#!/bin/sh
# $FreeBSD: head/multimedia/webcamd/files/webcamd.in 372594 2014-11-15 11:28:29Z nox $
#
# PROVIDE: webcamd
# REQUIRE: FILESYSTEMS netif dbus
# BEFORE: devd
# KEYWORD: shutdown
#
# ================================================================
# Webcamd is enabled by adding the following line to /etc/rc.conf:
# ================================================================
#
# webcamd_enable="YES"
#
# ================================================================
# By default webcamd instances are invoked by the devd(8) system
# daemon and you do not normally need to do any extra configuration
# just restart the devd service. If the devd service is not enabled,
# you need to add instances of "webcamd_N_flags=" which contain at
# least one of the "-d", "-D", "-N", or "-S" options.
# ================================================================
#
# webcamd_0_flags="<instance 0 flags>"
# webcamd_1_flags="<instance 1 flags>"
# etc ...
#
# ================================================================
# Specify which USB device to start with the "-N" and "-S" options.
# For example, if "webcamd -l" shows this device in device list:
# webcamd [-d ugen7.2] -N SCEH-0036-SONY -S ALR001DN4J -M 0
# 
# Then it can be set in your rc.conf file:
# webcamd_0_flags="-N SCEH-0036-SONY -S ALR001DN4J"
# 
# ================================================================
# You can add extra instances with webcamd_N_flags, where "N" is a
# sequentially increasing number starting from "0".
# ================================================================
#
# ================================================================
# General flags can be set on all webcamd instances with the variable
# "webcamd_flags" which applies globally to all instances:
# ================================================================
# webcamd_flags="-m v4l2-dev.hflip=1"
# 
# ================================================================
# If you need to start a vtuner client instance using the "-D" option,
# put the following line into your rc.conf. The "-i" option must be
# unique for every vtuner client instance, else there will be a PID
# file name conflict.
# ================================================================
# webcamd_2_flags="-D 127.0.0.1:5100:-1 -i 0"
# ================================================================
# 
# ================================================================
# If you have multiple identical devices of the same model number,
# then you should specify the unique serial number for each instance
# the recommended way with "-N" and "-S" options.
#
# However some USB devices may not have a unique serial number. So if
# "-S" output is blank or always the same then serial number is no
# good. You should instead use "-N" and the "-M" index option.
# 
# ================================================================
# If you are using a remote control you might need to force the
# protocol by setting the "rc-main.default_protocol" parameter to
# "lirc" for example. Run webcamd -s to get a description of available
# protocols.
# ================================================================
#
# webcamd_flags="-m rc-main.default_protocol=lirc"
# webcamd_N_flags="-m rc-main.default_protocol=lirc"
#
# ================================================================
# Additional Webcamd flags:
# ================================================================
#
# webcamd_startup_delay=<seconds>
# webcamd_user=<the user to run webcamd as>
# webcamd_group=<the group to run webcamd as>
# webcamd_devd_starts_unspecified=<YES/NO>
#

. /etc/rc.subr

name=webcamd
rcvar=webcamd_enable
load_rc_config $name

: ${webcamd_enable:=NO}
: ${webcamd_user:=webcamd}
: ${webcamd_group:=webcamd}
: ${webcamd_startup_delay=1}
: ${webcamd_devd_starts_unspecified=YES}

: ${hald_enable:=NO}

# If invoked automatically by devd, we receive additional arguments
devd_device=${2}
devd_interface=${3-0}

command=webcamd
command_args="-B -U ${webcamd_user} -G ${webcamd_group}"

start_cmd="${name}_start"
stop_cmd="${name}_stop"
status_cmd="${name}_status"

webcamd()
{
  # When running early we need to pre-load some libraries
  env LD_PRELOAD=%%LIBHAL%%%%LIBCUSE%% %%PREFIX%%/sbin/webcamd $*
}

webcamd_pids()
{
  pids=$(pgrep -d ' ' $name)
  pids=${pids% }
  printf "${pids}"
}

webcamd_grep_instance_flags()
{
    echo "$instance_flags" | grep -oE -- "(^| |	)($1)"
    exit 0
}

webcamd_start_devd()
{
  # Start a single USB device, as this rc.d script was invoked by devd
  # with extra arguments

  n=0
  while true
  do
    instance_flags=$(eval "echo \$webcamd_${n}_flags")
    n=$(expr $n + 1)
    if [ ! "$instance_flags" ]; then
      instance_flags="-d ${devd_device}"
      break
    fi

    # ignore instance entries which are for "-D" vtuner client
    if [ "$(webcamd_grep_instance_flags '-D')" ]; then
      continue
    fi

    # skip flags if no "-d" option is present
    if [ ! "$(webcamd_grep_instance_flags '-d')" ]; then
      continue
    fi

    # skip if the "-d" option does not match
    if [ ! "$(webcamd_grep_instance_flags '-d[ 	]*[[:alpha:]]*'${devd_device#ugen})" ]; then
      continue
    fi

    # we got a match
    break
  done

  if checkyesno webcamd_devd_starts_unspecified; then
    # Try to start the connected USB device
    ${command} -i ${devd_interface} ${instance_flags} ${webcamd_flags} ${command_args}
  fi
}

webcamd_start()
{
  # Check if we should attach to the "hald" service
  if checkyesno hald_enable ; then
    command_args="$command_args -H"
  fi

  # If this rc.d script was invoked by devd
  if [ "$devd_device" ]; then
    # Then start the device ugenX.X, as provied in the argv $2, $3
    webcamd_start_devd
  else
    # Start specified instances
    webcamd_start_instances
  fi
}

webcamd_start_instances()
{
  # Start instances that were specified by $webcamd_N_flags
  echo "Starting ${name}."

  n=0
  instance_flags=$(eval "echo \$webcamd_${n}_flags")
  while true
  do
    n=$(expr $n + 1)
    if [ ! "$instance_flags" ]; then
        break
    fi

    # check if valid flags are present
    if [ ! "$(webcamd_grep_instance_flags '-d|-D|-N|-S')" ]; then
      continue
    fi

    # launch an instance of webcamd for this configuration entry
    ${command} ${instance_flags} ${webcamd_flags} ${command_args}

    # next instance flags
    instance_flags=$(eval "echo \$webcamd_${n}_flags")

    if [ "$instance_flags" ]; then
      # wait a bit before invoking next instance
      sleep "$webcamd_startup_delay"
    fi
  done
}

webcamd_stop()
{
  pids=$(webcamd_pids)
  if [ "${pids}" ]; then
    echo "Stopping ${name}."
    echo "Waiting for PIDs: ${pids}"
    for signal in TERM INT QUIT KILL HUP
    do
      kill -s ${signal} ${pids}
      sleep 1
      pids=$(webcamd_pids)
      [ "${pids}" ] || break
    done
  else
    echo "${name} is not running."
    return 1
  fi
}

webcamd_status()
{
  pids=$(webcamd_pids)

  if [ "${pids}" ]; then
    echo "${name} is running as pid ${pids}."
  else
    echo "${name} is not running."
    return 1
  fi
}

run_rc_command "$1"