常用命令
查看当前声卡信息
cat proc/asound/cards
bengal_515:/ # cat /proc/asound/cards0 [bengalidpsndcar]: bengal-idp-snd- - bengal-idp-snd-cardbengal-idp-snd-card1 [Loopback ]: Loopback - LoopbackLoopback 1
查看PCM设备列表
cat proc/asound/pcm
bengal_515:/ # cat /proc/asound/pcm
00-00: PCM_RT_PROXY-TX-1 snd-soc-dummy-dai-0 : : capture 1
00-01: PCM_RT_PROXY-RX-1 snd-soc-dummy-dai-1 : : playback 1
00-02: USB_AUDIO-RX snd-soc-dummy-dai-2 : : playback 1
00-03: USB_AUDIO-TX snd-soc-dummy-dai-3 : : capture 1
00-04: PCM_DUMMY-TX-0 snd-soc-dummy-dai-4 : : capture 1
00-05: CODEC_DMA-LPAIF_RXTX-RX-0 multicodec-5 : : playback 1
00-06: CODEC_DMA-LPAIF_RXTX-RX-1 multicodec-6 : : playback 1
00-07: CODEC_DMA-LPAIF_RXTX-RX-2 multicodec-7 : : playback 1
00-08: CODEC_DMA-LPAIF_RXTX-RX-3 multicodec-8 : : playback 1
00-09: CODEC_DMA-LPAIF_RXTX-TX-3 multicodec-9 : : capture 1
00-10: CODEC_DMA-LPAIF_RXTX-TX-4 multicodec-10 : : capture 1
00-11: CODEC_DMA-LPAIF_VA-TX-0 va_macro_tx1-11 : : capture 1
00-12: CODEC_DMA-LPAIF_VA-TX-1 va_macro_tx2-12 : : capture 1
00-13: CODEC_DMA-LPAIF_VA-TX-2 va_macro_tx3-13 : : capture 1
00-14: MI2S-LPAIF-RX-PRIMARY msm-stub-rx-14 : : playback 1
00-15: MI2S-LPAIF-TX-PRIMARY msm-stub-tx-15 : : capture 1
00-16: MI2S-LPAIF-RX-SECONDARY msm-stub-rx-16 : : playback 1
00-17: MI2S-LPAIF-TX-SECONDARY msm-stub-tx-17 : : capture 1
00-18: MI2S-LPAIF_AUD-RX-SECONDARY msm-stub-rx-18 : : playback 1
00-19: MI2S-LPAIF_AUD-TX-SECONDARY msm-stub-tx-19 : : capture 1
00-20: MI2S-LPAIF_RXTX-RX-PRIMARY msm-stub-rx-20 : : playback 1
00-21: MI2S-LPAIF_RXTX-TX-PRIMARY msm-stub-tx-21 : : capture 1
00-22: SLIM-DEV1-RX-7 btfm_bt_sco_a2dp_slim_rx-22 : : playback 1
00-23: SLIM-DEV1-TX-7 btfm_bt_sco_slim_tx-23 : : capture 1
00-24: SLIM-DEV1-TX-8 btfm_fm_slim_tx-24 : : capture 1
01-00: Loopback PCM : Loopback PCM : playback 8 : capture 8
01-01: Loopback PCM : Loopback PCM : playback 8 : capture 8
查看PCM占用情况
lsof | grep pcm
bengal_515:/ # lsof | grep pcm
gyt_play 1098 audioserve 5u CHR 116,2 0t0 937 /dev/snd/pcmC1D0p
binder:29877_2 29877 audioserve mem REG 0,32 28304 2655 /vendor/lib64/libagm_pcm_plugin.so
binder:29877_2 29877 audioserve 43u CHR 116,12 0t0 1051 /dev/snd/pcmC0D5p
binder:29877_2 29877 audioserve 45u CHR 116,21 0t0 1060 /dev/snd/pcmC0D14p
bengal_515:/ #
查看音频节点
bengal_515:/ # ls -l dev/snd
total 0
crw-rw---- 1 system audio 116, 34 1970-01-01 08:11 controlC0
crw-rw---- 1 system audio 116, 6 1970-01-01 08:11 controlC1
crw-rw---- 1 system audio 116, 7 1970-01-01 08:11 pcmC0D0c
crw-rw---- 1 system audio 116, 17 1970-01-01 08:11 pcmC0D10c
crw-rw---- 1 system audio 116, 18 1970-01-01 08:11 pcmC0D11c
crw-rw---- 1 system audio 116, 19 1970-01-01 08:11 pcmC0D12c
crw-rw---- 1 system audio 116, 20 1970-01-01 08:11 pcmC0D13c
crw-rw---- 1 system audio 116, 21 1970-01-01 08:11 pcmC0D14p
crw-rw---- 1 system audio 116, 22 1970-01-01 08:11 pcmC0D15c
crw-rw---- 1 system audio 116, 23 1970-01-01 08:11 pcmC0D16p
crw-rw---- 1 system audio 116, 24 1970-01-01 08:11 pcmC0D17c
crw-rw---- 1 system audio 116, 25 1970-01-01 08:11 pcmC0D18p
crw-rw---- 1 system audio 116, 26 1970-01-01 08:11 pcmC0D19c
crw-rw---- 1 system audio 116, 8 1970-01-01 08:11 pcmC0D1p
crw-rw---- 1 system audio 116, 27 1970-01-01 08:11 pcmC0D20p
crw-rw---- 1 system audio 116, 28 1970-01-01 08:11 pcmC0D21c
crw-rw---- 1 system audio 116, 29 1970-01-01 08:11 pcmC0D22p
crw-rw---- 1 system audio 116, 30 1970-01-01 08:11 pcmC0D23c
crw-rw---- 1 system audio 116, 31 1970-01-01 08:11 pcmC0D24c
crw-rw---- 1 system audio 116, 9 1970-01-01 08:11 pcmC0D2p
crw-rw---- 1 system audio 116, 10 1970-01-01 08:11 pcmC0D3c
crw-rw---- 1 system audio 116, 11 1970-01-01 08:11 pcmC0D4c
crw-rw---- 1 system audio 116, 12 1970-01-01 08:11 pcmC0D5p
crw-rw---- 1 system audio 116, 13 1970-01-01 08:11 pcmC0D6p
crw-rw---- 1 system audio 116, 14 1970-01-01 08:11 pcmC0D7p
crw-rw---- 1 system audio 116, 15 1970-01-01 08:11 pcmC0D8p
crw-rw---- 1 system audio 116, 16 1970-01-01 08:11 pcmC0D9c
crw-rw---- 1 system audio 116, 3 1970-01-01 08:11 pcmC1D0c
crw-rw---- 1 system audio 116, 2 1970-01-01 08:11 pcmC1D0p
crw-rw---- 1 system audio 116, 5 1970-01-01 08:11 pcmC1D1c
crw-rw---- 1 system audio 116, 4 1970-01-01 08:11 pcmC1D1p
crw-rw---- 1 system audio 116, 33 1970-01-01 08:00 timer
