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142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* GStreamer RealMedia utility functions
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 "rmutils.h"
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gchar *
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gst_rm_utils_read_string8 (const guint8 * data, guint datalen,
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guint * p_total_len)
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{
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gint length;
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if (p_total_len)
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*p_total_len = 0;
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if (datalen < 1)
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return NULL;
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length = GST_READ_UINT8 (data);
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if (datalen < (1 + length))
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return NULL;
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if (p_total_len)
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*p_total_len = 1 + length;
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return g_strndup ((gchar *) data + 1, length);
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}
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gchar *
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gst_rm_utils_read_string16 (const guint8 * data, guint datalen,
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guint * p_total_len)
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{
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gint length;
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if (p_total_len)
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*p_total_len = 0;
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if (datalen < 2)
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return NULL;
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length = GST_READ_UINT16_BE (data);
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if (datalen < (2 + length))
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return NULL;
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if (p_total_len)
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*p_total_len = 2 + length;
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return g_strndup ((gchar *) data + 2, length);
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}
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GstTagList *
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gst_rm_utils_read_tags (const guint8 * data, guint datalen,
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GstRmUtilsStringReadFunc read_string_func)
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{
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const gchar *gst_tags[] = { GST_TAG_TITLE, GST_TAG_ARTIST,
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GST_TAG_COPYRIGHT, GST_TAG_COMMENT
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};
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GstTagList *tags;
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guint i;
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g_assert (read_string_func != NULL);
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GST_DEBUG ("File Content : (CONT) len = %d", datalen);
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tags = gst_tag_list_new ();
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for (i = 0; i < G_N_ELEMENTS (gst_tags); ++i) {
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gchar *str = NULL;
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guint total_length = 0;
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str = read_string_func (data, datalen, &total_length);
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data += total_length;
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datalen -= total_length;
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if (str != NULL && !g_utf8_validate (str, -1, NULL)) {
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const gchar *encoding;
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gchar *tmp;
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encoding = g_getenv ("GST_TAG_ENCODING");
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if (encoding == NULL || *encoding == '\0') {
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if (g_get_charset (&encoding))
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encoding = "ISO-8859-15";
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}
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GST_DEBUG ("converting tag from %s to UTF-8", encoding);
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tmp = g_convert_with_fallback (str, -1, "UTF-8", encoding, (gchar *) "*",
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NULL, NULL, NULL);
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g_free (str);
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str = tmp;
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}
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GST_DEBUG ("%s = %s", gst_tags[i], GST_STR_NULL (str));
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if (str != NULL && *str != '\0') {
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gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, gst_tags[i], str, NULL);
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}
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g_free (str);
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}
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if (gst_structure_n_fields ((GstStructure *) tags) > 0)
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return tags;
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gst_tag_list_free (tags);
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return NULL;
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}
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GstBuffer *
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gst_rm_utils_descramble_dnet_buffer (GstBuffer * buf)
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{
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guint8 *data, *end, tmp;
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buf = gst_buffer_make_writable (buf);
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/* dnet = byte-order swapped AC3 */
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data = GST_BUFFER_DATA (buf);
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end = GST_BUFFER_DATA (buf) + GST_BUFFER_SIZE (buf);
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while ((data + 1) < end) {
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/* byte-swap */
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tmp = data[0];
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data[0] = data[1];
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data[1] = tmp;
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data += sizeof (guint16);
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}
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return buf;
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}
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