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picam_remote.go
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/
picam_remote.go
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package rpi
import (
"context"
"fmt"
"io"
"github.com/LK4D4/joincontext"
proto "github.com/gbbirkisson/rpi/pkg/proto"
"google.golang.org/grpc"
)
// NewPiCamRemote creates a new remote PiCam
func NewPiCamRemote(connection *grpc.ClientConn) PiCam {
return &piCamGrpc{client: proto.NewPiCamClient(connection)}
}
type piCamGrpc struct {
client proto.PiCamClient
}
func (c *piCamGrpc) Open(ctx context.Context) error {
_, err := c.client.Open(ctx, &proto.Void{})
return err
}
func (c *piCamGrpc) Close(ctx context.Context) error {
_, err := c.client.Close(ctx, &proto.Void{})
return err
}
func (c *piCamGrpc) GetFrame(ctx context.Context) ([]byte, error) {
return getFrame(ctx, c)
}
func (c *piCamGrpc) GetFrames(ctx context.Context, byteCh chan<- []byte, errCh chan<- error) (<-chan struct{}, error) {
stream, err := c.client.GetFrames(ctx, &proto.Void{})
if err != nil {
return nil, fmt.Errorf("unable to get frame stream: %v", err)
}
ctx, _ = joincontext.Join(ctx, stream.Context())
go func() {
defer close(byteCh)
defer close(errCh)
for {
if ctx.Err() != nil {
// Context canceled
return
}
res, err := stream.Recv()
if err == io.EOF {
// End of stream
return
}
if err != nil {
// If some other error
errCh <- err
continue
}
// Send image to byte channel
byteCh <- res.ImageBytes
}
}()
return ctx.Done(), nil
}