[gst-devel] Is there any way to set FLAG in GstBuffer?
Thijs Vermeir
thijsvermeir at gmail.com
Thu Nov 6 13:22:11 CET 2008
Hi,
On Thu, Nov 6, 2008 at 12:33 PM, Irfan Shaikh
<irfanshaikh at tataelxsi.co.in> wrote:
>
> Hi,
>
> Do you mean 2 say i can use as following
>
> In gstasfparser.c {Plug-in code developed by me}
>
> if (key_frame) {
> GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
> }
No, you need to set it when there is a delta frame (not a keyframe).
>
> How does the next plug-in element Access this MACRO, so as to know if the
> FLAG is SET or RESET ?
with GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLAG_DELTA_UNIT) if there
was a delta unit
Gr,
Thijs
you can check with
> In gstasfparse.c {Next plug-in module (Under development)}
>
>
> Regards,
> Irfan
>
>
>
>
>
> -----Original Message-----
> From: Thijs Vermeir [mailto:thijsvermeir at gmail.com]
> Sent: Thu 11/6/2008 2:31 PM
> To: Discussion of the development of GStreamer
> Subject: Re: [gst-devel] Is there any way to set FLAG in GstBuffer?
>
> Hi,
>
> On Thu, Nov 6, 2008 at 9:47 AM, Irfan Shaikh
> <irfanshaikh at tataelxsi.co.in> wrote:
>>
>>
>> Hi All,
>>
>> 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 ??
>
> There is a GST_BUFFER_FLAG_DELTA_UNIT flag you should set when there
> is no keyframe in the buffer.
>
> Gr,
> Thijs
>
>> 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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>>> > by
>>> > > > you in reliance upon it, is prohibited and may be unlawful. Please
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>>> > > > copies of the message if you have received this message in error.
>>> > > >
>>> > > >
>>> >
>>> >
>>> > -------------------------------------------------------------------------
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>>> > > > challenge
>>> > > > Build the coolest Linux based applications with Moblin SDK & win
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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
>>> > intended
>>> > > recipient(s) listed above is unauthorized. If you are not the
>>> > > intended
>>> > > recipient you are hereby notified that any disclosure, copying, or
>>> > > distribution of the message, or any action taken or omission of
>>> > > action
>>> by
>>> > > you in reliance upon it, is prohibited and may be unlawful. Please
>>> > > immediately notify the sender by reply e-mail and permanently delete
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>>> > > copies of the message if you have received this message in error.
>>> > >
>>> > >
>>> -------------------------------------------------------------------------
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>>> > >
>>> >
>>> >
>>> > --
>>> > Regards,
>>> >
>>> > Sudarshan Bisht
>>> >
>>> > This message (including any attachment) is confidential and may be
>>> > legally privileged. Access to this message by anyone other than the
>>> intended
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>>> >
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>>>
>>>
>>> --
>>> Regards,
>>>
>>> Sudarshan Bisht
>>>
>>> This message (including any attachment) is confidential and may be
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>>> intended
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>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>>
>>
>>
>>
>> This message (including any attachment) is confidential and may be legally
>> privileged. Access to this message by anyone other than the intended
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>>
>
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