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P800/P802
White Paper, January 2003
40
The name ‘streaming’ refers to the technique it is based on. Previously it was necessary to
download an entire file to the hard disk or mobile phone and then play it, whereas through
streaming the user can begin to watch or hear the content of a requested file after only a short
delay. The data in the file is broken into small packets that are sent in a continuous flow, a
stream, to the end-user’s computer or mobile phone. It is then possible to begin viewing the file
from the beginning as the rest of the packets are transferred to the end-user’s machine or mobile
phone while playing. The short delay at the start is to enable a small amount of data to be
buffered. The data buffer enables playback to continue uninterrupted despite variations in the rate
of received data.
Applications
The applications which can be built on top of the streaming services, can be classified into on-
demand and live information delivery applications. Examples of the first category are music and
video, news-on-demand applications as well as on-demand instructions material. Delivery of radio
and television programmes are examples of live information delivery applications.
User scenarios
•
Streaming of music on demand
• Streaming of news (video, audio) on demand
•
Streaming of movie trailers on demand
•
Streaming and download of video on demand
• Live streaming of music/video (broadcast)
Standards, architecture and protocol
Sony Ericsson supports the architecture, protocols and codecs for the PSS (Packet Switched
Streaming) within the 3GPP system, as well as supports all ongoing standardization activities
within 3GPP. Sony Ericsson constantly works to follow standards and to ensure interoperability
between business solutions, and also stands up to meet additional market requirements within
this area. The relevant 3GPP specification is TS 26.233 “Transparent end-to-end packet switch
streaming service (PSS).” The PSS includes media codecs for video, still images, bitmap
graphics, text, audio, and speech.
P800 Video Player
The P800 Video Player is used in Flip Open mode.
Locally Stored Clips
Video clips may be downloaded from the internet or copied over from a connected PC. Video files
are large compared to still images. The demonstration videos Sony Ericsson has shown on the
P800 require approximately 1 Mbyte storage per minute. Video files may be stored on Memory
Stick as well as internal storage.
Files must be .3GP or .MP4 having video coded in MPEG-4 Simple Visual Profile and audio in
AAC or AMR format.