mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-13 22:47:26 +01:00
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
// Copyright 2024 The Ebitengine Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package convert
|
|
|
|
import (
|
|
"io"
|
|
)
|
|
|
|
type StereoF32 struct {
|
|
source io.ReadSeeker
|
|
mono bool
|
|
buf []byte
|
|
}
|
|
|
|
func NewStereoF32(source io.ReadSeeker, mono bool) *StereoF32 {
|
|
return &StereoF32{
|
|
source: source,
|
|
mono: mono,
|
|
}
|
|
}
|
|
|
|
func (s *StereoF32) Read(b []byte) (int, error) {
|
|
l := len(b) / 8 * 8
|
|
if s.mono {
|
|
l /= 2
|
|
}
|
|
|
|
if cap(s.buf) < l {
|
|
s.buf = make([]byte, l)
|
|
}
|
|
|
|
n, err := s.source.Read(s.buf[:l])
|
|
if err != nil && err != io.EOF {
|
|
return 0, err
|
|
}
|
|
if s.mono {
|
|
for i := 0; i < n/4; i++ {
|
|
b[8*i] = s.buf[4*i]
|
|
b[8*i+1] = s.buf[4*i+1]
|
|
b[8*i+2] = s.buf[4*i+2]
|
|
b[8*i+3] = s.buf[4*i+3]
|
|
b[8*i+4] = s.buf[4*i]
|
|
b[8*i+5] = s.buf[4*i+1]
|
|
b[8*i+6] = s.buf[4*i+2]
|
|
b[8*i+7] = s.buf[4*i+3]
|
|
}
|
|
n *= 2
|
|
} else {
|
|
copy(b[:n], s.buf[:n])
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (s *StereoF32) Seek(offset int64, whence int) (int64, error) {
|
|
offset = offset / 8 * 8
|
|
if s.mono {
|
|
offset /= 2
|
|
}
|
|
return s.source.Seek(offset, whence)
|
|
}
|