smp(4)smp(4)NAME
smp, SampleVision - Sample Vision Audio File Format
SYNOPSIS
#include <dmedia/audiofile.h>
DESCRIPTION
The Audio File Library currently supports 13 of the commonly found audio
file formats, i.e., is able to recognize, read, and write sample data and
header information to and from files in these formats. It is important
not to confuse sample or audio data formats with file formats. The
former refers to the bit-wise organization of the sound samples in the
file, i.e., whether the format is 8-bit integer or 16-bit unsigned, etc.
Audio file format refers to the structure of the audio file header, the
chunk of on-disk data which preceeds the samples and which provides
information about the file to the audio program. A single audio file
format may support a large variety of sample formats.
The Sample Vision File Format (smp) was developed for use with the Sample
Vision software program, which was designed to send and receive samples
via the MIDI interface on a PC. It consists of a variable-length header
followed by a contiguous block of binary data representing the sound
samples.
DATA FORMAT SPECIFICATIONS
Sample Formats:
Two's complement integer only.
Sample Widths:
16 bit only.
Byte Orders:
Always littleendian.
Channel Counts:
1 channel only.
Compression Formats:
None.
FILE FORMAT SPECIFICATIONS
SMP file headers contain additional information.
Instrument Configurations:
Maximum of 1 allowed. Up to eight loops are allowed. Instparams
associated with this inst: AF_INST_MIDI_BASENOTE only. See
afSetInstParamLong(3dm) for more information about these parameters.
Markers:
Unlike AIFF(3dm) and WAVE(3dm) files, there is no direct association
between markers and loops. However, for backwards compatibility, an
application may choose to specify loop start and end points via the
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traditional AIFF-style method using mark id's (afSetLoopStart(3dm),
etc.) or via the newer afSetLoopStartFrame(3dm) and related
routines. In the former case, both the loops and the markers will
be written out to the header; in the latter case, only the loops
will be written out (unless other markers have been created).
Miscellaneous Chunks:
AF_MISC_NAME name string
AF_MISC_COMMENT comment string
SEE ALSOafInitFileFormat(3dm), afGetFileFormat(3dm), afIntro(3dm),
afSetLoopStart(3dm), afSetLoopEnd(3dm)
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