android音频调试技巧

常用命令 查看当前声卡信息

cat proc/asound/cards

bengal_515:/ # cat /proc/asound/cards 0 [bengalidpsndcar]: bengal-idp-snd- - bengal-idp-snd-card bengal-idp-snd-card 1 [Loopback ]: Loopback - Loopback Loopback 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