client: fix OnResponse() not getting called when playing / recording (#290)

async_processor.go

@@ -0,0 +1,49 @@
+package gortsplib
+
+import (
+	"github.com/bluenviron/gortsplib/v3/pkg/ringbuffer"
+)
+
+// this struct contains a queue that allows to detach the routine that is reading a stream
+// from the routine that is writing a stream.
+type asyncProcessor struct {
+	running bool
+	buffer  *ringbuffer.RingBuffer
+
+	done chan struct{}
+}
+
+func (w *asyncProcessor) allocateBuffer(size int) {
+	w.buffer, _ = ringbuffer.New(uint64(size))
+}
+
+func (w *asyncProcessor) start() {
+	w.running = true
+	w.done = make(chan struct{})
+	go w.run()
+}
+
+func (w *asyncProcessor) stop() {
+	if w.running {
+		w.buffer.Close()
+		<-w.done
+		w.running = false
+	}
+}
+
+func (w *asyncProcessor) run() {
+	defer close(w.done)
+
+	for {
+		tmp, ok := w.buffer.Pull()
+		if !ok {
+			return
+		}
+
+		tmp.(func())()
+	}
+}
+
+func (w *asyncProcessor) queue(cb func()) {
+	w.buffer.Push(cb)
+}