diff options
Diffstat (limited to 'libavcodec/lpc.h')
| -rw-r--r-- | libavcodec/lpc.h | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h index 642854c..9b76e2f 100644 --- a/libavcodec/lpc.h +++ b/libavcodec/lpc.h @@ -2,20 +2,20 @@ * LPC utility code * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com> * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -23,6 +23,9 @@ #define AVCODEC_LPC_H #include <stdint.h> +#include "libavutil/avassert.h" +#include "libavutil/lls.h" +#include "aac_defines.h" #define ORDER_METHOD_EST 0 #define ORDER_METHOD_2LEVEL 1 @@ -66,7 +69,7 @@ typedef struct LPCContext { /** * Perform autocorrelation on input samples with delay of 0 to lag. * @param data input samples. - * constraints: no alignment needed, but must have have at + * constraints: no alignment needed, but must have at * least lag*sizeof(double) valid bytes preceding it, and * size must be at least (len+1)*sizeof(double) if data is * 16-byte aligned or (len+2)*sizeof(double) if data is @@ -78,6 +81,9 @@ typedef struct LPCContext { */ void (*lpc_compute_autocorr)(const double *data, int len, int lag, double *autoc); + + // TODO: these should be allocated to reduce ABI compatibility issues + LLSModel lls_models[2]; } LPCContext; @@ -106,11 +112,15 @@ void ff_lpc_init_x86(LPCContext *s); */ void ff_lpc_end(LPCContext *s); +#if USE_FIXED +#define LPC_TYPE int +#else #ifdef LPC_USE_DOUBLE #define LPC_TYPE double #else #define LPC_TYPE float #endif +#endif // USE_FIXED /** * Schur recursion. @@ -147,7 +157,7 @@ static inline void compute_ref_coefs(const LPC_TYPE *autoc, int max_order, * Levinson-Durbin recursion. * Produce LPC coefficients from autocorrelation data. */ -static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order, +static inline int AAC_RENAME(compute_lpc_coefs)(const LPC_TYPE *autoc, int max_order, LPC_TYPE *lpc, int lpc_stride, int fail, int normalize) { @@ -155,6 +165,8 @@ static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order, LPC_TYPE err = 0; LPC_TYPE *lpc_last = lpc; + av_assert2(normalize || !fail); + if (normalize) err = *autoc++; @@ -162,14 +174,14 @@ static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order, return -1; for(i=0; i<max_order; i++) { - LPC_TYPE r = -autoc[i]; + LPC_TYPE r = AAC_SRA_R(-autoc[i], 5); if (normalize) { for(j=0; j<i; j++) r -= lpc_last[j] * autoc[i-j-1]; r /= err; - err *= 1.0 - (r * r); + err *= FIXR(1.0) - (r * r); } lpc[i] = r; @@ -177,8 +189,8 @@ static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order, for(j=0; j < (i+1)>>1; j++) { LPC_TYPE f = lpc_last[ j]; LPC_TYPE b = lpc_last[i-1-j]; - lpc[ j] = f + r * b; - lpc[i-1-j] = b + r * f; + lpc[ j] = f + AAC_MUL26(r, b); + lpc[i-1-j] = b + AAC_MUL26(r, f); } if (fail && err < 0) |
