- Apply parts of Ben Millwood's target bitfield patch (#3787)

- Fix Ryan's FIXME and have voip packet buffer on the server dynamically allocated via Z_Malloc and store pointers in a circular buffer
- Improve voip target parsing on top of Ben Millwood's patch
- Add new "spatial" target where speaker is spatialized in 3d space and can be heard by all clients in hearing range (s_alMaxDistance)
  (#4467)
- Decrease voip sound lengths from 240ms to 80ms per voip packet to mitigate udp packet loss and decrease latency
- Protocol version incremented to 71

code/qcommon/common.c

@@ -3585,3 +3585,33 @@ void Com_RandomBytes( byte *string, int len )
 		string[i] = (unsigned char)( rand() % 255 );
 }
 
+
+/*
+==================
+Com_IsVoipTarget
+
+Returns non-zero if given clientNum is enabled in voipTargets, zero otherwise.
+If clientNum is negative return if any bit is set.
+==================
+*/
+qboolean Com_IsVoipTarget(uint8_t *voipTargets, int voipTargetsSize, int clientNum)
+{
+	int index;
+	if(clientNum < 0)
+	{
+		for(index = 0; index < voipTargetsSize; index++)
+		{
+			if(voipTargets[index])
+				return qtrue;
+		}
+		
+		return qfalse;
+	}
+
+	index = clientNum >> 3;
+	
+	if(index < voipTargetsSize)
+		return (voipTargets[index] & (1 << (clientNum & 0x07)));
+
+	return qfalse;
+}

code/qcommon/q_shared.h

@@ -928,6 +928,23 @@ typedef struct {
 	char		string[MAX_CVAR_VALUE_STRING];
 } vmCvar_t;
 
+
+/*
+==============================================================
+
+VoIP
+
+==============================================================
+*/
+
+// if you change the count of flags be sure to also change VOIP_FLAGNUM
+#define VOIP_SPATIAL		0x01		// spatialized voip message
+#define VOIP_DIRECT		0x02		// non-spatialized voip message
+
+// number of flags voip knows. You will have to bump protocol version number if you
+// change this.
+#define VOIP_FLAGCNT		2
+
 /*
 ==============================================================
 

code/qcommon/qcommon.h

@@ -252,7 +252,7 @@ PROTOCOL
 ==============================================================
 */
 
-#define	PROTOCOL_VERSION	70
+#define	PROTOCOL_VERSION	71
 #define PROTOCOL_LEGACY_VERSION	68
 // 1.31 - 67
 
@@ -834,6 +834,8 @@ int			Com_RealTime(qtime_t *qtime);
 qboolean	Com_SafeMode( void );
 void		Com_RunAndTimeServerPacket(netadr_t *evFrom, msg_t *buf);
 
+qboolean	Com_IsVoipTarget(uint8_t *voipTargets, int voipTargetsSize, int clientNum);
+
 void		Com_StartupVariable( const char *match );
 // checks for and removes command line "+set var arg" constructs
 // if match is NULL, all set commands will be executed, otherwise