I am using the length of my PCM data buffer to calculate the number of
frames; depending if its mono or stereo or 8bit or 16bit.
For example, if it is a mono/8bit then the number of frames is the
length of the buffer. if it is stereo/16bit the number of frames is
the length / 4.
The problem is that the buffer, I create by reading the PCM raw
resource (file), seems to be too long (look below) . Therefore the
number of frames is also too heigh. why am I getting the buffer longer
then it should be?
there is another way to calculate the number of frames;
Number of Frames = <Sample Rate> * <duration of the PCM sample in [ms]
>
for example 11.025[kHz] * 4000 [ms] = 44100 [frames]
the above calculations should yield the same result, yet they don’t
(the problem is with the buffer length). I am certain that the second
result is correct. am I doing something wrong with the way I read in
the data? I should put it into the WHILE loop when reading. But that’s
not it.
Here is how I create the buffer;
private byte[] readResource (int resourceId)
{
InputStream inputStream = null;
byte[] inputBuffer = null;
try
{
inputStream = _Context.getResources().openRawResource
(resourceId);
inputBuffer = new byte [inputStream.available()];
inputStream.read(inputBuffer);
}
catch (IOException e)
{
Log.e(this.getClass().getName(), String.format("readResource:
Exception: %s", e.getMessage()));
}
finally
{
try
{
inputStream.close();
}
catch (IOException e)
{
Log.e(this.getClass().getName(), String.format
("readResource: Exception: %s", e.getMessage()));
}
}
return inputBuffer;
}
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