blob: 13755e8d80565dfd907a5b4480c502d2aab00b3e [file] [log] [blame]
* Copyright (c) 2020 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.
#include <stdint.h>
#include <bitset>
#include "absl/types/optional.h"
#include "api/array_view.h"
namespace webrtc {
// Helper class that decides when active_decode_target_bitmask should be written
// into the dependency descriptor rtp header extension.
// See:
// This class is thread-compatible
class ActiveDecodeTargetsHelper {
ActiveDecodeTargetsHelper() = default;
ActiveDecodeTargetsHelper(const ActiveDecodeTargetsHelper&) = delete;
ActiveDecodeTargetsHelper& operator=(const ActiveDecodeTargetsHelper&) =
~ActiveDecodeTargetsHelper() = default;
// Decides if active decode target bitmask should be attached to the frame
// that is about to be sent.
void OnFrame(rtc::ArrayView<const int> decode_target_protected_by_chain,
std::bitset<32> active_decode_targets,
bool is_keyframe,
int64_t frame_id,
rtc::ArrayView<const int> chain_diffs);
// Returns active decode target to attach to the dependency descriptor.
absl::optional<uint32_t> ActiveDecodeTargetsBitmask() const {
if (unsent_on_chain_.none())
return absl::nullopt;
return last_active_decode_targets_.to_ulong();
std::bitset<32> ActiveChainsBitmask() const { return last_active_chains_; }
// `unsent_on_chain_[i]` indicates last active decode
// target bitmask wasn't attached to a packet on the chain with id `i`.
std::bitset<32> unsent_on_chain_ = 0;
std::bitset<32> last_active_decode_targets_ = 0;
std::bitset<32> last_active_chains_ = 0;
int64_t last_frame_id_ = 0;
} // namespace webrtc