merge format and formatdecenc into formats (#222)

pkg/formats/rtpsimpleaudio/decoder.go

@@ -0,0 +1,26 @@
+package rtpsimpleaudio
+
+import (
+	"time"
+
+	"github.com/pion/rtp"
+
+	"github.com/bluenviron/gortsplib/v3/pkg/rtptime"
+)
+
+// Decoder is a RTP/simple audio decoder.
+type Decoder struct {
+	SampleRate int
+
+	timeDecoder *rtptime.Decoder
+}
+
+// Init initializes the decoder.
+func (d *Decoder) Init() {
+	d.timeDecoder = rtptime.NewDecoder(d.SampleRate)
+}
+
+// Decode decodes an audio frame from a RTP packet.
+func (d *Decoder) Decode(pkt *rtp.Packet) ([]byte, time.Duration, error) {
+	return pkt.Payload, d.timeDecoder.Decode(pkt.Timestamp), nil
+}