diff --git a/codec/pcm/pcm.go b/codec/pcm/pcm.go
index 9e8393f9..5500c97e 100644
--- a/codec/pcm/pcm.go
+++ b/codec/pcm/pcm.go
@@ -43,26 +43,10 @@ const (
 	Unknown SampleFormat = -1
 )
 
-// Common sample formats that are used.
+// Sample formats that we use.
 const (
-	S8 SampleFormat = iota
-	U8
-	S16_LE
-	S16_BE
-	U16_LE
-	U16_BE
-	S24_LE
-	S24_BE
-	U24_LE
-	U24_BE
+	S16_LE SampleFormat = iota
 	S32_LE
-	S32_BE
-	U32_LE
-	U32_BE
-	FLOAT_LE
-	FLOAT_BE
-	FLOAT64_LE
-	FLOAT64_BE
 	// There are many more:
 	// https://linux.die.net/man/1/arecord
 	// https://trac.ffmpeg.org/wiki/audio%20types
@@ -212,87 +196,23 @@ func gcd(a, b int) int {
 // String returns the string representation of a SampleFormat.
 func (f SampleFormat) String() string {
 	switch f {
-	case S8:
-		return "S8"
-	case U8:
-		return "U8"
 	case S16_LE:
 		return "S16_LE"
-	case S16_BE:
-		return "S16_BE"
-	case U16_LE:
-		return "U16_LE"
-	case U16_BE:
-		return "U16_BE"
-	case S24_LE:
-		return "S24_LE"
-	case S24_BE:
-		return "S24_BE"
-	case U24_LE:
-		return "U24_LE"
-	case U24_BE:
-		return "U24_BE"
 	case S32_LE:
 		return "S32_LE"
-	case S32_BE:
-		return "S32_BE"
-	case U32_LE:
-		return "U32_LE"
-	case U32_BE:
-		return "U32_BE"
-	case FLOAT_LE:
-		return "FLOAT_LE"
-	case FLOAT_BE:
-		return "FLOAT_BE"
-	case FLOAT64_LE:
-		return "FLOAT64_LE"
-	case FLOAT64_BE:
-		return "FLOAT64_BE"
 	default:
-		return fmt.Sprintf("Invalid FormatType (%d)", f)
+		return "Unknown"
 	}
 }
 
 // SFFromString takes a string representing a sample format and returns the corresponding SampleFormat.
 func SFFromString(s string) (SampleFormat, error) {
 	switch s {
-	case "S8":
-		return S8, nil
-	case "U8":
-		return U8, nil
 	case "S16_LE":
 		return S16_LE, nil
-	case "S16_BE":
-		return S16_BE, nil
-	case "U16_LE":
-		return U16_LE, nil
-	case "U16_BE":
-		return U16_BE, nil
-	case "S24_LE":
-		return S24_LE, nil
-	case "S24_BE":
-		return S24_BE, nil
-	case "U24_LE":
-		return U24_LE, nil
-	case "U24_BE":
-		return U24_BE, nil
 	case "S32_LE":
 		return S32_LE, nil
-	case "S32_BE":
-		return S32_BE, nil
-	case "U32_LE":
-		return U32_LE, nil
-	case "U32_BE":
-		return U32_BE, nil
-	case "FLOAT_LE":
-		return FLOAT_LE, nil
-	case "FLOAT_BE":
-		return FLOAT_BE, nil
-	case "FLOAT64_LE":
-		return FLOAT64_LE, nil
-	case "FLOAT64_BE":
-		return FLOAT64_BE, nil
 	default:
-		return Unknown, errors.Errorf("Unknown FormatType (%s)", s)
+		return Unknown, errors.Errorf("unknown sample format (%s)", s)
 	}
 }