async def async_get_still_stream(
request: web.Request,
image_cb: Callable[[], Awaitable[bytes | None]],
content_type: str,
interval: float,
) -> web.StreamResponse:
"""Generate an HTTP MJPEG stream from camera images.
This method must be run in the event loop.
"""
response = web.StreamResponse()
response.content_type = CONTENT_TYPE_MULTIPART.format("--frameboundary")
await response.prepare(request)
async def write_to_mjpeg_stream(img_bytes: bytes) -> None:
"""Write image to stream."""
await response.write(
bytes(
"--frameboundary\r\n"
"Content-Type: {}\r\n"
"Content-Length: {}\r\n\r\n".format(content_type, len(img_bytes)),
"utf-8",
)
+ img_bytes
+ b"\r\n"
)
last_image = None
while True:
img_bytes = await image_cb()
if not img_bytes:
break
if img_bytes != last_image:
await write_to_mjpeg_stream(img_bytes)
# Chrome seems to always ignore first picture,
# print it twice.
if last_image is None:
await write_to_mjpeg_stream(img_bytes)
last_image = img_bytes
await asyncio.sleep(interval)
return response
async def async_get_still_stream(request, image_cb, content_type, interval):
"""Generate an HTTP MJPEG stream from camera images.
The original implementation in the HA core camera
component, had some issues in displaying the images
The view was always 1 frame behind
so thats why it was in the original code to send twice at start.
Normally not a problem, but in this component it is essential that the
image that is served is also displayed
"""
response = web.StreamResponse()
response.content_type = CONTENT_TYPE_MULTIPART.format("--frameboundary")
await response.prepare(request)
async def write_to_mjpeg_stream(img_bytes):
"""Write image to stream."""
await response.write(
bytes(
"--frameboundary\r\n"
"Content-Type: {}\r\n"
"Content-Length: {}\r\n\r\n".format(content_type, len(
img_bytes)),
"utf-8",
) + img_bytes + b"\r\n")
LastImage = None
SameImagecount = 0
while True:
img_bytes = await image_cb()
if not img_bytes:
break
# Send same image max 2 times, to fix browserproblem
if img_bytes == LastImage:
SameImagecount += 1
else:
SameImagecount = 0
if SameImagecount < 2:
await write_to_mjpeg_stream(img_bytes)
LastImage = img_bytes
await asyncio.sleep(interval)
return response
def ffmpeg_stream_content_type(self):
"""Return HTTP content type for ffmpeg stream."""
if self._major_version is not None and self._major_version > 3:
return CONTENT_TYPE_MULTIPART.format("ffmpeg")
return CONTENT_TYPE_MULTIPART.format("ffserver")
