gstreamer-devel Digest, Vol 15, Issue 56
Andol Li
yandol at hotmail.com
Wed Apr 25 05:47:57 PDT 2012
hi everyone,
I am Andol, currently a phd in huddersfield university in UK. The project I am about to do is about implementing opencv-based hand gesture recognition functions in a gstreamer plugin. my nick name in IRC is andol, my blog is
http://www.andol.info/ , and the repository I am going to host my codes is github
https://github.com/yandol/gstreamer-hand-recognitionI wish my work could provide some interesting features to gstreamer in terms of multimedia interactions .looking forward to working with you guys.
cheers
Andol
===yandol at hotmail.comhttp://www.andol.info
> From: gstreamer-devel-request at lists.freedesktop.org
> Subject: gstreamer-devel Digest, Vol 15, Issue 56
> To: gstreamer-devel at lists.freedesktop.org
> Date: Tue, 24 Apr 2012 09:12:41 -0700
>
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> Today's Topics:
>
> 1. GSoC students welcome (Stefan Sauer)
> 2. Re: Audio Metadata (Stefan Sauer)
> 3. Re: GSoC students welcome (Peteris Krisjanis)
> 4. wavparser not negotiate with my plugin (rajashekar)
> 5. Re: Audio Metadata (Sree Gowri)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 24 Apr 2012 14:13:05 +0200
> From: Stefan Sauer <ensonic at hora-obscura.de>
> Subject: GSoC students welcome
> To: gstreamer-devel <gstreamer-devel at lists.freedesktop.org>
> Message-ID: <4F9698D1.1060401 at hora-obscura.de>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> this year we have 8 students working on various topics during the Google
> summer of code program. Welcome from the gstreamer community. I'd like
> to ask the students to introduce them self (just reply to this mail).
> Please tell a little about the work you are going to do, what your
> nickname in IRC is, where you have your blog and where you will host
> your code (e.g. github).
>
> Happy hacking!
>
> Stefan
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 24 Apr 2012 14:16:16 +0200
> From: Stefan Sauer <ensonic at hora-obscura.de>
> Subject: Re: Audio Metadata
> To: gstreamer-devel at lists.freedesktop.org
> Message-ID: <4F969990.5090001 at hora-obscura.de>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On 04/24/2012 11:18 AM, Sree Gowri wrote:
> >
> >
> > On Mon, Apr 16, 2012 at 12:53 AM, Stefan Sauer
> > <ensonic at hora-obscura.de <mailto:ensonic at hora-obscura.de>> wrote:
> >
> > On 04/12/2012 06:23 AM, Sree Gowri wrote:
> >> Hi,
> >>
> >> I am trying to extract audio metadata like
> >> streamurl,streamtitle,artist,genre,album.However I am not able to
> >> extract the metadata using GstTagList. Below is the snippet of
> >> the code. Does anyone suggest what are the additions to be done
> >> in order to extract the metadata?
> >>
> >> Only the following data has been extracted.
> >> layer: 3
> >> mode: joint
> >> emphasis: none
> >> audio codec: MPEG-1 layer 3
> >> bitrate: 128000
> >>
> >> Pipeline is as follows:
> >>
> >> [code]
> >> app->pipeline= gst_parse_launch("appsrc name=mysource !
> >> audio/mpeg ! mad ! alsasink", NULL);
> >> [/code]
> > "appsrc name=mysource ! audio/mpeg ! mp3parse ! mad ! alsasink"
> > or even better
> > "appsrc name=mysource ! audio/mpeg ! decodebin2! alsasink"
> >
> > Stefan
> >
> >>
> >> Audio data fed to the appsrc element
> >>
> >> [code]
> >> buf =( GstBuffer *) gst_app_buffer_new (data, READBUF, g_free, data);
> >> g_signal_emit_by_name (GST_APP_SRC (app->appsrc), "push-buffer",
> >> buf, &ret);
> >> [/code]
> >>
> >> Bus message
> >>
> >> [code]
> >> case GST_MESSAGE_TAG:
> >> {
> >> GstTagList *tags = NULL;
> >> char *artist;
> >> gst_message_parse_tag (message, &tags);
> >> g_print ("Got tags from element %s:\n", GST_OBJECT_NAME
> >> (message->src));
> >> if (gst_tag_list_get_string (tags, GST_TAG_ARTIST, &artist))
> >> {
> >> printf("got artist: %s\n",artist);
> >> }
> >> else
> >> {
> >> printf("no artist!! \n");
> >> }
> >> gst_tag_list_foreach (tags, print_tag, NULL);
> >> g_print ("\n");
> >> gst_tag_list_free (tags);
> >> break;
> >> [/code]
> >>
> >> print_tag function code
> >> [code]
> >> static void print_tag (const GstTagList * list, const gchar *
> >> tag, gpointer unused)
> >> {
> >> gint i, count;
> >> count = gst_tag_list_get_tag_size (list, tag);
> >> for (i = 0; i < count; i++) {
> >> gchar *str;
> >> if (gst_tag_get_type (tag) == G_TYPE_STRING) {
> >> if (!gst_tag_list_get_string_index (list, tag, i, &str))
> >> g_assert_not_reached ();
> >>
> >> } else {
> >> str =
> >> g_strdup_value_contents (gst_tag_list_get_value_index
> >> (list, tag, i));
> >> }
> >> if (i == 0) {
> >> g_print (" %15s: %s\n", gst_tag_get_nick (tag), str);
> >> } else {
> >> g_print (" : %s\n", str);
> >> }
> >> g_free (str);
> >> }
> >> }
> >> [/code]
> >>
> >> Thanks and Regards,
> >> Sree Gowri
> >
> > Hi stephan,
> >
> > First would like to thank you for the input you provided.
> >
> > I tried both the pipelines that you have mentioned,however meta
> > data has not been extracted.
> >
> > Kindly request you to let me know if there are any other changes
> > that needs to be done.
>
> Are you sure the stream you are looking at is tagged with such metadata?
> Try gst-launch-0.10 -t playbin2 uri=...
>
> Stefan
>
> >
> > Regards,
> > Sree Gowri
> >
> >
> >>
> >> _______________________________________________
> >> gstreamer-devel mailing list
> >> gstreamer-devel at lists.freedesktop.org <mailto:gstreamer-devel at lists.freedesktop.org>
> >> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > <mailto:gstreamer-devel at lists.freedesktop.org>
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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> ------------------------------
>
> Message: 3
> Date: Tue, 24 Apr 2012 17:04:59 +0300
> From: Peteris Krisjanis <pecisk at gmail.com>
> Subject: Re: GSoC students welcome
> To: Stefan Sauer <ensonic at hora-obscura.de>
> Cc: gstreamer-devel <gstreamer-devel at lists.freedesktop.org>
> Message-ID: <1335276299.9959.30.camel at pecisk.vsaa.lv>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi everyone!
>
> I'm Peteris Krisjanis, student from University of Latvia. I will
> implement Gstreamer based waveform widget, which could be used then by
> other applications to show waveform data. I plan to support caching for
> faster waveform redrawing, and to allow customisation, like having
> different wavform styles and adding overlays as cursors, fade points,
> etc.
>
> My nick at freenode IRC (and elsewhere) is pecisk, my blog is
> pecisk.blogspot.com, and I plan to host my code in github
> https://github.com/Pecisk/waveformwidget.
>
> See ya,
> Peter.
>
> O , 2012-04-24 14:13 +0200, Stefan Sauer rakst?ja:
> Hi,
> >
> > this year we have 8 students working on various topics during the
> Google
> > summer of code program. Welcome from the gstreamer community. I'd like
> > to ask the students to introduce them self (just reply to this mail).
> > Please tell a little about the work you are going to do, what your
> > nickname in IRC is, where you have your blog and where you will host
> > your code (e.g. github).
> >
> > Happy hacking!
> >
> > Stefan
> >
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 24 Apr 2012 07:37:22 -0700 (PDT)
> From: rajashekar <rajashekar.alusa at gmail.com>
> Subject: wavparser not negotiate with my plugin
> To: gstreamer-devel at lists.freedesktop.org
> Message-ID: <1335278242961-4583694.post at n4.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> hi all,
> i wrote a plugin name my_plugin, it just push the buffer's to soruce pad
> whatever it receives on sinkpad.
>
> the capabilities of source pad & sink pad are same, i.e.,
> audio/x-raw-int,
> signed = true, width = 16, depth = 16, rate = 8000, channels = [ 1, 2] ;
>
>
> now pipeline is :
>
> gst-launch filesrc location=file.wav ! wavparse ! my_plugin ! alsasink
>
> then it shows error message is
>
> pipeline is prerolling...
> error from element Gstpipeline0: /pipeline/gstwavparse : wavparse0 :
> internal data flow error
> Additional debug info :
> gstwavparse.c(2048) : in gst_wavparse_loop : Gstpipeline0:
> /pipeline/gstwavparse : wavparse0
> streaming task paused, reason not linked (-1)
> ERROR : pipeline does not preroll
> setting pipeline to null
>
>
> if i change my plugin rate is 16000, then it is working fine,
> what is problem, can anybody explain please.
>
> Advance Thanks
> rajashekar
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/wavparser-not-negotiate-with-my-plugin-tp4583694p4583694.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 24 Apr 2012 21:42:39 +0530
> From: Sree Gowri <sreegowris at gmail.com>
> Subject: Re: Audio Metadata
> To: gstreamer-devel at lists.freedesktop.org
> Message-ID:
> <CAHHUHfGyoJb8m7PAyBbxVjTH+F6FF+jbS8pvvZKU_2dcuNVS4Q at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Tue, Apr 24, 2012 at 5:46 PM, Stefan Sauer <ensonic at hora-obscura.de>wrote:
>
> > **
> > On 04/24/2012 11:18 AM, Sree Gowri wrote:
> >
> >
> >
> > On Mon, Apr 16, 2012 at 12:53 AM, Stefan Sauer <ensonic at hora-obscura.de>wrote:
> >
> >> On 04/12/2012 06:23 AM, Sree Gowri wrote:
> >>
> >> Hi,
> >>
> >> I am trying to extract audio metadata like
> >> streamurl,streamtitle,artist,genre,album.However I am not able to extract
> >> the metadata using GstTagList. Below is the snippet of the code. Does
> >> anyone suggest what are the additions to be done in order to extract the
> >> metadata?
> >>
> >> Only the following data has been extracted.
> >> layer: 3
> >> mode: joint
> >> emphasis: none
> >> audio codec: MPEG-1 layer 3
> >> bitrate: 128000
> >>
> >> Pipeline is as follows:
> >>
> >> [code]
> >> app->pipeline= gst_parse_launch("appsrc name=mysource ! audio/mpeg ! mad
> >> ! alsasink", NULL);
> >> [/code]
> >>
> >> "appsrc name=mysource ! audio/mpeg ! mp3parse ! mad ! alsasink"
> >> or even better
> >> "appsrc name=mysource ! audio/mpeg ! decodebin2 ! alsasink"
> >>
> >> Stefan
> >>
> >>
> >> Audio data fed to the appsrc element
> >>
> >> [code]
> >> buf =( GstBuffer *) gst_app_buffer_new (data, READBUF, g_free, data);
> >> g_signal_emit_by_name (GST_APP_SRC (app->appsrc), "push-buffer", buf,
> >> &ret);
> >> [/code]
> >>
> >> Bus message
> >>
> >> [code]
> >> case GST_MESSAGE_TAG:
> >> {
> >> GstTagList *tags = NULL;
> >> char *artist;
> >> gst_message_parse_tag (message, &tags);
> >> g_print ("Got tags from element %s:\n", GST_OBJECT_NAME
> >> (message->src));
> >> if (gst_tag_list_get_string (tags, GST_TAG_ARTIST, &artist))
> >> {
> >> printf("got artist: %s\n",artist);
> >> }
> >> else
> >> {
> >> printf("no artist!! \n");
> >> }
> >> gst_tag_list_foreach (tags, print_tag, NULL);
> >> g_print ("\n");
> >> gst_tag_list_free (tags);
> >> break;
> >> [/code]
> >>
> >> print_tag function code
> >> [code]
> >> static void print_tag (const GstTagList * list, const gchar * tag,
> >> gpointer unused)
> >> {
> >> gint i, count;
> >> count = gst_tag_list_get_tag_size (list, tag);
> >> for (i = 0; i < count; i++) {
> >> gchar *str;
> >> if (gst_tag_get_type (tag) == G_TYPE_STRING) {
> >> if (!gst_tag_list_get_string_index (list, tag, i, &str))
> >> g_assert_not_reached ();
> >>
> >> } else {
> >> str =
> >> g_strdup_value_contents (gst_tag_list_get_value_index (list,
> >> tag, i));
> >> }
> >> if (i == 0) {
> >> g_print (" %15s: %s\n", gst_tag_get_nick (tag), str);
> >> } else {
> >> g_print (" : %s\n", str);
> >> }
> >> g_free (str);
> >> }
> >> }
> >> [/code]
> >>
> >> Thanks and Regards,
> >> Sree Gowri
> >>
> >> Hi stephan,
> >
> > First would like to thank you for the input you provided.
> >
> > I tried both the pipelines that you have mentioned,however meta data
> > has not been extracted.
> >
> > Kindly request you to let me know if there are any other changes that
> > needs to be done.
> >
> >
> > Are you sure the stream you are looking at is tagged with such metadata?
> > Try gst-launch-0.10 -t playbin2 uri=...
> >
> > Stefan
> >
>
> Yes the stream contains the metadata like streamTitle, streamUrl. In
> order to check does the stream really has metadata, appsrc buffer is
> written to a file and checked using hexedit and I can find the
> metadata.Sure will try your suggestion tomorrow and update you. Thankyou.
>
> >
> >
> >
> > Regards,
> > Sree Gowri
> >
> >
> >>
> >> _______________________________________________
> >> gstreamer-devel mailing listgstreamer-devel at lists.freedesktop.orghttp://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >>
> >>
> >>
> >> _______________________________________________
> >> gstreamer-devel mailing list
> >> gstreamer-devel at lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >>
> >>
> >
> > _______________________________________________
> > gstreamer-devel mailing listgstreamer-devel at lists.freedesktop.orghttp://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
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> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
> End of gstreamer-devel Digest, Vol 15, Issue 56
> ***********************************************
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