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refactor(oto): reuse temp buffers for repeated calls to convert buffer
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1d91603e36
commit
c68d9d3bf5
@ -1,29 +1,25 @@
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package oto
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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)
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// FloatBufferTo16BitLE is a naive helper method to convert []float32 buffers to
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// 16-bit little-endian integer buffers.
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// TODO: optimize/refactor this, current is far from the best solution
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func FloatBufferTo16BitLE(buff []float32) ([]byte, error) {
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var buf bytes.Buffer
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for i, v := range buff {
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// 16-bit little-endian, but encoded in byte buffer
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//
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// Appends the encoded bytes into "to" slice, allowing you to preallocate the
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// capacity or just use nil
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func FloatBufferTo16BitLE(from []float32, to []byte) []byte {
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for _, v := range from {
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var uv int16
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if v < -1.0 {
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uv = -math.MaxInt16
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uv = -math.MaxInt16 // we are a bit lazy: -1.0 is encoded as -32767, as this makes math easier, and -32768 is unused
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} else if v > 1.0 {
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uv = math.MaxInt16
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} else {
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uv = int16(v * math.MaxInt16)
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}
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if err := binary.Write(&buf, binary.LittleEndian, uv); err != nil {
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return nil, fmt.Errorf("error converting buffer (@ %v, value %v) to bytes: %w", i, v, err)
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}
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to = append(to, byte(uv&255), byte(uv>>8))
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}
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return buf.Bytes(), nil
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return to
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}
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@ -10,10 +10,7 @@ import (
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func TestFloatBufferToBytes(t *testing.T) {
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floats := []float32{0, 0.000489128, 0, 0.0019555532, 0, 0.0043964, 0, 0.007806882, 0, 0.012180306, 0, 0.017508084, 0, 0.023779746, 0, 0.030982954, 0, 0.039103523, 0, 0.04812544, 0, 0.05803088, 0, 0.068800256, 0, 0.08041221, 0, 0.09284368, 0, 0.10606992, 0, 0.120064534, 0, 0.13479951, 0, 0.1502453, 0, 0.16637078, 0, 0.18314338, 0, 0.20052913, 0, 0.21849263, 0, 0.23699719, 0, 0.2560048, 0, 0.27547634, 0, 0.29537144, 0, 0.31564865, 0, 0.33626547, 0, 0.35717854, 0, 0.37834346, 0, 0.39971504, 0, 0.4212474, 0, 0.4428938, 0, 0.46460703, 0, 0.48633927, 0, 0.50804216, 0, 0.52966696, 0, 0.5511646, 0, 0.57248586, 0, 0.5935812, 0, 0.6144009, 0, 0.63489544, 0, 0.6550152, 0, 0.67471063, 0, 0.6939326, 0, 0.712632, 0, 0.7307603, 0, 0.7482692, 0, 0.7651111, 0, 0.7812389}
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bytes := []byte{0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x40, 0x0, 0x0, 0x0, 0x90, 0x0, 0x0, 0x0, 0xff, 0x0, 0x0, 0x0, 0x8f, 0x1, 0x0, 0x0, 0x3d, 0x2, 0x0, 0x0, 0xb, 0x3, 0x0, 0x0, 0xf7, 0x3, 0x0, 0x0, 0x1, 0x5, 0x0, 0x0, 0x28, 0x6, 0x0, 0x0, 0x6d, 0x7, 0x0, 0x0, 0xce, 0x8, 0x0, 0x0, 0x4a, 0xa, 0x0, 0x0, 0xe2, 0xb, 0x0, 0x0, 0x93, 0xd, 0x0, 0x0, 0x5e, 0xf, 0x0, 0x0, 0x40, 0x11, 0x0, 0x0, 0x3b, 0x13, 0x0, 0x0, 0x4b, 0x15, 0x0, 0x0, 0x71, 0x17, 0x0, 0x0, 0xaa, 0x19, 0x0, 0x0, 0xf7, 0x1b, 0x0, 0x0, 0x55, 0x1e, 0x0, 0x0, 0xc4, 0x20, 0x0, 0x0, 0x42, 0x23, 0x0, 0x0, 0xce, 0x25, 0x0, 0x0, 0x66, 0x28, 0x0, 0x0, 0xa, 0x2b, 0x0, 0x0, 0xb7, 0x2d, 0x0, 0x0, 0x6d, 0x30, 0x0, 0x0, 0x29, 0x33, 0x0, 0x0, 0xeb, 0x35, 0x0, 0x0, 0xb0, 0x38, 0x0, 0x0, 0x77, 0x3b, 0x0, 0x0, 0x3f, 0x3e, 0x0, 0x0, 0x7, 0x41, 0x0, 0x0, 0xcb, 0x43, 0x0, 0x0, 0x8c, 0x46, 0x0, 0x0, 0x46, 0x49, 0x0, 0x0, 0xf9, 0x4b, 0x0, 0x0, 0xa4, 0x4e, 0x0, 0x0, 0x43, 0x51, 0x0, 0x0, 0xd6, 0x53, 0x0, 0x0, 0x5c, 0x56, 0x0, 0x0, 0xd2, 0x58, 0x0, 0x0, 0x36, 0x5b, 0x0, 0x0, 0x88, 0x5d, 0x0, 0x0, 0xc6, 0x5f, 0x0, 0x0, 0xee, 0x61, 0x0, 0x0, 0xfe, 0x63}
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converted, err := oto.FloatBufferTo16BitLE(floats)
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if err != nil {
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t.Fatalf("FloatBufferTo16BitLE threw an error")
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}
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converted := oto.FloatBufferTo16BitLE(floats, nil)
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for i, v := range converted {
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if bytes[i] != v {
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t.Fail()
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@ -34,10 +31,7 @@ func TestFloatBufferToBytesLimits(t *testing.T) {
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0xDE, 0x7F, // float 0.999 = 0x7FDE = 0111111111011110
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0x22, 0x80, // float -0.999 = 0x8022 = 1000000000100010
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}
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converted, err := oto.FloatBufferTo16BitLE(floats)
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if err != nil {
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t.Fatalf("FloatBufferTo16BitLE threw an error")
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}
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converted := oto.FloatBufferTo16BitLE(floats, nil)
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for i, v := range converted {
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if bytes[i] != v {
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t.Fail()
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16
oto/oto.go
16
oto/oto.go
@ -8,10 +8,13 @@ import (
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)
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type OtoContext oto.Context
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type OtoOutput oto.Player
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type OtoOutput struct {
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player *oto.Player
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tmpBuffer []byte
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}
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func (c *OtoContext) Output() sointu.AudioSink {
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return (*OtoOutput)((*oto.Context)(c).NewPlayer())
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return &OtoOutput{player: (*oto.Context)(c).NewPlayer(), tmpBuffer: make([]byte, 0)}
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}
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const otoBufferSize = 8192
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@ -34,9 +37,10 @@ func (c *OtoContext) Close() error {
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// Play implements the audio.Player interface for OtoPlayer
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func (o *OtoOutput) WriteAudio(floatBuffer []float32) (err error) {
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if byteBuffer, err := FloatBufferTo16BitLE(floatBuffer); err != nil {
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return fmt.Errorf("cannot convert buffer to bytes: %w", err)
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} else if _, err := (*oto.Player)(o).Write(byteBuffer); err != nil {
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// we reuse the old capacity tmpBuffer by setting its length to zero. then,
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// we save the tmpBuffer so we can reuse it next time
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o.tmpBuffer = FloatBufferTo16BitLE(floatBuffer, o.tmpBuffer[:0])
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if _, err := o.player.Write(o.tmpBuffer); err != nil {
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return fmt.Errorf("cannot write to player: %w", err)
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}
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return nil
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@ -44,7 +48,7 @@ func (o *OtoOutput) WriteAudio(floatBuffer []float32) (err error) {
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// Close disposes of resources
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func (o *OtoOutput) Close() error {
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if err := (*oto.Player)(o).Close(); err != nil {
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if err := o.player.Close(); err != nil {
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return fmt.Errorf("cannot close oto player: %w", err)
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}
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return nil
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