gstreamer/subprojects/gst-docs/examples/tutorials/basic-tutorial-5.c

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#include <string.h>
#include <gtk/gtk.h>
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#include <gst/gst.h>
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#include <gst/video/videooverlay.h>
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#include <gdk/gdk.h>
#if defined (GDK_WINDOWING_X11)
#include <gdk/gdkx.h>
#elif defined (GDK_WINDOWING_WIN32)
#include <gdk/gdkwin32.h>
#elif defined (GDK_WINDOWING_QUARTZ)
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#include <gdk/gdkquartz.h>
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#endif
/* Structure to contain all our information, so we can pass it around */
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typedef struct _CustomData
{
GstElement *playbin; /* Our one and only pipeline */
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GtkWidget *slider; /* Slider widget to keep track of current position */
GtkWidget *streams_list; /* Text widget to display info about the streams */
gulong slider_update_signal_id; /* Signal ID for the slider update signal */
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GstState state; /* Current state of the pipeline */
gint64 duration; /* Duration of the clip, in nanoseconds */
} CustomData;
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/* This function is called when the GUI toolkit creates the physical window that will hold the video.
* At this point we can retrieve its handler (which has a different meaning depending on the windowing system)
* 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);
guintptr window_handle;
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if (!gdk_window_ensure_native (window))
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)
window_handle = gdk_quartz_window_get_nsview (window);
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#elif defined (GDK_WINDOWING_X11)
window_handle = GDK_WINDOW_XID (window);
#endif
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/* Pass it to playbin, which implements XOverlay and will forward it to the video sink */
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gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (data->playbin),
window_handle);
}
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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->playbin, GST_STATE_PLAYING);
}
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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->playbin, GST_STATE_PAUSED);
}
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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->playbin, GST_STATE_READY);
}
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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);
gtk_main_quit ();
}
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/* This function is called everytime the video window needs to be redrawn (due to damage/exposure,
* rescaling, etc). GStreamer takes care of this in the PAUSED and PLAYING states, otherwise,
* we simply draw a black rectangle to avoid garbage showing up. */
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static gboolean
draw_cb (GtkWidget * widget, cairo_t * cr, CustomData * data)
{
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if (data->state < GST_STATE_PAUSED) {
GtkAllocation allocation;
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/* Cairo is a 2D graphics library which we use here to clean the video window.
* 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);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_rectangle (cr, 0, 0, allocation.width, allocation.height);
cairo_fill (cr);
}
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return FALSE;
}
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/* This function is called when the slider changes its position. We perform a seek to the
* new position here. */
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static void
slider_cb (GtkRange * range, CustomData * data)
{
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gdouble value = gtk_range_get_value (GTK_RANGE (data->slider));
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gst_element_seek_simple (data->playbin, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
(gint64) (value * GST_SECOND));
}
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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)
{
GtkWidget *main_window; /* The uppermost window, containing all other windows */
GtkWidget *video_window; /* The drawing area where the video will be shown */
GtkWidget *main_box; /* VBox to hold main_hbox and the controls */
GtkWidget *main_hbox; /* HBox to hold the video_window and the stream info text widget */
GtkWidget *controls; /* HBox to hold the buttons and the slider */
GtkWidget *play_button, *pause_button, *stop_button; /* Buttons */
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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 ();
gtk_widget_set_double_buffered (video_window, FALSE);
g_signal_connect (video_window, "realize", G_CALLBACK (realize_cb), data);
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g_signal_connect (video_window, "draw", G_CALLBACK (draw_cb), data);
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play_button =
gtk_button_new_from_icon_name ("media-playback-start",
GTK_ICON_SIZE_SMALL_TOOLBAR);
g_signal_connect (G_OBJECT (play_button), "clicked", G_CALLBACK (play_cb),
data);
pause_button =
gtk_button_new_from_icon_name ("media-playback-pause",
GTK_ICON_SIZE_SMALL_TOOLBAR);
g_signal_connect (G_OBJECT (pause_button), "clicked", G_CALLBACK (pause_cb),
data);
stop_button =
gtk_button_new_from_icon_name ("media-playback-stop",
GTK_ICON_SIZE_SMALL_TOOLBAR);
g_signal_connect (G_OBJECT (stop_button), "clicked", G_CALLBACK (stop_cb),
data);
data->slider =
gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 100, 1);
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gtk_scale_set_draw_value (GTK_SCALE (data->slider), 0);
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data->slider_update_signal_id =
g_signal_connect (G_OBJECT (data->slider), "value-changed",
G_CALLBACK (slider_cb), data);
data->streams_list = gtk_text_view_new ();
gtk_text_view_set_editable (GTK_TEXT_VIEW (data->streams_list), FALSE);
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controls = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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gtk_box_pack_start (GTK_BOX (controls), play_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (controls), pause_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (controls), stop_button, FALSE, FALSE, 2);
gtk_box_pack_start (GTK_BOX (controls), data->slider, TRUE, TRUE, 2);
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main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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gtk_box_pack_start (GTK_BOX (main_hbox), video_window, TRUE, TRUE, 0);
gtk_box_pack_start (GTK_BOX (main_hbox), data->streams_list, FALSE, FALSE, 2);
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main_box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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 (main_window), main_box);
gtk_window_set_default_size (GTK_WINDOW (main_window), 640, 480);
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gtk_widget_show_all (main_window);
}
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/* This function is called periodically to refresh the GUI */
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static gboolean
refresh_ui (CustomData * data)
{
gint64 current = -1;
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/* We do not want to update anything unless we are in the PAUSED or PLAYING states */
if (data->state < GST_STATE_PAUSED)
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return TRUE;
/* If we didn't know it yet, query the stream duration */
if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
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if (!gst_element_query_duration (data->playbin, GST_FORMAT_TIME,
&data->duration)) {
g_printerr ("Could not query current duration.\n");
} 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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if (gst_element_query_position (data->playbin, GST_FORMAT_TIME, &current)) {
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/* Block the "value-changed" signal, so the slider_cb function is not called
* (which would trigger a seek the user has not requested) */
g_signal_handler_block (data->slider, data->slider_update_signal_id);
/* 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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/* Re-enable the signal */
g_signal_handler_unblock (data->slider, data->slider_update_signal_id);
}
return TRUE;
}
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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 * playbin, gint stream, CustomData * data)
{
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/* We are possibly in a GStreamer working thread, so we notify the main
* thread of this event through a message in the bus */
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gst_element_post_message (playbin,
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gst_message_new_application (GST_OBJECT (playbin),
gst_structure_new_empty ("tags-changed")));
}
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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;
gchar *debug_info;
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/* Print error details on the screen */
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");
g_clear_error (&err);
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->playbin, 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.
* 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->playbin, GST_STATE_READY);
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}
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/* This function is called when the pipeline changes states. We use it to
* 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;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin)) {
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data->state = new_state;
g_print ("State set to %s\n", gst_element_state_get_name (new_state));
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if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
/* For extra responsiveness, we refresh the GUI as soon as we reach the PAUSED state */
refresh_ui (data);
}
}
}
/* 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)
{
gint i;
GstTagList *tags;
gchar *str, *total_str;
guint rate;
gint n_video, n_audio, n_text;
GtkTextBuffer *text;
/* Clean current contents of the widget */
text = gtk_text_view_get_buffer (GTK_TEXT_VIEW (data->streams_list));
gtk_text_buffer_set_text (text, "", -1);
/* Read some properties */
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g_object_get (data->playbin, "n-video", &n_video, NULL);
g_object_get (data->playbin, "n-audio", &n_audio, NULL);
g_object_get (data->playbin, "n-text", &n_text, NULL);
for (i = 0; i < n_video; i++) {
tags = NULL;
/* Retrieve the stream's video tags */
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g_signal_emit_by_name (data->playbin, "get-video-tags", i, &tags);
if (tags) {
total_str = g_strdup_printf ("video stream %d:\n", i);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
total_str = g_strdup_printf (" codec: %s\n", str ? str : "unknown");
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
g_free (str);
gst_tag_list_free (tags);
}
}
for (i = 0; i < n_audio; i++) {
tags = NULL;
/* Retrieve the stream's audio tags */
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g_signal_emit_by_name (data->playbin, "get-audio-tags", i, &tags);
if (tags) {
total_str = g_strdup_printf ("\naudio stream %d:\n", i);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
total_str = g_strdup_printf (" codec: %s\n", str);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
g_free (str);
}
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
total_str = g_strdup_printf (" language: %s\n", str);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
g_free (str);
}
if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
total_str = g_strdup_printf (" bitrate: %d\n", rate);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
}
gst_tag_list_free (tags);
}
}
for (i = 0; i < n_text; i++) {
tags = NULL;
/* Retrieve the stream's subtitle tags */
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g_signal_emit_by_name (data->playbin, "get-text-tags", i, &tags);
if (tags) {
total_str = g_strdup_printf ("\nsubtitle stream %d:\n", i);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
total_str = g_strdup_printf (" language: %s\n", str);
gtk_text_buffer_insert_at_cursor (text, total_str, -1);
g_free (total_str);
g_free (str);
}
gst_tag_list_free (tags);
}
}
}
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/* This function is called when an "application" message is posted on the bus.
* 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)
{
if (g_strcmp0 (gst_structure_get_name (gst_message_get_structure (msg)),
"tags-changed") == 0) {
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/* If the message is the "tags-changed" (only one we are currently issuing), update
* the stream info GUI */
analyze_streams (data);
}
}
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int
main (int argc, char *argv[])
{
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CustomData data;
GstStateChangeReturn ret;
GstBus *bus;
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/* Initialize GTK */
gtk_init (&argc, &argv);
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/* Initialize GStreamer */
gst_init (&argc, &argv);
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/* Initialize our data structure */
memset (&data, 0, sizeof (data));
data.duration = GST_CLOCK_TIME_NONE;
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/* Create the elements */
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data.playbin = gst_element_factory_make ("playbin", "playbin");
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if (!data.playbin) {
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g_printerr ("Not all elements could be created.\n");
return -1;
}
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/* Set the URI to play */
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g_object_set (data.playbin, "uri",
"https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
NULL);
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/* Connect to interesting signals in playbin */
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g_signal_connect (G_OBJECT (data.playbin), "video-tags-changed",
(GCallback) tags_cb, &data);
g_signal_connect (G_OBJECT (data.playbin), "audio-tags-changed",
(GCallback) tags_cb, &data);
g_signal_connect (G_OBJECT (data.playbin), "text-tags-changed",
(GCallback) tags_cb, &data);
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/* Create the GUI */
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.playbin);
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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);
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gst_object_unref (bus);
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/* Start playing */
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ret = gst_element_set_state (data.playbin, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
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gst_object_unref (data.playbin);
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return -1;
}
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/* Register a function that GLib will call every second */
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g_timeout_add_seconds (1, (GSourceFunc) refresh_ui, &data);
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/* Start the GTK main loop. We will not regain control until gtk_main_quit is called. */
gtk_main ();
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/* Free resources */
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gst_element_set_state (data.playbin, GST_STATE_NULL);
gst_object_unref (data.playbin);
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return 0;
}