we also need a data_store[module] map

Controller.cpp

@@ -194,25 +194,24 @@ void CController::ReadReflectorThread()
 // This might complete the packet. If so, send it back to the reflector
 void CController::AudiotoCodec2(std::shared_ptr<CTranscoderPacket> packet)
 {
-	uint8_t m17data[8];
-	c2_32.codec2_encode(m17data, packet->GetAudio());
+	// the second half is silent in case this is frame is last.
+	uint8_t m17data[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0x00, 0x01, 0x43, 0x09, 0xe4, 0x9c, 0x08, 0x21 };
 	if (packet->IsSecond())
 	{
-		//move the c2_3200 data to the second half of the M17 packet
-		packet->SetM17Data(m17data, EAudioSection::secondhalf);
+		// get the first half from the store
+		memcpy(m17data, data_store[packet->GetModule()], 8);
+		// and then calculate the second half
+		c2_32.codec2_encode(m17data+8, packet->GetAudio());
 	}
 	else /* the packet is first */
 	{
-		// move it into the packet
-		packet->SetM17Data(m17data, EAudioSection::firsthalf);
-		if (packet->IsLast())
-		{
-			// we have an odd number of packets, so we have to finish up the m17 packet
-			const uint8_t silence[] = {0x00, 0x01, 0x43, 0x09, 0xe4, 0x9c, 0x08, 0x21 };
-			//put codec silence in the second half of the codec
-			packet->SetM17Data(silence, EAudioSection::secondhalf);
-		}
+		// calculate the first half...
+		c2_32.codec2_encode(m17data, packet->GetAudio());
+		// and then copy the calculated data to the data_store
+		memcpy(m17data, data_store[packet->GetModule()], 8);
 	}
+	// put the M17 data into the packet
+	packet->SetM17Data(m17data);
 	// we might be all done...
 	if (packet->AllCodecsAreSet())
 	{

Controller.h

@@ -45,6 +45,7 @@ protected:
 	std::future<void> reflectorFuture, readambeFuture, feedambeFuture, c2Future;
 	std::vector<std::shared_ptr<CDV3003>> dmr_device, dstar_device;
 	std::map<char, int16_t[160]> audio_store;
+	std::map<char, uint8_t[8]> data_store;
 	CUnixDgramReader reader;
 	CUnixDgramWriter writer;
 	CCodec2 c2_16{false};

TranscoderPacket.cpp

@@ -35,7 +35,7 @@ CTranscoderPacket::CTranscoderPacket(const STCPacket &tcp) : dstar_set(false), d
 		break;
 	case ECodecType::c2_1600:
 	case ECodecType::c2_3200:
-		SetM17Data(tcp.m17, EAudioSection::all);
+		SetM17Data(tcp.m17);
 		break;
 	default:
 		std::cerr << "Trying to allocate CTranscoderPacket with an unknown codec type!" << std::endl;
@@ -68,13 +68,10 @@ const STCPacket *CTranscoderPacket::GetTCPacket() const
 	return &tcpacket;
 }
 
-void CTranscoderPacket::SetM17Data(const uint8_t *data, EAudioSection section)
+void CTranscoderPacket::SetM17Data(const uint8_t *data)
 {
-	const unsigned int offset = (EAudioSection::secondhalf == section) ? 8 : 0;
-	const unsigned int size = (EAudioSection::all == section) ? 16 : 8;
-	memcpy(tcpacket.m17+offset, data, size);
-	if (EAudioSection::firsthalf != section)
-		m17_set = true;
+	memcpy(tcpacket.m17, data, 16);
+	m17_set = true;
 }
 
 void CTranscoderPacket::SetDStarData(const uint8_t *dstar)

TranscoderPacket.h

@@ -22,8 +22,6 @@
 
 #include "TCPacketDef.h"
 
-enum class EAudioSection { firsthalf, secondhalf, all };
-
 class CTranscoderPacket
 {
 public:
@@ -39,7 +37,7 @@ public:
 	const uint8_t *GetM17Data() const;
 	void SetDStarData(const uint8_t *dstar);
 	void SetDMRData(const uint8_t *dmr);
-	void SetM17Data(const uint8_t *m17, EAudioSection section);
+	void SetM17Data(const uint8_t *m17);
 
 	// audio
 	int16_t *GetAudio();