1 とりあえず今使えるデバイスを見る

1. dmesgでpcm*を調べる

   • 出力(スピーカー)は"Play"，入力(マイク)は"Record"
   • ボリューム調整の有無は
     • "HID volume keys found"⇒mixerでボリュームコントロールできる
     • "No HID volume keys found"⇒mixerでボリュームコントロールできない

   【例】

   # dmesg | tail -47
   ugen0.5: <GenesysLogic USB2.1 Hub> at usbus0
   uhub3 numa-domain 0 on uhub2
   uhub3: <GenesysLogic USB2.1 Hub, class 9/0, rev 2.10/6.54, addr \
       26> on usbus0
   uhub3: 4 ports with 4 removable, self powered
   ugen0.6: <PFU Limited HHKB-Hybrid> at usbus0
   ukbd1 numa-domain 0 on uhub3
   ukbd1: <keyboard> on usbus0
   kbd3 at ukbd1
   ukbd2 numa-domain 0 on uhub3
   ukbd2: <Multi-Media> on usbus0
   kbd4 at ukbd2
   uhid0 numa-domain 0 on uhub3
   uhid0: <PFU Limited HHKB-Hybrid, class 0/0, rev 1.10/0.01, addr \
       46> on usbus0
   ugen0.7: <Logitech Wireless Receiver> at usbus0
   ums1 numa-domain 0 on uhub3
   ums1: <Logitech Wireless Receiver, class 0/0, rev 1.10/3.02, addr \
       35> on usbus0
   ums1: 5 buttons and [XYZ] coordinates ID=1
   ugen0.8: <Sonix Technology Co., Ltd. USB  Live camera> at usbus0
   uaudio0 numa-domain 0 on uhub3
   uaudio0: <USB Live Camera audio> on usbus0
   uaudio0: No playback.
   uaudio0: Record[0]: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms \
       buffer.
   uaudio0: Record[0]: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms \
       buffer.
   uaudio0: Record[0]: 11025 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms \
       buffer.
   uaudio0: No MIDI sequencer.
   pcm3: <USB audio> numa-domain 0 on uaudio0 ← Sonix の USB Live \
       camera 付属のマイク
   uaudio0: No HID volume keys found.  ← pcm3 はボリュームコントロールできない
   ugen0.9: <GenesysLogic USB2.1 Hub> at usbus0
   uhub4 numa-domain 0 on uhub3
   uhub4: <GenesysLogic USB2.1 Hub, class 9/0, rev 2.10/6.54, addr \
       34> on usbus0
   uhub4: 4 ports with 4 removable, self powered
   ugen0.10: <Solid State System Co.,Ltd. TKGOU PnP USB Microphone> \
       at usbus0
   uaudio1 numa-domain 0 on uhub4
   uaudio1: <Solid State System Co.,Ltd. TKGOU PnP USB Microphone, \
       class 0/0, rev 1.10/1.00, addr 32> on usbus0
   uaudio1: No playback.
   uaudio1: Record[0]: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms \
       buffer.
   uaudio1: No MIDI sequencer.
   pcm4: <USB audio> numa-domain 0 on uaudio1  ← TKGOU のマイク
   uaudio1: HID volume keys found.  ← pcm4 はボリュームコントロールできる
   ugen0.11: <Harman Multimedia JBL Pebbles> at usbus0
   uaudio2 numa-domain 0 on uhub4
   uaudio2: <Harman Multimedia JBL Pebbles, class 0/0, rev \
       1.10/1.00, addr 11> on usbus0
   uaudio2: Play[0]: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms \
       buffer.
   uaudio2: No recording.
   uaudio2: No MIDI sequencer.
   pcm5: <USB audio> numa-domain 0 on uaudio2  ← JBL Pebbles のスピーカー
   uaudio2: HID volume keys found.  ← pcm5 はボリュームコントロールできる
   # 
   

2. 実際に確認されたものは/dev/sndstatに書き込まれる

   • 単に表示するだけ

     【例】

     # cat /dev/sndstat
     Installed devices:
     pcm0: <NVIDIA (0x0094) (HDMI/DP 8ch)> (play) default
     pcm1: <NVIDIA (0x0094) (HDMI/DP 8ch)> (play)
     pcm2: <NVIDIA (0x0094) (HDMI/DP 8ch)> (play)
     pcm3: <USB audio> (rec)
     pcm4: <USB audio> (rec)
     pcm5: <USB audio> (play)
     No devices installed from userspace.
     # 
     

   • もっと詳しく見たい場合は`sysctl hw.snd.verbose=2'する

     【例】

     # sysctl hw.snd.verbose=2
     hw.snd.verbose: 0 -> 2
     # cat /dev/sndstat
     FreeBSD Audio Driver (64bit 2009061500/amd64)
     Installed devices:
     pcm0: <NVIDIA (0x0094) (HDMI/DP 8ch)> on hdaa0 (1p:1v/0r:0v) \
         default
     snddev \
         flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC> \
     [pcm0:play:dsp0.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, \
         0x00000004
     interrupts 88, underruns 0, feed 88, ready 0 \
         [b:2048/1024/2|bs:2048/1024/2]
             channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
             {userland} -> feeder_mixer(0x00200010) -> {hardware}
     pcm0:play:dsp0.p0[pcm0:virtual:dsp0.vp0]: spd 44100/48000, fmt \
         0x00200010, flags 0x10000000, 0x00000029
     interrupts 0, underruns 0, feed 0, ready 0 \
         [b:0/0/0|bs:8192/1024/8]
             channel flags=0x10000000<VIRTUAL>
     {userland} -> feeder_root(0x00200010) -> \
         feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 \
         -> 48000) -> {hardware}
     pcm1: <NVIDIA (0x0094) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
     snddev \
         flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC> \
     [pcm1:play:dsp1.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, \
         0x00000004
     interrupts 66, underruns 0, feed 66, ready 0 \
         [b:2048/1024/2|bs:2048/1024/2]
             channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
             {userland} -> feeder_mixer(0x00200010) -> {hardware}
     pcm1:play:dsp1.p0[pcm1:virtual:dsp1.vp0]: spd 44100/48000, fmt \
         0x00200010, flags 0x10000000, 0x00000029
     interrupts 0, underruns 0, feed 0, ready 0 \
         [b:0/0/0|bs:8192/1024/8]
             channel flags=0x10000000<VIRTUAL>
     {userland} -> feeder_root(0x00200010) -> \
         feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 \
         -> 48000) -> {hardware}
     pcm2: <NVIDIA (0x0094) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
     snddev \
         flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC> \
     [pcm2:play:dsp2.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, \
         0x00000004
     interrupts 44, underruns 0, feed 44, ready 0 \
         [b:2048/1024/2|bs:2048/1024/2]
             channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
             {userland} -> feeder_mixer(0x00200010) -> {hardware}
     pcm2:play:dsp2.p0[pcm2:virtual:dsp2.vp0]: spd 44100/48000, fmt \
         0x00200010, flags 0x10000000, 0x00000029
     interrupts 0, underruns 0, feed 0, ready 0 \
         [b:0/0/0|bs:8192/1024/8]
             channel flags=0x10000000<VIRTUAL>
     {userland} -> feeder_root(0x00200010) -> \
         feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 \
         -> 48000) -> {hardware}
     pcm3: <USB audio> at ? kld snd_uaudio (0p:0v/1r:1v)
     snddev flags=0x2e3<SIMPLEX,AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
     [pcm3:record:dsp3.r0]: spd 48000, fmt 0x00200010, flags \
         0x00002100, 0x00000005
     interrupts 0, overruns 0, feed 0, hfree 3072, sfree 4096 \
         [b:3072/1536/2|bs:4096/2048/2]
             channel flags=0x2100<BUSY,HAS_VCHAN>
     {hardware} -> feeder_root(0x00200010) -> feeder_mixer(0x00200010) \
         -> {userland}
     pcm3:record:dsp3.r0[pcm3:virtual:dsp3.vr0]: spd 8000, fmt \
         0x00100008, flags 0x10000000, 0x00000000
     interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 \
         [b:0/0/0|bs:0/0/0]
             channel flags=0x10000000<VIRTUAL>
             {hardware} -> feeder_root(0x00000000) -> {userland}
     pcm4: <USB audio> at ? kld snd_uaudio (0p:0v/1r:1v)
     snddev flags=0x2e3<SIMPLEX,AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
     [pcm4:record:dsp4.r0]: spd 48000, fmt 0x00200010/0x00100010, \
         flags 0x00002100, 0x00000045
     interrupts 0, overruns 0, feed 0, hfree 1536, sfree 4096 \
         [b:1536/768/2|bs:4096/2048/2]
             channel flags=0x2100<BUSY,HAS_VCHAN>
     {hardware} -> feeder_root(0x00100010) -> feeder_matrix(1.0 -> \
         2.0) -> feeder_mixer(0x00200010) -> {userland}
     pcm4:record:dsp4.r0[pcm4:virtual:dsp4.vr0]: spd 8000, fmt \
         0x00100008, flags 0x10000000, 0x00000000
     interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 \
         [b:0/0/0|bs:0/0/0]
             channel flags=0x10000000<VIRTUAL>
             {hardware} -> feeder_root(0x00000000) -> {userland}
     pcm5: <USB audio> at ? kld snd_uaudio (1p:1v/0r:0v)
     snddev flags=0x2e3<SIMPLEX,AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
     [pcm5:play:dsp5.p0]: spd 48000, fmt 0x00200010, flags 0x00002100, \
         0x00000004
     interrupts 0, underruns 0, feed 0, ready 0 \
         [b:3072/1536/2|bs:4096/2048/2]
             channel flags=0x2100<BUSY,HAS_VCHAN>
             {userland} -> feeder_mixer(0x00200010) -> {hardware}
     pcm5:play:dsp5.p0[pcm5:virtual:dsp5.vp0]: spd 8000, fmt \
         0x00100008, flags 0x10000000, 0x00000000
     interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
             channel flags=0x10000000<VIRTUAL>
             {userland} -> feeder_root(0x00000000) -> {hardware}
     No devices installed from userspace.
     #