mirror of https://bitbucket.org/ausocean/av.git
139 lines
3.2 KiB
Go
139 lines
3.2 KiB
Go
// +build !test
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/*
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DESCRIPTION
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release.go provides implementations for the Raspistill struct for release
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conditions, i.e. we're running on a raspberry pi with access to the actual
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raspistill utility with a pi camera connected. The code here runs a raspistill
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background process and reads captured images from the camera.
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AUTHORS
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Saxon Nelson-Milton <saxon@ausocean.org>
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LICENSE
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Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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in gpl.txt. If not, see http://www.gnu.org/licenses.
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*/
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package raspistill
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import (
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"errors"
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"fmt"
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"io"
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"bufio"
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"os/exec"
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"strings"
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"bitbucket.org/ausocean/av/revid/config"
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)
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type raspistill struct {
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cfg config.Config
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cmd *exec.Cmd
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out io.ReadCloser
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log config.Logger
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done chan struct{}
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isRunning bool
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}
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func new(l config.Logger) raspistill {
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return raspistill{
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log: l,
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done: make(chan struct{}),
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}
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}
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func (r *Raspistill) stop() error {
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if r.isRunning == false {
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return nil
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}
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close(r.done)
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if r.cmd == nil || r.cmd.Process == nil {
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return errors.New("raspistill process was never started")
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}
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err := r.cmd.Process.Kill()
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if err != nil {
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return fmt.Errorf("could not kill raspistill process: %w", err)
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}
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r.isRunning = false
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return r.out.Close()
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}
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func (r *Raspistill) start() error {
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args := []string{
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"--output", "-",
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"--nopreview",
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"--width", fmt.Sprint(r.cfg.Width),
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"--height", fmt.Sprint(r.cfg.Height),
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"--rotation", fmt.Sprint(r.cfg.Rotation),
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"--timeout", fmt.Sprint(r.cfg.TimelapseDuration),
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"--timelapse", fmt.Sprint(r.cfg.TimelapseInterval),
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"--quality", fmt.Sprint(r.cfg.JPEGQuality),
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}
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r.log.Info(pkg+"raspistill args", "args", strings.Join(args, " "))
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r.cmd = exec.Command("raspistill", args...)
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var err error
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r.out, err = r.cmd.StdoutPipe()
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if err != nil {
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return fmt.Errorf("could not pipe command output: %w", err)
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}
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stderr, err := r.cmd.StderrPipe()
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if err != nil {
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return fmt.Errorf("could not pipe command error: %w", err)
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}
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go func() {
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errScnr := bufio.NewScanner(stderr)
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for {
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select {
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case <-r.done:
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r.log.Info("raspistill.Stop() called, finished checking stderr")
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return
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default:
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}
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if errScnr.Scan() {
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r.log.Error("error line from raspistill stderr","error",errScnr.Text())
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continue
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}
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err := errScnr.Err()
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if err != nil {
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r.log.Error("error from stderr scan","error",err)
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}
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}
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}()
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err = r.cmd.Start()
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if err != nil {
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return fmt.Errorf("could not start raspistill process: %w", err)
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}
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r.isRunning = true
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return nil
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}
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func (r *Raspistill) read(p []byte) (int, error) {
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if r.out != nil {
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return r.out.Read(p)
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}
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return 0, errNotStarted
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}
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