What does "0 hops" mean?

[codegrue]

I am playing WAV files off SPIFFS and after a few plays, I stop getting sound although the loop is happening and copier.copy() is getting called. The output shows something like this repeating indefinitely. The sounds seems to stop when it goes from "1 hops" to "0 hops":

...
[I] StreamCopy.h : 149 - StreamCopy::copy  1024 -> 1024 -> 1024 bytes - in 1 hops
[I] StreamCopy.h : 149 - StreamCopy::copy  1024 -> 1024 -> 1024 bytes - in 1 hops
[I] StreamCopy.h : 149 - StreamCopy::copy  24 -> 24 -> 24 bytes - in 1 hops
[I] StreamCopy.h : 149 - StreamCopy::copy  0 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 149 - StreamCopy::copy  0 -> 0 -> 0 bytes - in 0 hops
[I] StreamCopy.h : 149 - StreamCopy::copy  0 -> 0 -> 0 bytes - in 0 hops
... (repeats forever)

If I output the position and size of the WAV file, I can see that it never reaches the end of the file. wavFile.available() also shows as true when in this state so the wav file seems to not be "completing."

I'm not sure this is a bug or something I am doing wrong. I have tried the following code to "reset" the wav file between playthoughs.

        copier.end();
        wavFile.flush();
        wavFile.close();
        encoder.end();

[pschatzmann]

available() provides the number of bytes: what value do you get ?
I really expect that copy returns 0 bytes copied, when you are at the end...

[pschatzmann]

Do whatever is more convenient to you: I guess you would not hear any difference since the end of the audio usually just contains 0 values from fading out.

A wave file starts with a header of 44 bytes and if it is stereo 16 bits, a full frame of left and right data has 4 bytes: so your file seems to end with a left sample and the corresponding right sample is missing.

[codegrue]

Thank you for your help and this amazing library! The work you have put into this is very appreciated.

[z-l-p]

I thought you'd like to know that this solved a mysterious problem on my internet radio project: After upgrading the library, several internet radio streams would stop after a few seconds (with the same errors reported by codegrue).
setMinCopySize(1) on my copier restored everything to normal.

[pschatzmann]

Thanks for the feed-back: I changed the default setting to be 1

[z-l-p]

Confirmed that the new default in commit fb80700 works in my application. Thanks!