how to read/write property of alsasink from application

[Mandeep Sandhu]

> So,
> I have to add code for my application to set "audio-sink" property of
> playbin2. then my application has the point of alsasink, right?

correcto!

> when I would like to read/write property of alsasink, the point will
> be used for the purpose in application, right?

correcto again! :)

-mandeep

>
> Thank you very much!
>
> Best Regards,
> Soho
>
>
>
> 2013/1/21 Mandeep Sandhu <mandeepsandhu.chd at gmail.com>:
>> On Mon, Jan 21, 2013 at 8:02 AM, Soho Soho123 <soho123.2012 at gmail.com> wrote:
>>> Hi Tim,
>>>
>>> Yes, you are right.
>>> But my problem is:
>>> if pipe I used :gst-launch-0.10 playbin2 url=....
>>> then the elements that be constructed in pipe are automatically, right?
>>> that inicludes alsasink element.
>>> If I created alsasink element by myself, then
>>> I have to pass the point to playbin2, right?
>>> how to let playbin2 know the audio sink is the alsasink that I created
>>> by myself,
>>> NOT use the element that auto created?
>>
>> As Tim pointed out, this happens when you _explicitly_ set the audio
>> sink element on playbin2 by calling:
>>
>> <snip>
>> GstElement *alsasink = gst_element_factory_make ("alsasink", NULL);
>>
>> and then set it on playbin (=the pipeline) with
>>
>> g_object_set (playbin, "audio-sink", alsasink, NULL);
>> </snip>
>>
>> From this point onwards, playbin2 will use this as the audio sink, and
>> not use the one created internally.
>>
>> Do a gst-inspect on playbin2 and see what this ("audio-sink") property does.
>>
>> We do something similar, where we want to explicitly set a custom
>> video sink and control the sinks properties sometime later.
>>
>> HTH,
>> -mandeep
>>
>>> Could you kindly help to explain more detail?
>>>
>>> Thank you very much!!
>>>
>>> Best Regards,
>>> Soho
>>>
>>> 2013/1/20 Tim-Philipp Müller <t.i.m at zen.co.uk>:
>>>> On Sun, 2013-01-20 at 00:13 +0800, Soho Soho123 wrote:
>>>>
>>>> Hi,
>>>>>
>>>>> If my application uses the pipe like "gst-launch-0.10 playbin url=.....", then
>>>>
>>>> You should use playbin2 uri=... really, not the old playbin.
>>>>
>>>>
>>>>> is there any method that I can read/write property of alsasink from
>>>>> main of application?
>>>>>  Does someone have idea?
>>>>> Because I have to tell alsa to do someting while audio playback!
>>>>
>>>> The easiest way would be to create the alsasink yourself using
>>>>
>>>>  GstElement *alsasink = gst_element_factory_make ("alsasink", NULL);
>>>>
>>>> and then set it on playbin (=the pipeline) with
>>>>
>>>> g_object_set (playbin, "audio-sink", alsasink, NULL);
>>>>
>>>> Then you can keep the alsasink pointer around and use
>>>>
>>>>   g_object_set (alsasink, "property-name", value, NULL);
>>>> or
>>>>   g_object_get (alsasink, "property-name", &value, NULL);
>>>>
>>>> (though many of the values can probably only be manipulated while
>>>> alsasink is in NULL state, not while it's being used for output).
>>>>
>>>> Cheers
>>>>  -Tim
>>>>
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> gstreamer-devel at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel