This document is about the format of Banner's CTR Wave files (BCWAV).
The structure is very similar to Microsoft's Wave file.
Banner CWAV total channels must be 2, and the length of the audio in seconds must be 3 seconds or less.
Overview
Microsoft's WAV structure is RIFF Header which defines the data inside which is WAVE, then the media player expects a "fmt " chunk and a "data" chunk. Nintendo's format uses a CWAV header (no need for a general structure for media, only wave), which points to an INFO struct (the equivalent to fmt) and a DATA struct (the equivalent to data).
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Magic (CWAV)
|
| 0x004 |
2 |
Endianness (0xFEFF = little, 0xFFFE = big)
|
| 0x006 |
2 |
Header Size (0x40 due to Info Block alignment)
|
| 0x008 |
4 |
Version (0x02010000)
|
| 0x00C |
4 |
File Size
|
| 0x010 |
2 |
Number of Blocks (2)
|
| 0x012 |
2 |
Reserved
|
| 0x014 |
12 |
Info Block Sized Reference (Offset relative to start of file)
|
| 0x020 |
12 |
Data Block Sized Reference (Offset relative to start of file)
|
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Magic
|
| 0x004 |
4 |
Size
|
Block Types
Info Block
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
8 |
Block Header
|
| 0x008 |
1 |
Encoding
|
| 0x009 |
1 |
Loop (0 = don't loop, 1 = loop)
|
| 0x00A |
2 |
Padding
|
| 0x00C |
4 |
Sample Rate
|
| 0x010 |
4 |
Loop Start Frame
|
| 0x014 |
4 |
Loop End Frame
|
| 0x018 |
4 |
Reserved
|
| 0x01C |
4 + Count * 8 |
Channel Info Reference Table
|
The info block is aligned to 0x20 bytes.
Data Block
The data block is aligned to 0x20 bytes, as well as the data field's actual sample data.
Encoding
| VALUE |
DESCRIPTION
|
| 0 |
PCM8
|
| 1 |
PCM16
|
| 2 |
DSP ADPCM
|
| 3 |
IMA ADPCM
|
Channel Info
DSP ADPCM Info
DSP ADPCM Param
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
32 |
16-bit Coefficients
|
DSP ADPCM Context
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
1 |
4-bit Predictor + 4-bit Scale
|
| 0x001 |
1 |
Reserved
|
| 0x002 |
2 |
Previous Sample
|
| 0x004 |
2 |
Second Previous Sample
|
IMA ADPCM Info
IMA ADPCM Context
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
2 |
Data
|
| 0x002 |
1 |
Table Index
|
| 0x003 |
1 |
Padding
|
Reference Table
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Count
|
| 0x004 |
Count * 8 |
References (Offsets relative to Count field)
|
Sized Reference
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
8 |
Reference
|
| 0x008 |
4 |
Size
|
Reference
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
2 |
Type ID
|
| 0x002 |
2 |
Padding
|
| 0x004 |
4 |
Offset ("null" = 0xFFFFFFFF)
|
Reference Types