[FFmpeg-cvslog] r20536 - in trunk/libavcodec: als_data.h alsdec.c

[thilo.borgmann]

Author: thilo.borgmann
Date: Sat Nov 14 12:49:48 2009
New Revision: 20536

Log:
Merge data tables from als_data.h with the decoder source to reduce
code complexity.

Deleted:
   trunk/libavcodec/als_data.h
Modified:
   trunk/libavcodec/alsdec.c

Modified: trunk/libavcodec/alsdec.c
==============================================================================
--- trunk/libavcodec/alsdec.c	Sat Nov 14 12:19:08 2009	(r20535)
+++ trunk/libavcodec/alsdec.c	Sat Nov 14 12:49:48 2009	(r20536)
@@ -35,7 +35,79 @@
 #include "mpeg4audio.h"
 #include "bytestream.h"
 
-#include "als_data.h"
+#include <stdint.h>
+
+/** Rice parameters and corresponding index offsets for decoding the
+ *  indices of scaled PARCOR values. The table choosen is set globally
+ *  by the encoder and stored in ALSSpecificConfig.
+ */
+static const int8_t parcor_rice_table[3][20][2] = {
+    { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
+      { 12, 3}, { -7, 3}, {  9, 3}, { -5, 3}, {  6, 3},
+      { -4, 3}, {  3, 3}, { -3, 2}, {  3, 2}, { -2, 2},
+      {  3, 2}, { -1, 2}, {  2, 2}, { -1, 2}, {  2, 2} },
+    { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
+      { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
+      {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
+      {  7, 3}, { -4, 4}, {  3, 3}, { -1, 3}, {  1, 3} },
+    { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
+      { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
+      {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
+      {  3, 3}, {  0, 3}, { -1, 3}, {  2, 3}, { -1, 2} }
+};
+
+
+/** Scaled PARCOR values used for the first two PARCOR coefficients.
+ *  To be indexed by the Rice coded indices.
+ *  Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
+ *  Actual values are divided by 32 in order to be stored in 16 bits.
+ */
+static const int16_t parcor_scaled_values[] = {
+    -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
+    -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
+    -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
+    -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
+    -1013728 / 32, -1009376 / 32, -1004768 / 32,  -999904 / 32,
+     -994784 / 32,  -989408 / 32,  -983776 / 32,  -977888 / 32,
+     -971744 / 32,  -965344 / 32,  -958688 / 32,  -951776 / 32,
+     -944608 / 32,  -937184 / 32,  -929504 / 32,  -921568 / 32,
+     -913376 / 32,  -904928 / 32,  -896224 / 32,  -887264 / 32,
+     -878048 / 32,  -868576 / 32,  -858848 / 32,  -848864 / 32,
+     -838624 / 32,  -828128 / 32,  -817376 / 32,  -806368 / 32,
+     -795104 / 32,  -783584 / 32,  -771808 / 32,  -759776 / 32,
+     -747488 / 32,  -734944 / 32,  -722144 / 32,  -709088 / 32,
+     -695776 / 32,  -682208 / 32,  -668384 / 32,  -654304 / 32,
+     -639968 / 32,  -625376 / 32,  -610528 / 32,  -595424 / 32,
+     -580064 / 32,  -564448 / 32,  -548576 / 32,  -532448 / 32,
+     -516064 / 32,  -499424 / 32,  -482528 / 32,  -465376 / 32,
+     -447968 / 32,  -430304 / 32,  -412384 / 32,  -394208 / 32,
+     -375776 / 32,  -357088 / 32,  -338144 / 32,  -318944 / 32,
+     -299488 / 32,  -279776 / 32,  -259808 / 32,  -239584 / 32,
+     -219104 / 32,  -198368 / 32,  -177376 / 32,  -156128 / 32,
+     -134624 / 32,  -112864 / 32,   -90848 / 32,   -68576 / 32,
+      -46048 / 32,   -23264 / 32,     -224 / 32,    23072 / 32,
+       46624 / 32,    70432 / 32,    94496 / 32,   118816 / 32,
+      143392 / 32,   168224 / 32,   193312 / 32,   218656 / 32,
+      244256 / 32,   270112 / 32,   296224 / 32,   322592 / 32,
+      349216 / 32,   376096 / 32,   403232 / 32,   430624 / 32,
+      458272 / 32,   486176 / 32,   514336 / 32,   542752 / 32,
+      571424 / 32,   600352 / 32,   629536 / 32,   658976 / 32,
+      688672 / 32,   718624 / 32,   748832 / 32,   779296 / 32,
+      810016 / 32,   840992 / 32,   872224 / 32,   903712 / 32,
+      935456 / 32,   967456 / 32,   999712 / 32,  1032224 / 32
+};
+
+
+/** Gain values of p(0) for long-term prediction.
+ *  To be indexed by the Rice coded indices.
+ */
+static const uint8_t ltp_gain_values [4][4] = {
+    { 0,  8, 16,  24},
+    {32, 40, 48,  56},
+    {64, 70, 76,  82},
+    {88, 92, 96, 100}
+};
+
 
 enum RA_Flag {
     RA_FLAG_NONE,