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# https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipeli - Pastebin.com
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- # https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c
- import gintro/[gst,gobject,glib]
- #[
- /* Structure to contain all our information, so we can pass it to callbacks */
- typedef struct _CustomData {
- GstElement *pipeline;
- GstElement *source;
- GstElement *convert;
- GstElement *resample;
- GstElement *sink;
- } CustomData;
- /* Handler for the pad-added signal */
- static void pad_added_handler (GstElement *src, GstPad *pad, CustomData *data);
- ]#
- proc main =
- #var pipeline: gst.Element
- var bus: gst.Bus
- var msg: gst.Message
- var ret: gst.StateChangeReturn
- #[
- CustomData data;
- gboolean terminate = FALSE;
- ]#
- # Initialize GStreamer
- gst.init() # gst_init (&argc, &argv);
- # Create the elements
- let source = make("uridecodebin", "source")
- let convert = make("audioconvert", "convert")
- let resample = make("audioresample", "resample")
- let sink = make("autoaudiosink", "sink")
- # Create the empty pipeline
- let pipeline = newPipeline("test-pipeline")
- assert( source != nil || convert != nil || resample || ! nil, "Not all elements could be created.")
- assert( sink != nil )
- assert( pipeline != nil )
- # Build the pipeline.
- ret = pipeline.add(source)
- ret = pipeline.add(convert)
- ret = pipeline.add(resample)
- ret = pipeline.add(sink)
- # Note that we are NOT linking the source at this
- # point. We will do it later.
- ret = convert.link(resample)
- ret = resample.link(link)
- assert( ret != nil, "Elements could not be linked." )
- # Set the URI to play
- # g_object_set (data.source, "uri", "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm", NULL);
- setProperty(source, "uri", "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm")
- # Connect to the pad-added signal
- # g_signal_connect (data.source, "pad-added", G_CALLBACK (pad_added_handler), &data);
- # Start playing
- let stateChange = pipeline.setState(playing)
- assert(stateChange != nil, "Unable to set the pipeline to the playing state")
- # Listen to the bus
- #[
- /* */
- bus = gst_element_get_bus (data.pipeline);
- do {
- msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
- GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
- /* Parse message */
- if (msg != NULL) {
- GError *err;
- gchar *debug_info;
- switch (GST_MESSAGE_TYPE (msg)) {
- case GST_MESSAGE_ERROR:
- gst_message_parse_error (msg, &err, &debug_info);
- g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
- g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
- g_clear_error (&err);
- g_free (debug_info);
- terminate = TRUE;
- break;
- case GST_MESSAGE_EOS:
- g_print ("End-Of-Stream reached.\n");
- terminate = TRUE;
- break;
- case GST_MESSAGE_STATE_CHANGED:
- /* We are only interested in state-changed messages from the pipeline */
- if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data.pipeline)) {
- GstState old_state, new_state, pending_state;
- gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
- g_print ("Pipeline state changed from %s to %s:\n",
- gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
- }
- break;
- default:
- /* We should not reach here */
- g_printerr ("Unexpected message received.\n");
- break;
- }
- gst_message_unref (msg);
- }
- } while (!terminate);
- /* Free resources */
- gst_object_unref (bus);
- gst_element_set_state (data.pipeline, GST_STATE_NULL);
- gst_object_unref (data.pipeline);
- return 0;
- }
- /* This function will be called by the pad-added signal */
- static void pad_added_handler (GstElement *src, GstPad *new_pad, CustomData *data) {
- GstPad *sink_pad = gst_element_get_static_pad (data->convert, "sink");
- GstPadLinkReturn ret;
- GstCaps *new_pad_caps = NULL;
- GstStructure *new_pad_struct = NULL;
- const gchar *new_pad_type = NULL;
- g_print ("Received new pad '%s' from '%s':\n", GST_PAD_NAME (new_pad), GST_ELEMENT_NAME (src));
- /* If our converter is already linked, we have nothing to do here */
- if (gst_pad_is_linked (sink_pad)) {
- g_print ("We are already linked. Ignoring.\n");
- goto exit;
- }
- /* Check the new pad's type */
- new_pad_caps = gst_pad_get_current_caps (new_pad);
- new_pad_struct = gst_caps_get_structure (new_pad_caps, 0);
- new_pad_type = gst_structure_get_name (new_pad_struct);
- if (!g_str_has_prefix (new_pad_type, "audio/x-raw")) {
- g_print ("It has type '%s' which is not raw audio. Ignoring.\n", new_pad_type);
- goto exit;
- }
- /* Attempt the link */
- ret = gst_pad_link (new_pad, sink_pad);
- if (GST_PAD_LINK_FAILED (ret)) {
- g_print ("Type is '%s' but link failed.\n", new_pad_type);
- } else {
- g_print ("Link succeeded (type '%s').\n", new_pad_type);
- }
- exit:
- /* Unreference the new pad's caps, if we got them */
- if (new_pad_caps != NULL)
- gst_caps_unref (new_pad_caps);
- /* Unreference the sink pad */
- gst_object_unref (sink_pad);
- ]#
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