1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE TypeFamilies #-}
module Hsm.Stream
( Stream
, startStream
, stopStream
, runStream
)
where
import Control.Monad (void, when)
import Effectful (Dispatch (Static), DispatchOf, Eff, IOE, liftIO, (:>))
import Effectful.Dispatch.Static (SideEffects (WithSideEffects), StaticRep, evalStaticRep, getStaticRep, unsafeEff_)
import Effectful.Exception (finally)
import Foreign.C.String (withCString)
import Foreign.Ptr (Ptr, nullPtr)
import Hsm.Log (Log, Severity (Info), logMsg)
import Hsm.Stream.FFI
( GstElement
, gstDeinit
, gstElementSetState
, gstInit
, gstObjectUnref
, gstParseLaunch
, gstStateNull
, gstStatePlaying
)
import System.Environment (setEnv)
data Stream (a :: * -> *) (b :: *)
type instance DispatchOf Stream = Static WithSideEffects
newtype instance StaticRep Stream
= Stream (Ptr GstElement)
startStream :: (Log "stream" :> es, Stream :> es) => Eff es ()
startStream = do
Stream pipeline <- getStaticRep
logMsg Info "Starting stream"
unsafeEff_ . void $ gstElementSetState pipeline gstStatePlaying
stopStream :: (Log "stream" :> es, Stream :> es) => Eff es ()
stopStream = do
Stream pipeline <- getStaticRep
logMsg Info "Stopping stream"
unsafeEff_ . void $ gstElementSetState pipeline gstStateNull
runStream :: (IOE :> es, Log "stream" :> es) => Bool -> Eff (Stream : es) a -> Eff es a
runStream suppressXLogs action = do
when suppressXLogs $ do
logMsg Info "Suppressing external loggers"
liftIO $ setEnv "GST_DEBUG" "none"
liftIO $ setEnv "LIBCAMERA_LOG_LEVELS" "FATAL"
liftIO $ setEnv "WEBRTCSINK_SIGNALLING_SERVER_LOG" "none"
logMsg Info "Initializing gstreamer library"
liftIO $ gstInit nullPtr nullPtr
logMsg Info $ "Parsing gstreamer pipeline: " <> pipelineStr
pipeline <- liftIO . withCString pipelineStr $ \cStr -> gstParseLaunch cStr nullPtr
evalStaticRep (Stream pipeline) . finally action $ stopStream >> endStream
where
pipelineStr = "libcamerasrc ! videoconvert ! vp8enc deadline=1 ! webrtcsink run-signalling-server=true"
endStream = do
Stream pipeline <- getStaticRep
logMsg Info "Unrefing gstreamer pipeline"
liftIO $ gstObjectUnref pipeline
logMsg Info "De-initializing gstreamer library"
liftIO gstDeinit
|
