Created
July 10, 2021 18:41
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Split audio files into constant-length chunks
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package main | |
import ( | |
"fmt" | |
"io" | |
"log" | |
"os" | |
"path/filepath" | |
"github.com/unixpickle/essentials" | |
"github.com/unixpickle/ffmpego" | |
) | |
const ( | |
SampleRate = 16000 | |
ChunkSize = SampleRate * 15 | |
ChunkMin = SampleRate * 4 | |
) | |
func main() { | |
if len(os.Args) < 3 { | |
fmt.Fprintln(os.Stderr, "Usage: splitaudio <input> [input ...] <output dir>") | |
os.Exit(1) | |
} | |
inputs := os.Args[1 : len(os.Args)-1] | |
outputDir := os.Args[len(os.Args)-1] | |
chunkIdx := 0 | |
for _, file := range inputs { | |
log.Println("Splitting up", file) | |
SplitFile(file, outputDir, &chunkIdx) | |
} | |
} | |
func SplitFile(path, outputDir string, chunkIdx *int) { | |
ar, err := ffmpego.NewAudioReaderResampled(path, SampleRate) | |
essentials.Must(err) | |
defer ar.Close() | |
for { | |
chunk := make([]float64, ChunkSize) | |
n, err := ar.ReadSamples(chunk) | |
if n > ChunkMin { | |
*chunkIdx += 1 | |
name := fmt.Sprintf("chunk_%06d.flac", *chunkIdx) | |
aw, err := ffmpego.NewAudioWriter(filepath.Join(outputDir, name), SampleRate) | |
essentials.Must(err) | |
essentials.Must(aw.WriteSamples(chunk)) | |
aw.Close() | |
} | |
if err == io.EOF { | |
break | |
} | |
essentials.Must(err) | |
} | |
} |
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