[gst-devel] Segmentation fault while using GST_BUFFER macros
irfanshaikh
irfanshaikh at tataelxsi.co.in
Fri Nov 7 06:20:28 CET 2008
Hi sudarshan.....
I fixed the segmentation fault......Yaa i had not allocated
size of outputbuff properly....
Now it works fine...Thanks for your help.....
Regards,
Irfan
:-)
-----Original Message-----
From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com]
Sent: Friday, November 07, 2008 10:20 AM
To: irfanshaikh at tataelxsi.co.in; Discussion of the development of
GStreamer
Subject: Re: [gst-devel] Segmentation fault while using GST_BUFFER macros
Hi Irfan
Did u check outputbuf is allocated properly as a GstBuffer ?
On Thu, Nov 6, 2008 at 9:02 PM, irfanshaikh <irfanshaikh at tataelxsi.co.in>
wrote:
Hi Sudarshan,
I was not able to do changes as you suggested to me. Instead i tried the
following. Since i just needed a flag or something which my next plug-in
element should recognize i used following.
for(m=0; m<pkt->payload_count; m++)
{
if(pkt->payloads[m].key_frame == 1)
{
g_print("Inside IF\n");
GST_BUFFER_OFFSET(outputbuf) = 1;
/*Segmentation fault*/
GST_BUFFER_FLAG_SET (outputbuf,
GST_BUFFER_FLAG_DELTA_UNIT); /*Segmentation fault*/
GST_BUFFER_DURATION(outputbuf)=(GstClockTime)1;
/*Segmentation fault*/
/*
At RTP ASF payloader check using...
GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLAG_DELTA_UNIT);
*/
g_print("In Packet Payload %d consists of KEY FRAME\n",
m);
}
}
I am not able to use any of the macros, if i use them i get a
segmentation fault. How shall i avoid Segmentation fault.
Regards,
Irfan
-----Original Message-----
From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com]
Sent: Thursday, November 06, 2008 2:14 PM
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] Size of output buffer
Hi Irfan ,
Yes this can be done in better way . Use gst_caps_new_simple
() to set the flag for key frame . You can see how asfdemux sends extradata
to decoder .( see gstasfdemux.c file ) ,
Once you do this , you can receive the same data in decoder or
next element . So in order to receive this information next element has to
register funtion using gst_pad_set_setcaps_function( ) ( just check some
decode's code which gets frame height and width from demuxer in this
manner ) .
On Thu, Nov 6, 2008 at 11:23 AM, Irfan Shaikh
<irfanshaikh at tataelxsi.co.in> wrote:
Hi sudarshan,
I have completed the asfparser plug-in code now itz working
fine as per requirrement :-)
I am only facing a small problem. I want to convey to next Plug-in
element. Whether ASF data packet i m sending to next element consists of Key
frame or no ?
For conveying this information i have thought of using following
field of GstBuffer.
guint64 offset;
I would either SET it or RESET it while pushing the data
gst_pad_push(asfparse->srcpad, outputbuf)
Is there any other convinent{feasible} way of conveying the above
information to next plug-in element {Is there some macro or Some flag that i
can use using GstBuffer before pushing outputbuf}
So as to convey to next element whether the outputbuf {consisting
ASF data packet} has a KEY frame or no ??
Regards,
Irfan
-----Original Message-----
From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com]
Sent: Thu 11/6/2008 10:55 AM
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] Size of output buffer
Hi Irfan ,
U r right data is pushed on src pad .
On Tue, Oct 21, 2008 at 6:58 PM, Irfan Shaikh
<irfanshaikh at tataelxsi.co.in>wrote:
>
> Thanks a lot Sudarshan....
>
> The sample code which you have send is really helping me a lot.
>
> If i am not wrong, I think-------- gst_pad_push(sinkpad,
my_buffer) should
> be like------ gst_pad_push(asfparse->srcpad, my_buffer).
>
> Am i corrrect ?
>
> Thanks a lot for your help and support,
> Regards,
> Irfan
>
>
>
> -----Original Message-----
> From: sudarshan bisht
[mailto:bisht.sudarshan at gmail.com<bisht.sudarshan at gmail.com>
> ]
> Sent: Tue 10/21/2008 6:44 PM
> To: Discussion of the development of GStreamer
> Subject: Re: [gst-devel] Size of output buffer
>
> Hi Irfan ,
>
> I think here no need to use circular buffer , because
the buffer
> which u receive in ur plugin , u have to unref that after properly
copying
> required buffer from that . And the buffer which ul allocate in
your
> plugin
> will be sent u next element thus will be unref by the next element
.
>
> I am writing a piece of code , may give u some hint :-
>
> asf_parser_plugin_chain(GstPad pad, GstBuffer *buffer)
> {
>
> gint packet_size=0;
> GstBuffer *my_buffer=NULL;
>
> packet_size = parse_buffer(GST_BUFFER_DATA(buffer) ); // get
> the packet size
>
> my_buffer=gst_buffer_new_and_alloc ( packet_size );
>
>
> memcpy(GST_BUFFER_DATA( my_buffer), GST_BUFFER_DATA(buffer),
packet_size
> ); // can use other APIs also provided by GstBuffer (
>
>
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstr
eamer-GstBuffer.html
> )
>
> gst_pad_push(sinkpad, my_buffer);
>
> gst_buffer_unref(buffer) ; // check if u have copied all
the data
>
> return GST_FLOW_OK ;
> }
>
>
>
>
>
>
>
>
>
>
> On Tue, Oct 21, 2008 at 5:13 PM, Irfan Shaikh
> <irfanshaikh at tataelxsi.co.in>wrote:
>
> > Hi sudarshan,
> >
> > Thanks a lot for your reply. I am pretty clear now.
> >
> > Earlier i had decided some other appoach as follows:
> > SO now i think i should not use A circular buffer,
directly i
> can
> > use the existing Gstreamer buffer ritee ??
> >
> > Thanks for your reply.
> >
> > Regarding my query :
> > 1)I have written an ASF parser code which reads an ASF
file from a
> > file location path.
> > 2)It uses fseek and fread to read the data from file in a
temperory
> > buffer
> > 3)It uses the temporary buffer to parse the ASf headers
> > 4)Lastly collect the ASF data packets after parsing the
headers
> into
> > another temperory bufffer (tempbuf).
> > 5) When i make ASF parser as gstreamer plugin, i will use
> > gst_pad_push (asfparse->srcpad, tempbuf);
> >
> > I am clear about the output interface when i make the ASF parser
as
> > gstreamer plug-in.
> >
> > Actual scenario:
> >
> > 1) Input module to ASF parser plug-in is output from
"ffmux_asf"
> > which will be in form of data buffers.
> > 2) I will need some buffer to collect these data buffers
> > 3) I thought of having a "Circular buffer" to take input
from
> > ffmux_asf.{Is it feasible to use a normal buffer like uint8_t
*Newbuf to
> > collect
> > data buffers from ffmux_asf ?? {If YES. How much memory
should i
> > allocate for NewBuf}}
> > 4) Since my application is related to Live Streaming the
buffer
> > NewBuf size can be huge.
> > 5) Circular buffer would have been useful.Since i will
free the
> > memory as soon as i read the Circular buffer.
> > 6) I can use pointer operations similar to file operations
> >
> > In gstreamer i have GstBuffer *buf, If i use circular buffer how
can i
> use
> > the existing "buf".
> >
> > Regards,
> > Irfan.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: sudarshan bisht
[mailto:bisht.sudarshan at gmail.com<bisht.sudarshan at gmail.com>
> <bisht.sudarshan at gmail.com>
> > ]
> > Sent: Tue 10/21/2008 4:53 PM
> > To: Discussion of the development of GStreamer
> > Subject: Re: [gst-devel] Size of output buffer
> >
> > HI Irfan ,
> > You are trying to write a ASF Parser plugin which
will be
> > used
> > after ffmux_asf in pipeline .
> > Now you want to parse data packets and send them to next
element .
> >
> > The buffer you get from ffmux_asf is already allocated so you
dont
> need
> > to allocated a separate buffer for that .
> > To know the size of input buffer in your ASF Parser plugin
you can use
> > GST_BUFFER_SIZE(buffer) .
> > So now you have to parse data part of this buffer , because
data
> part
> > of the buffer have the actual data .
> > For your outgoing packets allocate one more GstBuffer and
copy the
> > required number of bytes of data from received buffer to this
buffer and
> > push this buffer to next element.
> >
> > You can use adapter APIs also to make it simpler . Read
GstBuffer APIs
> > thoroughly for good practice.
> >
> >
> >
> > On Tue, Oct 21, 2008 at 3:59 PM, Irfan Shaikh
> > <irfanshaikh at tataelxsi.co.in>wrote:
> >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: sudarshan bisht
[mailto:bisht.sudarshan at gmail.com<bisht.sudarshan at gmail.com>
> <bisht.sudarshan at gmail.com>
> > <bisht.sudarshan at gmail.com>
> > > ]
> > > Sent: Tue 10/21/2008 2:25 PM
> > > To: Discussion of the development of GStreamer
> > > Subject: Re: [gst-devel] Size of output buffer
> > >
> > > Hi
> > >
> > > "gst_pad_push_event" function pushes only events ( EOS , new
segment
> etc
> > )
> > > not buffer , in order to push buffer use "gst_pad_push" api .
> > >
> > > On Tue, Oct 21, 2008 at 1:58 PM, Irfan Shaikh
> > > <irfanshaikh at tataelxsi.co.in>wrote:
> > >
> > > >
> > > > Hi Julien,
> > > >
> > > > Thanks for your reply..
> > > >
> > > > For ffmux_asf plug-in in gstffmpegmux.c.
> > > >
> > > > Is "gst_pad_push_event" is the fuction which pushes the
buffer
> > which
> > > > has ASF data into sink pad of next elemnt ?
> > > > i.e. gst_pad_push_event (ffmpegmux->srcpad,
gst_event_new_eos
> ());
> > > > When i checked the sise of buffer its variable in size.
> > > >
> > > >
> > > > I need to allocate buffer for the next module to
"ffmux_asf".
> > Which
> > > > is an asf parse. i need to allocate buffer in asf parser
plugin. I
> > wanted
> > > to
> > > > know what size of buffer should i allocate for ASF parser
plug-in to
> > take
> > > > i/p from ffmux_asf
> > > >
> > > > I checked the buffer size in ffmux_asf in
gst_ffmpegmux_collected
> > > > (GstCollectPads * pads, gpointer user_data)
> > > >
> > > > But it shows variable part. Tell me whether i am right ??
> > > >
> > > > Size of buf:5757
> > > > Size of buf:7134
> > > > Size of buf:6927
> > > > Size of buf:5670
> > > > Size of buf:4989
> > > > Size of buf:4004
> > > > Size of buf:3615
> > > > Size of buf:3188
> > > > Size of buf:3022
> > > > Size of buf:2703
> > > >
> > > > Thanks and regards,
> > > > Irfan
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Julien Puydt [mailto:jpuydt at free.fr <jpuydt at free.fr>
<
> jpuydt at free.fr> <
> > jpuydt at free.fr> <
> > > jpuydt at free.fr>]
> > > > Sent: Mon 10/20/2008 3:29 PM
> > > > To: Discussion of the development of GStreamer
> > > > Subject: Re: [gst-devel] Size of output buffer
> > > >
> > > > irfanshaikh a écrit :
> > > > > How can i find size of output buffer in
"ffmux_asf" which
> is
> > > > pushed
> > > > > to the sink pad of next element ?
> > > >
> > > > GST_BUFFER_SIZE (buffer) ?
> > > >
> > > > Snark on #gstreamer
> > > >
> > > >
>
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> > >
> > > --
> > > Regards,
> > >
> > > Sudarshan Bisht
> > >
> > >
> > > Hi sudarshan/Ved,
> > >
> > > In gstffmpegmux.c {gst-ffmpeg-0.10.5/ext/ffmpeg} i do
not see any
> > > "gst_pad_push" function.
> > >
> > > I understand we need a function something like "gst_pad_push
> > > (asfmux->srcpad, buf)", so as to push the buffer to the sink
pad of
> next
> > > module.
> > >
> > > But i do not find any such api in gstffmpegmux.c.
> > >
> > > So i am unable to find the size of output buffer which is send
to the
> > next
> > > module.So i got confused with "gst_pad_push_event"
> > >
> > > Please can you help me regarding this issue.
> > >
> > > I need all this information to allocate buffer size for my
module "ASF
> > > parser" which is built from scratch in C. rite know i am
reading from
> > file.
> > >
> > > I need to do same processing in ASF parser when i use
ffmux_asf as
> input
> > > module for ASF parser.
> > >
> > > Please help me regarding this.
> > >
> > >
> > > Regards,
> > > Irfan
> > >
> > > This message (including any attachment) is confidential and
may be
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than the
> > intended
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> > --
> > Regards,
> >
> > Sudarshan Bisht
> >
> > This message (including any attachment) is confidential and
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>
> Sudarshan Bisht
>
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