Rockbox: Difference between revisions
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Although Rockbox's official title is "Rockbox: Open Source Jukebox Firmware", in many instances it is not actually installed to (or run from) flash memory. Instead a minimal bootloader is installed in the supported device's flash which is capable of either loading Rockbox from the hard disk or, alternately, the original factory firmware. | Although Rockbox's official title is "Rockbox: Open Source Jukebox Firmware", in many instances it is not actually installed to (or run from) flash memory. Instead a minimal bootloader is installed in the supported device's flash which is capable of either loading Rockbox from the hard disk or, alternately, the original factory firmware. | ||
== Codecs == | |||
Rockbox on software decoding platforms (non-Archos) supports playback of eleven [[lossy compression|lossy]] codecs (depending on how one counts), five [[lossless data compression|lossless]], two uncompressed and six miscellaneous formats.<ref>{{cite web|title=Rockbox Supported audio formats|url=http://download.rockbox.org/daily/manual/rockbox-sansaclipplus/rockbox-buildap2.html#x17-335000B.1|work=Rockbox Manual}}</ref> This makes a conservative total of 25 supported audio formats, although a few of them do not operate in realtime on all platforms. Extensive work has gone into optimizing each codec, with FLAC, Ogg, WMA, APE and WMA Pro among the fastest known implementations for those formats.<ref>{{cite web|url=http://www.hydrogenaudio.org/forums/index.php?showtopic=82125&view=findpost&p=716976 |title=Codec performance comparison – Hydrogenaudio Forums |publisher=Hydrogenaudio.org |date= |accessdate=2011-03-12}}</ref> | |||
=== Lossy formats === | |||
* MPEG audio layers I-III ([[MP3]]/[[MPEG-1 Audio Layer II|MP2]]/[[MPEG-1 Audio Layer I|MP1]]) | |||
* [[Vorbis|Ogg Vorbis]] | |||
* [[Advanced Audio Coding|MPEG-4 AAC]](-LC/HE/HEv2 profiles) (in [[MPEG-4 Part 14|MP4]] or [[RealMedia|RM]] containers) | |||
* [[Musepack]] | |||
* [[Dolby Digital|AC3]] (raw or [[RealMedia|RM]] container) | |||
* [[Windows Media Audio|WMA Standard]] | |||
* [[Windows Media Audio|WMA Professional]] | |||
* [[Speex]] | |||
* [[Cook Codec|Cook]] | |||
* [[Adaptive Transform Acoustic Coding#ATRAC3 (LP2 and LP4 Modes)|ATRAC3]] | |||
* The lossy portion of [[WavPack]] hybrid files | |||
=== Lossless formats === | |||
* [[Free Lossless Audio Codec|FLAC]] | |||
* [[WavPack]] | |||
* [[Shorten]] | |||
* [[Apple Lossless]] | |||
* [[Monkey's Audio]] | |||
* [[TTA (codec)|TTA]] | |||
=== Uncompressed formats === | |||
* Intel-style [[WAV]] | |||
* Apple [[Audio Interchange File Format|AIFF]] | |||
Together they include over a dozen different [[Pulse-code modulation|PCM]] and [[Adaptive DPCM|ADPCM]] formats. | |||
== External links == | == External links == | ||
Revision as of 15:51, 19 July 2011
Rockbox is a GPL-compliant open source operating system for portable digital audio players (DAPs). The Rockbox Project began in 2002 and was first implemented on the Archos Studio DAP because of owner frustration with severe limitations in the manufacturer-supplied user interface and device operations.
Rockbox can completely replace the host device's operating system firmware and has matured to become an extensible, flexible platform that provides a plug-in architecture for adding PDA functionality, applications, utilities, and games, and has also managed to retrofit video playback functionality onto DAPs first released in mid-2000. Recently, Rockbox now includes a voice-driven user-interface suitable for operation by blind and visually impaired users.
Although Rockbox's official title is "Rockbox: Open Source Jukebox Firmware", in many instances it is not actually installed to (or run from) flash memory. Instead a minimal bootloader is installed in the supported device's flash which is capable of either loading Rockbox from the hard disk or, alternately, the original factory firmware.
Codecs
Rockbox on software decoding platforms (non-Archos) supports playback of eleven lossy codecs (depending on how one counts), five lossless, two uncompressed and six miscellaneous formats.[1] This makes a conservative total of 25 supported audio formats, although a few of them do not operate in realtime on all platforms. Extensive work has gone into optimizing each codec, with FLAC, Ogg, WMA, APE and WMA Pro among the fastest known implementations for those formats.[2]
Lossy formats
- MPEG audio layers I-III (MP3/MP2/MP1)
- Ogg Vorbis
- MPEG-4 AAC(-LC/HE/HEv2 profiles) (in MP4 or RM containers)
- Musepack
- AC3 (raw or RM container)
- WMA Standard
- WMA Professional
- Speex
- Cook
- ATRAC3
- The lossy portion of WavPack hybrid files
Lossless formats
Uncompressed formats
Together they include over a dozen different PCM and ADPCM formats.
External links
~ Text taken from Wikipedia entry for Rockbox