# ODR-PadEnc ODR-PadEnc is an encoder for Programme Associated Data (PAD) and includes support for: - MOT Slideshow (including catSLS), according to ETSI EN 301 234 and TS 101 499 - DLS (including DL Plus), according to ETSI EN 300 401 and TS 102 980 To encode DLS and Slideshow data, the `odr-padenc` tool reads images from a folder and DLS text from a file, and generates the PAD data for the encoder. For detailed usage, see the usage screen of the tool with the `-h` option. More information is available on the [Opendigitalradio wiki](http://wiki.opendigitalradio.org/ODR-PadEnc) # Installation You have 3 ways to install odr-padenc on your host: ## Using binary debian packages If your host is running a debian-based OS on amd64, arm64 or arm/v7, then you can install this tool using the standard debian packaging system: 1. Update the debian apt repository list: ``` # Replace bullseye (debian-11) with bookworm (debian-12) if applicable curl -fsSL http://debian.opendigitalradio.org/opendigitalradio-bullseye.sources > /etc/apt/sources.list.d/opendigitalradio-bullseye.sources curl -fsSL http://debian.opendigitalradio.org/opendigitalradio.asc | gpg --dearmor > /etc/apt/trusted.gpg.d/opendigitalradio.gpg ``` 1. Refresh the debian packages list: ``` apt update ``` 1. Install the debian package: ``` apt install --yes odr-padenc ``` ## Using the dab-scripts You can compile odr-padenc as well as the other main components of the mmbTools set with an installation script: 1. Clone the dab-scripts repository: ``` git clone https://github.com/opendigitalradio/dab-scripts.git ``` 1. Follow the [instructions](https://github.com/Opendigitalradio/dab-scripts/tree/master/install) ## Compiling manually Unlike the 2 previous options, this one allows you to compile odr-padenc with the features you really need. ### Requirements For Debian Bullseye-based OS, run the following commands: ``` # Required packages ## C++11 compiler sudo apt-get install --yes build-essential automake libtool # optional package ## ImageMagick MagickWand (optional, for MOT Slideshow), version 6 (legacy) or 7 sudo apt-get install libmagickwand-dev ``` ### Compilation 1. Clone this repository: ``` # stable version: git clone https://github.com/Opendigitalradio/ODR-PadEnc.git # or development version (at your own risk): git clone https://github.com/Opendigitalradio/ODR-PadEnc.git -b next ``` 1. Configure the project ``` cd ODR-PadEnc ./bootstrap ./configure ``` 1. Compile and install: ``` make sudo make install ``` ### ImageMagick and Debian Jessie/Ubuntu 16.04 Please note that Debian Jessie and Ubuntu 16.04 shipped a version of ImageMagick that was affected by two memory leaks (see #2, and also Ubuntu's [#1671630](https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1671630) and [#1680543](https://bugs.launchpad.net/debian/+source/imagemagick/+bug/1680543)). Hence ODR-PadEnc increasingly consumed memory until it crashed. This has been fixed with the following package versions: - Debian Jessie: 8:6.8.9.9-5+deb8u9 - Ubuntu 16.04: 8:6.8.9.9-7ubuntu5.7 # Usage of MOT Slideshow and DLS ## Basic example `odr-padenc` reads images from the specified folder, and generates the PAD data for the encoder. This is communicated through a socket to the encoder. It also reads DLS from a file, and includes this information in the PAD. PAD length is specified in the audio encoder and must not be set on the `odr-padenc` command line. Basic example with both DLS taken from the file *dls.txt* and MOT Slideshow carousel with slides from the *slides* folder. This assumes the common identifier between audio encoder and ODR-PadEnc is defined in the *IDENTIFIER* environment variable. odr-padenc -o $IDENTIFIER -t dls.txt -d ./slides If you generate slides on-the-fly (e.g. content-related slides with album covers), set the `--erase` flag to ensure a slide is only transmitted once, and set `--sleep=0` to start slide transmission as soon as the file is created. ## If ImageMagick is available It can read all file formats supported by ImageMagick, and by default resizes them to 320x240 pixels, and compresses them as JPEG. If the input file is already a JPEG file of the correct size, and smaller than 50kB, it is sent without further compression. If the input file is a PNG that satisfies the same criteria, it is transmitted as PNG without any recompression. ## RAW Format If ImageMagick is not compiled in, or when enabled with the `-R` option, the images are not modified, and are transmitted as-is. Use this if you can guarantee that the generated files are smaller than 50kB and not larger than 320x240 pixels. Files whose name end in `_PadEncRawMode.png` or `_PadEncRawMode.jpg` will always be transmitted in RAW mode. It may be useful to apply [`optipng`](http://optipng.sourceforge.net) to any PNG file prior to transmission. ## Supported Encoders `odr-audioenc` and `odr-sourcecompanion` can insert the PAD data from `odr-padenc` into the bitstream. This is an ongoing development. Only some PAD lengths are supported, please see `odr-padenc`'s help. ODR-PadEnc v2 is compatible with ODR-AudioEnc v2 and ODR-SourceCompanion v0.x, and uses a fifo to communicate between the tools. ODR-PadEnc v3 replaced the fifo with a socket and is compatible with ODR-AudioEnc v3 and ODR-SourceCompanion v1. ## Character Sets When `odr-padenc` is launched with the default character set options, it assumes that the DLS text in the file is encoded in UTF-8, and will convert it according to the DAB standard to the *Complete EBU Latin based repertoire* character set encoding. If you set the character set encoding to any other setting (except *Complete EBU Latin based repertoire* which needs no conversion), `odr-padenc` will abort, as it does not support any other conversion than from UTF-8 to *Complete EBU Latin based repertoire*. You can however use the `-C` option to transmit the untouched DLS text. In this case, it is your responsibility to ensure the encoding is valid. For instance, if your data is already encoded in *Complete EBU Latin based repertoire*, you must specify both `--charset=0` and `--raw-dls`. # Known Limitations Some receivers are unable to decode slides larger than some size, even within the allowed size limit given in the specification. # Thanks This encoder was initially called `mot-encoder` and has been contributed by [CSP](http://rd.csp.it).