Difference between revisions of "BCWAV"
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| 0x0301 || [[BCWAV#IMA ADPCM Info|IMA ADPCM Info]] | | 0x0301 || [[BCWAV#IMA ADPCM Info|IMA ADPCM Info]] | ||
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| + | | 0x1F00 || [[BCWAV#Data_Block|Sample Data]] | ||
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| 0x7000 || [[BCWAV#Info Block|Info Block]] | | 0x7000 || [[BCWAV#Info Block|Info Block]] | ||
Revision as of 04:53, 9 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 Wave structure is RIFF Header which defines the data inside which is WAVE.
then the media player expects "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) |
| 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) |
| 0x02C | 20 | Padding |
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 | 4 + Count * 8 | Channel Info Reference Table |
Data Block
| OFFSET | SIZE | DESCRIPTION |
|---|---|---|
| 0x000 | 8 | Block Header |
| 0x008 | Block Header Size - 8 | Data |
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 Channel Info start) |
| 0x010 | 4 | Reserved |
DSP ADPCM Info
| OFFSET | SIZE | DESCRIPTION |
|---|---|---|
| 0x000 | 32 | Param |
| 0x020 | 6 | Context |
| 0x026 | 6 | Loop Context |
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 |
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 |
Reference Types
| ID | TYPE |
|---|---|
| 0x0300 | DSP ADPCM Info |
| 0x0301 | IMA ADPCM Info |
| 0x1F00 | Sample Data |
| 0x7000 | Info Block |
| 0x7001 | Data Block |
| 0x7100 | Channel Info |