94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package video
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import (
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"context"
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"image"
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"image/color"
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"io"
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"time"
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"github.com/nfnt/resize"
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"github.com/pion/mediadevices/pkg/frame"
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"github.com/pion/mediadevices/pkg/io/video"
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"github.com/pion/mediadevices/pkg/prop"
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"github.com/sirupsen/logrus"
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_ "github.com/jbuchbinder/gopnm"
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)
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const DefaultFPS float32 = 60.0
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type PPMStreamDriver struct {
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Height, Width int
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FPS float32
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PPMImage <-chan io.ReadCloser
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closed <-chan struct{}
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cancel func()
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}
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func (v *PPMStreamDriver) Open() error {
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defer logrus.Debug("device opened")
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ctx, cancel := context.WithCancel(context.Background())
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v.closed = ctx.Done()
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v.cancel = cancel
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return nil
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}
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func (v *PPMStreamDriver) Close() error {
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v.cancel()
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return nil
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}
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func (v *PPMStreamDriver) Properties() []prop.Media {
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return []prop.Media{
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{
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Video: prop.Video{
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Width: v.Width,
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Height: v.Height,
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FrameRate: v.FPS,
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FrameFormat: frame.FormatYUYV,
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},
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},
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}
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}
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func (v *PPMStreamDriver) VideoRecord(p prop.Media) (video.Reader, error) {
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logrus.Debug(p)
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canvas := image.NewYCbCr(
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image.Rect(0, 0, p.Width, p.Height),
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image.YCbCrSubsampleRatio420,
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)
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r := video.ReaderFunc(func() (img image.Image, release func(), err error) {
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ticker := time.NewTicker(time.Second / time.Duration(p.FrameRate))
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defer ticker.Stop()
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select {
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case <-v.closed:
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return nil, func() {}, io.EOF
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case ppmF := <-v.PPMImage:
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defer ppmF.Close()
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img, _, err := image.Decode(ppmF)
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if err != nil {
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return nil, func() {}, err
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}
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// resize image and draw it to canvas
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resized := resize.Resize(uint(p.Width), uint(p.Height), img, resize.Lanczos3)
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for y := 0; y < resized.Bounds().Dy(); y++ {
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for x := 0; x < resized.Bounds().Dx(); x++ {
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r, g, b, _ := resized.At(x, y).RGBA()
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Y, Cb, Cr := color.RGBToYCbCr(uint8(r), uint8(g), uint8(b))
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canvas.Y[canvas.YOffset(x, y)] = Y
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canvas.Cb[canvas.COffset(x, y)] = Cb
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canvas.Cr[canvas.COffset(x, y)] = Cr
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}
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}
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case <-ticker.C:
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}
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return canvas, func() {}, nil
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})
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return r, nil
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}
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