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audio/vorbis: Avoid appending buffer

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This commit is contained in:
Hajime Hoshi 2016-12-08 02:14:34 +09:00
parent 20ae2e0fc8
commit 8ed07e0822
1 changed files with 14 additions and 6 deletions
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20
audio/vorbis/vorbis.go
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@ -26,6 +26,7 @@ import (
type decoded struct {
data []float32
totalBytes int
readBytes int
posInBytes int
source io.Closer
decoder *oggvorbis.Reader
@ -34,10 +35,18 @@ type decoded struct {
func (d *decoded) readUntil(posInBytes int) error {
c := 0
buffer := make([]float32, 8192)
for len(d.data) < posInBytes/2 {
for d.readBytes < posInBytes {
n, err := d.decoder.Read(buffer)
if n > 0 {
d.data = append(d.data, buffer[:n]...)
// Actual read bytes might exceed the total bytes.
if d.readBytes+n*2 > d.totalBytes {
n = (d.totalBytes - d.readBytes) / 2
}
p := d.readBytes / 2
for i := 0; i < n; i++ {
d.data[p+i] = buffer[i]
}
d.readBytes += n * 2
}
if err == io.EOF {
if err := d.source.Close(); err != nil {
@ -57,8 +66,7 @@ func (d *decoded) readUntil(posInBytes int) error {
}
func (d *decoded) Read(b []uint8) (int, error) {
total := d.totalBytes
l := total - d.posInBytes
l := d.totalBytes - d.posInBytes
if l > len(b) {
l = len(b)
}
@ -77,7 +85,7 @@ func (d *decoded) Read(b []uint8) (int, error) {
b[2*i+1] = uint8(s >> 8)
}
d.posInBytes += l
if d.posInBytes == total {
if d.posInBytes == d.totalBytes {
return l, io.EOF
}
return l, nil
@ -119,7 +127,7 @@ func decode(in audio.ReadSeekCloser) (*decoded, int, int, error) {
return nil, 0, 0, err
}
d := &decoded{
data: make([]float32, 0, r.Length()),
data: make([]float32, r.Length()*2),
totalBytes: int(r.Length()) * 4, // TODO: What if length is 0?
posInBytes: 0,
source: in,