mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
// Copyright 2024 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package convert
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import (
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"io"
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)
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type StereoF32 struct {
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source io.ReadSeeker
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mono bool
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buf []byte
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}
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func NewStereoF32(source io.ReadSeeker, mono bool) *StereoF32 {
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return &StereoF32{
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source: source,
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mono: mono,
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}
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}
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func (s *StereoF32) Read(b []byte) (int, error) {
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l := len(b) / 8 * 8
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if s.mono {
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l /= 2
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}
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if cap(s.buf) < l {
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s.buf = make([]byte, l)
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}
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n, err := s.source.Read(s.buf[:l])
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if err != nil && err != io.EOF {
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return 0, err
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}
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if s.mono {
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for i := 0; i < n/4; i++ {
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b[8*i] = s.buf[4*i]
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b[8*i+1] = s.buf[4*i+1]
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b[8*i+2] = s.buf[4*i+2]
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b[8*i+3] = s.buf[4*i+3]
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b[8*i+4] = s.buf[4*i]
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b[8*i+5] = s.buf[4*i+1]
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b[8*i+6] = s.buf[4*i+2]
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b[8*i+7] = s.buf[4*i+3]
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}
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n *= 2
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} else {
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copy(b[:n], s.buf[:n])
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}
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return n, err
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}
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func (s *StereoF32) Seek(offset int64, whence int) (int64, error) {
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offset = offset / 8 * 8
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if s.mono {
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offset /= 2
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}
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return s.source.Seek(offset, whence)
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}
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