mth/ebiten
1
0
Fork 0
mirror of https://github.com/hajimehoshi/ebiten.git synced 2024-12-24 10:48:53 +01:00
Code Issues Packages Projects Releases Wiki Activity

audio/mp3: Move Requantize_Process_Short to Go

Browse Source
This commit is contained in:
Hajime Hoshi 2017-06-16 22:26:18 +09:00
parent bf9a259565
commit 8e4abca1f8
3 changed files with 35 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
audio/mp3/l3.go
View File

@ -28,6 +28,34 @@ import (
"unsafe"
)
var powtab34 = make([]float64, 8207)
func init() {
for i := range powtab34 {
powtab34[i] = math.Pow(float64(i), 4.0/3.0)
}
}
func requantizeProcessShort(gr, ch, is_pos, sfb, win int) {
sf_mult := 0.5
if C.g_side_info.scalefac_scale[gr][ch] != 0 {
sf_mult = 1.0
}
tmp1 := 1.0
if sfb < 12 {
tmp1 = math.Pow(2.0, -(sf_mult * float64(C.g_main_data.scalefac_s[gr][ch][sfb][win])))
}
tmp2 := math.Pow(2.0, 0.25*(float64(C.g_side_info.global_gain[gr][ch])-210.0-
8.0*float64(C.g_side_info.subblock_gain[gr][ch][win])))
tmp3 := 0.0
if C.g_main_data.is[gr][ch][is_pos] < 0 {
tmp3 = -powtab34[int(-C.g_main_data.is[gr][ch][is_pos])]
} else {
tmp3 = powtab34[int(C.g_main_data.is[gr][ch][is_pos])]
}
C.g_main_data.is[gr][ch][is_pos] = C.float(tmp1 * tmp2 * tmp3)
}
type sfBandIndices struct {
l []int
s []int
@ -85,7 +113,7 @@ func L3_Requantize(gr C.unsigned, ch C.unsigned) {
}
for win := 0; win < 3; win++ {
for j := 0; j < win_len; j++ {
C.Requantize_Process_Short(gr, ch, C.unsigned(i), C.unsigned(sfb), C.unsigned(win))
requantizeProcessShort(int(gr), int(ch), i, sfb, win)
i++
}
}
@ -106,7 +134,7 @@ func L3_Requantize(gr C.unsigned, ch C.unsigned) {
}
for win := 0; win < 3; win++ {
for j := 0; j < win_len; j++ {
C.Requantize_Process_Short(gr, ch, C.unsigned(i), C.unsigned(sfb), C.unsigned(win))
requantizeProcessShort(int(gr), int(ch), i, sfb, win)
i++
} /* end for(j... */
}

22
audio/mp3/pdmp3.c
View File

@ -494,7 +494,11 @@ void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sf
sf_mult = g_side_info.scalefac_scale[gr][ch] ? 1.0 : 0.5;
pf_x_pt = g_side_info.preflag[gr][ch] * pretab[sfb];
if (sfb >= 21) {
tmp1 = 1.0;
} else {
tmp1 = pow(2.0,-(sf_mult *(g_main_data.scalefac_l[gr][ch][sfb] + pf_x_pt)));
}
tmp2 = pow(2.0,0.25 *((int32_t) g_side_info.global_gain[gr][ch] - 210));
if(g_main_data.is[gr][ch][is_pos] < 0.0)
tmp3 = -Requantize_Pow_43(-g_main_data.is[gr][ch][is_pos]);
@ -503,24 +507,6 @@ void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sf
return; /* Done */
}
/**Description: requantize sample in subband that uses short blocks.
* Parameters: TBD
* Return value: TBD
* Author: Krister Lagerström(krister@kmlager.com) **/
void Requantize_Process_Short(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb,unsigned win){
float res,tmp1,tmp2,tmp3,sf_mult;
sf_mult = g_side_info.scalefac_scale[gr][ch] ? 1.0f : 0.5f;
tmp1 = pow(2.0f,-(sf_mult * g_main_data.scalefac_s[gr][ch][sfb][win]));
tmp2 = pow(2.0f,0.25f *((float) g_side_info.global_gain[gr][ch] - 210.0f -
8.0f *(float) g_side_info.subblock_gain[gr][ch][win]));
tmp3 =(g_main_data.is[gr][ch][is_pos] < 0.0)
? -Requantize_Pow_43(-g_main_data.is[gr][ch][is_pos])
: Requantize_Pow_43(g_main_data.is[gr][ch][is_pos]);
res = g_main_data.is[gr][ch][is_pos] = tmp1 * tmp2 * tmp3;
return; /* Done */
}
/**Description: output audio data
* Parameters: Pointers to the samples,the number of samples
* Return value: None

1
audio/mp3/pdmp3.h
View File

@ -108,7 +108,6 @@ void L3_Frequency_Inversion(unsigned gr,unsigned ch);
void L3_Subband_Synthesis(unsigned gr,unsigned ch, unsigned* outdata);
void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb);
void Requantize_Process_Short(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb,unsigned win);
int Read_CRC(void);