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mpegaudiodec: interleave iMDCT buffer to simplify future SIMD implementations

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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
pull/3/head
Vitor Sessak 13 years ago committed by Ronald S. Bultje
parent 2170a0e6ad
commit 421c99a4a7
1 changed files with 25 additions and 25 deletions
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  1. 50
      libavcodec/mpegaudiodec.c

50
libavcodec/mpegaudiodec.c
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@ -621,17 +621,17 @@ static void imdct36(INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win)
t0 = s0 + s1;
t1 = s0 - s1;
out[(9 + j) * SBLIMIT] = MULH3(t1, win[ 9 + j], 1) + buf[9 + j];
out[(8 - j) * SBLIMIT] = MULH3(t1, win[ 8 - j], 1) + buf[8 - j];
buf[ 9 + j ] = MULH3(t0, win[18 + 9 + j], 1);
buf[ 8 - j ] = MULH3(t0, win[18 + 8 - j], 1);
out[(9 + j) * SBLIMIT] = MULH3(t1, win[ 9 + j], 1) + buf[4*(9 + j)];
out[(8 - j) * SBLIMIT] = MULH3(t1, win[ 8 - j], 1) + buf[4*(8 - j)];
buf[4 * ( 9 + j )] = MULH3(t0, win[18 + 9 + j], 1);
buf[4 * ( 8 - j )] = MULH3(t0, win[18 + 8 - j], 1);
t0 = s2 + s3;
t1 = s2 - s3;
out[(9 + 8 - j) * SBLIMIT] = MULH3(t1, win[ 9 + 8 - j], 1) + buf[9 + 8 - j];
out[ j * SBLIMIT] = MULH3(t1, win[ j], 1) + buf[ j];
buf[ 9 + 8 - j ] = MULH3(t0, win[18 + 9 + 8 - j], 1);
buf[ j ] = MULH3(t0, win[18 + j], 1);
out[(9 + 8 - j) * SBLIMIT] = MULH3(t1, win[ 9 + 8 - j], 1) + buf[4*(9 + 8 - j)];
out[ j * SBLIMIT] = MULH3(t1, win[ j], 1) + buf[4*( j)];
buf[4 * ( 9 + 8 - j )] = MULH3(t0, win[18 + 9 + 8 - j], 1);
buf[4 * ( j )] = MULH3(t0, win[18 + j], 1);
i += 4;
}
@ -639,10 +639,10 @@ static void imdct36(INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win)
s1 = MULH3(tmp[17], icos36h[4], 2);
t0 = s0 + s1;
t1 = s0 - s1;
out[(9 + 4) * SBLIMIT] = MULH3(t1, win[ 9 + 4], 1) + buf[9 + 4];
out[(8 - 4) * SBLIMIT] = MULH3(t1, win[ 8 - 4], 1) + buf[8 - 4];
buf[ 9 + 4 ] = MULH3(t0, win[18 + 9 + 4], 1);
buf[ 8 - 4 ] = MULH3(t0, win[18 + 8 - 4], 1);
out[(9 + 4) * SBLIMIT] = MULH3(t1, win[ 9 + 4], 1) + buf[4*(9 + 4)];
out[(8 - 4) * SBLIMIT] = MULH3(t1, win[ 8 - 4], 1) + buf[4*(8 - 4)];
buf[4 * ( 9 + 4 )] = MULH3(t0, win[18 + 9 + 4], 1);
buf[4 * ( 8 - 4 )] = MULH3(t0, win[18 + 8 - 4], 1);
}
/* return the number of decoded frames */
@ -1407,7 +1407,7 @@ static void compute_imdct(MPADecodeContext *s, GranuleDef *g,
imdct36(out_ptr, buf, ptr, win);
out_ptr += 18 * SBLIMIT;
ptr += 18;
buf += 18;
buf += (j&3) != 3 ? 1 : (4*18-3);
}
for (j = mdct_long_end; j < sblimit; j++) {
/* select frequency inversion */
@ -1415,40 +1415,40 @@ static void compute_imdct(MPADecodeContext *s, GranuleDef *g,
out_ptr = sb_samples + j;
for (i = 0; i < 6; i++) {
*out_ptr = buf[i];
*out_ptr = buf[4*i];
out_ptr += SBLIMIT;
}
imdct12(out2, ptr + 0);
for (i = 0; i < 6; i++) {
*out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*1];
buf[i + 6*2] = MULH3(out2[i + 6], win[i + 6], 1);
*out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*1)];
buf[4*(i + 6*2)] = MULH3(out2[i + 6], win[i + 6], 1);
out_ptr += SBLIMIT;
}
imdct12(out2, ptr + 1);
for (i = 0; i < 6; i++) {
*out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*2];
buf[i + 6*0] = MULH3(out2[i + 6], win[i + 6], 1);
*out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*2)];
buf[4*(i + 6*0)] = MULH3(out2[i + 6], win[i + 6], 1);
out_ptr += SBLIMIT;
}
imdct12(out2, ptr + 2);
for (i = 0; i < 6; i++) {
buf[i + 6*0] = MULH3(out2[i ], win[i ], 1) + buf[i + 6*0];
buf[i + 6*1] = MULH3(out2[i + 6], win[i + 6], 1);
buf[i + 6*2] = 0;
buf[4*(i + 6*0)] = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*0)];
buf[4*(i + 6*1)] = MULH3(out2[i + 6], win[i + 6], 1);
buf[4*(i + 6*2)] = 0;
}
ptr += 18;
buf += 18;
buf += (j&3) != 3 ? 1 : (4*18-3);
}
/* zero bands */
for (j = sblimit; j < SBLIMIT; j++) {
/* overlap */
out_ptr = sb_samples + j;
for (i = 0; i < 18; i++) {
*out_ptr = buf[i];
buf[i] = 0;
*out_ptr = buf[4*i];
buf[4*i] = 0;
out_ptr += SBLIMIT;
}
buf += 18;
buf += (j&3) != 3 ? 1 : (4*18-3);
}
}

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