[gst-devel] play audio and video simultaneously
sledge hammer
sledgehammer_999 at hotmail.com
Mon Apr 27 19:25:12 CEST 2009
I am fine. No problem. You may find a better explanation of the problem in this wiki entry: http://gstreamer.freedesktop.org/wiki/FAQ#head-9f14f8ce765b3d24c91660db5f02e3345da98a35
> Date: Fri, 24 Apr 2009 07:22:53 -0700
> From: alavariega at dextratech.com
> To: gstreamer-devel at lists.sourceforge.net
> Subject: Re: [gst-devel] play audio and video simultaneously
>
>
> Hi how are you?
>
> Thanks a lot for your help, the problem was solved with your comments below.
>
> Have a nice day and again thanks for your help and time for reply to my
> mails
>
> Best Regards,
>
> Alberto
>
>
> sledge hammer wrote:
> >
> >
> > I think your problem is this:
> >
> > The queues should be between the demuxer and the decoder. I see that you
> > put them between the decoder and the audioconvert(for the audio stream).
> > The pipeline linkage should look like
> > src->demuxer->queuea->decodera->convert->resample->sinka
> > src->demuxer->queuev->decoderv->sinkv
> >
> >> Date: Thu, 23 Apr 2009 08:31:41 -0700
> >> From: alavariega at dextratech.com
> >> To: gstreamer-devel at lists.sourceforge.net
> >> Subject: Re: [gst-devel] play audio and video simultaneously
> >>
> >>
> >> The "mad" element doesn't have dynamic pads, so it doesn't emit a
> >> "pad-added"
> >> signal. You can connect it directly to "audioconvert".
> >>
> >> Also I see that you declare "queueV" as a "GstElement**" and not as a
> >> "GstElement*".
> >>
> >>
> >> Hi Sledge, thanks for your reply!
> >>
> >> I have already made the corresponding changes and still not activated the
> >> signal that link the video decoder with the respective queue. when i
> >> execute
> >> the application this is the result:
> >>
> >> ** (testvideop:6043): DEBUG: Signal: pad-added
> >> on_pad_added: audio/mpeg
> >> ** (testvideop:6043): DEBUG: Linking audio pad to decodera
> >> The audio pad src was linked
> >> ** (testvideop:6043): DEBUG: Signal: pad-added
> >> on_pad_added: video/mpeg
> >> ** (testvideop:6043): DEBUG: Linking video pad to decoderv
> >> The video pad src was linked
> >>
> >> There are no more errors, but they are not playing the video and audio
> >> streams simultaneously
> >>
> >> Thanks in advance for the help,
> >>
> >> Best Regards,
> >>
> >> Alberto.
> >>
> >>
> >>
> >> #include<gst/gst.h>
> >>
> >> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer
> >> data);
> >> static void on_pad_added (GstElement *element, GstPad *pad);
> >> static void on_decpad_added(GstElement *element, GstPad *pad );
> >>
> >> GstElement *pipeline, *src, *demux, *decoderv, *sinkv, *decodera,
> >> *convert,
> >> *resample, *sinka;
> >> GstElement *queueA, *queueV;
> >>
> >> int main(int argc, char *argv[])
> >> {
> >> GstStateChangeReturn ret;
> >> GMainLoop *loop;
> >> GstBus *bus;
> >> /*initialization*/
> >> gst_init(&argc,&argv);
> >> loop = g_main_loop_new(NULL, FALSE);
> >>
> >> if(argc != 2)
> >> {
> >> g_print("Usage: %s <mpg/mpeg video file>", argv[0]);
> >> return -1;
> >> }
> >>
> >> pipeline = gst_pipeline_new("VIDEO PLAYER");
> >> bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
> >> gst_bus_add_watch(bus, bus_call, loop);
> >>
> >> src = gst_element_factory_make("filesrc", "filesource");
> >> demux = gst_element_factory_make("dvddemux", "mpg-demux");
> >>
> >> /*Gstreamer video elements*/
> >> decoderv = gst_element_factory_make("mpeg2dec", "mpeg-decoder");
> >> sinkv = gst_element_factory_make("xvimagesink", "video-out");
> >> if(!decoderv || !sinkv)
> >> {
> >> g_print("\nthe video could not playback\n");
> >> return -1;
> >> }
> >>
> >> /*Gstreamer audio elements*/
> >>
> >> decodera = gst_element_factory_make("mad", "decoder-audio");
> >> convert = gst_element_factory_make("audioconvert", "a-convert");
> >> resample = gst_element_factory_make("audioresample", "a-resample");
> >> sinka = gst_element_factory_make("osssink", "play audio");
> >> if(!decodera || !convert || !resample || !sinka)
> >> {
> >> g_print("\nthe audio could not playback\n");
> >> return -1;
> >> }
> >>
> >> queueA = gst_element_factory_make("queue", "queue-audio");
> >> queueV = gst_element_factory_make("queue", "queue-video");
> >>
> >> g_object_set (G_OBJECT (src), "location", argv[1], NULL);
> >> gst_bin_add_many(GST_BIN(pipeline), src, demux, decoderv,
> >> queueV,sinkv,decodera,convert, resample, sinka, NULL);
> >>
> >> gst_element_link (src, demux);
> >> gst_element_link (queueV, sinkv);
> >> // gst_element_link (queueA, convert);
> >> gst_element_link (decodera, convert);
> >> gst_element_link (convert, resample);
> >> gst_element_link (resample, sinka);
> >>
> >> g_signal_connect (demux, "pad-added",G_CALLBACK (on_pad_added), NULL);
> >> //g_signal_connect (decodera,
> >> "pad-added",G_CALLBACK(on_decpad_added),decodera);
> >> g_signal_connect (decoderv,
> >> "pad-added",G_CALLBACK(on_decpad_added),decoderv);
> >>
> >> /* run */
> >> ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
> >>
> >> if (ret == GST_STATE_CHANGE_FAILURE)
> >> {
> >> GstMessage *msg;
> >>
> >> g_print ("Failed to start up pipeline!\n");
> >>
> >> /* check if there is an error message with details on the bus */
> >> msg = gst_bus_poll (bus, GST_MESSAGE_ERROR, 0);
> >> if (msg) {
> >> GError *err = NULL;
> >> g_print("\nDISPLAY ERROR:\n");
> >> gst_message_parse_error (msg, &err, NULL);
> >> g_print ("ERROR: %s\n", err->message);
> >> g_error_free (err);
> >> gst_message_unref (msg);
> >> }
> >> return -1;
> >> }
> >>
> >> g_main_loop_run (loop);
> >>
> >> /* clean up */
> >> gst_element_set_state (pipeline, GST_STATE_NULL);
> >> gst_object_unref (pipeline);
> >>
> >> return 0;
> >>
> >> }
> >>
> >>
> >> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer
> >> data)
> >> {
> >> GMainLoop *loop = 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 = NULL;
> >> GError *err = NULL;
> >>
> >> gst_message_parse_error (msg, &err, &debug);
> >>
> >> g_print ("Error: %s\n", err->message);
> >> g_error_free (err);
> >>
> >> if (debug) {
> >> g_print ("Debug details: %s\n", debug);
> >> g_free (debug);
> >> }
> >>
> >> g_main_loop_quit (loop);
> >> break;
> >> }
> >> default:
> >> break;
> >> }
> >>
> >> return TRUE;
> >> }
> >>
> >>
> >> static void on_decpad_added(GstElement *element, GstPad *pad )
> >> {
> >> g_debug ("Signal: decoder pad-added");
> >> GstCaps *caps;
> >> GstStructure *str;
> >> GstPad *targetsink;
> >> caps = gst_pad_get_caps (pad);
> >> g_assert (caps != NULL);
> >> str = gst_caps_get_structure (caps, 0);
> >> g_assert (str != NULL);
> >>
> >> g_debug ("Linking decoder to QUEUE pad ");
> >> // Link it actually
> >> //element = (element == decodera ? queueA : queueV);
> >> targetsink = gst_element_get_pad ( queueV, "sink");
> >> g_assert (targetsink != NULL);
> >> gst_pad_link (pad, targetsink);
> >> if (gst_pad_is_linked(pad))
> >> g_print("The decoder pad src was linked\n");
> >> else
> >> g_print("The stream:%s pad src was
> >> linked\n",gst_pad_get_name(pad));
> >> gst_object_unref (targetsink);
> >> gst_caps_unref (caps);
> >> }
> >>
> >> static void on_pad_added (GstElement *element, GstPad *pad)
> >> {
> >> g_debug ("Signal: pad-added");
> >> GstCaps *caps;
> >> GstStructure *str;
> >>
> >> caps = gst_pad_get_caps (pad);
> >> g_assert (caps != NULL);
> >> str = gst_caps_get_structure (caps, 0);
> >> g_assert (str != NULL);
> >>
> >> const gchar *c = gst_structure_get_name(str);
> >> g_print("on_pad_added: %s\n",c);
> >> if (g_strrstr (c, "video") || g_strrstr (c, "image")) {
> >> g_debug ("Linking video pad to decoderv");
> >> // Link it actually
> >> GstPad *targetsink = gst_element_get_pad (decoderv,
> >> "sink");
> >> g_assert (targetsink != NULL);
> >> //g_print("\nVIDEO--pad source: %s\n",
> >> gst_pad_get_name(pad));
> >> //g_print("\nVIDEO--pad sink: %s\n",
> >> gst_pad_get_name(targetsink));
> >> gst_pad_link (pad, targetsink);
> >> if (gst_pad_is_linked(pad))
> >> g_print("The video pad src was linked\n");
> >> gst_object_unref (targetsink);
> >> }
> >>
> >> if (g_strrstr (c, "audio")) {
> >> g_debug ("Linking audio pad to decodera");
> >> // Link it actually
> >> GstPad *targetsink = gst_element_get_pad (decodera,
> >> "sink");
> >> g_assert (targetsink != NULL);
> >> //g_print("\nAUDIO--pad source: %s\n",
> >> gst_pad_get_name(pad));
> >> //g_print("\nAUDIO--pad sink: %s\n",
> >> gst_pad_get_name(targetsink));
> >> gst_pad_link (pad, targetsink);
> >> if (gst_pad_is_linked(pad))
> >> g_print("The audio pad src was linked\n");
> >> gst_object_unref (targetsink);
> >> }
> >>
> >> gst_caps_unref (caps);
> >> }
> >>
> >>
> >>
> >>
> >> --
> >> View this message in context:
> >> http://www.nabble.com/play-audio-and-video-simultaneously-tp23175849p23197413.html
> >> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> >>
> >>
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> --
> View this message in context: http://www.nabble.com/play-audio-and-video-simultaneously-tp23175849p23217475.html
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