mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
f0ef1ecad0
This change adds these APIs * (*audio.Context).NewPlayerF32 * (*audio.Context).NewPlayerF32FromBytes * audio.NewInfiniteLoopF32 * audio.NewInfiniteLoopWithIntroF32 * audio.ResampleF32 * mp3.DecodeF32 * vorbis.DecodeF32 * wav.DecodeF32 Closes #2160
81 lines
1.8 KiB
Go
81 lines
1.8 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 vorbis
|
|
|
|
import (
|
|
"io"
|
|
"math"
|
|
|
|
"github.com/jfreymuth/oggvorbis"
|
|
)
|
|
|
|
var _ io.ReadSeeker = (*float32BytesReadSeeker)(nil)
|
|
|
|
func newFloat32BytesReadSeeker(r *oggvorbis.Reader) *float32BytesReadSeeker {
|
|
return &float32BytesReadSeeker{r: r}
|
|
}
|
|
|
|
type float32BytesReadSeeker struct {
|
|
r *oggvorbis.Reader
|
|
fbuf []float32
|
|
pos int64
|
|
}
|
|
|
|
func (r *float32BytesReadSeeker) Read(buf []byte) (int, error) {
|
|
if len(buf) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
l := max(len(buf)/4/r.r.Channels()*r.r.Channels(), 1)
|
|
if cap(r.fbuf) < l {
|
|
r.fbuf = make([]float32, l)
|
|
}
|
|
|
|
n, err := r.r.Read(r.fbuf[:l])
|
|
if err != nil && err != io.EOF {
|
|
return 0, err
|
|
}
|
|
|
|
for i := 0; i < n; i++ {
|
|
v := math.Float32bits(r.fbuf[i])
|
|
buf[4*i] = byte(v)
|
|
buf[4*i+1] = byte(v >> 8)
|
|
buf[4*i+2] = byte(v >> 16)
|
|
buf[4*i+3] = byte(v >> 24)
|
|
}
|
|
|
|
r.pos += int64(n * 4)
|
|
|
|
return n * 4, err
|
|
}
|
|
|
|
func (r *float32BytesReadSeeker) Seek(offset int64, whence int) (int64, error) {
|
|
sampleSize := int64(r.r.Channels()) * 4
|
|
offset = offset / sampleSize * sampleSize
|
|
|
|
switch whence {
|
|
case io.SeekStart:
|
|
case io.SeekCurrent:
|
|
offset += r.pos
|
|
case io.SeekEnd:
|
|
offset += r.r.Length()
|
|
}
|
|
r.pos = offset
|
|
if err := r.r.SetPosition(r.pos / sampleSize); err != nil {
|
|
return 0, err
|
|
}
|
|
return r.pos, nil
|
|
}
|