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/*
* 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.
*/
#ifndef MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_
#define MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_
#include <stdint.h>
#include <bitset>
#include <optional>
#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: https://aomediacodec.github.io/av1-rtp-spec/#a44-switching
// This class is thread-compatible
class ActiveDecodeTargetsHelper {
public:
ActiveDecodeTargetsHelper() = default;
ActiveDecodeTargetsHelper(const ActiveDecodeTargetsHelper&) = delete;
ActiveDecodeTargetsHelper& operator=(const ActiveDecodeTargetsHelper&) =
delete;
~ActiveDecodeTargetsHelper() = default;
// Decides if active decode target bitmask should be attached to the frame
// that is about to be sent.
void OnFrame(ArrayView<const int> decode_target_protected_by_chain,
std::bitset<32> active_decode_targets,
bool is_keyframe,
int64_t frame_id,
ArrayView<const int> chain_diffs);
// Returns active decode target to attach to the dependency descriptor.
std::optional<uint32_t> ActiveDecodeTargetsBitmask() const {
if (unsent_on_chain_.none())
return std::nullopt;
return last_active_decode_targets_.to_ulong();
}
std::bitset<32> ActiveChainsBitmask() const { return last_active_chains_; }
private:
// `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
#endif // MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_
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