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audio/mp3: Move t_mpeg1_main_data to Go

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This commit is contained in:
Hajime Hoshi 2017-06-17 07:13:11 +09:00
parent 408b37dd7a
commit d30f025d85
6 changed files with 140 additions and 86 deletions
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63
audio/mp3/l3.go
View File

@ -18,7 +18,6 @@ package mp3
// #include "pdmp3.h" // #include "pdmp3.h"
// //
// extern t_mpeg1_main_data g_main_data;
// extern t_mpeg1_side_info g_side_info; // extern t_mpeg1_side_info g_side_info;
// extern t_mpeg1_header g_frame_header; // extern t_mpeg1_header g_frame_header;
import "C" import "C"
@ -47,16 +46,16 @@ func requantizeProcessLong(gr, ch, is_pos, sfb int) {
// https://github.com/technosaurus/PDMP3/issues/4 // https://github.com/technosaurus/PDMP3/issues/4
if sfb < 21 { if sfb < 21 {
pf_x_pt := float64(C.g_side_info.preflag[gr][ch]) * pretab[sfb] pf_x_pt := float64(C.g_side_info.preflag[gr][ch]) * pretab[sfb]
tmp1 = math.Pow(2.0, -(sf_mult * (float64(C.g_main_data.scalefac_l[gr][ch][sfb]) + pf_x_pt))) tmp1 = math.Pow(2.0, -(sf_mult * (float64(theMPEG1MainData.scalefac_l[gr][ch][sfb]) + pf_x_pt)))
} }
tmp2 := math.Pow(2.0, 0.25*(float64(C.g_side_info.global_gain[gr][ch])-210)) tmp2 := math.Pow(2.0, 0.25*(float64(C.g_side_info.global_gain[gr][ch])-210))
tmp3 := 0.0 tmp3 := 0.0
if C.g_main_data.is[gr][ch][is_pos] < 0.0 { if theMPEG1MainData.is[gr][ch][is_pos] < 0.0 {
tmp3 = -powtab34[int(-C.g_main_data.is[gr][ch][is_pos])] tmp3 = -powtab34[int(-theMPEG1MainData.is[gr][ch][is_pos])]
} else { } else {
tmp3 = powtab34[int(C.g_main_data.is[gr][ch][is_pos])] tmp3 = powtab34[int(theMPEG1MainData.is[gr][ch][is_pos])]
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(tmp1 * tmp2 * tmp3) theMPEG1MainData.is[gr][ch][is_pos] = float32(tmp1 * tmp2 * tmp3)
} }
func requantizeProcessShort(gr, ch, is_pos, sfb, win int) { func requantizeProcessShort(gr, ch, is_pos, sfb, win int) {
@ -67,17 +66,17 @@ func requantizeProcessShort(gr, ch, is_pos, sfb, win int) {
tmp1 := 1.0 tmp1 := 1.0
// https://github.com/technosaurus/PDMP3/issues/4 // https://github.com/technosaurus/PDMP3/issues/4
if sfb < 12 { if sfb < 12 {
tmp1 = math.Pow(2.0, -(sf_mult * float64(C.g_main_data.scalefac_s[gr][ch][sfb][win]))) tmp1 = math.Pow(2.0, -(sf_mult * float64(theMPEG1MainData.scalefac_s[gr][ch][sfb][win])))
} }
tmp2 := math.Pow(2.0, 0.25*(float64(C.g_side_info.global_gain[gr][ch])-210.0- 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]))) 8.0*float64(C.g_side_info.subblock_gain[gr][ch][win])))
tmp3 := 0.0 tmp3 := 0.0
if C.g_main_data.is[gr][ch][is_pos] < 0 { if theMPEG1MainData.is[gr][ch][is_pos] < 0 {
tmp3 = -powtab34[int(-C.g_main_data.is[gr][ch][is_pos])] tmp3 = -powtab34[int(-theMPEG1MainData.is[gr][ch][is_pos])]
} else { } else {
tmp3 = powtab34[int(C.g_main_data.is[gr][ch][is_pos])] tmp3 = powtab34[int(theMPEG1MainData.is[gr][ch][is_pos])]
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(tmp1 * tmp2 * tmp3) theMPEG1MainData.is[gr][ch][is_pos] = float32(tmp1 * tmp2 * tmp3)
} }
type sfBandIndices struct { type sfBandIndices struct {
@ -200,7 +199,7 @@ func l3Reorder(gr int, ch int) {
if i == next_sfb { if i == next_sfb {
/* Copy reordered data back to the original vector */ /* Copy reordered data back to the original vector */
for j := 0; j < 3*win_len; j++ { for j := 0; j < 3*win_len; j++ {
C.g_main_data.is[gr][ch][3*sfBandIndicesSet[sfreq].s[sfb]+j] = C.float(re[j]) theMPEG1MainData.is[gr][ch][3*sfBandIndicesSet[sfreq].s[sfb]+j] = re[j]
} }
/* Check if this band is above the rzero region,if so we're done */ /* Check if this band is above the rzero region,if so we're done */
if C.uint(i) >= C.g_side_info.count1[gr][ch] { if C.uint(i) >= C.g_side_info.count1[gr][ch] {
@ -212,14 +211,14 @@ func l3Reorder(gr int, ch int) {
} }
for win := 0; win < 3; win++ { /* Do the actual reordering */ for win := 0; win < 3; win++ { /* Do the actual reordering */
for j := 0; j < win_len; j++ { for j := 0; j < win_len; j++ {
re[j*3+win] = float32(C.g_main_data.is[gr][ch][i]) re[j*3+win] = float32(theMPEG1MainData.is[gr][ch][i])
i++ i++
} }
} }
} }
/* Copy reordered data of last band back to original vector */ /* Copy reordered data of last band back to original vector */
for j := 0; j < 3*win_len; j++ { for j := 0; j < 3*win_len; j++ {
C.g_main_data.is[gr][ch][3*sfBandIndicesSet[sfreq].s[12]+j] = C.float(re[j]) theMPEG1MainData.is[gr][ch][3*sfBandIndicesSet[sfreq].s[12]+j] = re[j]
} }
} }
} }
@ -232,7 +231,7 @@ func stereoProcessIntensityLong(gr int, sfb int) {
is_ratio_l := float32(0) is_ratio_l := float32(0)
is_ratio_r := float32(0) is_ratio_r := float32(0)
/* Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo */ /* Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo */
is_pos := C.g_main_data.scalefac_l[gr][0][sfb] is_pos := theMPEG1MainData.scalefac_l[gr][0][sfb]
if is_pos != 7 { if is_pos != 7 {
sfreq := C.g_frame_header.sampling_frequency /* Setup sampling freq index */ sfreq := C.g_frame_header.sampling_frequency /* Setup sampling freq index */
sfb_start := sfBandIndicesSet[sfreq].l[sfb] sfb_start := sfBandIndicesSet[sfreq].l[sfb]
@ -246,8 +245,8 @@ func stereoProcessIntensityLong(gr int, sfb int) {
} }
/* Now decode all samples in this scale factor band */ /* Now decode all samples in this scale factor band */
for i := sfb_start; i < sfb_stop; i++ { for i := sfb_start; i < sfb_stop; i++ {
C.g_main_data.is[gr][0][i] *= C.float(is_ratio_l) theMPEG1MainData.is[gr][0][i] *= is_ratio_l
C.g_main_data.is[gr][1][i] *= C.float(is_ratio_r) theMPEG1MainData.is[gr][1][i] *= is_ratio_r
} }
} }
} }
@ -261,7 +260,7 @@ func stereoProcessIntensityShort(gr int, sfb int) {
/* The three windows within the band has different scalefactors */ /* The three windows within the band has different scalefactors */
for win := 0; win < 3; win++ { for win := 0; win < 3; win++ {
/* Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo */ /* Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo */
is_pos := C.g_main_data.scalefac_s[gr][0][sfb][win] is_pos := theMPEG1MainData.scalefac_s[gr][0][sfb][win]
if is_pos != 7 { if is_pos != 7 {
sfb_start := sfBandIndicesSet[sfreq].s[sfb]*3 + win_len*win sfb_start := sfBandIndicesSet[sfreq].s[sfb]*3 + win_len*win
sfb_stop := sfb_start + win_len sfb_stop := sfb_start + win_len
@ -275,8 +274,8 @@ func stereoProcessIntensityShort(gr int, sfb int) {
/* Now decode all samples in this scale factor band */ /* Now decode all samples in this scale factor band */
for i := sfb_start; i < sfb_stop; i++ { for i := sfb_start; i < sfb_stop; i++ {
// https://github.com/technosaurus/PDMP3/issues/3 // https://github.com/technosaurus/PDMP3/issues/3
C.g_main_data.is[gr][0][i] *= C.float(is_ratio_l) theMPEG1MainData.is[gr][0][i] *= is_ratio_l
C.g_main_data.is[gr][1][i] *= C.float(is_ratio_r) theMPEG1MainData.is[gr][1][i] *= is_ratio_r
} }
} }
} }
@ -298,10 +297,10 @@ func l3Stereo(gr int) {
/* Do the actual processing */ /* Do the actual processing */
const invSqrt2 = math.Sqrt2 / 2 const invSqrt2 = math.Sqrt2 / 2
for i := 0; i < max_pos; i++ { for i := 0; i < max_pos; i++ {
left := (C.g_main_data.is[gr][0][i] + C.g_main_data.is[gr][1][i]) * invSqrt2 left := (theMPEG1MainData.is[gr][0][i] + theMPEG1MainData.is[gr][1][i]) * invSqrt2
right := (C.g_main_data.is[gr][0][i] - C.g_main_data.is[gr][1][i]) * invSqrt2 right := (theMPEG1MainData.is[gr][0][i] - theMPEG1MainData.is[gr][1][i]) * invSqrt2
C.g_main_data.is[gr][0][i] = left theMPEG1MainData.is[gr][0][i] = left
C.g_main_data.is[gr][1][i] = right theMPEG1MainData.is[gr][1][i] = right
} }
} }
/* Do intensity stereo processing */ /* Do intensity stereo processing */
@ -374,10 +373,10 @@ func l3Antialias(gr int, ch int) {
for i := 0; i < 8; i++ { for i := 0; i < 8; i++ {
li := 18*sb - 1 - i li := 18*sb - 1 - i
ui := 18*sb + i ui := 18*sb + i
lb := C.g_main_data.is[gr][ch][li]*C.float(cs[i]) - C.g_main_data.is[gr][ch][ui]*C.float(ca[i]) lb := theMPEG1MainData.is[gr][ch][li]*cs[i] - theMPEG1MainData.is[gr][ch][ui]*ca[i]
ub := C.g_main_data.is[gr][ch][ui]*C.float(cs[i]) + C.g_main_data.is[gr][ch][li]*C.float(ca[i]) ub := theMPEG1MainData.is[gr][ch][ui]*cs[i] + theMPEG1MainData.is[gr][ch][li]*ca[i]
C.g_main_data.is[gr][ch][li] = lb theMPEG1MainData.is[gr][ch][li] = lb
C.g_main_data.is[gr][ch][ui] = ub theMPEG1MainData.is[gr][ch][ui] = ub
} }
} }
} }
@ -395,11 +394,11 @@ func l3HybridSynthesis(gr int, ch int) {
/* Do the inverse modified DCT and windowing */ /* Do the inverse modified DCT and windowing */
in := make([]float32, 18) in := make([]float32, 18)
for i := range in { for i := range in {
in[i] = float32(C.g_main_data.is[gr][ch][sb*18+i]) in[i] = float32(theMPEG1MainData.is[gr][ch][sb*18+i])
} }
rawout := imdctWin(in, bt) rawout := imdctWin(in, bt)
for i := 0; i < 18; i++ { /* Overlapp add with stored vector into main_data vector */ for i := 0; i < 18; i++ { /* Overlapp add with stored vector into main_data vector */
C.g_main_data.is[gr][ch][sb*18+i] = C.float(rawout[i] + store[ch][sb][i]) theMPEG1MainData.is[gr][ch][sb*18+i] = rawout[i] + store[ch][sb][i]
store[ch][sb][i] = rawout[i+18] store[ch][sb][i] = rawout[i+18]
} }
} }
@ -408,7 +407,7 @@ func l3HybridSynthesis(gr int, ch int) {
func l3FrequencyInversion(gr int, ch int) { func l3FrequencyInversion(gr int, ch int) {
for sb := 1; sb < 32; sb += 2 { //OPT? : for(sb = 18; sb < 576; sb += 36) for sb := 1; sb < 32; sb += 2 { //OPT? : for(sb = 18; sb < 576; sb += 36)
for i := 1; i < 18; i += 2 { 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] theMPEG1MainData.is[gr][ch][sb*18+i] = -theMPEG1MainData.is[gr][ch][sb*18+i]
} }
} }
} }
@ -573,7 +572,7 @@ func l3SubbandSynthesis(gr int, ch int, out []uint32) {
v_vec[ch][i] = v_vec[ch][i-64] v_vec[ch][i] = v_vec[ch][i-64]
} }
for i := 0; i < 32; i++ { /* Copy next 32 time samples to a temp vector */ for i := 0; i < 32; i++ { /* Copy next 32 time samples to a temp vector */
s_vec[i] = float32(C.g_main_data.is[gr][ch][i*18+ss]) s_vec[i] = float32(theMPEG1MainData.is[gr][ch][i*18+ss])
} }
for i := 0; i < 64; i++ { /* Matrix multiply input with n_win[][] matrix */ for i := 0; i < 64; i++ { /* Matrix multiply input with n_win[][] matrix */
sum := float32(0) sum := float32(0)

23
audio/mp3/maindata.go
View File

@ -18,7 +18,6 @@ package mp3
// #include "pdmp3.h" // #include "pdmp3.h"
// //
// extern t_mpeg1_main_data g_main_data;
// extern t_mpeg1_header g_frame_header; // extern t_mpeg1_header g_frame_header;
// extern t_mpeg1_side_info g_side_info; // extern t_mpeg1_side_info g_side_info;
import "C" import "C"
@ -78,7 +77,7 @@ func readMainL3() error {
if (C.g_side_info.win_switch_flag[gr][ch] != 0) && (C.g_side_info.block_type[gr][ch] == 2) { if (C.g_side_info.win_switch_flag[gr][ch] != 0) && (C.g_side_info.block_type[gr][ch] == 2) {
if C.g_side_info.mixed_block_flag[gr][ch] != 0 { if C.g_side_info.mixed_block_flag[gr][ch] != 0 {
for sfb := 0; sfb < 8; sfb++ { for sfb := 0; sfb < 8; sfb++ {
C.g_main_data.scalefac_l[gr][ch][sfb] = C.uint(getMainBits(slen1)) theMPEG1MainData.scalefac_l[gr][ch][sfb] = getMainBits(slen1)
} }
for sfb := 3; sfb < 12; sfb++ { for sfb := 3; sfb < 12; sfb++ {
/*slen1 for band 3-5,slen2 for 6-11*/ /*slen1 for band 3-5,slen2 for 6-11*/
@ -87,7 +86,7 @@ func readMainL3() error {
nbits = slen1 nbits = slen1
} }
for win := 0; win < 3; win++ { for win := 0; win < 3; win++ {
C.g_main_data.scalefac_s[gr][ch][sfb][win] = C.uint(getMainBits(nbits)) theMPEG1MainData.scalefac_s[gr][ch][sfb][win] = getMainBits(nbits)
} }
} }
} else { } else {
@ -98,7 +97,7 @@ func readMainL3() error {
nbits = slen1 nbits = slen1
} }
for win := 0; win < 3; win++ { for win := 0; win < 3; win++ {
C.g_main_data.scalefac_s[gr][ch][sfb][win] = C.uint(getMainBits(nbits)) theMPEG1MainData.scalefac_s[gr][ch][sfb][win] = getMainBits(nbits)
} }
} }
} }
@ -106,45 +105,45 @@ func readMainL3() error {
/* Scale factor bands 0-5 */ /* Scale factor bands 0-5 */
if (C.g_side_info.scfsi[ch][0] == 0) || (gr == 0) { if (C.g_side_info.scfsi[ch][0] == 0) || (gr == 0) {
for sfb := 0; sfb < 6; sfb++ { for sfb := 0; sfb < 6; sfb++ {
C.g_main_data.scalefac_l[gr][ch][sfb] = C.uint(getMainBits(slen1)) theMPEG1MainData.scalefac_l[gr][ch][sfb] = getMainBits(slen1)
} }
} else if (C.g_side_info.scfsi[ch][0] == 1) && (gr == 1) { } else if (C.g_side_info.scfsi[ch][0] == 1) && (gr == 1) {
/* Copy scalefactors from granule 0 to granule 1 */ /* Copy scalefactors from granule 0 to granule 1 */
for sfb := 0; sfb < 6; sfb++ { for sfb := 0; sfb < 6; sfb++ {
C.g_main_data.scalefac_l[1][ch][sfb] = C.g_main_data.scalefac_l[0][ch][sfb] theMPEG1MainData.scalefac_l[1][ch][sfb] = theMPEG1MainData.scalefac_l[0][ch][sfb]
} }
} }
/* Scale factor bands 6-10 */ /* Scale factor bands 6-10 */
if (C.g_side_info.scfsi[ch][1] == 0) || (gr == 0) { if (C.g_side_info.scfsi[ch][1] == 0) || (gr == 0) {
for sfb := 6; sfb < 11; sfb++ { for sfb := 6; sfb < 11; sfb++ {
C.g_main_data.scalefac_l[gr][ch][sfb] = C.uint(getMainBits(slen1)) theMPEG1MainData.scalefac_l[gr][ch][sfb] = getMainBits(slen1)
} }
} else if (C.g_side_info.scfsi[ch][1] == 1) && (gr == 1) { } else if (C.g_side_info.scfsi[ch][1] == 1) && (gr == 1) {
/* Copy scalefactors from granule 0 to granule 1 */ /* Copy scalefactors from granule 0 to granule 1 */
for sfb := 6; sfb < 11; sfb++ { for sfb := 6; sfb < 11; sfb++ {
C.g_main_data.scalefac_l[1][ch][sfb] = C.g_main_data.scalefac_l[0][ch][sfb] theMPEG1MainData.scalefac_l[1][ch][sfb] = theMPEG1MainData.scalefac_l[0][ch][sfb]
} }
} }
/* Scale factor bands 11-15 */ /* Scale factor bands 11-15 */
if (C.g_side_info.scfsi[ch][2] == 0) || (gr == 0) { if (C.g_side_info.scfsi[ch][2] == 0) || (gr == 0) {
for sfb := 11; sfb < 16; sfb++ { for sfb := 11; sfb < 16; sfb++ {
C.g_main_data.scalefac_l[gr][ch][sfb] = C.uint(getMainBits(slen2)) theMPEG1MainData.scalefac_l[gr][ch][sfb] = getMainBits(slen2)
} }
} else if (C.g_side_info.scfsi[ch][2] == 1) && (gr == 1) { } else if (C.g_side_info.scfsi[ch][2] == 1) && (gr == 1) {
/* Copy scalefactors from granule 0 to granule 1 */ /* Copy scalefactors from granule 0 to granule 1 */
for sfb := 11; sfb < 16; sfb++ { for sfb := 11; sfb < 16; sfb++ {
C.g_main_data.scalefac_l[1][ch][sfb] = C.uint(C.g_main_data.scalefac_l[0][ch][sfb]) theMPEG1MainData.scalefac_l[1][ch][sfb] = theMPEG1MainData.scalefac_l[0][ch][sfb]
} }
} }
/* Scale factor bands 16-20 */ /* Scale factor bands 16-20 */
if (C.g_side_info.scfsi[ch][3] == 0) || (gr == 0) { if (C.g_side_info.scfsi[ch][3] == 0) || (gr == 0) {
for sfb := 16; sfb < 21; sfb++ { for sfb := 16; sfb < 21; sfb++ {
C.g_main_data.scalefac_l[gr][ch][sfb] = C.uint(getMainBits(slen2)) theMPEG1MainData.scalefac_l[gr][ch][sfb] = getMainBits(slen2)
} }
} else if (C.g_side_info.scfsi[ch][3] == 1) && (gr == 1) { } else if (C.g_side_info.scfsi[ch][3] == 1) && (gr == 1) {
/* Copy scalefactors from granule 0 to granule 1 */ /* Copy scalefactors from granule 0 to granule 1 */
for sfb := 16; sfb < 21; sfb++ { for sfb := 16; sfb < 21; sfb++ {
C.g_main_data.scalefac_l[1][ch][sfb] = C.g_main_data.scalefac_l[0][ch][sfb] theMPEG1MainData.scalefac_l[1][ch][sfb] = theMPEG1MainData.scalefac_l[0][ch][sfb]
} }
} }
} }

22
audio/mp3/pdmp3.c
View File

@ -59,30 +59,8 @@ g_sampling_frequency[3] = { 44100 * Hz,48000 * Hz,32000 * Hz };
unsigned synth_init = 1; unsigned synth_init = 1;
/* Scale factor band indices
*
* One table per sample rate. Each table contains the frequency indices
* for the 12 short and 21 long scalefactor bands. The short indices
* must be multiplied by 3 to get the actual index.
*/
static const t_sf_band_indices g_sf_band_indices[3 /* Sampling freq. */] = {
{
{0,4,8,12,16,20,24,30,36,44,52,62,74,90,110,134,162,196,238,288,342,418,576},
{0,4,8,12,16,22,30,40,52,66,84,106,136,192}
},
{
{0,4,8,12,16,20,24,30,36,42,50,60,72,88,106,128,156,190,230,276,330,384,576},
{0,4,8,12,16,22,28,38,50,64,80,100,126,192}
},
{
{0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576},
{0,4,8,12,16,22,30,42,58,78,104,138,180,192}
}
};
t_mpeg1_header g_frame_header; t_mpeg1_header g_frame_header;
t_mpeg1_side_info g_side_info; /* < 100 words */ t_mpeg1_side_info g_side_info; /* < 100 words */
t_mpeg1_main_data g_main_data; /* Large static data(~2500 words) */
#ifdef DEBUG #ifdef DEBUG
static void dmp_fr(t_mpeg1_header *hdr){ static void dmp_fr(t_mpeg1_header *hdr){

11
audio/mp3/pdmp3.h
View File

@ -72,16 +72,5 @@ typedef struct { /* MPEG1 Layer 3 Side Information : [2][2] means [gr][ch] */
unsigned count1[2][2]; /* Not in file,calc. by huff.dec.! */ unsigned count1[2][2]; /* Not in file,calc. by huff.dec.! */
} }
t_mpeg1_side_info; t_mpeg1_side_info;
typedef struct { /* MPEG1 Layer 3 Main Data */
unsigned scalefac_l[2][2][21]; /* 0-4 bits */
unsigned scalefac_s[2][2][12][3]; /* 0-4 bits */
float is[2][2][576]; /* Huffman coded freq. lines */
}
t_mpeg1_main_data;
typedef struct { /* Scale factor band indices,for long and short windows */
unsigned l[23];
unsigned s[14];
}
t_sf_band_indices;
#endif #endif

17
audio/mp3/read.go
View File

@ -18,7 +18,6 @@ package mp3
// #include "pdmp3.h" // #include "pdmp3.h"
// //
// extern t_mpeg1_main_data g_main_data;
// extern t_mpeg1_side_info g_side_info; // extern t_mpeg1_side_info g_side_info;
// extern t_mpeg1_header g_frame_header; // extern t_mpeg1_header g_frame_header;
import "C" import "C"
@ -174,7 +173,7 @@ func readHuffman(part_2_start, gr, ch int) error {
/* Check that there is any data to decode. If not,zero the array. */ /* Check that there is any data to decode. If not,zero the array. */
if C.g_side_info.part2_3_length[gr][ch] == 0 { if C.g_side_info.part2_3_length[gr][ch] == 0 {
for is_pos := 0; is_pos < 576; is_pos++ { for is_pos := 0; is_pos < 576; is_pos++ {
C.g_main_data.is[gr][ch][is_pos] = 0.0 theMPEG1MainData.is[gr][ch][is_pos] = 0.0
} }
return nil return nil
} }
@ -210,9 +209,9 @@ func readHuffman(part_2_start, gr, ch int) error {
return err return err
} }
/* In the big_values area there are two freq lines per Huffman word */ /* In the big_values area there are two freq lines per Huffman word */
C.g_main_data.is[gr][ch][is_pos] = C.float(x) theMPEG1MainData.is[gr][ch][is_pos] = float32(x)
is_pos++ is_pos++
C.g_main_data.is[gr][ch][is_pos] = C.float(y) theMPEG1MainData.is[gr][ch][is_pos] = float32(y)
} }
/* Read small values until is_pos = 576 or we run out of huffman data */ /* Read small values until is_pos = 576 or we run out of huffman data */
table_num := int(C.g_side_info.count1table_select[gr][ch]) + 32 table_num := int(C.g_side_info.count1table_select[gr][ch]) + 32
@ -223,22 +222,22 @@ func readHuffman(part_2_start, gr, ch int) error {
if err != nil { if err != nil {
return err return err
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(v) theMPEG1MainData.is[gr][ch][is_pos] = float32(v)
is_pos++ is_pos++
if is_pos >= 576 { if is_pos >= 576 {
break break
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(w) theMPEG1MainData.is[gr][ch][is_pos] = float32(w)
is_pos++ is_pos++
if is_pos >= 576 { if is_pos >= 576 {
break break
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(x) theMPEG1MainData.is[gr][ch][is_pos] = float32(x)
is_pos++ is_pos++
if is_pos >= 576 { if is_pos >= 576 {
break break
} }
C.g_main_data.is[gr][ch][is_pos] = C.float(y) theMPEG1MainData.is[gr][ch][is_pos] = float32(y)
} }
/* Check that we didn't read past the end of this section */ /* Check that we didn't read past the end of this section */
if getMainPos() > (bit_pos_end + 1) { if getMainPos() > (bit_pos_end + 1) {
@ -249,7 +248,7 @@ func readHuffman(part_2_start, gr, ch int) error {
C.g_side_info.count1[gr][ch] = C.unsigned(is_pos) C.g_side_info.count1[gr][ch] = C.unsigned(is_pos)
/* Zero out the last part if necessary */ /* Zero out the last part if necessary */
for ; /* is_pos comes from last for-loop */ is_pos < 576; is_pos++ { for ; /* is_pos comes from last for-loop */ is_pos < 576; is_pos++ {
C.g_main_data.is[gr][ch][is_pos] = 0.0 theMPEG1MainData.is[gr][ch][is_pos] = 0.0
} }
/* Set the bitpos to point to the next part to read */ /* Set the bitpos to point to the next part to read */
setMainPos(bit_pos_end + 1) setMainPos(bit_pos_end + 1)

90
audio/mp3/types.go Normal file
View File

@ -0,0 +1,90 @@
// Copyright 2017 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !js
package mp3
type mpeg1Layer int
const (
mpeg1LayerReserved mpeg1Layer = 0
mpeg1Layer3 mpeg1Layer = 1
mpeg1Layer2 mpeg1Layer = 2
mpeg1Layer1 mpeg1Layer = 3
)
type mpeg1Mode int
const (
mpeg1ModeStereo mpeg1Mode = iota
mpeg1ModeJointStereo
mpeg1ModeDualChannel
mpeg1ModeSingleChannel
)
// A mepg1FrameHeader is MPEG1 Layer 1-3 frame header
type mpeg1FrameHeader struct {
id int // 1 bit
layer mpeg1Layer // 2 bits
protection_bit int // 1 bit
bitrate_index int // 4 bits
sampling_frequency int // 2 bits
padding_bit int // 1 bit
private_bit int // 1 bit
mode mpeg1Mode // 2 bits
mode_extension int // 2 bits
copyright int // 1 bit
original_or_copy int // 1 bit
emphasis int // 2 bits
}
var theMPEG1FrameHeader mpeg1FrameHeader
// A mpeg1SideInfo is MPEG1 Layer 3 Side Information.
// [2][2] means [gr][ch].
type mpeg1SideInfo struct {
main_data_begin int // 9 bits
private_bits int // 3 bits in mono, 5 in stereo
scfsi [2][4]int // 1 bit
part2_3_length [2][2]int // 12 bits
big_values [2][2]int // 9 bits
global_gain [2][2]int // 8 bits
scalefac_compress [2][2]int // 4 bits
win_switch_flag [2][2]int // 1 bit
block_type [2][2]int // 2 bits
mixed_block_flag [2][2]int // 1 bit
table_select [2][2][3]int // 5 bits
subblock_gain [2][2][3]int // 3 bits
region0_count [2][2]int // 4 bits
region1_count [2][2]int // 3 bits
preflag [2][2]int // 1 bit
scalefac_scale [2][2]int // 1 bit
count1table_select [2][2]int // 1 bit
count1 [2][2]int // Not in file,calc. by huff.dec.!
}
var theMPEG1SideInfo mpeg1SideInfo
// A mpeg1MainData is MPEG1 Layer 3 Main Data.
type mpeg1MainData struct {
scalefac_l [2][2][21]int // 0-4 bits
scalefac_s [2][2][12][3]int // 0-4 bits
is [2][2][576]float32 // Huffman coded freq. lines
}
var theMPEG1MainData mpeg1MainData