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Minor optimization

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This commit is contained in:
Henrik Rydgård 2024-05-03 08:38:50 +02:00
parent e263283bd3
commit ea3a4ed526
2 changed files with 4 additions and 14 deletions
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16
ext/at3_standalone/atrac3plus.cpp
View File

@ -815,16 +815,6 @@ static int decode_code_table_indexes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
return 0;
}
/**
* Clear high bits from an unsigned integer starting with specific bit position
* @param a value to clip
* @param p bit position to clip at
* @return clipped value
*/
inline unsigned av_mod_uintp2(unsigned a, unsigned p) {
return a & ((1 << p) - 1);
}
/**
* Decode huffman-coded spectral lines for a given quant unit.
*
@ -846,21 +836,21 @@ static void decode_qu_spectra(GetBitContext *gb, const Atrac3pSpecCodeTab *tab,
int bits = tab->bits;
int is_signed = tab->is_signed;
unsigned val;
const unsigned bitmask = ((1 << bits) - 1); // mask to clear higher bits.
for (pos = 0; pos < num_specs;) {
if (group_size == 1 || get_bits1(gb)) {
for (j = 0; j < group_size; j++) {
val = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1);
for (i = 0; i < num_coeffs; i++) {
cf = av_mod_uintp2(val, bits);
cf = val & bitmask;
if (is_signed)
cf = sign_extend(cf, bits);
else if (cf && get_bits1(gb))
cf = -cf;
out[pos++] = cf;
val >>= bits;
val >>= bits;
}
}
} else /* group skipped */

2
ext/at3_standalone/get_bits.cpp
View File

@ -87,7 +87,7 @@ static int alloc_table(VLC *vlc, int size, int use_static)
vlc->table_size = 0;
return AVERROR(ENOMEM);
}
memset(vlc->table + vlc->table_allocated - (1 << vlc->bits), 0, sizeof(VLC_TYPE) * 2 << vlc->bits);
memset(vlc->table + vlc->table_allocated - (unsigned int)(1UL << vlc->bits), 0, sizeof(VLC_TYPE) * 2 << vlc->bits);
}
return index;
}