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294 lines
7 KiB
C
294 lines
7 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., 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 "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_empty ();
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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_tag_list_n_tags (tags) > 0)
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return tags;
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gst_tag_list_unref (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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GstMapInfo map;
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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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gst_buffer_map (buf, &map, GST_MAP_READWRITE);
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data = map.data;
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end = data + map.size;
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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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gst_buffer_unmap (buf, &map);
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return buf;
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}
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static void
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gst_rm_utils_swap_nibbles (guint8 * data, gint idx1, gint idx2, gint len)
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{
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guint8 *d1, *d2, tmp1 = 0, tmp2, tmp1n, tmp2n;
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if ((idx2 & 1) && !(idx1 & 1)) {
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/* align destination to a byte by swapping the indexes */
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tmp1 = idx1;
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idx1 = idx2;
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idx2 = tmp1;
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}
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d1 = data + (idx1 >> 1);
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d2 = data + (idx2 >> 1);
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/* check if we have aligned offsets and we can copy bytes */
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if ((idx1 & 1) == (idx2 & 1)) {
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if (idx1 & 1) {
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/* swap first nibble */
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tmp1 = *d1;
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tmp2 = *d2;
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*d1++ = (tmp2 & 0xf0) | (tmp1 & 0x0f);
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*d2++ = (tmp1 & 0xf0) | (tmp2 & 0x0f);
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len--;
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}
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for (; len > 1; len -= 2) {
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/* swap 2 nibbles */
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tmp1 = *d1;
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*d1++ = *d2;
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*d2++ = tmp1;
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}
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if (len) {
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/* swap leftover nibble */
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tmp1 = *d1;
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tmp2 = *d2;
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*d1 = (tmp2 & 0x0f) | (tmp1 & 0xf0);
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*d2 = (tmp1 & 0x0f) | (tmp2 & 0xf0);
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}
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} else {
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/* preload nibbles from source */
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tmp2n = *d1;
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tmp2 = *d2;
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for (; len > 1; len -= 2) {
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/* assemble nibbles */
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*d1++ = (tmp2n & 0x0f) | (tmp2 << 4);
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tmp1n = *d1;
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*d2++ = (tmp1n << 4) | (tmp1 >> 4);
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tmp1 = tmp1n;
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tmp2n = (tmp2 >> 4);
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tmp2 = *d2;
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}
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if (len) {
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/* last leftover */
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*d1 = (tmp2 << 4) | (tmp2n & 0x0f);
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*d2 = (tmp1 >> 4) | (tmp2 & 0xf0);
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} else {
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*d1 = (tmp1 & 0xf0) | (tmp2n);
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}
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}
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}
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static const gint sipr_swap_index[38][2] = {
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{0, 63}, {1, 22}, {2, 44}, {3, 90},
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{5, 81}, {7, 31}, {8, 86}, {9, 58},
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{10, 36}, {12, 68}, {13, 39}, {14, 73},
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{15, 53}, {16, 69}, {17, 57}, {19, 88},
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{20, 34}, {21, 71}, {24, 46}, {25, 94},
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{26, 54}, {28, 75}, {29, 50}, {32, 70},
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{33, 92}, {35, 74}, {38, 85}, {40, 56},
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{42, 87}, {43, 65}, {45, 59}, {48, 79},
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{49, 93}, {51, 89}, {55, 95}, {61, 76},
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{67, 83}, {77, 80}
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};
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GstBuffer *
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gst_rm_utils_descramble_sipr_buffer (GstBuffer * buf)
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{
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GstMapInfo map;
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gint n, bs;
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gsize size;
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size = gst_buffer_get_size (buf);
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/* split the packet in 96 blocks of nibbles */
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bs = size * 2 / 96;
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if (bs == 0)
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return buf;
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buf = gst_buffer_make_writable (buf);
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gst_buffer_map (buf, &map, GST_MAP_WRITE);
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/* we need to perform 38 swaps on the blocks */
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for (n = 0; n < 38; n++) {
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gint idx1, idx2;
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/* get the indexes of the blocks of nibbles that need swapping */
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idx1 = bs * sipr_swap_index[n][0];
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idx2 = bs * sipr_swap_index[n][1];
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/* swap the blocks */
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gst_rm_utils_swap_nibbles (map.data, idx1, idx2, bs);
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}
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gst_buffer_unmap (buf, &map);
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return buf;
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}
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void
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gst_rm_utils_run_tests (void)
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{
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#if 0
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guint8 tab1[] = { 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe };
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guint8 tab2[8];
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memcpy (tab2, tab1, 8);
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gst_util_dump_mem (tab2, 8);
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gst_rm_utils_swap_nibbles (tab2, 0, 8, 4);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 0, 8, 5);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 1, 8, 4);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 1, 8, 5);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 0, 9, 4);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 0, 9, 5);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 1, 9, 4);
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gst_util_dump_mem (tab2, 8);
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memcpy (tab2, tab1, 8);
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gst_rm_utils_swap_nibbles (tab2, 1, 9, 5);
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gst_util_dump_mem (tab2, 8);
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#endif
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}
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