# Change Request Summary: Assignment of IVAS Levels to Device Types

## CR Metadata
- **Document**: TS 26.119 v19.0.0
- **CR Number**: 0003 rev 1
- **Category**: A (mirror corresponding to a change in an earlier release)
- **Release**: Rel-19
- **Work Items**: MeCAR, IVAS_Codec
- **Source**: Dolby Laboratories Inc.

## Reason for Change

The specification currently contains placeholder notes indicating that IVAS capability levels would be assigned to XR device types once the IVAS capability levels were defined. Since IVAS capability levels have now been specified, this CR removes the placeholder notes and provides the actual assignment of IVAS capabilities to the different XR device types.

## Summary of Technical Changes

This CR updates the audio/speech capabilities support clauses for all four XR device types by:
1. Removing informative notes stating that IVAS level assignments would be refined later
2. Specifying concrete IVAS capability levels for each device type
3. Implementing the change by referencing IVAS decoding capabilities defined in TS 26.117

## Detailed Technical Contributions

### Device Type 1 Audio/Speech Capabilities (Clause 10.2.4)

**Decoding Capabilities:**
- Changed from generic "IVAS-SR" (with note) to specific **"IVAS-L1"** as a SHOULD requirement
- Removed placeholder note about future refinement

**Encoding Capabilities:**
- Maintains **"IVAS-L1"** as a SHOULD requirement
- Removed placeholder note about future refinement

### Device Type 2 Audio/Speech Capabilities (Clause 10.3.4)

**Decoding Capabilities:**
- Changed from generic "IVAS-SR" (with note) to specific **"IVAS-L1"** as a SHOULD requirement
- Removed placeholder note about future refinement

**Encoding Capabilities:**
- Maintains **"IVAS-L1"** as a SHOULD requirement
- Removed placeholder note about future refinement

### Device Type 3 Audio/Speech Capabilities (Clause 10.4.4)

**Decoding Capabilities:**
- Maintains generic **"IVAS"** as a SHOULD requirement (no level specified)
- Removed placeholder note about future refinement

**Encoding Capabilities:**
- Maintains generic **"IVAS"** as a SHOULD requirement (no level specified)
- Removed placeholder note about future refinement

### Device Type 4 Audio/Speech Capabilities (Clause 10.5.4)

**Decoding Capabilities:**
- Maintains generic **"IVAS"** as a SHOULD requirement (no level specified)
- Removed placeholder note about future refinement

**Encoding Capabilities:**
- Maintains generic **"IVAS"** as a SHOULD requirement (no level specified)
- Removed placeholder note about future refinement

## Related Specifications

This CR has a corresponding change in:
- **TS 26.117 CR 0014** (related specification for IVAS capabilities)

## Consequences if Not Approved

Without this CR, implementers would remain confused about which IVAS capability levels need to be implemented in AR/XR devices, as the specification would continue to contain only placeholder notes rather than normative requirements.

## Revision History

- **Initial version (SA4#134)**: Implemented the change with direct referencing of IVAS codec specifications
- **Rev 1 (SA4#135)**: Modified implementation to reference IVAS decoding capabilities in TS 26.117 instead of direct codec specification references