On Fri, Sep 06, 2019 at 09:55:44PM +0900, Takashi Sakamoto wrote: > Userspace applications can receive the transaction and parse it for > control message via Linux FireWire subsystem, without any support by > ALSA firewire-tascam driver. Therefore the driver gives no support > for it. For your information, this is a sample Python 3 script to listen the transactions, utilizing PyGObject to load Hinawa-2.0 g-i. ``` #!/usr/bin/env python3 import gi gi.require_version('Hinawa', '2.0') from gi.repository import Hinawa gi.require_version('GLib', '2.0') from gi.repository import GLib from signal import SIGINT from struct import unpack, pack from time import sleep # Allocate address space to receive notification. class Fe8Responder(Hinawa.FwResp): def __init__(self, unit): super().__init__() # Allocate within private space. addr = 0xffffe0000000 while addr < 0xfffff0000000: try: self.register(unit, addr, 0x80) break except: addr += 0x80 self.addr = addr def do_requested(self, tcode): frames = self.get_req_frame() # Just print the event. Practically translate it to general MIDI # messages and send the messages to the other processes via IPC such as # ALSA Sequencer. for i in range(0, len(frames), 4): print('{:08x}'.format(unpack('>I', frames[i:i+4])[0])) return Hinawa.FwRcode.COMPLETE # For a case that the device is detected as '/dev/fw1'. unit = Hinawa.FwUnit() unit.open('/dev/fw1') unit.listen() resp = Fe8Responder(unit) req = Hinawa.FwReq() # Register the address. addr_hi = pack('>H', unit.get_property('local-node-id')) addr_hi += pack('>H', (resp.addr & 0xffff00000000) >> 32) addr_lo = pack('>I', resp.addr & 0xffffffff) req.write(unit, 0xffff00000314, addr_hi) req.write(unit, 0xffff00000318, addr_lo) # Enable notification. req.write(unit, 0xffff00000310, pack('>I', 1)) # Turn on FireWire LED. data = [0x00, 0x01, 0x00, 0x8e] req.write(unit, 0xffff00000404, data) # Wait for events. def handle_unix_signal(loop): loop.quit() loop = GLib.MainLoop() GLib.unix_signal_add(GLib.PRIORITY_HIGH, SIGINT, handle_unix_signal, loop) loop.run() # Disable notification. req.write(unit, 0xffff00000310, pack('>I', 0)) # Turn off FireWire LED. data = [0x00, 0x00, 0x00, 0x8e] req.write(unit, 0xffff00000404, data) del req del resp del unit ``` Regards Takashi Sakamoto _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel