[gst-devel] Converting pipeline to C
Gabriel Duarte
confusosk8 at gmail.com
Wed Oct 28 18:20:03 CET 2009
Thank you! Is working now!!!
On Wed, Oct 28, 2009 at 6:54 AM, Stefan Kost <ensonic at hora-obscura.de>wrote:
> hi,
>
> This is wrong
> gst_element_link_many (source, demuxer, decoder, sink, NULL);
> do
> gst_element_link(source, demuxer);
> gst_element_link(decoder, sink);
> you will link demuxer to decoder in the on_pad_added() callback.
>
> Stefan
>
>
> >
> > On Wed, Oct 28, 2009 at 12:12 AM, Gabriel Duarte <confusosk8 at gmail.com
> > <mailto:confusosk8 at gmail.com>> wrote:
> >
> > sorry, I sent the wrong code, this is the right:
> >
> > #include <gst/gst.h>
> > #include <glib.h>
> >
> >
> > static gboolean
> > cb_print_position (GstElement *pipeline)
> > {
> > GstFormat fmt = GST_FORMAT_TIME;
> > gint64 pos, len;
> >
> > if (gst_element_query_position (pipeline, &fmt, &pos)
> > && gst_element_query_duration (pipeline, &fmt, &len)) {
> > g_print ("Time: %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT "\r",
> > GST_TIME_ARGS (pos), GST_TIME_ARGS (len));
> > }
> >
> > /* call me again */
> > return TRUE;
> > }
> >
> >
> >
> > static gboolean
> > bus_call (GstBus *bus,
> > GstMessage *msg,
> > gpointer data)
> > {
> > GMainLoop *loop = (GMainLoop *) data;
> >
> > switch (GST_MESSAGE_TYPE (msg)) {
> >
> > case GST_MESSAGE_EOS:
> > g_print ("End of stream\n");
> > g_main_loop_quit (loop);
> > break;
> >
> > case GST_MESSAGE_ERROR: {
> > gchar *debug;
> > GError *error;
> >
> > gst_message_parse_error (msg, &error, &debug);
> > g_free (debug);
> >
> > g_printerr ("Error: %s\n", error->message);
> > g_error_free (error);
> >
> > g_main_loop_quit (loop);
> > break;
> > }
> > default:
> > break;
> > }
> >
> > return TRUE;
> > }
> >
> >
> > static void
> > on_pad_added (GstElement *element,
> > GstPad *pad,
> > gpointer data)
> > {
> > GstPad *sinkpad;
> > GstElement *decoder = (GstElement *) data;
> >
> > /* We can now link this pad with the vorbis-decoder sink pad */
> > g_print ("Dynamic pad created, linking demuxer/decoder\n");
> >
> > sinkpad = gst_element_get_static_pad (decoder, "sink");
> >
> > gst_pad_link (pad, sinkpad);
> >
> > gst_object_unref (sinkpad);
> > }
> >
> >
> >
> > int
> > main (int argc,
> > char *argv[])
> > {
> > GMainLoop *loop;
> >
> > GstElement *pipeline, *source, *demuxer, *decoder, *sink;
> > GstBus *bus;
> >
> > /* Initialisation */
> > gst_init (&argc, &argv);
> >
> > loop = g_main_loop_new (NULL, FALSE);
> >
> >
> > /* Check input arguments */
> > /* if (argc != 2) {
> > g_printerr ("Usage: %s <Ogg/Vorbis filename>\n", argv[0]);
> > return -1;
> > }*/
> >
> > /*gst-launch-0.10 dv1394src num-buffers=8192 ! dvdemux ! dvdec !
> > xvimagesink sync=false*/
> > /* Create gstreamer elements */
> > pipeline = gst_pipeline_new ("DV_FIREWIRE");
> > source = gst_element_factory_make ("dv1394src",
> > "dv1394src");
> > demuxer = gst_element_factory_make ("dvdemux", "dvdemux");
> > decoder = gst_element_factory_make ("dvdec", "dvdec");
> > sink = gst_element_factory_make ("ximagesink", "ximagesink");
> >
> > if (!pipeline || !source || !demuxer || !decoder || !sink) {
> > g_printerr ("One element could not be created. Exiting.\n");
> > return -1;
> > }
> >
> > /* Set up the pipeline */
> >
> > /* we set the input filename to the source element */
> > /*g_object_set (G_OBJECT (sink), "sync", FALSE, NULL);*/
> >
> > /* we add a message handler */
> > bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
> > gst_bus_add_watch (bus, bus_call, loop);
> > gst_object_unref (bus);
> >
> > /* we add all elements into the pipeline */
> > /* file-source | ogg-demuxer | vorbis-decoder | converter |
> > alsa-output */
> > gst_bin_add_many (GST_BIN (pipeline), source, demuxer, decoder,
> > sink, NULL);
> >
> > /* we link the elements together */
> > /* file-source -> ogg-demuxer ~> vorbis-decoder -> converter ->
> > alsa-output */
> > /* gst_element_link (source, demuxer);*/
> > gst_element_link_many (source, demuxer, decoder, sink, NULL);
> > g_signal_connect (demuxer, "pad-added", G_CALLBACK
> > (on_pad_added), decoder);
> >
> > /* note that the demuxer will be linked to the decoder dynamically.
> > The reason is that Ogg may contain various streams (for example
> > audio and video). The source pad(s) will be created at run time,
> > by the demuxer when it detects the amount and nature of streams.
> > Therefore we connect a callback function which will be executed
> > when the "pad-added" is emitted.*/
> >
> >
> > /* Set the pipeline to "playing" state*/
> > g_print ("Now playing: %s\n", argv[1]);
> > gst_element_set_state (pipeline, GST_STATE_PLAYING);
> >
> >
> > /* Iterate */
> > g_print ("Running...\n");
> > g_timeout_add (200, (GSourceFunc) cb_print_position, pipeline);
> > g_main_loop_run (loop);
> >
> >
> > /* Out of the main loop, clean up nicely */
> > g_print ("Returned, stopping playback\n");
> > gst_element_set_state (pipeline, GST_STATE_NULL);
> >
> > g_print ("Deleting pipeline\n");
> > gst_object_unref (GST_OBJECT (pipeline));
> > printf("THE END\n");
> > return 0;
> > }
> >
> >
> > On Tue, Oct 27, 2009 at 8:24 PM, Gabriel Duarte
> > <confusosk8 at gmail.com <mailto:confusosk8 at gmail.com>> wrote:
> >
> > hello all, I'm trying to convert this pipeline to C, but I'm
> > having problems....
> >
> >
> > gst-launch-0.10 dv1394src num-buffers=8192 ! dvdemux ! dvdec !
> > xvimagesink sync=false
> >
> >
> > I've wrote this code:
> >
> >
> > #include <string.h> /* for memset () */
> > #include <gst/gst.h>
> >
> > static void
> > cb_handoff (GstElement *fakesrc,
> > GstBuffer *buffer,
> > GstPad *pad,
> > gpointer user_data)
> > {
> > static gboolean white = FALSE;
> >
> > /* this makes the image black/white */
> > memset (GST_BUFFER_DATA (buffer), white ? 0xff : 0x0,
> > GST_BUFFER_SIZE (buffer));
> > white = !white;
> > }
> >
> > gint
> > main (gint argc,
> > gchar *argv[])
> > {
> > GstElement *pipeline, *fakesrc, *flt, *conv, *videosink;
> > GMainLoop *loop;
> >
> > /* init GStreamer */
> > gst_init (&argc, &argv);
> > loop = g_main_loop_new (NULL, FALSE);
> >
> > /* setup pipeline */
> > pipeline = gst_pipeline_new ("pipeline");
> > fakesrc = gst_element_factory_make ("fakesrc", "source");
> > flt = gst_element_factory_make ("capsfilter", "flt");
> > conv = gst_element_factory_make ("ffmpegcolorspace", "conv");
> > videosink = gst_element_factory_make ("xvimagesink",
> "videosink");
> >
> > /* setup */
> > g_object_set (G_OBJECT (flt), "caps",
> > gst_caps_new_simple ("video/x-raw-rgb",
> > "width", G_TYPE_INT, 384,
> > "height", G_TYPE_INT, 288,
> > "framerate",
> GST_TYPE_FRACTION, 1, 1,
> > "bpp", G_TYPE_INT, 16,
> > "depth", G_TYPE_INT, 16,
> > "endianness", G_TYPE_INT,
> G_BYTE_ORDER,
> > NULL), NULL);
> > gst_bin_add_many (GST_BIN (pipeline), fakesrc, flt, conv,
> videosink, NULL);
> > gst_element_link_many (fakesrc, flt, conv, videosink, NULL);
> >
> > /* setup fake source */
> > g_object_set (G_OBJECT (fakesrc),
> > "signal-handoffs", TRUE,
> > "sizemax", 384 * 288 * 2,
> > "sizetype", 2, NULL);
> > g_signal_connect (fakesrc, "handoff", G_CALLBACK (cb_handoff),
> NULL);
> >
> > /* play */
> > gst_element_set_state (pipeline, GST_STATE_PLAYING);
> > g_main_loop_run (loop);
> >
> > /* clean up */
> > gst_element_set_state (pipeline, GST_STATE_NULL);
> > gst_object_unref (GST_OBJECT (pipeline));
> >
> > return 0;
> > }
> >
> >
> >
> >
> >
> > Any ideas???
> >
> > Best regards :D
> >
> >
> >
> >
> >
> >
> > --
> > Gabriel Duarte
> > Linux User #471185
> > Rio de Janeiro - RJ
> > http://kinuxlinux.org/gabriel_duarte
> >
> > Phones:
> > (55) (21) 9463-7760 /*Mobile*/
> > (55) (21) 2464-9302 /*Home*/
> > (55) (21) 2529-5080 /*Work*/
> >
> >
> > -----BEGIN GEEK CODE BLOCK-----
> > Version: 3.12
> > GCS d- s: a--- C++ UL+++ P L++++ E- W+ N++ o++ K++ w---
> > O- M- V- PS++ PE++ Y PGP- t++ 5-- X+++ R tv++ b++ DI+ D++
> > G++ e+ h* r+ y++++
> > ------END GEEK CODE BLOCK------
> >
> >
> >
> >
> > --
> > Gabriel Duarte
> > Linux User #471185
> > Rio de Janeiro - RJ
> > http://kinuxlinux.org/gabriel_duarte
> >
> > Phones:
> > (55) (21) 9463-7760 /*Mobile*/
> > (55) (21) 2464-9302 /*Home*/
> > (55) (21) 2529-5080 /*Work*/
> >
> >
>
>
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
--
Gabriel Duarte
Linux User #471185
Rio de Janeiro - RJ
http://kinuxlinux.org/gabriel_duarte
Phones:
(55) (21) 9463-7760 /*Mobile*/
(55) (21) 2464-9302 /*Home*/
(55) (21) 2529-5080 /*Work*/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d- s: a--- C++ UL+++ P L++++ E- W+ N++ o++ K++ w---
O- M- V- PS++ PE++ Y PGP- t++ 5-- X+++ R tv++ b++ DI+ D++
G++ e+ h* r+ y++++
------END GEEK CODE BLOCK------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20091028/1ab10298/attachment.htm>
More information about the gstreamer-devel
mailing list