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pfent / Android-MISL-Control

An Android app used to control TAMUs ASEP Robot, controlled a MISL Stack
Apache License 2.0
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Video stream from phone to phone #9

Open b3nk4n opened 9 years ago

b3nk4n commented 9 years ago

Because it is hard to test with the IP-cam of ASEP, we will use a second android device as camera stream sender.

b3nk4n commented 9 years ago

VideoStreamSenderActivity was implemented, which can be accessed via Settings -> Video Streaming

It shows a preview of the device camera.

b3nk4n commented 9 years ago

A connection from a web-browser to the device could be established using that script:

<html>
    <head>
        <meta name='viewport' content='target-densitydpi=device-dpi,initial-scale=1,minimum-scale=1,user-scalable=yes'/>
    </head>
    <body>
        <center>
            <img src="http://192.168.178.53:6789/" alt="Stream" align="middle">
        </center>
    </body>
</html>

BUT: currently, we get a MediaRecorder can not start RuntimeException !?

b3nk4n commented 9 years ago

Interresting links: StreamProxy: http://stackoverflow.com/questions/5343730/mediaplayer-stutters-at-start-of-mp3-playback/

Sender/Receiver via MediaRecoder/MediaPlayer: http://stackoverflow.com/questions/6116880/stream-live-video-from-phone-to-phone-using-socket-fd/ Keep in mind that MediaPlayer can not play data from a socked directly. Therefore, we have to buffer the data in a file or use the StreamProxy.

b3nk4n commented 9 years ago

This user reports, that he gets the same error on his Samsung 4.0.4 device (like ours), but no error on another 4.2 device: http://stackoverflow.com/questions/16527009/mediarecorder-start-runtimeexception-start-failed-android-4-0-4

b3nk4n commented 9 years ago

Very useful source: http://developer.android.com/guide/topics/media/camera.html

b3nk4n commented 9 years ago

The camera API says: Note: Starting with Android 4.0 (API level 14), the Camera.lock() and Camera.unlock() calls are managed for you automatically.

But I can not confirm that, because it was not working on my 4.0.4 tablet without Camera.lock() or Camera.unlock() calls.

b3nk4n commented 9 years ago

Maybe we can get some inspiration from here: https://code.google.com/p/ipcamera-for-android/source/browse/trunk/droidipcam/src/teaonly/projects/droidipcam/CameraView.java

They are doing basically the same thing as we do. Maybe this could help us to know how to handle errors with the Camera lifecycle...

pfent commented 9 years ago

VideoViews seem to have an easy method of streaming: setVideoURI()

https://developer.android.com/reference/android/widget/VideoView.html