the AAC problem. no audio after pause.

[josef2600]

when i use AAC decoder for Bluetooth, it works until i pause it, then there is no audi out, because you are closing the decoder and I2S stream. the AAC apparently doesn't work like SBC and the phone doesn't send the correct info to esp32 again, after pause or stop. i tried a fix, it is here. 2 files need changing.
i did NOT test SBC again, its on you! also, i am working on IDF 6.1 that has Arduino as a component. so, consider that too.

BluetoothA2DPSink.h.txt
BluetoothA2DPSink.cpp.txt

right now, it works for me.

[josef2600]

for more info:
in your BluetoothA2DPSink.cpp:
managed_decode_flush() — called on SUSPEND:
audio_decoder.close(); // ← decoder is closed here
managed_decode_start() — called on STARTED:

void BluetoothA2DPSink::managed_decode_start() {
  if (codec_decode_task_handle != nullptr) return;  // ← early return!
  ...
}

On the very first play:
AUDIO_CFG_EVT → handle_audio_cfg() → audio_decoder.apply_mcc() opens the decoder.
AUDIO_STATE STARTED → managed_decode_start() starts the task.
On pause:
AUDIO_STATE SUSPEND → managed_decode_flush() → audio_decoder.close()
On resume:
AUDIO_STATE STARTED → managed_decode_start() → early return (task already exists).

`No AUDIO_CFG_EVT` is sent by the phone on resume.
The decoder is never re-opened. Nothing gets decoded.

Fix — Re-open the Decoder on Resume.

the changes and comments added to the files i uploaded.

[pschatzmann]

I committed a correction: suspend is not closing the decoder any more, which is consistent with the currently implemented SBC logic