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The Bfv API Functions
November 2009 47
The Infopkt Stream
An infopkt stream is a file or memory buffer containing concatenated
individual infopkts. The length of an infopkt stream is limited only
by the file size conventions specific to an operating system. The
BfvInfopktOpen function opens file-based infopkt streams, and the
BfvInfopktOpenMem function opens memory-based infopkt
streams.
For speech record and play applications, the first infopkt in the
infopkt stream depends on the type of speech file.
If the speech file is an indexed prompt file (see mkprompt on
page 155 in this manual, and the BfvPromptPlay function in
Volume 3 of the Bfv API Reference Manual), an
INFOPKT_PROMPT_MAP infopkt begins the infopkt stream. An
INFOPKT_SPEECH_PARAMETERS infopkt begins each new speech file
embedded within the infopkt stream.
If the speech file is a simple speech file, one recorded with the
BfvSpeechRecord function, an INFOPKT_SPEECH_PARAMETERS
infopkt begins the infopkt stream.
Creating an Infopkt Stream
The mkinfopk program, included on the distribution media, builds
an infopkt stream. It has the following command syntax:
mkinfopk -o output_fname {infopkt_type arg}...
For more detailed information on mkinfopk, see mkinfopk on
page 153 in this manual.
The decode program, also included on the distribution media, reads a
specified infopkt stream and lists the individual infopkts within the
stream. See Sample Applications and Utilities on page 127 in this
volume for more detailed information on how to use this utility.
Figure 2 illustrates how to create an infopkt stream to play either an
indexed prompt file or a simple speech file. You must create a
separate infopkt stream for each type.
-o output_fname Is the name of the output file.
infopkt_type Indicates the type of infopkt which follows.
arg Is the argument for the infopkt. Depending on
the infopkt_type, it is either a filename or a
dummy value.