REW Beta Release REW API beta releases

[John Mulcahy]

in Overlays window you cannot select tab with keyboard shortcut (Ctrl + "number").

Thanks, I have fixed that for the next build.

 

[thothsong]

Added: The SPL & Phase graph has an option to show the musical note corresponding to the cursor frequency

Nice!

 

[John Mulcahy]

Builds updated today (beta 44) with these changes:

• Added: Measurement groups can be assigned a colour
• Added: Clicking on the Max SPL figure at the bottom of the main REW window will open the cal settings panel for the input
• Changed: New measurement group dialog allows notes and colour to be specified when creating the group
• Changed: Use a subscript for the musical note octave when using American notation
• Changed: Sample format info in the status bar includes the buffer size when using ASIO
• Fixed: Graph selection shortcuts did not work on the Overlays windows when focus was on the measurements list
• Fixed: Sample rate was only shown in the status bar when it changed
• Fixed: IllegalArgumentException when selecting a group

 

[krizma]

Is it possible to perform measurements in the standard version of REW via API? Or is this feature only available in the Pro version?

 

[John Mulcahy]

Is it possible to perform measurements in the standard version of REW via API? Or is this feature only available in the Pro version?

Sweep measurements via the API requires a Pro upgrade. It's mainly used by manufacturers for automated test.

 

[serko70]

Would it be possible to run multiple REW instances in AWS as is and or would it require major changes to install?
I am totally lost in multiple AWS methods and documentation regarding something like this.

 

[John Mulcahy]

Would it be possible to run multiple REW instances in AWS as is and or would it require major changes to install?

No idea, sorry.

 

[Dr.OP]

Would it be possible to run multiple REW instances in AWS as is and or would it require major changes to install?
I am totally lost in multiple AWS methods and documentation regarding something like this.

A very rough idea. It would require some manual startup.
- spin up a Linux distro
- setups multiple users
- install rew for each user locally
- start rew api server for each user session on a different port
- call rew api from the server


In this setup each rew instance is insulated in its own user space with individual rew settings.

I have no experience with AWS so I’m not sure how you can call it from anywhere. If you can get a unique server url it will solve the problem.

 

[serko70]

A very rough idea. It would require some manual startup.
- spin up a Linux distro
- setups multiple users
- install rew for each user locally
- start rew api server for each user session on a different port
- call rew api from the server


In this setup each rew instance is insulated in its own user space with individual rew settings.

I have no experience with AWS so I’m not sure how you can call it from anywhere. If you can get a unique server url it will solve the problem.

AWS seem to be more than capable to do this but the methods seem to have changed regularly with different and confusing instructions for each. It would be nice to access REW API features remotely from a mobile phone however even if John permits this and we can achieve to run it smoothly, I guess there would still be significant CPU time charges from AWS.

 

[John Mulcahy]

It would be nice to access REW API features remotely from a mobile phone

REW's API is only accessible locally on the machine to avoid security issues. To access it remotely you would need to install some intermediate application of your own which provides external access.

 

[Urfa]

Hi,

A newbie here, so beg I a pardon for silly questions...

What is the correct sequence to interpret data you get from /measurements/:id/frequency-response request, so it looks similar to the data you get from export:
Ex.:
* Freq(Hz) SPL(dB) Phase(degrees)
50.170898 71.805 -99.2510
50.534457 71.894 -99.5247

Decode Base64 => Convert bytes to float => xxx ?

 

[Urfa]

Oh man, it's already described in the API documentation. I need to consider eyesight check

Array encoding​

Arrays are transferred as Base64-encoded strings generated from the raw bytes of the 32-bit float sample values. Base64 decoding is well supported in programming languages, here is how to recover the arrays in Java:

public static float[] decodeArray(String base64Encoded) {
return byteToFloatArray(Base64.getDecoder().decode(base64Encoded));
}

private static float[] byteToFloatArray(byte[] bytes) {
FloatBuffer buf = ByteBuffer.wrap(bytes).asFloatBuffer();
float[] floatArray = new float[buf.limit()];
buf.get(floatArray);
return floatArray;
}

One more little question - how to acquire corresponding frequency besides the magnitude and the phase?

 

[John Mulcahy]

One more little question - how to acquire corresponding frequency besides the magnitude and the phase?

The FrequencyResponse object returned has a start frequency (the frequency of the first point in the array) and either a points per octave figure for log spaced data or a frequency step figure for linearly spaced data to determine the frequency for subsequent points. For log data the frequency at any index (starting from index 0) is

double freq = startFreq*Math.exp(index*Math.log(2)/PPO)

 

[Urfa]

Thanks! Worked like a charm.

 

[John Mulcahy]

Builds updated today (beta 45) with these changes:

• Changed: Use frequency-dependent windows to reduce the noise floor of sweep distortion measurements
• Fixed: Index out of bounds when saving an RTA peak measurement with multiple inputs and group averages enabled

The windowing change for distortion results prevents the rising noise floor with frequency that previously occurred, substantially lowering the noise floor.

 

[John Mulcahy]

Builds updated today (beta 46) with these changes:

• Added: A new group can be generated from the Measure dialog
• Fixed: Long group names could disrupt the Measure dialog layout
• Fixed: Sweep distortion noise floor could be plotted too high

 

[thothsong]

Is there a reason why the Make group from filenames option isn't available in All SPL?

 

[John Mulcahy]

Is there a reason why the Make group from filenames option isn't available in All SPL?

Just to avoid repetition, the option is independent of which graph is displayed.

 

[Breeman]

Hi John,

Is there a way to toggle the black, phase response graph on or off within the Alignment Tool?

 

[John Mulcahy]

Is there a way to toggle the black, phase response graph on or off within the Alignment Tool?

No, but I can add one in the next build.

 

[Breeman]

No, but I can add one in the next build.

Thanks John

 

[serko70]

No, but I can add one in the next build.

Can you also add the new "Better delay" metric shown in Alignment tool to alignment-tool/result API?

 

[John Mulcahy]

Can you also add the new "Better delay" metric shown in Alignment tool to alignment-tool/result API?

I will return it as part of the "delay too large" error message.

 

[thothsong]

Dragging a measurement to rearrange the order doesn't seem to work when it's in a group; is that intentional?

 

[John Mulcahy]

Dragging a measurement to rearrange the order doesn't seem to work when it's in a group; is that intentional?

Seems to work fine for me. Which graph are you viewing? Have you selected just one measurement to move or are other measurements in the group selected?