71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package videolayerselector
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import (
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"fmt"
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"github.com/livekit/livekit-server/pkg/sfu/buffer"
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dd "github.com/livekit/livekit-server/pkg/sfu/rtpextension/dependencydescriptor"
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)
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type DecodeTarget struct {
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buffer.DependencyDescriptorDecodeTarget
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chain *FrameChain
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active bool
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}
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type FrameDetectionResult struct {
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TargetValid bool
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DTI dd.DecodeTargetIndication
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}
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func NewDecodeTarget(target buffer.DependencyDescriptorDecodeTarget, chain *FrameChain) *DecodeTarget {
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return &DecodeTarget{
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DependencyDescriptorDecodeTarget: target,
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chain: chain,
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}
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}
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func (dt *DecodeTarget) Valid() bool {
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return dt.chain == nil || !dt.chain.Broken()
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}
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func (dt *DecodeTarget) Active() bool {
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return dt.active
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}
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func (dt *DecodeTarget) UpdateActive(activeBitmask uint32) {
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active := (activeBitmask & (1 << dt.Target)) != 0
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dt.active = active
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if dt.chain != nil {
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dt.chain.UpdateActive(active)
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}
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}
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func (dt *DecodeTarget) OnFrame(extFrameNum uint64, fd *dd.FrameDependencyTemplate) (FrameDetectionResult, error) {
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result := FrameDetectionResult{}
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if len(fd.DecodeTargetIndications) <= dt.Target {
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return result, fmt.Errorf("mismatch target %d and len(DecodeTargetIndications) %d", dt.Target, len(fd.DecodeTargetIndications))
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}
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result.DTI = fd.DecodeTargetIndications[dt.Target]
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// The encoder can choose not to use frame chain in theory, and we need to trace every required frame is decodable in this case.
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// But we don't observe this in browser and it makes no sense to not use the chain with svc, so only use chain to detect decode target broken now,
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// and always return decodable if it is not protect by chain.
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result.TargetValid = dt.Valid()
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return result, nil
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}
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