sysctl hw.snd.verbose=2 ; cat /dev/sndstat
hw.snd.verbose: 1 -> 2
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <Intel 82801G High Definition Audio Controller> at memory 0xee240000 irq 17 kld snd_hda (1p/1r/4v channels duplex default)
[pcm0:play:0:dsp0.0]: spd 48000, fmt 0x10000010, flags 0x00101020, 0x00000000
interrupts 59023, underruns 0, ready 0 [b:16384/8192/2|bs:131072/4096/32]
{userland} -> feeder_vchan_s16(0x10000010) -> {hardware}
[pcm0:record:0:dsp0.1]: spd 0, fmt 0x00000000/0x00000008, flags 0x00000000, 0x00000000
interrupts 0, overruns 0, hfree 16384, sfree 0 [b:16384/8192/2|bs:0/0/0]
{hardware} -> feeder_root(0x00000000) -> {userland}
pcm0:play:0:dsp0.0[pcm0:virtual:0:dsp0.2]: spd 44100/48000, fmt 0x10000010, flags 0x10003030, 0x00000010, pid 944
interrupts 0, underruns 0, ready 0 [b:0/4096/0|bs:65536/256/256]
{userland} -> feeder_root(0x10000010) -> feeder_rate(44100 -> 48000) -> {hardware}
pcm0:play:0:dsp0.0[pcm0:virtual:1:dsp0.3]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
{userland} -> feeder_root(0x00000000) -> {hardware}
pcm0:play:0:dsp0.0[pcm0:virtual:2:dsp0.4]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
{userland} -> feeder_root(0x00000000) -> {hardware}
pcm0:play:0:dsp0.0[pcm0:virtual:3:dsp0.5]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
{userland} -> feeder_root(0x00000000) -> {hardware}