[gst-devel] gstreamer appliaction
Kapil Agrawal
kapil.agl at gmail.com
Thu Nov 26 17:22:28 CET 2009
you should be adding respective queue before the audio and video decoder
(essentially after the demuxer), and in the on_pad_added connect to the
sinkpad of those queue.
On Thu, Nov 26, 2009 at 9:19 PM, Sedji Gaouaou <sedji.gaouaou at atmel.com>wrote:
> Hi all,
>
> I am a newbe with gstreamer, and I am currently writting a application
> which will play a .avi file.
> But I have a problem when trying to play both audio and video.
>
> Here is my application:
> In the main, if I comment the audio(gst_bin_add_many and
> gst_element_link_many) then the video works fine. Same thing appends if
> I comment the video part then the audio play just fine, but when trying
> both the video doesn't even start??
>
> Am I missing something?
>
> Regards,
> Sedji
>
>
> #include <gst/gst.h>
> #include <glib.h>
> #include <string.h>
>
>
> static GstElement *source, *demuxer, *vdqueue, *adqueue, *vdsink,
> *adsink, *decvd, *decad;
>
> 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);
>
> 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");
> 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");
> g_assert (targetsink != NULL);
> gst_pad_link (pad, targetsink);
> gst_object_unref (targetsink);
> }
>
> gst_caps_unref (caps);
> }
>
> 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;
> }
>
> 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 != 2) {
> g_printerr ("Usage: %s <Video H264 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 ("x170",
> "video-decoder");
> decad = gst_element_factory_make ("mad", "mp3-decoder");
> vdsink = gst_element_factory_make ("ximagesink",
> "video-sink");
> vdqueue = gst_element_factory_make ("multiqueue",
> "video-queue");
> adqueue = gst_element_factory_make ("multiqueue",
> "audio-queue");
> adsink = gst_element_factory_make ("osssink",
> "audio-sink");
>
> /* if needed to be set to MPEG4(value 4), default is AUTO */
> //g_object_set (decvd, "codec", 4, NULL);
> /* output format: RGB16 (i.e 2) */
> g_object_set (decvd, "output", 2, NULL);
> /* Scaling value */
> g_object_set (decvd, "scaling", 1.0, NULL);
> /* Threshold of the VDEC to sync audio and video */
> g_object_set (decvd, "inbuf-thresh", 100000, NULL);
>
> if (!pipeline || !source || !demuxer || !decvd || !vdsink ||
> !vdqueue
> || !decad || !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", argv[1], 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 | avi-demuxer | x170-decoder | ximagesink
> * | mad | audioconvert | osssink*/
>
> /* demux only */
> gst_bin_add_many (GST_BIN (pipeline),
> source, demuxer, NULL);
>
> /* video only */
> gst_bin_add_many (GST_BIN (pipeline),
> decvd, vdqueue, vdsink, NULL);
>
> /* audio only */
> gst_bin_add_many (GST_BIN (pipeline),
> decad, adqueue, adsink, NULL);
>
> /* we link the elements together */
> /* file-source -> demuxer ~> decoder -> image sink */
> gst_element_link (source, demuxer);
>
> if(!gst_element_link_many(decvd, vdqueue, vdsink, NULL)) {
> printf("problem linking video elements!!!!!\n");
> return FALSE;
> }
>
> if(!gst_element_link_many( decad, adqueue, adsink, NULL)) {
> printf("problem linking audio elements!!!!!\n");
> return FALSE;
> }
>
> gst_element_link_pads (demuxer, "video", vdqueue, "sink");
> gst_element_link_pads (demuxer, "audio", adqueue, "sink");
>
> g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
> NULL);
>
> /* 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_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));
>
> return 0;
> }
>
>
>
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--
http://www.linkedin.com/in/kapilagrawal
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