[gst-devel] Size of output buffer
sudarshan bisht
bisht.sudarshan at gmail.com
Thu Nov 6 09:44:08 CET 2008
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/gstreamer-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
> > > > legally privileged. Access to this message by anyone other than the
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> > > --
> > > Regards,
> > >
> > > Sudarshan Bisht
> > >
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> > --
> > Regards,
> >
> > Sudarshan Bisht
> >
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> Regards,
>
> Sudarshan Bisht
>
>
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--
Regards,
Sudarshan Bisht
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