Replace callback-based audio streaming with iterator pattern

[Copilot]

AudioClient.transcribe_streaming required a callback argument, inconsistent with ChatClient.complete_streaming_chat which returns a Generator. Align the audio client to the same iterator pattern used across the SDK.

Changes

• audio_client.py: Replace transcribe_streaming(path, callback) -> None with transcribe_streaming(path) -> Generator[AudioTranscriptionResponse] using the same threading.Thread + queue.Queue + sentinel pattern from ChatClient._stream_chunks
• test_audio_client.py: Update streaming tests to for chunk in consumption; remove test_should_raise_for_streaming_invalid_callback (no longer applicable)
• test/README.md: Update test counts (7→6 audio, 32→31 total)

Usage

# Before
def on_chunk(chunk):
    print(chunk.text)
audio_client.transcribe_streaming("recording.mp3", on_chunk)

# After
for chunk in audio_client.transcribe_streaming("recording.mp3"):
    print(chunk.text)

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Project	Deployment	Actions	Updated (UTC)
foundry-local	Ready	Preview, Comment	Apr 6, 2026 8:51pm

[Copilot]

Pull request overview

Aligns the Python AudioClient.transcribe_streaming API with the SDK’s iterator-based streaming pattern (matching ChatClient.complete_streaming_chat) by switching from a required callback to a returned generator.

Changes:

• Refactor transcribe_streaming to return a Generator[AudioTranscriptionResponse] backed by a background thread + queue + sentinel.
• Update audio streaming tests to consume streaming output via for chunk in ... and remove the invalid-callback test.
• Update Python test suite README test counts to reflect the removed test.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
sdk/python/src/openai/audio_client.py	Replaces callback-based streaming with a generator-based streaming implementation using a thread/queue pattern.
sdk/python/test/openai/test_audio_client.py	Updates streaming tests to iterate over the generator; removes callback validation test.
sdk/python/test/README.md	Updates listed audio/total test counts after removing one test.

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