mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
// Copyright 2017 The Ebiten 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"
|
|
|
|
"github.com/hajimehoshi/ebiten/audio"
|
|
)
|
|
|
|
type Stereo16 struct {
|
|
source audio.ReadSeekCloser
|
|
mono bool
|
|
eight bool
|
|
}
|
|
|
|
func NewStereo16(source audio.ReadSeekCloser, mono, eight bool) *Stereo16 {
|
|
return &Stereo16{
|
|
source: source,
|
|
mono: mono,
|
|
eight: eight,
|
|
}
|
|
}
|
|
|
|
func (s *Stereo16) Read(b []uint8) (int, error) {
|
|
l := len(b)
|
|
if s.mono {
|
|
l /= 2
|
|
}
|
|
if s.eight {
|
|
l /= 2
|
|
}
|
|
buf := make([]uint8, l)
|
|
n, err := s.source.Read(buf)
|
|
if err != nil && err != io.EOF {
|
|
return 0, err
|
|
}
|
|
switch {
|
|
case s.mono && s.eight:
|
|
for i := 0; i < n; i++ {
|
|
v := int16(int(buf[i])*0x101 - (1 << 15))
|
|
b[4*i] = uint8(v)
|
|
b[4*i+1] = uint8(v >> 8)
|
|
b[4*i+2] = uint8(v)
|
|
b[4*i+3] = uint8(v >> 8)
|
|
}
|
|
case s.mono && !s.eight:
|
|
for i := 0; i < n/2; i++ {
|
|
b[4*i] = buf[2*i]
|
|
b[4*i+1] = buf[2*i+1]
|
|
b[4*i+2] = buf[2*i]
|
|
b[4*i+3] = buf[2*i+1]
|
|
}
|
|
case !s.mono && s.eight:
|
|
for i := 0; i < n/2; i++ {
|
|
v0 := int16(int(buf[2*i])*0x101 - (1 << 15))
|
|
v1 := int16(int(buf[2*i+1])*0x101 - (1 << 15))
|
|
b[4*i] = uint8(v0)
|
|
b[4*i+1] = uint8(v0 >> 8)
|
|
b[4*i+2] = uint8(v1)
|
|
b[4*i+3] = uint8(v1 >> 8)
|
|
}
|
|
}
|
|
if s.mono {
|
|
n *= 2
|
|
}
|
|
if s.eight {
|
|
n *= 2
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (s *Stereo16) Seek(offset int64, whence int) (int64, error) {
|
|
if s.mono {
|
|
offset /= 2
|
|
}
|
|
if s.eight {
|
|
offset /= 2
|
|
}
|
|
return s.source.Seek(offset, whence)
|
|
}
|
|
|
|
func (s *Stereo16) Close() error {
|
|
return s.source.Close()
|
|
}
|