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# XMA2STREAMFORMAT

> XMA2STREAMFORMAT

Used in XMA2WAVEFORMAT for per-stream data.

## Syntax

```cpp theme={null}
typedef struct XMA2STREAMFORMAT {  
    BYTE Channels;  
    BYTE RESERVED;  
    WORD ChannelMask;  
} XMA2STREAMFORMAT  
```

### Members

*Channels*\
Type: BYTE

Number of channels (1 or 2) in the stream.

*RESERVED*\
Type: BYTE

Reserved.

*ChannelMask*\
Type: WORD

Spatial positions of the channels in the stream.

The least-significant bit corresponds to the front-left speaker, the next least-significant bit corresponds to the front-right speaker, and so on. The bits, in the order of significance, are defined as follows.

| Speaker position | Flag bit |
| - | - |
| SPEAKER\_FRONT\_LEFT | 0x1 |
| SPEAKER\_FRONT\_RIGHT | 0x2 |
| SPEAKER\_FRONT\_CENTER | 0x4 |
| SPEAKER\_LOW\_FREQUENCY | 0x8 |
| SPEAKER\_BACK\_LEFT | 0x10 |
| SPEAKER\_BACK\_RIGHT | 0x20 |
| SPEAKER\_FRONT\_LEFT\_OF\_CENTER | 0x40 |
| SPEAKER\_FRONT\_RIGHT\_OF\_CENTER | 0x80 |
| SPEAKER\_BACK\_CENTER | 0x100 |
| SPEAKER\_SIDE\_LEFT | 0x200 |
| SPEAKER\_SIDE\_RIGHT | 0x400 |
| SPEAKER\_TOP\_CENTER | 0x800 |
| SPEAKER\_TOP\_FRONT\_LEFT | 0x1000 |
| SPEAKER\_TOP\_FRONT\_CENTER | 0x2000 |
| SPEAKER\_TOP\_FRONT\_RIGHT | 0x4000 |
| SPEAKER\_TOP\_BACK\_LEFT | 0x8000 |
| SPEAKER\_TOP\_BACK\_CENTER | 0x10000 |
| SPEAKER\_TOP\_BACK\_RIGHT | 0x20000 |
| SPEAKER\_ALL | 0x80000000 (used to specify any possible permutation of speaker configurations) |

The following speaker configurations are defined.

| Speaker configuration | Flag bits set |
| - | - |
| KSAUDIO\_SPEAKER\_MONO | (SPEAKER\_FRONT\_CENTER) |
| KSAUDIO\_SPEAKER\_STEREO | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT) |
| KSAUDIO\_SPEAKER\_QUAD | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_BACK\_LEFT \| SPEAKER\_BACK\_RIGHT) |
| KSAUDIO\_SPEAKER\_SURROUND | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_FRONT\_CENTER \| SPEAKER\_BACK\_CENTER) |
| KSAUDIO\_SPEAKER\_5POINT1 | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_FRONT\_CENTER \| SPEAKER\_LOW\_FREQUENCY \| \ SPEAKER\_BACK\_LEFT \| SPEAKER\_BACK\_RIGHT) |
| KSAUDIO\_SPEAKER\_7POINT1 | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_FRONT\_CENTER \| SPEAKER\_LOW\_FREQUENCY \| \ SPEAKER\_BACK\_LEFT \| SPEAKER\_BACK\_RIGHT \| \ SPEAKER\_FRONT\_LEFT\_OF\_CENTER \| SPEAKER\_FRONT\_RIGHT\_OF\_CENTER) |
| KSAUDIO\_SPEAKER\_5POINT1\_SURROUND | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_FRONT\_CENTER \| SPEAKER\_LOW\_FREQUENCY \| \ SPEAKER\_SIDE\_LEFT \| SPEAKER\_SIDE\_RIGHT) |
| KSAUDIO\_SPEAKER\_7POINT1\_SURROUND | (SPEAKER\_FRONT\_LEFT \| SPEAKER\_FRONT\_RIGHT \| \ SPEAKER\_FRONT\_CENTER \| SPEAKER\_LOW\_FREQUENCY \| \ SPEAKER\_BACK\_LEFT \| SPEAKER\_BACK\_RIGHT \| \ SPEAKER\_SIDE\_LEFT \| SPEAKER\_SIDE\_RIGHT) |

The following DVD speaker positions are defined.

| Speaker position | Flag bit |
| - | - |
| KSAUDIO\_SPEAKER\_GROUND\_FRONT\_LEFT | SPEAKER\_FRONT\_LEFT |
| KSAUDIO\_SPEAKER\_GROUND\_FRONT\_CENTER | SPEAKER\_FRONT\_CENTER |
| KSAUDIO\_SPEAKER\_GROUND\_FRONT\_RIGHT | SPEAKER\_FRONT\_RIGHT |
| KSAUDIO\_SPEAKER\_GROUND\_REAR\_LEFT | SPEAKER\_BACK\_LEFT |
| KSAUDIO\_SPEAKER\_GROUND\_REAR\_RIGHT | SPEAKER\_BACK\_RIGHT |
| KSAUDIO\_SPEAKER\_TOP\_MIDDLE | SPEAKER\_TOP\_CENTER |
| KSAUDIO\_SPEAKER\_SUPER\_WOOFER | SPEAKER\_LOW\_FREQUENCY |

## Remarks

This structure is used in `XMA2WAVEFORMAT` for per-stream data. As shown in the code example below, `Channels` refer to the number of channels in the stream. `ChannelMask` is for spatial positions of the channels in the stream.

```cpp theme={null}
typedef struct XMA2STREAMFORMAT
{
    BYTE Channels;           // Number of channels in the stream (1 or 2)
    BYTE RESERVED;           // Reserved for future use
    WORD ChannelMask;        // Spatial positions of the channels in the stream
} XMA2STREAMFORMAT;

```

For more information about XMA2, see [Overview of XMA2](https://docs.xbox.com/build/console-features/audio/overviews/xma2-overview.md). For an overview of the audio architecture of XBOX One, see **The sound of the future**: [The audio architecture in XBOX One](https://docs.xbox.com/build/console-features/audio/overviews/xbox-one-audio-architecture.md).

## Requirements

**Header:** xma2defs.h

**Supported platforms:** XBOX One family consoles and XBOX Series consoles

## See also

[xma2defs](https://docs.xbox.com/reference/audio/xma2defs/xma2defs_members.md)


## Related topics

- [XMA2Defs](https://docs.xbox.com/reference/audio/xma2defs/xma2defs_members.md)
- [XMA2WAVEFORMAT](https://docs.xbox.com/reference/audio/xma2defs/structs/xma2waveformat.md)
- [XMA2WAVEFORMATEX](https://docs.xbox.com/reference/audio/xma2defs/structs/xma2waveformatex.md)
- [XMA2PACKET](https://docs.xbox.com/reference/audio/xma2defs/structs/xma2packet.md)
- [Overview of XMA2](https://docs.xbox.com/build/console-features/audio/overviews/xma2-overview.md)