WRID>RIFF-WAVE>inst
TODO: overview
The WAVE form is NEARLY the perfect file format for storing a sampled sound synthesizer's samples. Bits per sample, sample rate, number of channels, and complex looping can be specified with current WAVE subchunks, but a sample's pitch and its desired volume relative to other samples cannot. The optional instrument subchunk defined below fills in these needed parameters
[RIFF1994]
| Chunk | Name | Bytes | Type | condition | Description | WRID |
|---|---|---|---|---|---|---|
| inst | id |
4 |
u8[4] |
id = "inst"
|
...>id | |
| inst | size |
4 |
u32 |
|
...>size | |
| inst | unshifted_note |
1 |
u8 |
|
MIDI note number that corresponds to the unshifted pitch of the sample. Valid values range from 0 to 127. | ...>unshifted_note |
| inst | fine_tune |
1 |
i8 |
|
Pitch shift adjustment in cents (or 100ths of a semitone) needed to hit unshifted_note value exactly. fine_tune can be used to compensate for tuning errors in the sampling process. Valid values range from -50 to 50. |
...>fine_tune |
| inst | gain |
1 |
i8 |
|
Suggested volume setting for the sample in decibels. A value of zero decibels suggests no change in the volume. A value of -6 decibels suggests reducing the amplitude of the sample by two. | ...>gain |
| inst | low_note |
1 |
u8 |
|
Suggested usable MIDI note number range of the sample. Valid values range from 0 to 127. | ...>low_note |
| inst | high_note |
1 |
u8 |
|
Suggested usable MIDI note number range of the sample. Valid values range from 0 to 127. | ...>high_note |
| inst | low_velocity |
1 |
u8 |
|
Suggested usable MIDI velocity range of the sample. Valid values range from 0 to 127. | ...>low_velocity |
| inst | high_velocity |
1 |
u8 |
|
Suggested usable MIDI velocity range of the sample. Valid values range from 0 to 127. | ...>high_velocity |
Learning References
Specification
- [RIFF1994] New Multimedia Data Types and Data Techniques (1994). See pages 12-22.