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Refactor AAC unsigned band type decoding for a modest speedup.

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Originally committed as revision 17599 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse
2009-02-26 01:51:34 +00:00
parent 039821a838
commit 21e8c46cde
1 changed files with 8 additions and 8 deletions
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16
libavcodec/aac.c
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@ -805,14 +805,6 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
if (vq_ptr[2]) coef[coef_tmp_idx + 2] = sign_lookup[get_bits1(gb)]; if (vq_ptr[2]) coef[coef_tmp_idx + 2] = sign_lookup[get_bits1(gb)];
if (vq_ptr[3]) coef[coef_tmp_idx + 3] = sign_lookup[get_bits1(gb)]; if (vq_ptr[3]) coef[coef_tmp_idx + 3] = sign_lookup[get_bits1(gb)];
} }
}else {
coef[coef_tmp_idx ] = 1.0f;
coef[coef_tmp_idx + 1] = 1.0f;
if (dim == 4) {
coef[coef_tmp_idx + 2] = 1.0f;
coef[coef_tmp_idx + 3] = 1.0f;
}
}
if (cur_band_type == ESC_BT) { if (cur_band_type == ESC_BT) {
for (j = 0; j < 2; j++) { for (j = 0; j < 2; j++) {
if (vq_ptr[j] == 64.0f) { if (vq_ptr[j] == 64.0f) {
@ -838,6 +830,14 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
coef[coef_tmp_idx + 3] *= vq_ptr[3]; coef[coef_tmp_idx + 3] *= vq_ptr[3];
} }
} }
}else {
coef[coef_tmp_idx ] = vq_ptr[0];
coef[coef_tmp_idx + 1] = vq_ptr[1];
if (dim == 4) {
coef[coef_tmp_idx + 2] = vq_ptr[2];
coef[coef_tmp_idx + 3] = vq_ptr[3];
}
}
coef[coef_tmp_idx ] *= sf[idx]; coef[coef_tmp_idx ] *= sf[idx];
coef[coef_tmp_idx + 1] *= sf[idx]; coef[coef_tmp_idx + 1] *= sf[idx];
if (dim == 4) { if (dim == 4) {