wav2png

package

v1.1.0 Latest Latest Go to latest Published: Jul 14, 2021 License: MIT Imports: 5 Imported by: 0

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Repository

github.com/transcriptaze/wav2png

Links

Open Source Insights

Documentation ¶

Overview ¶

Package wav2png implements the functions required to render an audio waveform as a PNG image. The current implementation supports 16 bit PCM WAV files only.

Index ¶

Constants
Variables
func Antialias(img *image.NRGBA, kernel Kernel) *image.NRGBA
func Fill(img *image.NRGBA, spec FillSpec)
func Grid(spec GridSpec, width, height, padding int) *image.NRGBA
func Render(pcm []float32, fs float64, width, height int, palette Palette, volume float64) *image.NRGBA
type FillSpec
type Fit
- func (f Fit) String() string
type GridSpec
- func NewNoGrid() GridSpec
type Kernel
type NoGrid
- func (g NoGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle
- func (g NoGrid) Colour() color.NRGBA
- func (g NoGrid) HLines(bounds image.Rectangle, padding int) []int
- func (g NoGrid) Overlay() bool
- func (g NoGrid) VLines(bounds image.Rectangle, padding int) []int
type Palette
- func PaletteFromPng(png image.Image) (*Palette, error)
type RectangularGrid
- func NewRectangularGrid(colour color.NRGBA, width, height uint, fit Fit, overlay bool) RectangularGrid
- func (g RectangularGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle
- func (g RectangularGrid) Colour() color.NRGBA
- func (g RectangularGrid) HLines(bounds image.Rectangle, padding int) []int
- func (g RectangularGrid) Overlay() bool
- func (g RectangularGrid) VLines(bounds image.Rectangle, padding int) []int
type SolidFill
- func NewSolidFill(colour color.NRGBA) SolidFill
- func (f SolidFill) Colour() color.NRGBA
- func (f SolidFill) Fill(img *image.NRGBA)
type SquareGrid
- func NewSquareGrid(colour color.NRGBA, size uint, fit Fit, overlay bool) SquareGrid
- func (g SquareGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle
- func (g SquareGrid) Colour() color.NRGBA
- func (g SquareGrid) HLines(bounds image.Rectangle, padding int) []int
- func (g SquareGrid) Overlay() bool
- func (g SquareGrid) VLines(bounds image.Rectangle, padding int) []int

Constants ¶

View Source

const (
	BITS      int32 = 16
	RANGE_MIN int32 = -32768
	RANGE_MAX int32 = +32767
	RANGE     int32 = RANGE_MAX - RANGE_MIN + 1
)

Variables ¶

View Source

var Horizontal = Kernel{
	{0, 0, 0},
	{1, 2, 1},
	{0, 0, 0},
}

View Source

var None = Kernel{
	{0, 0, 0},
	{0, 1, 0},
	{0, 0, 0},
}

View Source

var Soft = Kernel{
	{1, 2, 1},
	{2, 12, 2},
	{1, 2, 1},
}

View Source

var Vertical = Kernel{
	{0, 1, 0},
	{0, 2, 0},
	{0, 1, 0},
}

Functions ¶

func Antialias ¶

func Antialias(img *image.NRGBA, kernel Kernel) *image.NRGBA

func Fill ¶

func Fill(img *image.NRGBA, spec FillSpec)

func Grid ¶

func Grid(spec GridSpec, width, height, padding int) *image.NRGBA

func Render ¶

func Render(pcm []float32, fs float64, width, height int, palette Palette, volume float64) *image.NRGBA

Types ¶

type FillSpec ¶

type FillSpec interface {
	Colour() color.NRGBA
	Fill(img *image.NRGBA)
}

type Fit ¶

type Fit int

const (
	Approximate Fit = iota
	Exact
	AtLeast
	AtMost
	LargerThan
	SmallerThan
)

func (Fit) String ¶

func (f Fit) String() string

type GridSpec ¶

type GridSpec interface {
	Colour() color.NRGBA
	Overlay() bool
	Border(bounds image.Rectangle, padding int) *image.Rectangle
	VLines(bounds image.Rectangle, padding int) []int
	HLines(bounds image.Rectangle, padding int) []int
}

func NewNoGrid ¶

func NewNoGrid() GridSpec

type Kernel ¶

type Kernel [3][3]uint32

type NoGrid ¶

type NoGrid struct {
}

func (NoGrid) Border ¶

func (g NoGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle

func (NoGrid) Colour ¶

func (g NoGrid) Colour() color.NRGBA

func (NoGrid) HLines ¶

func (g NoGrid) HLines(bounds image.Rectangle, padding int) []int

func (NoGrid) Overlay ¶

func (g NoGrid) Overlay() bool

func (NoGrid) VLines ¶

func (g NoGrid) VLines(bounds image.Rectangle, padding int) []int

type Palette ¶

type Palette struct {
	// contains filtered or unexported fields
}

var Ice Palette = Palette{
	// contains filtered or unexported fields
}

var Mono Palette = Palette{
	// contains filtered or unexported fields
}

func PaletteFromPng ¶

func PaletteFromPng(png image.Image) (*Palette, error)

type RectangularGrid ¶

type RectangularGrid struct {
	// contains filtered or unexported fields
}

func NewRectangularGrid ¶

func NewRectangularGrid(colour color.NRGBA, width, height uint, fit Fit, overlay bool) RectangularGrid

func (RectangularGrid) Border ¶

func (g RectangularGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle

func (RectangularGrid) Colour ¶

func (g RectangularGrid) Colour() color.NRGBA

func (RectangularGrid) HLines ¶

func (g RectangularGrid) HLines(bounds image.Rectangle, padding int) []int

func (RectangularGrid) Overlay ¶

func (g RectangularGrid) Overlay() bool

func (RectangularGrid) VLines ¶

func (g RectangularGrid) VLines(bounds image.Rectangle, padding int) []int

type SolidFill ¶

type SolidFill struct {
	// contains filtered or unexported fields
}

func NewSolidFill ¶

func NewSolidFill(colour color.NRGBA) SolidFill

func (SolidFill) Colour ¶

func (f SolidFill) Colour() color.NRGBA

func (SolidFill) Fill ¶

func (f SolidFill) Fill(img *image.NRGBA)

type SquareGrid ¶

type SquareGrid struct {
	// contains filtered or unexported fields
}

func NewSquareGrid ¶

func NewSquareGrid(colour color.NRGBA, size uint, fit Fit, overlay bool) SquareGrid

func (SquareGrid) Border ¶

func (g SquareGrid) Border(bounds image.Rectangle, padding int) *image.Rectangle

func (SquareGrid) Colour ¶

func (g SquareGrid) Colour() color.NRGBA

func (SquareGrid) HLines ¶

func (g SquareGrid) HLines(bounds image.Rectangle, padding int) []int

func (SquareGrid) Overlay ¶

func (g SquareGrid) Overlay() bool

func (SquareGrid) VLines ¶

func (g SquareGrid) VLines(bounds image.Rectangle, padding int) []int

Source Files ¶

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