Difference between revisions of "BCWAV"
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Revision as of 04:39, 10 December 2015
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).
Header
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) |
Block Header
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 4 | Magic |
0x004 | 4 | Size |
Block Types
MAGIC | TYPE |
---|---|
INFO | Info Block |
DATA | Data Block |
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 | X | Channel Info Reference Table |
X | X | Channel Info Entries |
If encoding is DSP ADPCM:
OFFSET | SIZE | DESCRIPTION |
---|---|---|
X | X | DSP ADPCM Info Entries |
If encoding is IMA ADPCM:
OFFSET | SIZE | DESCRIPTION |
---|---|---|
X | X | IMA ADPCM Info Entries |
The info block is aligned to 0x20 bytes.
Encoding
VALUE | DESCRIPTION |
---|---|
0 | PCM8 |
1 | PCM16 |
2 | DSP ADPCM |
3 | IMA ADPCM |
Channel Info
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 8 | Samples Reference (Offset relative to Data Block Data field) |
0x008 | 8 | ADPCM Info Reference (Offset relative to Samples Reference field) |
0x010 | 4 | Reserved |
DSP ADPCM Info
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 32 | Param |
0x020 | 6 | Context |
0x026 | 6 | Loop Context |
0x02C | 2 | Padding |
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
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 4 | Context |
0x004 | 4 | Loop Context |
IMA ADPCM Context
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 2 | Data |
0x002 | 1 | Table Index |
0x003 | 1 | Padding |
Data Block
OFFSET | SIZE | DESCRIPTION |
---|---|---|
0x000 | 8 | Block Header |
0x008 | Block Header Size Value - 8 | Data |
The data block is aligned to 0x20 bytes, as well as the data field's actual sample data.
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
ID | TYPE |
---|---|
0x0300 | DSP ADPCM Info |
0x0301 | IMA ADPCM Info |
0x1F00 | Sample Data |
0x7000 | Info Block |
0x7001 | Data Block |
0x7100 | Channel Info |