Segment event generation at source plugin (Push mode)

[AshishS]

Hi Muller, 

Thanks for the advice.

Below are details.

I am writing a source plugin derived from GstBaseSrc

GObject
 +----GstObject
       +----GstElement
             +----GstBaseSrc
                   +----GstMySrc

I wan't plugin to play media from http stream (Play/Pause/Stop is working
fine, Seeks are not allowed), Plugin will be initiated in push mode with
GST_FORMAT_BYTES as supported format and check_get_range() is set to false.
Now while normal play i want to Fast forward with different speeds.


I tried pushing the new segment event but it failed at audiosink with format
not supported message. Below sample code, i was pushing this event while
pipeline in playing state and from my source plugin's create() call. 


        GstEvent * newSegEvent = gst_event_new_new_segment(FALSE, 2.0 ,
GST_FORMAT_BYTES, 0, -1 , currentBytePosInStream);

          result = gst_pad_push_event (pad, newSegEvent);



Then i tried gst_base_src_new_seamless_segment() which works fine first
time, but not consistent when i re change the play speed.

So, please let me know how to go about it, please do let me know if you need
more details.


Thanks,
Ashish S


Tim Müller wrote
> On Wed, 2014-09-10 at 05:53 -0700, AshishS wrote:
> 
> Hi,
> 
> the reason you might not be getting any response to your questions is
> that it's really quite unclear what you are trying to do exactly. If you
> tell us a bit more about what kind of element you're writing and what
> you are trying to do exactly, people can probably point you in the right
> direction. It would also be good to know which GStreamer version you're
> using.
> 
> It is quite unlikely that you will need to use new_seamless_segment()
> unless you're writing a DVD source or similar.
> 
> Cheers
>  -Tim
> 
>> 
>> I am using below
>> 
>> =======
>> /**
>>  * gst_base_src_new_seamless_segment:
>>  * @src: The source
>>  * @start: The new start value for the segment
>>  * @stop: Stop value for the new segment
>>  * @position: The position value for the new segent
>>  *
>>  * Prepare a new seamless segment for emission downstream. This function
>> must
>>  * only be called by derived sub-classes, and only from the create()
>> function,
>>  * as the stream-lock needs to be held.
>>  *
>>  * The format for the new segment will be the current format of the
>> source,
>> as
>>  * configured with gst_base_src_set_format()
>>  *
>>  * Returns: %TRUE if preparation of the seamless segment succeeded.
>>  *
>>  * Since: 0.10.26
>>  */
>> gboolean
>> gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64
>> stop,
>>     gint64 position)
>> ======
>> 
>> I am calling this from create function in my source plugin,
>> 
>> when i call as below first time:-
>> ===
>> basesrc->segment.rate = 2.0;
>> ret = gst_base_src_new_seamless_segment(basesrc, 0, stopPos : -1,
>> currPos)
>> ===
>> Media play immediately with 2x speed, now when I want to reset to 1.0
>> rate,
>> i do below
>> ===
>> basesrc->segment.rate = 1.0;
>> ret = gst_base_src_new_seamless_segment(basesrc, 0, stopPos : -1,
>> currPos)
>> ===
>> This time play hang's around for  5min, then starts playing at 1x speed.
>> 
>> Why play hangs, what is going wrong here please let me know? except the
>> comment for the function in "gstbasesrc.c" i did not found any much
>> information how it works.
>> 
>> Please let me know the correct behavior and some knowledge sharing on the
>> same
>> 
>> Thanks
>> Ashish S
>> 
>> 
>> 
>> --
>> View this message in context:
>> http://gstreamer-devel.966125.n4.nabble.com/Segment-event-generation-at-source-plugin-Push-mode-tp4668625p4668634.html
>> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>> _______________________________________________
>> gstreamer-devel mailing list
>> 

> gstreamer-devel at .freedesktop

>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> 
> -- 
> Tim Müller, Centricular Ltd - http://www.centricular.com
> 
> _______________________________________________
> gstreamer-devel mailing list

> gstreamer-devel at .freedesktop

> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel





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