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| author | Monty <xiphmont@xiph.org> | 2002-10-16 09:17:39 +0000 |
|---|---|---|
| committer | Monty <xiphmont@xiph.org> | 2002-10-16 09:17:39 +0000 |
| commit | bbef83c423f7438bc8f4108107b06450b6731dd9 (patch) | |
| tree | 54bb320e3703ba01a1d7852dc46dab649ee35a8f /mdct.c | |
| parent | 372741a58e08b3dbdd796354de44a52323a6c927 (diff) | |
| download | tremor-bbef83c423f7438bc8f4108107b06450b6731dd9.tar.gz | |
Fix to Nicolas Pitre's interpolated MDCT for 4096 and 8192
git-svn-id: https://svn.xiph.org/trunk/Tremor@4014 0101bb08-14d6-0310-b084-bc0e0c8e3800
Diffstat (limited to 'mdct.c')
| -rw-r--r-- | mdct.c | 18 |
1 files changed, 9 insertions, 9 deletions
@@ -13,7 +13,7 @@ function: normalized modified discrete cosine transform power of two length transform only [64 <= n ] - last mod: $Id: mdct.c,v 1.8 2002/10/16 09:07:00 xiphmont Exp $ + last mod: $Id: mdct.c,v 1.9 2002/10/16 09:17:39 xiphmont Exp $ Original algorithm adapted long ago from _The use of multirate filter banks for coding of high quality digital audio_, by T. Sporer, @@ -425,16 +425,16 @@ void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){ t0 += (v0 = (*V++)>>1); t1 += (v1 = (*V++)>>1); - XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); T+=step; + XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); v0 += (t0 = (*T++)>>1); v1 += (t1 = (*T++)>>1); - XPROD31( iX[2], -iX[3], v0, v1, &oX1[2], &oX2[1] ); T+=step; + XPROD31( iX[2], -iX[3], v0, v1, &oX1[2], &oX2[1] ); t0 += (v0 = (*V++)>>1); t1 += (v1 = (*V++)>>1); - XPROD31( iX[4], -iX[5], t0, t1, &oX1[1], &oX2[2] ); T+=step; + XPROD31( iX[4], -iX[5], t0, t1, &oX1[1], &oX2[2] ); v0 += (t0 = (*T++)>>1); v1 += (t1 = (*T++)>>1); - XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); T+=step; + XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); oX2+=4; iX+=8; @@ -456,19 +456,19 @@ void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){ v1 = *V++; t0 += (q0 = (v0-t0)>>2); t1 += (q1 = (v1-t1)>>2); - XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); T+=step; + XPROD31( iX[0], -iX[1], t0, t1, &oX1[3], &oX2[0] ); t0 = v0-q0; t1 = v1-q1; - XPROD31( iX[2], -iX[3], t0, t1, &oX1[2], &oX2[1] ); T+=step; + XPROD31( iX[2], -iX[3], t0, t1, &oX1[2], &oX2[1] ); t0 = *T++; t1 = *T++; v0 += (q0 = (t0-v0)>>2); v1 += (q1 = (t1-v1)>>2); - XPROD31( iX[4], -iX[5], v0, v1, &oX1[1], &oX2[2] ); T+=step; + XPROD31( iX[4], -iX[5], v0, v1, &oX1[1], &oX2[2] ); v0 = t0-q0; v1 = t1-q1; - XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); T+=step; + XPROD31( iX[6], -iX[7], v0, v1, &oX1[0], &oX2[3] ); oX2+=4; iX+=8; |