/
app.go
129 lines (107 loc) · 2.47 KB
/
app.go
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package app
import (
"io"
"log"
)
type App struct {
audio AudioFileController
model Model
batch int
chunkSize int
buffer []float32
buffLen int
}
type AudioFileController interface {
Load(samples int) ([]float32, int, error)
Write([]float32) error
Close()
}
type Model interface {
Inference(i []float32) ([]float32, error)
}
func New(name string, audio AudioFileController, batch, chunkSize int) *App {
m, err := NewTS9(name, batch)
if err != nil {
log.Fatal(err)
}
return &App{
audio: audio,
model: m,
batch: batch,
chunkSize: chunkSize,
buffLen: ((batch / chunkSize) + 1) * chunkSize,
}
}
// Copy last chunk to beginning of the buffer
func (a *App) copyLastChunk() {
copy(a.buffer[:a.chunkSize], a.buffer[len(a.buffer)-a.chunkSize:])
}
// Load chunks at position
//
// Params
// 'pos': start position in chunks, 0 is first chunk
//
// Results
// 'n': read samples
// 'loaded': is buffer fully loaded?
// 'err': error or nil
func (a *App) loadChunksAtPosition(pos int) (n int, loaded bool, err error) {
buf, n, err := a.audio.Load(a.buffLen - (pos * a.chunkSize))
if err != nil || n == 0 {
return
}
if n == a.buffLen {
loaded = true
}
copy(a.buffer[pos*a.chunkSize:], buf[:n])
a.buffer = a.buffer[:n+(pos*a.chunkSize)]
return
}
func (a *App) initBuffer() {
a.buffer = make([]float32, a.buffLen)
}
func (a *App) Process() {
var (
n int
loaded bool
exit bool
batchBuffer = make([]float32, 0, (a.buffLen-a.chunkSize)*a.chunkSize)
)
a.initBuffer()
// Load chunks starting at pos 0
n, loaded, err := a.loadChunksAtPosition(0)
if err != nil || n == 0 {
return
}
for {
if !loaded {
// Buffer is not fully loaded
// We should prepare complete buffer to run batch
tmp := make([]float32, a.buffLen-len(a.buffer))
a.buffer = append(a.buffer, tmp...)
// there is no data in last chunk
if n <= (a.buffLen - a.chunkSize - 1) {
exit = true
}
}
batchBuffer = batchBuffer[:0]
for i := 0; i < a.batch; i += 1 {
batchBuffer = append(batchBuffer, a.buffer[i:i+a.chunkSize]...)
}
modelout, err := a.model.Inference(batchBuffer)
if err != nil {
log.Fatal(err)
}
if err := a.audio.Write(modelout); err != nil {
log.Println("Write: ", err)
return
}
// Copy last chunk to beginning
a.copyLastChunk()
// Load n-1 chunks, starts from 1 (second chunk)
n, loaded, err = a.loadChunksAtPosition(1)
if err != io.EOF && err != nil || exit {
return
}
}
}