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+/*
+ * libmad - MPEG audio decoder library
+ * Copyright (C) 2000-2003 Underbit Technologies, Inc.
+ *
+ * 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
+ *
+ * $Id: synth.c,v 1.1 2003/08/14 03:57:13 shank Exp $
+ */
+
+# ifdef HAVE_CONFIG_H
+# include "config.h"
+# endif
+
+# include "global.h"
+
+# include "fixed.h"
+# include "frame.h"
+# include "synth.h"
+
+/*
+ * NAME: synth->init()
+ * DESCRIPTION: initialize synth struct
+ */
+void mad_synth_init(struct mad_synth *synth)
+{
+ mad_synth_mute(synth);
+
+ synth->phase = 0;
+
+ synth->pcm.samplerate = 0;
+ synth->pcm.channels = 0;
+ synth->pcm.length = 0;
+}
+
+/*
+ * NAME: synth->mute()
+ * DESCRIPTION: zero all polyphase filterbank values, resetting synthesis
+ */
+void mad_synth_mute(struct mad_synth *synth)
+{
+ unsigned int ch, s, v;
+
+ for (ch = 0; ch < 2; ++ch) {
+ for (s = 0; s < 16; ++s) {
+ for (v = 0; v < 8; ++v) {
+ synth->filter[ch][0][0][s][v] = synth->filter[ch][0][1][s][v] =
+ synth->filter[ch][1][0][s][v] = synth->filter[ch][1][1][s][v] = 0;
+ }
+ }
+ }
+}
+
+/*
+ * An optional optimization called here the Subband Synthesis Optimization
+ * (SSO) improves the performance of subband synthesis at the expense of
+ * accuracy.
+ *
+ * The idea is to simplify 32x32->64-bit multiplication to 32x32->32 such
+ * that extra scaling and rounding are not necessary. This often allows the
+ * compiler to use faster 32-bit multiply-accumulate instructions instead of
+ * explicit 64-bit multiply, shift, and add instructions.
+ *
+ * SSO works like this: a full 32x32->64-bit multiply of two mad_fixed_t
+ * values requires the result to be right-shifted 28 bits to be properly
+ * scaled to the same fixed-point format. Right shifts can be applied at any
+ * time to either operand or to the result, so the optimization involves
+ * careful placement of these shifts to minimize the loss of accuracy.
+ *
+ * First, a 14-bit shift is applied with rounding at compile-time to the D[]
+ * table of coefficients for the subband synthesis window. This only loses 2
+ * bits of accuracy because the lower 12 bits are always zero. A second
+ * 12-bit shift occurs after the DCT calculation. This loses 12 bits of
+ * accuracy. Finally, a third 2-bit shift occurs just before the sample is
+ * saved in the PCM buffer. 14 + 12 + 2 == 28 bits.
+ */
+
+/* FPM_DEFAULT without OPT_SSO will actually lose accuracy and performance */
+
+# if defined(FPM_DEFAULT) && !defined(OPT_SSO)
+# define OPT_SSO
+# endif
+
+/* second SSO shift, with rounding */
+
+# if defined(OPT_SSO)
+# define SHIFT(x) (((x) + (1L << 11)) >> 12)
+# else
+# define SHIFT(x) (x)
+# endif
+
+/* possible DCT speed optimization */
+
+# if defined(OPT_SPEED) && defined(MAD_F_MLX)
+# define OPT_DCTO
+# define MUL(x, y) \
+ ({ mad_fixed64hi_t hi; \
+ mad_fixed64lo_t lo; \
+ MAD_F_MLX(hi, lo, (x), (y)); \
+ hi << (32 - MAD_F_SCALEBITS - 3); \
+ })
+# else
+# undef OPT_DCTO
+# define MUL(x, y) mad_f_mul((x), (y))
+# endif
+
+/*
+ * NAME: dct32()
+ * DESCRIPTION: perform fast in[32]->out[32] DCT
+ */
+static
+void dct32(mad_fixed_t const in[32], unsigned int slot,
+ mad_fixed_t lo[16][8], mad_fixed_t hi[16][8])
+{
+ mad_fixed_t t0, t1, t2, t3, t4, t5, t6, t7;
+ mad_fixed_t t8, t9, t10, t11, t12, t13, t14, t15;
+ mad_fixed_t t16, t17, t18, t19, t20, t21, t22, t23;
+ mad_fixed_t t24, t25, t26, t27, t28, t29, t30, t31;
+ mad_fixed_t t32, t33, t34, t35, t36, t37, t38, t39;
+ mad_fixed_t t40, t41, t42, t43, t44, t45, t46, t47;
+ mad_fixed_t t48, t49, t50, t51, t52, t53, t54, t55;
+ mad_fixed_t t56, t57, t58, t59, t60, t61, t62, t63;
+ mad_fixed_t t64, t65, t66, t67, t68, t69, t70, t71;
+ mad_fixed_t t72, t73, t74, t75, t76, t77, t78, t79;
+ mad_fixed_t t80, t81, t82, t83, t84, t85, t86, t87;
+ mad_fixed_t t88, t89, t90, t91, t92, t93, t94, t95;
+ mad_fixed_t t96, t97, t98, t99, t100, t101, t102, t103;
+ mad_fixed_t t104, t105, t106, t107, t108, t109, t110, t111;
+ mad_fixed_t t112, t113, t114, t115, t116, t117, t118, t119;
+ mad_fixed_t t120, t121, t122, t123, t124, t125, t126, t127;
+ mad_fixed_t t128, t129, t130, t131, t132, t133, t134, t135;
+ mad_fixed_t t136, t137, t138, t139, t140, t141, t142, t143;
+ mad_fixed_t t144, t145, t146, t147, t148, t149, t150, t151;
+ mad_fixed_t t152, t153, t154, t155, t156, t157, t158, t159;
+ mad_fixed_t t160, t161, t162, t163, t164, t165, t166, t167;
+ mad_fixed_t t168, t169, t170, t171, t172, t173, t174, t175;
+ mad_fixed_t t176;
+
+ /* costab[i] = cos(PI / (2 * 32) * i) */
+
+# if defined(OPT_DCTO)
+# define costab1 MAD_F(0x7fd8878e)
+# define costab2 MAD_F(0x7f62368f)
+# define costab3 MAD_F(0x7e9d55fc)
+# define costab4 MAD_F(0x7d8a5f40)
+# define costab5 MAD_F(0x7c29fbee)
+# define costab6 MAD_F(0x7a7d055b)
+# define costab7 MAD_F(0x78848414)
+# define costab8 MAD_F(0x7641af3d)
+# define costab9 MAD_F(0x73b5ebd1)
+# define costab10 MAD_F(0x70e2cbc6)
+# define costab11 MAD_F(0x6dca0d14)
+# define costab12 MAD_F(0x6a6d98a4)
+# define costab13 MAD_F(0x66cf8120)
+# define costab14 MAD_F(0x62f201ac)
+# define costab15 MAD_F(0x5ed77c8a)
+# define costab16 MAD_F(0x5a82799a)
+# define costab17 MAD_F(0x55f5a4d2)
+# define costab18 MAD_F(0x5133cc94)
+# define costab19 MAD_F(0x4c3fdff4)
+# define costab20 MAD_F(0x471cece7)
+# define costab21 MAD_F(0x41ce1e65)
+# define costab22 MAD_F(0x3c56ba70)
+# define costab23 MAD_F(0x36ba2014)
+# define costab24 MAD_F(0x30fbc54d)
+# define costab25 MAD_F(0x2b1f34eb)
+# define costab26 MAD_F(0x25280c5e)
+# define costab27 MAD_F(0x1f19f97b)
+# define costab28 MAD_F(0x18f8b83c)
+# define costab29 MAD_F(0x12c8106f)
+# define costab30 MAD_F(0x0c8bd35e)
+# define costab31 MAD_F(0x0647d97c)
+# else
+# define costab1 MAD_F(0x0ffb10f2) /* 0.998795456 */
+# define costab2 MAD_F(0x0fec46d2) /* 0.995184727 */
+# define costab3 MAD_F(0x0fd3aac0) /* 0.989176510 */
+# define costab4 MAD_F(0x0fb14be8) /* 0.980785280 */
+# define costab5 MAD_F(0x0f853f7e) /* 0.970031253 */
+# define costab6 MAD_F(0x0f4fa0ab) /* 0.956940336 */
+# define costab7 MAD_F(0x0f109082) /* 0.941544065 */
+# define costab8 MAD_F(0x0ec835e8) /* 0.923879533 */
+# define costab9 MAD_F(0x0e76bd7a) /* 0.903989293 */
+# define costab10 MAD_F(0x0e1c5979) /* 0.881921264 */
+# define costab11 MAD_F(0x0db941a3) /* 0.857728610 */
+# define costab12 MAD_F(0x0d4db315) /* 0.831469612 */
+# define costab13 MAD_F(0x0cd9f024) /* 0.803207531 */
+# define costab14 MAD_F(0x0c5e4036) /* 0.773010453 */
+# define costab15 MAD_F(0x0bdaef91) /* 0.740951125 */
+# define costab16 MAD_F(0x0b504f33) /* 0.707106781 */
+# define costab17 MAD_F(0x0abeb49a) /* 0.671558955 */
+# define costab18 MAD_F(0x0a267993) /* 0.634393284 */
+# define costab19 MAD_F(0x0987fbfe) /* 0.595699304 */
+# define costab20 MAD_F(0x08e39d9d) /* 0.555570233 */
+# define costab21 MAD_F(0x0839c3cd) /* 0.514102744 */
+# define costab22 MAD_F(0x078ad74e) /* 0.471396737 */
+# define costab23 MAD_F(0x06d74402) /* 0.427555093 */
+# define costab24 MAD_F(0x061f78aa) /* 0.382683432 */
+# define costab25 MAD_F(0x0563e69d) /* 0.336889853 */
+# define costab26 MAD_F(0x04a5018c) /* 0.290284677 */
+# define costab27 MAD_F(0x03e33f2f) /* 0.242980180 */
+# define costab28 MAD_F(0x031f1708) /* 0.195090322 */
+# define costab29 MAD_F(0x0259020e) /* 0.146730474 */
+# define costab30 MAD_F(0x01917a6c) /* 0.098017140 */
+# define costab31 MAD_F(0x00c8fb30) /* 0.049067674 */
+# endif
+
+ t0 = in[0] + in[31]; t16 = MUL(in[0] - in[31], costab1);
+ t1 = in[15] + in[16]; t17 = MUL(in[15] - in[16], costab31);
+
+ t41 = t16 + t17;
+ t59 = MUL(t16 - t17, costab2);
+ t33 = t0 + t1;
+ t50 = MUL(t0 - t1, costab2);
+
+ t2 = in[7] + in[24]; t18 = MUL(in[7] - in[24], costab15);
+ t3 = in[8] + in[23]; t19 = MUL(in[8] - in[23], costab17);
+
+ t42 = t18 + t19;
+ t60 = MUL(t18 - t19, costab30);
+ t34 = t2 + t3;
+ t51 = MUL(t2 - t3, costab30);
+
+ t4 = in[3] + in[28]; t20 = MUL(in[3] - in[28], costab7);
+ t5 = in[12] + in[19]; t21 = MUL(in[12] - in[19], costab25);
+
+ t43 = t20 + t21;
+ t61 = MUL(t20 - t21, costab14);
+ t35 = t4 + t5;
+ t52 = MUL(t4 - t5, costab14);
+
+ t6 = in[4] + in[27]; t22 = MUL(in[4] - in[27], costab9);
+ t7 = in[11] + in[20]; t23 = MUL(in[11] - in[20], costab23);
+
+ t44 = t22 + t23;
+ t62 = MUL(t22 - t23, costab18);
+ t36 = t6 + t7;
+ t53 = MUL(t6 - t7, costab18);
+
+ t8 = in[1] + in[30]; t24 = MUL(in[1] - in[30], costab3);
+ t9 = in[14] + in[17]; t25 = MUL(in[14] - in[17], costab29);
+
+ t45 = t24 + t25;
+ t63 = MUL(t24 - t25, costab6);
+ t37 = t8 + t9;
+ t54 = MUL(t8 - t9, costab6);
+
+ t10 = in[6] + in[25]; t26 = MUL(in[6] - in[25], costab13);
+ t11 = in[9] + in[22]; t27 = MUL(in[9] - in[22], costab19);
+
+ t46 = t26 + t27;
+ t64 = MUL(t26 - t27, costab26);
+ t38 = t10 + t11;
+ t55 = MUL(t10 - t11, costab26);
+
+ t12 = in[2] + in[29]; t28 = MUL(in[2] - in[29], costab5);
+ t13 = in[13] + in[18]; t29 = MUL(in[13] - in[18], costab27);
+
+ t47 = t28 + t29;
+ t65 = MUL(t28 - t29, costab10);
+ t39 = t12 + t13;
+ t56 = MUL(t12 - t13, costab10);
+
+ t14 = in[5] + in[26]; t30 = MUL(in[5] - in[26], costab11);
+ t15 = in[10] + in[21]; t31 = MUL(in[10] - in[21], costab21);
+
+ t48 = t30 + t31;
+ t66 = MUL(t30 - t31, costab22);
+ t40 = t14 + t15;
+ t57 = MUL(t14 - t15, costab22);
+
+ t69 = t33 + t34; t89 = MUL(t33 - t34, costab4);
+ t70 = t35 + t36; t90 = MUL(t35 - t36, costab28);
+ t71 = t37 + t38; t91 = MUL(t37 - t38, costab12);
+ t72 = t39 + t40; t92 = MUL(t39 - t40, costab20);
+ t73 = t41 + t42; t94 = MUL(t41 - t42, costab4);
+ t74 = t43 + t44; t95 = MUL(t43 - t44, costab28);
+ t75 = t45 + t46; t96 = MUL(t45 - t46, costab12);
+ t76 = t47 + t48; t97 = MUL(t47 - t48, costab20);
+
+ t78 = t50 + t51; t100 = MUL(t50 - t51, costab4);
+ t79 = t52 + t53; t101 = MUL(t52 - t53, costab28);
+ t80 = t54 + t55; t102 = MUL(t54 - t55, costab12);
+ t81 = t56 + t57; t103 = MUL(t56 - t57, costab20);
+
+ t83 = t59 + t60; t106 = MUL(t59 - t60, costab4);
+ t84 = t61 + t62; t107 = MUL(t61 - t62, costab28);
+ t85 = t63 + t64; t108 = MUL(t63 - t64, costab12);
+ t86 = t65 + t66; t109 = MUL(t65 - t66, costab20);
+
+ t113 = t69 + t70;
+ t114 = t71 + t72;
+
+ /* 0 */ hi[15][slot] = SHIFT(t113 + t114);
+ /* 16 */ lo[ 0][slot] = SHIFT(MUL(t113 - t114, costab16));
+
+ t115 = t73 + t74;
+ t116 = t75 + t76;
+
+ t32 = t115 + t116;
+
+ /* 1 */ hi[14][slot] = SHIFT(t32);
+
+ t118 = t78 + t79;
+ t119 = t80 + t81;
+
+ t58 = t118 + t119;
+
+ /* 2 */ hi[13][slot] = SHIFT(t58);
+
+ t121 = t83 + t84;
+ t122 = t85 + t86;
+
+ t67 = t121 + t122;
+
+ t49 = (t67 * 2) - t32;
+
+ /* 3 */ hi[12][slot] = SHIFT(t49);
+
+ t125 = t89 + t90;
+ t126 = t91 + t92;
+
+ t93 = t125 + t126;
+
+ /* 4 */ hi[11][slot] = SHIFT(t93);
+
+ t128 = t94 + t95;
+ t129 = t96 + t97;
+
+ t98 = t128 + t129;
+
+ t68 = (t98 * 2) - t49;
+
+ /* 5 */ hi[10][slot] = SHIFT(t68);
+
+ t132 = t100 + t101;
+ t133 = t102 + t103;
+
+ t104 = t132 + t133;
+
+ t82 = (t104 * 2) - t58;
+
+ /* 6 */ hi[ 9][slot] = SHIFT(t82);
+
+ t136 = t106 + t107;
+ t137 = t108 + t109;
+
+ t110 = t136 + t137;
+
+ t87 = (t110 * 2) - t67;
+
+ t77 = (t87 * 2) - t68;
+
+ /* 7 */ hi[ 8][slot] = SHIFT(t77);
+
+ t141 = MUL(t69 - t70, costab8);
+ t142 = MUL(t71 - t72, costab24);
+ t143 = t141 + t142;
+
+ /* 8 */ hi[ 7][slot] = SHIFT(t143);
+ /* 24 */ lo[ 8][slot] =
+ SHIFT((MUL(t141 - t142, costab16) * 2) - t143);
+
+ t144 = MUL(t73 - t74, costab8);
+ t145 = MUL(t75 - t76, costab24);
+ t146 = t144 + t145;
+
+ t88 = (t146 * 2) - t77;
+
+ /* 9 */ hi[ 6][slot] = SHIFT(t88);
+
+ t148 = MUL(t78 - t79, costab8);
+ t149 = MUL(t80 - t81, costab24);
+ t150 = t148 + t149;
+
+ t105 = (t150 * 2) - t82;
+
+ /* 10 */ hi[ 5][slot] = SHIFT(t105);
+
+ t152 = MUL(t83 - t84, costab8);
+ t153 = MUL(t85 - t86, costab24);
+ t154 = t152 + t153;
+
+ t111 = (t154 * 2) - t87;
+
+ t99 = (t111 * 2) - t88;
+
+ /* 11 */ hi[ 4][slot] = SHIFT(t99);
+
+ t157 = MUL(t89 - t90, costab8);
+ t158 = MUL(t91 - t92, costab24);
+ t159 = t157 + t158;
+
+ t127 = (t159 * 2) - t93;
+
+ /* 12 */ hi[ 3][slot] = SHIFT(t127);
+
+ t160 = (MUL(t125 - t126, costab16) * 2) - t127;
+
+ /* 20 */ lo[ 4][slot] = SHIFT(t160);
+ /* 28 */ lo[12][slot] =
+ SHIFT((((MUL(t157 - t158, costab16) * 2) - t159) * 2) - t160);
+
+ t161 = MUL(t94 - t95, costab8);
+ t162 = MUL(t96 - t97, costab24);
+ t163 = t161 + t162;
+
+ t130 = (t163 * 2) - t98;
+
+ t112 = (t130 * 2) - t99;
+
+ /* 13 */ hi[ 2][slot] = SHIFT(t112);
+
+ t164 = (MUL(t128 - t129, costab16) * 2) - t130;
+
+ t166 = MUL(t100 - t101, costab8);
+ t167 = MUL(t102 - t103, costab24);
+ t168 = t166 + t167;
+
+ t134 = (t168 * 2) - t104;
+
+ t120 = (t134 * 2) - t105;
+
+ /* 14 */ hi[ 1][slot] = SHIFT(t120);
+
+ t135 = (MUL(t118 - t119, costab16) * 2) - t120;
+
+ /* 18 */ lo[ 2][slot] = SHIFT(t135);
+
+ t169 = (MUL(t132 - t133, costab16) * 2) - t134;
+
+ t151 = (t169 * 2) - t135;
+
+ /* 22 */ lo[ 6][slot] = SHIFT(t151);
+
+ t170 = (((MUL(t148 - t149, costab16) * 2) - t150) * 2) - t151;
+
+ /* 26 */ lo[10][slot] = SHIFT(t170);
+ /* 30 */ lo[14][slot] =
+ SHIFT((((((MUL(t166 - t167, costab16) * 2) -
+ t168) * 2) - t169) * 2) - t170);
+
+ t171 = MUL(t106 - t107, costab8);
+ t172 = MUL(t108 - t109, costab24);
+ t173 = t171 + t172;
+
+ t138 = (t173 * 2) - t110;
+
+ t123 = (t138 * 2) - t111;
+
+ t139 = (MUL(t121 - t122, costab16) * 2) - t123;
+
+ t117 = (t123 * 2) - t112;
+
+ /* 15 */ hi[ 0][slot] = SHIFT(t117);
+
+ t124 = (MUL(t115 - t116, costab16) * 2) - t117;
+
+ /* 17 */ lo[ 1][slot] = SHIFT(t124);
+
+ t131 = (t139 * 2) - t124;
+
+ /* 19 */ lo[ 3][slot] = SHIFT(t131);
+
+ t140 = (t164 * 2) - t131;
+
+ /* 21 */ lo[ 5][slot] = SHIFT(t140);
+
+ t174 = (MUL(t136 - t137, costab16) * 2) - t138;
+
+ t155 = (t174 * 2) - t139;
+
+ t147 = (t155 * 2) - t140;
+
+ /* 23 */ lo[ 7][slot] = SHIFT(t147);
+
+ t156 = (((MUL(t144 - t145, costab16) * 2) - t146) * 2) - t147;
+
+ /* 25 */ lo[ 9][slot] = SHIFT(t156);
+
+ t175 = (((MUL(t152 - t153, costab16) * 2) - t154) * 2) - t155;
+
+ t165 = (t175 * 2) - t156;
+
+ /* 27 */ lo[11][slot] = SHIFT(t165);
+
+ t176 = (((((MUL(t161 - t162, costab16) * 2) -
+ t163) * 2) - t164) * 2) - t165;
+
+ /* 29 */ lo[13][slot] = SHIFT(t176);
+ /* 31 */ lo[15][slot] =
+ SHIFT((((((((MUL(t171 - t172, costab16) * 2) -
+ t173) * 2) - t174) * 2) - t175) * 2) - t176);
+
+ /*
+ * Totals:
+ * 80 multiplies
+ * 80 additions
+ * 119 subtractions
+ * 49 shifts (not counting SSO)
+ */
+}
+
+# undef MUL
+# undef SHIFT
+
+/* third SSO shift and/or D[] optimization preshift */
+
+# if defined(OPT_SSO)
+# if MAD_F_FRACBITS != 28
+# error "MAD_F_FRACBITS must be 28 to use OPT_SSO"
+# endif
+# define ML0(hi, lo, x, y) ((lo) = (x) * (y))
+# define MLA(hi, lo, x, y) ((lo) += (x) * (y))
+# define MLN(hi, lo) ((lo) = -(lo))
+# define MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
+# define SHIFT(x) ((x) >> 2)
+# define PRESHIFT(x) ((MAD_F(x) + (1L << 13)) >> 14)
+# else
+# define ML0(hi, lo, x, y) MAD_F_ML0((hi), (lo), (x), (y))
+# define MLA(hi, lo, x, y) MAD_F_MLA((hi), (lo), (x), (y))
+# define MLN(hi, lo) MAD_F_MLN((hi), (lo))
+# define MLZ(hi, lo) MAD_F_MLZ((hi), (lo))
+# define SHIFT(x) (x)
+# if defined(MAD_F_SCALEBITS)
+# undef MAD_F_SCALEBITS
+# define MAD_F_SCALEBITS (MAD_F_FRACBITS - 12)
+# define PRESHIFT(x) (MAD_F(x) >> 12)
+# else
+# define PRESHIFT(x) MAD_F(x)
+# endif
+# endif
+
+static
+mad_fixed_t const D[17][32] = {
+# include "D.dat"
+};
+
+# if defined(ASO_SYNTH)
+void synth_full(struct mad_synth *, struct mad_frame const *,
+ unsigned int, unsigned int);
+# else
+/*
+ * NAME: synth->full()
+ * DESCRIPTION: perform full frequency PCM synthesis
+ */
+static
+void synth_full(struct mad_synth *synth, struct mad_frame const *frame,
+ unsigned int nch, unsigned int ns)
+{
+ unsigned int phase, ch, s, sb, pe, po;
+ mad_fixed_t *pcm1, *pcm2, (*filter)[2][2][16][8];
+ mad_fixed_t const (*sbsample)[36][32];
+ register mad_fixed_t (*fe)[8], (*fx)[8], (*fo)[8];
+ register mad_fixed_t const (*Dptr)[32], *ptr;
+ register mad_fixed64hi_t hi;
+ register mad_fixed64lo_t lo;
+
+ for (ch = 0; ch < nch; ++ch) {
+ sbsample = &frame->sbsample[ch];
+ filter = &synth->filter[ch];
+ phase = synth->phase;
+ pcm1 = synth->pcm.samples[ch];
+
+ for (s = 0; s < ns; ++s) {
+ dct32((*sbsample)[s], phase >> 1,
+ (*filter)[0][phase & 1], (*filter)[1][phase & 1]);
+
+ pe = phase & ~1;
+ po = ((phase - 1) & 0xf) | 1;
+
+ /* calculate 32 samples */
+
+ fe = &(*filter)[0][ phase & 1][0];
+ fx = &(*filter)[0][~phase & 1][0];
+ fo = &(*filter)[1][~phase & 1][0];
+
+ Dptr = &D[0];
+
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fx)[0], ptr[ 0]);
+ MLA(hi, lo, (*fx)[1], ptr[14]);
+ MLA(hi, lo, (*fx)[2], ptr[12]);
+ MLA(hi, lo, (*fx)[3], ptr[10]);
+ MLA(hi, lo, (*fx)[4], ptr[ 8]);
+ MLA(hi, lo, (*fx)[5], ptr[ 6]);
+ MLA(hi, lo, (*fx)[6], ptr[ 4]);
+ MLA(hi, lo, (*fx)[7], ptr[ 2]);
+ MLN(hi, lo);
+
+ ptr = *Dptr + pe;
+ MLA(hi, lo, (*fe)[0], ptr[ 0]);
+ MLA(hi, lo, (*fe)[1], ptr[14]);
+ MLA(hi, lo, (*fe)[2], ptr[12]);
+ MLA(hi, lo, (*fe)[3], ptr[10]);
+ MLA(hi, lo, (*fe)[4], ptr[ 8]);
+ MLA(hi, lo, (*fe)[5], ptr[ 6]);
+ MLA(hi, lo, (*fe)[6], ptr[ 4]);
+ MLA(hi, lo, (*fe)[7], ptr[ 2]);
+
+ *pcm1++ = SHIFT(MLZ(hi, lo));
+
+ pcm2 = pcm1 + 30;
+
+ for (sb = 1; sb < 16; ++sb) {
+ ++fe;
+ ++Dptr;
+
+ /* D[32 - sb][i] == -D[sb][31 - i] */
+
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fo)[0], ptr[ 0]);
+ MLA(hi, lo, (*fo)[1], ptr[14]);
+ MLA(hi, lo, (*fo)[2], ptr[12]);
+ MLA(hi, lo, (*fo)[3], ptr[10]);
+ MLA(hi, lo, (*fo)[4], ptr[ 8]);
+ MLA(hi, lo, (*fo)[5], ptr[ 6]);
+ MLA(hi, lo, (*fo)[6], ptr[ 4]);
+ MLA(hi, lo, (*fo)[7], ptr[ 2]);
+ MLN(hi, lo);
+
+ ptr = *Dptr + pe;
+ MLA(hi, lo, (*fe)[7], ptr[ 2]);
+ MLA(hi, lo, (*fe)[6], ptr[ 4]);
+ MLA(hi, lo, (*fe)[5], ptr[ 6]);
+ MLA(hi, lo, (*fe)[4], ptr[ 8]);
+ MLA(hi, lo, (*fe)[3], ptr[10]);
+ MLA(hi, lo, (*fe)[2], ptr[12]);
+ MLA(hi, lo, (*fe)[1], ptr[14]);
+ MLA(hi, lo, (*fe)[0], ptr[ 0]);
+
+ *pcm1++ = SHIFT(MLZ(hi, lo));
+
+ ptr = *Dptr - pe;
+ ML0(hi, lo, (*fe)[0], ptr[31 - 16]);
+ MLA(hi, lo, (*fe)[1], ptr[31 - 14]);
+ MLA(hi, lo, (*fe)[2], ptr[31 - 12]);
+ MLA(hi, lo, (*fe)[3], ptr[31 - 10]);
+ MLA(hi, lo, (*fe)[4], ptr[31 - 8]);
+ MLA(hi, lo, (*fe)[5], ptr[31 - 6]);
+ MLA(hi, lo, (*fe)[6], ptr[31 - 4]);
+ MLA(hi, lo, (*fe)[7], ptr[31 - 2]);
+
+ ptr = *Dptr - po;
+ MLA(hi, lo, (*fo)[7], ptr[31 - 2]);
+ MLA(hi, lo, (*fo)[6], ptr[31 - 4]);
+ MLA(hi, lo, (*fo)[5], ptr[31 - 6]);
+ MLA(hi, lo, (*fo)[4], ptr[31 - 8]);
+ MLA(hi, lo, (*fo)[3], ptr[31 - 10]);
+ MLA(hi, lo, (*fo)[2], ptr[31 - 12]);
+ MLA(hi, lo, (*fo)[1], ptr[31 - 14]);
+ MLA(hi, lo, (*fo)[0], ptr[31 - 16]);
+
+ *pcm2-- = SHIFT(MLZ(hi, lo));
+
+ ++fo;
+ }
+
+ ++Dptr;
+
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fo)[0], ptr[ 0]);
+ MLA(hi, lo, (*fo)[1], ptr[14]);
+ MLA(hi, lo, (*fo)[2], ptr[12]);
+ MLA(hi, lo, (*fo)[3], ptr[10]);
+ MLA(hi, lo, (*fo)[4], ptr[ 8]);
+ MLA(hi, lo, (*fo)[5], ptr[ 6]);
+ MLA(hi, lo, (*fo)[6], ptr[ 4]);
+ MLA(hi, lo, (*fo)[7], ptr[ 2]);
+
+ *pcm1 = SHIFT(-MLZ(hi, lo));
+ pcm1 += 16;
+
+ phase = (phase + 1) % 16;
+ }
+ }
+}
+# endif
+
+/*
+ * NAME: synth->half()
+ * DESCRIPTION: perform half frequency PCM synthesis
+ */
+static
+void synth_half(struct mad_synth *synth, struct mad_frame const *frame,
+ unsigned int nch, unsigned int ns)
+{
+ unsigned int phase, ch, s, sb, pe, po;
+ mad_fixed_t *pcm1, *pcm2, (*filter)[2][2][16][8];
+ mad_fixed_t const (*sbsample)[36][32];
+ register mad_fixed_t (*fe)[8], (*fx)[8], (*fo)[8];
+ register mad_fixed_t const (*Dptr)[32], *ptr;
+ register mad_fixed64hi_t hi;
+ register mad_fixed64lo_t lo;
+
+ for (ch = 0; ch < nch; ++ch) {
+ sbsample = &frame->sbsample[ch];
+ filter = &synth->filter[ch];
+ phase = synth->phase;
+ pcm1 = synth->pcm.samples[ch];
+
+ for (s = 0; s < ns; ++s) {
+ dct32((*sbsample)[s], phase >> 1,
+ (*filter)[0][phase & 1], (*filter)[1][phase & 1]);
+
+ pe = phase & ~1;
+ po = ((phase - 1) & 0xf) | 1;
+
+ /* calculate 16 samples */
+
+ fe = &(*filter)[0][ phase & 1][0];
+ fx = &(*filter)[0][~phase & 1][0];
+ fo = &(*filter)[1][~phase & 1][0];
+
+ Dptr = &D[0];
+
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fx)[0], ptr[ 0]);
+ MLA(hi, lo, (*fx)[1], ptr[14]);
+ MLA(hi, lo, (*fx)[2], ptr[12]);
+ MLA(hi, lo, (*fx)[3], ptr[10]);
+ MLA(hi, lo, (*fx)[4], ptr[ 8]);
+ MLA(hi, lo, (*fx)[5], ptr[ 6]);
+ MLA(hi, lo, (*fx)[6], ptr[ 4]);
+ MLA(hi, lo, (*fx)[7], ptr[ 2]);
+ MLN(hi, lo);
+
+ ptr = *Dptr + pe;
+ MLA(hi, lo, (*fe)[0], ptr[ 0]);
+ MLA(hi, lo, (*fe)[1], ptr[14]);
+ MLA(hi, lo, (*fe)[2], ptr[12]);
+ MLA(hi, lo, (*fe)[3], ptr[10]);
+ MLA(hi, lo, (*fe)[4], ptr[ 8]);
+ MLA(hi, lo, (*fe)[5], ptr[ 6]);
+ MLA(hi, lo, (*fe)[6], ptr[ 4]);
+ MLA(hi, lo, (*fe)[7], ptr[ 2]);
+
+ *pcm1++ = SHIFT(MLZ(hi, lo));
+
+ pcm2 = pcm1 + 14;
+
+ for (sb = 1; sb < 16; ++sb) {
+ ++fe;
+ ++Dptr;
+
+ /* D[32 - sb][i] == -D[sb][31 - i] */
+
+ if (!(sb & 1)) {
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fo)[0], ptr[ 0]);
+ MLA(hi, lo, (*fo)[1], ptr[14]);
+ MLA(hi, lo, (*fo)[2], ptr[12]);
+ MLA(hi, lo, (*fo)[3], ptr[10]);
+ MLA(hi, lo, (*fo)[4], ptr[ 8]);
+ MLA(hi, lo, (*fo)[5], ptr[ 6]);
+ MLA(hi, lo, (*fo)[6], ptr[ 4]);
+ MLA(hi, lo, (*fo)[7], ptr[ 2]);
+ MLN(hi, lo);
+
+ ptr = *Dptr + pe;
+ MLA(hi, lo, (*fe)[7], ptr[ 2]);
+ MLA(hi, lo, (*fe)[6], ptr[ 4]);
+ MLA(hi, lo, (*fe)[5], ptr[ 6]);
+ MLA(hi, lo, (*fe)[4], ptr[ 8]);
+ MLA(hi, lo, (*fe)[3], ptr[10]);
+ MLA(hi, lo, (*fe)[2], ptr[12]);
+ MLA(hi, lo, (*fe)[1], ptr[14]);
+ MLA(hi, lo, (*fe)[0], ptr[ 0]);
+
+ *pcm1++ = SHIFT(MLZ(hi, lo));
+
+ ptr = *Dptr - po;
+ ML0(hi, lo, (*fo)[7], ptr[31 - 2]);
+ MLA(hi, lo, (*fo)[6], ptr[31 - 4]);
+ MLA(hi, lo, (*fo)[5], ptr[31 - 6]);
+ MLA(hi, lo, (*fo)[4], ptr[31 - 8]);
+ MLA(hi, lo, (*fo)[3], ptr[31 - 10]);
+ MLA(hi, lo, (*fo)[2], ptr[31 - 12]);
+ MLA(hi, lo, (*fo)[1], ptr[31 - 14]);
+ MLA(hi, lo, (*fo)[0], ptr[31 - 16]);
+
+ ptr = *Dptr - pe;
+ MLA(hi, lo, (*fe)[0], ptr[31 - 16]);
+ MLA(hi, lo, (*fe)[1], ptr[31 - 14]);
+ MLA(hi, lo, (*fe)[2], ptr[31 - 12]);
+ MLA(hi, lo, (*fe)[3], ptr[31 - 10]);
+ MLA(hi, lo, (*fe)[4], ptr[31 - 8]);
+ MLA(hi, lo, (*fe)[5], ptr[31 - 6]);
+ MLA(hi, lo, (*fe)[6], ptr[31 - 4]);
+ MLA(hi, lo, (*fe)[7], ptr[31 - 2]);
+
+ *pcm2-- = SHIFT(MLZ(hi, lo));
+ }
+
+ ++fo;
+ }
+
+ ++Dptr;
+
+ ptr = *Dptr + po;
+ ML0(hi, lo, (*fo)[0], ptr[ 0]);
+ MLA(hi, lo, (*fo)[1], ptr[14]);
+ MLA(hi, lo, (*fo)[2], ptr[12]);
+ MLA(hi, lo, (*fo)[3], ptr[10]);
+ MLA(hi, lo, (*fo)[4], ptr[ 8]);
+ MLA(hi, lo, (*fo)[5], ptr[ 6]);
+ MLA(hi, lo, (*fo)[6], ptr[ 4]);
+ MLA(hi, lo, (*fo)[7], ptr[ 2]);
+
+ *pcm1 = SHIFT(-MLZ(hi, lo));
+ pcm1 += 8;
+
+ phase = (phase + 1) % 16;
+ }
+ }
+}
+
+/*
+ * NAME: synth->frame()
+ * DESCRIPTION: perform PCM synthesis of frame subband samples
+ */
+void mad_synth_frame(struct mad_synth *synth, struct mad_frame const *frame)
+{
+ unsigned int nch, ns;
+ void (*synth_frame)(struct mad_synth *, struct mad_frame const *,
+ unsigned int, unsigned int);
+
+ nch = MAD_NCHANNELS(&frame->header);
+ ns = MAD_NSBSAMPLES(&frame->header);
+
+ synth->pcm.samplerate = frame->header.samplerate;
+ synth->pcm.channels = nch;
+ synth->pcm.length = 32 * ns;
+
+ synth_frame = synth_full;
+
+ if (frame->options & MAD_OPTION_HALFSAMPLERATE) {
+ synth->pcm.samplerate /= 2;
+ synth->pcm.length /= 2;
+
+ synth_frame = synth_half;
+ }
+
+ synth_frame(synth, frame, nch, ns);
+
+ synth->phase = (synth->phase + ns) % 16;
+}
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