Add audio support

limelight-common/AudioStream.c

@@ -0,0 +1,177 @@
+#include "Limelight-internal.h"
+#include "PlatformSockets.h"
+#include "PlatformThreads.h"
+#include "LinkedBlockingQueue.h"
+
+static AUDIO_RENDERER_CALLBACKS callbacks;
+static IP_ADDRESS remoteHost;
+
+static SOCKET rtpSocket = INVALID_SOCKET;
+
+static LINKED_BLOCKING_QUEUE packetQueue;
+
+static PLT_THREAD udpPingThread;
+static PLT_THREAD receiveThread;
+static PLT_THREAD decoderThread;
+
+#define RTP_PORT 48000
+
+void initializeAudioStream(IP_ADDRESS host, PAUDIO_RENDERER_CALLBACKS arCallbacks) {
+	memcpy(&callbacks, arCallbacks, sizeof(callbacks));
+	remoteHost = host;
+
+	LbqInitializeLinkedBlockingQueue(&packetQueue, 30);
+}
+
+void destroyAudioStream(void) {
+	PLINKED_BLOCKING_QUEUE_ENTRY entry, nextEntry;
+
+	entry = LbqDestroyLinkedBlockingQueue(&packetQueue);
+
+	while (entry != NULL) {
+		nextEntry = entry->next;
+		free(entry->data);
+		free(entry);
+		entry = nextEntry;
+	}
+}
+
+static void UdpPingThreadProc(void *context) {
+	char pingData[] = { 0x50, 0x49, 0x4E, 0x47 };
+	struct sockaddr_in saddr;
+	int err;
+
+	memset(&saddr, 0, sizeof(saddr));
+	saddr.sin_family = AF_INET;
+	saddr.sin_port = htons(RTP_PORT);
+	memcpy(&saddr.sin_addr, &remoteHost, sizeof(remoteHost));
+
+	while (!PltIsThreadInterrupted(&udpPingThread)) {
+		err = sendto(rtpSocket, pingData, sizeof(pingData), 0, (struct sockaddr*)&saddr, sizeof(saddr));
+		if (err != sizeof(pingData)) {
+			Limelog("UDP ping thread terminating #1\n");
+			return;
+		}
+
+		PltSleepMs(100);
+	}
+}
+
+static void ReceiveThreadProc(void* context) {
+	int err;
+
+	for (;;) {
+		char* buffer = (char*) malloc(1500 + sizeof(int));
+		if (buffer == NULL) {
+			Limelog("Receive thread terminating\n");
+			return;
+		}
+
+		err = recv(rtpSocket, &buffer[sizeof(int)], 1500, 0);
+		if (err <= 0) {
+			Limelog("Receive thread terminating #2\n");
+			free(buffer);
+			return;
+		}
+
+		memcpy(buffer, &err, sizeof(err));
+
+		err = LbqOfferQueueItem(&packetQueue, buffer);
+		if (err != LBQ_SUCCESS) {
+			free(buffer);
+		}
+
+		if (err == LBQ_BOUND_EXCEEDED) {
+			Limelog("Audio packet queue overflow\n");
+		}
+		else if (err == LBQ_INTERRUPTED) {
+			Limelog("Receive thread terminating #2\n");
+			return;
+		}
+	}
+}
+
+static void DecoderThreadProc(void* context) {
+	PRTP_PACKET rtp;
+	int length;
+	int err;
+	char *data;
+	unsigned short lastSeq = 0;
+
+	for (;;) {
+		err = LbqWaitForQueueElement(&packetQueue, (void**) &data);
+		if (err != LBQ_SUCCESS) {
+			Limelog("Decoder thread terminating\n");
+			return;
+		}
+
+		memcpy(&length, data, sizeof(int));
+		rtp = (PRTP_PACKET) &data[sizeof(int)];
+
+		if (length < sizeof(RTP_PACKET)) {
+			Limelog("Runt packet\n");
+			continue;
+		}
+
+		if (rtp->packetType != 97) {
+			// Not audio
+			continue;
+		}
+
+		rtp->sequenceNumber = htons(rtp->sequenceNumber);
+
+		if (lastSeq != 0 && (unsigned short) (lastSeq + 1) != rtp->sequenceNumber) {
+			Limelog("Received OOS audio data (expected %d, but got %d)\n", lastSeq + 1, rtp->sequenceNumber);
+
+			callbacks.decodeAndPlaySample(NULL, 0);
+		}
+
+		lastSeq = rtp->sequenceNumber;
+
+		callbacks.decodeAndPlaySample((char *) (rtp + 1), length - sizeof(*rtp));
+	}
+}
+
+void stopAudioStream(void) {
+	PltInterruptThread(&udpPingThread);
+	PltInterruptThread(&receiveThread);
+	PltInterruptThread(&decoderThread);
+
+	if (rtpSocket != INVALID_SOCKET) {
+		closesocket(rtpSocket);
+		rtpSocket = INVALID_SOCKET;
+	}
+
+	PltJoinThread(&udpPingThread);
+	PltJoinThread(&receiveThread);
+	PltJoinThread(&decoderThread);
+
+	PltCloseThread(&udpPingThread);
+	PltCloseThread(&receiveThread);
+	PltCloseThread(&decoderThread);
+}
+
+int startAudioStream(void) {
+	int err;
+
+	rtpSocket = bindUdpSocket(RTP_PORT);
+
+	err = PltCreateThread(UdpPingThreadProc, NULL, &udpPingThread);
+	if (err != 0) {
+		return err;
+	}
+
+	err = PltCreateThread(ReceiveThreadProc, NULL, &receiveThread);
+	if (err != 0) {
+		return err;
+	}
+
+	err = PltCreateThread(DecoderThreadProc, NULL, &decoderThread);
+	if (err != 0) {
+		return err;
+	}
+
+	callbacks.start();
+
+	return 0;
+}

limelight-common/Connection.c

@@ -6,12 +6,20 @@
 #define STAGE_HANDSHAKE 2
 #define STAGE_CONTROL_STREAM_INIT 3
 #define STAGE_VIDEO_STREAM_INIT 4
-#define STAGE_CONTROL_STREAM_START 5
-#define STAGE_VIDEO_STREAM_START 6
+#define STAGE_AUDIO_STREAM_INIT 5
+#define STAGE_CONTROL_STREAM_START 6
+#define STAGE_VIDEO_STREAM_START 7
+#define STAGE_AUDIO_STREAM_START 8
 
 static int stage = STAGE_NONE;
 
 void LiStopConnection(void) {
+	if (stage == STAGE_AUDIO_STREAM_START) {
+		Limelog("Stopping audio stream...");
+		stopAudioStream();
+		stage--;
+		Limelog("done\n");
+	}
 	if (stage == STAGE_VIDEO_STREAM_START) {
 		Limelog("Stopping video stream...");
 		stopVideoStream();
@@ -24,6 +32,12 @@ void LiStopConnection(void) {
 		stage--;
 		Limelog("done\n");
 	}
+	if (stage == STAGE_AUDIO_STREAM_INIT) {
+		Limelog("Cleaning up audio stream...");
+		destroyAudioStream();
+		stage--;
+		Limelog("done\n");
+	}
 	if (stage == STAGE_VIDEO_STREAM_INIT) {
 		Limelog("Cleaning up video stream...");
 		destroyVideoStream();
@@ -50,7 +64,8 @@ void LiStopConnection(void) {
 	LC_ASSERT(stage == STAGE_NONE);
 }
 
-int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECODER_RENDERER_CALLBACKS drCallbacks, void* renderContext, int drFlags) {
+int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECODER_RENDERER_CALLBACKS drCallbacks,
+	PAUDIO_RENDERER_CALLBACKS arCallbacks, void* renderContext, int drFlags) {
 	int err;
 
 	Limelog("Initializing platform...");
@@ -89,6 +104,12 @@ int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECO
 	LC_ASSERT(stage == STAGE_VIDEO_STREAM_INIT);
 	Limelog("done\n");
 
+	Limelog("Initializing audio stream...");
+	initializeAudioStream(host, arCallbacks);
+	stage++;
+	LC_ASSERT(stage == STAGE_AUDIO_STREAM_INIT);
+	Limelog("done\n");
+
 	Limelog("Starting control stream...");
 	err = startControlStream();
 	if (err != 0) {
@@ -109,6 +130,16 @@ int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECO
 	LC_ASSERT(stage == STAGE_VIDEO_STREAM_START);
 	Limelog("done\n");
 
+	Limelog("Starting audio stream...");
+	err = startAudioStream();
+	if (err != 0) {
+		Limelog("Audio stream start failed: %d\n", err);
+		goto Cleanup;
+	}
+	stage++;
+	LC_ASSERT(stage == STAGE_AUDIO_STREAM_START);
+	Limelog("done\n");
+
 Cleanup:
 	return err;
 }

limelight-common/Limelight-internal.h

@@ -28,3 +28,8 @@ void initializeVideoStream(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig,
 void destroyVideoStream(void);
 int startVideoStream(void* rendererContext, int drFlags);
 void stopVideoStream(void);
+
+void initializeAudioStream(IP_ADDRESS host, PAUDIO_RENDERER_CALLBACKS arCallbacks);
+void destroyAudioStream(void);
+int startAudioStream(void);
+void stopAudioStream(void);

limelight-common/Limelight.h

@@ -37,7 +37,22 @@ typedef struct _DECODER_RENDERER_CALLBACKS {
 	DecoderRendererSubmitDecodeUnit submitDecodeUnit;
 } DECODER_RENDERER_CALLBACKS, *PDECODER_RENDERER_CALLBACKS;
 
-int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECODER_RENDERER_CALLBACKS drCallbacks, void* renderContext, int drFlags);
+typedef void(*AudioRendererInit)(void);
+typedef void(*AudioRendererStart)(void);
+typedef void(*AudioRendererStop)(void);
+typedef void(*AudioRendererRelease)(void);
+typedef void(*AudioRendererDecodeAndPlaySample)(char* sampleData, int sampleLength);
+
+typedef struct _AUDIO_RENDERER_CALLBACKS {
+	AudioRendererInit init;
+	AudioRendererStart start;
+	AudioRendererStop stop;
+	AudioRendererRelease release;
+	AudioRendererDecodeAndPlaySample decodeAndPlaySample;
+} AUDIO_RENDERER_CALLBACKS, *PAUDIO_RENDERER_CALLBACKS;
+
+int LiStartConnection(IP_ADDRESS host, PSTREAM_CONFIGURATION streamConfig, PDECODER_RENDERER_CALLBACKS drCallbacks,
+	PAUDIO_RENDERER_CALLBACKS arCallbacks, void* renderContext, int drFlags);
 void LiStopConnection(void);
 
 #ifdef __cplusplus

limelight-common/limelight-common.vcxproj

@@ -130,6 +130,7 @@
     <Text Include="ReadMe.txt" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="AudioStream.c" />
     <ClCompile Include="ByteBuffer.c" />
     <ClCompile Include="Config.c" />
     <ClCompile Include="Connection.c" />

limelight-common/limelight-common.vcxproj.filters

@@ -48,6 +48,9 @@
     <ClCompile Include="VideoStream.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="AudioStream.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="PlatformSockets.h">