author | sheepluva |
Mon, 26 Sep 2011 03:12:09 +0200 | |
changeset 6038 | 58d9badf3e7f |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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* * |
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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* * |
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
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* * |
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******************************************************************** |
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function: normalized modified discrete cosine transform |
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power of two length transform only [64 <= n ] |
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last mod: $Id: mdct.c,v 1.9 2002/10/16 09:17:39 xiphmont Exp $ |
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Original algorithm adapted long ago from _The use of multirate filter |
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banks for coding of high quality digital audio_, by T. Sporer, |
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K. Brandenburg and B. Edler, collection of the European Signal |
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Processing Conference (EUSIPCO), Amsterdam, June 1992, Vol.1, pp |
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211-214 |
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The below code implements an algorithm that no longer looks much like |
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that presented in the paper, but the basic structure remains if you |
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dig deep enough to see it. |
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This module DOES NOT INCLUDE code to generate/apply the window |
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function. Everybody has their own weird favorite including me... I |
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happen to like the properties of y=sin(.5PI*sin^2(x)), but others may |
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vehemently disagree. |
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********************************************************************/ |
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#include "ivorbiscodec.h" |
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#include "codebook.h" |
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#include "misc.h" |
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#include "mdct.h" |
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#include "mdct_lookup.h" |
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/* 8 point butterfly (in place) */ |
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STIN void mdct_butterfly_8(DATA_TYPE *x){ |
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REG_TYPE r0 = x[4] + x[0]; |
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REG_TYPE r1 = x[4] - x[0]; |
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REG_TYPE r2 = x[5] + x[1]; |
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REG_TYPE r3 = x[5] - x[1]; |
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REG_TYPE r4 = x[6] + x[2]; |
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REG_TYPE r5 = x[6] - x[2]; |
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REG_TYPE r6 = x[7] + x[3]; |
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REG_TYPE r7 = x[7] - x[3]; |
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x[0] = r5 + r3; |
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x[1] = r7 - r1; |
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x[2] = r5 - r3; |
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x[3] = r7 + r1; |
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x[4] = r4 - r0; |
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x[5] = r6 - r2; |
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x[6] = r4 + r0; |
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x[7] = r6 + r2; |
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MB(); |
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} |
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/* 16 point butterfly (in place, 4 register) */ |
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STIN void mdct_butterfly_16(DATA_TYPE *x){ |
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REG_TYPE r0, r1; |
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r0 = x[ 0] - x[ 8]; x[ 8] += x[ 0]; |
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r1 = x[ 1] - x[ 9]; x[ 9] += x[ 1]; |
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x[ 0] = MULT31((r0 + r1) , cPI2_8); |
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x[ 1] = MULT31((r1 - r0) , cPI2_8); |
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MB(); |
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r0 = x[10] - x[ 2]; x[10] += x[ 2]; |
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r1 = x[ 3] - x[11]; x[11] += x[ 3]; |
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x[ 2] = r1; x[ 3] = r0; |
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MB(); |
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r0 = x[12] - x[ 4]; x[12] += x[ 4]; |
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r1 = x[13] - x[ 5]; x[13] += x[ 5]; |
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x[ 4] = MULT31((r0 - r1) , cPI2_8); |
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x[ 5] = MULT31((r0 + r1) , cPI2_8); |
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MB(); |
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r0 = x[14] - x[ 6]; x[14] += x[ 6]; |
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r1 = x[15] - x[ 7]; x[15] += x[ 7]; |
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x[ 6] = r0; x[ 7] = r1; |
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MB(); |
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mdct_butterfly_8(x); |
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mdct_butterfly_8(x+8); |
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} |
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/* 32 point butterfly (in place, 4 register) */ |
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STIN void mdct_butterfly_32(DATA_TYPE *x){ |
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REG_TYPE r0, r1; |
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r0 = x[30] - x[14]; x[30] += x[14]; |
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r1 = x[31] - x[15]; x[31] += x[15]; |
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x[14] = r0; x[15] = r1; |
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MB(); |
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r0 = x[28] - x[12]; x[28] += x[12]; |
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r1 = x[29] - x[13]; x[29] += x[13]; |
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XNPROD31( r0, r1, cPI1_8, cPI3_8, &x[12], &x[13] ); |
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MB(); |
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r0 = x[26] - x[10]; x[26] += x[10]; |
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r1 = x[27] - x[11]; x[27] += x[11]; |
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x[10] = MULT31((r0 - r1) , cPI2_8); |
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x[11] = MULT31((r0 + r1) , cPI2_8); |
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MB(); |
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r0 = x[24] - x[ 8]; x[24] += x[ 8]; |
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118 |
r1 = x[25] - x[ 9]; x[25] += x[ 9]; |
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119 |
XNPROD31( r0, r1, cPI3_8, cPI1_8, &x[ 8], &x[ 9] ); |
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120 |
MB(); |
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121 |
|
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122 |
r0 = x[22] - x[ 6]; x[22] += x[ 6]; |
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123 |
r1 = x[ 7] - x[23]; x[23] += x[ 7]; |
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124 |
x[ 6] = r1; x[ 7] = r0; |
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125 |
MB(); |
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126 |
|
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127 |
r0 = x[ 4] - x[20]; x[20] += x[ 4]; |
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128 |
r1 = x[ 5] - x[21]; x[21] += x[ 5]; |
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129 |
XPROD31 ( r0, r1, cPI3_8, cPI1_8, &x[ 4], &x[ 5] ); |
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130 |
MB(); |
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131 |
|
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132 |
r0 = x[ 2] - x[18]; x[18] += x[ 2]; |
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133 |
r1 = x[ 3] - x[19]; x[19] += x[ 3]; |
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134 |
x[ 2] = MULT31((r1 + r0) , cPI2_8); |
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135 |
x[ 3] = MULT31((r1 - r0) , cPI2_8); |
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136 |
MB(); |
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137 |
|
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138 |
r0 = x[ 0] - x[16]; x[16] += x[ 0]; |
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139 |
r1 = x[ 1] - x[17]; x[17] += x[ 1]; |
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140 |
XPROD31 ( r0, r1, cPI1_8, cPI3_8, &x[ 0], &x[ 1] ); |
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141 |
MB(); |
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142 |
|
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143 |
mdct_butterfly_16(x); |
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144 |
mdct_butterfly_16(x+16); |
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145 |
} |
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146 |
|
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147 |
/* N/stage point generic N stage butterfly (in place, 2 register) */ |
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148 |
STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){ |
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149 |
|
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150 |
LOOKUP_T *T = sincos_lookup0; |
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151 |
DATA_TYPE *x1 = x + points - 8; |
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152 |
DATA_TYPE *x2 = x + (points>>1) - 8; |
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153 |
REG_TYPE r0; |
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154 |
REG_TYPE r1; |
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155 |
|
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156 |
do{ |
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157 |
r0 = x1[6] - x2[6]; x1[6] += x2[6]; |
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158 |
r1 = x2[7] - x1[7]; x1[7] += x2[7]; |
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|
159 |
XPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T+=step; |
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|
160 |
|
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161 |
r0 = x1[4] - x2[4]; x1[4] += x2[4]; |
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162 |
r1 = x2[5] - x1[5]; x1[5] += x2[5]; |
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|
163 |
XPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T+=step; |
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|
164 |
|
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165 |
r0 = x1[2] - x2[2]; x1[2] += x2[2]; |
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166 |
r1 = x2[3] - x1[3]; x1[3] += x2[3]; |
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|
167 |
XPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T+=step; |
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|
168 |
|
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|
169 |
r0 = x1[0] - x2[0]; x1[0] += x2[0]; |
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170 |
r1 = x2[1] - x1[1]; x1[1] += x2[1]; |
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|
171 |
XPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T+=step; |
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|
172 |
|
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173 |
x1-=8; x2-=8; |
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|
174 |
}while(T<sincos_lookup0+1024); |
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|
175 |
do{ |
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|
176 |
r0 = x1[6] - x2[6]; x1[6] += x2[6]; |
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|
177 |
r1 = x1[7] - x2[7]; x1[7] += x2[7]; |
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|
178 |
XNPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T-=step; |
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|
179 |
|
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|
180 |
r0 = x1[4] - x2[4]; x1[4] += x2[4]; |
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|
181 |
r1 = x1[5] - x2[5]; x1[5] += x2[5]; |
f7e49eff3708
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|
182 |
XNPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T-=step; |
f7e49eff3708
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|
183 |
|
f7e49eff3708
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|
184 |
r0 = x1[2] - x2[2]; x1[2] += x2[2]; |
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|
185 |
r1 = x1[3] - x2[3]; x1[3] += x2[3]; |
f7e49eff3708
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koda
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|
186 |
XNPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T-=step; |
f7e49eff3708
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|
187 |
|
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|
188 |
r0 = x1[0] - x2[0]; x1[0] += x2[0]; |
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|
189 |
r1 = x1[1] - x2[1]; x1[1] += x2[1]; |
f7e49eff3708
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|
190 |
XNPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T-=step; |
f7e49eff3708
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|
191 |
|
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|
192 |
x1-=8; x2-=8; |
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|
193 |
}while(T>sincos_lookup0); |
f7e49eff3708
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|
194 |
do{ |
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|
195 |
r0 = x2[6] - x1[6]; x1[6] += x2[6]; |
f7e49eff3708
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|
196 |
r1 = x2[7] - x1[7]; x1[7] += x2[7]; |
f7e49eff3708
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|
197 |
XPROD31( r0, r1, T[0], T[1], &x2[6], &x2[7] ); T+=step; |
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|
198 |
|
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|
199 |
r0 = x2[4] - x1[4]; x1[4] += x2[4]; |
f7e49eff3708
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|
200 |
r1 = x2[5] - x1[5]; x1[5] += x2[5]; |
f7e49eff3708
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changeset
|
201 |
XPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T+=step; |
f7e49eff3708
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|
202 |
|
f7e49eff3708
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|
203 |
r0 = x2[2] - x1[2]; x1[2] += x2[2]; |
f7e49eff3708
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|
204 |
r1 = x2[3] - x1[3]; x1[3] += x2[3]; |
f7e49eff3708
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|
205 |
XPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T+=step; |
f7e49eff3708
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|
206 |
|
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|
207 |
r0 = x2[0] - x1[0]; x1[0] += x2[0]; |
f7e49eff3708
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|
208 |
r1 = x2[1] - x1[1]; x1[1] += x2[1]; |
f7e49eff3708
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|
209 |
XPROD31( r0, r1, T[0], T[1], &x2[0], &x2[1] ); T+=step; |
f7e49eff3708
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|
210 |
|
f7e49eff3708
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|
211 |
x1-=8; x2-=8; |
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|
212 |
}while(T<sincos_lookup0+1024); |
f7e49eff3708
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|
213 |
do{ |
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|
214 |
r0 = x1[6] - x2[6]; x1[6] += x2[6]; |
f7e49eff3708
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|
215 |
r1 = x2[7] - x1[7]; x1[7] += x2[7]; |
f7e49eff3708
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diff
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|
216 |
XNPROD31( r1, r0, T[0], T[1], &x2[6], &x2[7] ); T-=step; |
f7e49eff3708
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|
217 |
|
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218 |
r0 = x1[4] - x2[4]; x1[4] += x2[4]; |
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|
219 |
r1 = x2[5] - x1[5]; x1[5] += x2[5]; |
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220 |
XNPROD31( r1, r0, T[0], T[1], &x2[4], &x2[5] ); T-=step; |
f7e49eff3708
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|
221 |
|
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|
222 |
r0 = x1[2] - x2[2]; x1[2] += x2[2]; |
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223 |
r1 = x2[3] - x1[3]; x1[3] += x2[3]; |
f7e49eff3708
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|
224 |
XNPROD31( r1, r0, T[0], T[1], &x2[2], &x2[3] ); T-=step; |
f7e49eff3708
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|
225 |
|
f7e49eff3708
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|
226 |
r0 = x1[0] - x2[0]; x1[0] += x2[0]; |
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r1 = x2[1] - x1[1]; x1[1] += x2[1]; |
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XNPROD31( r1, r0, T[0], T[1], &x2[0], &x2[1] ); T-=step; |
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|
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x1-=8; x2-=8; |
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}while(T>sincos_lookup0); |
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} |
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|
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STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift){ |
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|
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int stages=8-shift; |
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int i,j; |
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|
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for(i=0;--stages>0;i++){ |
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for(j=0;j<(1<<i);j++) |
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mdct_butterfly_generic(x+(points>>i)*j,points>>i,4<<(i+shift)); |
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} |
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|
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for(j=0;j<points;j+=32) |
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mdct_butterfly_32(x+j); |
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|
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} |
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|
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static unsigned char bitrev[16]={0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15}; |
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|
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STIN int bitrev12(int x){ |
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return bitrev[x>>8]|(bitrev[(x&0x0f0)>>4]<<4)|(((int)bitrev[x&0x00f])<<8); |
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} |
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|
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STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){ |
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|
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int bit = 0; |
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DATA_TYPE *w0 = x; |
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DATA_TYPE *w1 = x = w0+(n>>1); |
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LOOKUP_T *T = (step>=4)?(sincos_lookup0+(step>>1)):sincos_lookup1; |
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LOOKUP_T *Ttop = T+1024; |
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DATA_TYPE r2; |
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|
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do{ |
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DATA_TYPE r3 = bitrev12(bit++); |
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DATA_TYPE *x0 = x + ((r3 ^ 0xfff)>>shift) -1; |
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DATA_TYPE *x1 = x + (r3>>shift); |
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|
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REG_TYPE r0 = x0[0] + x1[0]; |
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REG_TYPE r1 = x1[1] - x0[1]; |
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|
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XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step; |
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|
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w1 -= 4; |
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|
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r0 = (x0[1] + x1[1])>>1; |
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r1 = (x0[0] - x1[0])>>1; |
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w0[0] = r0 + r2; |
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w0[1] = r1 + r3; |
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w1[2] = r0 - r2; |
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w1[3] = r3 - r1; |
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282 |
|
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r3 = bitrev12(bit++); |
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x0 = x + ((r3 ^ 0xfff)>>shift) -1; |
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x1 = x + (r3>>shift); |
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286 |
|
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r0 = x0[0] + x1[0]; |
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r1 = x1[1] - x0[1]; |
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289 |
|
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XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step; |
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291 |
|
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r0 = (x0[1] + x1[1])>>1; |
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r1 = (x0[0] - x1[0])>>1; |
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w0[2] = r0 + r2; |
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w0[3] = r1 + r3; |
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296 |
w1[0] = r0 - r2; |
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w1[1] = r3 - r1; |
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298 |
|
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299 |
w0 += 4; |
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300 |
}while(T<Ttop); |
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301 |
do{ |
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302 |
DATA_TYPE r3 = bitrev12(bit++); |
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303 |
DATA_TYPE *x0 = x + ((r3 ^ 0xfff)>>shift) -1; |
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304 |
DATA_TYPE *x1 = x + (r3>>shift); |
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305 |
|
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306 |
REG_TYPE r0 = x0[0] + x1[0]; |
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307 |
REG_TYPE r1 = x1[1] - x0[1]; |
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308 |
|
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T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 ); |
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310 |
|
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311 |
w1 -= 4; |
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312 |
|
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313 |
r0 = (x0[1] + x1[1])>>1; |
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314 |
r1 = (x0[0] - x1[0])>>1; |
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315 |
w0[0] = r0 + r2; |
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316 |
w0[1] = r1 + r3; |
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317 |
w1[2] = r0 - r2; |
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w1[3] = r3 - r1; |
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319 |
|
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320 |
r3 = bitrev12(bit++); |
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321 |
x0 = x + ((r3 ^ 0xfff)>>shift) -1; |
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322 |
x1 = x + (r3>>shift); |
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323 |
|
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324 |
r0 = x0[0] + x1[0]; |
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325 |
r1 = x1[1] - x0[1]; |
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326 |
|
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327 |
T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 ); |
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|
328 |
|
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329 |
r0 = (x0[1] + x1[1])>>1; |
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330 |
r1 = (x0[0] - x1[0])>>1; |
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331 |
w0[2] = r0 + r2; |
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332 |
w0[3] = r1 + r3; |
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333 |
w1[0] = r0 - r2; |
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334 |
w1[1] = r3 - r1; |
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335 |
|
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336 |
w0 += 4; |
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337 |
}while(w0<w1); |
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338 |
} |
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339 |
|
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340 |
void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){ |
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int n2=n>>1; |
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342 |
int n4=n>>2; |
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343 |
DATA_TYPE *iX; |
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344 |
DATA_TYPE *oX; |
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diff
changeset
|
345 |
LOOKUP_T *T; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
346 |
LOOKUP_T *V; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
347 |
int shift; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
348 |
int step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
349 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
350 |
for (shift=6;!(n&(1<<shift));shift++); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
351 |
shift=13-shift; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
352 |
step=2<<shift; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
353 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
354 |
/* rotate */ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
355 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
356 |
iX = in+n2-7; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
357 |
oX = out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
358 |
T = sincos_lookup0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
359 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
360 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
361 |
oX-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
362 |
XPROD31( iX[4], iX[6], T[0], T[1], &oX[2], &oX[3] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
363 |
XPROD31( iX[0], iX[2], T[0], T[1], &oX[0], &oX[1] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
364 |
iX-=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
365 |
}while(iX>=in+n4); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
366 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
367 |
oX-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
368 |
XPROD31( iX[4], iX[6], T[1], T[0], &oX[2], &oX[3] ); T-=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
369 |
XPROD31( iX[0], iX[2], T[1], T[0], &oX[0], &oX[1] ); T-=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
370 |
iX-=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
371 |
}while(iX>=in); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
372 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
373 |
iX = in+n2-8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
374 |
oX = out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
375 |
T = sincos_lookup0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
376 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
377 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
378 |
T+=step; XNPROD31( iX[6], iX[4], T[0], T[1], &oX[0], &oX[1] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
379 |
T+=step; XNPROD31( iX[2], iX[0], T[0], T[1], &oX[2], &oX[3] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
380 |
iX-=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
381 |
oX+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
382 |
}while(iX>=in+n4); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
383 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
384 |
T-=step; XNPROD31( iX[6], iX[4], T[1], T[0], &oX[0], &oX[1] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
385 |
T-=step; XNPROD31( iX[2], iX[0], T[1], T[0], &oX[2], &oX[3] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
386 |
iX-=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
387 |
oX+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
388 |
}while(iX>=in); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
389 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
390 |
mdct_butterflies(out+n2,n2,shift); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
391 |
mdct_bitreverse(out,n,step,shift); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
392 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
393 |
/* rotate + window */ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
394 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
395 |
step>>=2; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
396 |
{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
397 |
DATA_TYPE *oX1=out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
398 |
DATA_TYPE *oX2=out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
399 |
DATA_TYPE *iX =out; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
400 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
401 |
switch(step) { |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
402 |
default: { |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
403 |
T=(step>=4)?(sincos_lookup0+(step>>1)):sincos_lookup1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
404 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
405 |
oX1-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
406 |
XPROD31( iX[0], -iX[1], T[0], T[1], &oX1[3], &oX2[0] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
407 |
XPROD31( iX[2], -iX[3], T[0], T[1], &oX1[2], &oX2[1] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
408 |
XPROD31( iX[4], -iX[5], T[0], T[1], &oX1[1], &oX2[2] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
409 |
XPROD31( iX[6], -iX[7], T[0], T[1], &oX1[0], &oX2[3] ); T+=step; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
410 |
oX2+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
411 |
iX+=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
412 |
}while(iX<oX1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
413 |
break; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
414 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
415 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
416 |
case 1: { |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
417 |
/* linear interpolation between table values: offset=0.5, step=1 */ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
418 |
REG_TYPE t0,t1,v0,v1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
419 |
T = sincos_lookup0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
420 |
V = sincos_lookup1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
421 |
t0 = (*T++)>>1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
422 |
t1 = (*T++)>>1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
423 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
424 |
oX1-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
425 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
426 |
t0 += (v0 = (*V++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
427 |
t1 += (v1 = (*V++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
428 |
XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
429 |
v0 += (t0 = (*T++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
430 |
v1 += (t1 = (*T++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
431 |
XPROD31( iX[2], -iX[3], v0, v1, &oX1[2], &oX2[1] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
432 |
t0 += (v0 = (*V++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
433 |
t1 += (v1 = (*V++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
434 |
XPROD31( iX[4], -iX[5], t0, t1, &oX1[1], &oX2[2] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
435 |
v0 += (t0 = (*T++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
436 |
v1 += (t1 = (*T++)>>1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
437 |
XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
438 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
439 |
oX2+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
440 |
iX+=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
441 |
}while(iX<oX1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
442 |
break; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
443 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
444 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
445 |
case 0: { |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
446 |
/* linear interpolation between table values: offset=0.25, step=0.5 */ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
447 |
REG_TYPE t0,t1,v0,v1,q0,q1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
448 |
T = sincos_lookup0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
449 |
V = sincos_lookup1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
450 |
t0 = *T++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
451 |
t1 = *T++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
452 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
453 |
oX1-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
454 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
455 |
v0 = *V++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
456 |
v1 = *V++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
457 |
t0 += (q0 = (v0-t0)>>2); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
458 |
t1 += (q1 = (v1-t1)>>2); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
459 |
XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
460 |
t0 = v0-q0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
461 |
t1 = v1-q1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
462 |
XPROD31( iX[2], -iX[3], t0, t1, &oX1[2], &oX2[1] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
463 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
464 |
t0 = *T++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
465 |
t1 = *T++; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
466 |
v0 += (q0 = (t0-v0)>>2); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
467 |
v1 += (q1 = (t1-v1)>>2); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
468 |
XPROD31( iX[4], -iX[5], v0, v1, &oX1[1], &oX2[2] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
469 |
v0 = t0-q0; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
470 |
v1 = t1-q1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
471 |
XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
472 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
473 |
oX2+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
474 |
iX+=8; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
475 |
}while(iX<oX1); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
476 |
break; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
477 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
478 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
479 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
480 |
iX=out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
481 |
oX1=out+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
482 |
oX2=oX1; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
483 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
484 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
485 |
oX1-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
486 |
iX-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
487 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
488 |
oX2[0] = -(oX1[3] = iX[3]); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
489 |
oX2[1] = -(oX1[2] = iX[2]); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
490 |
oX2[2] = -(oX1[1] = iX[1]); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
491 |
oX2[3] = -(oX1[0] = iX[0]); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
492 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
493 |
oX2+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
494 |
}while(oX2<iX); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
495 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
496 |
iX=out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
497 |
oX1=out+n2+n4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
498 |
oX2=out+n2; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
499 |
|
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
500 |
do{ |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
501 |
oX1-=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
502 |
oX1[0]= iX[3]; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
503 |
oX1[1]= iX[2]; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
504 |
oX1[2]= iX[1]; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
505 |
oX1[3]= iX[0]; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
506 |
iX+=4; |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
507 |
}while(oX1>oX2); |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
508 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
509 |
} |
f7e49eff3708
add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff
changeset
|
510 |