PCM Cards - Google Nexus 5

/* There is only one card on the Device card0 == msm8974taikomtp */
root@hammerhead:/proc/asound # ls -l
dr-xr-xr-x root     root              2014-08-01 13:34 card0
lrwxrwxrwx root     root              2014-08-01 13:34 msm8974taikomtp -> card0

root@hammerhead:/ # cat /proc/asound/cards
 0 [msm8974taikomtp]: msm8974-taiko-m - msm8974-taiko-mtp-snd-card
                      msm8974-taiko-mtp-snd-card

/* Different Types of Card:Device */
root@hammerhead:/ # cat /proc/asound/pcm
00-00: MultiMedia1 (*) :  : playback 1 : capture 1
00-01: MultiMedia2 (*) :  : playback 1 : capture 1
00-02: CS-Voice (*) :  : playback 1 : capture 1
00-03: VoIP (*) :  : playback 1 : capture 1
00-04: LPA (*) :  : playback 1
00-05: SLIMBUS_0 Hostless (*) :  : playback 1 : capture 1
00-06: INT_FM Hostless (*) :  : playback 1 : capture 1
00-07: AFE-PROXY RX msm-stub-rx-7 :  : playback 1
00-08: AFE-PROXY TX msm-stub-tx-8 :  : capture 1
00-09: (COMPR) :  : playback 1
00-10: AUXPCM Hostless (*) :  : playback 1 : capture 1
00-11: SLIMBUS_1 Hostless (*) :  : playback 1 : capture 1
00-12: SLIMBUS_3 Hostless (*) :  : playback 1 : capture 1
00-13: SLIMBUS_4 Hostless (*) :  : playback 1 : capture 1
00-14: VoLTE (*) :  : playback 1 : capture 1
00-15: MultiMedia5 (*) :  : playback 1 : capture 1
00-16: Listen Audio Service (*) :  : capture 1
00-17: COMPR2 (*) :  : playback 1 : capture 1
00-18: COMPR3 (*) :  : playback 1
00-19: COMPR4 (*) :  : playback 1
00-20: HDMI_RX_HOSTLESS (*) :  : playback 1
00-21: INT_HFP_BT Hostless (*) :  : playback 1 : capture 1
00-22: MultiMedia6 (*) :  : playback 1 : capture 1
00-23: Slimbus4 Capture taiko_vifeedback-23 :  : capture 1
00-24: SLIMBUS_2 Hostless Playback taiko_rx2-24 :  : playback 1
00-25: SLIMBUS_2 Hostless Capture taiko_tx2-25 :  : capture 1
00-26: (Internal BT-SCO Playback) :  : playback 1
00-27: (Internal BT-SCO Capture) :  : capture 1
00-28: (Internal FM Playback) :  : playback 1
00-29: (Internal FM Capture) :  : capture 1
00-30: (AFE Playback) :  : playback 1
00-31: (AFE Capture) :  : capture 1
00-32: (AUX PCM Playback) :  : playback 1 : capture 1
00-33: (AUX PCM Capture) :  : playback 1 : capture 1
00-34: (Sec AUX PCM Playback) :  : playback 1 : capture 1
00-35: (Sec AUX PCM Capture) :  : playback 1 : capture 1
00-36: (Slimbus Playback) :  : playback 1
00-37: (Slimbus Capture) :  : capture 1
00-38: (Slimbus1 Playback) :  : playback 1
00-39: (Slimbus1 Capture) :  : capture 1
00-40: (Slimbus3 Playback) :  : playback 1
00-41: (Slimbus3 Capture) :  : capture 1
00-42: (Slimbus4 Playback) :  : playback 1
00-43: (Voice Uplink Capture) :  : capture 1
00-44: (Voice Downlink Capture) :  : capture 1
00-45: (Slimbus5 Capture) :  : capture 1
00-46: (Voice Farend Playback) :  : playback 1
00-47: (HDMI Playback) :  : playback 1


/* Logcat Output - When a Song is played*/
V/audio_hw_primary(  216): start_output_stream: enter: usecase(1: low-latency-playback) devices(0x2)
D/audio_hw_primary(  216): select_devices: out_snd_device(2: speaker) in_snd_device(0: )
V/audio_hw_primary(  216): enable_snd_device: snd_device(2: speaker) is already active
V/audio_hw_primary(  216): enable_audio_route: enter: usecase(1)
V/audio_hw_primary(  216): enable_audio_route: apply mixer path: low-latency-playback
V/audio_hw_primary(  216): enable_audio_route: exit
V/audio_hw_primary(  216): start_output_stream: Opening PCM device card_id(0) device_id(15)     /* hw:0:15 */
V/audio_hw_primary(  216): start_output_stream: exit
V/audio_hw_primary(  216): out_resume

/* Simultaneously looking at changes in pcm15p */

root@hammerhead:/proc/asound # cat /proc/asound/card0/pcm15p/sub0/status
state: RUNNING
owner_pid   : 915
trigger_time: 5433.323668648
tstamp      : 5436.358784898
delay       : 480
avail       : 0
avail_max   : 240
-----
hw_ptr      : 145920
appl_ptr    : 146400

root@hammerhead:/proc/asound # cat /proc/asound/card0/pcm15p/sub0/status
closed

/* It is not showing state:RUNNING continuously */