> ]
> 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
> <
[hidden email]>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:
[hidden email]<
[hidden email]>
> <
[hidden email]>
> > ]
>
> 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
>
> <
[hidden email]>wrote:
>
>
> > >
> > >
> > >
> >
> -----Original Message-----
> > > From:
sudarshan bisht [mailto:
[hidden email]<
[hidden email]>
> <
[hidden email]>
> > <
[hidden email]>
> > >
]
> > > 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
> > > <
[hidden email]>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:
[hidden email] <
[hidden email]> <
>
[hidden email]>
<
> >
[hidden email]> <
> > >
[hidden email]>]
> > > > 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
> > >
> > >
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> >
> > Sudarshan
Bisht
> >
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>
> Sudarshan Bisht
>
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