Creative SB0350 Hardware Programming Guide - Page 130

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B-6 File Format Here is a discussion of various fields: bBlockID The Block Type identifier is 3. nBlockLen Length of the block (in bytes), excluding the bBlockID and nBlockLen fields. The value is 3. wPausePeriod This is a 2-byte field which specifies the pause period in units of sampling cycles. Total pause cycle is wPausePeriod plus 1. bTimeConstant This is a 1-byte field which indicates the Time Constant of the pause period. The Time Constant calculation is the same as described in Block Type 1. Block Type 4 This is a special block that specifies a Marker in the digitized sound data. The Block Header is organized as follows: BYTE BYTE WORD bBlockID; nBlockLen[3]; wMarker; // == 4 // 3-byte block length // marker value Here is a discussion of various fields: bBlockID The Block Type identifier is 4. nBlockLen Length of the block (in bytes), excluding the bBlockID and nBlockLen fields. The value is 2. wMarker This is a 2-byte field which specifies the marker value. The marker value can be any value between 1 to 0FFFE hex inclusive. The 0 and 0FFFF hex values are reserved by the digitized sound drivers.

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B-6
File Format
Here is a discussion of various fields:
bBlockID
The Block Type identifier is 3.
nBlockLen
Length of the block (in bytes), excluding the
bBlockID
and
nBlockLen
fields.
The value is 3.
wPausePeriod
This is a 2-byte field which specifies the pause period in units of
sampling cycles.
Total pause cycle is
wPausePeriod
plus 1.
bTimeConstant
This is a 1-byte field which indicates the
Time Constant
of the pause
period.
The Time Constant calculation is the same as described in Block
Type 1.
Block Type 4
This is a special block that specifies a
Marker
in the digitized sound data.
The
Block Header is organized as follows:
BYTE
bBlockID;
// == 4
BYTE
nBlockLen[3];
// 3-byte block length
WORD
wMarker;
// marker value
Here is a discussion of various fields:
bBlockID
The Block Type identifier is 4.
nBlockLen
Length of the block (in bytes), excluding the
bBlockID
and
nBlockLen
fields.
The value is 2.
wMarker
This is a 2-byte field which specifies the marker value.
The marker value
can be any value between 1 to 0FFFE hex inclusive.
The 0 and 0FFFF
hex values are reserved by the digitized sound drivers.