/// <summary>Returns a byte array containing 16-bit signed samples for the specified speaker sound.</summary>
/// <param name="speakerSound">The speaker sound.</param>
/// <param name="soundsPointer">The speaker sounds pointer.</param>
/// <param name="sampleFrequency">The sample frequency in Hz.</param>
/// <param name="amplitude">The peak amplitude (0 to 1).</param>
/// <returns>A byte array.</returns>
public static byte[] GetSpeakerSamplesS16(spksndtype speakerSound, memptr soundsPointer, double sampleFrequency, double amplitude)
{
soundsPointer.Offset(speakerSound.start);
PCSpeaker pcSpeaker = new PCSpeaker(sampleFrequency, amplitude);
// as: Added checks to catch problems with SOUNDS.HOV files (Demon Hunter v1.1):
// Also, the maximum sample time has been limited to 10s
// and: sound generation stops if the end of the soundsPointer buffer is reached
double time = 1.0 / spksndtype.Frequency(0x2147);
ushort timerValue = soundsPointer.GetUInt16(0);
double maxTime = 10.0;
while(timerValue != spksndtype.SpeakerData_EndSound)
{
pcSpeaker.SetTimer((ushort) timerValue);
pcSpeaker.WriteSamples(time);
soundsPointer.Offset(2);
if(soundsPointer.BaseIndex + 1 >= soundsPointer.Buffer.Length)
break;
timerValue = soundsPointer.GetUInt16(0);
if(pcSpeaker.ElapsedTime > maxTime)
break;
}
return pcSpeaker.ToArray();
}
/// <summary>Returns a byte array containing samples (Mono 16-bit Signed) for the intro sound.</summary>
/// <param name="sampleFrequency">The sample frequency in Hz.</param>
/// <param name="amplitude">The peak amplitude (0 to 1).</param>
/// <returns>A byte array.</returns>
public static byte[] CreateIntroSoundSamplesS16(double sampleFrequency, double amplitude)
{
PCSpeaker pcSpeaker = new PCSpeaker(sampleFrequency, amplitude);
// from HOVMAIN.C:Intro
float NUMFRAMES = 300.0f;
float MAXANGLE = (3.141592657f * 0.6f);
short f = 1;
do
{
float step = f / NUMFRAMES;
float angle = MAXANGLE * step;
float sn = (float) Math.Sin(angle);
int frequency = (int) (sn * 1500);
pcSpeaker.SetFrequency(frequency);
pcSpeaker.WriteSamples(1.0 / 140.0);
f++;
} while(f <= NUMFRAMES);
return pcSpeaker.ToArray();
}
