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- #include <gst/gst.h>
- /* Structure to contain all our information, so we can pass it around */
- typedef struct _CustomData {
- GstElement *playbin; /* Our one and only element */
- gboolean playing; /* Are we in the PLAYING state? */
- gboolean terminate; /* Should we terminate execution? */
- gboolean seek_enabled; /* Is seeking enabled for this media? */
- gboolean seek_done; /* Have we performed the seek already? */
- gint64 duration; /* How long does this media last, in nanoseconds */
- } CustomData;
- /* Forward definition of the message processing function */
- static void handle_message (CustomData *data, GstMessage *msg);
- int main(int argc, char *argv[]) {
- CustomData data;
- GstBus *bus;
- GstMessage *msg;
- GstStateChangeReturn ret;
- data.playing = FALSE;
- data.terminate = FALSE;
- data.seek_enabled = FALSE;
- data.seek_done = FALSE;
- data.duration = GST_CLOCK_TIME_NONE;
- /* Initialize GStreamer */
- gst_init (&argc, &argv);
- /* Create the elements */
- data.playbin = gst_element_factory_make ("playbin", "playbin");
- if (!data.playbin) {
- g_printerr ("Not all elements could be created.\n");
- return -1;
- }
- /* Set the URI to play */
- g_object_set (data.playbin, "uri", "http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
- /* Start playing */
- ret = gst_element_set_state (data.playbin, GST_STATE_PLAYING);
- if (ret == GST_STATE_CHANGE_FAILURE) {
- g_printerr ("Unable to set the pipeline to the playing state.\n");
- gst_object_unref (data.playbin);
- return -1;
- }
- /* Listen to the bus */
- bus = gst_element_get_bus (data.playbin);
- do {
- msg = gst_bus_timed_pop_filtered (bus, 100 * GST_MSECOND,
- GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS | GST_MESSAGE_DURATION);
- /* Parse message */
- if (msg != NULL) {
- handle_message (&data, msg);
- } else {
- /* We got no message, this means the timeout expired */
- if (data.playing) {
- gint64 current = -1;
- /* Query the current position of the stream */
- if (!gst_element_query_position (data.playbin, GST_FORMAT_TIME, ¤t)) {
- g_printerr ("Could not query current position.\n");
- }
- /* If we didn't know it yet, query the stream duration */
- if (!GST_CLOCK_TIME_IS_VALID (data.duration)) {
- if (!gst_element_query_duration (data.playbin, GST_FORMAT_TIME, &data.duration)) {
- g_printerr ("Could not query current duration.\n");
- }
- }
- /* Print current position and total duration */
- g_print ("Position %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT "\r",
- GST_TIME_ARGS (current), GST_TIME_ARGS (data.duration));
- /* If seeking is enabled, we have not done it yet, and the time is right, seek */
- if (data.seek_enabled && !data.seek_done && current > 10 * GST_SECOND) {
- g_print ("\nReached 10s, performing pause...\n");
- ret = gst_element_set_state (data.playbin, GST_STATE_PAUSED);
- if (ret == GST_STATE_CHANGE_FAILURE) {
- g_printerr ("Unable to set the pipeline to the playing state.\n");
- gst_object_unref (data.playbin);
- return -1;
- }
- g_print ("\nReached 10s, performing seek...\n");
- gst_element_seek_simple (data.playbin, GST_FORMAT_TIME,
- GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, 30 * GST_SECOND);
- data.seek_done = TRUE;
- }
- }
- }
- } while (!data.terminate);
- /* Free resources */
- gst_object_unref (bus);
- gst_element_set_state (data.playbin, GST_STATE_NULL);
- gst_object_unref (data.playbin);
- return 0;
- }
- static void handle_message (CustomData *data, GstMessage *msg) {
- 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);
- data->terminate = TRUE;
- break;
- case GST_MESSAGE_EOS:
- g_print ("End-Of-Stream reached.\n");
- data->terminate = TRUE;
- break;
- case GST_MESSAGE_DURATION:
- /* The duration has changed, mark the current one as invalid */
- data->duration = GST_CLOCK_TIME_NONE;
- break;
- case GST_MESSAGE_STATE_CHANGED: {
- GstState old_state, new_state, pending_state;
- gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
- if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin)) {
- g_print ("Pipeline state changed from %s to %s:\n",
- gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
- /* Remember whether we are in the PLAYING state or not */
- data->playing = (new_state == GST_STATE_PLAYING);
- if (data->playing) {
- /* We just moved to PLAYING. Check if seeking is possible */
- GstQuery *query;
- gint64 start, end;
- query = gst_query_new_seeking (GST_FORMAT_TIME);
- if (gst_element_query (data->playbin, query)) {
- gst_query_parse_seeking (query, NULL, &data->seek_enabled, &start, &end);
- if (data->seek_enabled) {
- g_print ("Seeking is ENABLED from %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT "\n",
- GST_TIME_ARGS (start), GST_TIME_ARGS (end));
- } else {
- g_print ("Seeking is DISABLED for this stream.\n");
- }
- }
- else {
- g_printerr ("Seeking query failed.");
- }
- gst_query_unref (query);
- }
- }
- } break;
- default:
- /* We should not reach here */
- g_printerr ("Unexpected message received.\n");
- break;
- }
- gst_message_unref (msg);
- }
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