moonlight-stream/moonlight-common-c
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Add protocol extension for multi-client-compatible ping support

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Cameron Gutman
2023-02-12 01:23:25 -06:00
parent 5e14dbc15e
commit dc186082a7
6 changed files with 54 additions and 19 deletions
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26
src/AudioStream.c
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@@ -41,8 +41,7 @@ typedef struct _QUEUED_AUDIO_PACKET {
} QUEUED_AUDIO_PACKET, *PQUEUED_AUDIO_PACKET;
static void AudioPingThreadProc(void* context) {
// Ping in ASCII
char pingData[] = { 0x50, 0x49, 0x4E, 0x47 };
char legacyPingData[] = { 0x50, 0x49, 0x4E, 0x47 };
LC_SOCKADDR saddr;
LC_ASSERT(AudioPortNumber != 0);
@@ -50,19 +49,20 @@ static void AudioPingThreadProc(void* context) {
memcpy(&saddr, &RemoteAddr, sizeof(saddr));
SET_PORT(&saddr, AudioPortNumber);
// Send PING every 500 milliseconds
// We do not check for errors here. Socket errors will be handled
// on the read-side in ReceiveThreadProc(). This avoids potential
// issues related to receiving ICMP port unreachable messages due
// to sending a packet prior to the host PC binding to that port.
int pingCount = 0;
while (!PltIsThreadInterrupted(&udpPingThread)) {
// We do not check for errors here. Socket errors will be handled
// on the read-side in ReceiveThreadProc(). This avoids potential
// issues related to receiving ICMP port unreachable messages due
// to sending a packet prior to the host PC binding to that port.
sendto(rtpSocket, pingData, sizeof(pingData), 0, (struct sockaddr*)&saddr, RemoteAddrLen);
if (AudioPingPayload.payload[0] != 0) {
pingCount++;
AudioPingPayload.sequenceNumber = BE32(pingCount);
if (firstReceiveTime == 0 && isSocketReadable(rtpSocket)) {
// Remember the time when we got our first incoming audio packet.
// We will need to adjust for the delay between this event and
// when the real receive thread is ready to avoid falling behind.
firstReceiveTime = PltGetMillis();
sendto(rtpSocket, (char*)&AudioPingPayload, sizeof(AudioPingPayload), 0, (struct sockaddr*)&saddr, RemoteAddrLen);
}
else {
sendto(rtpSocket, legacyPingData, sizeof(legacyPingData), 0, (struct sockaddr*)&saddr, RemoteAddrLen);
}
PltSleepMsInterruptible(&udpPingThread, 500);