diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/isp_az.c')
-rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/isp_az.c | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/isp_az.c b/media/libstagefright/codecs/amrwbenc/src/isp_az.c deleted file mode 100644 index 30a8bbd..0000000 --- a/media/libstagefright/codecs/amrwbenc/src/isp_az.c +++ /dev/null @@ -1,247 +0,0 @@ -/* - ** 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: isp_az.c * -* * -* Description:Compute the LPC coefficients from isp (order=M) * -* * -************************************************************************/ - -#include "typedef.h" -#include "basic_op.h" -#include "oper_32b.h" -#include "cnst.h" - -#define NC (M/2) -#define NC16k (M16k/2) - -/* local function */ - -static void Get_isp_pol(Word16 * isp, Word32 * f, Word16 n); -static void Get_isp_pol_16kHz(Word16 * isp, Word32 * f, Word16 n); - -void Isp_Az( - Word16 isp[], /* (i) Q15 : Immittance spectral pairs */ - Word16 a[], /* (o) Q12 : predictor coefficients (order = M) */ - Word16 m, - Word16 adaptive_scaling /* (i) 0 : adaptive scaling disabled */ - /* 1 : adaptive scaling enabled */ - ) -{ - Word32 i, j; - Word16 hi, lo; - Word32 f1[NC16k + 1], f2[NC16k]; - Word16 nc; - Word32 t0; - Word16 q, q_sug; - Word32 tmax; - - nc = (m >> 1); - if(nc > 8) - { - Get_isp_pol_16kHz(&isp[0], f1, nc); - for (i = 0; i <= nc; i++) - { - f1[i] = f1[i] << 2; - } - } else - Get_isp_pol(&isp[0], f1, nc); - - if (nc > 8) - { - Get_isp_pol_16kHz(&isp[1], f2, (nc - 1)); - for (i = 0; i <= nc - 1; i++) - { - f2[i] = f2[i] << 2; - } - } else - Get_isp_pol(&isp[1], f2, (nc - 1)); - - /*-----------------------------------------------------* - * Multiply F2(z) by (1 - z^-2) * - *-----------------------------------------------------*/ - - for (i = (nc - 1); i > 1; i--) - { - f2[i] = vo_L_sub(f2[i], f2[i - 2]); /* f2[i] -= f2[i-2]; */ - } - - /*----------------------------------------------------------* - * Scale F1(z) by (1+isp[m-1]) and F2(z) by (1-isp[m-1]) * - *----------------------------------------------------------*/ - - for (i = 0; i < nc; i++) - { - /* f1[i] *= (1.0 + isp[M-1]); */ - - hi = f1[i] >> 16; - lo = (f1[i] & 0xffff)>>1; - - t0 = Mpy_32_16(hi, lo, isp[m - 1]); - f1[i] = vo_L_add(f1[i], t0); - - /* f2[i] *= (1.0 - isp[M-1]); */ - - hi = f2[i] >> 16; - lo = (f2[i] & 0xffff)>>1; - t0 = Mpy_32_16(hi, lo, isp[m - 1]); - f2[i] = vo_L_sub(f2[i], t0); - } - - /*-----------------------------------------------------* - * A(z) = (F1(z)+F2(z))/2 * - * F1(z) is symmetric and F2(z) is antisymmetric * - *-----------------------------------------------------*/ - - /* a[0] = 1.0; */ - a[0] = 4096; - tmax = 1; - for (i = 1, j = m - 1; i < nc; i++, j--) - { - /* a[i] = 0.5*(f1[i] + f2[i]); */ - - t0 = vo_L_add(f1[i], f2[i]); /* f1[i] + f2[i] */ - tmax |= L_abs(t0); - a[i] = (Word16)(vo_L_shr_r(t0, 12)); /* from Q23 to Q12 and * 0.5 */ - - /* a[j] = 0.5*(f1[i] - f2[i]); */ - - t0 = vo_L_sub(f1[i], f2[i]); /* f1[i] - f2[i] */ - tmax |= L_abs(t0); - a[j] = (Word16)(vo_L_shr_r(t0, 12)); /* from Q23 to Q12 and * 0.5 */ - } - - /* rescale data if overflow has occured and reprocess the loop */ - if(adaptive_scaling == 1) - q = 4 - norm_l(tmax); /* adaptive scaling enabled */ - else - q = 0; /* adaptive scaling disabled */ - - if (q > 0) - { - q_sug = (12 + q); - for (i = 1, j = m - 1; i < nc; i++, j--) - { - /* a[i] = 0.5*(f1[i] + f2[i]); */ - t0 = vo_L_add(f1[i], f2[i]); /* f1[i] + f2[i] */ - a[i] = (Word16)(vo_L_shr_r(t0, q_sug)); /* from Q23 to Q12 and * 0.5 */ - - /* a[j] = 0.5*(f1[i] - f2[i]); */ - t0 = vo_L_sub(f1[i], f2[i]); /* f1[i] - f2[i] */ - a[j] = (Word16)(vo_L_shr_r(t0, q_sug)); /* from Q23 to Q12 and * 0.5 */ - } - a[0] = shr(a[0], q); - } - else - { - q_sug = 12; - q = 0; - } - /* a[NC] = 0.5*f1[NC]*(1.0 + isp[M-1]); */ - hi = f1[nc] >> 16; - lo = (f1[nc] & 0xffff)>>1; - t0 = Mpy_32_16(hi, lo, isp[m - 1]); - t0 = vo_L_add(f1[nc], t0); - a[nc] = (Word16)(L_shr_r(t0, q_sug)); /* from Q23 to Q12 and * 0.5 */ - /* a[m] = isp[m-1]; */ - - a[m] = vo_shr_r(isp[m - 1], (3 + q)); /* from Q15 to Q12 */ - return; -} - -/*-----------------------------------------------------------* -* procedure Get_isp_pol: * -* ~~~~~~~~~~~ * -* Find the polynomial F1(z) or F2(z) from the ISPs. * -* This is performed by expanding the product polynomials: * -* * -* F1(z) = product ( 1 - 2 isp_i z^-1 + z^-2 ) * -* i=0,2,4,6,8 * -* F2(z) = product ( 1 - 2 isp_i z^-1 + z^-2 ) * -* i=1,3,5,7 * -* * -* where isp_i are the ISPs in the cosine domain. * -*-----------------------------------------------------------* -* * -* Parameters: * -* isp[] : isp vector (cosine domaine) in Q15 * -* f[] : the coefficients of F1 or F2 in Q23 * -* n : == NC for F1(z); == NC-1 for F2(z) * -*-----------------------------------------------------------*/ - -static void Get_isp_pol(Word16 * isp, Word32 * f, Word16 n) -{ - Word16 hi, lo; - Word32 i, j, t0; - /* All computation in Q23 */ - - f[0] = vo_L_mult(4096, 1024); /* f[0] = 1.0; in Q23 */ - f[1] = vo_L_mult(isp[0], -256); /* f[1] = -2.0*isp[0] in Q23 */ - - f += 2; /* Advance f pointer */ - isp += 2; /* Advance isp pointer */ - for (i = 2; i <= n; i++) - { - *f = f[-2]; - for (j = 1; j < i; j++, f--) - { - hi = f[-1]>>16; - lo = (f[-1] & 0xffff)>>1; - - t0 = Mpy_32_16(hi, lo, *isp); /* t0 = f[-1] * isp */ - t0 = t0 << 1; - *f = vo_L_sub(*f, t0); /* *f -= t0 */ - *f = vo_L_add(*f, f[-2]); /* *f += f[-2] */ - } - *f -= (*isp << 9); /* *f -= isp<<8 */ - f += i; /* Advance f pointer */ - isp += 2; /* Advance isp pointer */ - } - return; -} - -static void Get_isp_pol_16kHz(Word16 * isp, Word32 * f, Word16 n) -{ - Word16 hi, lo; - Word32 i, j, t0; - - /* All computation in Q23 */ - f[0] = L_mult(4096, 256); /* f[0] = 1.0; in Q23 */ - f[1] = L_mult(isp[0], -64); /* f[1] = -2.0*isp[0] in Q23 */ - - f += 2; /* Advance f pointer */ - isp += 2; /* Advance isp pointer */ - - for (i = 2; i <= n; i++) - { - *f = f[-2]; - for (j = 1; j < i; j++, f--) - { - VO_L_Extract(f[-1], &hi, &lo); - t0 = Mpy_32_16(hi, lo, *isp); /* t0 = f[-1] * isp */ - t0 = L_shl2(t0, 1); - *f = L_sub(*f, t0); /* *f -= t0 */ - *f = L_add(*f, f[-2]); /* *f += f[-2] */ - } - *f = L_msu(*f, *isp, 64); /* *f -= isp<<8 */ - f += i; /* Advance f pointer */ - isp += 2; /* Advance isp pointer */ - } - return; -} - - |