adds some useful comments after some of the #else, #elseif,

[ffmpeg] / libavcodec / ac3tab.h

diff --git a/libavcodec/ac3tab.h b/libavcodec/ac3tab.h
index 3621b87a71b607a1a5f39f8fd069766f88e67761..9f90ae95c54ca47dc6f2eab69dc6854d2de831dc 100644 (file)
--- a/libavcodec/ac3tab.h
+++ b/libavcodec/ac3tab.h
@@ -1,3 +1,24 @@
+/*
+ * AC3 tables
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
 /**
  * @file ac3tab.h
  * tables taken directly from AC3 spec.
@@ -12,6 +33,44 @@ static const uint16_t ac3_bitratetab[19] = {
     160, 192, 224, 256, 320, 384, 448, 512, 576, 640
 };
 
+/* AC3 MDCT window */
+
+/* MDCT window */
+static const int16_t ac3_window[256] = {
+    4,    7,   12,   16,   21,   28,   34,   42,
+   51,   61,   72,   84,   97,  111,  127,  145,
+  164,  184,  207,  231,  257,  285,  315,  347,
+  382,  419,  458,  500,  544,  591,  641,  694,
+  750,  810,  872,  937, 1007, 1079, 1155, 1235,
+ 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
+ 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
+ 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
+ 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
+ 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
+ 8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
+10660,10960,11264,11570,11879,12190,12504,12820,
+13138,13458,13780,14103,14427,14753,15079,15407,
+15735,16063,16392,16720,17049,17377,17705,18032,
+18358,18683,19007,19330,19651,19970,20287,20602,
+20914,21225,21532,21837,22139,22438,22733,23025,
+23314,23599,23880,24157,24430,24699,24964,25225,
+25481,25732,25979,26221,26459,26691,26919,27142,
+27359,27572,27780,27983,28180,28373,28560,28742,
+28919,29091,29258,29420,29577,29729,29876,30018,
+30155,30288,30415,30538,30657,30771,30880,30985,
+31086,31182,31274,31363,31447,31528,31605,31678,
+31747,31814,31877,31936,31993,32046,32097,32145,
+32190,32232,32272,32310,32345,32378,32409,32438,
+32465,32490,32513,32535,32556,32574,32592,32608,
+32623,32636,32649,32661,32671,32681,32690,32698,
+32705,32712,32718,32724,32729,32733,32737,32741,
+32744,32747,32750,32752,32754,32756,32757,32759,
+32760,32761,32762,32763,32764,32764,32765,32765,
+32766,32766,32766,32766,32767,32767,32767,32767,
+32767,32767,32767,32767,32767,32767,32767,32767,
+32767,32767,32767,32767,32767,32767,32767,32767,
+};
+
 static uint8_t masktab[253];
 
 static const uint8_t latab[260]= {
@@ -122,7 +181,7 @@ static const uint16_t dbkneetab[4]= {
     0x000, 0x700, 0x900, 0xb00,
 };
 
-static const uint16_t floortab[8]= {
+static const int16_t floortab[8]= {
     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 };
 
@@ -138,9 +197,6 @@ static const uint8_t bndsz[50]={
 
 static uint8_t bndtab[51];
 
-/* AC3 MDCT window */
-static int16_t ac3_window[256];
-
 /* fft & mdct sin cos tables */
 static int16_t costab[64];
 static int16_t sintab[64];