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# go-mp3
A MP3 decoder in pure Go based on [PDMP3](https://github.com/technosaurus/PDMP3).

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"io"
)
func (f *frame) decodeL3() []uint8 {
out := make([]uint8, 576*4*2)
nch := f.header.numberOfChannels()
for gr := 0; gr < 2; gr++ {
for ch := 0; ch < nch; ch++ {
f.l3Requantize(gr, ch)
// Reorder short blocks
f.l3Reorder(gr, ch)
}
f.l3Stereo(gr)
for ch := 0; ch < nch; ch++ {
f.l3Antialias(gr, ch)
// (IMDCT,windowing,overlapp add)
f.l3HybridSynthesis(gr, ch)
f.l3FrequencyInversion(gr, ch)
// Polyphase subband synthesis
f.l3SubbandSynthesis(gr, ch, out[576*4*gr:])
}
}
return out
}
type source struct {
reader io.ReadCloser
readerCache []uint8
readerPos int
readerEOF bool
}
func (s *source) Close() error {
return s.reader.Close()
}
func (s *source) rewind() error {
seeker := s.reader.(io.Seeker)
if _, err := seeker.Seek(0, io.SeekStart); err != nil {
return err
}
s.readerCache = nil
s.readerPos = 0
s.readerEOF = false
return nil
}
func (s *source) getByte() (uint8, error) {
for len(s.readerCache) == 0 && !s.readerEOF {
buf := make([]uint8, 4096)
n, err := s.reader.Read(buf)
s.readerCache = append(s.readerCache, buf[:n]...)
if err != nil {
if err == io.EOF {
s.readerEOF = true
break
}
return 0, err
}
}
if len(s.readerCache) == 0 {
return 0, io.EOF
}
b := s.readerCache[0]
s.readerCache = s.readerCache[1:]
s.readerPos++
return b, nil
}
func (s *source) getBytes(buf []int) (int, error) {
for i := range buf {
v, err := s.getByte()
buf[i] = int(v)
if err == io.EOF {
return i, io.EOF
}
}
return len(buf), nil
}
func (s *source) getFilepos() int {
return s.readerPos
}
type Decoded struct {
source *source
sampleRate int
length int64
buf []uint8
frame *frame
eof bool
}
func (d *Decoded) read() error {
var err error
d.frame, err = d.source.readNextFrame(d.frame)
if err != nil {
if err == io.EOF {
d.eof = true
}
return err
}
d.buf = append(d.buf, d.frame.decodeL3()...)
return nil
}
// Read is io.Reader's Read.
func (d *Decoded) Read(buf []uint8) (int, error) {
for len(d.buf) == 0 && !d.eof {
if err := d.read(); err != nil {
return 0, err
}
}
if d.eof {
return 0, io.EOF
}
n := copy(buf, d.buf)
d.buf = d.buf[n:]
return n, nil
}
// Close is io.Closer's Close.
func (d *Decoded) Close() error {
return d.source.Close()
}
// SampleRate returns the sample rate like 44100.
//
// Note that the sample rate is retrieved from the first frame.
func (d *Decoded) SampleRate() int {
return d.sampleRate
}
// Length returns the total size in bytes.
//
// Length returns -1 when the total size is not available
// e.g. when the given source is not io.Seeker.
func (d *Decoded) Length() int64 {
return d.length
}
// Decode decodes the given io.ReadCLoser and returns a decoded stream.
//
// The stream is always formatted as 16bit (little endian) 2 channels
// even if the source is single channel MP3.
// Thus, a sample always consists of 4 bytes.
//
// If r is io.Seeker, a decoded stream checks its length and Length returns a valid value.
func Decode(r io.ReadCloser) (*Decoded, error) {
s := &source{
reader: r,
}
d := &Decoded{
source: s,
length: -1,
}
if _, ok := r.(io.Seeker); ok {
l := int64(0)
var f *frame
for {
var err error
f, err = s.readNextFrame(f)
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
l += 576 * 4 * 2
}
if err := s.rewind(); err != nil {
return nil, err
}
d.length = l
}
if err := d.read(); err != nil {
return nil, err
}
d.sampleRate = samplingFrequency[d.frame.header.sampling_frequency]
return d, nil
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"fmt"
)
var huffmanTable = []uint16{
// 1
0x0201, 0x0000, 0x0201, 0x0010, 0x0201, 0x0001, 0x0011,
// 2
0x0201, 0x0000, 0x0401, 0x0201, 0x0010, 0x0001, 0x0201, 0x0011, 0x0401, 0x0201, 0x0020,
0x0021, 0x0201, 0x0012, 0x0201, 0x0002, 0x0022,
// 3
0x0401, 0x0201, 0x0000, 0x0001, 0x0201, 0x0011, 0x0201, 0x0010, 0x0401, 0x0201, 0x0020,
0x0021, 0x0201, 0x0012, 0x0201, 0x0002, 0x0022,
// 5
0x0201, 0x0000, 0x0401, 0x0201, 0x0010, 0x0001, 0x0201, 0x0011, 0x0801, 0x0401, 0x0201,
0x0020, 0x0002, 0x0201, 0x0021, 0x0012, 0x0801, 0x0401, 0x0201, 0x0022, 0x0030, 0x0201,
0x0003, 0x0013, 0x0201, 0x0031, 0x0201, 0x0032, 0x0201, 0x0023, 0x0033,
// 6
0x0601, 0x0401, 0x0201, 0x0000, 0x0010, 0x0011, 0x0601, 0x0201, 0x0001, 0x0201, 0x0020,
0x0021, 0x0601, 0x0201, 0x0012, 0x0201, 0x0002, 0x0022, 0x0401, 0x0201, 0x0031, 0x0013,
0x0401, 0x0201, 0x0030, 0x0032, 0x0201, 0x0023, 0x0201, 0x0003, 0x0033,
// 7
0x0201, 0x0000, 0x0401, 0x0201, 0x0010, 0x0001, 0x0801, 0x0201, 0x0011, 0x0401, 0x0201,
0x0020, 0x0002, 0x0021, 0x1201, 0x0601, 0x0201, 0x0012, 0x0201, 0x0022, 0x0030, 0x0401,
0x0201, 0x0031, 0x0013, 0x0401, 0x0201, 0x0003, 0x0032, 0x0201, 0x0023, 0x0004, 0x0a01,
0x0401, 0x0201, 0x0040, 0x0041, 0x0201, 0x0014, 0x0201, 0x0042, 0x0024, 0x0c01, 0x0601,
0x0401, 0x0201, 0x0033, 0x0043, 0x0050, 0x0401, 0x0201, 0x0034, 0x0005, 0x0051, 0x0601,
0x0201, 0x0015, 0x0201, 0x0052, 0x0025, 0x0401, 0x0201, 0x0044, 0x0035, 0x0401, 0x0201,
0x0053, 0x0054, 0x0201, 0x0045, 0x0055,
// 8
0x0601, 0x0201, 0x0000, 0x0201, 0x0010, 0x0001, 0x0201, 0x0011, 0x0401, 0x0201, 0x0021,
0x0012, 0x0e01, 0x0401, 0x0201, 0x0020, 0x0002, 0x0201, 0x0022, 0x0401, 0x0201, 0x0030,
0x0003, 0x0201, 0x0031, 0x0013, 0x0e01, 0x0801, 0x0401, 0x0201, 0x0032, 0x0023, 0x0201,
0x0040, 0x0004, 0x0201, 0x0041, 0x0201, 0x0014, 0x0042, 0x0c01, 0x0601, 0x0201, 0x0024,
0x0201, 0x0033, 0x0050, 0x0401, 0x0201, 0x0043, 0x0034, 0x0051, 0x0601, 0x0201, 0x0015,
0x0201, 0x0005, 0x0052, 0x0601, 0x0201, 0x0025, 0x0201, 0x0044, 0x0035, 0x0201, 0x0053,
0x0201, 0x0045, 0x0201, 0x0054, 0x0055,
// 9
0x0801, 0x0401, 0x0201, 0x0000, 0x0010, 0x0201, 0x0001, 0x0011, 0x0a01, 0x0401, 0x0201,
0x0020, 0x0021, 0x0201, 0x0012, 0x0201, 0x0002, 0x0022, 0x0c01, 0x0601, 0x0401, 0x0201,
0x0030, 0x0003, 0x0031, 0x0201, 0x0013, 0x0201, 0x0032, 0x0023, 0x0c01, 0x0401, 0x0201,
0x0041, 0x0014, 0x0401, 0x0201, 0x0040, 0x0033, 0x0201, 0x0042, 0x0024, 0x0a01, 0x0601,
0x0401, 0x0201, 0x0004, 0x0050, 0x0043, 0x0201, 0x0034, 0x0051, 0x0801, 0x0401, 0x0201,
0x0015, 0x0052, 0x0201, 0x0025, 0x0044, 0x0601, 0x0401, 0x0201, 0x0005, 0x0054, 0x0053,
0x0201, 0x0035, 0x0201, 0x0045, 0x0055,
// 10
0x0201, 0x0000, 0x0401, 0x0201, 0x0010, 0x0001, 0x0a01, 0x0201, 0x0011, 0x0401, 0x0201,
0x0020, 0x0002, 0x0201, 0x0021, 0x0012, 0x1c01, 0x0801, 0x0401, 0x0201, 0x0022, 0x0030,
0x0201, 0x0031, 0x0013, 0x0801, 0x0401, 0x0201, 0x0003, 0x0032, 0x0201, 0x0023, 0x0040,
0x0401, 0x0201, 0x0041, 0x0014, 0x0401, 0x0201, 0x0004, 0x0033, 0x0201, 0x0042, 0x0024,
0x1c01, 0x0a01, 0x0601, 0x0401, 0x0201, 0x0050, 0x0005, 0x0060, 0x0201, 0x0061, 0x0016,
0x0c01, 0x0601, 0x0401, 0x0201, 0x0043, 0x0034, 0x0051, 0x0201, 0x0015, 0x0201, 0x0052,
0x0025, 0x0401, 0x0201, 0x0026, 0x0036, 0x0071, 0x1401, 0x0801, 0x0201, 0x0017, 0x0401,
0x0201, 0x0044, 0x0053, 0x0006, 0x0601, 0x0401, 0x0201, 0x0035, 0x0045, 0x0062, 0x0201,
0x0070, 0x0201, 0x0007, 0x0064, 0x0e01, 0x0401, 0x0201, 0x0072, 0x0027, 0x0601, 0x0201,
0x0063, 0x0201, 0x0054, 0x0055, 0x0201, 0x0046, 0x0073, 0x0801, 0x0401, 0x0201, 0x0037,
0x0065, 0x0201, 0x0056, 0x0074, 0x0601, 0x0201, 0x0047, 0x0201, 0x0066, 0x0075, 0x0401,
0x0201, 0x0057, 0x0076, 0x0201, 0x0067, 0x0077,
// 11
0x0601, 0x0201, 0x0000, 0x0201, 0x0010, 0x0001, 0x0801, 0x0201, 0x0011, 0x0401, 0x0201,
0x0020, 0x0002, 0x0012, 0x1801, 0x0801, 0x0201, 0x0021, 0x0201, 0x0022, 0x0201, 0x0030,
0x0003, 0x0401, 0x0201, 0x0031, 0x0013, 0x0401, 0x0201, 0x0032, 0x0023, 0x0401, 0x0201,
0x0040, 0x0004, 0x0201, 0x0041, 0x0014, 0x1e01, 0x1001, 0x0a01, 0x0401, 0x0201, 0x0042,
0x0024, 0x0401, 0x0201, 0x0033, 0x0043, 0x0050, 0x0401, 0x0201, 0x0034, 0x0051, 0x0061,
0x0601, 0x0201, 0x0016, 0x0201, 0x0006, 0x0026, 0x0201, 0x0062, 0x0201, 0x0015, 0x0201,
0x0005, 0x0052, 0x1001, 0x0a01, 0x0601, 0x0401, 0x0201, 0x0025, 0x0044, 0x0060, 0x0201,
0x0063, 0x0036, 0x0401, 0x0201, 0x0070, 0x0017, 0x0071, 0x1001, 0x0601, 0x0401, 0x0201,
0x0007, 0x0064, 0x0072, 0x0201, 0x0027, 0x0401, 0x0201, 0x0053, 0x0035, 0x0201, 0x0054,
0x0045, 0x0a01, 0x0401, 0x0201, 0x0046, 0x0073, 0x0201, 0x0037, 0x0201, 0x0065, 0x0056,
0x0a01, 0x0601, 0x0401, 0x0201, 0x0055, 0x0057, 0x0074, 0x0201, 0x0047, 0x0066, 0x0401,
0x0201, 0x0075, 0x0076, 0x0201, 0x0067, 0x0077,
// 12
0x0c01, 0x0401, 0x0201, 0x0010, 0x0001, 0x0201, 0x0011, 0x0201, 0x0000, 0x0201, 0x0020,
0x0002, 0x1001, 0x0401, 0x0201, 0x0021, 0x0012, 0x0401, 0x0201, 0x0022, 0x0031, 0x0201,
0x0013, 0x0201, 0x0030, 0x0201, 0x0003, 0x0040, 0x1a01, 0x0801, 0x0401, 0x0201, 0x0032,
0x0023, 0x0201, 0x0041, 0x0033, 0x0a01, 0x0401, 0x0201, 0x0014, 0x0042, 0x0201, 0x0024,
0x0201, 0x0004, 0x0050, 0x0401, 0x0201, 0x0043, 0x0034, 0x0201, 0x0051, 0x0015, 0x1c01,
0x0e01, 0x0801, 0x0401, 0x0201, 0x0052, 0x0025, 0x0201, 0x0053, 0x0035, 0x0401, 0x0201,
0x0060, 0x0016, 0x0061, 0x0401, 0x0201, 0x0062, 0x0026, 0x0601, 0x0401, 0x0201, 0x0005,
0x0006, 0x0044, 0x0201, 0x0054, 0x0045, 0x1201, 0x0a01, 0x0401, 0x0201, 0x0063, 0x0036,
0x0401, 0x0201, 0x0070, 0x0007, 0x0071, 0x0401, 0x0201, 0x0017, 0x0064, 0x0201, 0x0046,
0x0072, 0x0a01, 0x0601, 0x0201, 0x0027, 0x0201, 0x0055, 0x0073, 0x0201, 0x0037, 0x0056,
0x0801, 0x0401, 0x0201, 0x0065, 0x0074, 0x0201, 0x0047, 0x0066, 0x0401, 0x0201, 0x0075,
0x0057, 0x0201, 0x0076, 0x0201, 0x0067, 0x0077,
// 13
0x0201, 0x0000, 0x0601, 0x0201, 0x0010, 0x0201, 0x0001, 0x0011, 0x1c01, 0x0801, 0x0401,
0x0201, 0x0020, 0x0002, 0x0201, 0x0021, 0x0012, 0x0801, 0x0401, 0x0201, 0x0022, 0x0030,
0x0201, 0x0003, 0x0031, 0x0601, 0x0201, 0x0013, 0x0201, 0x0032, 0x0023, 0x0401, 0x0201,
0x0040, 0x0004, 0x0041, 0x4601, 0x1c01, 0x0e01, 0x0601, 0x0201, 0x0014, 0x0201, 0x0033,
0x0042, 0x0401, 0x0201, 0x0024, 0x0050, 0x0201, 0x0043, 0x0034, 0x0401, 0x0201, 0x0051,
0x0015, 0x0401, 0x0201, 0x0005, 0x0052, 0x0201, 0x0025, 0x0201, 0x0044, 0x0053, 0x0e01,
0x0801, 0x0401, 0x0201, 0x0060, 0x0006, 0x0201, 0x0061, 0x0016, 0x0401, 0x0201, 0x0080,
0x0008, 0x0081, 0x1001, 0x0801, 0x0401, 0x0201, 0x0035, 0x0062, 0x0201, 0x0026, 0x0054,
0x0401, 0x0201, 0x0045, 0x0063, 0x0201, 0x0036, 0x0070, 0x0601, 0x0401, 0x0201, 0x0007,
0x0055, 0x0071, 0x0201, 0x0017, 0x0201, 0x0027, 0x0037, 0x4801, 0x1801, 0x0c01, 0x0401,
0x0201, 0x0018, 0x0082, 0x0201, 0x0028, 0x0401, 0x0201, 0x0064, 0x0046, 0x0072, 0x0801,
0x0401, 0x0201, 0x0084, 0x0048, 0x0201, 0x0090, 0x0009, 0x0201, 0x0091, 0x0019, 0x1801,
0x0e01, 0x0801, 0x0401, 0x0201, 0x0073, 0x0065, 0x0201, 0x0056, 0x0074, 0x0401, 0x0201,
0x0047, 0x0066, 0x0083, 0x0601, 0x0201, 0x0038, 0x0201, 0x0075, 0x0057, 0x0201, 0x0092,
0x0029, 0x0e01, 0x0801, 0x0401, 0x0201, 0x0067, 0x0085, 0x0201, 0x0058, 0x0039, 0x0201,
0x0093, 0x0201, 0x0049, 0x0086, 0x0601, 0x0201, 0x00a0, 0x0201, 0x0068, 0x000a, 0x0201,
0x00a1, 0x001a, 0x4401, 0x1801, 0x0c01, 0x0401, 0x0201, 0x00a2, 0x002a, 0x0401, 0x0201,
0x0095, 0x0059, 0x0201, 0x00a3, 0x003a, 0x0801, 0x0401, 0x0201, 0x004a, 0x0096, 0x0201,
0x00b0, 0x000b, 0x0201, 0x00b1, 0x001b, 0x1401, 0x0801, 0x0201, 0x00b2, 0x0401, 0x0201,
0x0076, 0x0077, 0x0094, 0x0601, 0x0401, 0x0201, 0x0087, 0x0078, 0x00a4, 0x0401, 0x0201,
0x0069, 0x00a5, 0x002b, 0x0c01, 0x0601, 0x0401, 0x0201, 0x005a, 0x0088, 0x00b3, 0x0201,
0x003b, 0x0201, 0x0079, 0x00a6, 0x0601, 0x0401, 0x0201, 0x006a, 0x00b4, 0x00c0, 0x0401,
0x0201, 0x000c, 0x0098, 0x00c1, 0x3c01, 0x1601, 0x0a01, 0x0601, 0x0201, 0x001c, 0x0201,
0x0089, 0x00b5, 0x0201, 0x005b, 0x00c2, 0x0401, 0x0201, 0x002c, 0x003c, 0x0401, 0x0201,
0x00b6, 0x006b, 0x0201, 0x00c4, 0x004c, 0x1001, 0x0801, 0x0401, 0x0201, 0x00a8, 0x008a,
0x0201, 0x00d0, 0x000d, 0x0201, 0x00d1, 0x0201, 0x004b, 0x0201, 0x0097, 0x00a7, 0x0c01,
0x0601, 0x0201, 0x00c3, 0x0201, 0x007a, 0x0099, 0x0401, 0x0201, 0x00c5, 0x005c, 0x00b7,
0x0401, 0x0201, 0x001d, 0x00d2, 0x0201, 0x002d, 0x0201, 0x007b, 0x00d3, 0x3401, 0x1c01,
0x0c01, 0x0401, 0x0201, 0x003d, 0x00c6, 0x0401, 0x0201, 0x006c, 0x00a9, 0x0201, 0x009a,
0x00d4, 0x0801, 0x0401, 0x0201, 0x00b8, 0x008b, 0x0201, 0x004d, 0x00c7, 0x0401, 0x0201,
0x007c, 0x00d5, 0x0201, 0x005d, 0x00e0, 0x0a01, 0x0401, 0x0201, 0x00e1, 0x001e, 0x0401,
0x0201, 0x000e, 0x002e, 0x00e2, 0x0801, 0x0401, 0x0201, 0x00e3, 0x006d, 0x0201, 0x008c,
0x00e4, 0x0401, 0x0201, 0x00e5, 0x00ba, 0x00f0, 0x2601, 0x1001, 0x0401, 0x0201, 0x00f1,
0x001f, 0x0601, 0x0401, 0x0201, 0x00aa, 0x009b, 0x00b9, 0x0201, 0x003e, 0x0201, 0x00d6,
0x00c8, 0x0c01, 0x0601, 0x0201, 0x004e, 0x0201, 0x00d7, 0x007d, 0x0201, 0x00ab, 0x0201,
0x005e, 0x00c9, 0x0601, 0x0201, 0x000f, 0x0201, 0x009c, 0x006e, 0x0201, 0x00f2, 0x002f,
0x2001, 0x1001, 0x0601, 0x0401, 0x0201, 0x00d8, 0x008d, 0x003f, 0x0601, 0x0201, 0x00f3,
0x0201, 0x00e6, 0x00ca, 0x0201, 0x00f4, 0x004f, 0x0801, 0x0401, 0x0201, 0x00bb, 0x00ac,
0x0201, 0x00e7, 0x00f5, 0x0401, 0x0201, 0x00d9, 0x009d, 0x0201, 0x005f, 0x00e8, 0x1e01,
0x0c01, 0x0601, 0x0201, 0x006f, 0x0201, 0x00f6, 0x00cb, 0x0401, 0x0201, 0x00bc, 0x00ad,
0x00da, 0x0801, 0x0201, 0x00f7, 0x0401, 0x0201, 0x007e, 0x007f, 0x008e, 0x0601, 0x0401,
0x0201, 0x009e, 0x00ae, 0x00cc, 0x0201, 0x00f8, 0x008f, 0x1201, 0x0801, 0x0401, 0x0201,
0x00db, 0x00bd, 0x0201, 0x00ea, 0x00f9, 0x0401, 0x0201, 0x009f, 0x00eb, 0x0201, 0x00be,
0x0201, 0x00cd, 0x00fa, 0x0e01, 0x0401, 0x0201, 0x00dd, 0x00ec, 0x0601, 0x0401, 0x0201,
0x00e9, 0x00af, 0x00dc, 0x0201, 0x00ce, 0x00fb, 0x0801, 0x0401, 0x0201, 0x00bf, 0x00de,
0x0201, 0x00cf, 0x00ee, 0x0401, 0x0201, 0x00df, 0x00ef, 0x0201, 0x00ff, 0x0201, 0x00ed,
0x0201, 0x00fd, 0x0201, 0x00fc, 0x00fe,
// 15
0x1001, 0x0601, 0x0201, 0x0000, 0x0201, 0x0010, 0x0001, 0x0201, 0x0011, 0x0401, 0x0201,
0x0020, 0x0002, 0x0201, 0x0021, 0x0012, 0x3201, 0x1001, 0x0601, 0x0201, 0x0022, 0x0201,
0x0030, 0x0031, 0x0601, 0x0201, 0x0013, 0x0201, 0x0003, 0x0040, 0x0201, 0x0032, 0x0023,
0x0e01, 0x0601, 0x0401, 0x0201, 0x0004, 0x0014, 0x0041, 0x0401, 0x0201, 0x0033, 0x0042,
0x0201, 0x0024, 0x0043, 0x0a01, 0x0601, 0x0201, 0x0034, 0x0201, 0x0050, 0x0005, 0x0201,
0x0051, 0x0015, 0x0401, 0x0201, 0x0052, 0x0025, 0x0401, 0x0201, 0x0044, 0x0053, 0x0061,
0x5a01, 0x2401, 0x1201, 0x0a01, 0x0601, 0x0201, 0x0035, 0x0201, 0x0060, 0x0006, 0x0201,
0x0016, 0x0062, 0x0401, 0x0201, 0x0026, 0x0054, 0x0201, 0x0045, 0x0063, 0x0a01, 0x0601,
0x0201, 0x0036, 0x0201, 0x0070, 0x0007, 0x0201, 0x0071, 0x0055, 0x0401, 0x0201, 0x0017,
0x0064, 0x0201, 0x0072, 0x0027, 0x1801, 0x1001, 0x0801, 0x0401, 0x0201, 0x0046, 0x0073,
0x0201, 0x0037, 0x0065, 0x0401, 0x0201, 0x0056, 0x0080, 0x0201, 0x0008, 0x0074, 0x0401,
0x0201, 0x0081, 0x0018, 0x0201, 0x0082, 0x0028, 0x1001, 0x0801, 0x0401, 0x0201, 0x0047,
0x0066, 0x0201, 0x0083, 0x0038, 0x0401, 0x0201, 0x0075, 0x0057, 0x0201, 0x0084, 0x0048,
0x0601, 0x0401, 0x0201, 0x0090, 0x0019, 0x0091, 0x0401, 0x0201, 0x0092, 0x0076, 0x0201,
0x0067, 0x0029, 0x5c01, 0x2401, 0x1201, 0x0a01, 0x0401, 0x0201, 0x0085, 0x0058, 0x0401,
0x0201, 0x0009, 0x0077, 0x0093, 0x0401, 0x0201, 0x0039, 0x0094, 0x0201, 0x0049, 0x0086,
0x0a01, 0x0601, 0x0201, 0x0068, 0x0201, 0x00a0, 0x000a, 0x0201, 0x00a1, 0x001a, 0x0401,
0x0201, 0x00a2, 0x002a, 0x0201, 0x0095, 0x0059, 0x1a01, 0x0e01, 0x0601, 0x0201, 0x00a3,
0x0201, 0x003a, 0x0087, 0x0401, 0x0201, 0x0078, 0x00a4, 0x0201, 0x004a, 0x0096, 0x0601,
0x0401, 0x0201, 0x0069, 0x00b0, 0x00b1, 0x0401, 0x0201, 0x001b, 0x00a5, 0x00b2, 0x0e01,
0x0801, 0x0401, 0x0201, 0x005a, 0x002b, 0x0201, 0x0088, 0x0097, 0x0201, 0x00b3, 0x0201,
0x0079, 0x003b, 0x0801, 0x0401, 0x0201, 0x006a, 0x00b4, 0x0201, 0x004b, 0x00c1, 0x0401,
0x0201, 0x0098, 0x0089, 0x0201, 0x001c, 0x00b5, 0x5001, 0x2201, 0x1001, 0x0601, 0x0401,
0x0201, 0x005b, 0x002c, 0x00c2, 0x0601, 0x0401, 0x0201, 0x000b, 0x00c0, 0x00a6, 0x0201,
0x00a7, 0x007a, 0x0a01, 0x0401, 0x0201, 0x00c3, 0x003c, 0x0401, 0x0201, 0x000c, 0x0099,
0x00b6, 0x0401, 0x0201, 0x006b, 0x00c4, 0x0201, 0x004c, 0x00a8, 0x1401, 0x0a01, 0x0401,
0x0201, 0x008a, 0x00c5, 0x0401, 0x0201, 0x00d0, 0x005c, 0x00d1, 0x0401, 0x0201, 0x00b7,
0x007b, 0x0201, 0x001d, 0x0201, 0x000d, 0x002d, 0x0c01, 0x0401, 0x0201, 0x00d2, 0x00d3,
0x0401, 0x0201, 0x003d, 0x00c6, 0x0201, 0x006c, 0x00a9, 0x0601, 0x0401, 0x0201, 0x009a,
0x00b8, 0x00d4, 0x0401, 0x0201, 0x008b, 0x004d, 0x0201, 0x00c7, 0x007c, 0x4401, 0x2201,
0x1201, 0x0a01, 0x0401, 0x0201, 0x00d5, 0x005d, 0x0401, 0x0201, 0x00e0, 0x000e, 0x00e1,
0x0401, 0x0201, 0x001e, 0x00e2, 0x0201, 0x00aa, 0x002e, 0x0801, 0x0401, 0x0201, 0x00b9,
0x009b, 0x0201, 0x00e3, 0x00d6, 0x0401, 0x0201, 0x006d, 0x003e, 0x0201, 0x00c8, 0x008c,
0x1001, 0x0801, 0x0401, 0x0201, 0x00e4, 0x004e, 0x0201, 0x00d7, 0x007d, 0x0401, 0x0201,
0x00e5, 0x00ba, 0x0201, 0x00ab, 0x005e, 0x0801, 0x0401, 0x0201, 0x00c9, 0x009c, 0x0201,
0x00f1, 0x001f, 0x0601, 0x0401, 0x0201, 0x00f0, 0x006e, 0x00f2, 0x0201, 0x002f, 0x00e6,
0x2601, 0x1201, 0x0801, 0x0401, 0x0201, 0x00d8, 0x00f3, 0x0201, 0x003f, 0x00f4, 0x0601,
0x0201, 0x004f, 0x0201, 0x008d, 0x00d9, 0x0201, 0x00bb, 0x00ca, 0x0801, 0x0401, 0x0201,
0x00ac, 0x00e7, 0x0201, 0x007e, 0x00f5, 0x0801, 0x0401, 0x0201, 0x009d, 0x005f, 0x0201,
0x00e8, 0x008e, 0x0201, 0x00f6, 0x00cb, 0x2201, 0x1201, 0x0a01, 0x0601, 0x0401, 0x0201,
0x000f, 0x00ae, 0x006f, 0x0201, 0x00bc, 0x00da, 0x0401, 0x0201, 0x00ad, 0x00f7, 0x0201,
0x007f, 0x00e9, 0x0801, 0x0401, 0x0201, 0x009e, 0x00cc, 0x0201, 0x00f8, 0x008f, 0x0401,
0x0201, 0x00db, 0x00bd, 0x0201, 0x00ea, 0x00f9, 0x1001, 0x0801, 0x0401, 0x0201, 0x009f,
0x00dc, 0x0201, 0x00cd, 0x00eb, 0x0401, 0x0201, 0x00be, 0x00fa, 0x0201, 0x00af, 0x00dd,
0x0e01, 0x0601, 0x0401, 0x0201, 0x00ec, 0x00ce, 0x00fb, 0x0401, 0x0201, 0x00bf, 0x00ed,
0x0201, 0x00de, 0x00fc, 0x0601, 0x0401, 0x0201, 0x00cf, 0x00fd, 0x00ee, 0x0401, 0x0201,
0x00df, 0x00fe, 0x0201, 0x00ef, 0x00ff,
// 16
0x0201, 0x0000, 0x0601, 0x0201, 0x0010, 0x0201, 0x0001, 0x0011, 0x2a01, 0x0801, 0x0401,
0x0201, 0x0020, 0x0002, 0x0201, 0x0021, 0x0012, 0x0a01, 0x0601, 0x0201, 0x0022, 0x0201,
0x0030, 0x0003, 0x0201, 0x0031, 0x0013, 0x0a01, 0x0401, 0x0201, 0x0032, 0x0023, 0x0401,
0x0201, 0x0040, 0x0004, 0x0041, 0x0601, 0x0201, 0x0014, 0x0201, 0x0033, 0x0042, 0x0401,
0x0201, 0x0024, 0x0050, 0x0201, 0x0043, 0x0034, 0x8a01, 0x2801, 0x1001, 0x0601, 0x0401,
0x0201, 0x0005, 0x0015, 0x0051, 0x0401, 0x0201, 0x0052, 0x0025, 0x0401, 0x0201, 0x0044,
0x0035, 0x0053, 0x0a01, 0x0601, 0x0401, 0x0201, 0x0060, 0x0006, 0x0061, 0x0201, 0x0016,
0x0062, 0x0801, 0x0401, 0x0201, 0x0026, 0x0054, 0x0201, 0x0045, 0x0063, 0x0401, 0x0201,
0x0036, 0x0070, 0x0071, 0x2801, 0x1201, 0x0801, 0x0201, 0x0017, 0x0201, 0x0007, 0x0201,
0x0055, 0x0064, 0x0401, 0x0201, 0x0072, 0x0027, 0x0401, 0x0201, 0x0046, 0x0065, 0x0073,
0x0a01, 0x0601, 0x0201, 0x0037, 0x0201, 0x0056, 0x0008, 0x0201, 0x0080, 0x0081, 0x0601,
0x0201, 0x0018, 0x0201, 0x0074, 0x0047, 0x0201, 0x0082, 0x0201, 0x0028, 0x0066, 0x1801,
0x0e01, 0x0801, 0x0401, 0x0201, 0x0083, 0x0038, 0x0201, 0x0075, 0x0084, 0x0401, 0x0201,
0x0048, 0x0090, 0x0091, 0x0601, 0x0201, 0x0019, 0x0201, 0x0009, 0x0076, 0x0201, 0x0092,
0x0029, 0x0e01, 0x0801, 0x0401, 0x0201, 0x0085, 0x0058, 0x0201, 0x0093, 0x0039, 0x0401,
0x0201, 0x00a0, 0x000a, 0x001a, 0x0801, 0x0201, 0x00a2, 0x0201, 0x0067, 0x0201, 0x0057,
0x0049, 0x0601, 0x0201, 0x0094, 0x0201, 0x0077, 0x0086, 0x0201, 0x00a1, 0x0201, 0x0068,
0x0095, 0xdc01, 0x7e01, 0x3201, 0x1a01, 0x0c01, 0x0601, 0x0201, 0x002a, 0x0201, 0x0059,
0x003a, 0x0201, 0x00a3, 0x0201, 0x0087, 0x0078, 0x0801, 0x0401, 0x0201, 0x00a4, 0x004a,
0x0201, 0x0096, 0x0069, 0x0401, 0x0201, 0x00b0, 0x000b, 0x00b1, 0x0a01, 0x0401, 0x0201,
0x001b, 0x00b2, 0x0201, 0x002b, 0x0201, 0x00a5, 0x005a, 0x0601, 0x0201, 0x00b3, 0x0201,
0x00a6, 0x006a, 0x0401, 0x0201, 0x00b4, 0x004b, 0x0201, 0x000c, 0x00c1, 0x1e01, 0x0e01,
0x0601, 0x0401, 0x0201, 0x00b5, 0x00c2, 0x002c, 0x0401, 0x0201, 0x00a7, 0x00c3, 0x0201,
0x006b, 0x00c4, 0x0801, 0x0201, 0x001d, 0x0401, 0x0201, 0x0088, 0x0097, 0x003b, 0x0401,
0x0201, 0x00d1, 0x00d2, 0x0201, 0x002d, 0x00d3, 0x1201, 0x0601, 0x0401, 0x0201, 0x001e,
0x002e, 0x00e2, 0x0601, 0x0401, 0x0201, 0x0079, 0x0098, 0x00c0, 0x0201, 0x001c, 0x0201,
0x0089, 0x005b, 0x0e01, 0x0601, 0x0201, 0x003c, 0x0201, 0x007a, 0x00b6, 0x0401, 0x0201,
0x004c, 0x0099, 0x0201, 0x00a8, 0x008a, 0x0601, 0x0201, 0x000d, 0x0201, 0x00c5, 0x005c,
0x0401, 0x0201, 0x003d, 0x00c6, 0x0201, 0x006c, 0x009a, 0x5801, 0x5601, 0x2401, 0x1001,
0x0801, 0x0401, 0x0201, 0x008b, 0x004d, 0x0201, 0x00c7, 0x007c, 0x0401, 0x0201, 0x00d5,
0x005d, 0x0201, 0x00e0, 0x000e, 0x0801, 0x0201, 0x00e3, 0x0401, 0x0201, 0x00d0, 0x00b7,
0x007b, 0x0601, 0x0401, 0x0201, 0x00a9, 0x00b8, 0x00d4, 0x0201, 0x00e1, 0x0201, 0x00aa,
0x00b9, 0x1801, 0x0a01, 0x0601, 0x0401, 0x0201, 0x009b, 0x00d6, 0x006d, 0x0201, 0x003e,
0x00c8, 0x0601, 0x0401, 0x0201, 0x008c, 0x00e4, 0x004e, 0x0401, 0x0201, 0x00d7, 0x00e5,
0x0201, 0x00ba, 0x00ab, 0x0c01, 0x0401, 0x0201, 0x009c, 0x00e6, 0x0401, 0x0201, 0x006e,
0x00d8, 0x0201, 0x008d, 0x00bb, 0x0801, 0x0401, 0x0201, 0x00e7, 0x009d, 0x0201, 0x00e8,
0x008e, 0x0401, 0x0201, 0x00cb, 0x00bc, 0x009e, 0x00f1, 0x0201, 0x001f, 0x0201, 0x000f,
0x002f, 0x4201, 0x3801, 0x0201, 0x00f2, 0x3401, 0x3201, 0x1401, 0x0801, 0x0201, 0x00bd,
0x0201, 0x005e, 0x0201, 0x007d, 0x00c9, 0x0601, 0x0201, 0x00ca, 0x0201, 0x00ac, 0x007e,
0x0401, 0x0201, 0x00da, 0x00ad, 0x00cc, 0x0a01, 0x0601, 0x0201, 0x00ae, 0x0201, 0x00db,
0x00dc, 0x0201, 0x00cd, 0x00be, 0x0601, 0x0401, 0x0201, 0x00eb, 0x00ed, 0x00ee, 0x0601,
0x0401, 0x0201, 0x00d9, 0x00ea, 0x00e9, 0x0201, 0x00de, 0x0401, 0x0201, 0x00dd, 0x00ec,
0x00ce, 0x003f, 0x00f0, 0x0401, 0x0201, 0x00f3, 0x00f4, 0x0201, 0x004f, 0x0201, 0x00f5,
0x005f, 0x0a01, 0x0201, 0x00ff, 0x0401, 0x0201, 0x00f6, 0x006f, 0x0201, 0x00f7, 0x007f,
0x0c01, 0x0601, 0x0201, 0x008f, 0x0201, 0x00f8, 0x00f9, 0x0401, 0x0201, 0x009f, 0x00fa,
0x00af, 0x0801, 0x0401, 0x0201, 0x00fb, 0x00bf, 0x0201, 0x00fc, 0x00cf, 0x0401, 0x0201,
0x00fd, 0x00df, 0x0201, 0x00fe, 0x00ef,
// 24
0x3c01, 0x0801, 0x0401, 0x0201, 0x0000, 0x0010, 0x0201, 0x0001, 0x0011, 0x0e01, 0x0601,
0x0401, 0x0201, 0x0020, 0x0002, 0x0021, 0x0201, 0x0012, 0x0201, 0x0022, 0x0201, 0x0030,
0x0003, 0x0e01, 0x0401, 0x0201, 0x0031, 0x0013, 0x0401, 0x0201, 0x0032, 0x0023, 0x0401,
0x0201, 0x0040, 0x0004, 0x0041, 0x0801, 0x0401, 0x0201, 0x0014, 0x0033, 0x0201, 0x0042,
0x0024, 0x0601, 0x0401, 0x0201, 0x0043, 0x0034, 0x0051, 0x0601, 0x0401, 0x0201, 0x0050,
0x0005, 0x0015, 0x0201, 0x0052, 0x0025, 0xfa01, 0x6201, 0x2201, 0x1201, 0x0a01, 0x0401,
0x0201, 0x0044, 0x0053, 0x0201, 0x0035, 0x0201, 0x0060, 0x0006, 0x0401, 0x0201, 0x0061,
0x0016, 0x0201, 0x0062, 0x0026, 0x0801, 0x0401, 0x0201, 0x0054, 0x0045, 0x0201, 0x0063,
0x0036, 0x0401, 0x0201, 0x0071, 0x0055, 0x0201, 0x0064, 0x0046, 0x2001, 0x0e01, 0x0601,
0x0201, 0x0072, 0x0201, 0x0027, 0x0037, 0x0201, 0x0073, 0x0401, 0x0201, 0x0070, 0x0007,
0x0017, 0x0a01, 0x0401, 0x0201, 0x0065, 0x0056, 0x0401, 0x0201, 0x0080, 0x0008, 0x0081,
0x0401, 0x0201, 0x0074, 0x0047, 0x0201, 0x0018, 0x0082, 0x1001, 0x0801, 0x0401, 0x0201,
0x0028, 0x0066, 0x0201, 0x0083, 0x0038, 0x0401, 0x0201, 0x0075, 0x0057, 0x0201, 0x0084,
0x0048, 0x0801, 0x0401, 0x0201, 0x0091, 0x0019, 0x0201, 0x0092, 0x0076, 0x0401, 0x0201,
0x0067, 0x0029, 0x0201, 0x0085, 0x0058, 0x5c01, 0x2201, 0x1001, 0x0801, 0x0401, 0x0201,
0x0093, 0x0039, 0x0201, 0x0094, 0x0049, 0x0401, 0x0201, 0x0077, 0x0086, 0x0201, 0x0068,
0x00a1, 0x0801, 0x0401, 0x0201, 0x00a2, 0x002a, 0x0201, 0x0095, 0x0059, 0x0401, 0x0201,
0x00a3, 0x003a, 0x0201, 0x0087, 0x0201, 0x0078, 0x004a, 0x1601, 0x0c01, 0x0401, 0x0201,
0x00a4, 0x0096, 0x0401, 0x0201, 0x0069, 0x00b1, 0x0201, 0x001b, 0x00a5, 0x0601, 0x0201,
0x00b2, 0x0201, 0x005a, 0x002b, 0x0201, 0x0088, 0x00b3, 0x1001, 0x0a01, 0x0601, 0x0201,
0x0090, 0x0201, 0x0009, 0x00a0, 0x0201, 0x0097, 0x0079, 0x0401, 0x0201, 0x00a6, 0x006a,
0x00b4, 0x0c01, 0x0601, 0x0201, 0x001a, 0x0201, 0x000a, 0x00b0, 0x0201, 0x003b, 0x0201,
0x000b, 0x00c0, 0x0401, 0x0201, 0x004b, 0x00c1, 0x0201, 0x0098, 0x0089, 0x4301, 0x2201,
0x1001, 0x0801, 0x0401, 0x0201, 0x001c, 0x00b5, 0x0201, 0x005b, 0x00c2, 0x0401, 0x0201,
0x002c, 0x00a7, 0x0201, 0x007a, 0x00c3, 0x0a01, 0x0601, 0x0201, 0x003c, 0x0201, 0x000c,
0x00d0, 0x0201, 0x00b6, 0x006b, 0x0401, 0x0201, 0x00c4, 0x004c, 0x0201, 0x0099, 0x00a8,
0x1001, 0x0801, 0x0401, 0x0201, 0x008a, 0x00c5, 0x0201, 0x005c, 0x00d1, 0x0401, 0x0201,
0x00b7, 0x007b, 0x0201, 0x001d, 0x00d2, 0x0901, 0x0401, 0x0201, 0x002d, 0x00d3, 0x0201,
0x003d, 0x00c6, 0x55fa, 0x0401, 0x0201, 0x006c, 0x00a9, 0x0201, 0x009a, 0x00d4, 0x2001,
0x1001, 0x0801, 0x0401, 0x0201, 0x00b8, 0x008b, 0x0201, 0x004d, 0x00c7, 0x0401, 0x0201,
0x007c, 0x00d5, 0x0201, 0x005d, 0x00e1, 0x0801, 0x0401, 0x0201, 0x001e, 0x00e2, 0x0201,
0x00aa, 0x00b9, 0x0401, 0x0201, 0x009b, 0x00e3, 0x0201, 0x00d6, 0x006d, 0x1401, 0x0a01,
0x0601, 0x0201, 0x003e, 0x0201, 0x002e, 0x004e, 0x0201, 0x00c8, 0x008c, 0x0401, 0x0201,
0x00e4, 0x00d7, 0x0401, 0x0201, 0x007d, 0x00ab, 0x00e5, 0x0a01, 0x0401, 0x0201, 0x00ba,
0x005e, 0x0201, 0x00c9, 0x0201, 0x009c, 0x006e, 0x0801, 0x0201, 0x00e6, 0x0201, 0x000d,
0x0201, 0x00e0, 0x000e, 0x0401, 0x0201, 0x00d8, 0x008d, 0x0201, 0x00bb, 0x00ca, 0x4a01,
0x0201, 0x00ff, 0x4001, 0x3a01, 0x2001, 0x1001, 0x0801, 0x0401, 0x0201, 0x00ac, 0x00e7,
0x0201, 0x007e, 0x00d9, 0x0401, 0x0201, 0x009d, 0x00e8, 0x0201, 0x008e, 0x00cb, 0x0801,
0x0401, 0x0201, 0x00bc, 0x00da, 0x0201, 0x00ad, 0x00e9, 0x0401, 0x0201, 0x009e, 0x00cc,
0x0201, 0x00db, 0x00bd, 0x1001, 0x0801, 0x0401, 0x0201, 0x00ea, 0x00ae, 0x0201, 0x00dc,
0x00cd, 0x0401, 0x0201, 0x00eb, 0x00be, 0x0201, 0x00dd, 0x00ec, 0x0801, 0x0401, 0x0201,
0x00ce, 0x00ed, 0x0201, 0x00de, 0x00ee, 0x000f, 0x0401, 0x0201, 0x00f0, 0x001f, 0x00f1,
0x0401, 0x0201, 0x00f2, 0x002f, 0x0201, 0x00f3, 0x003f, 0x1201, 0x0801, 0x0401, 0x0201,
0x00f4, 0x004f, 0x0201, 0x00f5, 0x005f, 0x0401, 0x0201, 0x00f6, 0x006f, 0x0201, 0x00f7,
0x0201, 0x007f, 0x008f, 0x0a01, 0x0401, 0x0201, 0x00f8, 0x00f9, 0x0401, 0x0201, 0x009f,
0x00af, 0x00fa, 0x0801, 0x0401, 0x0201, 0x00fb, 0x00bf, 0x0201, 0x00fc, 0x00cf, 0x0401,
0x0201, 0x00fd, 0x00df, 0x0201, 0x00fe, 0x00ef,
// 32
0x0201, 0x0000, 0x0801, 0x0401, 0x0201, 0x0008, 0x0004, 0x0201, 0x0001, 0x0002, 0x0801,
0x0401, 0x0201, 0x000c, 0x000a, 0x0201, 0x0003, 0x0006, 0x0601, 0x0201, 0x0009, 0x0201,
0x0005, 0x0007, 0x0401, 0x0201, 0x000e, 0x000d, 0x0201, 0x000f, 0x000b,
// 33
0x1001, 0x0801, 0x0401, 0x0201, 0x0000, 0x0001, 0x0201, 0x0002, 0x0003, 0x0401, 0x0201,
0x0004, 0x0005, 0x0201, 0x0006, 0x0007, 0x0801, 0x0401, 0x0201, 0x0008, 0x0009, 0x0201,
0x000a, 0x000b, 0x0401, 0x0201, 0x000c, 0x000d, 0x0201, 0x000e, 0x000f,
}
type huffTables struct {
hufftable []uint16
treelen int
linbits int
}
var huffmanMain = [...]huffTables{
{nil, 0, 0}, /* Table 0 */
{huffmanTable, 7, 0}, /* Table 1 */
{huffmanTable[7:], 17, 0}, /* Table 2 */
{huffmanTable[24:], 17, 0}, /* Table 3 */
{nil, 0, 0}, /* Table 4 */
{huffmanTable[41:], 31, 0}, /* Table 5 */
{huffmanTable[72:], 31, 0}, /* Table 6 */
{huffmanTable[103:], 71, 0}, /* Table 7 */
{huffmanTable[174:], 71, 0}, /* Table 8 */
{huffmanTable[245:], 71, 0}, /* Table 9 */
{huffmanTable[316:], 127, 0}, /* Table 10 */
{huffmanTable[443:], 127, 0}, /* Table 11 */
{huffmanTable[570:], 127, 0}, /* Table 12 */
{huffmanTable[697:], 511, 0}, /* Table 13 */
{nil, 0, 0}, /* Table 14 */
{huffmanTable[1208:], 511, 0}, /* Table 15 */
{huffmanTable[1719:], 511, 1}, /* Table 16 */
{huffmanTable[1719:], 511, 2}, /* Table 17 */
{huffmanTable[1719:], 511, 3}, /* Table 18 */
{huffmanTable[1719:], 511, 4}, /* Table 19 */
{huffmanTable[1719:], 511, 6}, /* Table 20 */
{huffmanTable[1719:], 511, 8}, /* Table 21 */
{huffmanTable[1719:], 511, 10}, /* Table 22 */
{huffmanTable[1719:], 511, 13}, /* Table 23 */
{huffmanTable[2230:], 512, 4}, /* Table 24 */
{huffmanTable[2230:], 512, 5}, /* Table 25 */
{huffmanTable[2230:], 512, 6}, /* Table 26 */
{huffmanTable[2230:], 512, 7}, /* Table 27 */
{huffmanTable[2230:], 512, 8}, /* Table 28 */
{huffmanTable[2230:], 512, 9}, /* Table 29 */
{huffmanTable[2230:], 512, 11}, /* Table 30 */
{huffmanTable[2230:], 512, 13}, /* Table 31 */
{huffmanTable[2742:], 31, 0}, /* Table 32 */
{huffmanTable[2261:], 31, 0}, /* Table 33 */
}
func huffmanDecode(m *mainDataBytes, table_num int) (x, y, v, w int, err error) {
point := 0
error := 1
bitsleft := 32
treelen := huffmanMain[table_num].treelen
linbits := huffmanMain[table_num].linbits
if treelen == 0 { /* Check for empty tables */
return 0, 0, 0, 0, nil
}
htptr := huffmanMain[table_num].hufftable
for { /* Start reading the Huffman code word,bit by bit */
/* Check if we've matched a code word */
if (htptr[point] & 0xff00) == 0 {
error = 0
x = int((htptr[point] >> 4) & 0xf)
y = int(htptr[point] & 0xf)
break
}
if m.getMainBit() != 0 { /* Go right in tree */
for (htptr[point] & 0xff) >= 250 {
point += int(htptr[point]) & 0xff
}
point += int(htptr[point]) & 0xff
} else { /* Go left in tree */
for (htptr[point] >> 8) >= 250 {
point += int(htptr[point]) >> 8
}
point += int(htptr[point]) >> 8
}
bitsleft--
if !((bitsleft > 0) && (point < treelen)) {
break
}
}
if error != 0 { /* Check for error. */
err := fmt.Errorf("mp3: illegal Huff code in data. bleft = %d, point = %d. tab = %d.",
bitsleft, point, table_num)
return 0, 0, 0, 0, err
}
if table_num > 31 { /* Process sign encodings for quadruples tables. */
v = (y >> 3) & 1
w = (y >> 2) & 1
x = (y >> 1) & 1
y = y & 1
if (v > 0) && (m.getMainBit() == 1) {
v = -v
}
if (w > 0) && (m.getMainBit() == 1) {
w = -w
}
if (x > 0) && (m.getMainBit() == 1) {
x = -x
}
if (y > 0) && (m.getMainBit() == 1) {
y = -y
}
} else {
if (linbits > 0) && (x == 15) {
x += m.getMainBits(linbits) /* Get linbits */
}
if (x > 0) && (m.getMainBit() == 1) {
x = -x /* Get sign bit */
}
if (linbits > 0) && (y == 15) {
y += m.getMainBits(linbits) /* Get linbits */
}
if (y > 0) && (m.getMainBit() == 1) {
y = -y /* Get sign bit */
}
}
return x, y, v, w, nil
}

250
imdct.go Normal file
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@ -0,0 +1,250 @@
// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
var imdctWinData = [4][36]float32{
{
0.043619, 0.130526, 0.216440, 0.300706, 0.382683, 0.461749,
0.537300, 0.608761, 0.675590, 0.737277, 0.793353, 0.843391,
0.887011, 0.923880, 0.953717, 0.976296, 0.991445, 0.999048,
0.999048, 0.991445, 0.976296, 0.953717, 0.923879, 0.887011,
0.843391, 0.793353, 0.737277, 0.675590, 0.608761, 0.537299,
0.461748, 0.382683, 0.300706, 0.216439, 0.130526, 0.043619,
},
{
0.043619, 0.130526, 0.216440, 0.300706, 0.382683, 0.461749,
0.537300, 0.608761, 0.675590, 0.737277, 0.793353, 0.843391,
0.887011, 0.923880, 0.953717, 0.976296, 0.991445, 0.999048,
1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
0.991445, 0.923880, 0.793353, 0.608761, 0.382683, 0.130526,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
},
{
0.130526, 0.382683, 0.608761, 0.793353, 0.923880, 0.991445,
0.991445, 0.923880, 0.793353, 0.608761, 0.382683, 0.130526,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
},
{
0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000,
0.130526, 0.382683, 0.608761, 0.793353, 0.923880, 0.991445,
1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
0.999048, 0.991445, 0.976296, 0.953717, 0.923879, 0.887011,
0.843391, 0.793353, 0.737277, 0.675590, 0.608761, 0.537299,
0.461748, 0.382683, 0.300706, 0.216439, 0.130526, 0.043619,
},
}
var cosN12 = [6][12]float32{
{
0.608761, 0.382683, 0.130526, -0.130526, -0.382683, -0.608761,
-0.793353, -0.923880, -0.991445, -0.991445, -0.923879, -0.793353,
},
{
-0.923880, -0.923879, -0.382683, 0.382684, 0.923880, 0.923879,
0.382683, -0.382684, -0.923880, -0.923879, -0.382683, 0.382684,
},
{
-0.130526, 0.923880, 0.608761, -0.608762, -0.923879, 0.130526,
0.991445, 0.382683, -0.793354, -0.793353, 0.382684, 0.991445,
},
{
0.991445, -0.382684, -0.793353, 0.793354, 0.382683, -0.991445,
0.130527, 0.923879, -0.608762, -0.608761, 0.923880, 0.130525,
},
{
-0.382684, -0.382683, 0.923879, -0.923880, 0.382684, 0.382683,
-0.923879, 0.923880, -0.382684, -0.382683, 0.923879, -0.923880,
},
{
-0.793353, 0.923879, -0.991445, 0.991445, -0.923880, 0.793354,
-0.608762, 0.382684, -0.130527, -0.130525, 0.382682, -0.608761,
},
}
var cosN36 = [18][36]float32{
{
0.675590, 0.608761, 0.537300, 0.461749, 0.382683, 0.300706,
0.216440, 0.130526, 0.043619, -0.043619, -0.130526, -0.216440,
-0.300706, -0.382684, -0.461749, -0.537300, -0.608762, -0.675590,
-0.737277, -0.793353, -0.843392, -0.887011, -0.923880, -0.953717,
-0.976296, -0.991445, -0.999048, -0.999048, -0.991445, -0.976296,
-0.953717, -0.923879, -0.887011, -0.843391, -0.793353, -0.737277,
},
{
-0.793353, -0.923880, -0.991445, -0.991445, -0.923879, -0.793353,
-0.608761, -0.382683, -0.130526, 0.130526, 0.382684, 0.608762,
0.793354, 0.923880, 0.991445, 0.991445, 0.923879, 0.793353,
0.608761, 0.382683, 0.130526, -0.130527, -0.382684, -0.608762,
-0.793354, -0.923880, -0.991445, -0.991445, -0.923879, -0.793353,
-0.608761, -0.382683, -0.130526, 0.130527, 0.382684, 0.608762,
},
{
-0.537299, -0.130526, 0.300706, 0.675590, 0.923880, 0.999048,
0.887011, 0.608761, 0.216439, -0.216440, -0.608762, -0.887011,
-0.999048, -0.923879, -0.675590, -0.300705, 0.130527, 0.537300,
0.843392, 0.991445, 0.953717, 0.737277, 0.382683, -0.043620,
-0.461749, -0.793354, -0.976296, -0.976296, -0.793353, -0.461748,
-0.043618, 0.382684, 0.737278, 0.953717, 0.991445, 0.843391,
},
{
0.887011, 0.991445, 0.737277, 0.216439, -0.382684, -0.843392,
-0.999048, -0.793353, -0.300705, 0.300706, 0.793354, 0.999048,
0.843391, 0.382683, -0.216440, -0.737278, -0.991445, -0.887010,
-0.461748, 0.130527, 0.675591, 0.976296, 0.923879, 0.537299,
-0.043621, -0.608762, -0.953717, -0.953717, -0.608760, -0.043618,
0.537301, 0.923880, 0.976296, 0.675589, 0.130525, -0.461750,
},
{
0.382683, -0.382684, -0.923880, -0.923879, -0.382683, 0.382684,
0.923880, 0.923879, 0.382683, -0.382684, -0.923880, -0.923879,
-0.382683, 0.382684, 0.923880, 0.923879, 0.382682, -0.382685,
-0.923880, -0.923879, -0.382682, 0.382685, 0.923880, 0.923879,
0.382682, -0.382685, -0.923880, -0.923879, -0.382682, 0.382685,
0.923880, 0.923879, 0.382682, -0.382685, -0.923880, -0.923879,
},
{
0.953717, -0.793353, 0.043620, 0.843392, 0.923879, 0.216439,
-0.675591, -0.991445, -0.461748, 0.461749, 0.991445, 0.675589,
-0.216441, -0.923880, -0.843391, -0.043618, 0.793354, 0.953717,
0.300704, -0.608763, -0.999048, -0.537298, 0.382685, 0.976296,
0.737276, -0.130528, -0.887012, -0.887010, -0.130524, 0.737279,
0.976296, 0.382681, -0.537301, -0.999048, -0.608760, 0.300708,
},
{
-0.216439, 0.793354, 0.887010, -0.043620, -0.923880, -0.737277,
0.300707, 0.991445, 0.537299, -0.537301, -0.991445, -0.300705,
0.737278, 0.923879, 0.043618, -0.887012, -0.793352, 0.216441,
0.976296, 0.608760, -0.461750, -0.999048, -0.382682, 0.675592,
0.953716, 0.130524, -0.843393, -0.843390, 0.130529, 0.953718,
0.675588, -0.382686, -0.999048, -0.461746, 0.608764, 0.976295,
},
{
0.991445, 0.382683, -0.793354, -0.793353, 0.382684, 0.991445,
0.130525, -0.923880, -0.608760, 0.608763, 0.923879, -0.130528,
-0.991445, -0.382682, 0.793354, 0.793352, -0.382685, -0.991445,
-0.130524, 0.923880, 0.608760, -0.608763, -0.923879, 0.130529,
0.991445, 0.382681, -0.793355, -0.793352, 0.382686, 0.991444,
0.130523, -0.923881, -0.608759, 0.608764, 0.923878, -0.130529,
},
{
0.043619, -0.991445, -0.216439, 0.953717, 0.382682, -0.887011,
-0.537299, 0.793354, 0.675589, -0.675591, -0.793352, 0.537301,
0.887010, -0.382685, -0.953716, 0.216442, 0.991445, -0.043622,
-0.999048, -0.130524, 0.976297, 0.300703, -0.923881, -0.461746,
0.843393, 0.608759, -0.737279, -0.737275, 0.608764, 0.843390,
-0.461752, -0.923878, 0.300709, 0.976295, -0.130530, -0.999048,
},
{
-0.999048, 0.130527, 0.976296, -0.300707, -0.923879, 0.461750,
0.843391, -0.608763, -0.737276, 0.737279, 0.608760, -0.843392,
-0.461747, 0.923880, 0.300704, -0.976297, -0.130524, 0.999048,
-0.043622, -0.991445, 0.216442, 0.953716, -0.382686, -0.887009,
0.537302, 0.793351, -0.675593, -0.675588, 0.793355, 0.537297,
-0.887013, -0.382680, 0.953718, 0.216436, -0.991445, -0.043615,
},
{
0.130527, 0.923879, -0.608762, -0.608760, 0.923880, 0.130525,
-0.991445, 0.382685, 0.793352, -0.793355, -0.382682, 0.991445,
-0.130528, -0.923879, 0.608763, 0.608759, -0.923881, -0.130523,
0.991444, -0.382686, -0.793351, 0.793355, 0.382680, -0.991445,
0.130530, 0.923878, -0.608764, -0.608758, 0.923881, 0.130522,
-0.991444, 0.382687, 0.793351, -0.793356, -0.382679, 0.991445,
},
{
0.976296, -0.608762, -0.461747, 0.999048, -0.382685, -0.675589,
0.953717, -0.130528, -0.843390, 0.843393, 0.130524, -0.953716,
0.675592, 0.382681, -0.999048, 0.461751, 0.608759, -0.976297,
0.216443, 0.793351, -0.887012, -0.043616, 0.923878, -0.737280,
-0.300702, 0.991444, -0.537303, -0.537296, 0.991445, -0.300710,
-0.737274, 0.923881, -0.043624, -0.887009, 0.793356, 0.216435,
},
{
-0.300707, -0.608760, 0.999048, -0.537301, -0.382682, 0.976296,
-0.737279, -0.130524, 0.887010, -0.887012, 0.130529, 0.737276,
-0.976297, 0.382686, 0.537297, -0.999048, 0.608764, 0.300703,
-0.953716, 0.793355, 0.043616, -0.843389, 0.923881, -0.216444,
-0.675587, 0.991445, -0.461752, -0.461745, 0.991444, -0.675594,
-0.216435, 0.923878, -0.843394, 0.043625, 0.793350, -0.953719,
},
{
-0.923879, 0.923880, -0.382685, -0.382682, 0.923879, -0.923880,
0.382685, 0.382681, -0.923879, 0.923880, -0.382686, -0.382681,
0.923878, -0.923881, 0.382686, 0.382680, -0.923878, 0.923881,
-0.382687, -0.382680, 0.923878, -0.923881, 0.382687, 0.382679,
-0.923878, 0.923881, -0.382688, -0.382679, 0.923878, -0.923881,
0.382688, 0.382678, -0.923877, 0.923882, -0.382689, -0.382678,
},
{
0.461750, 0.130525, -0.675589, 0.976296, -0.923880, 0.537301,
0.043617, -0.608760, 0.953716, -0.953718, 0.608764, -0.043622,
-0.537297, 0.923878, -0.976297, 0.675593, -0.130530, -0.461745,
0.887009, -0.991445, 0.737280, -0.216444, -0.382679, 0.843389,
-0.999048, 0.793356, -0.300711, -0.300701, 0.793350, -0.999048,
0.843394, -0.382689, -0.216434, 0.737273, -0.991444, 0.887014,
},
{
0.843391, -0.991445, 0.953717, -0.737279, 0.382685, 0.043617,
-0.461747, 0.793352, -0.976295, 0.976297, -0.793355, 0.461751,
-0.043623, -0.382680, 0.737275, -0.953716, 0.991445, -0.843394,
0.537303, -0.130530, -0.300702, 0.675587, -0.923878, 0.999048,
-0.887013, 0.608766, -0.216445, -0.216434, 0.608757, -0.887008,
0.999048, -0.923882, 0.675595, -0.300712, -0.130520, 0.537294,
},
{
-0.608763, 0.382685, -0.130528, -0.130524, 0.382681, -0.608760,
0.793352, -0.923879, 0.991444, -0.991445, 0.923881, -0.793355,
0.608764, -0.382687, 0.130530, 0.130522, -0.382680, 0.608758,
-0.793351, 0.923878, -0.991444, 0.991446, -0.923881, 0.793357,
-0.608766, 0.382689, -0.130532, -0.130520, 0.382678, -0.608756,
0.793349, -0.923877, 0.991444, -0.991446, 0.923882, -0.793358,
},
{
-0.737276, 0.793352, -0.843390, 0.887010, -0.923879, 0.953716,
-0.976295, 0.991444, -0.999048, 0.999048, -0.991445, 0.976297,
-0.953718, 0.923881, -0.887013, 0.843394, -0.793356, 0.737280,
-0.675594, 0.608765, -0.537304, 0.461753, -0.382688, 0.300711,
-0.216445, 0.130532, -0.043625, -0.043613, 0.130520, -0.216433,
0.300699, -0.382677, 0.461742, -0.537293, 0.608755, -0.675585,
},
}
func imdctWin(in []float32, blockType int) []float32 {
out := make([]float32, 36)
if blockType == 2 {
N := 12
for i := 0; i < 3; i++ {
for p := 0; p < N; p++ {
sum := float32(0.0)
for m := 0; m < N/2; m++ {
sum += in[i+3*m] * cosN12[m][p]
}
out[6*i+p+6] += sum * imdctWinData[blockType][p]
}
}
return out
}
N := 36
for p := 0; p < N; p++ {
sum := float32(0.0)
for m := 0; m < N/2; m++ {
sum += in[m] * cosN36[m][p]
}
out[p] = sum * imdctWinData[blockType][p]
}
return out
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"math"
)
var (
powtab34 = make([]float64, 8207)
pretab = []float64{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2}
)
func init() {
for i := range powtab34 {
powtab34[i] = math.Pow(float64(i), 4.0/3.0)
}
}
func (f *frame) requantizeProcessLong(gr, ch, is_pos, sfb int) {
sf_mult := 0.5
if f.sideInfo.scalefac_scale[gr][ch] != 0 {
sf_mult = 1.0
}
tmp1 := 1.0
// https://github.com/technosaurus/PDMP3/issues/4
if sfb < 21 {
pf_x_pt := float64(f.sideInfo.preflag[gr][ch]) * pretab[sfb]
tmp1 = math.Pow(2.0, -(sf_mult * (float64(f.mainData.scalefac_l[gr][ch][sfb]) + pf_x_pt)))
}
tmp2 := math.Pow(2.0, 0.25*(float64(f.sideInfo.global_gain[gr][ch])-210))
tmp3 := 0.0
if f.mainData.is[gr][ch][is_pos] < 0.0 {
tmp3 = -powtab34[int(-f.mainData.is[gr][ch][is_pos])]
} else {
tmp3 = powtab34[int(f.mainData.is[gr][ch][is_pos])]
}
f.mainData.is[gr][ch][is_pos] = float32(tmp1 * tmp2 * tmp3)
}
func (f *frame) requantizeProcessShort(gr, ch, is_pos, sfb, win int) {
sf_mult := 0.5
if f.sideInfo.scalefac_scale[gr][ch] != 0 {
sf_mult = 1.0
}
tmp1 := 1.0
// https://github.com/technosaurus/PDMP3/issues/4
if sfb < 12 {
tmp1 = math.Pow(2.0, -(sf_mult * float64(f.mainData.scalefac_s[gr][ch][sfb][win])))
}
tmp2 := math.Pow(2.0, 0.25*(float64(f.sideInfo.global_gain[gr][ch])-210.0-
8.0*float64(f.sideInfo.subblock_gain[gr][ch][win])))
tmp3 := 0.0
if f.mainData.is[gr][ch][is_pos] < 0 {
tmp3 = -powtab34[int(-f.mainData.is[gr][ch][is_pos])]
} else {
tmp3 = powtab34[int(f.mainData.is[gr][ch][is_pos])]
}
f.mainData.is[gr][ch][is_pos] = float32(tmp1 * tmp2 * tmp3)
}
type sfBandIndices struct {
l []int
s []int
}
var (
sfBandIndicesSet = []sfBandIndices{
{
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},
s: []int{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192},
},
{
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},
s: []int{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192},
},
{
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},
s: []int{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192},
},
}
)
func (f *frame) l3Requantize(gr int, ch int) {
// Setup sampling frequency index
sfreq := f.header.sampling_frequency
// Determine type of block to process
if (f.sideInfo.win_switch_flag[gr][ch] == 1) && (f.sideInfo.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 f.sideInfo.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]
}
f.requantizeProcessLong(gr, ch, i, 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(f.sideInfo.count1[gr][ch]); /* i++ done below! */ {
// Check if we're into the next scalefac band
if i == next_sfb {
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++ {
f.requantizeProcessShort(gr, ch, i, sfb, 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(f.sideInfo.count1[gr][ch]); /* i++ done below! */ {
// Check if we're into the next scalefac band
if i == next_sfb {
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++ {
f.requantizeProcessShort(gr, ch, i, sfb, win)
i++
}
}
}
}
} else { // Only long blocks
sfb := 0
next_sfb := sfBandIndicesSet[sfreq].l[sfb+1]
for i := 0; i < int(f.sideInfo.count1[gr][ch]); i++ {
if i == next_sfb {
sfb++
next_sfb = sfBandIndicesSet[sfreq].l[sfb+1]
}
f.requantizeProcessLong(gr, ch, i, sfb)
}
}
}
func (f *frame) l3Reorder(gr int, ch int) {
re := make([]float32, 576)
sfreq := f.header.sampling_frequency // Setup sampling freq index
// Only reorder short blocks
if (f.sideInfo.win_switch_flag[gr][ch] == 1) && (f.sideInfo.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
sfb := 0
// 2 longbl. sb first
if f.sideInfo.mixed_block_flag[gr][ch] != 0 {
sfb = 3
}
next_sfb := sfBandIndicesSet[sfreq].s[sfb+1] * 3
win_len := sfBandIndicesSet[sfreq].s[sfb+1] - sfBandIndicesSet[sfreq].s[sfb]
i := 36
if sfb == 0 {
i = 0
}
for i < 576 {
// Check if we're into the next scalefac band
if i == next_sfb {
// Copy reordered data back to the original vector
for j := 0; j < 3*win_len; j++ {
f.mainData.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
if i >= f.sideInfo.count1[gr][ch] {
return
}
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++ { // Do the actual reordering
for j := 0; j < win_len; j++ {
re[j*3+win] = f.mainData.is[gr][ch][i]
i++
}
}
}
// Copy reordered data of last band back to original vector
for j := 0; j < 3*win_len; j++ {
f.mainData.is[gr][ch][3*sfBandIndicesSet[sfreq].s[12]+j] = re[j]
}
}
}
var (
isRatios = []float32{0.000000, 0.267949, 0.577350, 1.000000, 1.732051, 3.732051}
)
func (f *frame) stereoProcessIntensityLong(gr int, sfb int) {
is_ratio_l := float32(0)
is_ratio_r := float32(0)
// Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo
is_pos := f.mainData.scalefac_l[gr][0][sfb]
if is_pos != 7 {
sfreq := f.header.sampling_frequency // Setup sampling freq index
sfb_start := sfBandIndicesSet[sfreq].l[sfb]
sfb_stop := sfBandIndicesSet[sfreq].l[sfb+1]
if is_pos == 6 { // tan((6*PI)/12 = PI/2) needs special treatment!
is_ratio_l = 1.0
is_ratio_r = 0.0
} else {
is_ratio_l = isRatios[is_pos] / (1.0 + isRatios[is_pos])
is_ratio_r = 1.0 / (1.0 + isRatios[is_pos])
}
// Now decode all samples in this scale factor band
for i := sfb_start; i < sfb_stop; i++ {
f.mainData.is[gr][0][i] *= is_ratio_l
f.mainData.is[gr][1][i] *= is_ratio_r
}
}
}
func (f *frame) stereoProcessIntensityShort(gr int, sfb int) {
is_ratio_l := float32(0)
is_ratio_r := float32(0)
sfreq := f.header.sampling_frequency // Setup sampling freq index
// The window length
win_len := sfBandIndicesSet[sfreq].s[sfb+1] - sfBandIndicesSet[sfreq].s[sfb]
// The three windows within the band has different scalefactors
for win := 0; win < 3; win++ {
// Check that((is_pos[sfb]=scalefac) != 7) => no intensity stereo
is_pos := f.mainData.scalefac_s[gr][0][sfb][win]
if is_pos != 7 {
sfb_start := sfBandIndicesSet[sfreq].s[sfb]*3 + win_len*win
sfb_stop := sfb_start + win_len
if is_pos == 6 { // tan((6*PI)/12 = PI/2) needs special treatment!
is_ratio_l = 1.0
is_ratio_r = 0.0
} else {
is_ratio_l = isRatios[is_pos] / (1.0 + isRatios[is_pos])
is_ratio_r = 1.0 / (1.0 + isRatios[is_pos])
}
// Now decode all samples in this scale factor band
for i := sfb_start; i < sfb_stop; i++ {
// https://github.com/technosaurus/PDMP3/issues/3
f.mainData.is[gr][0][i] *= is_ratio_l
f.mainData.is[gr][1][i] *= is_ratio_r
}
}
}
}
func (f *frame) l3Stereo(gr int) {
// Do nothing if joint stereo is not enabled
if (f.header.mode != 1) || (f.header.mode_extension == 0) {
return
}
// Do Middle/Side("normal") stereo processing
if (f.header.mode_extension & 0x2) != 0 {
// Determine how many frequency lines to transform
i := 0
if f.sideInfo.count1[gr][0] > f.sideInfo.count1[gr][1] {
i = 1
}
max_pos := int(f.sideInfo.count1[gr][i])
// Do the actual processing
const invSqrt2 = math.Sqrt2 / 2
for i := 0; i < max_pos; i++ {
left := (f.mainData.is[gr][0][i] + f.mainData.is[gr][1][i]) * invSqrt2
right := (f.mainData.is[gr][0][i] - f.mainData.is[gr][1][i]) * invSqrt2
f.mainData.is[gr][0][i] = left
f.mainData.is[gr][1][i] = right
}
}
// Do intensity stereo processing
if (f.header.mode_extension & 0x1) != 0 {
// Setup sampling frequency index
sfreq := f.header.sampling_frequency
// First band that is intensity stereo encoded is first band scale factor
// band on or above count1 frequency line. N.B.: Intensity stereo coding is
// only done for higher subbands, but logic is here for lower subbands.
// Determine type of block to process
if (f.sideInfo.win_switch_flag[gr][0] == 1) &&
(f.sideInfo.block_type[gr][0] == 2) { // Short blocks
// Check if the first two subbands
// (=2*18 samples = 8 long or 3 short sfb's) uses long blocks
if f.sideInfo.mixed_block_flag[gr][0] != 0 { // 2 longbl. sb first
for sfb := 0; sfb < 8; sfb++ { // First process 8 sfb's at start
// Is this scale factor band above count1 for the right channel?
if sfBandIndicesSet[sfreq].l[sfb] >= f.sideInfo.count1[gr][1] {
f.stereoProcessIntensityLong(gr, sfb)
}
}
// And next the remaining bands which uses short blocks
for sfb := 3; sfb < 12; sfb++ {
// Is this scale factor band above count1 for the right channel?
if sfBandIndicesSet[sfreq].s[sfb]*3 >= f.sideInfo.count1[gr][1] {
f.stereoProcessIntensityShort(gr, sfb) // intensity stereo processing
}
}
} else { // Only short blocks
for sfb := 0; sfb < 12; sfb++ {
// Is this scale factor band above count1 for the right channel?
if sfBandIndicesSet[sfreq].s[sfb]*3 >= f.sideInfo.count1[gr][1] {
f.stereoProcessIntensityShort(gr, sfb) // intensity stereo processing
}
}
}
} else { // Only long blocks
for sfb := 0; sfb < 21; sfb++ {
// Is this scale factor band above count1 for the right channel?
if sfBandIndicesSet[sfreq].l[sfb] >= f.sideInfo.count1[gr][1] {
// Perform the intensity stereo processing
f.stereoProcessIntensityLong(gr, sfb)
}
}
}
}
}
var (
cs = []float32{0.857493, 0.881742, 0.949629, 0.983315, 0.995518, 0.999161, 0.999899, 0.999993}
ca = []float32{-0.514496, -0.471732, -0.313377, -0.181913, -0.094574, -0.040966, -0.014199, -0.003700}
)
func (f *frame) l3Antialias(gr int, ch int) {
// No antialiasing is done for short blocks
if (f.sideInfo.win_switch_flag[gr][ch] == 1) &&
(f.sideInfo.block_type[gr][ch] == 2) &&
(f.sideInfo.mixed_block_flag[gr][ch]) == 0 {
return
}
// Setup the limit for how many subbands to transform
sblim := 32
if (f.sideInfo.win_switch_flag[gr][ch] == 1) &&
(f.sideInfo.block_type[gr][ch] == 2) &&
(f.sideInfo.mixed_block_flag[gr][ch] == 1) {
sblim = 2
}
// Do the actual antialiasing
for sb := 1; sb < sblim; sb++ {
for i := 0; i < 8; i++ {
li := 18*sb - 1 - i
ui := 18*sb + i
lb := f.mainData.is[gr][ch][li]*cs[i] - f.mainData.is[gr][ch][ui]*ca[i]
ub := f.mainData.is[gr][ch][ui]*cs[i] + f.mainData.is[gr][ch][li]*ca[i]
f.mainData.is[gr][ch][li] = lb
f.mainData.is[gr][ch][ui] = ub
}
}
}
func (f *frame) l3HybridSynthesis(gr int, ch int) {
// Loop through all 32 subbands
for sb := 0; sb < 32; sb++ {
// Determine blocktype for this subband
bt := int(f.sideInfo.block_type[gr][ch])
if (f.sideInfo.win_switch_flag[gr][ch] == 1) &&
(f.sideInfo.mixed_block_flag[gr][ch] == 1) && (sb < 2) {
bt = 0
}
// Do the inverse modified DCT and windowing
in := make([]float32, 18)
for i := range in {
in[i] = f.mainData.is[gr][ch][sb*18+i]
}
rawout := imdctWin(in, bt)
// Overlapp add with stored vector into main_data vector
for i := 0; i < 18; i++ {
f.mainData.is[gr][ch][sb*18+i] = rawout[i] + f.store[ch][sb][i]
f.store[ch][sb][i] = rawout[i+18]
}
}
}
func (f *frame) 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 {
f.mainData.is[gr][ch][sb*18+i] = -f.mainData.is[gr][ch][sb*18+i]
}
}
}
var synthNWin = [64][32]float32{}
func init() {
for i := 0; i < 64; i++ {
for j := 0; j < 32; j++ {
synthNWin[i][j] =
float32(math.Cos(float64((16+i)*(2*j+1)) * (math.Pi / 64.0)))
}
}
}
var synthDtbl = [512]float32{
0.000000000, -0.000015259, -0.000015259, -0.000015259,
-0.000015259, -0.000015259, -0.000015259, -0.000030518,
-0.000030518, -0.000030518, -0.000030518, -0.000045776,
-0.000045776, -0.000061035, -0.000061035, -0.000076294,
-0.000076294, -0.000091553, -0.000106812, -0.000106812,
-0.000122070, -0.000137329, -0.000152588, -0.000167847,
-0.000198364, -0.000213623, -0.000244141, -0.000259399,
-0.000289917, -0.000320435, -0.000366211, -0.000396729,
-0.000442505, -0.000473022, -0.000534058, -0.000579834,
-0.000625610, -0.000686646, -0.000747681, -0.000808716,
-0.000885010, -0.000961304, -0.001037598, -0.001113892,
-0.001205444, -0.001296997, -0.001388550, -0.001480103,
-0.001586914, -0.001693726, -0.001785278, -0.001907349,
-0.002014160, -0.002120972, -0.002243042, -0.002349854,
-0.002456665, -0.002578735, -0.002685547, -0.002792358,
-0.002899170, -0.002990723, -0.003082275, -0.003173828,
0.003250122, 0.003326416, 0.003387451, 0.003433228,
0.003463745, 0.003479004, 0.003479004, 0.003463745,
0.003417969, 0.003372192, 0.003280640, 0.003173828,
0.003051758, 0.002883911, 0.002700806, 0.002487183,
0.002227783, 0.001937866, 0.001617432, 0.001266479,
0.000869751, 0.000442505, -0.000030518, -0.000549316,
-0.001098633, -0.001693726, -0.002334595, -0.003005981,
-0.003723145, -0.004486084, -0.005294800, -0.006118774,
-0.007003784, -0.007919312, -0.008865356, -0.009841919,
-0.010848999, -0.011886597, -0.012939453, -0.014022827,
-0.015121460, -0.016235352, -0.017349243, -0.018463135,
-0.019577026, -0.020690918, -0.021789551, -0.022857666,
-0.023910522, -0.024932861, -0.025909424, -0.026840210,
-0.027725220, -0.028533936, -0.029281616, -0.029937744,
-0.030532837, -0.031005859, -0.031387329, -0.031661987,
-0.031814575, -0.031845093, -0.031738281, -0.031478882,
0.031082153, 0.030517578, 0.029785156, 0.028884888,
0.027801514, 0.026535034, 0.025085449, 0.023422241,
0.021575928, 0.019531250, 0.017257690, 0.014801025,
0.012115479, 0.009231567, 0.006134033, 0.002822876,
-0.000686646, -0.004394531, -0.008316040, -0.012420654,
-0.016708374, -0.021179199, -0.025817871, -0.030609131,
-0.035552979, -0.040634155, -0.045837402, -0.051132202,
-0.056533813, -0.061996460, -0.067520142, -0.073059082,
-0.078628540, -0.084182739, -0.089706421, -0.095169067,
-0.100540161, -0.105819702, -0.110946655, -0.115921021,
-0.120697021, -0.125259399, -0.129562378, -0.133590698,
-0.137298584, -0.140670776, -0.143676758, -0.146255493,
-0.148422241, -0.150115967, -0.151306152, -0.151962280,
-0.152069092, -0.151596069, -0.150497437, -0.148773193,
-0.146362305, -0.143264771, -0.139450073, -0.134887695,
-0.129577637, -0.123474121, -0.116577148, -0.108856201,
0.100311279, 0.090927124, 0.080688477, 0.069595337,
0.057617188, 0.044784546, 0.031082153, 0.016510010,
0.001068115, -0.015228271, -0.032379150, -0.050354004,
-0.069168091, -0.088775635, -0.109161377, -0.130310059,
-0.152206421, -0.174789429, -0.198059082, -0.221984863,
-0.246505737, -0.271591187, -0.297210693, -0.323318481,
-0.349868774, -0.376800537, -0.404083252, -0.431655884,
-0.459472656, -0.487472534, -0.515609741, -0.543823242,
-0.572036743, -0.600219727, -0.628295898, -0.656219482,
-0.683914185, -0.711318970, -0.738372803, -0.765029907,
-0.791213989, -0.816864014, -0.841949463, -0.866363525,
-0.890090942, -0.913055420, -0.935195923, -0.956481934,
-0.976852417, -0.996246338, -1.014617920, -1.031936646,
-1.048156738, -1.063217163, -1.077117920, -1.089782715,
-1.101211548, -1.111373901, -1.120223999, -1.127746582,
-1.133926392, -1.138763428, -1.142211914, -1.144287109,
1.144989014, 1.144287109, 1.142211914, 1.138763428,
1.133926392, 1.127746582, 1.120223999, 1.111373901,
1.101211548, 1.089782715, 1.077117920, 1.063217163,
1.048156738, 1.031936646, 1.014617920, 0.996246338,
0.976852417, 0.956481934, 0.935195923, 0.913055420,
0.890090942, 0.866363525, 0.841949463, 0.816864014,
0.791213989, 0.765029907, 0.738372803, 0.711318970,
0.683914185, 0.656219482, 0.628295898, 0.600219727,
0.572036743, 0.543823242, 0.515609741, 0.487472534,
0.459472656, 0.431655884, 0.404083252, 0.376800537,
0.349868774, 0.323318481, 0.297210693, 0.271591187,
0.246505737, 0.221984863, 0.198059082, 0.174789429,
0.152206421, 0.130310059, 0.109161377, 0.088775635,
0.069168091, 0.050354004, 0.032379150, 0.015228271,
-0.001068115, -0.016510010, -0.031082153, -0.044784546,
-0.057617188, -0.069595337, -0.080688477, -0.090927124,
0.100311279, 0.108856201, 0.116577148, 0.123474121,
0.129577637, 0.134887695, 0.139450073, 0.143264771,
0.146362305, 0.148773193, 0.150497437, 0.151596069,
0.152069092, 0.151962280, 0.151306152, 0.150115967,
0.148422241, 0.146255493, 0.143676758, 0.140670776,
0.137298584, 0.133590698, 0.129562378, 0.125259399,
0.120697021, 0.115921021, 0.110946655, 0.105819702,
0.100540161, 0.095169067, 0.089706421, 0.084182739,
0.078628540, 0.073059082, 0.067520142, 0.061996460,
0.056533813, 0.051132202, 0.045837402, 0.040634155,
0.035552979, 0.030609131, 0.025817871, 0.021179199,
0.016708374, 0.012420654, 0.008316040, 0.004394531,
0.000686646, -0.002822876, -0.006134033, -0.009231567,
-0.012115479, -0.014801025, -0.017257690, -0.019531250,
-0.021575928, -0.023422241, -0.025085449, -0.026535034,
-0.027801514, -0.028884888, -0.029785156, -0.030517578,
0.031082153, 0.031478882, 0.031738281, 0.031845093,
0.031814575, 0.031661987, 0.031387329, 0.031005859,
0.030532837, 0.029937744, 0.029281616, 0.028533936,
0.027725220, 0.026840210, 0.025909424, 0.024932861,
0.023910522, 0.022857666, 0.021789551, 0.020690918,
0.019577026, 0.018463135, 0.017349243, 0.016235352,
0.015121460, 0.014022827, 0.012939453, 0.011886597,
0.010848999, 0.009841919, 0.008865356, 0.007919312,
0.007003784, 0.006118774, 0.005294800, 0.004486084,
0.003723145, 0.003005981, 0.002334595, 0.001693726,
0.001098633, 0.000549316, 0.000030518, -0.000442505,
-0.000869751, -0.001266479, -0.001617432, -0.001937866,
-0.002227783, -0.002487183, -0.002700806, -0.002883911,
-0.003051758, -0.003173828, -0.003280640, -0.003372192,
-0.003417969, -0.003463745, -0.003479004, -0.003479004,
-0.003463745, -0.003433228, -0.003387451, -0.003326416,
0.003250122, 0.003173828, 0.003082275, 0.002990723,
0.002899170, 0.002792358, 0.002685547, 0.002578735,
0.002456665, 0.002349854, 0.002243042, 0.002120972,
0.002014160, 0.001907349, 0.001785278, 0.001693726,
0.001586914, 0.001480103, 0.001388550, 0.001296997,
0.001205444, 0.001113892, 0.001037598, 0.000961304,
0.000885010, 0.000808716, 0.000747681, 0.000686646,
0.000625610, 0.000579834, 0.000534058, 0.000473022,
0.000442505, 0.000396729, 0.000366211, 0.000320435,
0.000289917, 0.000259399, 0.000244141, 0.000213623,
0.000198364, 0.000167847, 0.000152588, 0.000137329,
0.000122070, 0.000106812, 0.000106812, 0.000091553,
0.000076294, 0.000076294, 0.000061035, 0.000061035,
0.000045776, 0.000045776, 0.000030518, 0.000030518,
0.000030518, 0.000030518, 0.000015259, 0.000015259,
0.000015259, 0.000015259, 0.000015259, 0.000015259,
}
func (f *frame) l3SubbandSynthesis(gr int, ch int, out []uint8) {
u_vec := make([]float32, 512)
s_vec := make([]float32, 32)
nch := f.header.numberOfChannels()
// Setup the n_win windowing vector and the v_vec intermediate vector
for ss := 0; ss < 18; ss++ { // Loop through 18 samples in 32 subbands
for i := 1023; i > 63; i-- { // Shift up the V vector
f.v_vec[ch][i] = f.v_vec[ch][i-64]
}
for i := 0; i < 32; i++ { // Copy next 32 time samples to a temp vector
s_vec[i] = f.mainData.is[gr][ch][i*18+ss]
}
for i := 0; i < 64; i++ { // Matrix multiply input with n_win[][] matrix
sum := float32(0)
for j := 0; j < 32; j++ {
sum += synthNWin[i][j] * s_vec[j]
}
f.v_vec[ch][i] = sum
}
for i := 0; i < 8; i++ { // Build the U vector
for j := 0; j < 32; j++ { // <<7 == *128
u_vec[(i<<6)+j] = f.v_vec[ch][(i<<7)+j]
u_vec[(i<<6)+j+32] = f.v_vec[ch][(i<<7)+j+96]
}
}
for i := 0; i < 512; i++ { // Window by u_vec[i] with synthDtbl[i]
u_vec[i] *= synthDtbl[i]
}
for i := 0; i < 32; i++ { // Calc 32 samples,store in outdata vector
sum := float32(0)
for j := 0; j < 16; j++ { // sum += u_vec[j*32 + i];
sum += u_vec[(j<<5)+i]
}
// sum now contains time sample 32*ss+i. Convert to 16-bit signed int
samp := int(sum * 32767)
if samp > 32767 {
samp = 32767
} else if samp < -32767 {
samp = -32767
}
samp &= 0xffff
s := uint32(samp)
if nch == 1 {
// We always run in stereo mode and duplicate channels here for mono.
out[4*(32*ss+i)] = uint8(s)
out[4*(32*ss+i)+1] = uint8(s >> 8)
out[4*(32*ss+i)+2] = uint8(s)
out[4*(32*ss+i)+3] = uint8(s >> 8)
continue
}
if ch == 0 {
out[4*(32*ss+i)] = uint8(s)
out[4*(32*ss+i)+1] = uint8(s >> 8)
} else {
out[4*(32*ss+i)+2] = uint8(s)
out[4*(32*ss+i)+3] = uint8(s >> 8)
}
}
}
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"fmt"
"io"
)
var mpeg1ScalefacSizes = [16][2]int{
{0, 0}, {0, 1}, {0, 2}, {0, 3}, {3, 0}, {1, 1}, {1, 2}, {1, 3},
{2, 1}, {2, 2}, {2, 3}, {3, 1}, {3, 2}, {3, 3}, {4, 2}, {4, 3},
}
func (s *source) readMainL3(prev *mainDataBytes, header *mpeg1FrameHeader, sideInfo *mpeg1SideInfo) (*mpeg1MainData, *mainDataBytes, error) {
nch := header.numberOfChannels()
// Calculate header audio data size
framesize := header.frameSize()
if framesize > 2000 {
return nil, nil, fmt.Errorf("mp3: framesize = %d", framesize)
}
// Sideinfo is 17 bytes for one channel and 32 bytes for two
sideinfo_size := 32
if nch == 1 {
sideinfo_size = 17
}
// Main data size is the rest of the frame,including ancillary data
main_data_size := framesize - sideinfo_size - 4 // sync+header
// CRC is 2 bytes
if header.protection_bit == 0 {
main_data_size -= 2
}
// Assemble main data buffer with data from this frame and the previous
// two frames. main_data_begin indicates how many bytes from previous
// frames that should be used. This buffer is later accessed by the
// getMainBits function in the same way as the side info is.
m, err := s.getMainData(prev, main_data_size, sideInfo.main_data_begin)
if err != nil {
// This could be due to not enough data in reservoir
return nil, nil, err
}
md := &mpeg1MainData{}
for gr := 0; gr < 2; gr++ {
for ch := 0; ch < nch; ch++ {
part_2_start := m.getMainPos()
// Number of bits in the bitstream for the bands
slen1 := mpeg1ScalefacSizes[sideInfo.scalefac_compress[gr][ch]][0]
slen2 := mpeg1ScalefacSizes[sideInfo.scalefac_compress[gr][ch]][1]
if (sideInfo.win_switch_flag[gr][ch] != 0) && (sideInfo.block_type[gr][ch] == 2) {
if sideInfo.mixed_block_flag[gr][ch] != 0 {
for sfb := 0; sfb < 8; sfb++ {
md.scalefac_l[gr][ch][sfb] = m.getMainBits(slen1)
}
for sfb := 3; sfb < 12; sfb++ {
//slen1 for band 3-5,slen2 for 6-11
nbits := slen2
if sfb < 6 {
nbits = slen1
}
for win := 0; win < 3; win++ {
md.scalefac_s[gr][ch][sfb][win] = m.getMainBits(nbits)
}
}
} else {
for sfb := 0; sfb < 12; sfb++ {
//slen1 for band 3-5,slen2 for 6-11
nbits := slen2
if sfb < 6 {
nbits = slen1
}
for win := 0; win < 3; win++ {
md.scalefac_s[gr][ch][sfb][win] = m.getMainBits(nbits)
}
}
}
} else { // block_type == 0 if winswitch == 0
// Scale factor bands 0-5
if (sideInfo.scfsi[ch][0] == 0) || (gr == 0) {
for sfb := 0; sfb < 6; sfb++ {
md.scalefac_l[gr][ch][sfb] = m.getMainBits(slen1)
}
} else if (sideInfo.scfsi[ch][0] == 1) && (gr == 1) {
// Copy scalefactors from granule 0 to granule 1
for sfb := 0; sfb < 6; sfb++ {
md.scalefac_l[1][ch][sfb] = md.scalefac_l[0][ch][sfb]
}
}
// Scale factor bands 6-10
if (sideInfo.scfsi[ch][1] == 0) || (gr == 0) {
for sfb := 6; sfb < 11; sfb++ {
md.scalefac_l[gr][ch][sfb] = m.getMainBits(slen1)
}
} else if (sideInfo.scfsi[ch][1] == 1) && (gr == 1) {
// Copy scalefactors from granule 0 to granule 1
for sfb := 6; sfb < 11; sfb++ {
md.scalefac_l[1][ch][sfb] = md.scalefac_l[0][ch][sfb]
}
}
// Scale factor bands 11-15
if (sideInfo.scfsi[ch][2] == 0) || (gr == 0) {
for sfb := 11; sfb < 16; sfb++ {
md.scalefac_l[gr][ch][sfb] = m.getMainBits(slen2)
}
} else if (sideInfo.scfsi[ch][2] == 1) && (gr == 1) {
// Copy scalefactors from granule 0 to granule 1
for sfb := 11; sfb < 16; sfb++ {
md.scalefac_l[1][ch][sfb] = md.scalefac_l[0][ch][sfb]
}
}
// Scale factor bands 16-20
if (sideInfo.scfsi[ch][3] == 0) || (gr == 0) {
for sfb := 16; sfb < 21; sfb++ {
md.scalefac_l[gr][ch][sfb] = m.getMainBits(slen2)
}
} else if (sideInfo.scfsi[ch][3] == 1) && (gr == 1) {
// Copy scalefactors from granule 0 to granule 1
for sfb := 16; sfb < 21; sfb++ {
md.scalefac_l[1][ch][sfb] = md.scalefac_l[0][ch][sfb]
}
}
}
// Read Huffman coded data. Skip stuffing bits.
if err := m.readHuffman(header, sideInfo, md, part_2_start, gr, ch); err != nil {
return nil, nil, err
}
}
}
// The ancillary data is stored here,but we ignore it.
return md, m, nil
}
type mainDataBytes struct {
// Large static data
vec []int
// Index into the current byte(0-7)
idx int
pos int
}
func (s *source) getMainData(prev *mainDataBytes, size int, offset int) (*mainDataBytes, error) {
if size > 1500 {
return nil, fmt.Errorf("mp3: size = %d", size)
}
// Check that there's data available from previous frames if needed
if prev != nil && offset > len(prev.vec) {
// No,there is not, so we skip decoding this frame, but we have to
// read the main_data bits from the bitstream in case they are needed
// for decoding the next frame.
buf := make([]int, size)
n := 0
var err error
for n < size && err == nil {
nn, err2 := s.getBytes(buf)
n += nn
err = err2
}
if n < size {
if err == io.EOF {
return nil, fmt.Errorf("mp3: unexpected EOF at getMainData")
}
return nil, err
}
m := &mainDataBytes{
vec: append(prev.vec, buf...),
}
// TODO: Define a special error and enable to continue the next frame.
return m, fmt.Errorf("mp3: frame can't be decoded")
}
// Copy data from previous frames
vec := []int{}
if prev != nil {
v := prev.vec
vec = v[len(v)-offset:]
}
// Read the main_data from file
buf := make([]int, size)
n := 0
var err error
for n < size && err == nil {
nn, err2 := s.getBytes(buf)
n += nn
err = err2
}
if n < size {
if err == io.EOF {
return nil, fmt.Errorf("mp3: unexpected EOF at getMainData")
}
return nil, err
}
m := &mainDataBytes{
vec: append(vec, buf...),
}
return m, nil
}
func (m *mainDataBytes) getMainBit() int {
tmp := uint(m.vec[m.pos]) >> (7 - uint(m.idx))
tmp &= 0x01
m.pos += (m.idx + 1) >> 3
m.idx = (m.idx + 1) & 0x07
return int(tmp)
}
func (m *mainDataBytes) getMainBits(num int) int {
if num == 0 {
return 0
}
// Form a word of the next four bytes
b := make([]int, 4)
copy(b, m.vec[m.pos:])
tmp := (uint32(b[0]) << 24) | (uint32(b[1]) << 16) | (uint32(b[2]) << 8) | (uint32(b[3]) << 0)
// Remove bits already used
tmp = tmp << uint(m.idx)
// Remove bits after the desired bits
tmp = tmp >> (32 - uint(num))
// Update pointers
m.pos += (m.idx + num) >> 3
m.idx = (m.idx + num) & 0x07
return int(tmp)
}
func (m *mainDataBytes) getMainPos() int {
pos := m.pos
pos *= 8 // Multiply by 8 to get number of bits
pos += m.idx
return pos
}
func (m *mainDataBytes) setMainPos(bit_pos int) {
m.pos = bit_pos >> 3
m.idx = bit_pos & 0x7
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"fmt"
"io"
)
func (s *source) readCRC() error {
buf := make([]int, 2)
n := 0
var err error
for n < 2 && err == nil {
nn, err2 := s.getBytes(buf[n:])
n += nn
err = err2
}
if err == io.EOF {
if n < 2 {
return fmt.Errorf("mp3: unexpected EOF at readCRC")
}
return nil
}
if err != nil {
return err
}
return nil
}
func (s *source) readNextFrame(prev *frame) (*frame, error) {
h, err := s.readHeader()
if err != nil {
return nil, err
}
// Get CRC word if present
if h.protection_bit == 0 {
if err := s.readCRC(); err != nil {
return nil, err
}
}
if h.layer != mpeg1Layer3 {
return nil, fmt.Errorf("mp3: only layer3 (want %d; got %d) is supported!", mpeg1Layer3, h.layer)
}
// Get side info
si, err := s.readSideInfo(h)
if err != nil {
return nil, err
}
// If there's not enough main data in the bit reservoir,
// signal to calling function so that decoding isn't done!
// Get main data(scalefactors and Huffman coded frequency data)
var prevM *mainDataBytes
if prev != nil {
prevM = prev.mainDataBytes
}
md, mdb, err := s.readMainL3(prevM, h, si)
if err != nil {
return nil, err
}
nf := &frame{
prev: prev,
header: h,
sideInfo: si,
mainData: md,
mainDataBytes: mdb,
}
if nf.prev != nil {
nf.store = nf.prev.store
nf.v_vec = nf.prev.v_vec
}
return nf, nil
}
func isHeader(header uint32) bool {
const C_SYNC = 0xffe00000
if (header & C_SYNC) != C_SYNC {
return false
}
// Bitrate must not be 15.
if (header & (0xf << 12)) == 0xf<<12 {
return false
}
// Sample Frequency must not be 3.
if (header & (3 << 10)) == 3<<10 {
return false
}
return true
}
func (s *source) readHeader() (*mpeg1FrameHeader, error) {
// Get the next four bytes from the bitstream
buf := make([]int, 4)
n := 0
var err error
for n < 4 && err == nil {
nn, err2 := s.getBytes(buf[n:])
n += nn
err = err2
}
if n < 4 {
if err == io.EOF {
if n == 0 {
// Expected EOF
return nil, io.EOF
}
return nil, fmt.Errorf("mp3: unexpected EOF at readHeader")
}
return nil, err
}
b1 := uint32(buf[0])
b2 := uint32(buf[1])
b3 := uint32(buf[2])
b4 := uint32(buf[3])
header := (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4 << 0)
for !isHeader(uint32(header)) {
// No,so scan the bitstream one byte at a time until we find it or EOF
// Shift the values one byte to the left
b1 = b2
b2 = b3
b3 = b4
// Get one new byte from the bitstream
b, err := s.getByte()
if err != nil {
if err == io.EOF {
return nil, fmt.Errorf("mp3: unexpected EOF at readHeader")
}
return nil, err
}
b4 = uint32(b)
header = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4 << 0)
}
// If we get here we've found the sync word,and can decode the header
// which is in the low 20 bits of the 32-bit sync+header word.
// Decode the header
h := &mpeg1FrameHeader{}
h.id = int((header & 0x00180000) >> 19)
h.layer = mpeg1Layer((header & 0x00060000) >> 17)
h.protection_bit = int((header & 0x00010000) >> 16)
h.bitrate_index = int((header & 0x0000f000) >> 12)
h.sampling_frequency = int((header & 0x00000c00) >> 10)
h.padding_bit = int((header & 0x00000200) >> 9)
h.private_bit = int((header & 0x00000100) >> 8)
h.mode = mpeg1Mode((header & 0x000000c0) >> 6)
h.mode_extension = int((header & 0x00000030) >> 4)
h.copyright = int((header & 0x00000008) >> 3)
h.original_or_copy = int((header & 0x00000004) >> 2)
h.emphasis = int((header & 0x00000003) >> 0)
// Check for invalid values and impossible combinations
if h.id != 3 {
return nil, fmt.Errorf("mp3: ID must be 3. Header word is 0x%08x at file pos %d",
header, s.getFilepos())
}
if h.bitrate_index == 0 {
return nil, fmt.Errorf("mp3: Free bitrate format NIY! Header word is 0x%08x at file pos %d",
header, s.getFilepos())
}
if h.bitrate_index == 15 {
return nil, fmt.Errorf("mp3: bitrate_index = 15 is invalid! Header word is 0x%08x at file pos %d",
header, s.getFilepos())
}
if h.sampling_frequency == 3 {
return nil, fmt.Errorf("mp3: sampling_frequency = 3 is invalid! Header word is 0x%08x at file pos %d",
header, s.getFilepos())
}
if h.layer == mpeg1LayerReserved {
return nil, fmt.Errorf("mp3: layer = %d is invalid! Header word is 0x%08x at file pos %d",
mpeg1LayerReserved, header, s.getFilepos())
}
return h, nil
}
func (m *mainDataBytes) readHuffman(header *mpeg1FrameHeader, sideInfo *mpeg1SideInfo, mainData *mpeg1MainData, part_2_start, gr, ch int) error {
// Check that there is any data to decode. If not,zero the array.
if sideInfo.part2_3_length[gr][ch] == 0 {
for is_pos := 0; is_pos < 576; is_pos++ {
mainData.is[gr][ch][is_pos] = 0.0
}
return nil
}
// Calculate bit_pos_end which is the index of the last bit for this part.
bit_pos_end := part_2_start + sideInfo.part2_3_length[gr][ch] - 1
// Determine region boundaries
region_1_start := 0
region_2_start := 0
if (sideInfo.win_switch_flag[gr][ch] == 1) && (sideInfo.block_type[gr][ch] == 2) {
region_1_start = 36 // sfb[9/3]*3=36
region_2_start = 576 // No Region2 for short block case.
} else {
sfreq := header.sampling_frequency
region_1_start =
sfBandIndicesSet[sfreq].l[sideInfo.region0_count[gr][ch]+1]
region_2_start =
sfBandIndicesSet[sfreq].l[sideInfo.region0_count[gr][ch]+
sideInfo.region1_count[gr][ch]+2]
}
// Read big_values using tables according to region_x_start
for is_pos := 0; is_pos < sideInfo.big_values[gr][ch]*2; is_pos++ {
table_num := 0
if is_pos < region_1_start {
table_num = sideInfo.table_select[gr][ch][0]
} else if is_pos < region_2_start {
table_num = sideInfo.table_select[gr][ch][1]
} else {
table_num = sideInfo.table_select[gr][ch][2]
}
// Get next Huffman coded words
x, y, _, _, err := huffmanDecode(m, table_num)
if err != nil {
return err
}
// In the big_values area there are two freq lines per Huffman word
mainData.is[gr][ch][is_pos] = float32(x)
is_pos++
mainData.is[gr][ch][is_pos] = float32(y)
}
// Read small values until is_pos = 576 or we run out of huffman data
table_num := sideInfo.count1table_select[gr][ch] + 32
is_pos := sideInfo.big_values[gr][ch] * 2
for (is_pos <= 572) && (m.getMainPos() <= bit_pos_end) {
// Get next Huffman coded words
x, y, v, w, err := huffmanDecode(m, table_num)
if err != nil {
return err
}
mainData.is[gr][ch][is_pos] = float32(v)
is_pos++
if is_pos >= 576 {
break
}
mainData.is[gr][ch][is_pos] = float32(w)
is_pos++
if is_pos >= 576 {
break
}
mainData.is[gr][ch][is_pos] = float32(x)
is_pos++
if is_pos >= 576 {
break
}
mainData.is[gr][ch][is_pos] = float32(y)
is_pos++
}
// Check that we didn't read past the end of this section
if m.getMainPos() > (bit_pos_end + 1) {
// Remove last words read
is_pos -= 4
}
// Setup count1 which is the index of the first sample in the rzero reg.
sideInfo.count1[gr][ch] = is_pos
// Zero out the last part if necessary
for is_pos < 576 {
mainData.is[gr][ch][is_pos] = 0.0
is_pos++
}
// Set the bitpos to point to the next part to read
m.setMainPos(bit_pos_end + 1)
return nil
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
package mp3
import (
"fmt"
"io"
)
func (src *source) readSideInfo(header *mpeg1FrameHeader) (*mpeg1SideInfo, error) {
nch := header.numberOfChannels()
// Calculate header audio data size
framesize := header.frameSize()
if framesize > 2000 {
return nil, fmt.Errorf("mp3: framesize = %d\n", framesize)
}
// Sideinfo is 17 bytes for one channel and 32 bytes for two
sideinfo_size := 32
if nch == 1 {
sideinfo_size = 17
}
// Main data size is the rest of the frame,including ancillary data
main_data_size := framesize - sideinfo_size - 4 // sync+header
// CRC is 2 bytes
if header.protection_bit == 0 {
main_data_size -= 2
}
// Read sideinfo from bitstream into buffer used by getSideBits()
s, err := src.getSideinfo(sideinfo_size)
if err != nil {
return nil, err
}
// Parse audio data
// Pointer to where we should start reading main data
si := &mpeg1SideInfo{}
si.main_data_begin = s.getSideBits(9)
// Get private bits. Not used for anything.
if header.mode == mpeg1ModeSingleChannel {
si.private_bits = s.getSideBits(5)
} else {
si.private_bits = s.getSideBits(3)
}
// Get scale factor selection information
for ch := 0; ch < nch; ch++ {
for scfsi_band := 0; scfsi_band < 4; scfsi_band++ {
si.scfsi[ch][scfsi_band] = s.getSideBits(1)
}
}
// Get the rest of the side information
for gr := 0; gr < 2; gr++ {
for ch := 0; ch < nch; ch++ {
si.part2_3_length[gr][ch] = s.getSideBits(12)
si.big_values[gr][ch] = s.getSideBits(9)
si.global_gain[gr][ch] = s.getSideBits(8)
si.scalefac_compress[gr][ch] = s.getSideBits(4)
si.win_switch_flag[gr][ch] = s.getSideBits(1)
if si.win_switch_flag[gr][ch] == 1 {
si.block_type[gr][ch] = s.getSideBits(2)
si.mixed_block_flag[gr][ch] = s.getSideBits(1)
for region := 0; region < 2; region++ {
si.table_select[gr][ch][region] = s.getSideBits(5)
}
for window := 0; window < 3; window++ {
si.subblock_gain[gr][ch][window] = s.getSideBits(3)
}
if (si.block_type[gr][ch] == 2) && (si.mixed_block_flag[gr][ch] == 0) {
si.region0_count[gr][ch] = 8 // Implicit
} else {
si.region0_count[gr][ch] = 7 // Implicit
}
// The standard is wrong on this!!!
// Implicit
si.region1_count[gr][ch] = 20 - si.region0_count[gr][ch]
} else {
for region := 0; region < 3; region++ {
si.table_select[gr][ch][region] = s.getSideBits(5)
}
si.region0_count[gr][ch] = s.getSideBits(4)
si.region1_count[gr][ch] = s.getSideBits(3)
si.block_type[gr][ch] = 0 // Implicit
}
si.preflag[gr][ch] = s.getSideBits(1)
si.scalefac_scale[gr][ch] = s.getSideBits(1)
si.count1table_select[gr][ch] = s.getSideBits(1)
}
}
return si, nil
}
// A sideInfoBytes is a bit reservoir for side info
type sideInfoBytes struct {
vec []int
idx int // Index into the current byte(0-7)
}
func (src *source) getSideinfo(size int) (*sideInfoBytes, error) {
buf := make([]int, size)
n := 0
var err error
for n < size && err == nil {
nn, err2 := src.getBytes(buf[n:])
n += nn
err = err2
}
if n < size {
if err == io.EOF {
return nil, fmt.Errorf("mp3: unexpected EOF at getSideinfo")
}
return nil, fmt.Errorf("mp3: couldn't read sideinfo %d bytes at pos %d: %v",
size, src.getFilepos(), err)
}
s := &sideInfoBytes{
vec: buf[:n],
}
return s, nil
}
func (s *sideInfoBytes) getSideBits(num int) int {
// Form a word of the next four bytes
// TODO: endianness?
b := make([]int, 4)
for i := range b {
if len(s.vec) > i {
b[i] = s.vec[i]
}
}
tmp := (uint32(b[0]) << 24) | (uint32(b[1]) << 16) | (uint32(b[2]) << 8) | (uint32(b[3]) << 0)
// Remove bits already used
tmp = tmp << uint(s.idx)
// Remove bits after the desired bits
tmp = tmp >> (32 - uint(num))
// Update pointers
s.vec = s.vec[(s.idx+int(num))>>3:]
s.idx = (s.idx + int(num)) & 0x07
return int(tmp)
}

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// Copyright 2017 Hajime Hoshi
//
// 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.
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
}
// 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.!
}
// 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
}
type frame struct {
prev *frame
header *mpeg1FrameHeader
sideInfo *mpeg1SideInfo
mainData *mpeg1MainData
mainDataBytes *mainDataBytes
store [2][32][18]float32
v_vec [2][1024]float32
}
var mpeg1Bitrates = map[mpeg1Layer][15]int{
mpeg1Layer1: {
0, 32000, 64000, 96000, 128000, 160000, 192000, 224000,
256000, 288000, 320000, 352000, 384000, 416000, 448000,
},
mpeg1Layer2: {
0, 32000, 48000, 56000, 64000, 80000, 96000, 112000,
128000, 160000, 192000, 224000, 256000, 320000, 384000,
},
mpeg1Layer3: {
0, 32000, 40000, 48000, 56000, 64000, 80000, 96000,
112000, 128000, 160000, 192000, 224000, 256000, 320000,
},
}
var samplingFrequency = []int{44100, 48000, 32000}
func (h *mpeg1FrameHeader) frameSize() int {
return (144*mpeg1Bitrates[h.layer][h.bitrate_index])/
samplingFrequency[h.sampling_frequency] +
int(h.padding_bit)
}
func (h *mpeg1FrameHeader) numberOfChannels() int {
if h.mode == mpeg1ModeSingleChannel {
return 1
}
return 2
}