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A FourCC ('four-character code') is a sequence of four bytes (typically ASCII) used to uniquely identify data formats. It originated from the OSType or ResType metadata system used in classic Mac OS and was adopted for the Amiga/Electronic ArtsInterchange File Format and derivatives. The idea was later reused to identify compressed data types in QuickTime and DirectShow.

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History[edit]

In 1984, the earliest version of a Macintosh OS, System 1, was released. It used the single-level Macintosh File System with metadata fields including file types, creator (application) information, and forks to store additional resources. All these fields are four-character codes known as OSType. It was possible to change this information without changing the data itself, so that they could be interpreted differently. Identical codes were used throughout the system, as type tags for all kinds of data.^[1][2]

In 1985, Electronic Arts introduced the Interchange File Format (IFF) meta-format (family of file formats), originally devised for use on the Amiga. These files consisted of a sequence of 'chunks', which could contain arbitrary data, each chunk prefixed by a four-byte ID. The IFF specification explicitly mentions that the origins of the FourCC idea lie with Apple.^[3]

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This IFF was adopted by a number of developers including Apple for AIFF files and Microsoft for RIFF files (which were used as the basis for the AVI and WAV file format). Apple referred to many of these codes as OSTypes. Microsoft and Windows developers refer to their four-byte identifiers as FourCCs or Four-Character Codes. FourCC codes were also adopted by Microsoft to identify data formats used in DirectX, specifically within DirectShow and DirectX Graphics.

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In Apple systems[edit]

Since Mac OS X Panther, OSType signatures are one of several sources that may be examined to determine a Uniform Type Identifier and are no longer used as the primary data type signature. Mac OS X (macOS) prefers the more colloquial convention of labelling file types using file name extensions. At the time of the change, the change was a source of great contention among older users, who believed that Apple was reverting to a more primitive way that misplaces metadata in the filename.

Filesystem-associated type codes are not readily accessible for users to manipulate, although they can be viewed and changed with certain software, most notably the macOS command line tools GetFileInfo and SetFile which are installed as part of the developer tools into /Developer/Tools, or the ResEdit utility available for older Macs.^[4][5]

Technical details[edit]

The byte sequence is usually restricted to ASCII printable characters, with space characters reserved for padding shorter sequences. Case sensitivity is preserved, unlike in file extensions. FourCCs are sometimes encoded in hexadecimal (e.g., '0x31637661' for 'avc1')^[6][7][8] and sometimes encoded in a human-readable way (e.g., 'mp4a'). Some FourCCs however, do contain non-printable characters, and are not human-readable without special formatting for display; for example, 10bit Y'CbCr4:2:2 video can have a FourCC of ('Y', '3', 10, 10)^[9] which ffmpeg displays as rawvideo (Y3[10] [10] / 0x0A0A3359), yuv422p10le.

Four-byte identifiers are useful because they can be made up of four human-readable characters with mnemonic qualities, while still fitting in the four-byte memory space typically allocated for integers in 32-bit systems (although endian issues may make them less readable). Thus, the codes can be used efficiently in program code as integers, as well as giving cues in binary data streams when inspected.

Compiler support[edit]

FourCC is written in big endian relative to the underlying ASCII character sequence, so that it appears in the correct byte order when read as a string. Many C compilers, including GCC, define a multi-character literal behavior of right-aligning to the least significant byte, so that '1234' becomes 0x31323334 in ASCII.^[10] This is the conventional way of writing FourCC codes used by Mac OS programmers for OSType. (Classic Mac OS was exclusively big-endian.)

On little-endian machines, a byte-swap on the value is required to make the result correct. Taking the avc1 example from above: although the literal 'avc1' already converts to the integer value 0x61766331, a little-endian machine would have reverse the byte order and stored the value as 31 63 76 61. To yield the correct byte sequence 61 76 63 31, the pre-swapped value 0x31637661 is used.

Common uses[edit]

One of the most well-known uses of FourCCs is to identify the video codec or video coding format in AVI files. Common identifiers include DIVX, XVID, and H264. For audio coding formats, AVI and WAV files use a two-byte identifier, usually written in hexadecimal (such as 0055 for MP3). In QuickTime files, these two-byte identifiers are prefixed with the letters 'ms' to form a four-character code. RealMedia files also use four-character codes, however, the actual codes used differ from those found in AVI or QuickTime files.

Other file formats that make important use of the four-byte ID concept are the Standard MIDI File (SMF) format, the PNG image file format, the 3DS (3D Studio Max) mesh file format and the ICC profile format.

Other uses for OSTypes include:

• as Gestalt selector codes
• as record field IDs and event type and class IDs in AppleEvents
• for identifying components in the Component Manager
• as “atom” IDs in the QuickTime movie and image file formats
• as a localization-independent way of identifying standard folders in the Folder Manager
• in QuickDraw GX, they were used as gxTag types and also as types of collection items in the Collection Manager.
• as error codes in certain libraries, such as QuickTime

Four-character codes are also used in applications other than file formats, for example:

• UEFI Forum for vendor in the ACPI ID Registry^[11]
• ACPI specification defines four-character identifiers in ACPI Source Language (ASL)
• Synopsys to tell component ID via registers of an IP (DesignWare collection)

See also[edit]

• Filename extension (also known as 'file extension')
• OSType

References[edit]

1. ^The Type/Creator Database
2. ^'Signatures of Macintosh Files'. Logiciels & Services Duhem. Retrieved December 1, 2015.
3. ^Morrison, Jerry (January 14, 1985). ''EA IFF 85' Standard for Interchange Format Files'. Electronic Arts.
4. ^'GetFileInfo', Darwin reference (man page), Apple
5. ^'SetFile', Darwin reference (man page), Apple
6. ^online-metadata.com. 'What Is A Codec Tag?'. What Is A Codec Tag?. Retrieved June 9, 2019.
7. ^'git.videolan.org Git - ffmpeg.git/blob - libavformat/isom.c'. git.videolan.org. Retrieved June 9, 2019.
8. ^'FFmpeg/FFmpeg search'. GitHub. Retrieved June 9, 2019.
9. ^'FFmpeg: libavcodec/raw.c Source File'. ffmpeg.org. Retrieved June 9, 2019.
10. ^'The C Preprocessor: Implementation-defined behavior'. gcc.gnu.org.
11. ^'ACPI ID Registry'. uefi.org.

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General references[edit]

• Fleischman, E. (June 1998). 'RFC2361 - WAVE and AVI Codec Registries'. Internet Assigned Numbers Authority (IANA).
• 'Audio Subtype GUIDs'. Microsoft. Retrieved February 23, 2017.
• Kroon, Dirk-Jan (February 16, 2011). 'List Video Codecs, FourCC'. MathWorks (published September 13, 2010). This function GETFOURCC gives a list of available Video encoder-codecs in the current Windows installation
• 'Video codecs and Pixel Formats'. FourCC. Retrieved February 23, 2017.

This download contains the latest driver and applications for use with your Sound Blaster JAM on Mac operating systems. The highlight of this package, the Sound Blaster JAM Control Panel, provides you with various configuration options to enhance the performance of your product.

To install this pack, do the following:

- Download the file onto your local hard disk.
- Double-click the downloaded file to uncompress it.
- Double-click the uncompressed DMG file.
- Double-click the Install icon and follow the instructions on screen.

About Headset Drivers:

When headsets are connected, the operating system usually installs a generic driver that helps the computer to recognize the newly attached device and to use its basic functions.
Naturally, if you want to have all developed features accessible, proper software must be applied. This task also allows computers to properly recognize all headset characteristics such as manufacturer, model, connection type, and others.
Updating the driver version might improve sound quality, resolve different issues encountered throughout the headset’s usage period, provide you with new configuration options, and make various changes that enhance the unit’s stability and compatibility.
To install this release, simply get the package, extract it if necessary, and run the available setup. Afterwards, follow the displayed instructions and, when done, perform a system restart and reconnect the headset to make sure that all changes take effect properly.
That being said, click the download button, get the desired package and apply it on your system. Also, don’t forget to check with our website as often as possible so that you don’t miss a single new release.

It is highly recommended to always use the most recent driver version available.
Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.