ebiten/audio/loop_test.go

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// Copyright 2018 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 audio_test
import (
"bytes"
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"io"
"math"
"testing"
"github.com/hajimehoshi/ebiten/v2/audio"
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)
func TestInfiniteLoop(t *testing.T) {
indexToByte := func(index int) byte {
return byte(math.Sin(float64(index)) * 256)
}
src := make([]byte, 256)
for i := range src {
src[i] = indexToByte(i)
}
l := audio.NewInfiniteLoop(bytes.NewReader(src), int64(len(src)))
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buf := make([]byte, len(src)*4)
if _, err := io.ReadFull(l, buf); err != nil {
t.Error(err)
}
for i, b := range buf {
got := b
want := indexToByte(i % len(src))
if got != want {
t.Errorf("index: %d, got: %v, want: %v", i, got, want)
}
}
n, err := l.Seek(int64(len(src))*5+128, io.SeekStart)
if err != nil {
t.Error(err)
}
if want := int64(128); n != want {
t.Errorf("got: %v, want: %v", n, want)
}
n2, err := l.Seek(int64(len(src))*6+64, io.SeekCurrent)
if err != nil {
t.Error(err)
}
if want := int64(192); n2 != want {
t.Errorf("got: %v, want: %v", n, want)
}
buf2 := make([]byte, len(src)*7)
if _, err := io.ReadFull(l, buf2); err != nil {
t.Error(err)
}
for i, b := range buf2 {
got := b
want := indexToByte((i + 192) % len(src))
if got != want {
t.Errorf("index: %d, got: %v, want: %v", i, got, want)
}
}
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// Seek to negative position is an error.
if _, err := l.Seek(-1, io.SeekStart); err == nil {
t.Errorf("got: %v, want: %v", err, nil)
}
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}
func TestInfiniteLoopWithIntro(t *testing.T) {
const (
srcLength = 17 * 4
introLength = 19 * 4
loopLength = 23 * 4
)
indexToByte := func(index int) byte {
return byte(math.Sin(float64(index)) * 256)
}
src := make([]byte, srcLength)
for i := range src {
src[i] = indexToByte(i)
}
srcInf := audio.NewInfiniteLoop(bytes.NewReader(src), srcLength)
srcInf.SetNoBlendForTesting(true)
l := audio.NewInfiniteLoopWithIntro(srcInf, introLength, loopLength)
l.SetNoBlendForTesting(true)
buf := make([]byte, srcLength*4)
if _, err := io.ReadFull(l, buf); err != nil {
t.Error(err)
}
for i, b := range buf {
got := b
want := byte(0)
if i < introLength {
want = indexToByte(i % srcLength)
} else {
want = indexToByte(((i-introLength)%loopLength + introLength) % srcLength)
}
if got != want {
t.Errorf("index: %d, got: %v, want: %v", i, got, want)
}
}
n, err := l.Seek(srcLength*5+128, io.SeekStart)
if err != nil {
t.Error(err)
}
if want := int64((srcLength*5+128-introLength)%loopLength + introLength); n != want {
t.Errorf("got: %v, want: %v", n, want)
}
n2, err := l.Seek(srcLength*6+64, io.SeekCurrent)
if err != nil {
t.Error(err)
}
if want := int64(((srcLength*11+192)-introLength)%loopLength + introLength); n2 != want {
t.Errorf("got: %v, want: %v", n, want)
}
buf2 := make([]byte, srcLength*7)
if _, err := io.ReadFull(l, buf2); err != nil {
t.Error(err)
}
for i, b := range buf2 {
got := b
idx := ((int(n2+int64(i))-introLength)%loopLength + introLength) % srcLength
want := indexToByte(idx)
if got != want {
t.Errorf("index: %d, got: %v, want: %v", i, got, want)
}
}
// Seek to negative position is an error.
if _, err := l.Seek(-1, io.SeekStart); err == nil {
t.Errorf("got: %v, want: %v", err, nil)
}
}
func TestInfiniteLoopWithIncompleteSize(t *testing.T) {
// s1 should work as if 4092 is given.
s1 := audio.NewInfiniteLoop(bytes.NewReader(make([]byte, 4096)), 4095)
n1, err := s1.Seek(4093, io.SeekStart)
if err != nil {
t.Error(err)
}
if got, want := n1, int64(4093-4092); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
// s2 should work as if 2044 and 2044 are given.
s2 := audio.NewInfiniteLoopWithIntro(bytes.NewReader(make([]byte, 4096)), 2047, 2046)
n2, err := s2.Seek(4093, io.SeekStart)
if err != nil {
t.Error(err)
}
if got, want := n2, int64(2044+(4093-(2044+2044))); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
}
type slowReader struct {
src io.ReadSeeker
eof bool
}
func (s *slowReader) Read(buf []byte) (int, error) {
if len(buf) == 0 {
if s.eof {
return 0, io.EOF
}
return 0, nil
}
n, err := s.src.Read(buf[:1])
if err == io.EOF {
s.eof = true
}
return n, err
}
func (s *slowReader) Seek(offset int64, whence int) (int64, error) {
s.eof = false
return s.src.Seek(offset, whence)
}
func TestInfiniteLoopWithSlowSource(t *testing.T) {
src := make([]byte, 4096)
for i := range src {
src[i] = byte(i)
}
r := &slowReader{
src: bytes.NewReader(src),
}
loop := audio.NewInfiniteLoop(r, 4096)
buf := make([]byte, 4096)
// With a slow source, whose Read always reads at most one byte,
// an infinite loop should adjust the reading size along with bitDepthInBytes (= 2).
n0, err := loop.Read(buf)
if err != nil {
t.Error(err)
}
if got, want := n0, 0; got != want {
t.Errorf("got: %d, want: %d", got, want)
}
n1, err := loop.Read(buf)
if err != nil {
t.Error(err)
}
if got, want := n1, 2; got != want {
t.Errorf("got: %d, want: %d", got, want)
}
if got, want := buf[0], byte(0); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
if got, want := buf[1], byte(1); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
n2, err := loop.Read(buf)
if err != nil {
t.Error(err)
}
if got, want := n2, 0; got != want {
t.Errorf("got: %d, want: %d", got, want)
}
n3, err := loop.Read(buf)
if err != nil {
t.Error(err)
}
if got, want := n3, 2; got != want {
t.Errorf("got: %d, want: %d", got, want)
}
if got, want := buf[0], byte(2); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
if got, want := buf[1], byte(3); got != want {
t.Errorf("got: %d, want: %d", got, want)
}
}