<div dir="ltr"> <div class="gmail_quote"><div dir="ltr"><div>Hi, </div><div>Following is my code for a very basic file player. It is using playbin. </div><div>Basically I am trying to understand the tric play functionalities of gstreamer pipelines. </div> <div>I am very new to gstreamer world. </div><div>I noticed that every time I change the speed the pipline freezes for few seconds and then reflects the change. </div><div>I am using VAAPI enabled system. any way to debug specifically the cause of those frozen moments. </div><div>Thanks in advance. </div><div> #include <string.h> #include <gst/gst.h> #include <iostream> #include <stdio.h> typedef struct _CustomData { GstElement *pipeline; GstElement *video_sink; GMainLoop *loop; gboolean playing; /* Playing or Paused */ gdouble rate; /* Current playback rate (can be negative) */ } CustomData; /* Send seek event to change rate */ static void send_seek_event (CustomData *data) { gint64 position; GstFormat format = GST_FORMAT_TIME; GstEvent *seek_event; g_print(" SEEK EVENT RECEIVED. \n"); /* Obtain the current position, needed for the seek event */ if (!gst_element_query_position (data->pipeline, format, &position)) { g_printerr ("Unable to retrieve current position.\n"); return; } /* Create the seek event */ if (data->rate > 0) { seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, /*GST_SEEK_FLAG_FLUSH |*/ GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE,0); } else { seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, /*GST_SEEK_FLAG_FLUSH |*/ GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET,0, GST_SEEK_TYPE_SET, position); } if (data->video_sink == NULL) { /* If we have not done so, obtain the sink through which we will send the seek events */ g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL); } /* Send the event */ gst_element_send_event (data->video_sink, seek_event); g_print ("Current rate: %g\n", data->rate); } /* Process keyboard input */ static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) { gchar *str = NULL; if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) != G_IO_STATUS_NORMAL) { return TRUE; } switch (g_ascii_tolower (str[0])) { case 'p': data->playing = !data->playing; gst_element_set_state (data->pipeline, data->playing ? GST_STATE_PLAYING : GST_STATE_PAUSED); g_print ("Setting state to %s\n", data->playing ? "PLAYING" : "PAUSE"); break; case 's': if (g_ascii_isupper (str[0])) { data->rate *= 2.0; } else { data->rate /= 2.0; } send_seek_event (data); break; case 'd': data->rate *= -1.0; send_seek_event (data); break; case 'n': if (data->video_sink == NULL) { /* If we have not done so, obtain the sink through which we will send the step events */ g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL); } gst_element_send_event (data->video_sink, gst_event_new_step (GST_FORMAT_BUFFERS, 1, data->rate, TRUE, FALSE)); g_print ("Stepping one frame\n"); break; case 'q': g_main_loop_quit (data->loop); break; default: break; } g_free (str); return TRUE; } int main(int argc, char *argv[]) { CustomData data; GstStateChangeReturn ret; GIOChannel *io_stdin; /* Initialize GStreamer */ gst_init (&argc, &argv); /* Initialize our data structure */ memset (&data, 0, sizeof (data)); /* Print usage map */ g_print ( "USAGE: Choose one of the following options, then press enter:\n" " 'P' to toggle between PAUSE and PLAY\n" " 'S' to increase playback speed, 's' to decrease playback speed\n" " 'D' to toggle playback direction\n" " 'N' to move to next frame (in the current direction, better in PAUSE)\n" " 'Q' to quit\n"); /* Build the pipeline */ // data.pipeline = gst_parse_launch ("playbin2 uri=<a href="http://docs.gstreamer.com/media/sintel_trailer-480p.webm" target="_blank">http://docs.gstreamer.com/media/sintel_trailer-480p.webm</a>", NULL); data.pipeline = gst_parse_launch ("playbin uri=file:///home/ufouser/Tata_1080p24_H264.mp4", NULL); /* Add a keyboard watch so we get notified of keystrokes */ #ifdef _WIN32 io_stdin = g_io_channel_win32_new_fd (fileno (stdin)); #else io_stdin = g_io_channel_unix_new (fileno (stdin)); #endif g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data); /* Start playing */ ret = gst_element_set_state (data.pipeline, 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.pipeline); return -1; } data.playing = TRUE; data.rate = 1.0; /* Create a GLib Main Loop and set it to run */ data.loop = g_main_loop_new (NULL, FALSE); g_main_loop_run (data.loop); /* Free resources */ g_main_loop_unref (data.loop); g_io_channel_unref (io_stdin); gst_element_set_state (data.pipeline, GST_STATE_NULL); if (data.video_sink != NULL) gst_object_unref (data.video_sink); gst_object_unref (data.pipeline); return 0; } </div></div></div><div> </div>-- Regards Subodh </div>