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package wav
import (
"io/ioutil"
"math"
"os"
"testing"
"github.com/cheekybits/is"
)
func TestWriteRead_Int32(t *testing.T) {
is := is.New(t)
const (
bits = 32
rate = 44100
)
f, err := ioutil.TempFile("", "wavPkgtest")
is.NoErr(err)
testFname := f.Name()
meta := File{
Channels: 1,
SampleRate: rate,
SignificantBits: bits,
}
writer, err := meta.NewWriter(f)
is.NoErr(err)
var freq float64
freq = 0.0001
// one second
for n := 0; n < rate; n++ {
y := int32(0.8 * math.Pow(2, bits-1) * math.Sin(freq*float64(n)))
freq += 0.000002
err = writer.WriteInt32(y)
if err != nil {
t.Fatal(err)
}
}
err = writer.Close()
is.NoErr(err)
f, err = os.Open(testFname)
is.NoErr(err)
stat, err := f.Stat()
is.NoErr(err)
_, err = NewReader(f, stat.Size())
is.NoErr(err)
is.NoErr(os.Remove(testFname))
}
func TestWriteRead_Sample(t *testing.T) {
is := is.New(t)
const (
bits = 16
rate = 44100
)
f, err := ioutil.TempFile("", "wavPkgtest")
is.NoErr(err)
testFname := f.Name()
meta := File{
Channels: 1,
SampleRate: rate,
SignificantBits: bits,
}
writer, err := meta.NewWriter(f)
is.NoErr(err)
var freq float64
freq = 0.0001
var s = make([]byte, 2)
// one second
for n := 0; n < rate; n++ {
y := int32(0.8 * math.Pow(2, bits-1) * math.Sin(freq*float64(n)))
freq += 0.000002
// s[3] = byte((y >> 24) & 0xFF)
// s[2] = byte((y >> 16) & 0xFF)
s[1] = byte((y >> 8) & 0xFF)
s[0] = byte(y & 0xFF)
err = writer.WriteSample(s)
if err != nil {
t.Fatal(err)
}
}
err = writer.Close()
is.NoErr(err)
f, err = os.Open(testFname)
is.NoErr(err)
stat, err := f.Stat()
is.NoErr(err)
_, err = NewReader(f, stat.Size())
is.NoErr(err)
is.NoErr(os.Remove(testFname))
}
|
