Update submodule（voicevox_core 0.16.4対応）

[yamachu]

This pull request introduces significant enhancements to the singing synthesis functionality and error handling in the VoicevoxCoreSharp Unity bindings. The main changes include adding new error codes, validation APIs for musical data types, and new methods for frame-based singing synthesis. These updates improve robustness and expand the API to support more advanced singing features.

Singing synthesis and musical data validation enhancements

• Added new native APIs in CoreUnsafe.g.cs for validating Score, Note, FrameAudioQuery, and FramePhoneme JSON inputs, as well as for checking compatibility between musical score and audio query data. This improves error detection and data integrity for singing synthesis workflows.
• Introduced new APIs for frame-based singing synthesis: creating a singing frame audio query, generating per-frame fundamental frequency (f0) and volume, and synthesizing singing audio from frame queries. These methods enable more granular control over singing synthesis.

Error code and result handling improvements

• Added new error codes (RESULT_INVALID_SCORE_ERROR, RESULT_INVALID_NOTE_ERROR, RESULT_INVALID_FRAME_AUDIO_QUERY_ERROR, RESULT_INVALID_FRAME_PHONEME_ERROR) to the ResultCode enum and mapped them in conversion methods, allowing for more precise error reporting for invalid musical data. [1] [2] [3] [4]

Documentation and memory management updates

• Updated documentation for memory management APIs to reference new singing synthesis and query creation methods, ensuring users know how to properly free resources created by these new APIs. [1] [2]

Submodule update

• Updated the voicevox_core submodule to a newer commit, likely to support the new singing and validation features.

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These changes collectively strengthen the singing synthesis capabilities and error handling in the Unity bindings, making the library more robust and feature-rich for musical applications.

[Copilot]

Pull request overview

This pull request updates the voicevox_core submodule to version 0.16.4 and adds comprehensive singing synthesis capabilities to VoicevoxCoreSharp. The update introduces new validation APIs for musical data, frame-based singing synthesis methods, and corresponding error codes to improve robustness and enable advanced singing features.

Changes:

• Added four new error codes for validating Score, Note, FrameAudioQuery, and FramePhoneme data types
• Implemented validation methods for musical data structures and compatibility checking between scores and audio queries
• Introduced frame-based singing synthesis APIs for creating queries, generating f0/volume data, and synthesizing audio
• Updated documentation for memory management functions to reference new singing synthesis methods

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/VoicevoxCoreSharp.Core.Tests/SynthesizerTest.cs	Added comprehensive test for singing synthesis workflow
src/VoicevoxCoreSharp.Experimental/SynthesizerExtensions.cs	Added async extension methods for new singing synthesis APIs
src/VoicevoxCoreSharp.Core/VoicevoxCoreSharp.Core.Metas.props	Updated voicevox_core commit hash to new version
src/VoicevoxCoreSharp.Core/Utils.cs	Added validation methods for Score, Note, FrameAudioQuery, FramePhoneme, and compatibility checking
src/VoicevoxCoreSharp.Core/Synthesizer.cs	Implemented frame-based singing synthesis methods and refactored TtsFromKana indentation
src/VoicevoxCoreSharp.Core/Native/CoreUnsafe.g.cs	Added native P/Invoke declarations for validation and singing synthesis APIs, updated documentation
src/VoicevoxCoreSharp.Core/Enum/ResultCode.cs	Added four new error code enum values and mapping logic
src/VoicevoxCoreSharp.Core.Unity/Runtime/Script/Utils.cs	Unity version of validation methods for musical data types
src/VoicevoxCoreSharp.Core.Unity/Runtime/Script/Synthesizer.cs	Unity version of singing synthesis methods and TtsFromKana refactoring
src/VoicevoxCoreSharp.Core.Unity/Runtime/Script/Native/CoreUnsafe.g.cs	Unity version of native API declarations and documentation updates
src/VoicevoxCoreSharp.Core.Unity/Runtime/Script/Enum/ResultCode.cs	Unity version of new error codes and mappings
binding/voicevox_core	Updated submodule to cbb5ef8e292fc63d22e23e19dca521b48c1a950c

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