translating command to code for playing an avi

[Víctor M. Jáquez L.]

On Tue, Jan 03, 2012 at 04:21:32AM -0200, Rossana Guerra wrote:
> Hi, I try to play an avi, I know there's playbin2 option, but I want to
> gain more control and understand some issues as well.
> 
> I can play an avi from console with this command.
> gst-launch filesrc location=/home/rossana/video11.avi ! avidemux
> name=demux  demux.audio_00 ! decodebin ! queue ! audioconvert !
> audioresample ! autoaudiosink   demux.video_00 ! decodebin ! queue !
> ffmpegcolorspace ! videoscale ! autovideosink"
> 
> I tempted to translate into C/C++ code, but I got errors "caps incompatible"

I guess you could use gst_parse_lunch

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstParse.html#gst-parse-launch

vmjl

> 
> Thanks
> 
> Rossana
> 
> 
> void on_pad_added (GstElement *element, GstPad *pad, GstElement *data)
> {
>         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);
> 
>         cout << "enlazando enlazara pads" << endl << endl;
>         if (g_strrstr (gst_structure_get_name (str), "video")) {
>                 g_debug ("Linking video pad to dec_vd");
>                 // Link it actually
>                 //GstPad *targetsink = gst_element_get_pad (decvd, "sink");
>                 GstPad *targetsink = gst_element_get_pad (data, "sink");
>                 cout << "enlazando cola de video" << endl << endl;
>                 g_assert (targetsink != NULL);
>                 gst_pad_link (pad, targetsink);
>                 gst_object_unref (targetsink);
>         }
> 
>         if (g_strrstr (gst_structure_get_name (str), "audio")) {
>                 g_debug ("Linking audio pad to dec_ad");
>                 // Link it actually
>                 //GstPad *targetsink = gst_element_get_pad (decad, "sink");
>                 GstPad *targetsink = gst_element_get_pad (data, "sink");
>                 cout << "enlazando cola de audio" << endl << endl;
>                 g_assert (targetsink != NULL);
>                 gst_pad_link (pad, targetsink);
>                 gst_object_unref (targetsink);
>         }
> 
>         gst_caps_unref (caps);
> }
> 
> 
> 
> int main (int   argc, char *argv[])
> {
>   GMainLoop *loop;
> 
>   GstElement *pipeline;
>   GstBus *bus;
> 
>   /* Initialisation */
>   gst_init (&argc, &argv);
> 
>   loop = g_main_loop_new (NULL, FALSE);
> 
> 
>   /* Check input arguments */
>   if (argc != 1) {
>     g_printerr ("Usage: %s <AVI filename>\n", argv[0]);
>     return -1;
>   }
> 
>   /* Create gstreamer elements */
>   pipeline = gst_pipeline_new ("media-player");
>   source = gst_element_factory_make ("filesrc", "file-source");
>   demuxer = gst_element_factory_make ("avidemux", "avi-demuxer");
>   decvd = gst_element_factory_make ("decodebin2", "decvd");
>   decad = gst_element_factory_make ("decodebin2", "decad");
>   aconvert = gst_element_factory_make ("audioconvert", "aconvert");
>   asample = gst_element_factory_make ("audioresample", "asample");
>   vdsink = gst_element_factory_make ("autovideosink", "video-sink");
>   vdqueue = gst_element_factory_make ("queue", "video-queue");
>   adqueue = gst_element_factory_make ("queue", "audio-queue");
>   adsink = gst_element_factory_make ("autoaudiosink", "audio-sink");
>   color = gst_element_factory_make("ffmpegcolorspace","color");
>   vscale = gst_element_factory_make("videoscale","vscale");
> 
>   if (!pipeline || !source || !demuxer || !decvd || !decad || !vdsink ||
> !vdqueue || !adqueue || !adsink) {
>     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 (source), "location", "/home/videos/video11.avi",
> 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 */
>   //GstElement *clk = gst_element_factory_make("clockoverlay","clk");
> 
> 
>   gst_bin_add_many (GST_BIN (pipeline),source, demuxer, decvd, decad,
> aconvert, vscale,asample,color,adqueue, vdqueue, vdsink, adsink,  NULL);
> 
> 
>   /* we link the elements together */
>   /* file-source -> demuxer ~> {video-decoder -> video-output} ~>
> {audio-decoder -> alsa-output} */
>   gst_element_link (source, demuxer);
> 
> 
>   GstPad *targetsrc = gst_element_get_pad(demuxer, "video_%02");
> 
>   GstPad *targetsrc2 = gst_element_get_pad(demuxer, "audio_%02");
> 
> 
>   GstPad *padV = gst_element_get_static_pad(decvd,"sink");
>   GstPad *padA = gst_element_get_static_pad(decad,"sink");
> 
> 
>   gst_pad_link (targetsrc,padV);
>   gst_object_unref (targetsrc);
> 
> 
>   g_signal_connect (decvd, "pad-added", G_CALLBACK (on_pad_added), vdqueue);
>   cout << "decvd - vdqueue" << endl << endl;
>   gst_element_link (vdqueue,color);
>   gst_element_link (color,vscale);
>   gst_element_link (vscale,vdsink);
> 
>   gst_pad_link (targetsrc2,padA);
>   gst_object_unref (targetsrc2);
>   g_signal_connect (decad, "pad-added", G_CALLBACK (on_pad_added), adqueue);
>   cout << "decad - adqueue" << endl << endl;
>   gst_element_link (adqueue, aconvert);
>   gst_element_link (aconvert, asample);
>   gst_element_link (asample, adsink);
> 
> 
> 
>   /* Set the pipeline to "playing" state*/
>   g_print ("Playing: %s\n", argv[1]);
>   gst_element_set_state (pipeline, GST_STATE_PLAYING);
> 
>   GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(pipeline),
> GST_DEBUG_GRAPH_SHOW_ALL,"playerdec1");
> 
> 
>   g_main_loop_run (loop);
> 
> 
>   /* Out of the main loop, clean up nicely */
>   gst_element_set_state (pipeline, GST_STATE_NULL);
>   gst_object_unref (GST_OBJECT (pipeline));
>   //g_print ("Deleting pipeline\n");
> 
> 
>   return 0;
> }

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