Add audio/video enable properties

[pnbruckner]

Add properties for determining if any audio/video streams are enabled, and corresponding setters to enable/disable audio/video. Bump version to 1.3.0.

[coveralls]

Coverage increased (+0.1%) to 33.478% when pulling da4f3d3 on streaming-on-off into 2872882 on master.

[pnbruckner]

I'd like for you to test this on whatever cameras you have. I know it works on my cameras (IP2M-841W/2.520.AC00.18.R/2017-06-29 & IP3M-943W/2.400.AC02.15.R/2017-07-31).

To test:

from amcrest import AmcrestCamera
cam = AmcrestCamera(...).camera
cam.audio_enabled
cam.audio_enabled = False
cam.audio_enabled # should return False
cam.audio_enabled = True
cam.audio_enabled # should return True

Same for video, but cam.video_enabled instead.

Oh, BTW, if a camera does not support an audio output stream (i.e., no microphone, like my IP3M-943W), there will be no errors or exceptions, the audio_enabled property will simply always return False.

Also, of course, let me know if I should change anything in the way I implemented it.

Assuming this looks ok I have some other commands I want to add, but I'll probably just commit them directly to master. I figured I'd use a PR here to give you a chance to decide if you like the direction I'm going. :)

[pnbruckner]

@tchellomello @dougsland

Hi guys. Have you had a chance to look this over? And test it? Thoughts?

The biggest question I have, besides whether or not, in general, this works on other camera models & firmware versions than I have, is if these lines are appropriate:

https://github.com/tchellomello/python-amcrest/blob/streaming-on-off/src/amcrest/video.py#L148-L155

They set the "SmartIR" mode so that the IR LEDs come on when necessary (when video is enabled), or are turned completely off (when the video stream is disabled.) Do all cameras support this feature? Or would it need to be conditional based on camera model and/or software version? Or, since the response isn't checked, does it not hurt to send it even if the camera doesn't support it?

[pnbruckner]

@tchellomello @dougsland

I'm assuming you guys are too busy to provide feedback, so I'll go ahead with this.

[tchellomello]

@pnbruckner It was a busy week!! It's an awesome addition 🥇

You rock!