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+--- Thread: duplex audio over udp (/thread-543.html)
duplex audio over udp - Madammar - 08-03-2018
i use Tidtudpserver to send audio to clients i have something i do not understand from long time ago
when one client Send Audiodata to udpserver and udpserver send it back to clients every thing works fine and audio arrived good and clear
if 2 or 3 clients send audio at the same time the audio arrived un understandable and have too many cutting i wanted to make it a live conversation with duplex audio but i dont understand where is the problem is is it from idudpserver or from receiver side ?
here is the receiver side code
Code:
procedure TForm2.udpreciverUDPRead(AThread: TIdUDPListenerThread;
const AData: TIdBytes; ABinding: TIdSocketHandle);
var
AudioDataSize: Integer;
AudioData : Pointer;
begin
TThread.Synchronize(nil,
procedure
begin
AudioDataSize := Length(AData);
if (AudioDataSize > 10) then
begin
try
if not Player.Active then
begin
Player.Active := True;
Player.WaitForStart;
end;
except
end;
if BlockAlign > 1 then
begin
Dec(AudioDataSize, AudioDataSize mod BlockAlign);
end;
AudioData := AudioBuffer.BeginUpdate(AudioDataSize);
try
BytesToRaw(AData, AudioData^, AudioDataSize);
finally
AudioBuffer.EndUpdate;
end;
end else
begin
Player.Active := False;
Player.WaitForStop;
end;
end);
end;and here is the server side i have set multithreaded event to True
Code:
procedure TForm1.broadcatsaudio(ABinding: TIdSocketHandle; ipada : string; porta, serverprta : integer; const AData: TIdBytes);
var
AUDIOLIST : TAUDIOLIST;
c : integer;
List : Tlist;
begin
list := AllAUDIO.LockList;
try
for c := 0 to list.Count - 1 do
begin
AUDIOLIST := list.Items[c];
if (AUDIOLIST.userserverPort = serverprta)
And (AUDIOLIST.userport <> porta) then
begin
Abinding.SendTo(AUDIOLIST.userip, AUDIOLIST.userport, Adata);
end;
end;
finally
AllAUDIO.UnlockList;
end;
end;sorry for my bad grammar i am trying to describe what i am trying to do as best as i can
RE: duplex audio over udp - rlebeau - 08-03-2018
(08-03-2018, 04:08 PM)Madammar Wrote: if 2 or 3 clients send audio at the same time the audio arrived un understandable and have too many cutting i wanted to make it a live conversation with duplex audio but i dont understand where is the problem is is it from idudpserver or from receiver side ?
Well, for one thing, your receiver is synchronizing the entire OnUDPRead event handler, so you may as well have set udprecive.ThreadedEvent=False instead. But more importantly, not everything the event handler is doing needs to be synchronized at all. Do as much processing as you can inside the event handler itself, and synchronize only what is actually needed, like accessing the audio Player.
You might also consider using TThread.Queue() instead of TThread.Synchronize(), so that your event handler is not waiting on the Player on all, so the receiving of UDP packets and the playing of those packets occur in parallel, not in serial.
Try this:
Code:
procedure TForm2.udpreciverUDPRead(AThread: TIdUDPListenerThread;
const AData: TIdBytes; ABinding: TIdSocketHandle);
var
AudioDataSize: Integer;
begin
AudioDataSize := Length(AData);
if (AudioDataSize > 10) then
begin
if BlockAlign > 1 then
Dec(AudioDataSize, AudioDataSize mod BlockAlign);
TThread.Queue(nil,
procedure
var
AudioData : Pointer;
begin
try
if not Player.Active then
begin
Player.Active := True;
Player.WaitForStart;
end;
except
end;
AudioData := AudioBuffer.BeginUpdate(AudioDataSize);
try
BytesToRaw(AData, AudioData^, AudioDataSize);
finally
AudioBuffer.EndUpdate;
end;
end
);
end else
begin
TThread.Queue(nil,
procedure
begin
Player.Active := False;
Player.WaitForStop;
end
);
end;
end;RE: duplex audio over udp - Madammar - 08-04-2018
the queue helped to reduce some of cutting but i cannot mange it to make it work normally like a skype conversation the sound getting terribly bad and not understandable is it from the player it self ?
RE: duplex audio over udp - kudzu - 08-05-2018
You likely need to prebuffer more, and turn off nagle and do your own packet management. Streaming is very sensitive to any small delays.
RE: duplex audio over udp - Madammar - 08-05-2018
the streaming arrived altogether the sound is not delaying its like playing all together at the same time i think its the player it self that blocking the playing i dont know if iam right but its really hard to get it work