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[[Category:File formats]]
[[Category:File formats]]
This document is about the format of CTR Streams (CSTM).
This document is about the format of CTR Streams (CSTM).
The structure is almost exact to the CTR Wave Format (CWAV).


=== Overview ===
=== Overview ===


The structure of the CSTM is almost exactly the CWAV, except a few differences. The formats can be easily converted between eachother.
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.
These files are either found in rom:\sound\stream\ or they can be inside of a CSAR.


=== Format ===
=== Header ===
 
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 4 || Magic (CSTM)
|-
| 0x004 || 2 || Endianness (0xFEFF = little, 0xFFFE = big)
|-
| 0x006 || 2 || Header Size (0x40 due to [[#Info Block|Info Block]] alignment)
|-
| 0x008 || 4 || Version (0x02000000)
|-
| 0x00C || 4 || File Size
|-
| 0x010 || 2 || Number of Blocks (3)
|-
| 0x012 || 2 || Reserved
|-
| 0x014 || 12 || [[#Info Block|Info Block]] [[#Sized Reference|Sized Reference]] (Offset relative to start of file)
|-
| 0x020 || 12 || [[#Seek Block|Seek Block]] [[#Sized Reference|Sized Reference]] (Offset relative to start of file)
|-
| 0x02C || 12 || [[#Data Block|Data Block]] [[#Sized Reference|Sized Reference]] (Offset relative to start of file)
|}


The structure is very similar to the CWAV, except these notable differences :
=== Block Header ===


{| class="wikitable" border="1"
{| class="wikitable" border="1"
Line 18: Line 41:
! OFFSET !! SIZE !!  DESCRIPTION
! OFFSET !! SIZE !!  DESCRIPTION
|-
|-
| 0x000 || 4 || MAGIC "CSTM"
| 0x000 || 4 || Magic
|-
|-
| 0x004 || 4 || Size
|}
|}


Additionally it introduces a new partition called SEEK which comes right before DATA, so a CSTM would be ordered like this:
==== Block Types ====
 
{| class="wikitable" border="1"
|-
! MAGIC !! TYPE
|-
| INFO || [[#Info Block|Info Block]]
|-
| SEEK || [[#Seek Block|Seek Block]]
|-
| DATA || [[#Data Block|Data Block]]
|}
 
=== Info Block ===
 
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 8 || [[#Block Header|Block Header]]
|-
| 0x008 || 8 || [[#Stream Info|Stream Info]] [[#Reference|Reference]] (Offset relative to this field)
|-
| 0x010 || 8 || [[#Track Info|Track Info]] [[#Reference Table|Reference Table]] [[#Reference|Reference]] (Offset relative to [[#Stream Info|Stream Info]] [[#Reference|Reference]] field)
|-
| 0x018 || 8 || [[#Channel Info|Channel Info]] [[#Reference Table|Reference Table]] [[#Reference|Reference]] (Offset relative to [[#Stream Info|Stream Info]] [[#Reference|Reference]] field)
|-
| 0x020 || 56 || [[#Stream Info|Stream Info]]
|-
| 0x058 || X || [[#Track Info|Track Info]] [[#Reference Table|Reference Table]]
|-
| X || X || [[#Channel Info|Channel Info]] [[#Reference Table|Reference Table]]
|-
| X || X || [[#Track Info|Track Info]] Entries
|-
| X || X || [[#Channel Info|Channel Info]] Entries
|}


* CSTM Header
If encoding is DSP ADPCM:
* INFO Partition
* SEEK Partition
* DATA Partition


By default this means that 0x24-0x2B in the CSTM Partition is the SEEK position and length respectively, and DATA position and length follows it. (in a CWAV 0x24-0x2B is usually the DATA position and length)
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| X || X || [[#DSP ADPCM Info|DSP ADPCM Info]] Entries
|}


=== SEEK ===
If encoding is IMA ADPCM:


{| class="wikitable" border="1"
{| class="wikitable" border="1"
Line 37: Line 99:
! OFFSET !! SIZE !!  DESCRIPTION
! OFFSET !! SIZE !!  DESCRIPTION
|-
|-
| 0x000 || 4 || Magic (SEEK)
| X || X || [[#IMA ADPCM Info|IMA ADPCM Info]] Entries
|}
 
The info block is aligned to 0x20 bytes.
 
==== Encoding ====
 
{| class="wikitable" border="1"
|-
! VALUE !! DESCRIPTION
|-
| 0 || PCM8
|-
|-
| 0x004 || 4 || Length
| 1 || PCM16
|-
| 2 || DSP ADPCM
|-
| 3 || IMA ADPCM
|}
|}
==== Stream Info ====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 1 || [[#Encoding|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|Reference]] (Offset relative to [[#Data Block|Data Block]] Data field)
|}
==== Track Info ====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 1 || Volume
|-
| 0x001 || 1 || Pan
|-
| 0x002 || 2 || Padding
|-
| 0x004 || 8 || Channel Index [[#Byte Table|Byte Table]] [[#Reference|Reference]] (Offset relative to Volume field)
|-
| 0x00C || X || Channel Index [[#Byte Table|Byte Table]] (Padded to 4 bytes)
|}
===== Byte Table =====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 4 || Count
|-
| 0x004 || Count || Elements
|}
==== Channel Info ====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 8 || ADPCM Info [[#Reference|Reference]]  (Offset relative to this field)
|}
===== DSP ADPCM Info =====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 32 || [[#DSP ADPCM Param|Param]]
|-
| 0x020 || 6 || [[#DSP ADPCM Context|Context]]
|-
| 0x026 || 6 || Loop [[#DSP ADPCM Context|Context]]
|-
| 0x02C || 2 || Padding
|}
====== DSP ADPCM Param ======
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 32 || 16-bit Coefficients
|}
====== DSP ADPCM Context ======
{| class="wikitable" border="1"
|-
! 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 =====
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 4 || [[#IMA ADPCM Context|Context]]
|-
| 0x004 || 4 || Loop [[#IMA ADPCM Context|Context]]
|}
====== IMA ADPCM Context ======
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 2 || Data
|-
| 0x002 || 1 || Table Index
|-
| 0x003 || 1 || Padding
|}
=== Seek Block ===
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 8 || [[#Block Header|Block Header]]
|-
| 0x008 || [[#Block Header|Block Header]] Size Value - 8 || Data
|}
The seek block is aligned to 0x20 bytes.
=== Data Block ===
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 8 || [[#Block Header|Block Header]]
|-
| 0x008 || [[#Block Header|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 ===
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 4 || Count
|-
| 0x004 || Count * 8 || [[#Reference|References]] (Offsets relative to Count field)
|}
=== Sized Reference ===
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 8 || [[#Reference|Reference]]
|-
| 0x008 || 4 || Size
|}
=== Reference ===
{| class="wikitable" border="1"
|-
! OFFSET !! SIZE !!  DESCRIPTION
|-
| 0x000 || 2 || Type ID
|-
| 0x002 || 2 || Padding
|-
| 0x004 || 4 || Offset ("null" = 0xFFFFFFFF)
|}
==== Reference Types ====
{| class="wikitable" border="1"
|-
! ID !! TYPE
|-
| 0x0100 || [[#Byte Table|Byte Table]]
|-
| 0x0101 || [[#Reference Table|Reference Table]]
|-
| 0x0300 || [[#DSP ADPCM Info|DSP ADPCM Info]]
|-
| 0x0301 || [[#IMA ADPCM Info|IMA ADPCM Info]]
|-
| 0x1F00 || [[#Data_Block|Sample Data]]
|-
| 0x4000 || [[#Info Block|Info Block]]
|-
| 0x4001 || [[#Seek Block|Seek Block]]
|-
| 0x4002 || [[#Data Block|Data Block]]
|-
| 0x4100 || [[#Stream Info|Stream Info]]
|-
| 0x4101 || [[#Track Info|Track Info]]
|-
| 0x4102 || [[#Channel Info|Channel Info]]
|}
==Tools==
The following tools can play BCSTMs and convert them to other formats:
* [https://gota7.github.io/Citric-Composer/ Isabelle Sound Editor]
* vgmstream
* Every File Explorer
Retrieved from "https://www.3dbrew.org/wiki/BCSTM"