get rid of bufSize

cmd/window.go

@@ -24,6 +24,7 @@ package cmd
 import "C"
 
 import (
+	"bufio"
 	"container/ring"
 	"encoding/binary"
 	"errors"
@@ -34,16 +35,13 @@ import (
 	"github.com/veandco/go-sdl2/sdl"
 )
 
-// bufSize is the size of the buffer to store data from stdin. NOTE: this might
-// need tuning.
-const bufSize uint = 2048
-
 // milkDropWindow represents the window projectm will render visualizations in.
 type milkDropWindow struct {
 	window  *sdl.Window
 	context sdl.GLContext
 	handle  C.projectm_handle
 	preset  *ring.Ring
+	buffer  *bufio.Reader
 }
 
 /*
@@ -85,6 +83,8 @@ func newMilkDropWindow(width, height int32, presets []string) (*milkDropWindow,
 
 	m.setupPresets(presets)
 
+	m.buffer = bufio.NewReader(os.Stdin)
+
 	m.window, err = sdl.CreateWindow("milkbucket", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, width, height, sdl.WINDOW_OPENGL|sdl.WINDOW_RESIZABLE)
 	if err != nil {
 		return &m, err
@@ -131,16 +131,16 @@ func (m *milkDropWindow) loadPreset(smooth bool) {
  * It returns a bool for if the program should keep running and an error.
  */
 func (m *milkDropWindow) render() (bool, error) {
-	var audioData [bufSize]int16
+	audioData := make([]int16, m.buffer.Size()/2)
 
-	err := binary.Read(os.Stdin, binary.LittleEndian, &audioData)
+	err := binary.Read(m.buffer, binary.LittleEndian, audioData)
 	if err == io.ErrUnexpectedEOF {
 		return false, nil
 	} else if err != nil {
 		return true, err
 	}
 
-	C.projectm_pcm_add_int16(m.handle, (*C.int16_t)(&audioData[0]), C.uint(bufSize), C.PROJECTM_STEREO)
+	C.projectm_pcm_add_int16(m.handle, (*C.int16_t)(&audioData[0]), C.uint(len(audioData)), C.PROJECTM_STEREO)
 
 	C.projectm_opengl_render_frame(m.handle)
 	m.window.GLSwap()