SD/Bluetooth Audio Help

[amikulics]

Hi Everyone, I am trying to make a device that can play both audio from bluetooth or audio from an SD card and switch between these sources at the press of a button.

I have been using pschatzmann's library for Bluetooth and this has worked well. I am also using Arduino-Audio-Tools for SD card playback but this has given me some trouble.

Currently I have issues switching between these sources. That is, it starts in BT mode by default and I can switch between BT and SD without issue, but if a BT device is connected then it will crash upon switching. This crash is accompanied by malloc errors in console and a register dump. I am able to start in BT mode and play music, only switching between BT/SD after a BT device is connected causes the crash.

The code uses a basic state machine with a playbackMode variable. This is setup so BT or SD will have an initialization stage before the main loop code runs. The stages are split up in if blocks like "currentState == initBluetooth" in handleBluetooth() and handleSDcard().

I think there is an issue with some of the BT variables not being deinitialized or reinitialized correctly but my experiments have not yielded much. I will include pastebin links to my source and error output. The code I linked is a simplified version and not very polished but includes all the same BT/SD parts.

If anyone has any experience or suggestion for this, please comment!

Thanks for reading!

Error: https://pastebin.com/pvLTvDbW
Source: https://pastebin.com/t3TeA8Uy
Header: https://pastebin.com/AgK4mYjK

[jsonslim]

I have the same issue. I'm trying to implement the bluetooth sink and mp3 player from files. ANd I have the similar problem - when switching from mp3 player to BT sink, it crashes, or just sometimes can connect to BT transmitter, but without any audio output.
There were a discussion(espressif/esp-idf#11642), that it's impossible to restart BT sink in the runtime. But maybe there are some workarounds...

[pschatzmann]

You can get pretty far with PSRAM...
If you need to release the Bluetooth resources, just reboot with ESP.restart()

[jsonslim]

Rebooting seems like a too extreme approach.
What do you mean by "pretty far"?

[amikulics]

I have the same issue. I'm trying to implement the bluetooth sink and mp3 player from files. ANd I have the similar problem - when switching from mp3 player to BT sink, it crashes, or just sometimes can connect to BT transmitter, but without any audio output. There were a discussion(espressif/esp-idf#11642), that it's impossible to restart BT sink in the runtime. But maybe there are some workarounds...

I was able to get further following this example: https://github.com/pschatzmann/arduino-audio-tools/blob/cc0fbb7da596824596d763d223550ba7c6c7d665/examples/examples-communication/a2dp/player-sd_a2dp-audiokit/player-sd_a2dp-audiokit.ino

This allowed me to switch between sources without rebooting.
I kept my state machine code and used similar calls to what was done in above example. I think starting and stopping the i2s stream was a big part of the issue.

[pschatzmann]

I'd be surprised if you would run out of Memory with PSRAM....