|
| 1 | +package intervalpli |
| 2 | + |
| 3 | +import ( |
| 4 | + "sync" |
| 5 | + "time" |
| 6 | + |
| 7 | + "github.com/pion/interceptor" |
| 8 | + "github.com/pion/logging" |
| 9 | + "github.com/pion/rtcp" |
| 10 | +) |
| 11 | + |
| 12 | +// GeneratorInterceptor interceptor sends PLI packets. |
| 13 | +// Implements PLI in a naive way: sends a PLI for each new track that support PLI, periodically. |
| 14 | +type GeneratorInterceptor struct { |
| 15 | + interceptor.NoOp |
| 16 | + |
| 17 | + interval time.Duration |
| 18 | + streams sync.Map |
| 19 | + immediatePLINeeded chan []uint32 |
| 20 | + |
| 21 | + log logging.LeveledLogger |
| 22 | + m sync.Mutex |
| 23 | + wg sync.WaitGroup |
| 24 | + |
| 25 | + close chan struct{} |
| 26 | +} |
| 27 | + |
| 28 | +// NewGeneratorInterceptor returns a new GeneratorInterceptor interceptor. |
| 29 | +func NewGeneratorInterceptor(opts ...GeneratorOption) (*GeneratorInterceptor, error) { |
| 30 | + r := &GeneratorInterceptor{ |
| 31 | + interval: 3 * time.Second, |
| 32 | + log: logging.NewDefaultLoggerFactory().NewLogger("pli_generator"), |
| 33 | + immediatePLINeeded: make(chan []uint32, 1), |
| 34 | + close: make(chan struct{}), |
| 35 | + } |
| 36 | + |
| 37 | + for _, opt := range opts { |
| 38 | + if err := opt(r); err != nil { |
| 39 | + return nil, err |
| 40 | + } |
| 41 | + } |
| 42 | + |
| 43 | + return r, nil |
| 44 | +} |
| 45 | + |
| 46 | +func (r *GeneratorInterceptor) isClosed() bool { |
| 47 | + select { |
| 48 | + case <-r.close: |
| 49 | + return true |
| 50 | + default: |
| 51 | + return false |
| 52 | + } |
| 53 | +} |
| 54 | + |
| 55 | +// Close closes the interceptor. |
| 56 | +func (r *GeneratorInterceptor) Close() error { |
| 57 | + defer r.wg.Wait() |
| 58 | + r.m.Lock() |
| 59 | + defer r.m.Unlock() |
| 60 | + |
| 61 | + if !r.isClosed() { |
| 62 | + close(r.close) |
| 63 | + } |
| 64 | + |
| 65 | + return nil |
| 66 | +} |
| 67 | + |
| 68 | +// BindRTCPWriter lets you modify any outgoing RTCP packets. It is called once per PeerConnection. The returned method |
| 69 | +// will be called once per packet batch. |
| 70 | +func (r *GeneratorInterceptor) BindRTCPWriter(writer interceptor.RTCPWriter) interceptor.RTCPWriter { |
| 71 | + r.m.Lock() |
| 72 | + defer r.m.Unlock() |
| 73 | + |
| 74 | + if r.isClosed() { |
| 75 | + return writer |
| 76 | + } |
| 77 | + |
| 78 | + r.wg.Add(1) |
| 79 | + |
| 80 | + go r.loop(writer) |
| 81 | + |
| 82 | + return writer |
| 83 | +} |
| 84 | + |
| 85 | +func (r *GeneratorInterceptor) loop(rtcpWriter interceptor.RTCPWriter) { |
| 86 | + defer r.wg.Done() |
| 87 | + |
| 88 | + ticker, tickerChan := r.createLoopTicker() |
| 89 | + |
| 90 | + defer func() { |
| 91 | + if ticker != nil { |
| 92 | + ticker.Stop() |
| 93 | + } |
| 94 | + }() |
| 95 | + |
| 96 | + for { |
| 97 | + select { |
| 98 | + case ssrcs := <-r.immediatePLINeeded: |
| 99 | + r.writePLIs(rtcpWriter, ssrcs) |
| 100 | + |
| 101 | + case <-tickerChan: |
| 102 | + ssrcs := make([]uint32, 0) |
| 103 | + |
| 104 | + r.streams.Range(func(k, value interface{}) bool { |
| 105 | + key, ok := k.(uint32) |
| 106 | + if !ok { |
| 107 | + return false |
| 108 | + } |
| 109 | + |
| 110 | + ssrcs = append(ssrcs, key) |
| 111 | + return true |
| 112 | + }) |
| 113 | + |
| 114 | + r.writePLIs(rtcpWriter, ssrcs) |
| 115 | + |
| 116 | + case <-r.close: |
| 117 | + return |
| 118 | + } |
| 119 | + } |
| 120 | +} |
| 121 | + |
| 122 | +func (r *GeneratorInterceptor) createLoopTicker() (*time.Ticker, <-chan time.Time) { |
| 123 | + if r.interval > 0 { |
| 124 | + ticker := time.NewTicker(r.interval) |
| 125 | + return ticker, ticker.C |
| 126 | + } |
| 127 | + |
| 128 | + return nil, make(chan time.Time) |
| 129 | +} |
| 130 | + |
| 131 | +func (r *GeneratorInterceptor) writePLIs(rtcpWriter interceptor.RTCPWriter, ssrcs []uint32) { |
| 132 | + if len(ssrcs) == 0 { |
| 133 | + return |
| 134 | + } |
| 135 | + |
| 136 | + pkts := []rtcp.Packet{} |
| 137 | + |
| 138 | + for _, ssrc := range ssrcs { |
| 139 | + pkts = append(pkts, &rtcp.PictureLossIndication{MediaSSRC: ssrc}) |
| 140 | + } |
| 141 | + |
| 142 | + if _, err := rtcpWriter.Write(pkts, interceptor.Attributes{}); err != nil { |
| 143 | + r.log.Warnf("failed sending: %+v", err) |
| 144 | + } |
| 145 | +} |
| 146 | + |
| 147 | +// BindRemoteStream lets you modify any incoming RTP packets. It is called once for per RemoteStream. The returned method |
| 148 | +// will be called once per rtp packet. |
| 149 | +func (r *GeneratorInterceptor) BindRemoteStream(info *interceptor.StreamInfo, reader interceptor.RTPReader) interceptor.RTPReader { |
| 150 | + if !streamSupportPli(info) { |
| 151 | + return reader |
| 152 | + } |
| 153 | + |
| 154 | + r.streams.Store(info.SSRC, nil) |
| 155 | + // New streams need to receive a PLI as soon as possible. |
| 156 | + r.ForcePLI(info.SSRC) |
| 157 | + |
| 158 | + return reader |
| 159 | +} |
| 160 | + |
| 161 | +// UnbindLocalStream is called when the Stream is removed. It can be used to clean up any data related to that track. |
| 162 | +func (r *GeneratorInterceptor) UnbindLocalStream(info *interceptor.StreamInfo) { |
| 163 | + r.streams.Delete(info.SSRC) |
| 164 | +} |
| 165 | + |
| 166 | +// BindRTCPReader lets you modify any incoming RTCP packets. It is called once per sender/receiver, however this might |
| 167 | +// change in the future. The returned method will be called once per packet batch. |
| 168 | +func (r *GeneratorInterceptor) BindRTCPReader(reader interceptor.RTCPReader) interceptor.RTCPReader { |
| 169 | + return reader |
| 170 | +} |
| 171 | + |
| 172 | +// ForcePLI sends a PLI request to the tracks matching the provided SSRCs. |
| 173 | +func (r *GeneratorInterceptor) ForcePLI(ssrc ...uint32) { |
| 174 | + r.immediatePLINeeded <- ssrc |
| 175 | +} |
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