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neko-custom/server/internal/capture/streamsink.go

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2022-09-17 22:43:17 +12:00
package capture
import (
"errors"
"sync"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"m1k1o/neko/internal/capture/gst"
"m1k1o/neko/internal/types"
"m1k1o/neko/internal/types/codec"
)
var moveSinkListenerMu = sync.Mutex{}
type StreamSinkManagerCtx struct {
logger zerolog.Logger
mu sync.Mutex
wg sync.WaitGroup
codec codec.RTPCodec
pipeline *gst.Pipeline
pipelineMu sync.Mutex
pipelineFn func() (*gst.Pipeline, error)
listeners int
listenersMu sync.Mutex
sampleFn func(sample types.Sample)
}
func streamSinkNew(codec codec.RTPCodec, pipelineFn func() (*gst.Pipeline, error), video_id string) *StreamSinkManagerCtx {
logger := log.With().
Str("module", "capture").
Str("submodule", "stream-sink").
Str("video_id", video_id).Logger()
manager := &StreamSinkManagerCtx{
logger: logger,
codec: codec,
pipelineFn: pipelineFn,
}
return manager
}
func (manager *StreamSinkManagerCtx) shutdown() {
manager.logger.Info().Msgf("shutdown")
manager.destroyPipeline()
manager.wg.Wait()
}
func (manager *StreamSinkManagerCtx) OnSample(listener func(sample types.Sample)) {
manager.sampleFn = listener
}
func (manager *StreamSinkManagerCtx) Codec() codec.RTPCodec {
return manager.codec
}
func (manager *StreamSinkManagerCtx) start() error {
if manager.listeners == 0 {
err := manager.createPipeline()
if err != nil && !errors.Is(err, types.ErrCapturePipelineAlreadyExists) {
return err
}
manager.logger.Info().Msgf("first listener, starting")
}
return nil
}
func (manager *StreamSinkManagerCtx) stop() {
if manager.listeners == 0 {
manager.destroyPipeline()
manager.logger.Info().Msgf("last listener, stopping")
}
}
func (manager *StreamSinkManagerCtx) addListener() {
manager.listenersMu.Lock()
manager.listeners++
manager.listenersMu.Unlock()
}
func (manager *StreamSinkManagerCtx) removeListener() {
manager.listenersMu.Lock()
manager.listeners--
manager.listenersMu.Unlock()
}
func (manager *StreamSinkManagerCtx) AddListener() error {
manager.mu.Lock()
defer manager.mu.Unlock()
// start if stopped
if err := manager.start(); err != nil {
return err
}
// add listener
manager.addListener()
return nil
}
func (manager *StreamSinkManagerCtx) RemoveListener() error {
manager.mu.Lock()
defer manager.mu.Unlock()
// remove listener
manager.removeListener()
// stop if started
manager.stop()
return nil
}
func (manager *StreamSinkManagerCtx) ListenersCount() int {
manager.listenersMu.Lock()
defer manager.listenersMu.Unlock()
return manager.listeners
}
func (manager *StreamSinkManagerCtx) Started() bool {
return manager.ListenersCount() > 0
}
func (manager *StreamSinkManagerCtx) createPipeline() error {
manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
if manager.pipeline != nil {
return types.ErrCapturePipelineAlreadyExists
}
var err error
manager.logger.Info().
Str("codec", manager.codec.Name).
Msgf("creating pipeline")
manager.pipeline, err = manager.pipelineFn()
if err != nil {
return err
}
manager.logger.Info().
Str("codec", manager.codec.Name).
Str("src", manager.pipeline.Src).
Msgf("created pipeline")
manager.pipeline.AttachAppsink("appsink")
manager.pipeline.Play()
manager.wg.Add(1)
pipeline := manager.pipeline
go func() {
manager.logger.Debug().Msg("started emitting samples")
defer manager.wg.Done()
for {
sample, ok := <-pipeline.Sample
if !ok {
manager.logger.Debug().Msg("stopped emitting samples")
return
}
manager.sampleFn(sample)
}
}()
return nil
}
func (manager *StreamSinkManagerCtx) destroyPipeline() {
manager.pipelineMu.Lock()
defer manager.pipelineMu.Unlock()
if manager.pipeline == nil {
return
}
manager.pipeline.Destroy()
manager.logger.Info().Msgf("destroying pipeline")
manager.pipeline = nil
}