revid: simplify write rate

container/mts/options.go

@@ -97,12 +97,12 @@ func MediaType(mt int) func(*Encoder) error {
 // Rate is an option that can be passed to NewEncoder. It is used to specifiy
 // the rate at which the access units should be played in playback. This will
 // be used to create timestamps and counts such as PTS and PCR.
-func Rate(r int) func(*Encoder) error {
+func Rate(r float64) func(*Encoder) error {
 	return func(e *Encoder) error {
 		if r < 1 || r > 60 {
 			return ErrInvalidRate
 		}
-		e.writePeriod = time.Duration(float64(time.Second) / float64(r))
+		e.writePeriod = time.Duration(float64(time.Second) / r)
 		return nil
 	}
 }

go.sum

@@ -66,6 +66,7 @@ golang.org/x/image v0.0.0-20200119044424-58c23975cae1 h1:5h3ngYt7+vXCDZCup/HkCQg
 golang.org/x/image v0.0.0-20200119044424-58c23975cae1/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/sys v0.0.0-20190913121621-c3b328c6e5a7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

revid/config/config.go

@@ -232,7 +232,6 @@ type Config struct {
 
 	VerticalFlip bool // VerticalFlip flips video vertically for Raspivid input.
 	Width        uint // Width defines the input video width Raspivid input.
-	WriteRate    float64 // WriteRate is how many times a second revid encoders will be written to.
 }
 
 // Validate checks for any errors in the config fields and defaults settings

revid/config/config_test.go

@@ -51,7 +51,6 @@ func TestValidate(t *testing.T) {
 		BurstPeriod:    defaultBurstPeriod,
 		MinFrames:      defaultMinFrames,
 		FrameRate:      defaultFrameRate,
-		WriteRate:      defaultWriteRate,
 		ClipDuration:   defaultClipDuration,
 		PSITime:        defaultPSITime,
 		FileFPS:        defaultFileFPS,

revid/config/parameter/generate_parameters.go

@@ -130,7 +130,6 @@ var params = []Param{
 	{N: "VBRQuality", BT: "uint8", E: []string{"Standard", "Fair", "Good", "Great", "Excellent"}},
 	{N: "VerticalFlip", BT: "bool"},
 	{N: "Width", BT: "uint", Min: 640, Max: 1920},
-	{N: "WriteRate", BT: "float64"},
 }
 
 const fileHeader = `

revid/config/parameter/parameters.go

@@ -915,16 +915,3 @@ func (w *Width) Set(val string) error {
 	*w = Width(_v)
 	return nil
 }
-
-type WriteRate float64
-
-func (w *WriteRate) Type() string { return "float64" }
-func (w *WriteRate) Set(val string) error {
-	_v, err := strconv.ParseFloat(val, 64)
-	if err != nil {
-		return fmt.Errorf("could not convert set string to float: %w", err)
-	}
-
-	*w = WriteRate(_v)
-	return nil
-}

revid/config/variables.go

@@ -49,7 +49,6 @@ const (
 	defaultBurstPeriod  = 10 // Seconds
 	defaultMinFrames    = 100
 	defaultFrameRate    = 25
-	defaultWriteRate    = 25
 	defaultClipDuration = 0
 	defaultPSITime      = 2
 	defaultFileFPS      = 0
@@ -536,14 +535,6 @@ var Variables = []struct {
 		Type_:  "uint",
 		Update: func(c *Config, v string) { c.Width = parseUint("Width", v, c) },
 	},
-	{
-		Name:   "WriteRate",
-		Type_:  "uint",
-		Update: func(c *Config, v string) { c.WriteRate = float64(parseUint("WriteRate", v, c)) },
-		Validate: func(c *Config) {
-			c.WriteRate = float64(lessThanOrEqual("WriteRate", uint(c.WriteRate), 0, c, defaultWriteRate))
-		},
-	},
 }
 
 func parseUint(n, v string, c *Config) uint {

revid/revid.go

@@ -169,7 +169,7 @@ func (r *Revid) reset(c config.Config) error {
 
 	r.cfg.Logger.Log(logger.Debug, "setting up revid pipeline")
 	err = r.setupPipeline(
-		func(dst io.WriteCloser, fps float64) (io.WriteCloser, error) {
+		func(dst io.WriteCloser, rate float64) (io.WriteCloser, error) {
 			var st int
 			var encOptions []func(*mts.Encoder) error
 
@@ -212,10 +212,11 @@ func (r *Revid) reset(c config.Config) error {
 			case config.InputAudio:
 				st = mts.EncodeAudio
 				encOptions = append(encOptions, mts.TimeBasedPSI(time.Duration(r.cfg.PSITime)*time.Second))
+				rate = 1 / r.cfg.RecPeriod
 			default:
 				panic("unknown input type")
 			}
-			encOptions = append(encOptions, mts.MediaType(st), mts.Rate(int(fps)))
+			encOptions = append(encOptions, mts.MediaType(st), mts.Rate(rate))
 			return mts.NewEncoder(dst, &encLog{r.cfg.Logger}, encOptions...)
 		},
 		func(dst io.WriteCloser, fps int) (io.WriteCloser, error) {
@@ -311,7 +312,7 @@ func (r *Revid) setupPipeline(mtsEnc func(dst io.WriteCloser, rate float64) (io.
 	// as a destination.
 	if len(mtsSenders) != 0 {
 		mw := multiWriter(mtsSenders...)
-		e, _ := mtsEnc(mw, r.cfg.WriteRate)
+		e, _ := mtsEnc(mw, float64(r.cfg.FrameRate))
 		encoders = append(encoders, e)
 	}