audio: added validate functions for device config

codec/codecutil/list.go

@@ -24,7 +24,13 @@ LICENSE
 
 package codecutil
 
+import "fmt"
+
+// numCodecs is the number of entries in the list of codecs.
+const numCodecs = 5
+
 // A global list containing all available codecs for reference in any application.
+// When adding or removing a codec from this list, the numCodecs const must be updated.
 const (
 	PCM = iota
 	ADPCM
@@ -32,3 +38,11 @@ const (
 	H265
 	MJPEG
 )
+
+// Validate recieves an int representing a codec and checks if it is valid.
+func Validate(codec uint8) error {
+	if codec < 0 || codec >= numCodecs {
+		return fmt.Errorf("invalid codec")
+	}
+	return nil
+}

input/audio/audio.go

@@ -93,6 +93,9 @@ type OpenError error
 
 // NewDevice initializes and returns an Device which can be started, read from, and stopped.
 func NewDevice(cfg *Config, l Logger) (*Device, error) {
+
+	validate(cfg)
+
 	d := &Device{
 		Config: cfg,
 		l:      l,
@@ -169,6 +172,27 @@ func (d *Device) ChunkSize() int {
 	return d.chunkSize
 }
 
+// validate checks if Config parameters are valid and returns an error if they are not.
+func validate(c *Config) error {
+	if c.SampleRate <= 0 {
+		return fmt.Errorf("invalid sample rate: %v", c.SampleRate)
+	}
+	if c.Channels <= 0 {
+		return fmt.Errorf("invalid number of channels: %v", c.Channels)
+	}
+	if c.BitDepth <= 0 {
+		return fmt.Errorf("invalid bitdepth: %v", c.BitDepth)
+	}
+	if c.RecPeriod <= 0 {
+		return fmt.Errorf("invalid recording period: %v", c.RecPeriod)
+	}
+	err := codecutil.Validate(c.Codec)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 // open the recording device with the given name and prepare it to record.
 // If name is empty, the first recording device is used.
 func (d *Device) open() error {