WRID>RIFF-WAVE>cue
Note: all chunks are four bytes.
MD5is"MD5 ". The last character is a space (ASCII 32).
TODO: overview
... cue-points chunk identifies a series of positions in the waveform data stream.
[RIFF1991]
| Chunk | Group | Name | Bytes | Type | condition | Description | WRID |
|---|---|---|---|---|---|---|---|
| cue | id |
4 |
u8[4] |
id = "cue "
|
...>id | ||
| cue | size |
4 |
u32 |
|
...>size | ||
| cue | cue_points |
4 |
u32 |
|
Count of cue points. The number of times the cue-point struct repeats within this chunk. | ...>cue_points | |
| cue | cue_point | name |
4 |
u32 |
|
cue-point field: Specifies the cue point name. Each |
...>name |
| cue | cue_point | position |
4 |
u32 |
|
cue-point field: Specifies the sample position of the cue point. This is the sequential sample number within the play order. See plst chunk, for a discussion of the play order. |
...>position |
| cue | cue_point | chunk_id |
4 |
u8[4] |
|
cue-point field: Specifies the name or chunk ID of the chunk containing the cue point. | ...>chunk_id |
| cue | cue_point | chunk_start |
4 |
u32 |
|
cue-point field: Specifies the file position of the start of the chunk containing the cue point. This is a byte offset relative to the start of the data section of the ‘wavl’ LIST chunk. | ...>chunk_start |
| cue | cue_point | block_start |
4 |
u32 |
|
cue-point field: Specifies the file position of the start of the block containing the position. This is a byte offset relative to the start of the data section of the ‘wavl’ LIST chunk. | ...>block_start |
| cue | cue_point | sample_offset |
4 |
u32 |
|
cue-point field: Specifies the sample offset of the cue point relative to the start of the block. | ...>sample_offset |
All fields where Repeat Group = cue_point repeat cue_points times as a group (struct).
Usage
- See the "Cue-Points Chunk", "Examples of File Position Values" section of [RIFF1991]
for basic information on interpreting the cue-point values. However, it doesn't clearly specify some things. For example: is
sample_offseta byte offset, or a "frame" offset (sample rate * channels).
Learning References
Specification
- [RIFF1991] Multimedia Programming Interface and Data Specifications (1991). See pages 56-65.
- [RIFF1994] New Multimedia Data Types and Data Techniques (1994). See pages 12-22.