REW Beta Release REW API beta releases

John Mulcahy · Jul 22, 2024

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

Thanks, I have fixed that for the next build.

thothsong · Jul 23, 2024

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

Nice!

John Mulcahy · Jul 24, 2024

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 · Jul 24, 2024

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 · Jul 24, 2024

krizma said:
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 · Jul 24, 2024

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 · Jul 24, 2024

serko70 said:
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 · Jul 24, 2024

serko70 said:
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 · Jul 25, 2024

Dr.OP said:
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 · Jul 25, 2024

serko70 said:
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 · Jul 26, 2024

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 · Jul 26, 2024

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

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 · Jul 26, 2024

Urfa said:
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

Code:

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

Urfa · Jul 26, 2024

Thanks! Worked like a charm.

John Mulcahy · Jul 27, 2024

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 · Jul 28, 2024

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 · Jul 28, 2024

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

John Mulcahy · Jul 28, 2024

thothsong said:
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 · Jul 29, 2024

Hi John,

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

John Mulcahy · Jul 30, 2024

Breeman said:
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 · Jul 30, 2024

John Mulcahy said:
No, but I can add one in the next build.

Thanks John

serko70 · Jul 31, 2024

John Mulcahy said:
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 · Jul 31, 2024

serko70 said:
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 · Jul 31, 2024

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

John Mulcahy · Jul 31, 2024

thothsong said:
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?

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