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Ensure birdseye restream is not left with partially read frames (#5504)

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* Ensure birdseye pipe does not get corrupted

* Fix conditionals

* Change log

* Formatting
This commit is contained in:
Nicolas Mowen 2023-02-16 06:49:31 -07:00 committed by GitHub
parent c9cd810c9f
commit 7b26935462
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 26 additions and 10 deletions
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36
frigate/output.py
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@ -38,16 +38,10 @@ class FFMpegConverter:
quality: int,
birdseye_rtsp: bool = False,
):
if birdseye_rtsp:
if os.path.exists(BIRDSEYE_PIPE):
os.remove(BIRDSEYE_PIPE)
self.bd_pipe = None
os.mkfifo(BIRDSEYE_PIPE, mode=0o777)
stdin = os.open(BIRDSEYE_PIPE, os.O_RDONLY | os.O_NONBLOCK)
self.bd_pipe = os.open(BIRDSEYE_PIPE, os.O_WRONLY)
os.close(stdin)
else:
self.bd_pipe = None
if birdseye_rtsp:
self.recreate_birdseye_pipe()
ffmpeg_cmd = [
"ffmpeg",
@ -80,14 +74,36 @@ class FFMpegConverter:
start_new_session=True,
)
def recreate_birdseye_pipe(self) -> None:
if self.bd_pipe:
os.close(self.bd_pipe)
if os.path.exists(BIRDSEYE_PIPE):
os.remove(BIRDSEYE_PIPE)
os.mkfifo(BIRDSEYE_PIPE, mode=0o777)
stdin = os.open(BIRDSEYE_PIPE, os.O_RDONLY | os.O_NONBLOCK)
self.bd_pipe = os.open(BIRDSEYE_PIPE, os.O_WRONLY)
os.close(stdin)
self.reading_birdseye = False
def write(self, b) -> None:
self.process.stdin.write(b)
if self.bd_pipe:
try:
os.write(self.bd_pipe, b)
self.reading_birdseye = True
except BrokenPipeError:
# catch error when no one is listening
if self.reading_birdseye:
# we know the pipe was being read from and now it is not
# so we should recreate the pipe to ensure no partially-read
# frames exist
logger.debug(
"Recreating the birdseye pipe because it was read from and now is not"
)
self.recreate_birdseye_pipe()
return
def read(self, length):