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audio/mp3: Refactoring
This commit is contained in:
Hajime Hoshi
parent
3f24b7193a
commit
c96b54dbfb
@ -28,19 +28,24 @@ import (
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"unsafe"
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)
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type sfBandIndices struct {
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l []int
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s []int
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}
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var (
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g_sf_band_indices = [3]sfBandIndices{
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sfBandIndicesSet = []sfBandIndices{
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{
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l: [...]int{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576},
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s: [...]int{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192},
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l: []int{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576},
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s: []int{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192},
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},
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{
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l: [...]int{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576},
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s: [...]int{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192},
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l: []int{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576},
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s: []int{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192},
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},
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{
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l: [...]int{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576},
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s: [...]int{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192},
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l: []int{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576},
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s: []int{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192},
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},
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}
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)
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@ -59,8 +64,8 @@ func L3_Reorder(gr C.unsigned, ch C.unsigned) {
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if C.g_side_info.mixed_block_flag[gr][ch] != 0 {
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sfb = 3
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}
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next_sfb := g_sf_band_indices[sfreq].s[sfb+1] * 3
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win_len := g_sf_band_indices[sfreq].s[sfb+1] - g_sf_band_indices[sfreq].s[sfb]
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next_sfb := sfBandIndicesSet[sfreq].s[sfb+1] * 3
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win_len := sfBandIndicesSet[sfreq].s[sfb+1] - sfBandIndicesSet[sfreq].s[sfb]
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i := 36
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if sfb == 0 {
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i = 0
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@ -70,15 +75,15 @@ func L3_Reorder(gr C.unsigned, ch C.unsigned) {
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if i == next_sfb {
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/* Copy reordered data back to the original vector */
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for j := 0; j < 3*win_len; j++ {
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C.g_main_data.is[gr][ch][3*g_sf_band_indices[sfreq].s[sfb]+j] = C.float(re[j])
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C.g_main_data.is[gr][ch][3*sfBandIndicesSet[sfreq].s[sfb]+j] = C.float(re[j])
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}
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/* Check if this band is above the rzero region,if so we're done */
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if C.uint(i) >= C.g_side_info.count1[gr][ch] {
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return
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}
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sfb++
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next_sfb = g_sf_band_indices[sfreq].s[sfb+1] * 3
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win_len = g_sf_band_indices[sfreq].s[sfb+1] - g_sf_band_indices[sfreq].s[sfb]
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next_sfb = sfBandIndicesSet[sfreq].s[sfb+1] * 3
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win_len = sfBandIndicesSet[sfreq].s[sfb+1] - sfBandIndicesSet[sfreq].s[sfb]
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}
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for win := 0; win < 3; win++ { /* Do the actual reordering */
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for j := 0; j < win_len; j++ {
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@ -89,16 +94,11 @@ func L3_Reorder(gr C.unsigned, ch C.unsigned) {
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}
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/* Copy reordered data of last band back to original vector */
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for j := 0; j < 3*win_len; j++ {
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C.g_main_data.is[gr][ch][3*g_sf_band_indices[sfreq].s[12]+j] = C.float(re[j])
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C.g_main_data.is[gr][ch][3*sfBandIndicesSet[sfreq].s[12]+j] = C.float(re[j])
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}
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}
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}
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type sfBandIndices struct {
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l [23]int
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s [14]int
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}
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var (
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is_ratios = [6]float32{0.000000, 0.267949, 0.577350, 1.000000, 1.732051, 3.732051}
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)
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@ -110,8 +110,8 @@ func stereoProcessIntensityLong(gr int, sfb int) {
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is_pos := C.g_main_data.scalefac_l[gr][0][sfb]
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if is_pos != 7 {
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sfreq := C.g_frame_header.sampling_frequency /* Setup sampling freq index */
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sfb_start := g_sf_band_indices[sfreq].l[sfb]
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sfb_stop := g_sf_band_indices[sfreq].l[sfb+1]
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sfb_start := sfBandIndicesSet[sfreq].l[sfb]
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sfb_stop := sfBandIndicesSet[sfreq].l[sfb+1]
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if is_pos == 6 { /* tan((6*PI)/12 = PI/2) needs special treatment! */
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is_ratio_l = 1.0
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is_ratio_r = 0.0
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@ -132,13 +132,13 @@ func stereoProcessIntensityShort(gr int, sfb int) {
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is_ratio_r := float32(0)
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sfreq := C.g_frame_header.sampling_frequency /* Setup sampling freq index */
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/* The window length */
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win_len := g_sf_band_indices[sfreq].s[sfb+1] - g_sf_band_indices[sfreq].s[sfb]
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win_len := sfBandIndicesSet[sfreq].s[sfb+1] - sfBandIndicesSet[sfreq].s[sfb]
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/* The three windows within the band has different scalefactors */
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for win := 0; win < 3; win++ {
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/* Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo */
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is_pos := C.g_main_data.scalefac_s[gr][0][sfb][win]
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if is_pos != 7 {
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sfb_start := g_sf_band_indices[sfreq].s[sfb]*3 + win_len*win
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sfb_start := sfBandIndicesSet[sfreq].s[sfb]*3 + win_len*win
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sfb_stop := sfb_start + win_len
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if is_pos == 6 { /* tan((6*PI)/12 = PI/2) needs special treatment! */
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is_ratio_l = 1.0
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@ -195,21 +195,21 @@ func L3_Stereo(gr C.unsigned) {
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if C.g_side_info.mixed_block_flag[gr][0] != 0 { /* 2 longbl. sb first */
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for sfb := 0; sfb < 8; sfb++ { /* First process 8 sfb's at start */
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/* Is this scale factor band above count1 for the right channel? */
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if C.unsigned(g_sf_band_indices[sfreq].l[sfb]) >= C.g_side_info.count1[gr][1] {
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if C.unsigned(sfBandIndicesSet[sfreq].l[sfb]) >= C.g_side_info.count1[gr][1] {
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stereoProcessIntensityLong(int(gr), int(sfb))
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}
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}
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/* And next the remaining bands which uses short blocks */
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for sfb := 3; sfb < 12; sfb++ {
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/* Is this scale factor band above count1 for the right channel? */
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if C.unsigned(g_sf_band_indices[sfreq].s[sfb])*3 >= C.g_side_info.count1[gr][1] {
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if C.unsigned(sfBandIndicesSet[sfreq].s[sfb])*3 >= C.g_side_info.count1[gr][1] {
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stereoProcessIntensityShort(int(gr), int(sfb)) /* intensity stereo processing */
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}
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}
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} else { /* Only short blocks */
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for sfb := 0; sfb < 12; sfb++ {
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/* Is this scale factor band above count1 for the right channel? */
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if C.unsigned(g_sf_band_indices[sfreq].s[sfb])*3 >= C.g_side_info.count1[gr][1] {
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if C.unsigned(sfBandIndicesSet[sfreq].s[sfb])*3 >= C.g_side_info.count1[gr][1] {
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stereoProcessIntensityShort(int(gr), int(sfb)) /* intensity stereo processing */
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}
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}
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@ -217,7 +217,7 @@ func L3_Stereo(gr C.unsigned) {
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} else { /* Only long blocks */
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for sfb := 0; sfb < 21; sfb++ {
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/* Is this scale factor band above count1 for the right channel? */
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if C.unsigned(g_sf_band_indices[sfreq].l[sfb]) >= C.g_side_info.count1[gr][1] {
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if C.unsigned(sfBandIndicesSet[sfreq].l[sfb]) >= C.g_side_info.count1[gr][1] {
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/* Perform the intensity stereo processing */
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stereoProcessIntensityLong(int(gr), int(sfb))
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}
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