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m Dating maintenance tags: {{Refimprove}} {{Context}} {{Update}}
 
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{{about|cellular telephones||Quantum critical point}}
{{cleanup-rewrite}}
{{multipleissues|
{{context|date=May 2024}}
{{update|date=May 2024}}
{{refimprove|date=May 2024}}}}
{{Infobox file format
| name = QCP File Format
| icon =
| logo =
| screenshot =
| caption =
| extension = .qcp
| mime = audio/qcelp<ref>{{cite web|url=http://tools.ietf.org/html/rfc3625|title=The QCP File Format and Media Types for Speech Data|last1=Gellens|first1=R.|last2=Garudadri|first2=H.|publisher=[[Internet Engineering Task Force]]|date=September 2003|access-date=2011-03-01}}</ref>
| type code =
| uniform type =
| conforms to =
| magic = RIFF ... QLCM
| owner = [[Qualcomm]]
| released = {{start-date|August 1999}}<ref name ="rfc2658">{{cite web|url=http://tools.ietf.org/html/rfc2658|title=MIME Type Registration of RTP Payload Formats|author=K. McKay|publisher=[[Internet Engineering Task Force]]|date=August 1999|access-date=2011-03-01}}</ref>
| latest release version =
| latest release date =
| genre = [[audio file format]]
| container for = [[QCELP]] 13K, [[Enhanced Variable Rate Codec|Enhanced Variable Rate Coder]] (EVRC), and [[Selectable Mode Vocoder]] (SMV)
| contained by =
| extended from = [[Resource Interchange File Format|RIFF]]
| extended to =
| standard = [http://tools.ietf.org/html/rfc3625 MIME Type Registration of RTP Payload Formats]
| open = ?
| url = {{URL|tools.ietf.org/html/rfc3625}}
}}
⚫
The '''QCP''' file format is used by many cellular telephone manufacturers to provide [[ring tones]] and record voice. It is based on [[Resource Interchange File Format|RIFF]], a generic format for storing chunks of data identified by tags. The QCP format does not specify how voice data in the file is encoded. Rather, it is a [[Container format (digital)|container format]]. QCP files are typically encoded [[Qualcomm code-excited linear prediction|QCELP]] or [[Enhanced Variable Rate Codec|EVRC]].


⚫
Qualcomm, which originated the format, has removed an internal web page link from the page that formerly discussed QCP. "Out of an abundance of caution, due to the December 31st, 2007 injunction ordered against certain Qualcomm products, Qualcomm has temporarily removed certain web content until it can be reviewed and modified if necessary to ensure compliance with the injunction. It may be several more days or weeks before these pages are accessible again. Thank you for your patience."<ref>{{cite web
⚫
The '''QCP''' file format is used by many cellular telephone manufacturers for providing voice [[ring tones]]. It is based on [[RIFF (File format)|RIFF]], a generic format for storing chunks of data identified by tags. The QCP format does not specify how voice data in the file is encoded. Rather, it defines sets of meta-data which identify the encoding scheme used, where individual chunks of the encoded voice data are stored in the file, and supplementary information such as indexing points and text labels. Typical encoding schemes used in QCP files are [[QCELP]] and [[Enhanced Variable Rate Codec|EVRC]].
⚫
|title = About Qualcomm
|publisher = [[Qualcomm]]
|year = 2008
⚫
|url = http://www.qualcomm.com/about/qct_redirect.html
|archive-url = https://wayback.archive-it.org/all/20080227083817/http://www.qualcomm.com/about/qct_redirect.html
|url-status = dead
|archive-date = 2008-02-27
|access-date = 2008-05-14
}} </ref>


QCP files have the same [[magic number (programming)|signature]] as RIFF files: A SOF (start of file) header of 52494646 ("RIFF"), and an EOF (end of file) of 0000.
QCP files created by the Voice Memo feature on a [[Palm Treo]] can be played without conversion by [[Windows Media Player]] if the file is renamed with a [[WAV]] extension. Some other audio file players, such as Real Player, can not play these files, and [[Windows Media Player]] won't play them unless the extension is changed to [[WAV]].


== Playing QCP files ==
However, this technique won't work on all phones, specifically an [[Vx8300|LG VX8300]] using [[Verizon Wireless]], as well as a Motorola Razr V3m using Alltel. There is a work-around that does work, and may be a useful alternative on other phones. If you take the sound file, and email it to yourself directly from your phone, something along the way (your mobile phone provider, i.e. Verizon Wireless or Cricket) translates it to a WAV file, and makes it an attachment to the email. You can then play the WAV attachment directly in [[Windows Media Player]].
Qualcomm previously offered downloads of the software and SDK for its PureVoice voice and audio enhancement products that could play and convert QCP files.<ref>{{cite web

| title =Qualcomm Products and Services - PureVoice Downloads
This workaround does require a plan that allows email, may be slower than directly accessing the file on the phone, and may incur extra charges from the provider.
⚫
| publisher =[[Qualcomm]]

| url =http://www.qualcomm.com/products_services/mobile_content_services/voice/purevoice.html
⚫
Qualcomm, which originated the format, has removed an internal web page link from the page that formerly discussed QCP. "Out of an abundance of caution, due to the December 31st, 2007 injunction ordered against certain Qualcomm products, Qualcomm has temporarily removed certain web content until it can be reviewed and modified if necessary to ensure compliance with the injunction. It may be several more days or weeks before these pages are accessible again. Thank you for your patience."[http://www.qualcomm.com/about/qct_redirect.html]
| access-date =2010-12-28 }}</ref>

==External links==
* RFC 3625 - The QCP File Format and Media Types for Speech Data


== References ==
== References ==
{{reflist}}
<references />
# {{cite web
⚫
| title =About Qualcomm
| work =Qualcomm
⚫
| publisher =Qualcomm
| date =[[2008]]
⚫
| url =http://www.qualcomm.com/about/qct_redirect.html
| accessdate =2008-05-14 }}


[[Category:Digital audio]]
[[Category:Digital audio]]
[[Category:Computer file formats]]

{{comp-sci-stub}}

Latest revision as of 23:02, 5 May 2024

This article is about cellular telephones. For other uses, see Quantum critical point.
QCP File Format
Filename extension
.qcp
Internet media type
audio/qcelp[1]
Magic numberRIFF ... QLCM
Developed byQualcomm
Initial releaseAugust 1999 (1999-08)[2]
Type of formataudio file format
Container forQCELP 13K, Enhanced Variable Rate Coder (EVRC), and Selectable Mode Vocoder (SMV)
Extended fromRIFF
StandardMIME Type Registration of RTP Payload Formats
Open format??
Websitetools.ietf.org/html/rfc3625

The QCP file format is used by many cellular telephone manufacturers to provide ring tones and record voice. It is based on RIFF, a generic format for storing chunks of data identified by tags. The QCP format does not specify how voice data in the file is encoded. Rather, it is a container format. QCP files are typically encoded QCELP or EVRC.

Qualcomm, which originated the format, has removed an internal web page link from the page that formerly discussed QCP. "Out of an abundance of caution, due to the December 31st, 2007 injunction ordered against certain Qualcomm products, Qualcomm has temporarily removed certain web content until it can be reviewed and modified if necessary to ensure compliance with the injunction. It may be several more days or weeks before these pages are accessible again. Thank you for your patience."[3]

QCP files have the same signature as RIFF files: A SOF (start of file) header of 52494646 ("RIFF"), and an EOF (end of file) of 0000.

Playing QCP files

[edit]

Qualcomm previously offered downloads of the software and SDK for its PureVoice voice and audio enhancement products that could play and convert QCP files.[4]

References

[edit]
  1. ^ Gellens, R.; Garudadri, H. (September 2003). "The QCP File Format and Media Types for Speech Data". Internet Engineering Task Force. Retrieved 2011-03-01.
  2. ^ K. McKay (August 1999). "MIME Type Registration of RTP Payload Formats". Internet Engineering Task Force. Retrieved 2011-03-01.
  3. ^ "About Qualcomm". Qualcomm. 2008. Archived from the original on 2008-02-27. Retrieved 2008-05-14.
  4. ^ "Qualcomm Products and Services - PureVoice Downloads". Qualcomm. Retrieved 2010-12-28.
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