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aacenc: Favor log2f() and sqrtf() over log2() and sqrt().

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Originally committed as revision 24473 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-07-24 02:10:59 +00:00
parent 04d72abf17
commit 51ffd3a62f
1 changed files with 7 additions and 7 deletions
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14
libavcodec/aaccoder.c
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@ -517,12 +517,12 @@ static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce,
/** Return the minimum scalefactor where the quantized coef does not clip. */
static av_always_inline uint8_t coef2minsf(float coef) {
return av_clip_uint8(log2(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
}
/** Return the maximum scalefactor where the quantized coef is not zero. */
static av_always_inline uint8_t coef2maxsf(float coef) {
return av_clip_uint8(log2(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
}
typedef struct TrellisPath {
@ -572,7 +572,7 @@ static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
int q0low = q0;
int q1high = q1;
//minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped
int qnrg = av_clip_uint8(log2(sqrt(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
q1 = qnrg + 30;
q0 = qnrg - 30;
//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
@ -731,7 +731,7 @@ static void search_for_quantizers_twoloop(AVCodecContext *avctx,
sce->sf_idx[w*16+g] = SCALE_ONE_POS;
continue;
}
sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2(uplims[w*16+g]/minthr)*4,59);
sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
}
}
@ -925,7 +925,7 @@ static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
continue;
}
sce->zeroes[w*16+g] = 0;
scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2(1/maxq[w*16+g])*16/3, 60, 218);
scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218);
step = 16;
for (;;) {
float dist = 0.0f;
@ -954,7 +954,7 @@ static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
if (curdiff <= 1.0f)
step = 0;
else
step = log2(curdiff);
step = log2f(curdiff);
if (dist > uplim[w*16+g])
step = -step;
scf += step;
@ -1007,7 +1007,7 @@ static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s,
sce->sf_idx[(w+w2)*16+g] = 218;
sce->zeroes[(w+w2)*16+g] = 1;
} else {
sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2(band->threshold), 80, 218);
sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
sce->zeroes[(w+w2)*16+g] = 0;
}
minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);