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Go
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import ( "bufio" "bytes" "context" "errors" "fmt" "io" "strings" "time"
"github.com/go-gst/go-gst/gst" "github.com/go-gst/go-gst/gst/app" "stream.place/streamplace/pkg/aqtime" "stream.place/streamplace/pkg/constants" "stream.place/streamplace/pkg/log")
// ingest a H264+AAC fragmented-MP4 stream (the MistServer live .mp4 output, or// an fMP4 push to /live)func (mm *MediaManager) MP4Ingest(ctx context.Context, input io.Reader, ms MediaSigner) error { shouldRecord, err := mm.shouldRecord(ctx, ms.Streamer()) if err != nil { return err } if shouldRecord { log.Log(ctx, "recording ingest stream to file", "streamer", ms.Streamer()) var finalize func() input, finalize = mm.recordTee(ctx, input, ms.Streamer(), ".rtmp.mp4") defer finalize() } else { log.Log(ctx, "not recording ingest stream to file", "streamer", ms.Streamer()) } ctx, cancel := context.WithCancel(ctx) defer cancel()
signer, err := mm.SegmentAndSignElem(ctx, ms) if err != nil { return err } pipeline, err := buildMP4IngestPipeline(ctx, input, signer) if err != nil { return err }
busErr := make(chan error) go func() { busErr <- HandleBusMessages(ctx, pipeline) }()
go mm.HandleKeyRevocation(ctx, ms, pipeline)
if err := pipeline.SetState(gst.StatePlaying); err != nil { return err } defer func() { if err := pipeline.SetState(gst.StateNull); err != nil { log.Error(ctx, "error setting pipeline to null state", "error", err) } }()
return <-busErr}
// buildMP4IngestPipeline builds the H264+AAC fragmented-MP4 demux graph (video// → h264parse, audio → Opus re-encode) and links both branches into signerElem// — the muxl signing bin that emits one bare canonical .m4s per GoP. Shared by// the in-process MP4Ingest and the isolated ingest worker, which differ only in// where signerElem routes its segments (ValidateMP4 vs. a frame writer to the// main process).//// The source is fMP4, not MKV, very much on purpose: MP4 track fragments carry// both decode (tfdt/trun) and presentation (ctts) timestamps, so qtdemux hands// us the encoder's real DTS. Matroska carries only presentation timestamps, so// the old MKV ingest had to *reconstruct* DTS with h264timestamper — which// guesses a worst-case full-DPB reorder window for streams whose SPS doesn't// declare one (notably VideoToolbox), minting a constant spurious PTS−DTS// offset that pushed every GoP's presentation past its segment's declared// window and broke WebRTC playback at every keyframe. Real DTS in the// container means no reconstruction and no guessing.// matroskaMagic is the EBML header every Matroska/WebM stream opens with.var matroskaMagic = []byte{0x1A, 0x45, 0xDF, 0xA3}
// rejectMatroska peeks at the ingest stream and fails fast with a diagnosis if// it's Matroska. MKV was this pipeline's previous bridge format, so the most// likely stray MKV source is a MistServer still running the legacy MKVExec// process config (`streamplace live` POSTing MKV to /live on a restart loop) —// without the sniff that just looks like qtdemux dying instantly, over and// over, which is a miserable thing to debug. Returns a reader that includes// the peeked bytes.func rejectMatroska(input io.Reader) (io.Reader, error) { br := bufio.NewReader(input) head, err := br.Peek(len(matroskaMagic)) if err != nil { if errors.Is(err, io.EOF) { return br, nil // shorter than the magic; let the pipeline EOS/complain } return nil, fmt.Errorf("peek ingest stream: %w", err) } if bytes.Equal(head, matroskaMagic) { return nil, fmt.Errorf("ingest input is Matroska (MKV), but this node ingests fragmented MP4 — a MistServer running the legacy MKVExec process config is probably still pushing MKV to /live; update its config (see docker/mistserver.json)") } return br, nil}
func buildMP4IngestPipeline(ctx context.Context, input io.Reader, signerElem *gst.Element) (*gst.Pipeline, error) { input, err := rejectMatroska(input) if err != nil { return nil, err } // Queue sizing: qtdemux feeds both branches from one thread, and the fMP4 // muxer downstream is an aggregator — it consumes NOTHING until every pad // has data. If the video track goes sparse (e.g. MistServer drops all delta // frames when a push falls behind, leaving ~1s-apart keyframes), the audio // branch must buffer a full video-frame gap while the demux walks the byte // stream to the next video frame. gst's default queue caps at // max-size-time=1s, so a ≥1s video gap fills the audio queue, blocks the // demux, starves the muxer's video pad, and deadlocks the whole graph with // no EOS — a live stream wedges until the watchdog kills it. Use the shared // Queue2Big preset (no time/buffer cap, generous byte cap) like the other // demux-fed pipelines (transcode, rtmp_push, packetize, media_data_parser). pipelineSlice := []string{ "appsrc name=streamsrc ! qtdemux name=demux", "demux. ! " + constants.Queue2Big + " ! h264parse name=videoout", "demux. ! " + constants.Queue2Big + " ! fdkaacdec ! audioresample ! opusenc name=audioenc", } pipeline, err := gst.NewPipelineFromString(strings.Join(pipelineSlice, "\n")) if err != nil { return nil, fmt.Errorf("error creating MP4Ingest pipeline: %w", err) } srcele, err := pipeline.GetElementByName("streamsrc") if err != nil { return nil, err } app.SrcFromElement(srcele).SetCallbacks(&app.SourceCallbacks{ NeedDataFunc: ReaderNeedDataIncremental(ctx, input), }) parseEle, err := pipeline.GetElementByName("videoout") if err != nil { return nil, err } if err := pipeline.Add(signerElem); err != nil { return nil, err } if err := parseEle.Link(signerElem); err != nil { return nil, err } audioenc, err := pipeline.GetElementByName("audioenc") if err != nil { return nil, err } if err := audioenc.Link(signerElem); err != nil { return nil, err } return pipeline, nil}
// debugRecordingFlushTimeout bounds how long ingest teardown waits for a debug// recording to finalize — for S3 the commit only happens at Close, so an// unbounded wait could wedge teardown while an unwaited exit loses the object.// Generous on purpose: at teardown there can be up to ~128 MB of backpressured// parts still uploading (multipartUploadConcurrency × MultipartPartSize), and a// slow-but-working uplink deserves the time to land them — a post-stream worker// lingering is cheap, a lost recording isn't. A genuinely stalled connection is// bounded separately by the s3 package's per-operation timeouts; past this// window the recording is abandoned (logged by the dump goroutine when its op// timeouts fire; bucket lifecycle rules should reap the dangling multipart).const debugRecordingFlushTimeout = 5 * time.Minute
// recordTee wires up a debug recording: everything read through the returned// reader is teed into an asynchronous dumpToFile. The returned finalize ends// the dump (closing the tee's pipe — the dump's io.Copy never sees EOF// otherwise, since a TeeReader doesn't propagate one) and waits, bounded, for// it to commit. Callers MUST finalize after ingest ends: on the S3 path the// object only exists once Close commits the upload, so skipping it (e.g. a// worker process exiting) silently loses the recording.func (mm *MediaManager) recordTee(ctx context.Context, r io.Reader, user string, filesuffix string) (io.Reader, func()) { pr, pw := io.Pipe() done := make(chan struct{}) go func() { defer close(done) if err := mm.dumpToFile(ctx, pr, user, filesuffix); err != nil { log.Error(ctx, "error dumping to file", "error", err, "streamer", user) } }() finalize := func() { pw.Close() select { case <-done: case <-time.After(debugRecordingFlushTimeout): log.Error(ctx, "debug recording did not finalize in time", "streamer", user) } } return io.TeeReader(r, pw), finalize}
func (mm *MediaManager) dumpToFile(ctx context.Context, r io.Reader, user string, filesuffix string) error { now := aqtime.FromTime(time.Now()) filename := fmt.Sprintf("%s%s", now.FileSafeString(), filesuffix) // Streams to S3 when configured (production), else a local file under DataDir // (dev). Close finalizes either target — for S3 it commits the upload. f, err := mm.cli.DebugRecordingCreate(ctx, []string{"debug-recordings", user, filename}, "video/mp4", false) if err != nil { return fmt.Errorf("failed to create debug recording: %w", err) } if _, err = io.Copy(f, r); err != nil { f.Close() return fmt.Errorf("failed to copy to debug recording: %w", err) } if err = f.Close(); err != nil { return fmt.Errorf("failed to finalize debug recording: %w", err) } return nil}