128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
package main
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import (
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"encoding/binary"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestAudioVersionId(t *testing.T) {
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bytes := []byte{0xff, 0xe8, 0, 0}
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h, err := newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, AudioVersionReserved, h.AudioVersionId())
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bytes = []byte{0xff, 0xf0, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, AudioVersionMPEG2, h.AudioVersionId())
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bytes = []byte{0xff, 0xff, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, AudioVersionMPEG1, h.AudioVersionId())
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bytes = []byte{0xff, 0xe0, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, AudioVersionMPEG25, h.AudioVersionId())
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}
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func TestLayerIndex(t *testing.T) {
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bytes := []byte{0xff, 0xe2, 0, 0}
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h, err := newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, LayerIndexIII, h.LayerIndex())
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bytes = []byte{0xff, 0xe4, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, LayerIndexII, h.LayerIndex())
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bytes = []byte{0xff, 0xe6, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.Equal(t, LayerIndexI, h.LayerIndex())
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}
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func TestIsPrivate(t *testing.T) {
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bytes := []byte{0xff, 0xe1, 0, 0}
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h, err := newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.True(t, h.IsPrivate())
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bytes = []byte{0xff, 0xe0, 0, 0}
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h, err = newHeader(binary.LittleEndian.Uint32(bytes))
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require.NoError(t, err)
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assert.False(t, h.IsPrivate())
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}
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func TestSampleRate(t *testing.T) {
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testCases := []struct {
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name string
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bytes []byte
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expSampleRate uint32
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}{
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{
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"empty header",
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[]byte{0, 0, 0, 0},
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0,
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},
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{
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"MPEG1 LayerI 32kbps",
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[]byte{0xff, 0xfe, 0x10, 0},
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32,
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},
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{
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"MPEG1 LayerI 448kbps",
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[]byte{0xff, 0xfe, 0xe0, 0},
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448,
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},
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{
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"MPEG1 LayerII 32kbps",
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[]byte{0xff, 0xfc, 0x10, 0},
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32,
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},
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{
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"MPEG1 LayerII 448kbps",
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[]byte{0xff, 0xfc, 0xe0, 0},
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384,
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},
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{
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"MPEG1 LayerIII 32kbps",
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[]byte{0xff, 0xfa, 0x10, 0},
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32,
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},
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{
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"MPEG1 LayerIII 128kbps",
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[]byte{0xff, 0xfa, 0x90, 0},
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128,
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},
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{
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"MPEG1 LayerIII 160kbps",
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[]byte{0xff, 0xfa, 0xa0, 0},
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160,
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},
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{
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"MPEG1 LayerIII 320kbps",
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[]byte{0xff, 0xfa, 0xe0, 0x0},
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320,
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},
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{
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"MPEG1 LayerIII reserved",
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[]byte{0xff, 0xfa, 0xf0, 0x0},
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0,
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},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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h, err := newHeader(binary.LittleEndian.Uint32(tc.bytes))
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require.NoError(t, err)
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assert.Equal(t, tc.expSampleRate, h.SampleRate())
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})
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}
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}
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