internal int outer_loop(
LameGlobalFlags gfp,
GrInfo cod_info,
float[] l3_xmin,
float[] xrpow,
int ch,
int targ_bits)
{
var gfc = gfp.internal_flags;
var cod_info_w = new GrInfo();
var save_xrpow = new float[576];
var distort = new float[L3Side.SFBMAX];
var best_noise_info = new CalcNoiseResult();
int better;
var prev_noise = new CalcNoiseData();
var best_part2_3_length = 9999999;
var bEndOfSearch = false;
var bRefine = false;
var best_ggain_pass1 = 0;
bin_search_StepSize(gfc, cod_info, targ_bits, ch, xrpow);
if (0 == gfc.noise_shaping)
{
return(100);
}
qupvt.calc_noise(cod_info, l3_xmin, distort, best_noise_info, prev_noise);
best_noise_info.bits = cod_info.part2_3_length;
cod_info_w.assign(cod_info);
var age = 0;
Array.Copy(xrpow, 0, save_xrpow, 0, 576);
while (!bEndOfSearch)
{
do
{
var noise_info = new CalcNoiseResult();
int search_limit;
var maxggain = 255;
if ((gfc.substep_shaping & 2) != 0)
{
search_limit = 20;
}
else
{
search_limit = 3;
}
if (gfc.sfb21_extra)
{
if (distort[cod_info_w.sfbmax] > 1.0)
{
break;
}
if (cod_info_w.block_type == Encoder.SHORT_TYPE &&
(distort[cod_info_w.sfbmax + 1] > 1.0 || distort[cod_info_w.sfbmax + 2] > 1.0))
{
break;
}
}
if (!balance_noise(gfp, cod_info_w, distort, xrpow, bRefine))
{
break;
}
if (cod_info_w.scalefac_scale != 0)
{
maxggain = 254;
}
var huff_bits = targ_bits - cod_info_w.part2_length;
if (huff_bits <= 0)
{
break;
}
while ((cod_info_w.part2_3_length = tk.count_bits(gfc, xrpow, cod_info_w, prev_noise)) >
huff_bits && cod_info_w.global_gain <= maxggain)
{
cod_info_w.global_gain++;
}
if (cod_info_w.global_gain > maxggain)
{
break;
}
if (best_noise_info.over_count == 0)
{
while ((cod_info_w.part2_3_length = tk.count_bits(gfc, xrpow, cod_info_w, prev_noise)) >
best_part2_3_length && cod_info_w.global_gain <= maxggain)
{
cod_info_w.global_gain++;
}
if (cod_info_w.global_gain > maxggain)
{
break;
}
}
qupvt.calc_noise(cod_info_w, l3_xmin, distort, noise_info, prev_noise);
noise_info.bits = cod_info_w.part2_3_length;
if (cod_info.block_type != Encoder.SHORT_TYPE)
{
better = gfp.quant_comp;
}
else
{
better = gfp.quant_comp_short;
}
better = quant_compare(better, best_noise_info, noise_info, cod_info_w, distort) ? 1 : 0;
if (better != 0)
{
best_part2_3_length = cod_info.part2_3_length;
best_noise_info = noise_info;
cod_info.assign(cod_info_w);
age = 0;
Array.Copy(xrpow, 0, save_xrpow, 0, 576);
}
else
{
if (gfc.full_outer_loop == 0)
{
if (++age > search_limit && best_noise_info.over_count == 0)
{
break;
}
if (gfc.noise_shaping_amp == 3 && bRefine && age > 30)
{
break;
}
if (gfc.noise_shaping_amp == 3 && bRefine &&
cod_info_w.global_gain - best_ggain_pass1 > 15)
{
break;
}
}
}
}while (cod_info_w.global_gain + cod_info_w.scalefac_scale < 255);
if (gfc.noise_shaping_amp == 3)
{
if (!bRefine)
{
cod_info_w.assign(cod_info);
Array.Copy(save_xrpow, 0, xrpow, 0, 576);
age = 0;
best_ggain_pass1 = cod_info_w.global_gain;
bRefine = true;
}
else
{
bEndOfSearch = true;
}
}
else
{
bEndOfSearch = true;
}
}
Debug.Assert(cod_info.global_gain + cod_info.scalefac_scale <= 255);
if (gfp.VBR == VbrMode.vbr_rh || gfp.VBR == VbrMode.vbr_mtrh)
{
Array.Copy(save_xrpow, 0, xrpow, 0, 576);
}
else if ((gfc.substep_shaping & 1) != 0)
{
trancate_smallspectrums(gfc, cod_info, l3_xmin, xrpow);
}
return(best_noise_info.over_count);
}
internal int calc_noise(
GrInfo cod_info,
float[] l3_xmin,
float[] distort,
CalcNoiseResult res,
CalcNoiseData prev_noise)
{
var distortPos = 0;
var l3_xminPos = 0;
int sfb, l, over = 0;
float over_noise_db = 0;
float tot_noise_db = 0;
var max_noise = -20.0f;
var j = 0;
var scalefac = cod_info.scalefac;
var scalefacPos = 0;
res.over_SSD = 0;
for (sfb = 0; sfb < cod_info.psymax; sfb++)
{
var s = cod_info.global_gain -
((scalefac[scalefacPos++] + (cod_info.preflag != 0 ? pretab[sfb] : 0)) <<
(cod_info.scalefac_scale + 1)) - cod_info.subblock_gain[cod_info.window[sfb]] * 8;
var noise = 0.0f;
if (prev_noise != null && prev_noise.step[sfb] == s)
{
noise = prev_noise.noise[sfb];
j += cod_info.width[sfb];
distort[distortPos++] = noise / l3_xmin[l3_xminPos++];
noise = prev_noise.noise_log[sfb];
}
else
{
var step = POW20(s);
l = cod_info.width[sfb] >> 1;
if (j + cod_info.width[sfb] > cod_info.max_nonzero_coeff)
{
int usefullsize;
usefullsize = cod_info.max_nonzero_coeff - j + 1;
if (usefullsize > 0)
{
l = usefullsize >> 1;
}
else
{
l = 0;
}
}
var sl = new StartLine(j);
noise = calc_noise_core(cod_info, sl, l, step);
j = sl.s;
if (prev_noise != null)
{
prev_noise.step[sfb] = s;
prev_noise.noise[sfb] = noise;
}
noise = distort[distortPos++] = noise / l3_xmin[l3_xminPos++];
noise = Util.FAST_LOG10((float)Math.Max(noise, 1E-20));
if (prev_noise != null)
{
prev_noise.noise_log[sfb] = noise;
}
}
if (prev_noise != null)
{
prev_noise.global_gain = cod_info.global_gain;
}
tot_noise_db += noise;
if (noise > 0.0)
{
int tmp;
tmp = Math.Max((int)(noise * 10 + .5), 1);
res.over_SSD += tmp * tmp;
over++;
over_noise_db += noise;
}
max_noise = Math.Max(max_noise, noise);
}
res.over_count = over;
res.tot_noise = tot_noise_db;
res.over_noise = over_noise_db;
res.max_noise = max_noise;
return(over);
}