1. cat /proc/asound/pcm
00-03: NVIDIA HDMI : NVIDIA HDMI : playback 1
01-00: WM8903 HiFi WM8903-0 : : playback 1 : capture 1
01-01: Tegra BT Voice tegra_generic_BT_codec-1 : : playback 1 : capture 1
01-02: Tegra BB Voice tegra_generic_BB_codec-2 : : playback 1 : capture 1
01-03: Tegra Spdif tegra_generic_spdif_codec-3 : : playback 1 : capture 1
2. cat /proc/asound/devices
0: [ 0] : control
19: [ 0- 3]: digital audio playback
32: [ 1] : control
33: : timer
48: [ 1- 0]: digital audio playback
49: [ 1- 1]: digital audio playback
50: [ 1- 2]: digital audio playback
51: [ 1- 3]: digital audio playback
56: [ 1- 0]: digital audio capture
57: [ 1- 1]: digital audio capture
58: [ 1- 2]: digital audio capture
59: [ 1- 3]: digital audio capture
3. cat /proc/asound/cards
0 [tegrahda ]: HDA-Tegra - tegra-hda
tegra-hda at 0x70038000 irq 113
1 [tegrawm8903 ]: WM8903 - tegra-wm8903
tegra-wm8903 (WM8903)
4. cat proc/asound/card1/pcm3p/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 1024
buffer_size: 4096
4. cat proc/asound/card1/pcm3p/sub0/status
state: RUNNING
owner_pid : 129
trigger_time: 946685095.133345001
tstamp : 946685520.139324001
delay : 3576
avail : 520
avail_max : 1120
-----
hw_ptr : 18742800
appl_ptr : 18746376
