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| author | Djordje Pesut <djordje.pesut@imgtec.com> | 2015-07-20 13:36:17 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-20 17:20:16 +0200 |
| commit | f85bc147fb87de048ccc5767e186ac59ec0284ef (patch) | |
| tree | b94b04d6110ec84a79fa1466d29c700d04d1f841 /libavcodec/lpc.h | |
| parent | b0414da90d6da34144ad9dadd5445fe62cf755a6 (diff) | |
| download | ffmpeg-f85bc147fb87de048ccc5767e186ac59ec0284ef.tar.gz | |
avcodec: Implementation of AAC_fixed_decoder (SBR-module)
Add fixed poind code.
Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/lpc.h')
| -rw-r--r-- | libavcodec/lpc.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h index 96acb37146..9b76e2fb43 100644 --- a/libavcodec/lpc.h +++ b/libavcodec/lpc.h @@ -25,6 +25,7 @@ #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 @@ -111,11 +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. @@ -152,7 +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) { @@ -169,14 +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; @@ -184,8 +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) |