Topic: automatic initialization through callback function after abnormal sound card

[dreamnyj]

Hello everyone.

I want to implement the function of automatically reconnecting after a sound card abnormality.

See a routine.

Demonstrating the use of Bass_ The Init function, the last parameter, passes in the callback function.

However, in the header file of Delphi, the defined parameters are not callback functions.


So I want to ask how to implement callback. Or is it true that the header file in Delphi is incomplete and can be added again according to VC's method?

Code: [Select]

delphi
procedure BASS_DeviceCallback(handle: HDSP; event: DWORD); stdcall;
begin
  if event = BASS_DEVICE_ERROR then 
  begin
    BASS_Free;                     
    BASS_Init(-1, 44100, 0, 0, nil);
  end;
end;

begin
                                        //===============
  BASS_Init(-1, 44100, 0, 0, @BASS_DeviceCallback); 
 
  ...
 
  BASS_Free;     
end;



[Ian @ un4seen]

The final BASS_Init parameter isn't for a callback function, so that code won't work, but you can detect when a device fails by setting a BASS_SYNC_DEV_FAIL sync (via BASS_ChannelSetSync) on a stream that's on the device. But also BASS will automatically try to recover/reinitialize from a device failure before triggering that sync, so trying to reinitialize in the callback is unlikely to succeed. You would generally just need to call BASS_Start to resume the device once it's available again, eg. when it's reconnected (if it was disconnected).

Note that the BASS_SYNC_DEV_FAIL sync's stream doesn't need to be playing for the sync to be triggered, but the device does need to be active for a failure to be detected, ie. you need to be playing something on the device or enable the BASS_CONFIG_DEV_NONSTOP option (via BASS_SetConfig).

[dreamnyj]

The final BASS_Init parameter isn't for a callback function, so that code won't work, but you can detect when a device fails by setting a BASS_SYNC_DEV_FAIL sync (via BASS_ChannelSetSync) on a stream that's on the device. But also BASS will automatically try to recover/reinitialize from a device failure before triggering that sync, so trying to reinitialize in the callback is unlikely to succeed. You would generally just need to call BASS_Start to resume the device once it's available again, eg. when it's reconnected (if it was disconnected).

Note that the BASS_SYNC_DEV_FAIL sync's stream doesn't need to be playing for the sync to be triggered, but the device does need to be active for a failure to be detected, ie. you need to be playing something on the device or enable the BASS_CONFIG_DEV_NONSTOP option (via BASS_SetConfig).

I used the recently popular AI for question based coding, and he gave me such an answer, which I am really at a loss. Thank you for the official response. I understand. Thank you.