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https://github.com/livekit/livekit.git
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cnderrauber
5026de2bea
* handle frame number wrap back in svc * Add Slack Notifier * check nil dd ext * log format
59 lines
2.0 KiB
Go
59 lines
2.0 KiB
Go
// Copyright 2024 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 "github.com/livekit/protocol/logger"
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type FrameNumberWrapper struct {
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offset uint64
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last uint64
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inited bool
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logger logger.Logger
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}
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// UpdateAndGet returns the wrapped frame number from the given frame number, and updates the offset to
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// make sure the returned frame number is always inorder. Should only updateOffset if the new frame is a keyframe
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// because frame dependencies uses on the frame number diff so frames inside a GOP should have the same offset.
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func (f *FrameNumberWrapper) UpdateAndGet(new uint64, updateOffset bool) uint64 {
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if !f.inited {
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f.last = new
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f.inited = true
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return new
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}
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if new <= f.last {
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return new + f.offset
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}
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if updateOffset {
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new16 := uint16(new + f.offset)
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last16 := uint16(f.last + f.offset)
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// if new frame number wraps around and is considered as earlier by client, increase offset to make it later
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if diff := new16 - last16; diff > 0x8000 || (diff == 0x8000 && new16 < last16) {
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// increase offset by 6000, nearly 10 seconds for 30fps video with 3 spatial layers
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prevOffset := f.offset
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f.offset += uint64(65535 - diff + 6000)
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f.logger.Debugw("wrap around frame number seen, update offset", "new", new, "last", f.last, "offset", f.offset, "prevOffset", prevOffset, "lastWrapFn", last16, "newWrapFn", new16)
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}
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}
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f.last = new
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return new + f.offset
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}
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func (f *FrameNumberWrapper) LastOrigin() uint64 {
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return f.last
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}
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