& entries() const { return entries_; }
explicit Data(const vector_type& entries) : entries_(entries) {}
explicit Data(vector_type&& entries) : entries_(std::move(entries)) {}
~Data() = default;
private:
const vector_type entries_;
};
static const vector_type& empty_entries() {
static const vector_type& value = *new vector_type();
return value;
}
const vector_type& entries() const {
if (data_ != nullptr) {
return data_->entries();
} else {
return empty_entries();
}
}
scoped_refptr<Data> data_;
};
} // namespace webrtc
#endif // API_RTP_PACKET_INFOS_H_
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