ALSA devices : struct input_port/output_port are differents from observer's added/removed

[obook]

Hello.

The device name is not removed then unpluged (USB) in example/gui.

41  if (auto it = input_items.find(p); it != input_items.end())  // Failed, device not found

53  if (auto it = output_items.find(p); it != output_items.end()) // Failed, device not found

With some debug messages :

input_added device_name=[Arturia KeyLab Essential 61] display_name=[Arturia KeyLab Essential 61 MID]
input_added device_name=[Arturia KeyLab Essential 61] display_name=[Arturia KeyLab Essential 61 DAW]
input_removed NOT FOUND device_name=[Arturia KeyLab Essential 61] display_name=[Arturia KeyLab Essential 61 MID]
input_removed NOT FOUND device_name=[Arturia KeyLab Essential 61] display_name=[Arturia KeyLab Essential 61 DAW] 

Thank you for your help.
Regards.

[obook]

Hello.

Same problem in midiobserve.

With ALSA API, input_port/output_port p is not the same between input and output observer added/removed. So p can not be found in map by find(p). No problem with PipeWire API.

Example

static std::map<libremidi::input_port, std::string_view> ports_input; // port, api_name
static std::map<libremidi::output_port, std::string_view> ports_output; // port, api_name

Keyboard Arturia Keystep 37 plugged

Port INPUT ALSA (sequencer) added to map : [ client: 93972532105344, container: , device_id: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.0/sound/card3/controlC3, port: 28, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1, type: hardware, usb]

Port OUPUT ALSA (sequencer) added to map : [ client: 93972532105344, container: , device_id: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.0/sound/card3/controlC3, port: 28, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1, type: hardware, usb]

Port OUPUT PipeWire added to map : [ client: 0, port: 100, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 3:(playback_0) Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1]

Port INPUT PipeWire added to map : [ client: 0, port: 95, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 3:(capture_0) Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1]

Port INPUT ALSA (raw) added to map : [ client: 0, container: pci-0000:00:14.0-usb-0:9:1.0, device_id: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.0/sound/card3/controlC3, port: 3, manufacturer: Arturia KeyStep 37, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1, type: hardware, usb]

Port OUPUT ALSA (raw) added to map : [ client: 0, container: pci-0000:00:14.0-usb-0:9:1.0, device_id: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.0/sound/card3/controlC3, port: 3, manufacturer: Arturia KeyStep 37, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1, type: hardware, usb]

Keyboard Arturia Keystep 37 unplugged

Port INPUT ALSA (sequencer) removed not found in map : [ client: 93972532105344, port: 28, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1] 

Port OUPUT PipeWire removed from map : [ client: 0, port: 100, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 3:(playback_0) Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1]

Port INPUT PipeWire removed from map : [ client: 0, port: 95, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 3:(capture_0) Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1]

Port OUTPUT ALSA (sequencer) removed not found in map : [ client: 93972532105344, port: 28, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1] 

Port INPUT ALSA (raw) removed not found in map : [ client: 0, port: 3, manufacturer: Arturia KeyStep 37, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1] 

Port OUTPUT ALSA (raw) removed not found in map : [ client: 0, port: 3, manufacturer: Arturia KeyStep 37, device_name: Arturia KeyStep 37, port_name: Arturia KeyStep 37 MIDI 1, display_name: Arturia KeyStep 37 MIDI 1] 

Regards from Bordeaux ;)
OB

[jcelerier]

Thanks for the report! I don't have much time this week to look into it but will do my best to do ASAP. At a glance yeah, I added more information to port_information overtime so I guess this is causing problems in equality operators and sorting.
Most likely I have to define a sort key more precisely across all backends.