4 /* Structure to contain all our information, so we can pass it around */
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5 typedef struct _CustomData {
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6 GstElement *playbin; /* Our one and only element */
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8 gint n_video; /* Number of embedded video streams */
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9 gint n_audio; /* Number of embedded audio streams */
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10 gint n_text; /* Number of embedded subtitle streams */
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12 gint current_video; /* Currently playing video stream */
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13 gint current_audio; /* Currently playing audio stream */
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14 gint current_text; /* Currently playing subtitle stream */
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16 GMainLoop *main_loop; /* GLib's Main Loop */
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21 GST_PLAY_FLAG_VIDEO = (1 << 0), /* We want video output */
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22 GST_PLAY_FLAG_AUDIO = (1 << 1), /* We want audio output */
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23 GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
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26 /* Forward definition for the message and keyboard processing functions */
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27 static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data);
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28 static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data);
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30 int main(int argc, char *argv[]) {
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33 GstStateChangeReturn ret;
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35 GIOChannel *io_stdin;
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37 /* Initialize GStreamer */
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38 gst_init (&argc, &argv);
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40 /* Create the elements */
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41 data.playbin = gst_element_factory_make ("playbin", "playbin");
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43 if (!data.playbin) {
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44 g_printerr ("Not all elements could be created.\n");
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48 /* Set the URI to play */
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49 g_object_set (data.playbin, "uri", "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_cropped_multilingual.webm", NULL);
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51 /* Set flags to show Audio and Video but ignore Subtitles */
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52 g_object_get (data.playbin, "flags", &flags, NULL);
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53 flags |= GST_PLAY_FLAG_VIDEO | GST_PLAY_FLAG_AUDIO;
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54 flags &= ~GST_PLAY_FLAG_TEXT;
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55 g_object_set (data.playbin, "flags", flags, NULL);
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57 /* Set connection speed. This will affect some internal decisions of playbin */
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58 g_object_set (data.playbin, "connection-speed", 56, NULL);
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60 /* Add a bus watch, so we get notified when a message arrives */
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61 bus = gst_element_get_bus (data.playbin);
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62 gst_bus_add_watch (bus, (GstBusFunc)handle_message, &data);
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64 /* Add a keyboard watch so we get notified of keystrokes */
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66 io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
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68 io_stdin = g_io_channel_unix_new (fileno (stdin));
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70 g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data);
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73 ret = gst_element_set_state (data.playbin, GST_STATE_PLAYING);
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74 if (ret == GST_STATE_CHANGE_FAILURE) {
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75 g_printerr ("Unable to set the pipeline to the playing state.\n");
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76 gst_object_unref (data.playbin);
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80 /* Create a GLib Main Loop and set it to run */
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81 data.main_loop = g_main_loop_new (NULL, FALSE);
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82 g_main_loop_run (data.main_loop);
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84 /* Free resources */
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85 g_main_loop_unref (data.main_loop);
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86 g_io_channel_unref (io_stdin);
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87 gst_object_unref (bus);
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88 gst_element_set_state (data.playbin, GST_STATE_NULL);
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89 gst_object_unref (data.playbin);
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93 /* Extract some metadata from the streams and print it on the screen */
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94 static void analyze_streams (CustomData *data) {
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100 /* Read some properties */
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101 g_object_get (data->playbin, "n-video", &data->n_video, NULL);
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102 g_object_get (data->playbin, "n-audio", &data->n_audio, NULL);
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103 g_object_get (data->playbin, "n-text", &data->n_text, NULL);
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105 g_print ("%d video stream(s), %d audio stream(s), %d text stream(s)\n",
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106 data->n_video, data->n_audio, data->n_text);
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109 for (i = 0; i < data->n_video; i++) {
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111 /* Retrieve the stream's video tags */
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112 g_signal_emit_by_name (data->playbin, "get-video-tags", i, &tags);
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114 g_print ("video stream %d:\n", i);
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115 gst_tag_list_get_string (tags, GST_TAG_VIDEO_CODEC, &str);
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116 g_print (" codec: %s\n", str ? str : "unknown");
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118 gst_tag_list_unref (tags);
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123 for (i = 0; i < data->n_audio; i++) {
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125 /* Retrieve the stream's audio tags */
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126 g_signal_emit_by_name (data->playbin, "get-audio-tags", i, &tags);
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128 g_print ("audio stream %d:\n", i);
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129 if (gst_tag_list_get_string (tags, GST_TAG_AUDIO_CODEC, &str)) {
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130 g_print (" codec: %s\n", str);
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133 if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
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134 g_print (" language: %s\n", str);
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137 if (gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &rate)) {
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138 g_print (" bitrate: %d\n", rate);
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140 gst_tag_list_unref (tags);
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145 for (i = 0; i < data->n_text; i++) {
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147 /* Retrieve the stream's subtitle tags */
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148 g_signal_emit_by_name (data->playbin, "get-text-tags", i, &tags);
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150 g_print ("subtitle stream %d:\n", i);
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151 if (gst_tag_list_get_string (tags, GST_TAG_LANGUAGE_CODE, &str)) {
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152 g_print (" language: %s\n", str);
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155 gst_tag_list_unref (tags);
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159 g_object_get (data->playbin, "current-video", &data->current_video, NULL);
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160 g_object_get (data->playbin, "current-audio", &data->current_audio, NULL);
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161 g_object_get (data->playbin, "current-text", &data->current_text, NULL);
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164 g_print ("Currently playing video stream %d, audio stream %d and text stream %d\n",
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165 data->current_video, data->current_audio, data->current_text);
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166 g_print ("Type any number and hit ENTER to select a different audio stream\n");
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169 /* Process messages from GStreamer */
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170 static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data) {
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174 switch (GST_MESSAGE_TYPE (msg)) {
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175 case GST_MESSAGE_ERROR:
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176 gst_message_parse_error (msg, &err, &debug_info);
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177 g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
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178 g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
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179 g_clear_error (&err);
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180 g_free (debug_info);
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181 g_main_loop_quit (data->main_loop);
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183 case GST_MESSAGE_EOS:
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184 g_print ("End-Of-Stream reached.\n");
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185 g_main_loop_quit (data->main_loop);
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187 case GST_MESSAGE_STATE_CHANGED: {
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188 GstState old_state, new_state, pending_state;
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189 gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
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190 if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->playbin)) {
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191 if (new_state == GST_STATE_PLAYING) {
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192 /* Once we are in the playing state, analyze the streams */
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193 analyze_streams (data);
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201 /* We want to keep receiving messages */
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205 /* Process keyboard input */
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206 static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
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209 if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) == G_IO_STATUS_NORMAL) {
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210 int index = g_ascii_strtoull (str, NULL, 0);
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211 if (index < 0 || index >= data->n_audio) {
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212 g_printerr ("Index out of bounds\n");
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214 /* If the input was a valid audio stream index, set the current audio stream */
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215 g_print ("Setting current audio stream to %d\n", index);
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216 g_object_set (data->playbin, "current-audio", index, NULL);
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