internal static int SilenceNoise(BusyToneState state, short [] data)
{
int res;
int accum;
int x;
int i;
int j;
int k;
res = 0;
if (data.Length < 1)
{
return(res);
}
accum = 0;
for (x = 0; x < data.Length; ++x)
{
accum += Math.Abs(data [x]);
}
accum /= data.Length;
if (accum < state.Threshold)
{
state.TotalSilence += data.Length / 8;
if (state.TotalNoise > 0)
{
for (i = state.DspHistory - state.BusyCount,
j = i + 1,
k = 0;
k < state.BusyCount;
++i, ++j, ++k)
{
state.HistoricNoise [i] = state.HistoricNoise [j];
}
state.HistoricNoise [state.DspHistory - 1] = state.TotalNoise;
}
state.TotalNoise = 0;
res = 1;
}
else
{
state.TotalNoise += data.Length / 8;
if (state.TotalSilence > 0)
{
int silence1;
int silence2;
silence1 = state.HistoricSilence [state.DspHistory - 1];
silence2 = state.HistoricSilence [state.DspHistory - 2];
for (i = state.DspHistory - state.BusyCount,
j = i + 1,
k = 0;
k < state.BusyCount;
++i, ++j, ++k)
{
state.HistoricSilence [i] = state.HistoricSilence [j];
}
state.HistoricSilence [state.DspHistory - 1] = state.TotalSilence;
if (silence1 < silence2)
{
if (silence1 + silence1 * (int)BusyDetectDef.BUSY_PERCENT / 100 >= silence2)
{
state.BusyMaybe = 1;
}
else
{
state.BusyMaybe = 0;
}
}
else
{
if (silence1 - silence1 * (int)BusyDetectDef.BUSY_PERCENT / 100 <= silence2)
{
state.BusyMaybe = 1;
}
else
{
state.BusyMaybe = 0;
}
}
}
state.TotalSilence = 0;
}
return(res);
}
internal static int SilenceNoise( BusyToneState state, short [] data )
{
int res;
int accum;
int x;
int i;
int j;
int k;
res = 0;
if( data.Length < 1 )
{
return res;
}
accum = 0;
for( x = 0; x < data.Length; ++x )
{
accum += Math.Abs( data [x] );
}
accum /= data.Length;
if( accum < state.Threshold )
{
state.TotalSilence += data.Length / 8;
if( state.TotalNoise > 0 )
{
for( i = state.DspHistory - state.BusyCount,
j = i + 1,
k = 0;
k < state.BusyCount;
++i, ++j, ++k )
{
state.HistoricNoise [i] = state.HistoricNoise [j];
}
state.HistoricNoise [state.DspHistory - 1] = state.TotalNoise;
}
state.TotalNoise = 0;
res = 1;
}
else
{
state.TotalNoise += data.Length / 8;
if( state.TotalSilence > 0 )
{
int silence1;
int silence2;
silence1 = state.HistoricSilence [state.DspHistory - 1];
silence2 = state.HistoricSilence [state.DspHistory - 2];
for( i = state.DspHistory - state.BusyCount,
j = i + 1,
k = 0;
k < state.BusyCount;
++i, ++j, ++k )
{
state.HistoricSilence [i] = state.HistoricSilence [j];
}
state.HistoricSilence [state.DspHistory - 1] = state.TotalSilence;
if( silence1 < silence2 )
{
if( silence1 + silence1 * (int)BusyDetectDef.BUSY_PERCENT / 100 >= silence2 )
{
state.BusyMaybe = 1;
}
else
{
state.BusyMaybe = 0;
}
}
else
{
if( silence1 - silence1 * (int)BusyDetectDef.BUSY_PERCENT / 100 <= silence2 )
{
state.BusyMaybe = 1;
}
else
{
state.BusyMaybe = 0;
}
}
}
state.TotalSilence = 0;
}
return res;
}
internal static int Detect(BusyToneState state)
{
int res;
int x;
int avgsilence;
int hitsilence;
int avgtone;
int hittone;
res = 0;
avgsilence = 0;
hitsilence = 0;
avgtone = 0;
hittone = 0;
if (state.BusyMaybe == 0)
{
return(res);
}
for (x = state.DspHistory - state.BusyCount; x < state.DspHistory; ++x)
{
avgsilence += state.HistoricSilence [x];
avgtone += state.HistoricNoise [x];
}
avgsilence /= state.BusyCount;
avgtone /= state.BusyCount;
for (x = state.DspHistory - state.BusyCount; x < state.DspHistory; ++x)
{
if (avgsilence > state.HistoricNoise [x])
{
if (avgsilence - (avgsilence * (int)BusyDetectDef.BUSY_PERCENT / 100) <= state.HistoricSilence [x])
{
hitsilence++;
}
}
else if (avgsilence + (avgsilence * (int)BusyDetectDef.BUSY_PERCENT / 100) >= state.HistoricSilence [x])
{
hitsilence++;
}
if (avgtone > state.HistoricNoise [x])
{
if (avgtone - (avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100) <= state.HistoricNoise [x])
{
hittone++;
}
}
else if (avgtone + (avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100) >= state.HistoricNoise [x])
{
hittone++;
}
}
//this is the 'tone only' code
//if( (hittone > state.BusyCount - 1 ) && (hitsilence >= state.BusyCount - 1) &&
// (avgtone >= BusyDetectDef.BUSY_MIN && avgtone <= BusyDetectDef.BUSY_MAX))
if ((hittone >= state.BusyCount - 1) && (avgtone >= (int)BusyDetectDef.BUSY_MAX &&
avgtone <= (int)BusyDetectDef.BUSY_MAX))
{
if (avgtone > avgsilence)
{
if (avgtone - avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100 <= avgsilence)
{
res = 1;
}
}
else
{
if (avgtone + avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100 >= avgsilence)
{
res = 1;
}
}
}
if ((res > 0) && (state.BusyToneLength > 0))
{
if (Math.Abs(avgtone - state.BusyToneLength) >
(state.BusyToneLength * (int)BusyDetectDef.BUSY_PAT_PERCENT / 100))
{
res = 0;
}
}
if ((res > 0) && (state.BusyQuietLength > 0))
{
if (Math.Abs(avgsilence - state.BusyQuietLength) >
(state.BusyQuietLength * (int)BusyDetectDef.BUSY_PAT_PERCENT / 100))
{
res = 0;
}
}
return(res);
}
internal static int Detect( BusyToneState state )
{
int res;
int x;
int avgsilence;
int hitsilence;
int avgtone;
int hittone;
res = 0;
avgsilence = 0;
hitsilence = 0;
avgtone = 0;
hittone = 0;
if( state.BusyMaybe == 0 )
{
return res;
}
for( x = state.DspHistory - state.BusyCount; x < state.DspHistory; ++x )
{
avgsilence += state.HistoricSilence [x];
avgtone += state.HistoricNoise [x];
}
avgsilence /= state.BusyCount;
avgtone /= state.BusyCount;
for( x = state.DspHistory - state.BusyCount; x < state.DspHistory; ++x )
{
if( avgsilence > state.HistoricNoise [x] )
{
if( avgsilence - ( avgsilence * (int)BusyDetectDef.BUSY_PERCENT / 100 ) <= state.HistoricSilence [x] )
{
hitsilence++;
}
}
else if( avgsilence + ( avgsilence * (int)BusyDetectDef.BUSY_PERCENT / 100 ) >= state.HistoricSilence [x] )
{
hitsilence++;
}
if( avgtone > state.HistoricNoise [x] )
{
if( avgtone - ( avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100 ) <= state.HistoricNoise [x] )
{
hittone++;
}
}
else if( avgtone + ( avgtone * (int)BusyDetectDef.BUSY_PERCENT / 100 ) >= state.HistoricNoise [x] )
{
hittone++;
}
}
//this is the 'tone only' code
//if( (hittone > state.BusyCount - 1 ) && (hitsilence >= state.BusyCount - 1) &&
// (avgtone >= BusyDetectDef.BUSY_MIN && avgtone <= BusyDetectDef.BUSY_MAX))
if( (hittone >= state.BusyCount - 1 ) && (avgtone >= (int)BusyDetectDef.BUSY_MAX &&
avgtone <= (int)BusyDetectDef.BUSY_MAX))
{
if( avgtone > avgsilence )
{
if( avgtone - avgtone * (int)BusyDetectDef.BUSY_PERCENT/100 <= avgsilence )
res = 1;
}
else
{
if( avgtone + avgtone * (int)BusyDetectDef.BUSY_PERCENT/100 >= avgsilence )
{
res = 1;
}
}
}
if( (res > 0) && (state.BusyToneLength > 0) )
{
if( Math.Abs( avgtone - state.BusyToneLength) >
(state.BusyToneLength*(int)BusyDetectDef.BUSY_PAT_PERCENT/100))
{
res = 0;
}
}
if( (res > 0) && (state.BusyQuietLength > 0) )
{
if( Math.Abs( avgsilence - state.BusyQuietLength) >
(state.BusyQuietLength*(int)BusyDetectDef.BUSY_PAT_PERCENT/100))
{
res = 0;
}
}
return res;
}