Feature change monitor

[rogertje50]

Add --drm-vout-display Parameter for Selecting Specific DRM Outputs

This pull request introduces a new command-line parameter, --drm-vout-display, to allow users to specify the desired DRM output display when running Flutter applications on Raspberry Pi.

This change is implemented in response to issue #201.

Supported Options

The supported values for this parameter are:

• HDMI-A-1
• HDMI-A-2
• DSI-1
• DSI-2

If the --drm-vout-display parameter is not provided, the code will behave as before, automatically selecting the first available connected display.

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Key Changes

New Command-Line Argument

• Added the --drm-vout-display option to the command-line arguments.
• Users can now specify the desired display output by providing one of the supported values.

Validation and Parsing

• The provided value is validated against the supported options (HDMI-A-1, HDMI-A-2, DSI-1, DSI-2).
• The flutterpi struct now includes a drm_vout_display field to store the selected display.

Behavior

• If a valid display is specified, the code will attempt to use the corresponding DRM connector type and type ID.
• If no display is specified, the code defaults to the previous behavior of selecting the first available connected display.

Documentation

• Updated the --help output to include the new --drm-vout-display option.
• The supported values are based on the Raspberry Pi documentation: Playing Audio and Video.

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Example Usage

flutter-pi --drm-vout-display HDMI-A-1

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Backward Compatibility

This change is fully backward-compatible. If the --drm-vout-display parameter is not provided, the application will function as it did previously, automatically selecting the first available connected display.

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Motivation

This feature provides users with greater control over which display output is used, especially in multi-display setups or when specific outputs are required for certain use cases.

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