[Fix] fix input_audio wrong prefix (modelscope/evalscope#1152)

[labAxiaoming]

解决 vllm 跑 audio 数据集，前缀问题

#1152
vllm-project/vllm#32636

[gemini-code-assist]

Summary of Changes

Hello @labAxiaoming, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical issue where audio data was being sent with an incorrect prefix when processed for input_audio parameters, specifically impacting compatibility with vllm for audio datasets. The change involves switching the data processing utility to ensure the input_audio parameter receives correctly formatted base64 data, thereby enabling proper functionality.

Highlights

• Audio Data Processing Fix: The openai_chat_completion_part function was updated to correctly handle audio data. The previous file_as_data_uri call, which caused an incorrect prefix, has been replaced with data_uri_to_base64. This ensures that the input_audio parameter receives properly formatted base64 encoded data, resolving compatibility issues with vllm.
• New Utility Import: The data_uri_to_base64 function has been imported from evalscope.utils.url_utils to support the revised audio data processing logic.

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[gemini-code-assist]

Code Review

您好，感谢您的贡献。本次变更旨在修复 input_audio 错误的前缀问题。通过将 file_as_data_uri 替换为 data_uri_to_base64 来移除 data URI 的前缀。然而，这个修改引入了一个潜在的 bug：当 content.audio 是文件路径而非 data URI 时，data_uri_to_base64 会直接返回文件路径，而不是预期的 base64 编码数据。我已在代码中提出了修改建议，以确保在移除前缀之前，文件路径能被正确地转换为 data URI。

[Yunnglin]

LGTM! Thanks for the contribution. Merging now.