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optimize antialias 

switch to integer antialias code as default as its faster now

Originally committed as revision 3925 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-02-02 01:37:33 +00:00
parent d04728bb57
commit ce4a29c066
1 changed files with 43 additions and 67 deletions
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110
libavcodec/mpegaudiodec.c
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@ -224,7 +224,6 @@ static inline int l2_unscale_group(int steps, int mant, int scale_factor)
/* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
static inline int l3_unscale(int value, int exponent)
{
unsigned int m;
int e;
@ -323,7 +322,7 @@ static int decode_init(AVCodecContext * avctx)
avctx->sample_fmt= SAMPLE_FMT_S16;
#endif
if(avctx->antialias_algo == FF_AA_INT)
if(avctx->antialias_algo != FF_AA_FLOAT)
s->compute_antialias= compute_antialias_integer;
else
s->compute_antialias= compute_antialias_float;
@ -450,10 +449,10 @@ static int decode_init(AVCodecContext * avctx)
ci = ci_table[i];
cs = 1.0 / sqrt(1.0 + ci * ci);
ca = cs * ci;
csa_table[i][0] = FIX(cs);
csa_table[i][1] = FIX(ca);
csa_table[i][2] = FIX(ca) + FIX(cs);
csa_table[i][3] = FIX(ca) - FIX(cs);
csa_table[i][0] = FIXHR(cs/4);
csa_table[i][1] = FIXHR(ca/4);
csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
csa_table_float[i][0] = cs;
csa_table_float[i][1] = ca;
csa_table_float[i][2] = ca + cs;
@ -1911,8 +1910,8 @@ static void compute_stereo(MPADecodeContext *s,
static void compute_antialias_integer(MPADecodeContext *s,
GranuleDef *g)
{
int32_t *ptr, *p0, *p1, *csa;
int n, i, j;
int32_t *ptr, *csa;
int n, i;
/* we antialias only "long" bands */
if (g->block_type == 2) {
@ -1926,35 +1925,24 @@ static void compute_antialias_integer(MPADecodeContext *s,
ptr = g->sb_hybrid + 18;
for(i = n;i > 0;i--) {
p0 = ptr - 1;
p1 = ptr;
csa = &csa_table[0][0];
for(j=0;j<4;j++) {
int tmp0 = *p0;
int tmp1 = *p1;
#if 0
*p0 = FRAC_RND(MUL64(tmp0, csa[0]) - MUL64(tmp1, csa[1]));
*p1 = FRAC_RND(MUL64(tmp0, csa[1]) + MUL64(tmp1, csa[0]));
#else
int64_t tmp2= MUL64(tmp0 + tmp1, csa[0]);
*p0 = FRAC_RND(tmp2 - MUL64(tmp1, csa[2]));
*p1 = FRAC_RND(tmp2 + MUL64(tmp0, csa[3]));
#endif
p0--; p1++;
csa += 4;
tmp0 = *p0;
tmp1 = *p1;
#if 0
*p0 = FRAC_RND(MUL64(tmp0, csa[0]) - MUL64(tmp1, csa[1]));
*p1 = FRAC_RND(MUL64(tmp0, csa[1]) + MUL64(tmp1, csa[0]));
#else
tmp2= MUL64(tmp0 + tmp1, csa[0]);
*p0 = FRAC_RND(tmp2 - MUL64(tmp1, csa[2]));
*p1 = FRAC_RND(tmp2 + MUL64(tmp0, csa[3]));
#endif
p0--; p1++;
csa += 4;
}
int tmp0, tmp1, tmp2;
csa = &csa_table[0][0];
#define INT_AA(j) \
tmp0 = 4*(ptr[-1-j]);\
tmp1 = 4*(ptr[ j]);\
tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
ptr[-1-j] = tmp2 - MULH(tmp1, csa[2+4*j]);\
ptr[ j] = tmp2 + MULH(tmp0, csa[3+4*j]);
INT_AA(0)
INT_AA(1)
INT_AA(2)
INT_AA(3)
INT_AA(4)
INT_AA(5)
INT_AA(6)
INT_AA(7)
ptr += 18;
}
}
@ -1962,8 +1950,8 @@ static void compute_antialias_integer(MPADecodeContext *s,
static void compute_antialias_float(MPADecodeContext *s,
GranuleDef *g)
{
int32_t *ptr, *p0, *p1;
int n, i, j;
int32_t *ptr;
int n, i;
/* we antialias only "long" bands */
if (g->block_type == 2) {
@ -1977,35 +1965,23 @@ static void compute_antialias_float(MPADecodeContext *s,
ptr = g->sb_hybrid + 18;
for(i = n;i > 0;i--) {
float tmp0, tmp1;
float *csa = &csa_table_float[0][0];
p0 = ptr - 1;
p1 = ptr;
for(j=0;j<4;j++) {
float tmp0 = *p0;
float tmp1 = *p1;
#if 1
*p0 = lrintf(tmp0 * csa[0] - tmp1 * csa[1]);
*p1 = lrintf(tmp0 * csa[1] + tmp1 * csa[0]);
#else
float tmp2= (tmp0 + tmp1) * csa[0];
*p0 = lrintf(tmp2 - tmp1 * csa[2]);
*p1 = lrintf(tmp2 + tmp0 * csa[3]);
#endif
p0--; p1++;
csa += 4;
tmp0 = *p0;
tmp1 = *p1;
#if 1
*p0 = lrintf(tmp0 * csa[0] - tmp1 * csa[1]);
*p1 = lrintf(tmp0 * csa[1] + tmp1 * csa[0]);
#else
tmp2= (tmp0 + tmp1) * csa[0];
*p0 = lrintf(tmp2 - tmp1 * csa[2]);
*p1 = lrintf(tmp2 + tmp0 * csa[3]);
#endif
p0--; p1++;
csa += 4;
}
#define FLOAT_AA(j)\
tmp0= ptr[-1-j];\
tmp1= ptr[ j];\
ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
FLOAT_AA(0)
FLOAT_AA(1)
FLOAT_AA(2)
FLOAT_AA(3)
FLOAT_AA(4)
FLOAT_AA(5)
FLOAT_AA(6)
FLOAT_AA(7)
ptr += 18;
}
}