chromium/third_party/webrtc/modules/rtp_rtcp/source/active_decode_targets_helper.cc

/*
 *  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 "modules/rtp_rtcp/source/active_decode_targets_helper.h"

#include <stdint.h>

#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"

namespace webrtc {
namespace {

// Returns mask of ids of chains previous frame is part of.
// Assumes for each chain frames are seen in order and no frame on any chain is
// missing. That assumptions allows a simple detection when previous frame is
// part of a chain.
std::bitset<32> LastSendOnChain(int frame_diff,
                                rtc::ArrayView<const int> chain_diffs) { … }

// Returns bitmask with first `num` bits set to 1.
std::bitset<32> AllActive(size_t num) { … }

// Returns bitmask of chains that protect at least one active decode target.
std::bitset<32> ActiveChains(
    rtc::ArrayView<const int> decode_target_protected_by_chain,
    int num_chains,
    std::bitset<32> active_decode_targets) { … }

}  // namespace

void ActiveDecodeTargetsHelper::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) { … }

}  // namespace webrtc