codec/mjpeg/jpeg.go: improve Context struct field names

codec/mjpeg/jpeg.go

@@ -140,15 +140,15 @@ var defaultQuantisers = []byte{
 type Context struct {
 	qTables    [128][128]byte
 	qTablesLen [128]byte
-	p          *putBuffer
-	d          io.Writer
+	buf        *putBuffer
+	dst        io.Writer
 }
 
-// NewContext will return a new Context.
+// NewContext will return a new Context with destination d.
 func NewContext(d io.Writer) *Context {
 	return &Context{
-		d: d,
-		p: newPutBuffer(make([]byte, maxJPEG)),
+		dst: d,
+		buf: newPutBuffer(make([]byte, maxJPEG)),
 	}
 }
 
@@ -218,12 +218,12 @@ func (c *Context) ParsePayload(p []byte, m bool) error {
 			qLen = len(qTable)
 		}
 
-		c.p.reset()
+		c.buf.reset()
 
-		writeHeader(c.p, t, width, height, qLen/64, dri, qTable)
+		writeHeader(c.buf, t, width, height, qLen/64, dri, qTable)
 	}
 
-	if c.p.len() == 0 {
+	if c.buf.len() == 0 {
 		// Must have missed start of frame? So ignore and wait for start.
 		return nil
 	}
@@ -235,16 +235,16 @@ func (c *Context) ParsePayload(p []byte, m bool) error {
 	// to determine if there are missing frames.
 
 	// Write frame data
-	err := b.writeTo(c.p, b.remaining())
+	err := b.writeTo(c.buf, b.remaining())
 	if err != nil {
 		return fmt.Errorf("could not write remaining frame data to output buffer: %w", err)
 	}
 
 	if m {
 		// End of image marker.
-		mark(c.p, codeEOI)
+		mark(c.buf, codeEOI)
 
-		_, err = c.p.writeTo(c.d)
+		_, err = c.buf.writeTo(c.dst)
 		if err != nil {
 			return fmt.Errorf("could not write JPEG to dst: %w", err)
 		}