Media Transfer Protocol For Mac

Contents • • • • • • • • • • • Description [ ] PTP specifies a way of creating, transferring and manipulating objects which are typically photographic images such as a file. While it is common to think of the objects that PTP handle as, they are abstract entities identified solely by a 32-bit object ID. These objects can however have parents and siblings so that a file-system–like view of device contents can be created. History [ ] Until the standardization of PTP, digital camera vendors used different proprietary protocols for controlling digital cameras and transferring images to computers and other host devices. The term 'Picture Transfer Protocol' and the acronym 'PTP' were both coined by Steve Mann, summarizing work on the creation of a Linux-friendly way of transferring pictures to and from home-made wearable computers, at a time when most cameras required the use of Microsoft Windows or Mac OS device drivers to transfer their pictures to a computer. PTP was originally standardized as PIMA 15470 in 2000, while it was developed by the IT10 committee. Key contributors to the standard included Tim Looney and Tim Whitcher (Eastman Kodak Company) and Eran Steinberg (Fotonation).

Storage [ ] PTP does not specify a way for objects to be stored – it is a communication protocol. Nor does it specify a transport layer. However, it is designed to support existing standards, such as,,, and, and is commonly implemented over the and transport layers. Images on digital cameras are generally stored as files on a, such as a, which is formatted with a file system, most commonly, or, which may be laid out as per the (DCF) specification. But none of these are required as PTP abstracts from the underlying representation. By contrast, if a camera is mounted via, the physical file system and layout are exposed to the user. Device control [ ] Many modern digital cameras from Canon and Nikon can be controlled via PTP from a USB host enabled computing device (Smartphone, PC or for example).

As is the norm for PTP, the communication takes place over a USB connection. When interacting with the camera in this manner, it is expected that the are in (synchronous) Bulk Transfer Mode, for getting/setting virtually all the camera's features/properties (such as ISO, Aperture, Shutter speed and focus). Events raised by the camera, in response to specific actions performed by the host device, are sent back to the host via the USB asynchronous Interrupt endpoint. In addition to changing the camera's settings and operating mode, it is possible to receive a through-the-lens view using 'Live View'. As described above, the storage objects of the camera's memory cards can be manipulated too.

By controlling a camera in this way it is possible to augment its capabilities. For example, if the controlling software was running on a Smartphone with functionality, it would be possible to add the GPS coordinates to an image's data, at the time of image capture - even if the camera itself had no GPS functionality. Extensions [ ] A number of protocols have been developed that extend PTP. PTP/IP, developed by and first implemented in a round of digital cameras by,, and, allows data transfer over any -based network. (MTP), developed by, allows for transfer over wireless or wired networks based in part on FotoNation's PTP/IP, but also allows users to transfer other media aside from pictures, as well as for tagging objects with extended (such as title, artist and similar).

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