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audio/vorbis: Use oggvorbis for browsers

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This commit is contained in:
Hajime Hoshi 2016-11-29 01:01:52 +09:00
parent b0231c040e
commit b454ff6547
3 changed files with 35 additions and 141 deletions
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2
audio/vorbis/decode.go
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@ -12,8 +12,6 @@
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !js
package vorbis
import (

127
audio/vorbis/decode_js.go
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@ -1,127 +0,0 @@
// Copyright 2016 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.
// +build js
package vorbis
import (
"errors"
"io"
"io/ioutil"
"github.com/gopherjs/gopherjs/js"
"github.com/hajimehoshi/ebiten/audio"
)
// TODO: This just uses decodeAudioData can treat audio files other than Ogg/Vorbis.
// TODO: This doesn't work on iOS which doesn't have Ogg/Vorbis decoder.
type Stream struct {
leftData []float32
rightData []float32
posInBytes int
}
func (s *Stream) Read(b []byte) (int, error) {
l := len(s.leftData)*4 - s.posInBytes
if l > len(b) {
l = len(b)
}
l = l / 4 * 4
for i := 0; i < l/4; i++ {
l := s.leftData[s.posInBytes/4+i]
r := s.rightData[s.posInBytes/4+i]
if 1 < l {
l = 1
}
if l < -1 {
l = -1
}
if 1 < r {
r = 1
}
if r < -1 {
r = -1
}
il := int16(l * ((1 << 15) - 1))
ir := int16(r * ((1 << 15) - 1))
b[4*i] = uint8(il)
b[4*i+1] = uint8(il >> 8)
b[4*i+2] = uint8(ir)
b[4*i+3] = uint8(ir >> 8)
}
s.posInBytes += l
if s.posInBytes == len(s.leftData)*4 {
return l, io.EOF
}
return l, nil
}
func (s *Stream) Seek(offset int64, whence int) (int64, error) {
next := int64(0)
switch whence {
case io.SeekStart:
next = offset
case io.SeekCurrent:
next = int64(s.posInBytes) + offset
case io.SeekEnd:
next = int64(len(s.leftData)*4) + offset
}
s.posInBytes = int(next)
return next, nil
}
func (s *Stream) Close() error {
return nil
}
func (s *Stream) Size() int64 {
return int64(len(s.leftData) * 4)
}
func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
b, err := ioutil.ReadAll(src)
if err != nil {
return nil, err
}
if err := src.Close(); err != nil {
return nil, err
}
s := &Stream{}
ch := make(chan error)
klass := js.Global.Get("OfflineAudioContext")
if klass == js.Undefined {
klass = js.Global.Get("webkitOfflineAudioContext")
}
if klass == js.Undefined {
return nil, errors.New("vorbis: OfflineAudioContext is not available")
}
// TODO: 1 is a correct second argument?
// At least, 1 works on Chrome and Firefox but not Safari.
oc := klass.New(2, 1, context.SampleRate())
oc.Call("decodeAudioData", js.NewArrayBuffer(b), func(buf *js.Object) {
s.leftData = buf.Call("getChannelData", 0).Interface().([]float32)
s.rightData = buf.Call("getChannelData", 1).Interface().([]float32)
close(ch)
}, func() {
ch <- errors.New("vorbis: decodeAudioData failed (Safari might not be able to decode Ogg/Vorbis).")
close(ch)
})
if err := <-ch; err != nil {
return nil, err
}
return s, nil
}

47
audio/vorbis/vorbis.go
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@ -12,8 +12,6 @@
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !js
// Package vorbis provides Ogg/Vorbis decoder.
package vorbis
@ -21,22 +19,46 @@ import (
"io"
"runtime"
"github.com/hajimehoshi/ebiten/audio"
"github.com/jfreymuth/oggvorbis"
)
type decoded struct {
data []float32
totalBytes int
posInBytes int
source io.Closer
decoder *oggvorbis.Reader
}
func (d *decoded) Read(b []byte) (int, error) {
total := len(d.data) * 2
total := d.totalBytes
l := total - d.posInBytes
if l > len(b) {
l = len(b)
}
if l < 0 {
return 0, io.EOF
}
// l must be even so that d.posInBytes is always even.
l = l / 2 * 2
for len(d.data) < (d.posInBytes+l)/2 {
// TODO: What if the channel is closed?
buffer := make([]float32, 4096)
n, err := d.decoder.Read(buffer)
if n > 0 {
d.data = append(d.data, buffer[:n]...)
}
if err == io.EOF {
if err := d.source.Close(); err != nil {
return 0, err
}
break
}
if err != nil {
return 0, err
}
}
for i := 0; i < l/2; i++ {
f := d.data[d.posInBytes/2+i]
s := int16(f * (1<<15 - 1))
@ -58,7 +80,7 @@ func (d *decoded) Seek(offset int64, whence int) (int64, error) {
case io.SeekCurrent:
next = int64(d.posInBytes) + offset
case io.SeekEnd:
next = int64(len(d.data)*2) + offset
next = int64(d.totalBytes) + offset
}
d.posInBytes = int(next)
return next, nil
@ -70,22 +92,23 @@ func (d *decoded) Close() error {
}
func (d *decoded) Size() int64 {
return int64(len(d.data) * 2)
return int64(d.totalBytes)
}
// decode accepts an ogg stream and returns a decorded stream.
func decode(in io.ReadCloser) (*decoded, int, int, error) {
data, format, err := oggvorbis.ReadAll(in)
func decode(in audio.ReadSeekCloser) (*decoded, int, int, error) {
// TODO: Lazy evaluation
r, err := oggvorbis.NewReader(in)
if err != nil {
return nil, 0, 0, err
}
if err := in.Close(); err != nil {
return nil, 0, 0, err
}
d := &decoded{
data: data,
data: []float32{},
totalBytes: int(r.Length()) * 4, // TODO: What if length is 0?
posInBytes: 0,
source: in,
decoder: r,
}
runtime.SetFinalizer(d, (*decoded).Close)
return d, format.Channels, format.SampleRate, nil
return d, r.Channels(), r.SampleRate(), nil
}