Update
This commit is contained in:
Akkariin Meiko
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#include <stdio.h>
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#include <gst/gst.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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{
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GstElement *playbin; /* Our one and only element */
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gint n_video; /* Number of embedded video streams */
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gint n_audio; /* Number of embedded audio streams */
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gint n_text; /* Number of embedded subtitle streams */
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gint current_video; /* Currently playing video stream */
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gint current_audio; /* Currently playing audio stream */
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gint current_text; /* Currently playing subtitle stream */
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GMainLoop *main_loop; /* GLib's Main Loop */
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} CustomData;
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/* playbin flags */
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typedef enum
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{
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GST_PLAY_FLAG_VIDEO = (1 << 0), /* We want video output */
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GST_PLAY_FLAG_AUDIO = (1 << 1), /* We want audio output */
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GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
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} GstPlayFlags;
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/* Forward definition for the message and keyboard processing functions */
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static gboolean handle_message (GstBus * bus, GstMessage * msg,
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CustomData * data);
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static gboolean handle_keyboard (GIOChannel * source, GIOCondition cond,
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CustomData * data);
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int
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main (int argc, char *argv[])
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{
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CustomData data;
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GstBus *bus;
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GstStateChangeReturn ret;
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gint flags;
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GIOChannel *io_stdin;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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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");
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return -1;
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}
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/* Set the URI to play */
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g_object_set (data.playbin, "uri",
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"https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.ogv",
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NULL);
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/* Set the subtitle URI to play and some font description */
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g_object_set (data.playbin, "suburi",
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"https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer_gr.srt",
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NULL);
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g_object_set (data.playbin, "subtitle-font-desc", "Sans, 18", NULL);
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/* Set flags to show Audio, Video and Subtitles */
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g_object_get (data.playbin, "flags", &flags, NULL);
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flags |= GST_PLAY_FLAG_VIDEO | GST_PLAY_FLAG_AUDIO | GST_PLAY_FLAG_TEXT;
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g_object_set (data.playbin, "flags", flags, NULL);
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/* Add a bus watch, so we get notified when a message arrives */
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bus = gst_element_get_bus (data.playbin);
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gst_bus_add_watch (bus, (GstBusFunc) handle_message, &data);
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/* Add a keyboard watch so we get notified of keystrokes */
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#ifdef G_OS_WIN32
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io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
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#else
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io_stdin = g_io_channel_unix_new (fileno (stdin));
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#endif
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g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc) handle_keyboard, &data);
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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) {
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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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}
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/* Create a GLib Main Loop and set it to run */
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data.main_loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (data.main_loop);
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/* Free resources */
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g_main_loop_unref (data.main_loop);
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g_io_channel_unref (io_stdin);
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gst_object_unref (bus);
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gst_element_set_state (data.playbin, GST_STATE_NULL);
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gst_object_unref (data.playbin);
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return 0;
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}
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/* Extract some metadata from the streams and print it on the screen */
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static void
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analyze_streams (CustomData * data)
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{
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gint i;
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GstTagList *tags;
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gchar *str;
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guint rate;
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/* Read some properties */
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g_object_get (data->playbin, "n-video", &data->n_video, NULL);
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g_object_get (data->playbin, "n-audio", &data->n_audio, NULL);
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g_object_get (data->playbin, "n-text", &data->n_text, NULL);
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g_print ("%d video stream(s), %d audio stream(s), %d text stream(s)\n",
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data->n_video, data->n_audio, data->n_text);
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g_print ("\n");
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for (i = 0; i < data->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->playbin, "get-video-tags", i, &tags);
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if (tags) {
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g_print ("video stream %d:\n", i);
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gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
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g_print (" codec: %s\n", str ? str : "unknown");
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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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g_print ("\n");
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for (i = 0; i < data->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->playbin, "get-audio-tags", i, &tags);
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if (tags) {
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g_print ("audio stream %d:\n", i);
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if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
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g_print (" codec: %s\n", 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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g_print (" language: %s\n", 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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g_print (" bitrate: %d\n", rate);
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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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g_print ("\n");
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for (i = 0; i < data->n_text; i++) {
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tags = NULL;
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/* Retrieve the stream's subtitle tags */
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g_print ("subtitle stream %d:\n", i);
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g_signal_emit_by_name (data->playbin, "get-text-tags", i, &tags);
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if (tags) {
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if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
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g_print (" language: %s\n", 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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} else {
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g_print (" no tags found\n");
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}
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}
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g_object_get (data->playbin, "current-video", &data->current_video, NULL);
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g_object_get (data->playbin, "current-audio", &data->current_audio, NULL);
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g_object_get (data->playbin, "current-text", &data->current_text, NULL);
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g_print ("\n");
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g_print
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("Currently playing video stream %d, audio stream %d and subtitle stream %d\n",
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data->current_video, data->current_audio, data->current_text);
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g_print
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("Type any number and hit ENTER to select a different subtitle stream\n");
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}
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/* Process messages from GStreamer */
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static gboolean
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handle_message (GstBus * bus, GstMessage * msg, CustomData * data)
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{
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GError *err;
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gchar *debug_info;
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:
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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",
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GST_OBJECT_NAME (msg->src), err->message);
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g_printerr ("Debugging information: %s\n",
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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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g_main_loop_quit (data->main_loop);
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break;
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case GST_MESSAGE_EOS:
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g_print ("End-Of-Stream reached.\n");
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g_main_loop_quit (data->main_loop);
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break;
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case GST_MESSAGE_STATE_CHANGED:{
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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,
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&pending_state);
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin)) {
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if (new_state == GST_STATE_PLAYING) {
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/* Once we are in the playing state, analyze the streams */
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analyze_streams (data);
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}
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}
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}
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break;
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default:
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break;
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}
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/* We want to keep receiving messages */
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return TRUE;
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}
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/* Process keyboard input */
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static gboolean
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handle_keyboard (GIOChannel * source, GIOCondition cond, CustomData * data)
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{
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gchar *str = NULL;
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if (g_io_channel_read_line (source, &str, NULL, NULL,
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NULL) == G_IO_STATUS_NORMAL) {
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int index = g_ascii_strtoull (str, NULL, 0);
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if (index < 0 || index >= data->n_text) {
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g_printerr ("Index out of bounds\n");
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} else {
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/* If the input was a valid subtitle stream index, set the current subtitle stream */
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g_print ("Setting current subtitle stream to %d\n", index);
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g_object_set (data->playbin, "current-text", index, NULL);
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}
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}
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g_free (str);
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return TRUE;
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}
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