Audio events (#6848)

* Initial audio classification model implementation

* fix mypy

* Keep audio labelmap local

* Cleanup

* Start adding config for audio

* Add the detector

* Add audio detection process keypoints

* Build out base config

* Load labelmap correctly

* Fix config bugs

* Start audio process

* Fix startup issues

* Try to cleanup restarting

* Add ffmpeg input args

* Get audio detection working

* Save event to db

* End events if not heard for 30 seconds

* Use not heard config

* Stop ffmpeg when shutting down

* Fixes

* End events correctly

* Use api instead of event queue to save audio events

* Get events working

* Close threads when stop event is sent

* remove unused

* Only start audio process if at least one camera is enabled

* Add const for float

* Cleanup labelmap

* Add audio icon in frontend

* Add ability to toggle audio with mqtt

* Set initial audio value

* Fix audio enabling

* Close logpipe

* Isort

* Formatting

* Fix web tests

* Fix web tests

* Handle cases where args are a string

* Remove log

* Cleanup process close

* Use correct field

* Simplify if statement

* Use var for localhost

* Add audio detectors docs

* Add restream docs to mention audio detection

* Add full config docs

* Fix links to other docs

---------

Co-authored-by: Jason Hunter <hunterjm@gmail.com>

frigate/const.py

@@ -8,6 +8,7 @@ EXPORT_DIR = f"{BASE_DIR}/exports"
 BIRDSEYE_PIPE = "/tmp/cache/birdseye"
 CACHE_DIR = "/tmp/cache"
 YAML_EXT = (".yaml", ".yml")
+FRIGATE_LOCALHOST = "http://127.0.0.1:5000"
 PLUS_ENV_VAR = "PLUS_API_KEY"
 PLUS_API_HOST = "https://api.frigate.video"
 BTBN_PATH = "/usr/lib/btbn-ffmpeg"
@@ -22,6 +23,13 @@ ALL_ATTRIBUTE_LABELS = [
     item for sublist in ATTRIBUTE_LABEL_MAP.values() for item in sublist
 ]
 
+# Audio Consts
+
+AUDIO_DURATION = 0.975
+AUDIO_FORMAT = "s16le"
+AUDIO_MAX_BIT_RANGE = 32768.0
+AUDIO_SAMPLE_RATE = 16000
+
 # Regex Consts
 
 REGEX_CAMERA_NAME = r"^[a-zA-Z0-9_-]+$"