hardware-libaudio

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audio_hw: fallback to sampling rates 44100 if possible

improve the log

change the default sampling rates to 48000

The baytrail platform only supports 48000.
It won't affect others since all sound cards
I tested so far support 48000 as well.

audio_route: fix mediaserver crash

The segfault is because a null audio_route param is passed into
function reset_mixer_state.

Issue: 1209

Fix bad sleep time

The bad sleep time occurs when pcm_get_htimestamp() fails, leaving
kernel_frames uninitialized and causing out->cur_write_threshold to be
set to a very large value. The following patch ensures kernel_frames is
initialized to a sane value, it should fix most of the "limiting sleep
time" warnings and stuttering audio caused by sleeping too much.

add audio.usb.default

Suggested by Masaki Muranaka <monaka@monami-ya.jp>.

detect pcm card automatically

audio hal for jb-x86

Import from device/asus/grouper/audio of AOSP.

initial import