active_decode_targets_helper.h (2259B)
1 /* 2 * Copyright (c) 2020 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_ 12 #define MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_ 13 14 #include <stdint.h> 15 16 #include <bitset> 17 #include <optional> 18 19 #include "api/array_view.h" 20 21 namespace webrtc { 22 23 // Helper class that decides when active_decode_target_bitmask should be written 24 // into the dependency descriptor rtp header extension. 25 // See: https://aomediacodec.github.io/av1-rtp-spec/#a44-switching 26 // This class is thread-compatible 27 class ActiveDecodeTargetsHelper { 28 public: 29 ActiveDecodeTargetsHelper() = default; 30 ActiveDecodeTargetsHelper(const ActiveDecodeTargetsHelper&) = delete; 31 ActiveDecodeTargetsHelper& operator=(const ActiveDecodeTargetsHelper&) = 32 delete; 33 ~ActiveDecodeTargetsHelper() = default; 34 35 // Decides if active decode target bitmask should be attached to the frame 36 // that is about to be sent. 37 void OnFrame(ArrayView<const int> decode_target_protected_by_chain, 38 std::bitset<32> active_decode_targets, 39 bool is_keyframe, 40 int64_t frame_id, 41 ArrayView<const int> chain_diffs); 42 43 // Returns active decode target to attach to the dependency descriptor. 44 std::optional<uint32_t> ActiveDecodeTargetsBitmask() const { 45 if (unsent_on_chain_.none()) 46 return std::nullopt; 47 return last_active_decode_targets_.to_ulong(); 48 } 49 50 std::bitset<32> ActiveChainsBitmask() const { return last_active_chains_; } 51 52 private: 53 // `unsent_on_chain_[i]` indicates last active decode 54 // target bitmask wasn't attached to a packet on the chain with id `i`. 55 std::bitset<32> unsent_on_chain_ = 0; 56 std::bitset<32> last_active_decode_targets_ = 0; 57 std::bitset<32> last_active_chains_ = 0; 58 int64_t last_frame_id_ = 0; 59 }; 60 61 } // namespace webrtc 62 63 #endif // MODULES_RTP_RTCP_SOURCE_ACTIVE_DECODE_TARGETS_HELPER_H_