Using Camera Interface

Camera Interface Usage Guide

When implementing camera functionality in sl-experiment, use the ataraxis-video-system library following the patterns established in this codebase.

See CAMERA_INTERFACE_GUIDE.md for complete API reference and integration patterns.

IMPORTANT: Verification Requirement

Before writing any camera code, you MUST verify the current state of the dependent libraries. The documentation in this skill may be outdated.

Step 0: Version Verification

Follow the Cross-Referenced Library Verification procedure in CLAUDE.md to ensure local copies of ataraxis-video-system and sl-shared-assets are up to date with their GitHub repositories. If version mismatches exist, ask the user how to proceed before continuing.

Content Verification

After version verification, perform the following content checks:

1. Verify ataraxis-video-system

• Read README.md in /home/cyberaxolotl/Desktop/GitHubRepos/ataraxis-video-system/ for current usage instructions
• Read examples in /home/cyberaxolotl/Desktop/GitHubRepos/ataraxis-video-system/examples/ for recommended patterns
• Read src/ataraxis_video_system/__init__.py to confirm exported classes and functions
• Read src/ataraxis_video_system/video_system.py to verify VideoSystem constructor parameters and methods
• Check pyproject.toml in sl-experiment for the current version dependency

2. Verify sl-shared-assets

• Read README.md in /home/cyberaxolotl/Desktop/GitHubRepos/sl-shared-assets/ for current conventions
• Read src/sl_shared_assets/data_classes/configuration_data.py to confirm camera configuration patterns
• Verify AcquisitionSystems enum members for existing systems
• Check existing camera dataclasses (e.g., MesoscopeCameras) for current field conventions
• Review __init__.py exports to understand public API

3. Verify sl-experiment binding patterns

• Read src/sl_experiment/mesoscope_vr/binding_classes.py to confirm current VideoSystems implementation
• Check for any new patterns or conventions introduced since this skill was written

If any discrepancies are found between this guide and the actual library state, follow the current library implementation rather than this documentation.

Decision Logic

Does the acquisition system already have a binding class?
│
├─ YES → Add camera wrapper to existing binding_classes.py
│
└─ NO  → Create full binding hierarchy (see de-novo system guide)

Existing binding classes: src/sl_experiment/mesoscope_vr/binding_classes.py

Quick Reference

Core Import

from ataraxis_video_system import (
    VideoSystem,
    VideoEncoders,
    CameraInterfaces,
    OutputPixelFormats,
    EncoderSpeedPresets,
)

VideoSystem Instantiation

camera = VideoSystem(
    system_id=np.uint8(51),
    data_logger=logger,
    output_directory=output_path,
    camera_interface=CameraInterfaces.HARVESTERS,
    camera_index=camera_config.camera_index,
    display_frame_rate=25,
    video_encoder=VideoEncoders.H265,
    gpu=0,
    encoder_speed_preset=EncoderSpeedPresets(camera_config.preset),
    output_pixel_format=OutputPixelFormats.YUV420,
    quantization_parameter=camera_config.quantization,
)

Lifecycle Pattern

camera.start()              # Begin frame acquisition
camera.start_frame_saving() # Begin recording to disk
# ... acquisition runs ...
camera.stop_frame_saving()  # Stop recording
camera.stop()               # Release resources

sl-shared-assets Requirements

Camera configuration must be defined in sl-shared-assets before sl-experiment implementation.

For existing systems: Add camera dataclass if not present For de-novo systems: Create full configuration hierarchy

Required Configuration Classes

# sl-shared-assets/src/sl_shared_assets/data_classes/configuration_data.py

@dataclass()
class YourSystemCameras:
    camera_index: int = 0
    camera_quantization: int = 20  # 0-51, lower = better
    camera_preset: int = 7         # 0-5, maps to EncoderSpeedPresets

System Configuration Container

@dataclass()
class YourSystemConfiguration(YamlConfig):
    cameras: YourSystemCameras = field(default_factory=YourSystemCameras)
    # ... other components

Existing Integration

See src/sl_experiment/mesoscope_vr/binding_classes.py for the VideoSystems wrapper class that manages face and body cameras in this codebase.

System ID Allocation

Current: 51 (face), 62 (body)