Roku Hd1000 - photobridge - digital av player User manual

Roku External Control Protocol

for the HD1000

Revision 1.5 | November 23, 2003

For custom installers, developers, and technical users

Roku External Control Protocol for the HD1000 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Roku wants your feedback! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

ECP basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

ECP command syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

About Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Script File Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

An example ECP script. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

ECP status feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Running a script from the Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Appendix A: A longer script example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Appendix B: Image Viewer (“Photo”) ECP commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table B1: Commands valid in both modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table B2: Commands valid in Slideshow mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table B3: Commands valid in manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Appendix C: Music player (“Listen”) ECP commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table C1: Commands for Listen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Appendix D: Background music player (“mp3player”) ECP commands . . . . . . . . . . . . . . . . . . . . . . . 15

Table D1: Commands for mp3player. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Appendix E: System ECP Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table E1: Commands for the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table of Contents

in the United States and other countries.

Roku External Control Protocol for the HD1000 1

Introduction

The features of the Roku™ HD1000 can be controlled externally (“scripted”) via a protocol

called the External Control Protocol (ECP).

HD1000 users and third-party developers can use the ECP to control HD1000 applications (and

other applications implementing the Roku ECP APIs). This document covers the basics of using

the ECP. The appendices in this document contain a complex sample script and a complete

listing of the ECP commands supported by the HD1000’s built-in applications. For purposes of

this document, the image viewer will be used as the primary example.

Roku wants your feedback!

The ECP commands are provided to make life easier for third parties. If you have suggestions

for enhancements or additions to ECP support on the HD1000 (or if you find an error in this

document), please don’t hesitate to write to us at support@rokulabs.com. Requests will be

considered for inclusion in later software releases.

ECP basics

ECP commands are issued from the shell by way of a helper program called (appropriately)

“ecp.” There are three basic ways to issue these commands:

1. The commands may be grouped together in a standard Linux shell script. This is the

most convenient way to issue a sequence of commands that you may want to repeat

multiple times. Shell scripts may be stored on any media source accessible to the

HD1000, including the built-in storage, a flash card, or a shared folder on a networked

computer.

2. The commands may be issued at the command prompt, via the serial port. Connecting

a computer to the HD1000’s serial port with a standard serial cable gives you a Linux

command shell, at which ECP commands may be entered. (The port is 9600bps, 8-N-1,

no flow control.)

3. If the HD1000 is on a network, the commands may be issued at the command prompt,

via a telnet connection. Simply use a telnet program on a networked computer to

connect as “guest” with no password. The IP address of the HD1000 can be found at

the top of the screen in the Setup feature.

Note: In order for an ECP command to be successfully processed, the program that handles

the command must first be running. For example, in order for the command ‘photoApp’ to be

processed, the program “photo” must be running.

Additionally, third-party developers may also issue ECP commands directly from within

their applications via the CascadeInput::DispatchECPCommand API. See the developer

documentation for more information.

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ECP command syntax

The syntax for ecp is as follows:

ecp <app identifier> <command> [optional arguments]

For example:

ecp photoApp IMAGEDIR “/tmp/Volumes/CompactFlash”

ecp photoApp DISPLAY_IMAGE “/tmp/Volumes/CompactFlash/myphoto.jpg”

ecp photoApp QUIT

About Paths

The various media sources available to the HD1000 appear in /mnt where flash0 is the built-

in storage, flash1 is Compact Flash, flash2 is SD/MMC, flash3 is Memory Stick and flash4 is

SmartMedia. Mounted network shares can be found in /mnt/smb/.

For your convenience, all currently-mounted media sources can be found with better names

in /tmp/Volumes . For readability, this is how media sources these scripts below will refer to

media sources, with a few exceptions.

Script File Formats

Scripts are simply text files. However, the format of the files is slightly different than that to

which most Windows users may be used. Scripts must be saved with unix-style line endings. If

you use Linux to edit your script files, the format will be correct. However, if you use Windows

or MacOS to edit your script files, the format of the files may be incorrect, resulting in the

HD1000 being unable to execute the files. There are text-editors available for Windows that

are able to save text files with Unix-style line endings. Among these is “TextPad”. There is a

command-line utility called “dos2unix” that will convert files from Windows line endings to

Unix line endings.

An example ECP script

The following brief example script is a trivial playlist, using the faceless music player to provide

background music for a four-image slideshow. A longer, more complex example appears in

the Appendix of this document, and is available for download from the Roku web site.

#!/bin/sh

# Launch the Photo app in "playlist" mode.

# Be sure to launch in background (with &), or the

# script will not continue past this line!

photo –p &

# Wait a bit to make sure Photo has launched.

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sleep 2

# Launch the music player (also in the background)

# --obeyphoto means that it will quit when Photo does

mp3player --obeyphoto "/tmp/Volumes/CompactFlash/"*.mp3 &

# Play the images I like

# Using quotes around the path is a good habit,

# because paths with spaces must have quotes.

ecp photoApp IMAGEDIR "/tmp/Volumes/CompactFlash"

ecp photoApp DISPLAY_IMAGE "/tmp/Volumes/CompactFlash/Image1.jpg"

sleep 9

ecp photoApp DISPLAY_IMAGE "/tmp/Volumes/CompactFlash/Image3.jpg"

sleep 9

ecp photoApp DISPLAY_IMAGE "/tmp/Volumes/CompactFlash/Image5.jpg"

sleep 9

ecp photoApp DISPLAY_IMAGE "/tmp/Volumes/CompactFlash/Image9.jpg"

sleep 9

# All done. Quit Photo (which will tell the

# music player to quit).

ecp photoApp QUIT

ECP status feedback

Applications provide feedback on command success or failure via text status messages.

$ ecp photoApp IMAGEDIR "/tmp/Volumes/CompactFlash"

photoApp: invalid path

$ ecp photoApp IMAGEDIR "/tmp/Volumes/CompactFlash"

photoApp: ok

$ ecp fakecommand

fakecommand: unknown ecp command

In the case of the last command, the result “unknown ecp command” indicates one of the

following:

• The program that handles the specified command is not running. In the case of

photoApp, it means that “photo” is not running.

• The command was mis-typed. Check your spelling

• The command is an invalid command.

These status messages can be useful when initially authoring and testing a script. Scripts can

also check the status messages of commands that may fail to be sure that they should continue

to run:

#!/bin/sh

# Adding /usr/local/bin to the path allows the script

# to call “photo” and “ecp” instead of

# “/usr/local/bin/photo” and “/usr/local/bin/ecp”

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PATH=$PATH:/usr/local/bin

# Launch the Photo app in "playlist" mode (which opens

# no windows and just waits for ECP commands).

# Be sure to launch in background (with &), or the

# script will not continue past this line!

photo –p &

# Wait a bit to make sure Photo has launched.

sleep 2

# Set the image directory, making sure it’s valid.

ecp photoApp IMAGEDIR "/tmp/Volumes/CompactFlash" | \

grep 'photoApp: ok'

# This line tests whether grep returned 0 (meaning

# that the reply string contained "photoApp: ok")

if [ $? -eq 0 ]

then

ecp photoApp SLIDESHOW "/tmp/Volumes/CompactFlash"

else

echo "failed to set directory"

ecp photoApp QUIT

Consult a reference on Linux shell scripting for details on the syntax of shell scripts.

Running a script from the Main Menu

It’s easy to make a script you’ve written appear in the main menu. Just name your script file

with a “.roku” extension, like “MySlideshow.roku”. Put the file onto a flash card or in the shared

folder on your computer that you connect to from your HD1000. You will see a button in the

“Roku Applications” section of the Main Menu corresponding to your new script.

Note: The file must be marked executable. On most flash cards and file servers, this is

automatic. Consult your favorite Linux reference for details if you're not certain.

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Appendix A: A longer script example

#!/bin/sh

# This script shows a set of images from the Memory

# Stick and SD/MMC cards, while playing music from the

# Compact Flash. It shows off some of the image viewer’s

# features, like pan and zoom and information display.

# Adding /usr/local/bin to the path allows the script

# to call “photo” and “ecp” instead of

# “/usr/local/bin/photo” and “/usr/local/bin/ecp”

PATH=$PATH:/usr/local/bin

echo "launching"

# Launch the image viewer, and give it a couple of

# seconds to start up. We re-direct any output from

# Photo to /dev/null so as not to clutter up the

# terminal. You would normally do this with each of

# the ECP lines as well, but it has been omitted for

# readability.

photo -p > /dev/null 2>&1 &

sleep 2

# Set the image directory. Photo requires a valid

# directory to be set in case the user starts

# punching buttons on the remote.

ecp photoApp IMAGEDIR “/tmp/Volumes/Memory Stick” | \

grep “photoApp: ok”

if [ $? –ne 0 ]

echo “setting the image directory failed”

exit 1

# display the first image

ecp photoApp DISPLAY_IMAGE “/mnt/flash3/racecar.jpg”

# For this slideshow, we won’t display any info. If

# it was on be default, dismiss it immediately

ecp photoApp SHOW_INFO none

# Start the music

mp3player “/tmp/Volumes/CompactFlash/”*.mp3 > /dev/null 2>&1 &

# Start Photo fetching the next image in the background,

# so displaying it will be quick

ecp photoApp PREFETCH_IMAGE “/mnt/flash3/F16_hires.jpg”

# Turn off info display for all images (we

# do this here because the first command besides the

# directory causes Photo to open the image display

# window, which paints the screen black – waiting until

# the first image has been displayed eliminates the

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# black screen).

ecp photoApp INFO_MODE none

# Set the image fit mode to smart

ecp photoApp FIT_MODE smart

# Go ahead and display the image we've started fetching

ecp photoApp DISPLAY_IMAGE "/mnt/flash3/F16_hires.jpg"

# Start the next image fetching, then wait 7 seconds

# before displaying it

ecp photoApp PREFETCH_IMAGE "/mnt/flash3/F15_hires.jpg"

ecp photoApp DISPLAY_IMAGE "/mnt/flash3/F15_hires.jpg"

# Next image – start it fetching

ecp photoApp PREFETCH_IMAGE "/mnt/flash3/F22.jpg"

# After the F-15 has been up for five seconds, show off

# Photo's zoom and pan features

sleep 5

ecp photoApp ZOOM_IN

# pan to the left

sleep 2

ecp photoApp PAN_LEFT

# pan to the right

ecp photoApp PAN_RIGHT

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# zoom back out

ecp photoApp ZOOM_OUT

sleep 5

# display the pre-fetched image

ecp photoApp DISPLAY_IMAGE "/mnt/flash3/F22.jpg"

sleep 3

# show off Photo's info display modes

ecp photoApp SHOW_INFO short

sleep 2

ecp photoApp SHOW_INFO long

sleep 6

ecp photoApp SHOW_INFO none

sleep 1

# Okay, enough picture-by-picture manual control. Time

# to let Photo do the work. Start a slideshow with all

# the images on the SD/MMC card.

ecp photoApp SLIDESHOW "/mnt/flash2"

ecp photoApp FIT_MODE smart

ecp photoApp INFO_MODE none

# Let the slideshow run for a minute and a half, and

# then we're done.

sleep 90

ecp photoApp QUIT

ecp mp3player QUIT

sleep 2

echo "done"

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Appendix B: Image Viewer (“Photo”) ECP commands

The image viewer appication (“Photo”) supports a number of ECP commands. Some are

simple commands, and others take arguments.

Photo will accept ECP commands at any time. However, if you wish to manually “drive” the

application from ECP commands entirely, you may launch Photo with the -p command-line

switch. This puts Photo into “playlist” mode, where it does not open any initial windows, start

any threaded decoding or display any images:

$ photo –p &

In the present implementation, some ECP commands are not really appropriate in all modes,

and some may produce unwanted results.

Specifically, you can think of the app as having two “modes” – a slideshow mode and a

completely manual mode. (This is not strictly accurate, but it’s the easiest way to explain the

behavior. The application is actually modeless, but there is state and some of the commands

modify state while some do not.)

In the slideshow mode, ECP commands which duplicate the functionality of the remote’s

buttons are available (zoom, pan, next, prev, play, pause, info) and work as expected.

Slideshow mode is entered by issuing the SLIDESHOW command.

In the completely manual mode, the ECP program sending the commands is responsible

for sending the commands to pre-fetch images and display them (although straight display

commands do work, they’re slower). In this mode, many of the “normal” features work as

expected (zoom, pan, info). However, because Photo was designed to work with a list of files

in a directory, some commands produce unusual results. Specifically, the NEXT_IMAGE and

PREV_IMAGE commands are relative to the current index in the directory initially set with

IMAGEDIR. The DISPLAY_IMAGE and PREFETCH_IMAGE commands do not update the position

in this list, even if the files in question are in the list. Also ROTATE_IMAGE will rotate the image

which is at the current list index – almost certainly not the image currently displayed. The

tables that follow break the ECP commands down into commands which work for slideshow,

commands that work in manual mode, and commands that are valid in both.

The completely manual mode is the default mode when Photo is launched with -p. It can

also be entered at any time during a slideshow by simply issuing a PAUSE command and then

issuing PREFETCH_IMAGE or DISPLAY_IMAGE commands.

Note that Photo’s normal button and infrared handling is always active. If your application

desires to completely control Photo while locking out keys, it should open an always-on-top

window and SetFocus() on that window after launching Photo. This window should trap all keys.

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Table B1: Commands valid in both modes

Command Arguments Description

IMAGEDIR <full path> Sets the working

image directory.

This must be

set before any

commands other

than SLIDESHOW are

valid.

SLIDESHOW <full path> Launch a slideshow

on the specied

path. Settings

from preferences

are used.

ROTATE_IMAGE <none> Exactly like

pressing the rotate

key on the remote

ZOOM_IN <none> Exactly like

pressing the Zoom

In key on the

remote

ZOOM_OUT <none> Exactly like

pressing the Zoom

Out key on the

remote

PAN_LEFT <none> Exactly like

pressing the left

arrow on the remote

PAN_RIGHT <none> Exactly like

pressing the right

arrow on the remote

PAN_UP <none> Exactly like

pressing the up

arrow on the remote

PAN_DOWN <none> Exactly like

pressing the down

arrow on the remote

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SET_ZOOM_AND_PAN Takes three

arguments: zoom,

X pan and Y pan.

They must be given

IN THAT ORDER if

they are provided,

but all three

are not required.

Command should look

like “SET_ZOOM_AND_

PAN zoom=0.5 panX=-

75 panY=85”. Note

no spaces between

label and argument,

with a single space

between arguments.

Sets the absolute

pan and zoom for

the current image.

The X pan values

are constrained

to values valid

for the hardware

scaler. Pan

coordinates are

given in terms

of the original

decoded image, and

refer to the center

point. Thus, the

pan coordinates

given at left pan

the image so that

its center is

75 source pixels

left of the screen

center and 85

source pixels down

from the screen

center. Zoom is

a oating-point

number that can

be thought of

as magnication

(1.0 is “actual

size”, 2.0 is

“double size”).

Again, these

are constrained

to valid values

for the hardware

scaler.

[Limitation: if the

image is too large

to t into the

hardware scaler,

it is scaled to t.

In this case, all

of the parameters

listed here are

scaled as well.]

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SHOW_INFO “short”, “long” or

“none”

Display the info

for this image (or

dismiss if “none”

specied)

INFO_MODE “short”, “long” or

“none”

Set the info mode

for each subsequent

image

FIT_MODE “t”, “ll” or

“smart”

Set the t mode

for each subsequent

image

SET_DELAY A number in

milliseconds.

Numbers less than

15 are invalid.

Sets the inter-

image delay for a

slideshow

QUIT <none> Quit the app

Table B2: Commands valid in Slideshow mode

Command Arguments Description

PAUSE <none> Pause a slideshow.

Not a toggle.

PLAY <none> Resume/start a

slideshow. Not a

toggle.

NEXT_IMAGE <none> Exactly like

pressing the >>|

key on the remote

PREV_IMAGE <none> Exactly like

pressing the |<<

key on the remote

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Table B3: Commands valid in manual mode

Command Arguments Description

PREFETCH_IMAGE <full path> Launches a

background thread

to decode the

specied image.

Follow this command

with DISPLAY_IMAGE

several seconds

later.

DISPLAY_IMAGE <full path>

-or-

zoom=<value>

panX=<value> panY =

<value>

(Spaces between

each label/value

pair, no spaces

allowed between

label, equals sign,

and value).

Fetch and display

an image. If you

call PREFETCH_IMAGE

rst and allow time

for the fetch to

complete, then this

command executes

immediately.

Status return

blocks until the

image has actually

displayed.

If the optional

zoom and pan

arguments are

supplied, the image

is displayed zoomed

and panned. See

SET_ZOOM_AND_PAN

above.

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Appendix C: Music player (“Listen”) ECP commands

There are two music playing applications on the HD1000, release 1.0. The first is called “Listen”,

and it is the GUI player you normally launch from the Main Menu. The second is called

“mp3player”, and is a faceless background application used by Art Packs or other tasks where

music is meant to accompany some other display.

The table below shows commands valid for the Listen app. From the shell, the syntax to invoke

these commands is:

ecp ListenApp <command> [<arguments>]

Unlike Photo, the command is not case-sensitive.

Table C1: Commands for Listen

QUIT <none> Stops music

playback and quits

the application

NEXT <none> Advances to

the next track.

Equivalent to the

>>| button on the

remote

PREVIOUS <none> If less than

4 seconds have

elapsed in the

current track,

plays the previous

track. Otherwise,

starts the current

track over from the

beginning.

PLAY <none> If paused, resumes

playback of the

current track. If

not playing or

paused, plays the

track highlighted

in the GUI.

PAUSE <none> Pauses the current

track.

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PlaybackPosition <none> Returns a string

indicating how

many seconds have

elapsed in the

currently playing

track.

CurrentFile <none> Returns the lename

of the currently

playing track.

CurrentTitle <none> Prints out the

ID3-title of the

currently playing

track.

CurrentAlbum <none> Prints out the

ID3-album of the

currently playing

track.

CurrentArtist <none> Prints out the

ID3-artist of the

currently playing

track.

CurrentYear <none> Prints out the

ID3-year of the

currently playing

track.

SetDirectory <full path> Set the currently

viewable-browseable

directory to

<full path>, if it

exists.

FilePlay <lename> Plays <lename>

if it is in the

currently viewed

list of les.

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Appendix D: Background music player (“mp3player”)

ECP commands

The next table (below) shows commands valid for the mp3player app. From the shell, the

syntax to invoke these commands is:

ecp mp3player <command> [<arguments>]

Like Listen, the command is not case-sensitive.

Note: The mp3player application, having no GUI, takes as an argument when it is launched one

or more .mp3 files to play. These files are placed in an internal list. If playback reaches the end

of the list, it will start again from the beginning. There are ECP commands for manipulating

the list.

Table D1: Commands for mp3player

QUIT <none> Stops music

playback and quits

the application.

RESUME <none> If paused, resume

playback.

PAUSE <none> If playing, pause

playback

NEXT <none> Play the next le

in the list.

PREVIOUS <none> Plays the previous

le.

APPEND <full path> Appends the music

le at <full path>

to the end of the

list of les to be

played.

INSERT <full path> Inserts the music

le at <full path>

after the currently

playing le in the

list.

Roku External Control Protocol for the HD1000 16

Appendix E: System ECP Commands

The table below listen commands that affect the HD1000 as a whole. From the shell, the syntax

to invoke these commands is:

ecp system <command> [<arguments>]

The command is not case-sensitive.

Table E1: Commands for the system

POWER “ON” , “STANDBY” or

“QUERY”

Sets the power-on state

of the system. A argument

of “On” turns the system

on. “Standby” puts

the system into standby

mode. “Query” returns

whether the unit is on or

in standby. If the unit

is already in the state

requested, the command

will have no effect.

VIDEOMODE A valid combination

of one of

[composite, svideo,

component, rgb] and

[480i, 480p, 720p,

768p, 1080i]

If the pair of settings

(connector and output

mode) is valid, sets

the output to that

mode, otherwise returns

an error. “RESET” is a

special case that sets the

unit into initial video

settings mode.

SENDKEY Any of: MENU,

POWER, EXIT, NORTH,

SOUTH, EAST, WEST,

SELECT, PREVIOUS,

NEXT, PLAYPAUSE,

ROTATE, INFO,

ZOOM_IN, ZOOM_OUT

Simulates a remote

control keypress of the

corresponding button.

VERSION <none> Prints out the rmware

version

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