Convert pipeline to C code to play .mov video

[tnewman]

HI,

I know that what I have pasted below is not exactly what you are looking for
but it should fill in some blanks.  The below code snippets should create
play back pipeline (albeit using a avidemux) and calling the relevant
dynamic pad callback for the video and audio request pads.

Hope this helps.


void dynamic_addpad(GstElement *element, GstPad *pad, gpointer data)
{
    char* pad_name = gst_pad_get_name(pad);
    g_print(" In dynamic ADDING PAD %s\n", pad_name);

    if (g_str_has_prefix(pad_name,"audio"))
    {
        GstPad *audiodemuxsink =
gst_element_get_static_pad(g_gst_PlaybackPipeline.audioqueue, "sink");
        gst_pad_link(pad, audiodemuxsink );
    }
    else if (g_str_has_prefix(pad_name,"video"))
    {
        GstPad *videodemuxsink =
gst_element_get_static_pad(g_gst_PlaybackPipeline.videoqueue, "sink");
        gst_pad_link(pad, videodemuxsink );
    }

    g_free (pad_name);
}



void gst_VideoPlayback(void)
{
    GstCaps *videoCaps_rgb = gst_caps_new_simple (
        "video/x-raw-rgb",
        NULL);

    /* Create gstreamer elements */
    g_gst_PlaybackPipeline.pipeline  = gst_pipeline_new ("pipeline");

    g_gst_PlaybackPipeline.source          = gst_element_factory_make
("filesrc", "source");
    g_gst_PlaybackPipeline.demux           = gst_element_factory_make
("avidemux", "demux");
    g_gst_PlaybackPipeline.audioqueue      = gst_element_factory_make
("queue", "qzero");
    g_gst_PlaybackPipeline.audio_sink      = gst_element_factory_make
("alsasink", "audioSink");
    g_gst_PlaybackPipeline.videoqueue      = gst_element_factory_make
("queue", "qone");
    g_gst_PlaybackPipeline.jpegdecode      = gst_element_factory_make
("jpegdec", "jpegdecode"); //jpegdec
    g_gst_PlaybackPipeline.colorspaceconv  = gst_element_factory_make
("ffmpegcolorspace", "rgb-colorconv");
#ifndef APP_SINK
    g_gst_PlaybackPipeline.video_sink      = gst_element_factory_make
("fakesink", "videosink");
#else
    g_gst_PlaybackPipeline.video_sink      = gst_element_factory_make
("appsink", "videosink");
#endif

    if (!g_gst_PlaybackPipeline.pipeline   || !g_gst_PlaybackPipeline.source        
||  !g_gst_PlaybackPipeline.demux      ||
        !g_gst_PlaybackPipeline.audioqueue ||
!g_gst_PlaybackPipeline.audio_sink     || 
!g_gst_PlaybackPipeline.videoqueue ||
        !g_gst_PlaybackPipeline.jpegdecode ||
!g_gst_PlaybackPipeline.colorspaceconv || 
!g_gst_PlaybackPipeline.video_sink
       )
    {
        g_printerr ("One element could not be created. Exiting.\n");
        return;
    }

    /* Set element objects */
    g_object_set (G_OBJECT (g_gst_PlaybackPipeline.video_sink), "sync",
FALSE, NULL);
    g_object_set (G_OBJECT (g_gst_PlaybackPipeline.audio_sink), "sync",
FALSE, NULL);
    g_object_set (G_OBJECT (g_gst_PlaybackPipeline.audioqueue),
"max-size-buffers", 0, NULL);
    g_object_set (G_OBJECT (g_gst_PlaybackPipeline.videoqueue),
"max-size-buffers", 0, NULL);

    g_signal_connect(g_gst_PlaybackPipeline.demux, "pad-added",
G_CALLBACK(dynamic_addpad),NULL);

#ifndef APP_SINK
    /* add some signals for call back funtions */
    g_signal_connect (g_gst_PlaybackPipeline.video_sink, "handoff",
fileplayback_on_handoff, NULL);
#else
    /* Configure appsink */
    g_object_set (g_gst_PlaybackPipeline.video_sink, "emit-signals", TRUE,
NULL);
    g_signal_connect (g_gst_PlaybackPipeline.video_sink, "new-buffer",
G_CALLBACK (fileplayback_new_buffer), &g_gst_PlaybackPipeline);
#endif

    /* we add a message handler */
    g_VideoPlayback_bus = gst_pipeline_get_bus (GST_PIPELINE
(g_gst_PlaybackPipeline.pipeline));
    gst_bus_add_watch (g_VideoPlayback_bus, VideoPlayback_bus_call,
g_VideoPlayback_loop);
    gst_object_unref (g_VideoPlayback_bus);

    /* we add all elements into the pipeline */
    gst_bin_add_many (GST_BIN (g_gst_PlaybackPipeline.pipeline),
g_gst_PlaybackPipeline.source, g_gst_PlaybackPipeline.demux,
                      g_gst_PlaybackPipeline.audioqueue,
g_gst_PlaybackPipeline.audio_sink, g_gst_PlaybackPipeline.videoqueue,
                      g_gst_PlaybackPipeline.jpegdecode,
g_gst_PlaybackPipeline.colorspaceconv, g_gst_PlaybackPipeline.video_sink,
NULL);

    /* we add filters into the pipeline */
    gst_element_link_filtered(g_gst_PlaybackPipeline.colorspaceconv,
g_gst_PlaybackPipeline.video_sink, videoCaps_rgb);
    gst_caps_unref(videoCaps_rgb);

    /* we link the elements together */
    gst_element_link_many (g_gst_PlaybackPipeline.source,
g_gst_PlaybackPipeline.demux, NULL);
    gst_element_link_many (g_gst_PlaybackPipeline.audioqueue,
g_gst_PlaybackPipeline.audio_sink, NULL);
    gst_element_link_many (g_gst_PlaybackPipeline.videoqueue,
g_gst_PlaybackPipeline.jpegdecode, g_gst_PlaybackPipeline.colorspaceconv,
g_gst_PlaybackPipeline.video_sink, NULL);

    /* Set the pipeline to "playing" state*/
    g_print ("Video Playback Pipeline: [CREATED][NULL]\n");
    gst_element_set_state (g_gst_PlaybackPipeline.pipeline, GST_STATE_NULL);
    g_GstreamerVideoPlaybackPipelineState = eGSTStateNull;
}




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