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package wav
// #define DR_WAV_IMPLEMENTATION
// #include "dr_wav.h"
import "C"
import (
"fmt"
)
const batchSize = 64
func Load(filename string) (<-chan [2]int16, error) {
cfname := C.CString(filename)
wav := C.drwav_open_file(cfname)
if wav == nil {
return nil, fmt.Errorf("Unable to initialize drwav.")
}
if int(wav.channels) != 2 {
C.drwav_close(wav)
return nil, fmt.Errorf("Wrong number of channels!")
}
if int(wav.sampleRate) != 44100 {
C.drwav_close(wav)
return nil, fmt.Errorf("Wrong sample rate.")
}
ch := make(chan [2]int16, 1024*32)
go func() {
buf := C.malloc(C.size_t(batchSize * wav.bytesPerSample))
defer C.free(buf)
defer C.drwav_close(wav)
for i := 0; i < int(wav.totalSampleCount)/batchSize; i++ {
readSamples := C.drwav_read_s16(wav, batchSize, (*C.dr_int16)(buf))
slc := (*[1 << 30]int16)(buf)[:readSamples:readSamples]
for i := 0; i < int(readSamples); i += 2 {
ch <- [2]int16{slc[i], slc[i+1]}
}
if readSamples < batchSize {
break
}
}
close(ch)
}()
return ch, nil
}
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