Transformer documentation: se_tpb_dtbAudioEncoder

Transformer Purpose

The purpose of this transformer is to encode WAVE files (*.wav) into MP3 file (*.mp3) in a DAISY/NISO 2005 or Daisy 2.02 DTB.

Input Requirements

A DAISY/NISO 2005 or Daisy 2.02 fileset.

Output

On success

A DAISY/NISO 2005 or Daisy 2.02 fileset, with all WAVE files converted into MP3.

On error

On error, this transformer will throw an exception and abort execution.

Configuration/Customization

Parameters (tdf)

manifest

Path to a Daisy 2.02 (ncc.html) or DAISY/NISO 2005 (.opf) manifest file.

outDir

The output directory.

bitrate

The bitrate of the encoded files. (default 32 kbit/s)

stereo

The stereo mode of the encoded files. (default mono)

freq

The sample rate of the encoded files. (default 22050 Hz)

filesetType

Specifies the type of the input fileset. (default Daisy 2.02)

Further development

This transformer could be extended to support multiple input and output audio formats. The possibility to select a target fileset size instead of bitrate and frequency configuration is another possible further development.

Dependencies

This transformer uses LAME for MP3 encoding. Refer to the LAME installation instructions for information on how to install and configure LAME.

Author

Linus Ericson, TPB

Licensing

LGPL