185 lines
3.6 KiB
Go
185 lines
3.6 KiB
Go
package audio
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import (
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"git.gammaspectra.live/S.O.N.G/Kirika/vector"
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"sync/atomic"
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)
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type int16Source struct {
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BitDepth int
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SampleRate int
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Channels int
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Blocks chan []int16
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locked atomic.Bool
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}
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func newInt16Source(bitDepth, sampleRate, channels int) TypedSource[int16] {
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if bitDepth <= 0 || bitDepth > 16 {
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return nil
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}
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return &int16Source{
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BitDepth: bitDepth,
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SampleRate: sampleRate,
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Channels: channels,
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Blocks: make(chan []int16),
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}
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}
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func (s *int16Source) Split(n int) []Source {
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return Split[int16](s, n)
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}
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func (s *int16Source) New() TypedSource[int16] {
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return newInt16Source(s.BitDepth, s.SampleRate, s.Channels)
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}
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func (s *int16Source) GetBlocks() chan []int16 {
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if s.Locked() {
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return nil
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}
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if !s.locked.Swap(true) {
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return s.Blocks
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}
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return nil
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}
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func (s *int16Source) Close() {
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close(s.Blocks)
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}
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func (s *int16Source) GetSampleRate() int {
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return s.SampleRate
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}
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func (s *int16Source) GetChannels() int {
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return s.Channels
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}
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func (s *int16Source) GetBitDepth() int {
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return s.BitDepth
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}
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func (s *int16Source) Locked() bool {
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return s.locked.Load()
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}
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func (s *int16Source) Unlock() {
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s.locked.Store(false)
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}
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func (s *int16Source) SwapBlocks(blocks chan []int16) chan []int16 {
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oldBlocks := s.Blocks
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s.Blocks = blocks
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return oldBlocks
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}
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func (s *int16Source) GetFormat() SourceFormat {
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return SourceInt16
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}
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func (s *int16Source) ToFloat32() TypedSource[float32] {
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if s.Locked() {
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return nil
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}
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source := newFloat32Source(s.BitDepth, s.SampleRate, s.Channels)
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go func() {
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defer source.Close()
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for block := range s.GetBlocks() {
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source.IngestFloat32(vector.Int16ToFloat32(block, s.BitDepth))
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}
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}()
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return source
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}
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func (s *int16Source) ToInt16() TypedSource[int16] {
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return s
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}
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func (s *int16Source) ToInt32(bitDepth int) TypedSource[int32] {
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if s.Locked() {
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return nil
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}
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source := newInt32Source(bitDepth, s.SampleRate, s.Channels)
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go func() {
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diff := s.BitDepth - bitDepth
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if diff >= 0 {
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defer source.Close()
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for block := range s.GetBlocks() {
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buf := make([]int32, len(block))
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for i := range block {
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buf[i] = int32(block[i]) >> diff
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}
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source.IngestInt32(buf, bitDepth)
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}
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} else {
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diff = -diff
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defer source.Close()
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for block := range s.GetBlocks() {
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buf := make([]int32, len(block))
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for i := range block {
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buf[i] = int32(block[i]) << diff
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}
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source.IngestInt32(buf, bitDepth)
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}
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}
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}()
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return source
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}
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func (s *int16Source) IngestFloat32(buf []float32) {
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s.Blocks <- vector.Float32ToInt16(buf)
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}
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func (s *int16Source) IngestInt8(buf []int8, bitDepth int) {
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block := make([]int16, len(buf))
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for i := range buf {
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block[i] = int16(buf[i]) << (s.BitDepth - bitDepth)
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}
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s.Blocks <- block
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}
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func (s *int16Source) IngestInt16(buf []int16, bitDepth int) {
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if bitDepth == s.BitDepth {
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s.Blocks <- buf
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} else {
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block := make([]int16, len(buf))
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for i := range buf {
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block[i] = buf[i] << (s.BitDepth - bitDepth)
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}
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s.Blocks <- block
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}
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}
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func (s *int16Source) IngestInt24(buf []byte, bitDepth int) {
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block := make([]int16, len(buf)/3)
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for i := 0; i < len(buf); i += 3 {
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sample := uint32(buf[i])
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sample += uint32(buf[i+1]) << 8
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sample += uint32(buf[i+2]) << 16
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//sign extend
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block[i/3] = int16(int32(sample<<8) >> (bitDepth - s.BitDepth + 8))
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}
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s.Blocks <- block
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}
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func (s *int16Source) IngestInt32(buf []int32, bitDepth int) {
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block := make([]int16, len(buf))
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for i := range buf {
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block[i] = int16(buf[i] >> (bitDepth - s.BitDepth))
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}
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s.Blocks <- block
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}
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func (s *int16Source) IngestNative(buf []int16, bitDepth int) {
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s.IngestInt16(buf, bitDepth)
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}
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