/**
* Also counts the number of bits to encode the scalefacs but for MPEG 2 Lower sampling
* frequencies (24, 22.05 and 16 kHz.)
*
* <p>This is reverse-engineered from section 2.4.3.2 of the MPEG2 IS, "Audio Decoding Layer III"
*/
public boolean scale_bitcount_lsf(final LameInternalFlags gfc, final GrInfo cod_info) {
int table_number, row_in_table, partition, nr_sfb, window;
boolean over;
int i, sfb, max_sfac[] = new int[4];
final int[] partition_table;
final int[] scalefac = cod_info.scalefac;
/*
* Set partition table. Note that should try to use table one, but do
* not yet...
*/
if (cod_info.preflag != 0) table_number = 2;
else table_number = 0;
for (i = 0; i < 4; i++) max_sfac[i] = 0;
if (cod_info.block_type == Encoder.SHORT_TYPE) {
row_in_table = 1;
partition_table = qupvt.nr_of_sfb_block[table_number][row_in_table];
for (sfb = 0, partition = 0; partition < 4; partition++) {
nr_sfb = partition_table[partition] / 3;
for (i = 0; i < nr_sfb; i++, sfb++)
for (window = 0; window < 3; window++)
if (scalefac[sfb * 3 + window] > max_sfac[partition])
max_sfac[partition] = scalefac[sfb * 3 + window];
}
} else {
row_in_table = 0;
partition_table = qupvt.nr_of_sfb_block[table_number][row_in_table];
for (sfb = 0, partition = 0; partition < 4; partition++) {
nr_sfb = partition_table[partition];
for (i = 0; i < nr_sfb; i++, sfb++)
if (scalefac[sfb] > max_sfac[partition]) max_sfac[partition] = scalefac[sfb];
}
}
for (over = false, partition = 0; partition < 4; partition++) {
if (max_sfac[partition] > max_range_sfac_tab[table_number][partition]) over = true;
}
if (!over) {
int slen1, slen2, slen3, slen4;
cod_info.sfb_partition_table = qupvt.nr_of_sfb_block[table_number][row_in_table];
for (partition = 0; partition < 4; partition++)
cod_info.slen[partition] = log2tab[max_sfac[partition]];
/* set scalefac_compress */
slen1 = cod_info.slen[0];
slen2 = cod_info.slen[1];
slen3 = cod_info.slen[2];
slen4 = cod_info.slen[3];
switch (table_number) {
case 0:
cod_info.scalefac_compress = (((slen1 * 5) + slen2) << 4) + (slen3 << 2) + slen4;
break;
case 1:
cod_info.scalefac_compress = 400 + (((slen1 * 5) + slen2) << 2) + slen3;
break;
case 2:
cod_info.scalefac_compress = 500 + (slen1 * 3) + slen2;
break;
default:
System.err.printf("intensity stereo not implemented yet\n");
break;
}
}
if (!over) {
assert (cod_info.sfb_partition_table != null);
cod_info.part2_length = 0;
for (partition = 0; partition < 4; partition++)
cod_info.part2_length += cod_info.slen[partition] * cod_info.sfb_partition_table[partition];
}
return over;
}
