Fix audio sample rate for some xiaomi cameras #2006

pkg/xiaomi/miss/client.go

@@ -271,6 +271,24 @@ type Packet struct {
 	Payload []byte
 }
 
+func (p *Packet) SampleRate() uint32 {
+	// flag:         1 0011 000 - sample rate 16000
+	// flag: 100 00 01 0000 000 - sample rate  8000
+	v := (p.Flags >> 3) & 0b1111
+	if v != 0 {
+		return 16000
+	}
+	return 8000
+}
+
+//func (p *Packet) AudioUnknown1() byte {
+//	return byte((p.Flags >> 7) & 0b11)
+//}
+//
+//func (p *Packet) AudioUnknown2() byte {
+//	return byte((p.Flags >> 9) & 0b11)
+//}
+
 func GenerateKey() ([]byte, []byte, error) {
 	public, private, err := box.GenerateKey(rand.Reader)
 	if err != nil {

pkg/xiaomi/producer.go

@@ -110,7 +110,7 @@ func probe(client *miss.Client, channel, quality, audio uint8) ([]*core.Media, e
 			}
 		case miss.CodecPCMA:
 			if acodec == nil {
-				acodec = &core.Codec{Name: core.CodecPCMA, ClockRate: 8000}
+				acodec = &core.Codec{Name: core.CodecPCMA, ClockRate: pkt.SampleRate()}
 			}
 		case miss.CodecOPUS:
 			if acodec == nil {