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Re: [Linphone-developers] Need Help : Unable to Open Camera in Linphone

From: saurav maitra
Subject: Re: [Linphone-developers] Need Help : Unable to Open Camera in Linphone Using MediaStreamer
Date: Thu, 25 Oct 2012 09:44:04 +0530

Thanks for the reply,

I do not have the link to the native API documentation, though I have heard from different sources that, Tizen (ARM platform) uses Gstreamer (instead of MediaStreamer) to call/handle the camera.

Hence, I would like to know whether some sort of work has been done for building Linphone with Gstreamer?

If not, then could you please guide me as to how to proceed with the project. (Replacing MediaStreamer or changing something in MediaStreamer).
Thanking in advance.

Saurav Maitra

On Tue, Oct 23, 2012 at 7:36 PM, Guillaume BERAUDO <address@hidden> wrote:

This seems a nice project.

Do you have a link to the native API documentation?

I can only found about the _javascript_ API.



> Respected Sir,
> I am currently trying to port Linphone to a* Linux based *Operating
> System based on *ARM platform* called *Tizen*.
> I have completed the build of the latest version of Linphone (3.5.2)
> and also of the mediastreamer library (version 2.8.2). When I try to
> run the same on the device, I am able to receive/transfer sound
> between two devices using pulse audio. (Though the *sound is
> accompanied with considerable amount of noise*).
> Whenever I enable the Video support of linphone, I am *unable* to
> open the web-cam of the device through  *v4l2 video filter*.
> Hence, the audio call is possible, however no video call can be made.
> (Camera does not open)
> I have observed that, linphone uses mediastreamer which in-turn uses
> msv4l and msv4l2 drivers to interact with the camera for linux PC.
> However, the Tizen (ARM & Linux based) device does not support v4l or
> v4l2 drivers. The Tizen device, however uses *Gstreamer* to open its
> native camera.
> To support video call in linphone, according to me, there can be two
> approaches and queries based on the same:
> 1. *A separate Video(WebCam) Filter* for interacting with the Tizen
> camera can be created inside mediastreamer, in this case, are there
> any examples (sample code)/demos/documentation which can help us
> *create* an effective *video
> filter* inside MediaStreamer?
> 2. An alternative to MediaStreamer called *Gstreamer* can be used. In
> this case, I would like to know,  whether, there is any version of
> Linphone which has already been built with Gstreamer support. If so,
> I would be grateful, if you could kindly share the code/ location of
> the code. Also, if not Gstreamer, is there any other streaming
> library which could be built with Linphone.
>  Additionally, the audio call is also accompanied with a lot of
> noise, and we have tried "echo cancellation"  to no avail. If there
> can be anyway, the *noise can be reduced* during the calls.
> Also, apart from these two approaches, if anything else could be done
> to enable video calling for the Tizen (ARM) based device, I would
> really appreciate if you could enlighten me with the same.
> Lastly, the I would like to thank you for taking out the time to read
> and respond to these queries.
> Any sought of help from your side would be highly appreciated.
> Expecting a positive response. Thanking you in advance for the same.
> Saurav Maitra
> IIIT-Delhi
> 2008047

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