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Wednesday, December 30, 2009

Rockbox... wikipedia

Development

The Rockbox project began in late 2001 and was first implemented on the early Archos series of hard-disk based MP3 players and player/recorders, including the flash-only model Ondio, because of owner frustration with severe limitations in the manufacturer-supplied user interface and device operations. These devices have relatively weak main CPUs and instead offload music playback to dedicated hardware MP3 decoding chips (called the MAS). Rockbox, therefore, was unable to significantly alter playback capabilities. Instead, it offered a greatly improved user interface and added plugin functionality not present in the factory firmware. Rockbox is capable of being permanently flashed into flash memory on the Archos devices, making it a literal firmware replacement.
Versions of Rockbox have since been produced for more sophisticated devices. These perform audio decoding in software, allowing Rockbox to potentially support many more music formats than the original firmware as well as bringing the extensibility and increased functionality already present in the Archos ports. Rockbox is run from the hard disk on these devices, after being started with a custom bootloader, so to upgrade Rockbox users need only copy the files onto the player's drive and restart the device. Reflashing is only necessary when changing the bootloader, and on some platforms, is not required at all.
The first of these ports, beginning in late 2004, was for the ColdFire-powered devices manufactured by iriver, focusing on the H1xx series of hard drive players (H110/H120/H140). Approximately one year later a port for the H3xx series became functional, offering similar functionality.
In late 2005, work began on a port of Rockbox to Apple iPod portable players. Throughout 2006, Rockbox ports were made available for a variety of iPod models (iPod photo, iPod nano, iPod 4g, iPod mini, and iPod Video), as well as the Cowon iAUDIO X5 series. As of February 2007, usable ports are also available for the iriver H10 and Toshiba Gigabeat F & X series. As of March 5th, 2007, a new port for the Cowon iAUDIO M5 became functional. On March 11th, 2007, the SanDisk Sansa e200 series became the next addition to the Rockbox lineup. On May 23rd, 2007, support for the iPod video 80 GB model was added, completing the iPod video lineup. On July 27, 2007, initial support was added for the iPod 1G and 2G. On September 23, 2007, the Sansa c200 series was welcomed into the lineup. On March 18th, 2008, the Olympus m:robe 100 became the first new port of 2008, and the iAUDIO M3 joined the lineup days later. Rockbox now includes video-support for MPEG playback through the included work-in-progress mpegplayer plugin.[1]
To date, all Rockbox ports have been accomplished by reverse engineering with little or no manufacturer assistance. However, as free software, many Rockbox developers and supporters hope to eventually see official manufacturer support for new ports, or at least unofficial assistance in porting Rockbox to new devices. To date, only a few companies have expressed interest in Rockbox, and none have officially contributed code to the project or included it with their hardware. The Sansa port is the first to be started at the request of the hardware manufacturer who gave the Rockbox team samples of their devices.
Rockbox is continuously developed, with new SVN builds being released after every source change, and stable releases every 4 months for targets deemed sufficiently mature. Additionally builds are often available to developers of unsupported targets, which while somewhat functional are typically not ready for general users due to incomplete features or poor stability.

[edit] Customization

Subject to the limitations of each particular platform, the appearance of Rockbox can be customised in various ways. Fonts and foreground and background colours can be added and selected, while a simple markup language can be used to create themes for the menu and while-playing screens. These themes can include background and other images (such as icons), plus various formats for filenames, ID3 tags, Album art, file progress, time and system information.
Rockbox has been essentially a file-tree based player, to which folders could be dragged and dropped, then navigated by folder structure. More recent versions, however, have included a database feature which allows the player to compile information from the files' ID3 tags. The user can then navigate the files using this database regardless of file structure.

[edit] Features

[edit] Codecs

Rockbox on software decoding platforms (non-Archos) supports playback (depending on how you count them) of ten lossy codecs, five lossless, two uncompressed and six miscellaneous formats. This makes a conservative total of 23 supported audio formats, although a few of them do not operate in realtime on all platforms.
MPEG audio layers I-III (MP3/MP2/MP1), Ogg Vorbis, MPEG-4 AAC (in MP4 or RM containers), Musepack, AC3, WMA, Speex, Cook, ATRAC3 and the lossy portion of WavPack hybrid files are supported lossy formats. Lossless formats include FLAC, WavPack, Shorten, Apple Lossless and Monkey's Audio. Rockbox plays Intel-style WAV and Apple AIFF uncompressed audio. In addition, there are playback of game audio types ADX, SID, NSF, SAP and SPC. The MOD tracker format is also now supported.[2]
Note that some profiles in Monkey's Audio are not real time on all targets due to extremely high CPU requirements. Also note that any file with DRM scheme will not play in Rockbox.

[edit] Rockbox features

Beside the ability of playing and recording audio files, Rockbox offers many playback enhancements that other firmware packages may not have implemented yet. Listed below are a handful of these features.
  • Gapless playback
  • Crossfading
  • Replay Gain[3]
  • 5 band fully parametric equalizer[3]
  • Variable speed decoding with pitch correction
  • Crossfeed[3]
  • OTF ("on the fly") playlists
  • True random shuffle (fresh randomly shuffled list every time)
  • Custom UI themes
  • Dynamic Playlists (queue files to play next, or in other parts of a dynamic playlist)
  • Stereo recording to WAV/AIFF/WavPack (lossless) and MP3[4] (supporting devices)
  • FM radio, including FM recording (supporting devices)
  • Remote control (supporting devices)
  • Digital SPDIF input/output (supporting devices)
  • Last.fm support (even on players lacking RTC)
  • Cue sheet support
  • Changeable selector bar
  • Album art[5]
  • Sleep timer

[edit] Plug-ins

Rockbox developers can create plug-ins, which provide the user with other enhancements that may not be available on various firmware modules.
Available plug-ins include:

[edit] Unimplemented features

Rockbox development is always ongoing. However, either due to the lack of support from external companies or platform drawbacks, Rockbox has a few features which are not yet implemented.

[edit] Architecture

Rockbox uses a simple kernel,[9] with a flat memory model (allowing it to run on platforms without a memory management unit) and single process. Thin threads run cooperatively, returning control to a scheduler that prioritizes the audio thread; the only form of preemption is through interrupts. The operating system and plugins are written in C, with assembler used for device- and platform-specific code, in addition to performance sensitive code. The simple and lightweight architecture allows Rockbox to run on a variety of targets, with memory ranging from 1 to 64 MB, and CPU speeds ranging 12 to 532 MHz. Rockbox also provides limited support for multicore and asymmetric multiprocessor systems based on ARM, Coldfire, MIPS and SH.

[edit] Supported devices

iPod mini with Rockbox software
The following should be considered to be a list of devices that at least substantially work (listed as "Supported" or "Usable" on the Rockbox wiki Device Chart). See the Rockbox Device Chart for details.

[edit] Archos

[edit] iRiver

[edit] Cowon

  • X5 and X5L
  • X5V
  • M5 and M5L
  • M3 and M3L
  • D2

[edit] Apple

  • iPod 1st generation
  • iPod 2nd generation
  • iPod 3rd generation
  • iPod 4th generation (grayscale)
  • iPod 4th generation (color/photo)
  • iPod 5th and 5.5 generation (video)
  • iPod mini 1st generation
  • iPod mini 2nd generation
  • iPod nano 1st generation
  • iPod nano 2ndgeneration (basic can play music and supports plugins)

[edit] Toshiba

  • Gigabeat F series (F10/F11/F20/F21/F30/F31/F40/F41/F60)
  • Gigabeat X series
  • Gigabeat S series (Standard build works, requires a couple of external steps.)

[edit] SanDisk

High density microSDHC memory cards can be read by Rockbox in the c200 and e200 series.
The current versions of the Sansa ("v2" or "AMS"), including the c200v2, m200v4 and Clip are not yet supported and are under development. However, as of July 2009 a test build of the Rockbox firmware has been known to successfully run on the Sansa Fuze.
ALI at

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