[gst-devel] How to implement a pull-based sink?
Hsu France
france.hsu.b at gmail.com
Fri Feb 5 09:46:25 CET 2010
Hi! Tim,
Thanks for your reply.
I would misunderstand the meaning of "pull-mode sink".
You mean, pull-mode and buffer allocated by sink are two different things,
right?
In the fact, my sink is for a HW device, so I want the source to use the HW
buffer (allocated in sink) for data flow, not to allocate by source itself.
I wish to use udpsrc for the pipeline, and found it is based on GstPushSrc.
(Therefore, I thought I should implement a pull-based sink, and find a
pull-based source)
$ gst-launch udpsrc udp://IP:PORT ! mysink
However, my buffer_alloc function is not called.
France Hsu
> Hi,
>
> > I'm a newbie for gstreamer and working on a sink that I wish it would
> > provide buffer for source. I think it would be a pull-based sink.
> > (...)
> > I implemented this sink based on base-sink, and added the virtual
> > function: buffer_alloc() (gst_my_sink_buffer_alloc) and render()
> > (gst_my_sink_render).
>
> What kind of sink is this?
>
> There's no need for the sink to operate in pull mode to be able to
> provide buffers to upstream. It should be sufficient to implement a
> buffer alloc function.
>
> Take for example:
>
> $ GST_DEBUG=*src:5,*sink:5 videotestsrc num-buffers=2 ! ximagesink
>
> This will operate in push mode, but videotestsrc will call
> gst_pad_alloc_buffer() to get a buffer from ximagesink and then fill
> that with data and push it back to ximagesink.
>
> Pull mode for sinks is something that's not really used much in practice
> and is rarely useful. Maybe you could provide some more details of what
> you're trying to do?
>
> Cheers
> -Tim
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 4 Feb 2010 08:51:07 -0800 (PST)
> From: na <nahmed31 at hotmail.com>
> Subject: [gst-devel] h264 playback, qtdemux issue
> To: gstreamer-devel at lists.sourceforge.net
> Message-ID: <1265302267125-1469069.post at n4.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hello,
>
> I am new to gstreamer and I wanted to setup a pipeline that can playback an
> h.264 video that is encapsulated within an MP4 container.
>
> I am using the following command:
>
> gst-launch -v --gst-debug-level=2 filesrc
> location=hdv_0015_480p_384kbps_20fps.mp4 ! qtdemux ! ffdec_h264 !
> ximagesink
>
> I have attached the console output below. Any help is greatly appreciated.
> Thanks.
>
> Best regards,
>
> Nadeem
>
> ----------------------
>
> gst-launch -v --gst-debug-level=2 filesrc
> location=hdv_0015_480p_384kbps_20fps.mp4 ! qtdemux ! ffdec_h264 !
> ximagesink
> Setting pipeline to PAUSED ...
> 0:00:00.128491689 2421 0x91fcb78 WARN qtdemux
> qtdemux_types.c:154:qtdemux_type_get: unknown QuickTime node type avc1
> 0:00:00.128991982 2421 0x91fcb78 WARN qtdemux
> qtdemux_types.c:154:qtdemux_type_get: unknown QuickTime node type avcC
> 0:00:00.129232998 2421 0x91fcb78 WARN qtdemux
> qtdemux.c:3186:qtdemux_parse_container:<qtdemux0> length too long (1572864
> >
> 28)
> 0:00:00.129468726 2421 0x91fcb78 WARN qtdemux
> qtdemux.c:3186:qtdemux_parse_container:<qtdemux0> length too long (1507328
> >
> 27)
> 0:00:00.130451079 2421 0x91fcb78 WARN qtdemux
> qtdemux.c:4907:qtdemux_parse_trak:<qtdemux0> unknown version 00000000
> /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:sink: caps =
> video/x-h264,
>
> codec_data=(buffer)01404033ffe1001d674d40339a7406c1ef3fffdd0fdd9a880000030008000003014478c19501000468ee3c80,
> width=(int)852, height=(int)480, framerate=(fraction)143/7,
> pixel-aspect-ratio=(fraction)847/852
> Pipeline is PREROLLING ...
> /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:src: caps =
> video/x-raw-yuv, width=(int)852, height=(int)480,
> framerate=(fraction)143/7,
> format=(fourcc)I420, interlaced=(boolean)false,
> pixel-aspect-ratio=(fraction)847/852
> 0:00:00.229889863 2421 0x91fcb78 WARN qtdemux
> qtdemux.c:2645:gst_qtdemux_loop:<qtdemux0> error: streaming stopped, reason
> not-negotiated
> ERROR: from element /GstPipeline:pipeline0/GstQTDemux:qtdemux0: GStreamer
> encountered a general stream error.
> Additional debug info:
> qtdemux.c(2645): gst_qtdemux_loop ():
> /GstPipeline:pipeline0/GstQTDemux:qtdemux0:
> streaming stopped, reason not-negotiated
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:src: caps = NULL
> /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:sink: caps = NULL
> /GstPipeline:pipeline0/GstQTDemux:qtdemux0.GstPad:audio_00: caps = NULL
> /GstPipeline:pipeline0/GstQTDemux:qtdemux0.GstPad:video_00: caps = NULL
> Freeing pipeline ...
>
> --
> View this message in context:
> http://n4.nabble.com/h264-playback-qtdemux-issue-tp1469069p1469069.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 4 Feb 2010 09:13:05 -0800
> From: Michael Smith <msmith at xiph.org>
> Subject: Re: [gst-devel] h264 playback, qtdemux issue
> To: Discussion of the development of GStreamer
> <gstreamer-devel at lists.sourceforge.net>
> Message-ID:
> <3c1737211002040913m11f1f78cxda4f349b660f1c89 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Thu, Feb 4, 2010 at 8:51 AM, na <nahmed31 at hotmail.com> wrote:
> >
> > Hello,
> >
> > I am new to gstreamer and I wanted to setup a pipeline that can playback
> an
> > h.264 video that is encapsulated within an MP4 container.
> >
> > I am using the following command:
> >
> > gst-launch -v --gst-debug-level=2 filesrc
> > location=hdv_0015_480p_384kbps_20fps.mp4 ! qtdemux ! ffdec_h264 !
> ximagesink
>
> Use xvimagesink. In general it's also a good idea to have
> ffmpegcolorspace in between the decoder and the video sink in case the
> decoder is outputting a format that the sink can't accept.
>
> Mike
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 04 Feb 2010 18:14:44 +0100
> From: Wim Taymans <wim.taymans at gmail.com>
> Subject: Re: [gst-devel] h264 playback, qtdemux issue
> To: Discussion of the development of GStreamer
> <gstreamer-devel at lists.sourceforge.net>
> Message-ID: <1265303684.3283.100.camel at metal>
> Content-Type: text/plain; charset="UTF-8"
>
> On Thu, 2010-02-04 at 08:51 -0800, na wrote:
> > Hello,
> >
> > I am new to gstreamer and I wanted to setup a pipeline that can playback
> an
> > h.264 video that is encapsulated within an MP4 container.
> >
> > I am using the following command:
> >
> > gst-launch -v --gst-debug-level=2 filesrc
> > location=hdv_0015_480p_384kbps_20fps.mp4 ! qtdemux ! ffdec_h264 !
> ximagesink
> >
>
> Add ffmpegcolorspace before ximagesink or use:
>
> gst-launch playbin2 uri=file:///path/to/file.mp4
>
> Wim
>
> > I have attached the console output below. Any help is greatly
> appreciated.
> > Thanks.
> >
> > Best regards,
> >
> > Nadeem
> >
> > ----------------------
> >
> > gst-launch -v --gst-debug-level=2 filesrc
> > location=hdv_0015_480p_384kbps_20fps.mp4 ! qtdemux ! ffdec_h264 !
> ximagesink
> > Setting pipeline to PAUSED ...
> > 0:00:00.128491689 2421 0x91fcb78 WARN qtdemux
> > qtdemux_types.c:154:qtdemux_type_get: unknown QuickTime node type avc1
> > 0:00:00.128991982 2421 0x91fcb78 WARN qtdemux
> > qtdemux_types.c:154:qtdemux_type_get: unknown QuickTime node type avcC
> > 0:00:00.129232998 2421 0x91fcb78 WARN qtdemux
> > qtdemux.c:3186:qtdemux_parse_container:<qtdemux0> length too long
> (1572864 >
> > 28)
> > 0:00:00.129468726 2421 0x91fcb78 WARN qtdemux
> > qtdemux.c:3186:qtdemux_parse_container:<qtdemux0> length too long
> (1507328 >
> > 27)
> > 0:00:00.130451079 2421 0x91fcb78 WARN qtdemux
> > qtdemux.c:4907:qtdemux_parse_trak:<qtdemux0> unknown version 00000000
> > /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:sink: caps =
> > video/x-h264,
> >
> codec_data=(buffer)01404033ffe1001d674d40339a7406c1ef3fffdd0fdd9a880000030008000003014478c19501000468ee3c80,
> > width=(int)852, height=(int)480, framerate=(fraction)143/7,
> > pixel-aspect-ratio=(fraction)847/852
> > Pipeline is PREROLLING ...
> > /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:src: caps =
> > video/x-raw-yuv, width=(int)852, height=(int)480,
> framerate=(fraction)143/7,
> > format=(fourcc)I420, interlaced=(boolean)false,
> > pixel-aspect-ratio=(fraction)847/852
> > 0:00:00.229889863 2421 0x91fcb78 WARN qtdemux
> > qtdemux.c:2645:gst_qtdemux_loop:<qtdemux0> error: streaming stopped,
> reason
> > not-negotiated
> > ERROR: from element /GstPipeline:pipeline0/GstQTDemux:qtdemux0: GStreamer
> > encountered a general stream error.
> > Additional debug info:
> > qtdemux.c(2645): gst_qtdemux_loop ():
> > /GstPipeline:pipeline0/GstQTDemux:qtdemux0:
> > streaming stopped, reason not-negotiated
> > ERROR: pipeline doesn't want to preroll.
> > Setting pipeline to NULL ...
> > /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:src: caps = NULL
> > /GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:sink: caps = NULL
> > /GstPipeline:pipeline0/GstQTDemux:qtdemux0.GstPad:audio_00: caps = NULL
> > /GstPipeline:pipeline0/GstQTDemux:qtdemux0.GstPad:video_00: caps = NULL
> > Freeing pipeline ...
> >
>
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 04 Feb 2010 17:27:36 +0000
> From: Tim-Philipp M?ller <t.i.m at zen.co.uk>
> Subject: Re: [gst-devel] h264 playback, qtdemux issue
> To: gstreamer-devel at lists.sourceforge.net
> Message-ID: <1265304456.3607.32.camel at zingle>
> Content-Type: text/plain; charset="UTF-8"
>
> On Thu, 2010-02-04 at 18:14 +0100, Wim Taymans wrote:
>
> > Add ffmpegcolorspace before ximagesink or use:
>
> If you use ximagesink (and not e.g. xvimagesink), a videoscale may also
> be needed, in case the image needs to be scaled to accommodate the
> aspect ratio.
>
> Cheers
> -Tim
>
>
>
>
> ------------------------------
>
>
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business
> Choose flexible plans and management services without long-term contracts
> Personal 24x7 support from experience hosting pros just a phone call away.
> http://p.sf.net/sfu/theplanet-com
>
> ------------------------------
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
> End of gstreamer-devel Digest, Vol 45, Issue 8
> **********************************************
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20100205/f240e8a6/attachment.htm>
More information about the gstreamer-devel
mailing list