Record audio to file in sink mode and pay back as a source

[jmsunseri]

is it possible to create a file from the stream on a bluetooth sink in a format that can be played back when in source mode?

[pschatzmann]

Sure, it's both the same PCM format (as documented in the Readme) but you can't run the sink and source at the same time.

However, I would recommend to store them as WAV files so that you can play the files with any other audio player easily. For this I can recommend my AudioTools

[jmsunseri]

How do I go from a set_raw_stream_reader function on a ESP32 in sink mode to a wav file? The only think I have figured out right now was to print all the channel 1/2 values out to serial and then pipe that to a text file. The result has been just awful.

[pschatzmann]

You would normally write to a file on a sd drive.

You are crazy if you try to send this over Serial! Did you calculate the required Baud rate to send stereo 16 bit audio with a sampe rate of 44100 ?

You would need to downsample the signal first.

[jmsunseri]

I do not have and SD card attached to this ESP32 module, that would make a lot of sense though. This might explain why my results have been so poor. Assuming i add that on is there a good example in the wiki for taking the set_raw_stream_reader(const uint8_t *data, uint32_t frameCount) arguments and building a wav file?

[pschatzmann]

No, but just read the chaper about encoding that i povided above. Instead of calling copy, you would just call write with your data