From 956c553ab0ce72f8074ad0fda2ffd66a0305700c Mon Sep 17 00:00:00 2001 From: James Dong Date: Fri, 14 May 2010 15:45:22 -0700 Subject: Initial software encoder checkins Change-Id: I27f387db23594e46384c4eb3a0093ce220bb6b60 --- media/libstagefright/codecs/amrwbenc/src/c2t64fx.c | 297 +++++++++++++++++++++ 1 file changed, 297 insertions(+) create mode 100644 media/libstagefright/codecs/amrwbenc/src/c2t64fx.c (limited to 'media/libstagefright/codecs/amrwbenc/src/c2t64fx.c') diff --git a/media/libstagefright/codecs/amrwbenc/src/c2t64fx.c b/media/libstagefright/codecs/amrwbenc/src/c2t64fx.c new file mode 100644 index 0000000..39fc4c5 --- /dev/null +++ b/media/libstagefright/codecs/amrwbenc/src/c2t64fx.c @@ -0,0 +1,297 @@ +/* + ** Copyright 2003-2010, VisualOn, Inc. + ** + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** + ** http://www.apache.org/licenses/LICENSE-2.0 + ** + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + */ + +/************************************************************************ +* File: c2t64fx.c * +* * +* Description:Performs algebraic codebook search for 6.60kbits mode* +* * +*************************************************************************/ + +#include "typedef.h" +#include "basic_op.h" +#include "math_op.h" +#include "acelp.h" +#include "cnst.h" + +#define NB_TRACK 2 +#define STEP 2 +#define NB_POS 32 +#define MSIZE 1024 + +/************************************************************************* +* Function: ACELP_2t64_fx() * +* * +* 12 bits algebraic codebook. * +* 2 tracks x 32 positions per track = 64 samples. * +* * +* 12 bits --> 2 pulses in a frame of 64 samples. * +* * +* All pulses can have two (2) possible amplitudes: +1 or -1. * +* Each pulse can have 32 possible positions. * +**************************************************************************/ + +void ACELP_2t64_fx( + Word16 dn[], /* (i) <12b : correlation between target x[] and H[] */ + Word16 cn[], /* (i) <12b : residual after long term prediction */ + Word16 H[], /* (i) Q12: impulse response of weighted synthesis filter */ + Word16 code[], /* (o) Q9 : algebraic (fixed) codebook excitation */ + Word16 y[], /* (o) Q9 : filtered fixed codebook excitation */ + Word16 * index /* (o) : index (12): 5+1+5+1 = 11 bits. */ + ) +{ + Word32 i, j, k, i0, i1, ix, iy, pos, pos2; + Word16 ps, psk, ps1, ps2, alpk, alp1, alp2, sq; + Word16 alp, val, exp, k_cn, k_dn; + Word16 *p0, *p1, *p2, *psign; + Word16 *h, *h_inv, *ptr_h1, *ptr_h2, *ptr_hf; + + Word16 sign[L_SUBFR], vec[L_SUBFR], dn2[L_SUBFR]; + Word16 h_buf[4 * L_SUBFR] = {0}; + Word16 rrixix[NB_TRACK][NB_POS]; + Word16 rrixiy[MSIZE]; + Word32 s, cor; + + /*----------------------------------------------------------------* + * Find sign for each pulse position. * + *----------------------------------------------------------------*/ + alp = 8192; /* alp = 2.0 (Q12) */ + + /* calculate energy for normalization of cn[] and dn[] */ + /* set k_cn = 32..32767 (ener_cn = 2^30..256-0) */ +#ifdef ASM_OPT /* asm optimization branch */ + s = Dot_product12_asm(cn, cn, L_SUBFR, &exp); +#else + s = Dot_product12(cn, cn, L_SUBFR, &exp); +#endif + + Isqrt_n(&s, &exp); + s = L_shl(s, add1(exp, 5)); + k_cn = vo_round(s); + + /* set k_dn = 32..512 (ener_dn = 2^30..2^22) */ +#ifdef ASM_OPT /* asm optimization branch */ + s = Dot_product12_asm(dn, dn, L_SUBFR, &exp); +#else + s = Dot_product12(dn, dn, L_SUBFR, &exp); +#endif + + Isqrt_n(&s, &exp); + k_dn = vo_round(L_shl(s, (exp + 8))); /* k_dn = 256..4096 */ + k_dn = vo_mult_r(alp, k_dn); /* alp in Q12 */ + + /* mix normalized cn[] and dn[] */ + p0 = cn; + p1 = dn; + p2 = dn2; + + for (i = 0; i < L_SUBFR/4; i++) + { + s = (k_cn* (*p0++))+(k_dn * (*p1++)); + *p2++ = s >> 7; + s = (k_cn* (*p0++))+(k_dn * (*p1++)); + *p2++ = s >> 7; + s = (k_cn* (*p0++))+(k_dn * (*p1++)); + *p2++ = s >> 7; + s = (k_cn* (*p0++))+(k_dn * (*p1++)); + *p2++ = s >> 7; + } + + /* set sign according to dn2[] = k_cn*cn[] + k_dn*dn[] */ + for (i = 0; i < L_SUBFR; i ++) + { + val = dn[i]; + ps = dn2[i]; + if (ps >= 0) + { + sign[i] = 32767; /* sign = +1 (Q12) */ + vec[i] = -32768; + } else + { + sign[i] = -32768; /* sign = -1 (Q12) */ + vec[i] = 32767; + dn[i] = -val; + } + } + /*------------------------------------------------------------* + * Compute h_inv[i]. * + *------------------------------------------------------------*/ + /* impulse response buffer for fast computation */ + h = h_buf + L_SUBFR; + h_inv = h + (L_SUBFR<<1); + + for (i = 0; i < L_SUBFR; i++) + { + h[i] = H[i]; + h_inv[i] = vo_negate(h[i]); + } + + /*------------------------------------------------------------* + * Compute rrixix[][] needed for the codebook search. * + * Result is multiplied by 0.5 * + *------------------------------------------------------------*/ + /* Init pointers to last position of rrixix[] */ + p0 = &rrixix[0][NB_POS - 1]; + p1 = &rrixix[1][NB_POS - 1]; + + ptr_h1 = h; + cor = 0x00010000L; /* for rounding */ + for (i = 0; i < NB_POS; i++) + { + cor += ((*ptr_h1) * (*ptr_h1) << 1); + ptr_h1++; + *p1-- = (extract_h(cor) >> 1); + cor += ((*ptr_h1) * (*ptr_h1) << 1); + ptr_h1++; + *p0-- = (extract_h(cor) >> 1); + } + + /*------------------------------------------------------------* + * Compute rrixiy[][] needed for the codebook search. * + *------------------------------------------------------------*/ + pos = MSIZE - 1; + pos2 = MSIZE - 2; + ptr_hf = h + 1; + + for (k = 0; k < NB_POS; k++) + { + p1 = &rrixiy[pos]; + p0 = &rrixiy[pos2]; + cor = 0x00008000L; /* for rounding */ + ptr_h1 = h; + ptr_h2 = ptr_hf; + + for (i = (k + 1); i < NB_POS; i++) + { + cor += ((*ptr_h1) * (*ptr_h2))<<1; + ptr_h1++; + ptr_h2++; + *p1 = extract_h(cor); + cor += ((*ptr_h1) * (*ptr_h2))<<1; + ptr_h1++; + ptr_h2++; + *p0 = extract_h(cor); + + p1 -= (NB_POS + 1); + p0 -= (NB_POS + 1); + } + cor += ((*ptr_h1) * (*ptr_h2))<<1; + ptr_h1++; + ptr_h2++; + *p1 = extract_h(cor); + + pos -= NB_POS; + pos2--; + ptr_hf += STEP; + } + + /*------------------------------------------------------------* + * Modification of rrixiy[][] to take signs into account. * + *------------------------------------------------------------*/ + p0 = rrixiy; + for (i = 0; i < L_SUBFR; i += STEP) + { + psign = sign; + if (psign[i] < 0) + { + psign = vec; + } + for (j = 1; j < L_SUBFR; j += STEP) + { + *p0 = vo_mult(*p0, psign[j]); + p0++; + } + } + /*-------------------------------------------------------------------* + * search 2 pulses: * + * ~@~~~~~~~~~~~~~~ * + * 32 pos x 32 pos = 1024 tests (all combinaisons is tested) * + *-------------------------------------------------------------------*/ + p0 = rrixix[0]; + p1 = rrixix[1]; + p2 = rrixiy; + + psk = -1; + alpk = 1; + ix = 0; + iy = 1; + + for (i0 = 0; i0 < L_SUBFR; i0 += STEP) + { + ps1 = dn[i0]; + alp1 = (*p0++); + pos = -1; + for (i1 = 1; i1 < L_SUBFR; i1 += STEP) + { + ps2 = add1(ps1, dn[i1]); + alp2 = add1(alp1, add1(*p1++, *p2++)); + sq = vo_mult(ps2, ps2); + s = vo_L_mult(alpk, sq) - ((psk * alp2)<<1); + if (s > 0) + { + psk = sq; + alpk = alp2; + pos = i1; + } + } + p1 -= NB_POS; + if (pos >= 0) + { + ix = i0; + iy = pos; + } + } + /*-------------------------------------------------------------------* + * Build the codeword, the filtered codeword and index of codevector.* + *-------------------------------------------------------------------*/ + + for (i = 0; i < L_SUBFR; i++) + { + code[i] = 0; + } + + i0 = (ix >> 1); /* pos of pulse 1 (0..31) */ + i1 = (iy >> 1); /* pos of pulse 2 (0..31) */ + if (sign[ix] > 0) + { + code[ix] = 512; /* codeword in Q9 format */ + p0 = h - ix; + } else + { + code[ix] = -512; + i0 += NB_POS; + p0 = h_inv - ix; + } + if (sign[iy] > 0) + { + code[iy] = 512; + p1 = h - iy; + } else + { + code[iy] = -512; + i1 += NB_POS; + p1 = h_inv - iy; + } + *index = add1((i0 << 6), i1); + for (i = 0; i < L_SUBFR; i++) + { + y[i] = vo_shr_r(add1((*p0++), (*p1++)), 3); + } + return; +} + + + -- cgit v1.1