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| Developer(s) | Till Tönshoff |
|---|---|
| Operating system | Mac OS X, Windows, Linux, Solaris |
| License | GNU General Public License |
| Website | http://sourceforge.net/projects/retrocode/ |
RetroCode is a universal mobile content converter originally created by Retro Ringtones LLC. RetroCode is able to read and write most common sample-based ringtone formats including meta-data.
RetroCode reads and writes many common mobile sample content file formats. RetroCode takes measures for making sure that meta-data is maintained and converted between the formats. It features filters for adapting audio content to the abilities of small handheld devices. RetroCode also includes a ringback-signal synthesizer allowing to mix audio content with standard ITU ringback signals.
RetroCode currently supports the following formats
| Format Name | Read / Decode | Write / Encode |
|---|---|---|
| Beatnik RMF (uncompressed) | Yes | No |
| Beatnik RMF (IMA ADPCM) | Yes | Yes |
| Beatnik RMF (MPEG) | Yes | No |
| Yamaha MA2 | Yes | Yes |
| Yamaha MA3 | Yes | Yes |
| Yamaha MA5 | Yes | Yes |
| Yamaha MA7 | Yes | Yes |
| Panasonic MFM | Yes | Yes |
| SAGEM Wave | Yes | Yes |
| Qualcomm QCELP | Yes | Yes |
| Qualcomm CMX | Yes | Yes |
| AMR NB | Yes | Yes |
| AMR WB | Yes | Yes |
| MPEG 2 Layer 1,2 and 3 | Yes | Yes |
| AAC | Yes | Yes |
| Macromedia Flash [ disambiguation needed ] | Yes | Yes |
| AIFF | Yes | No |
| 3GPP | Yes | Yes |
| MP4 | Yes | Yes |
| uLaw | Yes | Yes |
| aLaw | Yes | Yes |
| Dialogic VOX | Yes | Yes |
| OGG | Yes | Yes |
| RealMedia Audio | Yes | Yes |
| Microsoft WMA | Yes | Yes |
| Microsoft AVI | Yes | No |
| Microsoft Wave | Yes | Yes |
RetroCode depends on a variety of open source libraries as well as some ISO reference implementations.
Digital audio is a representation of sound recorded in, or converted into, digital form. In digital audio, the sound wave of the audio signal is typically encoded as numerical samples in a continuous sequence. For example, in CD audio, samples are taken 44,100 times per second, each with 16-bit resolution. Digital audio is also the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form. Following significant advances in digital audio technology during the 1970s and 1980s, it gradually replaced analog audio technology in many areas of audio engineering, record production and telecommunications in the 1990s and 2000s.
S/PDIF is a type of digital audio interface used in consumer audio equipment to output audio over relatively short distances. The signal is transmitted over either a coaxial cable using RCA or BNC connectors, or a fibre-optic cable using TOSLINK connectors. S/PDIF interconnects components in home theaters and other digital high-fidelity systems.
MPEG-1 Audio Layer II or MPEG-2 Audio Layer II is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3). While MP3 is much more popular for PC and Internet applications, MP2 remains a dominant standard for audio broadcasting.
Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate.
A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by any device alerting of an incoming call.
In telecommunications and computing, bit rate is the number of bits that are conveyed or processed per unit of time.
Direct Stream Digital (DSD) is a trademark used by Sony and Philips for their system for digitally encoding audio signals for the Super Audio CD (SACD).
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The Adaptive Multi-Rateaudio codec is an audio compression format optimized for speech coding. AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s.
Transcoding is the direct digital-to-digital conversion of one encoding to another, such as for video data files, audio files, or character encoding. This is usually done in cases where a target device does not support the format or has limited storage capacity that mandates a reduced file size, or to convert incompatible or obsolete data to a better-supported or modern format.
High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for low-bitrate applications such as streaming audio. The usage profile HE-AAC v1 uses spectral band replication (SBR) to enhance the modified discrete cosine transform (MDCT) compression efficiency in the frequency domain. The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals.
A container format or metafile is a file format that allows multiple data streams to be embedded into a single file, usually along with metadata for identifying and further detailing those streams. Notable examples of container formats include archive files and formats used for multimedia playback. Among the earliest cross-platform container formats were Distinguished Encoding Rules and the 1985 Interchange File Format.
FAAC is a software project which includes the AAC encoder FAAC and decoder FAAD2. It supports MPEG-2 AAC as well as MPEG-4 AAC. It supports several MPEG-4 Audio object types, file formats, multichannel and gapless encoding/decoding and MP4 metadata tags. The encoder and decoder is compatible with standard-compliant audio applications using one or more of these object types and facilities. It also supports Digital Radio Mondiale.
Mobile content is any type of web hypertext and information content and electronic media which is viewed or used on mobile phones, like text, sound, ringtones, graphics, flash, discount offers, mobile games, movies, and GPS navigation. As mobile phone use has grown since the mid-1990s, the usage and significance of the mobile devices in everyday technological life has grown accordingly. Owners of mobile phones can now use their devices to make photo snapshots for upload, twits, mobile calendar appointments, and mostly send and receive text messages, listen to music, watch videos, take mobile pictures and make videos, use websites to redeem coupons for purchases, view and edit office documents, get driving instructions on mobile maps and so on. The use of mobile content in various areas has grown accordingly.
Flash Video is a container file format used to deliver digital video content over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. There are two different Flash Video file formats: FLV and F4V. The audio and video data within FLV files are encoded in the same way as SWF files. The F4V file format is based on the ISO base media file format, starting with Flash Player 9 update 3. Both formats are supported in Adobe Flash Player and developed by Adobe Systems. FLV was originally developed by Macromedia. In the early 2000s, Flash Video was the de facto standard for web-based streaming video. Users include Hulu, VEVO, Yahoo! Video, metacafe, Reuters.com, and many other news providers.
Media Foundation (MF) is a COM-based multimedia framework pipeline and infrastructure platform for digital media in Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, and Windows 11. It is the intended replacement for Microsoft DirectShow, Windows Media SDK, DirectX Media Objects (DMOs) and all other so-called "legacy" multimedia APIs such as Audio Compression Manager (ACM) and Video for Windows (VfW). The existing DirectShow technology is intended to be replaced by Media Foundation step-by-step, starting with a few features. For some time there will be a co-existence of Media Foundation and DirectShow. Media Foundation will not be available for previous Windows versions, including Windows XP.
Pulse-code modulation (PCM) is a method used to digitally represent analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps. Alec Reeves, Claude Shannon, Barney Oliver and John R. Pierce are credited with its invention.
Beatnik, Inc., founded as Headspace, Inc., was a company that specialized in interactive audio technology. It was founded by musician Thomas Dolby in 1993 along with co-founder Mary Coller. It is best known for its Beatnik technology, which was used to provide sound in small file sizes on websites and later in billions of phones during the 2000s to play polyphonic ringtones, with its key clients being Nokia, Sony Ericsson, Samsung, and various other manufacturers. During its earlier years it also produced music for video games such as Cyberia and Obsidian.
