QCP
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| Filename extension | .qcp |
|---|---|
| Internet media type | audio/qcelp[1] |
| Magic number | RIFF ... QLCM |
| Developed by | Qualcomm |
| Initial release | August 1999[2] |
| Type of format | audio file format |
| Container for | QCELP 13K, Enhanced Variable Rate Coder (EVRC), and Selectable Mode Vocoder (SMV) |
| Extended from | RIFF |
| Standard(s) | MIME Type Registration of RTP Payload Formats |
| Open format? | ? |
| Website | 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 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 can also be identified by their SOF (Start of file) header, which is 52494646 and the EOF (End of File) of 0000.
[edit] Playing QCP files
Qualcomm offers downloads of the software and SDK for its PureVoice voice and audio enhancement products that can play and convert QCP files.[4] Various shareware players and media conversion sites claim to handle QCP files.
[edit] References
- ^ Gellens, R.; Garudadri, H. (2003-09). "The QCP File Format and Media Types for Speech Data". Internet Engineering Task Force. http://tools.ietf.org/html/rfc3625. Retrieved 2011-03-01.
- ^ K. McKay (1999-08). "MIME Type Registration of RTP Payload Formats". Internet Engineering Task Force. http://tools.ietf.org/html/rfc2658. Retrieved 2011-03-01.
- ^ "About Qualcomm". Qualcomm. 2008. http://www.qualcomm.com/about/qct_redirect.html. Retrieved 2008-05-14.[dead link]
- ^ "Qualcomm Products and Services - PureVoice Downloads". Qualcomm. http://www.qualcomm.com/products_services/mobile_content_services/voice/purevoice.html. Retrieved 2010-12-28.
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