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audio/mp3: Refactoring

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This commit is contained in:
Hajime Hoshi 2017-06-17 06:43:50 +09:00
parent e53d5920b0
commit 02e284ea9d
3 changed files with 14 additions and 28 deletions
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15
audio/mp3/decode_notjs.go
View File

@ -41,22 +41,23 @@ var (
func decodeL3() error {
out := make([]int, 576)
/* Number of channels(1 for mono and 2 for stereo) */
// Number of channels(1 for mono and 2 for stereo)
nch := 2
if C.g_frame_header.mode == C.mpeg1_mode_single_channel {
nch = 1
}
for gr := 0; gr < 2; gr++ {
for ch := 0; ch < nch; ch++ {
L3_Requantize(C.uint(gr), C.uint(ch)) /* Requantize samples */
L3_Reorder(C.uint(gr), C.uint(ch)) /* Reorder short blocks */
l3Requantize(gr, ch)
// Reorder short blocks
l3Reorder(gr, ch)
}
L3_Stereo(C.uint(gr)) /* Stereo processing */
l3Stereo(gr)
for ch := 0; ch < nch; ch++ {
L3_Antialias(C.uint(gr), C.uint(ch))
l3Antialias(gr, ch)
// (IMDCT,windowing,overlapp add)
L3_Hybrid_Synthesis(C.uint(gr), C.uint(ch))
L3_Frequency_Inversion(C.uint(gr), C.uint(ch))
l3HybridSynthesis(gr, ch)
l3FrequencyInversion(gr, ch)
// Polyphase subband synthesis
l3SubbandSynthesis(gr, ch, out)
}

18
audio/mp3/l3.go
View File

@ -102,8 +102,7 @@ var (
}
)
//export L3_Requantize
func L3_Requantize(gr C.unsigned, ch C.unsigned) {
func l3Requantize(gr int, ch int) {
/* Setup sampling frequency index */
sfreq := C.g_frame_header.sampling_frequency
/* Determine type of block to process */
@ -177,8 +176,7 @@ func L3_Requantize(gr C.unsigned, ch C.unsigned) {
}
}
//export L3_Reorder
func L3_Reorder(gr C.unsigned, ch C.unsigned) {
func l3Reorder(gr int, ch int) {
re := make([]float32, 576)
sfreq := C.g_frame_header.sampling_frequency /* Setup sampling freq index */
@ -284,8 +282,7 @@ func stereoProcessIntensityShort(gr int, sfb int) {
}
}
//export L3_Stereo
func L3_Stereo(gr C.unsigned) {
func l3Stereo(gr int) {
/* Do nothing if joint stereo is not enabled */
if (C.g_frame_header.mode != 1) || (C.g_frame_header.mode_extension == 0) {
return
@ -358,8 +355,7 @@ var (
ca = [8]float32{-0.514496, -0.471732, -0.313377, -0.181913, -0.094574, -0.040966, -0.014199, -0.003700}
)
//export L3_Antialias
func L3_Antialias(gr C.unsigned, ch C.unsigned) {
func l3Antialias(gr int, ch int) {
/* No antialiasing is done for short blocks */
if (C.g_side_info.win_switch_flag[gr][ch] == 1) &&
(C.g_side_info.block_type[gr][ch] == 2) &&
@ -388,8 +384,7 @@ func L3_Antialias(gr C.unsigned, ch C.unsigned) {
var store = [2][32][18]float32{}
//export L3_Hybrid_Synthesis
func L3_Hybrid_Synthesis(gr C.unsigned, ch C.unsigned) {
func l3HybridSynthesis(gr int, ch int) {
for sb := 0; sb < 32; sb++ { /* Loop through all 32 subbands */
/* Determine blocktype for this subband */
bt := int(C.g_side_info.block_type[gr][ch])
@ -410,8 +405,7 @@ func L3_Hybrid_Synthesis(gr C.unsigned, ch C.unsigned) {
}
}
//export L3_Frequency_Inversion
func L3_Frequency_Inversion(gr C.unsigned, ch C.unsigned) {
func l3FrequencyInversion(gr int, ch int) {
for sb := 1; sb < 32; sb += 2 { //OPT? : for(sb = 18; sb < 576; sb += 36)
for i := 1; i < 18; i += 2 {
C.g_main_data.is[gr][ch][sb*18+i] = -C.g_main_data.is[gr][ch][sb*18+i]

9
audio/mp3/pdmp3.h
View File

@ -89,13 +89,4 @@ unsigned Get_Filepos(void);
unsigned Get_Main_Pos(void);
int Set_Main_Pos(unsigned bit_pos);
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);
void L3_Hybrid_Synthesis(unsigned gr,unsigned ch);
void L3_Frequency_Inversion(unsigned gr,unsigned ch);
int Read_CRC(void);
#endif