mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2025-02-20 21:16:24 +00:00
Added code comments and more
This commit is contained in:
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parent
e01b6dd7f5
commit
04f87e2d06
1 changed files with 203 additions and 165 deletions
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@ -1,5 +1,8 @@
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#include <string.h>
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#include <gtk/gtk.h>
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#include <gst/gst.h>
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#include <gst/interfaces/xoverlay.h>
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#include <gdk/gdk.h>
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#if defined (GDK_WINDOWING_X11)
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@ -10,35 +13,29 @@
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#include <gdk/gdkquartzwindow.h>
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#endif
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#include <gst/interfaces/xoverlay.h>
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#include <memory.h>
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/* Structure to contain all our information, so we can pass it around */
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typedef struct _CustomData {
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GstElement *playbin2; /* Our one and only pipeline */
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GstElement *playbin2; /* Our one and only pipeline */
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GtkWidget *main_window;
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GtkWidget *video_window;
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GtkWidget *slider;
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GtkWidget *streams_list;
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gboolean updating_slider;
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GtkWidget *slider; /* Slider widget to keep track of current position */
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GtkWidget *streams_list; /* Text widget to display info about the streams */
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gulong slider_update_signal_id; /* Signal ID for the slider update signal */
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GstState state;
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gint64 duration;
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GstState state; /* Current state of the pipeline */
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gint64 duration; /* Duration of the clip, in nanoseconds */
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} CustomData;
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/* Forward definition of the message processing function */
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static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data);
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/* This function is called when the GUI toolkit creates the physical window that will hold the video.
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* At this point we can retrieve its handler (which has a different meaning depending on the windowing system)
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* and pass it to GStreamer through the XOverlay interface. */
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static void realize_cb (GtkWidget *widget, CustomData *data) {
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GdkWindow *window = gtk_widget_get_window (widget);
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guintptr window_handle;
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/* This is here just for pedagogical purposes, GDK_WINDOW_XID will call it
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* as well */
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if (!gdk_window_ensure_native (window))
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g_error ("Couldn't create native window needed for GstXOverlay!");
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/* Retrieve window handler from GDK */
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#if defined (GDK_WINDOWING_WIN32)
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window_handle = (guintptr)GDK_WINDOW_HWND (window);
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#elif defined (GDK_WINDOWING_QUARTZ)
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@ -46,32 +43,42 @@ static void realize_cb (GtkWidget *widget, CustomData *data) {
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#elif defined (GDK_WINDOWING_X11)
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window_handle = GDK_WINDOW_XID (window);
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#endif
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/* Pass it to playbin2, which implements XOverlay and will forward it to the video sink */
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gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->playbin2), window_handle);
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}
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/* This function is called when the PLAY button is clicked */
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static void play_cb (GtkButton *button, CustomData *data) {
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gst_element_set_state (data->playbin2, GST_STATE_PLAYING);
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}
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/* This function is called when the PAUSE button is clicked */
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static void pause_cb (GtkButton *button, CustomData *data) {
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gst_element_set_state (data->playbin2, GST_STATE_PAUSED);
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}
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/* This function is called when the STOP button is clicked */
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static void stop_cb (GtkButton *button, CustomData *data) {
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gst_element_set_state (data->playbin2, GST_STATE_READY);
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}
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/* This function is called when the main window is closed */
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static void delete_event_cb (GtkWidget *widget, GdkEvent *event, CustomData *data) {
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stop_cb (NULL, data);
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gtk_main_quit ();
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}
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static gboolean draw_cb (GtkWidget *widget, GdkEventExpose *event, CustomData *data) {
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/* This function is called everytime the video window needs to be redrawn (due to damage/exposure,
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* rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise,
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* we simply draw a black rectangle to avoid garbage showing up. */
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static gboolean expose_cb (GtkWidget *widget, GdkEventExpose *event, CustomData *data) {
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if (data->state < GST_STATE_PAUSED) {
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GtkAllocation allocation;
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GdkWindow *window = gtk_widget_get_window (widget);
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cairo_t *cr;
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/* Cairo is a 2D graphics library which we use here to clean the video window.
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* It is used by GStreamer for other reasons, so it will always be available to us. */
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gtk_widget_get_allocation (widget, &allocation);
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cr = gdk_cairo_create (window);
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cairo_set_source_rgb (cr, 0, 0, 0);
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@ -83,24 +90,30 @@ static gboolean draw_cb (GtkWidget *widget, GdkEventExpose *event, CustomData *d
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return FALSE;
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}
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/* This function is called when the slider changes its position. We perform a seek to the
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* new position here. */
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static void slider_cb (GtkRange *range, CustomData *data) {
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if (!data->updating_slider) {
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gdouble value = gtk_range_get_value (GTK_RANGE (data->slider));
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gst_element_seek_simple (data->playbin2, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, (gint64)(value * GST_SECOND));
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}
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gdouble value = gtk_range_get_value (GTK_RANGE (data->slider));
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gst_element_seek_simple (data->playbin2, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
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(gint64)(value * GST_SECOND));
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}
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/* This creates all the GTK+ widgets that compose our application, and registers the callbacks */
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static void create_ui (CustomData *data) {
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GtkWidget *controls, *main_box, *main_hbox;
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GtkWidget *play_button, *pause_button, *stop_button;
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GtkWidget *main_window; /* The uppermost window, containing all other windows */
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GtkWidget *video_window; /* The drawing area where the video will be shown */
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GtkWidget *main_box; /* VBox to hold main_hbox and the controls */
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GtkWidget *main_hbox; /* HBox to hold the video_window and the stream info text widget */
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GtkWidget *controls; /* HBox to hold the buttons and the slider */
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GtkWidget *play_button, *pause_button, *stop_button; /* Buttons */
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data->main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (G_OBJECT (data->main_window), "delete-event", G_CALLBACK (delete_event_cb), data);
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data->video_window = gtk_drawing_area_new ();
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gtk_widget_set_double_buffered (data->video_window, FALSE);
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g_signal_connect (data->video_window, "realize", G_CALLBACK (realize_cb), data);
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g_signal_connect (data->video_window, "expose_event", G_CALLBACK (draw_cb), data);
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main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (G_OBJECT (main_window), "delete-event", G_CALLBACK (delete_event_cb), data);
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video_window = gtk_drawing_area_new ();
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gtk_widget_set_double_buffered (video_window, FALSE);
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g_signal_connect (video_window, "realize", G_CALLBACK (realize_cb), data);
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g_signal_connect (video_window, "expose_event", G_CALLBACK (expose_cb), data);
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play_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_PLAY);
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g_signal_connect (G_OBJECT (play_button), "clicked", G_CALLBACK (play_cb), data);
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@ -113,8 +126,8 @@ static void create_ui (CustomData *data) {
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data->slider = gtk_hscale_new_with_range (0, 100, 1);
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gtk_scale_set_draw_value (GTK_SCALE (data->slider), 0);
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g_signal_connect (G_OBJECT (data->slider), "value-changed", G_CALLBACK (slider_cb), data);
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data->slider_update_signal_id = g_signal_connect (G_OBJECT (data->slider), "value-changed", G_CALLBACK (slider_cb), data);
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data->streams_list = gtk_text_view_new ();
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gtk_text_view_set_editable (GTK_TEXT_VIEW (data->streams_list), FALSE);
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@ -123,56 +136,187 @@ static void create_ui (CustomData *data) {
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gtk_box_pack_start (GTK_BOX (controls), pause_button, FALSE, FALSE, 2);
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gtk_box_pack_start (GTK_BOX (controls), stop_button, FALSE, FALSE, 2);
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gtk_box_pack_start (GTK_BOX (controls), data->slider, TRUE, TRUE, 2);
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main_hbox = gtk_hbox_new (FALSE, 0);
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gtk_box_pack_start (GTK_BOX (main_hbox), data->video_window, TRUE, TRUE, 0);
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gtk_box_pack_start (GTK_BOX (main_hbox), video_window, TRUE, TRUE, 0);
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gtk_box_pack_start (GTK_BOX (main_hbox), data->streams_list, FALSE, FALSE, 2);
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main_box = gtk_vbox_new (FALSE, 0);
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gtk_box_pack_start (GTK_BOX (main_box), main_hbox, TRUE, TRUE, 0);
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gtk_box_pack_start (GTK_BOX (main_box), controls, FALSE, FALSE, 0);
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gtk_container_add (GTK_CONTAINER (data->main_window), main_box);
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gtk_window_set_default_size (GTK_WINDOW (data->main_window), 640, 480);
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gtk_container_add (GTK_CONTAINER (main_window), main_box);
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gtk_window_set_default_size (GTK_WINDOW (main_window), 640, 480);
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gtk_widget_show_all (data->main_window);
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gtk_widget_realize (data->main_window);
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gtk_widget_show_all (main_window);
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}
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/* This function is called periodically to refresh the GUI */
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static gboolean refresh_ui (CustomData *data) {
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GstFormat fmt = GST_FORMAT_TIME;
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gint64 current = -1;
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/* We do not want to update anything unless we are in the PLAYING state */
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if (data->state != GST_STATE_PLAYING) return TRUE;
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if (data->state != GST_STATE_PLAYING)
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return TRUE;
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/* If we didn't know it yet, query the stream duration */
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if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
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if (!gst_element_query_duration (data->playbin2, &fmt, &data->duration)) {
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g_printerr ("Could not query current duration.\n");
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} else {
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/* Set the range of the slider to the clip duration, in SECONDS */
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gtk_range_set_range (GTK_RANGE (data->slider), 0, (gdouble)data->duration / GST_SECOND);
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}
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}
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if (gst_element_query_position (data->playbin2, &fmt, ¤t)) {
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data->updating_slider = TRUE;
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/* Block the "value-changed" signal, so the slider_cb function is not called
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* (which would trigger a seek the user has not requested) */
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g_signal_handler_block (data->slider, data->slider_update_signal_id);
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/* Set the position of the slider to the current pipeline positoin, in SECONDS */
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gtk_range_set_value (GTK_RANGE (data->slider), (gdouble)current / GST_SECOND);
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data->updating_slider = FALSE;
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/* Re-enable the signal */
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g_signal_handler_unblock (data->slider, data->slider_update_signal_id);
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}
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return TRUE;
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}
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static void reset_app (CustomData *data) {
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gst_object_unref (data->playbin2);
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}
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/* This function is called when new metadata is discovered in the stream */
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static void tags_cb (GstElement *playbin2, gint stream, CustomData *data) {
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/* We are possibly in a GStreamer working thread, so we notify the main
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* thread of this event through a message in the bus */
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gst_element_post_message (playbin2,
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gst_message_new_application (GST_OBJECT (playbin2),
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gst_structure_new ("tags-changed", NULL)));
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}
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/* This function is called when an error message is posted on the bus */
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static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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GError *err;
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gchar *debug_info;
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/* Print error details on the screen */
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gst_message_parse_error (msg, &err, &debug_info);
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g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
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g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
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g_clear_error (&err);
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g_free (debug_info);
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/* Set the pipeline to READY (which stops playback) */
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gst_element_set_state (data->playbin2, GST_STATE_READY);
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}
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/* This function is called when an End-Of-Stream message is posted on the bus.
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* We just set the pipeline to READY (which stops playback) */
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static void eos_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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g_print ("End-Of-Stream reached.\n");
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gst_element_set_state (data->playbin2, GST_STATE_READY);
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}
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/* This function is called when the pipeline changes states. We use it to
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* keep track of the current state. */
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static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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GstState old_state, new_state, pending_state;
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gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin2)) {
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data->state = new_state;
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g_print ("State set to %s\n", gst_element_state_get_name (new_state));
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}
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}
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/* Extract metadata from all the streams and write it to the text widget in the GUI */
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static void analyze_streams (CustomData *data) {
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gint i;
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GstTagList *tags;
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gchar *str, *total_str;
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guint rate;
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gint n_video, n_audio, n_text;
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GtkTextBuffer *text;
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/* Clean current contents of the widget */
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text = gtk_text_view_get_buffer (GTK_TEXT_VIEW (data->streams_list));
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gtk_text_buffer_set_text (text, "", -1);
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/* Read some properties */
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g_object_get (data->playbin2, "n-video", &n_video, NULL);
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g_object_get (data->playbin2, "n-audio", &n_audio, NULL);
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g_object_get (data->playbin2, "n-text", &n_text, NULL);
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for (i = 0; i < n_video; i++) {
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tags = NULL;
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/* Retrieve the stream's video tags */
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g_signal_emit_by_name (data->playbin2, "get-video-tags", i, &tags);
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if (tags) {
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total_str = g_strdup_printf ("video stream %d:\n", i);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
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total_str = g_strdup_printf (" codec: %s\n", str ? str : "unknown");
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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g_free (str);
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gst_tag_list_free (tags);
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}
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}
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for (i = 0; i < n_audio; i++) {
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tags = NULL;
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/* Retrieve the stream's audio tags */
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g_signal_emit_by_name (data->playbin2, "get-audio-tags", i, &tags);
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if (tags) {
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total_str = g_strdup_printf ("\naudio stream %d:\n", i);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
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total_str = g_strdup_printf (" codec: %s\n", str);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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g_free (str);
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}
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if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
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total_str = g_strdup_printf (" language: %s\n", str);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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g_free (str);
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}
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if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
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total_str = g_strdup_printf (" bitrate: %d\n", rate);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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}
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gst_tag_list_free (tags);
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}
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}
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for (i = 0; i < n_text; i++) {
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tags = NULL;
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/* Retrieve the stream's subtitle tags */
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g_signal_emit_by_name (data->playbin2, "get-text-tags", i, &tags);
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if (tags) {
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total_str = g_strdup_printf ("\nsubtitle stream %d:\n", i);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
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total_str = g_strdup_printf (" language: %s\n", str);
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gtk_text_buffer_insert_at_cursor (text, total_str, -1);
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g_free (total_str);
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g_free (str);
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}
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gst_tag_list_free (tags);
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}
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}
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}
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/* This function is called when an "application" message is posted on the bus.
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* Here we retrieve the message posted by the tags_cb callback */
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static void application_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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if (g_strcmp0 (gst_structure_get_name (msg->structure), "tags-changed") == 0) {
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/* If the message is the "tags-changed" (only one we are currently issuing), update
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* the stream info GUI */
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analyze_streams (data);
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}
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}
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int main(int argc, char *argv[]) {
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CustomData data;
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GstStateChangeReturn ret;
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@ -204,10 +348,16 @@ int main(int argc, char *argv[]) {
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g_signal_connect (G_OBJECT (data.playbin2), "audio-tags-changed", (GCallback) tags_cb, &data);
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g_signal_connect (G_OBJECT (data.playbin2), "text-tags-changed", (GCallback) tags_cb, &data);
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/* Create the GUI */
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create_ui (&data);
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/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
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bus = gst_element_get_bus (data.playbin2);
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gst_bus_add_watch (bus, (GstBusFunc)handle_message, &data);
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gst_bus_add_signal_watch (bus);
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g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
|
||||
g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback)eos_cb, &data);
|
||||
g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, &data);
|
||||
g_signal_connect (G_OBJECT (bus), "message::application", (GCallback)application_cb, &data);
|
||||
gst_object_unref (bus);
|
||||
|
||||
/* Start playing */
|
||||
|
|
@ -218,126 +368,14 @@ int main(int argc, char *argv[]) {
|
|||
return -1;
|
||||
}
|
||||
|
||||
/* Register a function that GTK will call every second */
|
||||
g_timeout_add (1000, (GSourceFunc)refresh_ui, &data);
|
||||
/* Register a function that GLib will call every second */
|
||||
g_timeout_add_seconds (1, (GSourceFunc)refresh_ui, &data);
|
||||
|
||||
/* Start the GTK main loop. We will not regain control until gtk_main_quit is called. */
|
||||
gtk_main ();
|
||||
|
||||
/* Free resources */
|
||||
gst_element_set_state (data.playbin2, GST_STATE_NULL);
|
||||
reset_app (&data);
|
||||
gst_object_unref (data.playbin2);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Extract metadata from all the streams */
|
||||
static void analyze_streams (CustomData *data) {
|
||||
gint i;
|
||||
GstTagList *tags;
|
||||
gchar *str, total_str[8192];
|
||||
guint rate;
|
||||
gint n_video, n_audio, n_text;
|
||||
GtkTextBuffer *text;
|
||||
GtkTextIter text_start, text_end;
|
||||
|
||||
/* Clean current contents of the widget */
|
||||
text = gtk_text_view_get_buffer (GTK_TEXT_VIEW (data->streams_list));
|
||||
gtk_text_buffer_get_start_iter (text, &text_start);
|
||||
gtk_text_buffer_get_end_iter (text, &text_end);
|
||||
gtk_text_buffer_delete (text, &text_start, &text_end);
|
||||
|
||||
/* Read some properties */
|
||||
g_object_get (data->playbin2, "n-video", &n_video, NULL);
|
||||
g_object_get (data->playbin2, "n-audio", &n_audio, NULL);
|
||||
g_object_get (data->playbin2, "n-text", &n_text, NULL);
|
||||
|
||||
for (i = 0; i < n_video; i++) {
|
||||
tags = NULL;
|
||||
/* Retrieve the stream's video tags */
|
||||
g_signal_emit_by_name (data->playbin2, "get-video-tags", i, &tags);
|
||||
if (tags) {
|
||||
g_snprintf (total_str, sizeof (total_str), "video stream %d:\n", i);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
|
||||
g_snprintf (total_str, sizeof (total_str), " codec: %s\n", str ? str : "unknown");
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
g_free (str);
|
||||
gst_tag_list_free (tags);
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < n_audio; i++) {
|
||||
tags = NULL;
|
||||
/* Retrieve the stream's audio tags */
|
||||
g_signal_emit_by_name (data->playbin2, "get-audio-tags", i, &tags);
|
||||
if (tags) {
|
||||
g_snprintf (total_str, sizeof (total_str), "\naudio stream %d:\n", i);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
|
||||
g_snprintf (total_str, sizeof (total_str), " codec: %s\n", str);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
g_free (str);
|
||||
}
|
||||
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
|
||||
g_snprintf (total_str, sizeof (total_str), " language: %s\n", str);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
g_free (str);
|
||||
}
|
||||
if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
|
||||
g_snprintf (total_str, sizeof (total_str), " bitrate: %d\n", rate);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
}
|
||||
gst_tag_list_free (tags);
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < n_text; i++) {
|
||||
tags = NULL;
|
||||
/* Retrieve the stream's subtitle tags */
|
||||
g_signal_emit_by_name (data->playbin2, "get-text-tags", i, &tags);
|
||||
if (tags) {
|
||||
g_snprintf (total_str, sizeof (total_str), "\nsubtitle stream %d:\n", i);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
|
||||
g_snprintf (total_str, sizeof (total_str), " language: %s\n", str);
|
||||
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
|
||||
g_free (str);
|
||||
}
|
||||
gst_tag_list_free (tags);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data) {
|
||||
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);
|
||||
gst_element_set_state (data->playbin2, GST_STATE_READY);
|
||||
break;
|
||||
case GST_MESSAGE_EOS:
|
||||
g_print ("End-Of-Stream reached.\n");
|
||||
gst_element_set_state (data->playbin2, GST_STATE_READY);
|
||||
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->playbin2)) {
|
||||
data->state = new_state;
|
||||
g_print ("State set to %s\n", gst_element_state_get_name (new_state));
|
||||
}
|
||||
} break;
|
||||
case GST_MESSAGE_APPLICATION:
|
||||
if (g_strcmp0 (gst_structure_get_name (msg->structure), "tags-changed") == 0) {
|
||||
analyze_streams (data);
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue