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audio/mp3: Move L3_Requantize to Go

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This commit is contained in:
Hajime Hoshi 2017-06-16 16:43:45 +09:00
parent c96b54dbfb
commit 74c2953f56
3 changed files with 81 additions and 87 deletions
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75
audio/mp3/l3.go
View File

@ -50,6 +50,81 @@ var (
}
)
//export L3_Requantize
func L3_Requantize(gr C.unsigned, ch C.unsigned) {
/* Setup sampling frequency index */
sfreq := C.g_frame_header.sampling_frequency
/* Determine type of block to process */
if (C.g_side_info.win_switch_flag[gr][ch] == 1) && (C.g_side_info.block_type[gr][ch] == 2) { /* Short blocks */
/* Check if the first two subbands
*(=2*18 samples = 8 long or 3 short sfb's) uses long blocks */
if C.g_side_info.mixed_block_flag[gr][ch] != 0 { /* 2 longbl. sb first */
/* First process the 2 long block subbands at the start */
sfb := 0
next_sfb := sfBandIndicesSet[sfreq].l[sfb+1]
for i := 0; i < 36; i++ {
if i == next_sfb {
sfb++
next_sfb = sfBandIndicesSet[sfreq].l[sfb+1]
} /* end if */
C.Requantize_Process_Long(gr, ch, C.unsigned(i), C.unsigned(sfb))
}
/* And next the remaining,non-zero,bands which uses short blocks */
sfb = 3
next_sfb = sfBandIndicesSet[sfreq].s[sfb+1] * 3
win_len := sfBandIndicesSet[sfreq].s[sfb+1] -
sfBandIndicesSet[sfreq].s[sfb]
for i := 36; i < int(C.g_side_info.count1[gr][ch]); /* i++ done below! */ {
/* Check if we're into the next scalefac band */
if i == next_sfb { /* Yes */
sfb++
next_sfb = sfBandIndicesSet[sfreq].s[sfb+1] * 3
win_len = sfBandIndicesSet[sfreq].s[sfb+1] -
sfBandIndicesSet[sfreq].s[sfb]
}
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))
i++
}
}
}
} else { /* Only short blocks */
sfb := 0
next_sfb := sfBandIndicesSet[sfreq].s[sfb+1] * 3
win_len := sfBandIndicesSet[sfreq].s[sfb+1] -
sfBandIndicesSet[sfreq].s[sfb]
for i := 0; i < int(C.g_side_info.count1[gr][ch]); /* i++ done below! */ {
/* Check if we're into the next scalefac band */
if i == next_sfb { /* Yes */
sfb++
next_sfb = sfBandIndicesSet[sfreq].s[sfb+1] * 3
win_len = sfBandIndicesSet[sfreq].s[sfb+1] -
sfBandIndicesSet[sfreq].s[sfb]
}
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))
i++
} /* end for(j... */
}
}
}
} else { /* Only long blocks */
sfb := 0
next_sfb := sfBandIndicesSet[sfreq].l[sfb+1]
for i := 0; i < int(C.g_side_info.count1[gr][ch]); i++ {
if i == next_sfb {
sfb++
next_sfb = sfBandIndicesSet[sfreq].l[sfb+1]
} /* end if */
C.Requantize_Process_Long(gr, ch, C.unsigned(i), C.unsigned(sfb))
}
}
}
//export L3_Reorder
func L3_Reorder(gr C.unsigned, ch C.unsigned) {
re := make([]float32, 576)

89
audio/mp3/pdmp3.c
View File

@ -44,10 +44,7 @@ static void audio_write(unsigned *samples,unsigned nsamples,int sample_rate);
static void audio_write_raw(unsigned *samples,unsigned nsamples);
static void Decode_L3_Init_Song(void);
static void Error(const char *s,int e);
static void L3_Requantize(unsigned gr,unsigned ch);
static void Read_Ancillary(void);
static void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb);
static void Requantize_Process_Short(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb,unsigned win);
static const unsigned g_mpeg1_bitrates[3 /* layer 1-3 */][15 /* header bitrate_index */] = {
{ /* Layer 1 */
@ -417,88 +414,6 @@ static void Decode_L3_Init_Song(void){
synth_init = 1;
}
/**Description: TBD
* Parameters: TBD
* Return value: TBD
* Author: Krister Lagerström(krister@kmlager.com) **/
static void L3_Requantize(unsigned gr,unsigned ch){
unsigned sfb /* scalefac band index */,next_sfb /* frequency of next sfb */,
sfreq,i,j,win,win_len;
/* Setup sampling frequency index */
sfreq = g_frame_header.sampling_frequency;
/* Determine type of block to process */
if((g_side_info.win_switch_flag[gr][ch] == 1) && (g_side_info.block_type[gr][ch] == 2)) { /* Short blocks */
/* Check if the first two subbands
*(=2*18 samples = 8 long or 3 short sfb's) uses long blocks */
if(g_side_info.mixed_block_flag[gr][ch] != 0) { /* 2 longbl. sb first */
/* First process the 2 long block subbands at the start */
sfb = 0;
next_sfb = g_sf_band_indices[sfreq].l[sfb+1];
for(i = 0; i < 36; i++) {
if(i == next_sfb) {
sfb++;
next_sfb = g_sf_band_indices[sfreq].l[sfb+1];
} /* end if */
Requantize_Process_Long(gr,ch,i,sfb);
}
/* And next the remaining,non-zero,bands which uses short blocks */
sfb = 3;
next_sfb = g_sf_band_indices[sfreq].s[sfb+1] * 3;
win_len = g_sf_band_indices[sfreq].s[sfb+1] -
g_sf_band_indices[sfreq].s[sfb];
for(i = 36; i < g_side_info.count1[gr][ch]; /* i++ done below! */) {
/* Check if we're into the next scalefac band */
if(i == next_sfb) { /* Yes */
sfb++;
next_sfb = g_sf_band_indices[sfreq].s[sfb+1] * 3;
win_len = g_sf_band_indices[sfreq].s[sfb+1] -
g_sf_band_indices[sfreq].s[sfb];
} /* end if(next_sfb) */
for(win = 0; win < 3; win++) {
for(j = 0; j < win_len; j++) {
Requantize_Process_Short(gr,ch,i,sfb,win);
i++;
} /* end for(j... */
} /* end for(win... */
} /* end for(i... */
}else{ /* Only short blocks */
sfb = 0;
next_sfb = g_sf_band_indices[sfreq].s[sfb+1] * 3;
win_len = g_sf_band_indices[sfreq].s[sfb+1] -
g_sf_band_indices[sfreq].s[sfb];
for(i = 0; i < g_side_info.count1[gr][ch]; /* i++ done below! */) {
/* Check if we're into the next scalefac band */
if(i == next_sfb) { /* Yes */
sfb++;
next_sfb = g_sf_band_indices[sfreq].s[sfb+1] * 3;
win_len = g_sf_band_indices[sfreq].s[sfb+1] -
g_sf_band_indices[sfreq].s[sfb];
} /* end if(next_sfb) */
for(win = 0; win < 3; win++) {
for(j = 0; j < win_len; j++) {
Requantize_Process_Short(gr,ch,i,sfb,win);
i++;
} /* end for(j... */
} /* end for(win... */
} /* end for(i... */
} /* end else(only short blocks) */
}else{ /* Only long blocks */
sfb = 0;
next_sfb = g_sf_band_indices[sfreq].l[sfb+1];
for(i = 0; i < g_side_info.count1[gr][ch]; i++) {
if(i == next_sfb) {
sfb++;
next_sfb = g_sf_band_indices[sfreq].l[sfb+1];
} /* end if */
Requantize_Process_Long(gr,ch,i,sfb);
}
} /* end else(only long blocks) */
return; /* Done */
}
/**Description: called by Read_Main_L3 to read Huffman coded data from bitstream.
* Parameters: None
* Return value: None. The data is stored in g_main_data.is[ch][gr][freqline].
@ -573,7 +488,7 @@ void Read_Huffman(unsigned part_2_start,unsigned gr,unsigned ch){
* Parameters: TBD
* Return value: TBD
* Author: Krister Lagerström(krister@kmlager.com) **/
static void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb){
void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb){
float res,tmp1,tmp2,tmp3,sf_mult,pf_x_pt;
static float pretab[21] = { 0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2 };
@ -592,7 +507,7 @@ static void Requantize_Process_Long(unsigned gr,unsigned ch,unsigned is_pos,unsi
* Parameters: TBD
* Return value: TBD
* Author: Krister Lagerström(krister@kmlager.com) **/
static void Requantize_Process_Short(unsigned gr,unsigned ch,unsigned is_pos,unsigned sfb,unsigned win){
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;

4
audio/mp3/pdmp3.h
View File

@ -99,6 +99,7 @@ int Read_Audio_L3(void);
static int Read_Header(void);
void Read_Huffman(unsigned part_2_start,unsigned gr,unsigned ch);
void L3_Requantize(unsigned gr,unsigned ch);
void L3_Reorder(unsigned gr,unsigned ch);
void L3_Stereo(unsigned gr);
void L3_Antialias(unsigned gr,unsigned ch);
@ -106,6 +107,9 @@ void L3_Hybrid_Synthesis(unsigned gr,unsigned ch);
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);
int Huffman_Decode(unsigned table_num, int32_t* x, int32_t*y, int32_t* v, int32_t* w);