StageFright下的RM视频文件解析帮助文档。
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2011-08-10
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RealMedia File Format (RMFF)
Reference
The Helix architecture supports RealMedia File Format (RMFF), which
enables Helix to deliver high- quality multimedia content over a variety of
network bandwidths. Third-party developers can convert their media formats
into RMFF, enabling Helix Universal Server to deliver the &les to RealPlayer
or other applications built with the Helix Client and Server Software
Development Kit. Third-party developers can thereby use Helix to transport
content over the Internet to their own applications.
RealMedia File Format is a standard tagged &le format that uses four-
character codes to identify &le elements. These codes are 32-bit, represented
by a sequence of one to four ASCII alphanumeric characters, padded on the
right with space characters. The data type for four-character codes is
FOURCC. Use the HX_FOURCC macro to convert four characters into a four-
character code.
The basic building block of a RealMedia File is a chunk , which is a logical
unit of data, such as a stream header or a packet of data. Each chunk
contains the following &elds:
Four-character code specifying the chunk identi&er
32-bit value specifying the size of the data member in the chunk
Blob of opaque chunk data
Depending on its type, a top-level chunk can contain subobjects. This
document describes the tagged chunks contained in RMFF, as well as the
format of the data stored in each type of tagged chunk.
Tagged File Formats
RealMedia
File Format
organizes
tagged
chunks into a
header
section, a
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