Streaming media
Store streaming data in a streaming media track for QuickTime movies.
Overview
QuickTime movies store streaming data in a streaming media track. This media has a media type of 'strm'.
Streaming Media Sample Description
The streaming media sample description contains information that defines how to interpret streaming media data. This sample description is based on the standard sample description header, as described in Sample table atom ('stbl').
The streaming media sample description is documented in the QuickTime header file QTSMovie.h, as follows:
struct QTSSampleDescription {
long descSize;
long dataFormat;
long resvd1; /* set to 0*/
short resvd2; /* set to 0*/
short dataRefIndex;
UInt32 version;
UInt32 resvd3; /* set to 0*/
SInt32 flags;
/* qt atoms follow:*/
/* long size, long type, some data*/
/* repeat as necessary*/
};
typedef struct QTSSampleDescription QTSSampleDescription;The sample format depends on the dataFormat field of the QTSSampleDescription. The dataFormat field can be any value you specify. The currently defined values are 'rtsp' and 'sdp '.
If 'rtsp', the sample can be just an rtsp URL. It can also be any value that you can put in a .rtsp file, as defined at
http://streaming.apple.com/qtstreaming/documentation/userdocs/rtsptags.htm
If 'sdp ', then the sample is an SDP file. This would be used to receive a multicast broadcast.