1 files changed, 77 insertions, 0 deletions
diff --git a/faad2/src/libfaad/ms.c b/faad2/src/libfaad/ms.c
new file mode 100644
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+++ b/faad2/src/libfaad/ms.c
@@ -0,0 +1,77 @@
+/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
+**  
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+** 
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+** 
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software 
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+**
+** Any non-GPL usage of this software or parts of this software is strictly
+** forbidden.
+**
+** The "appropriate copyright message" mentioned in section 2c of the GPLv2
+** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
+**
+** $Id: ms.c,v 1.21 2007/11/01 12:33:32 menno Exp $
+**/
+
+#include "common.h"
+#include "structs.h"
+
+#include "syntax.h"
+#include "ms.h"
+#include "is.h"
+#include "pns.h"
+
+void ms_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec,
+               uint16_t frame_len)
+{
+    uint8_t g, b, sfb;
+    uint8_t group = 0;
+    uint16_t nshort = frame_len/8;
+
+    uint16_t i, k;
+    real_t tmp;
+
+    if (ics->ms_mask_present >= 1)
+    {
+        for (g = 0; g < ics->num_window_groups; g++) 
+        {
+            for (b = 0; b < ics->window_group_length[g]; b++)
+            {
+                for (sfb = 0; sfb < ics->max_sfb; sfb++)
+                {
+                    /* If intensity stereo coding or noise substitution is on
+                       for a particular scalefactor band, no M/S stereo decoding
+                       is carried out.
+                     */
+                    if ((ics->ms_used[g][sfb] || ics->ms_mask_present == 2) &&
+                        !is_intensity(icsr, g, sfb) && !is_noise(ics, g, sfb))
+                    {
+                        for (i = ics->swb_offset[sfb]; i < min(ics->swb_offset[sfb+1], ics->swb_offset_max); i++)
+                        {
+                            k = (group*nshort) + i;
+                            tmp = l_spec[k] - r_spec[k];
+                            l_spec[k] = l_spec[k] + r_spec[k];
+                            r_spec[k] = tmp;
+                        }
+                    }
+                }
+                group++;
+            }
+        }
+    }
+}