cabuhatprince / splmeter Goto Github PK

What steps will reproduce the problem?
1. execute the splmeter,and see the spl value(dB) was showed on screen.
2. exit splmeter
3. start splmeter again,but nothing was showed on screen

What is the expected output? What do you see instead?
if i restart the splmeter app,i should see the spl value.
But it didn't show it. 

What version of the product are you using? On what operating system?
splmeter 2.0 on HTC HERO

Please provide any additional information below.

According to Wikipedia[1] sound pressure in air (Pref) is 20 µPa = 0.00002 Pa, 
but in code other constant is used:

private static final double P0 = 0.000002;


[1] http://en.wikipedia.org/wiki/Sound_pressure#Sound_pressure_level

sometimes when i executed the splmeter,
the spl value will be not showing on the screen,
even exit the application,too

but sometimes execution correctly.


thanks!

[deleted issue]

 java.lang.NumberFormatException: -Infinity

please help

What steps will reproduce the problem?
1. Selecting slow mode does not seem to work
2.
3.

What is the expected output? What do you see instead?
No change in the response time


What version of the product are you using? On what operating system?
SPL V2.8, Droid2, System v2.3.20.A955, Android v2.2


Please provide any additional information below.

This is more of a solution than a bug report. Apologies for not sending a 
proper patch file.

This code base worked for me on my HTC Dream and Magic, but doesn't work 
properly in the emulators (lots of error logs), and doesn't report any audio at 
all for the nexus one.

This is using SVN checkout revision 32.

There are three main problems:
 1) The buffer size is too small (BUFFSIZE on line 48 of splEngine.java)
 2) A magic "8000" is passed into the AudioRecord constructor (line 350-351 of splEngine.java) where the buffer size should be used.
 3) The frequency should be 44100 for better accuracy (FREQUENCY on line 43 of splEngine.java)


1 - I'm not sure why this code works on the Dream and Magic, but it technically 
shouldn't. The buffer size of 320 is smaller than the required 4096 for those 
devices. It's also smaller than the value required by the emulators and the 
nexus one (640 and 8192 respectfully). This is solved by making the buffer size 
equal to:
AudioRecord.getMinBufferSize(FREQUENCY, CHANNEL, ENCODING);

2 - that 8000 should be the buffer size. This is why you don't get any audio 
information on the Nexus one. It requires at least 8192 for the buffer size, 
and the magic 8000 prevents the AudioRecord instance from being created 
properly.

3 - I'm guessing the reason you used the small buffer was to get more frequent 
polling. With a buffer size of 8192 and a frequency of 8000, you'd have more 
than a second delay in your audio processing. This can be rectified by changing 
the frequency to 44100 (which is also one of the values suggested by Google). 
There will still be a tiny delay, but it should be more than good enough.

I discovered these while writing a small audio capture test application that I 
based on your code. After these three modifications, my application ran on all 
devices I could throw it at without errors (Dream, Magic, Nexus one, and every 
emulator currently available in the SDK). It also updates faster and seems to 
give more accurate results.

Cheers, hope this helps

What steps will reproduce the problem?
1. Open Application
2. Go through calibration procedure
3. Exit Applicaiton
4. Start Application again

What is the expected output? What do you see instead?
I expect to see the same level I just calibrated.  Instead I see the
uncalibrated levels. 


What version of the product are you using? On what operating system?

SPL Meter Full Version 2.2  On Nexus One Android 2.1


Please provide any additional information below.

What steps will reproduce the problem?
1. Install from market (android 1.5, tmobile pulse)
2. Run application
3. It forces close

What is the expected output? What do you see instead?
Working application

What version of the product are you using? On what operating system?
whatever version is on market