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# Audio thread log viewer
It is a tool to draw a time chart from audio thread log. It can make debug
easier.
[TOC]
## Prepare an audio thread log
The easiest way to get audio thread log is typing `cras_test_client --dump_a`
in ChromeOS shell.
The format should be like
```
Audio Thread Event Log:
start at 4434i
2019-07-02T15:30:46.539479158 cras atlog SET_DEV_WAKE dev:7 hw_level:216 sleep:168
2019-07-02T15:30:46.539482658 cras atlog DEV_SLEEP_TIME dev:7 wake: 15:30:46.542974324
2019-07-02T15:30:46.539492991 cras atlog DEV_SLEEP_TIME dev:8 wake: 15:30:46.539358095
2019-07-02T15:30:46.539501241 cras atlog SLEEP sleep:000000000.000000000 longest_wake:001553999
...
```
## Generate an HTML file
```
usage: viewer_c3.py [-h] [-o OUTPUT] [-d] FILE
Draw time chart from audio thread log
positional arguments:
FILE The audio thread log file
optional arguments:
-h, --help show this help message and exit
-o OUTPUT The output HTML file (default: view.html)
-d Show debug message (default: False)
```
## View the result
Open the output from vierwe_c3.py by Chrome. There are several functions in
this site:
+ The blue points show the hardware level change of the audio thread logs.
Click a point can jump to a corresponding line in the log area.
+ There are some options can be selected. It can show the event in the chart
so that users can easily see when a stream is added, when a stream is fetched
, and so on.
+ The textarea in the lower right corner can be used to note.
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