Adobe Flash Player (labeled Shockwave Flash in Internet Explorer and Firefox) is freeware software for using content created on the Adobe Flash platform, including viewing multimedia, executing rich Internet applications, and streaming video and audio. Flash Player can run from a web browser as a browser plug-in or on supported mobile devices. Flash Player was created by Macromedia and has been developed and distributed by Adobe Systems since Adobe acquired Macromedia.
Flash Player is distributed for free and its plug-in versions are available for every major web browser and operating system. Google Chrome comes bundled with the sandboxed Adobe Flash plug-in and Windows 8 and later come with their own integrated Flash Player (for Internet Explorer and Edge).
Flash Player has a wide user base, and is a common format for games, animations, and graphical user interfaces (GUIs) embedded in web pages. Adobe stated in 2013 that more than 400 million out of over 1 billion connected desktops update to the new version of Flash Player within six weeks of release.
The app is also widely criticized for the many security vulnerabilities it brings to computers, with critics recommending to disable or uninstall it.
Adobe Flash Player is a runtime that executes and displays content from a provided SWF file, although it has no in-built features to modify the SWF file at runtime. It can execute software written in the ActionScript programming language which enables the runtime manipulation of text, data, vector graphics, raster graphics, sound and video. The player can also access certain connected hardware devices, including web cameras and microphones, after permission for the same has been granted by the user.
Flash Player is used internally by the Adobe Integrated Runtime (AIR), to provide a cross-platform runtime environment for desktop applications and mobile applications. AIR supports installable applications on Windows, Linux, macOS, and some mobile operating systems such as iOS and Android. Flash applications must specifically be built for the AIR runtime to use additional features provided, such as file system integration, native client extensions, native window/screen integration, taskbar/dock integration, and hardware integration with connected Accelerometer and GPS devices.
Flash Player is primarily a graphics and multimedia platform, and has supported raster graphics and vector graphics since its earliest version. It supports the following different multimedia formats which it can natively decode and playback.
Until version 10 of the Flash player, there was no support for GPU acceleration. Version 10 added a limited form of support for shaders on materials in the form of the Pixel Bender API, but still did not have GPU-accelerated 3D vertex processing. A significant change came in version 11, which added a new low-level API called Stage3D (initially codenamed Molehill), which provides full GPU acceleration, similar to WebGL. (The partial support for GPU acceleration in Pixel Bender was completely removed in Flash 11.8, resulting in the disruption of some projects like MIT's Scratch, which lacked the manpower to recode their applications quickly enough.)
Current versions of Flash Player are optimized to use hardware acceleration for video playback and 3D graphics rendering on many devices, including desktop computers. Performance is similar to HTML5 video playback. Also, Flash Player has been used on multiple mobile devices as a primary user interface renderer.
Although code written in ActionScript 3 executes up to 10 times faster than the prior ActionScript 2, the Adobe ActionScript 3 compiler is a non-optimizing compiler, and produces inefficient bytecode in the resulting SWF, when compared to toolkits such as CrossBridge.
CrossBridge, a toolkit that targets C++ code to run within the Flash Player, uses the LLVM compiler to produce bytecode that runs up to 10 times faster than code the ActionScript 3 compiler produces, only because the LLVM compiler uses more aggressive optimization.
Adobe has released ActionScript Compiler 2 (ASC2) in Flex 4.7 and onwards, which improves compilation times and optimizes the generated bytecode and supports method inlining, improving its performance at runtime.
As of 2012, the Haxe multiplatform language can build programs for Flash Player that perform faster than the same application built with the Adobe Flex SDK compiler.
Flash Player applications and games can be built in two significantly different methods:
In both methods, developers can access the full Flash Player set of functions, including text, vector graphics, bitmap graphics, video, audio, camera, microphone, and others. AIR also includes added features such as file system integration, native extensions, native desktop integration, and hardware integration with connected devices.
Adobe provides five ways of developing applications for Flash Player:
Third-party development environments are also available:
Adobe offers the free Adobe Gaming SDK, consisting (as of August 2014[update]) of several open-source AS3 libraries built on the Flash Player Stage3D APIs for GPU-accelerated graphics:
A few commercial game engines target Flash Player (Stage3D) as run-time environment, such as Unity 3D and Unreal Engine 3. Before the introduction of Stage3D, a number of older 2D engines or isometric engines like Flixel saw their heyday.
Adobe also developed the CrossBridge toolkit which cross-compiles C/C++ code to run within the Flash Player, using LLVM and GCC as compiler backends, and high-performance memory-access opcodes in the Flash Player (termed "Domain Memory") to work with in-memory data quickly. CrossBridge is targeted toward the game development industry, and includes tools for building, testing, and debugging C/C++ projects in Flash Player.
Adobe Flash Player is available in four flavors:
On February 22, 2012, Adobe announced that it will no longer release new versions of NPAPI Flash plugins for Linux, although Flash Player 11.2 would continue to receive security updates. In August 2016 Adobe announced that, beginning with version 24, it will resume offering of Flash Player for Linux for other browsers.
The Extended Support Release (ESR) of Flash Player on macOS and Windows was a version of Flash Player kept up to date with security updates, but none of the new features or bug fixes available in later versions. It has been on version 11.7 as of July 9, 2013, version 13 as of May 13, 2014, and version 18 as of August 11, 2015. Adobe has decided to discontinue the ESR branch and instead focus solely on the standard release as of August 2016.
|Platform||Latest version||Browser support|
|Windows XP and later
Windows Server 2003 and later
|18.104.22.168||Firefox, Chrome, Chromium, Safari, Opera, Internet Explorer, Microsoft Edge|
|Windows 98 and ME||22.214.171.124||?|
|Windows 95 and NT 4||126.96.36.199||?|
|Mac OS X 10.6 or later||188.8.131.52||Firefox, Chrome, Chromium, Safari, Opera|
|Mac OS X 10.5||10.3.183.90||?|
|Classic Mac OS, PowerPC||184.108.40.206||?|
|Classic Mac OS, 68k||5.0||?|
|Linux||220.127.116.11||Firefox, Chrome, Chromium, Opera|
In 2011, Flash Player had emerged as the de facto standard for online video publishing on the desktop, with adaptive bitrate video streaming, DRM, and fullscreen support. On mobile devices however, after Apple refused to allow the Flash Player within the inbuilt iOS web browser, Adobe changed strategy, enabling Flash content to be delivered as native mobile applications using the Adobe Integrated Runtime.
Up until 2012, Flash Player 11 was available for the Android (ARM Cortex-A8 and above), although in June 2012, Google announced that Android 4.1 (codenamed Jelly Bean) would not support Flash by default. Starting in August 2012, Adobe no longer updates Flash for Android. In spite of this, Adobe Flash is still available to install on Android devices via Adobe's update archives (up to Android 4.3).
Flash Player is certified to be supported on a select range of mobile and tablet devices, from Acer, BlackBerry 10, Dell, HTC, Lenovo, Logitech, LG, Motorola, Samsung, Sharp, SoftBank, Sony (and Sony Ericsson), and Toshiba. As of 2012, Adobe has stopped browser-based Flash Player development for mobile browsers in favor of HTML5, however Adobe continues to support Flash content on mobile devices with the Adobe Integrated Runtime, which allows developers to publish content that runs as native applications on certain supported mobile phone platforms.
Version 9 is the most recent version currently available for the Linux/ARM-based Nokia 770/N800/N810 Internet tablets running Maemo OS2008, classic Mac OS and Windows 95/NT. Version 10 can be run under Windows 98/Me using KernelEx. HP offers Version 6 of the player for HP-UX. Other versions of the player have been available at some point for OS/2, Symbian OS, Palm OS, BeOS and IRIX. The Kodak Easyshare One includes Flash Player.
Adobe said it will optimize Flash for use on ARM architecture (ARMv7 and ARMv6 architectures used in the Cortex-A series of processors and in the ARM11 family) and release it in the second half of 2009. The company also stated it wants to enable Flash on NVIDIA Tegra, Texas Instruments OMAP 3 and Samsung ARMs. Beginning 2009, it was announced that Adobe would be bringing Flash to TV sets via Intel Media Processor CE 3100 before mid-2009. ARM Holdings later said it welcomes the move of Flash, because "it will transform mobile applications and it removes the claim that the desktop controls the Internet." However, as of May 2009, the expected ARM/Linux netbook devices had poor support for Web video and fragmented software base.
Among other devices, LeapFrog Enterprises provides Flash Player with their Leapster Multimedia Learning System and extended the Flash Player with touch-screen support. Sony has integrated Flash Player 6 into the PlayStation Portable's web browser via firmware version 2.70 and Flash Player 9 into the PlayStation 3's web browser in firmware version 2.50. Nintendo has integrated Flash Lite 3.1, equivalent to Flash 8, in the Internet Channel on the Wii.
The following table documents Flash Player and AIR support on mobile operating systems:
|Android 2.2–4.1, ARM Cortex-A8+||Flash Player 11.1, AIR 3.1|
|Android 2.1||Flash Lite 3.0|
|iOS||Flash Player 11.1, AIR 3.1|
|BlackBerry 10.0–10.3.1||Flash Player 11.1, AIR 3.1|
|BlackBerry Tablet OS||Flash Player 11.1, AIR 3.1|
|Maemo||Flash Player 9.4|
|PlayStation 3 with Firmware 2.50, NetFront 2.81||Flash Player 9.1 (update 3)|
|PSP with Firmware 2.70||Flash Player 6|
|Symbian OS||Flash Lite 4.0|
|Wii (Internet Channel)||Flash Lite 3.1|
|Pocket PC 2003||Flash Player 7|
|Windows Mobile 5||Flash Player 7|
Some CPU emulators have been created for Flash Player, including Chip8, Commodore 64, ZX Spectrum and the Nintendo Entertainment System. They enable video games created for such platforms to run within Flash Player.
Adobe has taken steps to reduce or eliminate Flash licensing costs. For instance, the SWF file format documentation is provided free of charge after they relaxed the requirement of accepting a non-disclosure agreement to view it in 2008. Adobe also created the Open Screen Project which removes licensing fees and opens data protocols for Flash.
Adobe has also open-sourced many components relating to Flash.
However, Adobe has not been willing to make complete source code of the Flash Player available for free software development. Free and open source alternatives to the Adobe Flash Player such as Shumway and Gnash have been built, but are no longer under active development and therefore not a viable alternative. The only fully functional open-source third-party Flash Player is the commercially available Scaleform GFx Player, which is game development middleware designed for integration into non-Flash video games.
In some browsers, prior Flash versions have had to be uninstalled before an updated version could be installed. However, as of version 11.2 for Windows, there are now automatic updater options. Linux is partially supported, as Adobe is cooperating with Google to implement it via Chrome web browser on all Linux platforms.
Mixing Flash applications with HTML leads to inconsistent behavior with respect to input handling (keyboard and mouse not working as they would in an HTML-only document). This is often done in web sites and can lead to poor user experience with the site.
The February 20, 2014 update to 18.104.22.168 introduced a reported bug, producing green video with sound only. This defect is related to hardware acceleration and may be overcome by disabling hardware acceleration via the Adobe settings in Firefox (accessed by right clicking within the video) or in Internet Explorer (within the Tools settings). This defect may be related to widely used graphics hardware, AMD Radeon HD video cards, and similar visual defects have occurred in earlier Flash updates, with the same workaround.
Flash Player supports persistent local storage of data (also referred to as Local Shared Objects), which can be used similarly to HTTP cookies or Web Storage in web applications. Local storage in Flash Player allows websites to store non-executable data on a user's computer, such as authentication information, game high scores or saved games, server-based session identifiers, site preferences, saved work, or temporary files. Flash Player will only allow content originating from exactly the same website domain to access data saved in local storage.
Because local storage can be used to save information on a computer that is later retrieved by the same site, a site can use it to gather user statistics, similar to how HTTP cookies and Web Storage can be used. With such technologies, the possibility of building a profile based on user statistics is considered by some a potential privacy concern. Users can disable or restrict use of local storage in Flash Player through a "Settings Manager" page. These settings can be accessed from the Adobe website or by right-clicking on Flash-based content and selecting "Global Settings".
Local storage can be disabled entirely or on a site-by-site basis. Disabling local storage will block any content from saving local user information using Flash Player, but this may disable or reduce the functionality of some websites, such as saved preferences or high scores and saved progress in games.
Flash Player 10.1 and upward honor the privacy mode settings in the latest versions of the Chrome, Firefox, Internet Explorer, and Safari web browsers, such that no local storage data is saved when the browser's privacy mode is in use.
Adobe security bulletins and advisories announce security updates, but Adobe Flash Player release notes do not disclose the security issues addressed when a release closes security holes, making it difficult to evaluate the urgency of a particular update. A version test page allows the user to check if the latest version is installed, and uninstallers may be used to ensure that old-version plugins have been uninstalled from all installed browsers.
In February 2010, Adobe officially apologized for not fixing a known vulnerability for over a year. In June 2010 Adobe announced a "critical vulnerability" in recent versions, saying there are reports that this vulnerability is being actively exploited in the wild against both Adobe Flash Player, and Adobe Reader and Acrobat. Later, in October 2010, Adobe announced another critical vulnerability, this time also affecting Android-based mobile devices. Android users have been recommended to disable Flash or make it only on demand. Subsequent security vulnerabilities also exposed Android users, such as the two critical vulnerabilities published in February 2013 or the four critical vulnerabilities published in March 2013, all of which could lead to arbitrary code execution.
Symantec's Internet Security Threat Report states that a remote code execution in Adobe Reader and Flash Player was the second most attacked vulnerability in 2009. The same report also recommended using browser extensions to disable Flash Player usage on untrusted websites. McAfee predicted that Adobe software, especially Reader and Flash, would be primary target for attacks in 2010. Adobe applications had become, at least at some point, the most popular client-software targets for attackers during the last quarter of 2009. The Kaspersky Security Network published statistics for the third quarter of 2012 showing that 47.5% of its users were affected by one or more critical vulnerabilities. The report also highlighted that "Flash Player vulnerabilities enable cybercriminals to bypass security systems integrated into the application."
Steve Jobs criticized the security of Flash Player, noting that "Symantec recently highlighted Flash for having one of the worst security records in 2009". Adobe responded by pointing out that "the Symantec Global Internet Threat Report for 2009, found that Flash Player had the second lowest number of vulnerabilities of all Internet technologies listed (which included both web plug-ins and browsers)."
April 7, 2016, Adobe released a Flash Player patch for a zero-day memory corruption vulnerability CVE-2016-1019 that could be used to deliver malware via the Magnitude exploit kit. The vulnerability could be exploited for remote code execution.
Flash Player 11.2 does not play certain kinds of content unless it has been digitally signed by Adobe, following a license obtained by the publisher directly from Adobe.
This move by Adobe, together with the abandonment of Flex to Apache was criticized as a way to lock out independent tool developers, in favor of Adobe's commercial tools.
This has been resolved as of January 2013, after Adobe no longer requires a license or royalty from the developer. All premium features are now classified as general availability, and can be freely used by Flash applications.
In April 2010, Steve Jobs, at the time CEO of Apple Inc. published an open letter explaining why Apple would not support Flash on the iPhone, iPod touch and iPad. In the letter he blamed problems with the "openness", stability, security, performance, and touchscreen integration of the Flash Player as reasons for refusing to support it. He also claimed that when one of Apple's Macintosh computers crashes, "more often than not" the cause can be attributed to Flash, and described Flash as "buggy". Adobe's CEO Shantanu Narayen responded by saying, "If Flash [is] the number one reason that Macs crash, which I'm not aware of, it has as much to do with the Apple operating system."
Steve Jobs also claimed that a large percentage of the video on the Internet is supported on iOS, since many popular video sharing websites such as YouTube have published video content in an HTML5 compatible format, enabling videos to playback in mobile web browsers even without Flash Player.
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