how to release the GstBuffer memory

[trinadh Pala]

Hello Martin,

Thanks for your reply. I will try to install the appsrc library and see. I will now mix QtGstreamer libraries and gst libraries and see. As you mentioned, QtGstreamer is only a wrapper around the gstreamer library. As I had mentioned in my earlier mail QGst::Buffer::create() is creating and allocating but did not notice any g_free mentioned in that function.  The appsrc library I was using was in Qt gstreamer utils. now I have to see how to get this gst/appsrc. 

I wish someone doing the QtGstreamer wrapper library responds to the question.

Many thanks
Trinadh.




________________________________
 From: Angel Martin <amartin at vicomtech.org>
To: trinadh Pala <me_wavelet at yahoo.co.uk>; Discussion of the development of and with GStreamer <gstreamer-devel at lists.freedesktop.org> 
Sent: Wednesday, 26 June 2013, 8:06
Subject: Re: how to release the GstBuffer memory
 

As far as i understood you can mix gstreamer baseline code with QT and
use QT Objects as sinks but I've never used QT wrapper of gstreamer.
The code that I posted fixes the memory leak for sure.

2013/6/25 trinadh Pala <me_wavelet at yahoo.co.uk>:
> Hello Angel Martin & all,
>
> I have gone through the program that was in the link below. This program is
> playing some 300 video frames and after that it stops. So if there is any
> memory leak, it may not be able to indicate. So I am not sure whether this
> program has been tested for memory leak. It is not clear to me how the
> buffer release was implemented. If I call g_free(pointer). or
> m_buffer->clear in my program after pushing the buffer to the pipeline, the
> program exits. if I do not use g_free or m_buffer->clear then the program
> continues to send the ts data to the down stream elemets and decoding
> happens properly except for the problem of leaking memory. I am stuck with
> the problem for a couple of day, the application is no use without fixing
> this memory leak. Please help.
>
> Thanks and regards
> Trinadh
>
>
> ________________________________
> From: Angel Martin <amartin at vicomtech.org>
> To: trinadh Pala <me_wavelet at yahoo.co.uk>; Discussion of the development of
> and with GStreamer <gstreamer-devel at lists.freedesktop.org>
> Sent: Tuesday, 25 June 2013, 16:21
> Subject: Re: how to release the GstBuffer memory
>
> Hi,
>
> Here you will find the proper way:
>
> http://users.design.ucla.edu/~acolubri/test/gstreamer/appsrc_filesink.c
> /* used to inject a new buffer into the pipeline */
> static void
> inject_new_buffer_into_pipeline (ProgramData * data)
> {
>   guint size;
>   gpointer raw_buffer;
>   GstBuffer *app_buffer;
>   GstElement *source;
>
>   size = 80 * 60 * 4; // 80x60 pixels, 32 bpp.
>   g_print ("Pushing a buffer of size %d\n", size);
>
>   // Allocating the memory for the buffer.
>   raw_buffer = g_malloc0 (size);
>
>   app_buffer = gst_app_buffer_new (raw_buffer, size, g_free, raw_buffer);
>
>   /* newer basesrc will set caps for use automatically but it does not
> really
>   * hurt to set it on the buffer again */
>   gst_buffer_set_caps (app_buffer, gst_caps_from_string (video_caps));
>
>   /* get source an push new buffer */
>   source = gst_bin_get_by_name (GST_BIN (data->sink), "testsource");
>   gst_app_src_push_buffer (GST_APP_SRC (source), app_buffer);
> }
>
> 2013/6/25 trinadh Pala <me_wavelet at yahoo.co.uk>:
>> Hello,
>>
>> I am writing an application using QtGstreamer library.
>>
>> I am implemeting a media player application. i am using Appsource for
>> linking the source. The data is available in a char *buffer.
>>
>> I created  a buffer using  QGst::Buffer::create(size).
>> // pBuf has the Transport stream data char *pBuf
>> // This piece of code is in a loop.
>>
>>  QGst::BufferPtr m_buffer;
>>    m_buffer=QGst::Buffer::create(buf_size);
>>
>>    quint8 *m_data_ptr=m_buffer->data();
>>
>>    memcpy(m_data_ptr,pBuf,buf_size);
>>
>>    if(this->m_player->m_pipeline);
>>
>>          ret = this->m_player->m_appsrc.pushBuffer(m_buffer);
>>
>>        if (!m_buffer.isNull())
>>            {
>>        if (ret != QGst::FlowOk)
>>                {
>>        /* some error, stop sending data */
>>                qDebug("some error");
>>                }
>>            else
>>                {
>>                qDebug("pushed a buffer successfully");
>>
>>                }
>>            }
>>
>>
>> The method works, i am able to display the video. However, I did not know
>> how to release the buffer created. so the application leaks memory. How to
>> release the Buffer, after pushBuffer. Please help.
>>
>> Thanks and regards
>> Trinadh
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
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