mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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217 lines
5.6 KiB
C
217 lines
5.6 KiB
C
/* GStreamer
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* Copyright (C) 2003 Thomas Vander Stichele <thomas@apestaart.org>
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* 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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* 2005 Andy Wingo <wingo@pobox.com>
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* 2005 Jan Schmidt <thaytan@mad.scientist.com>
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*
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* gst-metadata.c: Use GStreamer to display metadata within files.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <locale.h>
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#include <gst/gst.h>
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static char *filename = NULL;
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static GstElement *pipeline = NULL;
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static GstElement *source = NULL;
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#define NEW_PIPE_PER_FILE
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static gboolean
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message_loop (GstElement * element, GstTagList ** tags)
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{
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GstBus *bus;
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gboolean done = FALSE;
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bus = gst_element_get_bus (element);
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g_return_val_if_fail (bus != NULL, FALSE);
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g_return_val_if_fail (tags != NULL, FALSE);
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while (!done) {
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GstMessage *message;
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message = gst_bus_pop (bus);
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if (message == NULL)
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/* All messages read, we're done */
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break;
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switch (GST_MESSAGE_TYPE (message)) {
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case GST_MESSAGE_ERROR:
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case GST_MESSAGE_EOS:
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gst_message_unref (message);
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return TRUE;
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case GST_MESSAGE_TAG:
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{
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GstTagList *new_tags, *old_tags;
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gst_message_parse_tag (message, &new_tags);
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if (*tags) {
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old_tags = *tags;
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*tags = gst_tag_list_merge (old_tags, new_tags, GST_TAG_MERGE_KEEP);
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gst_tag_list_unref (old_tags);
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} else
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*tags = new_tags;
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break;
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}
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default:
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break;
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}
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gst_message_unref (message);
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}
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gst_object_unref (bus);
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return TRUE;
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}
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static void
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make_pipeline (void)
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{
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GstElement *decodebin;
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if (pipeline != NULL)
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gst_object_unref (pipeline);
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pipeline = gst_pipeline_new (NULL);
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source = gst_element_factory_make ("filesrc", "source");
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g_assert (GST_IS_ELEMENT (source));
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decodebin = gst_element_factory_make ("decodebin", "decodebin");
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g_assert (GST_IS_ELEMENT (decodebin));
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gst_bin_add_many (GST_BIN (pipeline), source, decodebin, NULL);
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gst_element_link (source, decodebin);
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}
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static void
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print_tag (const GstTagList * list, const gchar * tag, gpointer unused)
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{
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gint i, count;
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count = gst_tag_list_get_tag_size (list, tag);
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for (i = 0; i < count; i++) {
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gchar *str;
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if (gst_tag_get_type (tag) == G_TYPE_STRING) {
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if (!gst_tag_list_get_string_index (list, tag, i, &str))
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g_assert_not_reached ();
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} else {
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str =
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g_strdup_value_contents (gst_tag_list_get_value_index (list, tag, i));
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}
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if (i == 0) {
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g_print (" %15s: %s\n", gst_tag_get_nick (tag), str);
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} else {
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g_print (" : %s\n", str);
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}
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g_free (str);
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}
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}
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int
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main (int argc, char *argv[])
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{
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guint i = 1;
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setlocale (LC_ALL, "");
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gst_init (&argc, &argv);
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if (argc < 2) {
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g_print ("Please give filenames to read metadata from\n\n");
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return 1;
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}
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make_pipeline ();
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while (i < argc) {
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GstStateChangeReturn sret;
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GstState state;
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GstTagList *tags = NULL;
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filename = argv[i];
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g_object_set (source, "location", filename, NULL);
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GST_DEBUG ("Starting reading for %s", filename);
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/* Decodebin will only commit to PAUSED if it actually finds a type;
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* otherwise the state change fails */
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sret = gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PAUSED);
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if (GST_STATE_CHANGE_ASYNC == sret) {
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if (GST_STATE_CHANGE_SUCCESS !=
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gst_element_get_state (GST_ELEMENT (pipeline), &state, NULL,
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5 * GST_SECOND)) {
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g_print ("State change failed for %s. Aborting\n", filename);
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break;
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}
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} else if (sret != GST_STATE_CHANGE_SUCCESS) {
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g_print ("%s - Could not read file\n", filename);
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goto next_file;
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}
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if (!message_loop (GST_ELEMENT (pipeline), &tags)) {
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g_print ("Failed in message reading for %s\n", argv[i]);
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}
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if (tags) {
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g_print ("Metadata for %s:\n", argv[i]);
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gst_tag_list_foreach (tags, print_tag, NULL);
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gst_tag_list_unref (tags);
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tags = NULL;
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} else
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g_print ("No metadata found for %s\n", argv[i]);
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sret = gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
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#ifdef NEW_PIPE_PER_FILE
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if (sret != GST_STATE_CHANGE_SUCCESS) {
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g_print ("State change failed. Aborting\n");
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break;
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}
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#else
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if (GST_STATE_CHANGE_ASYNC == sret) {
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if (GST_STATE_CHANGE_FAILURE ==
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gst_element_get_state (GST_ELEMENT (pipeline), &state, NULL,
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GST_CLOCK_TIME_NONE)) {
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g_print ("State change failed. Aborting");
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break;
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}
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} else if (sret != GST_STATE_CHANGE_SUCCESS) {
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g_print ("State change failed. Aborting\n");
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break;
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}
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#endif
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next_file:
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i++;
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#ifdef NEW_PIPE_PER_FILE
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make_pipeline ();
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#endif
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}
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if (pipeline)
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gst_object_unref (pipeline);
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return 0;
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}
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