Media Transfer Protocol

MTP device
The MCCI® MTP solution is a highly reliable and easily extensible product package for portable device developers that can support any video, image, or music file format. MCCI delivers not just an MTP stack, but an end-to-end solution, including a unique media management database which can play a key role for OEMs in creating differentiated products. The MCCI MTP solution can simplify and enhance the user experience with a variety of mobile multimedia-related functions and services. All MTP capabilities are supported on both wired and wireless USB.

In addition, development and validation tools for both the host and the target devices, and host PC device driver software round out a robust solution that helps developers improve time-to-market and reduce customer-support costs.

MCCI made significant contributions to the definition of the USB-IF MTP specification as well as authoring the USB-IF WMC 1.1 specification. This commitment to standards-based solutions means MCCI brings a deep understanding of MTP and related components, as well as ensuring a product base that will follow future evolution of the MTP standard.

Features and Design
MCCI MTP delivers the rapid access to songs and videos expected by media player users. MCCI MTP and MSS modules are highly flexible, and include APIs that allow the solution to be integrated with user interfaces (UIs), Digital Rights Management systems (DRMs), and application software provided by the OEM or a third-party supplier.

MCCI MTP is capable of transporting any type of data, including Windows Media (WM) formats and non-WM formats like MP3. In the future, MTP may be used for personal information manager (PIM) data synchronization.

Supported playback applications include both Windows Media Player -10 and -11. The MCCI MTP solution also maintains compatibility with content bearing the PlaysForSure logo.

Because MTP is a superset of the Picture Transfer Protocol (PTP), PictBridge is also optionally supported from the same code base. Reflecting its roots as an extension of PTP, the MCCI MTP solution leverages proven MCCI PictBridge know-how by harnessing classic PictBridge components like Direct Print Services, Picture and Media Storage Services, and PTP with MTP extensions.

Dynamic Database Module
MTP icons
Central to the flexibility and high performance of MCCI MTP is our implementation of the Media Storage Services (MSS) module. MSS, which manages the storage of media content, employs a highly efficient database structure that provides rapid searching and sorting of the database by any of the file attributes defined in the MTP specification. MCCI MSS is pre-configured for the most common query types for media player applications. However, the capabilities and OEM value-add opportunities afforded by MCCI MSS go far beyond the basic indexing of songs and videos.

The MCCI MSS database provides OEMs with the tools to incorporate the descriptive information from any type of media content into the media database. A generic query capability allows the OEM total flexibility to configure database indexing, searching and sorting. For example, cell phone photos and videos or content received from proprietary services can be indexed for later retrieval. The end result of centralized indexing of the media content is a simplified user interface, delivering fast and efficient access to all the content stored in the phone.

The MSS database automatically combines internal flash memory and flash card-based content to present a single database to the user interface. The database has other advanced capabilities that allow dynamic configuration of new content types and database queries, and the capability to acquire database information from non-MTP transports, e.g. content downloaded over-the-air via proprietary IP. The database is built using an extremely reliable and fault tolerant internal architecture, providing a "deterministic" degree of reliability.

MTP device
Host PC Software
Cell phones are complex, multi-function devices with special device driver requirements. MCCI also offers Windows drivers for cell phones that include automatic installation for legacy Windows through Windows 7. Many cell phone OEMs have found these to enhance the user's experience and reduce technical support.

Third-Party USB Product Integration
MCCI MTP is optimized for use with the MCCI USB DataPump, but its standards-based architecture is easily ported to third-party USB stacks. It is also supported by the MCCI Wireless USB (WUSB) firmware and toolset. Music phones and media players built with the MCCI MTP solution can integrate with multiple Digital Rights Management (DRM) clients and OEM or third party players and user interfaces. For a “media player quality” download experience, a high-speed USB or WUSB interface is recommended. Wired USB implementations of MCCI MTP work with the following components integrated above the customer’s hardware:
  • Device Controller Driver (DCD)
  • MCCI USB DataPump
  • Still Image Class (SIC) Driver
  • Wireless Mobile Communications (WMC) Modem and Mass Storage Classes
Validation Tools
MCCI provides effective test and simulation software to speed product development:

  • PMPSim is a Windows-based application that provides a Portable Media Player-like user interface, playback, and Windows Media Player synchronization functionality. Because it is built from the same code base as the embedded device code, it can be used to replicate and debug problems in the MTP device.
  • MTPHVT is an MTP host (initiator) emulator. It can assist in testing the functionality, reliability, and fault tolerance of the MTP device. It can capture and display MTP command and response logs. Test scripts are provided to automate product testing and developers can write additional scripts.

Both of the above programs use an MCCI Catena® PCMCIA card to provide a USB device interface that can be connected to a host port on the PC-based test system. Wireless (WUSB) MCCI Catena cards are available as part of the MCCI WUSB composite device support.

Media playback is a greatly desired feature of cell phones. The ability to download music files to the cell phone and to easily and quickly transfer these files to different devices is an effective and powerful way to capture market share. The MCCI MTP solution is a package of product plus services that delivers optimal performance for the best user experience.

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