This document is about the format of CTR Streams (CSTM).
Overview
The structure is similar to that of a BCWAV, with a few differences, such as its different INFO block format, the addition of a SEEK block, and the organization of the DATA block samples into blocks.
These files are either found in rom:\sound\stream\ or they can be inside of a CSAR.
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Magic (CSTM)
|
| 0x004 |
2 |
Endianness (0xFEFF = little, 0xFFFE = big)
|
| 0x006 |
2 |
Header Size (0x40 due to Info Block alignment)
|
| 0x008 |
4 |
Version (0x02000000)
|
| 0x00C |
4 |
File Size
|
| 0x010 |
2 |
Number of Blocks (3)
|
| 0x012 |
2 |
Reserved
|
| 0x014 |
12 |
Info Block Sized Reference (Offset relative to start of file)
|
| 0x020 |
12 |
Seek Block Sized Reference (Offset relative to start of file)
|
| 0x02C |
12 |
Data Block Sized Reference (Offset relative to start of file)
|
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Magic
|
| 0x004 |
4 |
Size
|
Block Types
Info Block
If encoding is DSP ADPCM:
If encoding is IMA ADPCM:
The info block is aligned to 0x20 bytes.
Encoding
| VALUE |
DESCRIPTION
|
| 0 |
PCM8
|
| 1 |
PCM16
|
| 2 |
DSP ADPCM
|
| 3 |
IMA ADPCM
|
Stream Info
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
1 |
Encoding
|
| 0x001 |
1 |
Loop (0 = don't loop, 1 = loop)
|
| 0x002 |
1 |
Channel Count
|
| 0x003 |
1 |
Padding
|
| 0x004 |
4 |
Sample Rate
|
| 0x008 |
4 |
Loop Start Frame
|
| 0x00C |
4 |
Loop End Frame
|
| 0x010 |
4 |
Sample Block Count
|
| 0x014 |
4 |
Sample Block Size
|
| 0x018 |
4 |
Sample Block Sample Count
|
| 0x01C |
4 |
Last Sample Block Size
|
| 0x020 |
4 |
Last Sample Block Sample Count
|
| 0x024 |
4 |
Last Sample Block Padded Size
|
| 0x028 |
4 |
Seek Data Size
|
| 0x02C |
4 |
Seek Interval Sample Count
|
| 0x030 |
8 |
Sample Data Reference (Offset relative to Data Block Data field)
|
Track Info
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
1 |
Volume
|
| 0x001 |
1 |
Pan
|
| 0x002 |
2 |
Padding
|
| 0x004 |
8 |
Channel Index Byte Table Reference (Offset relative to Volume field)
|
| 0x00C |
X |
Channel Index Byte Table (Padded to 4 bytes)
|
Byte Table
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
4 |
Count
|
| 0x004 |
Count |
Elements
|
Channel Info
| OFFSET |
SIZE |
DESCRIPTION
|
| 0x000 |
8 |
ADPCM Info Reference (Offset relative to this field)
|
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
|
Seek Block
The seek 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.
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