public Sound(Stream input)
{
_input = input;
soundData = MP3Decoder.Initiate(input);
if (soundData == null)
{
throw new IOException("No MPEG data in the specified input stream!");
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException();
}
else if (offset < 0 || count < 0 || count > buffer.Length - offset)
{
throw new ArgumentOutOfRangeException();
}
else if (count == 0)
{
return(0);
}
if (index == -1)
{
return(-1);
}
int len_ = count;
while (count > 0)
{
if (index == soundData.samplesBuffer.Length)
{
if (!MP3Decoder.DecodeFrame(soundData))
{
index = -1;
soundData.samplesBuffer = null;
return(len_ == count ? -1 : len_ - count);
}
index = 0;
}
int remaining = soundData.samplesBuffer.Length - index;
if (remaining > 0)
{
if (remaining >= count)
{
Array.Copy(soundData.samplesBuffer, index, buffer, offset, count);
index += count;
return(len_);
}
Array.Copy(soundData.samplesBuffer, index, buffer, offset, remaining);
offset += remaining;
count -= remaining;
index = soundData.samplesBuffer.Length;
}
}
return(0);
}
public int Read()
{
if (index == -1)
{
return(-1);
}
if (index == soundData.samplesBuffer.Length)
{
if (!MP3Decoder.DecodeFrame(soundData))
{
index = -1;
soundData.samplesBuffer = null;
return(-1);
}
index = 1;
return(soundData.samplesBuffer[0] & 0xFF);
}
return(soundData.samplesBuffer[index++] & 0xFF);
}
public static void Main()
{
byte[] inBuffer = Resources.GetBytes(Resources.BinaryResources.testfile);
byte[] inDataPCM = new byte[1152 * 20]; /*Resources.GetBytes(Resources.BinaryResources.test)*/;
byte[][] inBufferPCM = new byte[inDataPCM.Length / 1152][];
for (int i = 0; i < inBufferPCM.Length; i++)
{
inBufferPCM[i] = new byte[1152];
Array.Copy(inDataPCM, i * 1152, inBufferPCM[i], 0, 1152);
}
MP3Decoder hMP3Decoder;
DAC hDAC = new DAC();
/*
* Debug.Print("PCM Output Test");
* hDAC.Initialize(8000);
*
* for (int i = 0; i < inBufferPCM.Length; i++)
* {
* try
* {
* //Debug.Print("Frame "+i+":");
* //for (int j = 0; j < 1152; j++)
* //{
* // inBufferPCM[j] = inDataPCM[1152*i+j];
* //}
*
* hDAC.AddFrame(inBufferPCM[i], 576);
* //Debug.Print("BUFlvl="+hDAC.GetBufferLevel());
* }
* catch (System.Exception)
* {
* if (!hDAC.Enabled)
* {
* hDAC.On();
* }
* //i--;//don't skip this frame without adding it
* //System.Threading.Thread.Sleep(72);//sleep one frame time (at 8kHz)
* }
* }
*
* System.DateTime outputBeginPCM = System.DateTime.Now;
*
* while (hDAC.GetBufferLevel() > 0)
* {
* System.Threading.Thread.Sleep(50);
* Debug.Print("Buffer fill level " + hDAC.GetBufferLevel());
* }
* System.TimeSpan outputRunningTimePCM = System.DateTime.Now.Subtract(outputBeginPCM);
* Debug.Print("PCM Output Over, took " + outputRunningTimePCM.Milliseconds + "ms");
*
* hDAC.Off();
* hDAC.Uninitialize();*/
Debug.Print("MP3TestApp INIT...");
/*GPIOButtonInputProvider inputProvider = new GPIOButtonInputProvider(null);
*
* Microsoft.SPOT.Presentation.Window a = new Window();
* a.AddHandler(Buttons.ButtonUpEvent, new ButtonEventHandler(OnButtonUp), false);
*/
hMP3Decoder = new MP3Decoder(inBuffer);
hDAC.Initialize(8000);
Int16 maxFrames;
hDAC.On();
while (true)
{
//fill the buffer
maxFrames = (short)hDAC.GetBufferFrameCapacity();
try
{
//Debug.Print("Decode & play");
hMP3Decoder.Decode(ref maxFrames, 5);
if (maxFrames > 0) //no more frames to decode in inBuffer
{
Debug.Print("Decoding over");
break;
}
//Debug.Print("FRAMES LEFT: " + hDAC.GetFramesLeft());
}
catch (NXP.Interop.DecodingException)
{
Debug.Print("Generic DecodingException, abort.");
break;
}
catch (System.Exception)
{
Debug.Print("Generic exception, abort.");
break;
}
} //while
Int16 sleeptime = 2 * 1000;
Debug.Print("Wait: " + sleeptime);
System.Threading.Thread.Sleep(sleeptime);
hDAC.Uninitialize();
}
