mirror of https://git.ffmpeg.org/ffmpeg.git
Refactor AAC unsigned band type decoding for a modest speedup.
Originally committed as revision 17599 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -805,14 +805,6 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
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if (vq_ptr[2]) coef[coef_tmp_idx + 2] = sign_lookup[get_bits1(gb)];
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if (vq_ptr[3]) coef[coef_tmp_idx + 3] = sign_lookup[get_bits1(gb)];
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}
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}else {
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coef[coef_tmp_idx ] = 1.0f;
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coef[coef_tmp_idx + 1] = 1.0f;
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if (dim == 4) {
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coef[coef_tmp_idx + 2] = 1.0f;
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coef[coef_tmp_idx + 3] = 1.0f;
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}
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}
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if (cur_band_type == ESC_BT) {
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for (j = 0; j < 2; j++) {
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if (vq_ptr[j] == 64.0f) {
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@ -838,6 +830,14 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
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coef[coef_tmp_idx + 3] *= vq_ptr[3];
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}
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}
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}else {
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coef[coef_tmp_idx ] = vq_ptr[0];
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coef[coef_tmp_idx + 1] = vq_ptr[1];
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if (dim == 4) {
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coef[coef_tmp_idx + 2] = vq_ptr[2];
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coef[coef_tmp_idx + 3] = vq_ptr[3];
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}
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}
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coef[coef_tmp_idx ] *= sf[idx];
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coef[coef_tmp_idx + 1] *= sf[idx];
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if (dim == 4) {
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