fix(gemini): preserve inline media response parts - #1344
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WalkthroughGemini inline image parts are converted to OpenAI-compatible ChangesGemini inline image support
Suggested reviewers: Merge Risk: 🔵 Low · up to The PR preserves Gemini inline images as data URLs in both standard and streaming responses, preventing media loss for image-only and mixed responses. It is mergeable with owner awareness of a small type-safety and maintainability issue in the media conversion code. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description includes the required sections, issue reference, change summary, testing details, checklist, and AI usage information. It also discloses that the full provider test run did not complete. Full details: Linked Issues checkExplanation The implementation addresses the main requirements in issue Resolution Fix the inline_data validation so non-Blob or non-bytes mock values cannot cause a TypeError, or update the affected mocks to set inline_data = None. Re-run the affected existing tests and the relevant provider test suite until they pass or document an accepted compatibility decision with evidence from the issue owner. Full details: Out of Scope Changes checkExplanation The changes remain within scope for issue ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/any_llm/providers/gemini/utils.py`:
- Around line 368-380: Update _inline_data_image to return None unless
blob.mime_type starts with "image/", while preserving the existing validation
and image URL conversion for image MIME types.
- Line 495: Add a shared image-entry type and declare an optional images field
on both ChatCompletionMessage and ChoiceDelta, ensuring the existing Gemini
response construction and typed consumer access remain compatible.
In `@tests/unit/providers/test_gemini_provider.py`:
- Around line 951-962: Add standalone streaming tests for
_create_openai_chunk_from_google_chunk covering an inline PNG, asserting
chunk.choices[0].delta.images contains the expected data URL, plus cases where
inline image data is None and mime_type is None to exercise both guard paths.
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Inline comments:
In `@src/any_llm/providers/gemini/utils.py`:
- Around line 372-373: Update the blob validation in _inline_data_image to
reject empty byte data as well as None, while preserving valid image payload
handling and existing MIME-type checks. Extend
test_convert_response_skips_inline_data_without_image_payload with an empty-data
case covering this branch.
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Thanks for pointing this out. Fixed in commit f57d60b.
Validation:
The repository's Ruff checks still report pre-existing copyright-header and formatting issues in the touched files; no unrelated cleanup was included. |
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Thanks for picking up #1295. Two things from running the branch locally at 08cf1fb:
#1296 had the |
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Implemented in commit
Validation:
The Unit Tests and Lint workflows were created for the new head but are currently |
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Inline comments:
In `@src/any_llm/providers/gemini/utils.py`:
- Line 460: In the relevant part-processing logic, replace the dynamic getattr
calls for the types.Part fields with direct access to part.thought and
part.function_call, preserving the existing conditional behavior.
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Addressed the latest typed-access review in commit The non-streaming Gemini part conversion now uses the declared |
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Pull request overview
Preserves Gemini inline images in OpenAI-compatible completion responses.
Changes:
- Adds typed image response fields.
- Converts inline images to data URLs in streaming and non-streaming paths.
- Adds image-only response tests.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
src/any_llm/types/completion.py |
Adds image response types and fields. |
src/any_llm/providers/gemini/utils.py |
Converts and preserves inline images. |
src/any_llm/providers/gemini/base.py |
Propagates images to completion messages. |
tests/unit/providers/test_gemini_provider.py |
Tests image conversion and preservation. |
Suppressed comments (1)
src/any_llm/types/completion.py:144
- This insertion likewise separates
extra_contentfrom its streaming-field documentation, so the text now appears to describeimages. Move the image field below the existing documentation block.
images: list[ImageContent] | None = None
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| or not isinstance(blob.mime_type, str) | ||
| or not blob.mime_type.startswith("image/") |
| reasoning: Reasoning | None = None | ||
| annotations: list[dict[str, Any]] | None = None # type: ignore[assignment] | ||
| extra_content: dict[str, Any] | None = None | ||
| images: list[ImageContent] | None = None |
| message = response_dict["choices"][0]["message"] | ||
| assert message["content"] == "Described." | ||
| assert message["tool_calls"] is None | ||
| assert message["images"][0]["image_url"]["url"] == "data:image/png;base64,iVBORw==" |
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@mikemikimike please address the remaining comments from copilot if appropriate. |
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Addressed the remaining Copilot inline-media feedback in commit 1f519fa. Added non-streaming and streaming regression coverage for audio-only STOP responses; existing mixed text+audio coverage remains. Focused inline image/audio tests (4) and pre-commit checks pass. |
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JamMaster1999
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I tested this E2E for both Gemini and OpenAI endpoints.
gemini-2.5-flash-image returns a valid PNG on message.images and delta.images, and the message replays as history. The images half looks ready.
The audio half regresses OpenAI. gpt-audio-mini streaming with pcm16 works on main and fails on this head at the first chunk:
ValidationError: 2 validation errors for ChatCompletionChunk
choices.0.delta.audio.data Field required
choices.0.delta.audio.expires_at Field required
OpenAI sends delta.audio in pieces ({"id", "transcript"}, then {"data"}, then {"expires_at"}) and ChoiceDelta.audio here is the complete ChatCompletionAudio. On the Gemini side, a real gemini-2.5-flash-preview-tts call returns audio/L16;codec=pcm;rate=24000: headerless PCM whose rate lives only in the mime type, which ChatCompletionAudio cannot carry, so message.audio.data is not playable as shipped, and only the last audio part of a candidate survives. The audio tests use audio/wav with the bytes WAVE, so they never hit that path.
Suggested implementation, same pattern as ChoiceDeltaToolCall:
class ChoiceDeltaAudio(BaseModel):
"""Streaming counterpart of ``ChatCompletionAudio``; every field optional, as in ``ChoiceDeltaToolCall``."""
id: str | None = None
data: str | None = None
transcript: str | None = None
expires_at: int | None = None
class ChoiceDelta(OpenAIChoiceDelta):
...
audio: ChoiceDeltaAudio | None = NoneChatCompletionMessage keeps the base class's audio, so the redeclaration and the AudioContent alias go. In the Gemini converters, collect every audio blob into a list instead of keeping the last part. On the complete message, wrap audio/L16 in a WAV header with the rate parsed from the mime type (other formats pass through). On the stream, keep pieces raw like OpenAI's pcm16 and build ChoiceDeltaAudio(data=..., transcript=...).
Suggested tests:
test_convert_chunk_response_keeps_partial_audio_deltaintest_openai_utils.py, parametrized over the three real pieces above through_convert_completion_chunk_response. Fails on this head, passes with the type.test_convert_response_wraps_pcm_audio_as_wav, parametrized over rate 24000 and 16000, with twoaudio/L16parts: assertsRIFF, the rate at bytes 24:28, and the joined payload.test_streaming_completion_keeps_pcm_audio_raw: two parts in one chunk, joined, no header.test_convert_response_skips_empty_audio_blob.
Both commits are on JamMaster1999:pr1344-audio on top of cf55b68 to cherry-pick (a52c375 WAV and join, bfc265f delta type). Unit suite and pre-commit pass there. Live on that branch:
| Path | Result |
|---|---|
OpenAI gpt-audio-mini, stream, pcm16 |
30 chunks, 194,400 bytes of audio, transcript intact, one id. Fails on this head, passes here. |
OpenAI gpt-audio-mini, plain, wav |
Unchanged, valid RIFF on message.audio. |
Gemini gemini-2.5-flash-preview-tts, stream |
One chunk with one raw piece of 96,526 bytes on delta.audio, finish_reason stop. |
Gemini gemini-2.5-flash-preview-tts, plain |
message.audio is a WAV that file reads as 16-bit mono 24000 Hz. |
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Verified at 9d0d6a5. The audio half now has the shape from the last round: ChoiceDeltaAudio with every field optional, all audio parts collected, audio/L16 wrapped as WAV on the message with the rate parsed from the mime type, and raw pieces on the stream. The four suggested tests are in, and the rate parse gained a guard against bad values.
CI has not run on this PR (the fork workflows are still waiting for approval), so I ran the two workflows locally on this head:
uv sync --group tests --extra allthenpytest tests/unit: 2426 passed, 92 skipped.pre-commit run --all-files: every hook passes. mypy only reports missingvoyageaiandibm_watsonx_aibecause pyproject excludes both on Python 3.14; nothing in this PR touches them.
The media conversion code matches the branch I tested live in the previous review, apart from the rate guard and docstrings, so the gpt-audio-mini and gemini-2.5-flash-preview-tts results there carry over. A maintainer still needs to approve the workflow runs so Unit Tests and Lint show up on the PR.
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Live results on 9d0d6a5, all through any-llm on this head. Files checked with
The OpenRouter rows go through the OpenAI-compatible passthrough, so the new Thank you @mikemikimike for the changes. |
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@HareeshBahuleyan this needs a maintainer approval to unblock. Javier's Copilot follow-ups were addressed in 1f519fa, and I ran it live on the current head 9d0d6a5 across Gemini, OpenAI and OpenRouter (table above). It's the fix for #1295 and we're carrying it on a fork downstream in the meantime. |
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## Description
OpenAI's audio input part is `{"type": "input_audio", "input_audio":
{"data": "<base64>", "format": "wav"}}` ([API
reference](https://developers.openai.com/api/docs/api-reference/chat/create)).
The OpenAI provider passes it through untouched, so audio-capable models
already take it. The Gemini converter skipped it with a debug log, so
the one part shape that works on both providers went nowhere on Gemini.
This adds an `input_audio` branch to `_convert_messages` next to
`image_url` and `file`. It base64-decodes the data, runs the existing 20
MB inline guard, and builds `Part.from_bytes` with
`mime_type="audio/<format>"`. Gemini spells every audio format it
accepts as `audio/<name>` (wav, mp3, aiff, aac, ogg, flac, mpeg, m4a,
l16, opus, alaw, mulaw, webm, per the [audio
guide](https://ai.google.dev/gemini-api/docs/audio)), so the format name
maps straight to the MIME type with no table. The base64 decode is
factored out of `_parse_data_uri` and shared.
Verified live on this branch. A WAV of "The quick brown fox jumps over
the lazy dog" from `gpt-4o-mini-tts`, sent as `input_audio` with
"Transcribe this audio exactly":
| provider / model | reply | usage |
|---|---|---|
| gemini `gemini-2.5-flash` | `The quick brown fox jumps over the lazy
dog.` | in=122 out=32 |
| openai `gpt-audio-mini` | `The quick brown fox jumps over the lazy
dog.` | in=55 out=10 |
Tests: `test_convert_messages_with_input_audio` (MIME and bytes on the
part) and
`test_convert_messages_input_audio_without_format_raises_invalid_request`.
The oversized case shares the existing guard test.
`tests/unit/providers/test_gemini_provider.py`, 266 passed. Pre-commit
clean.
## PR Type
- 🆕 New Feature
## Relevant issues
None open. Audio output landed in #1344; this is the input side.
## Checklist
- [x] I understand the code I am submitting.
- [x] I have added unit tests that prove my fix/feature works
- [x] I have run this code locally and verified it fixes the issue.
- [x] New and existing tests pass locally
- [x] Documentation was updated where necessary (not applicable)
- [x] I have read and followed the [contribution
guidelines](https://github.com/mozilla-ai/any-llm/blob/main/CONTRIBUTING.md)
- [x] **AI Usage:**
- [ ] No AI was used.
- [x] AI was used for drafting/refactoring.
- [ ] This is fully AI-generated.
## AI Usage Information
- AI Model used: Claude (Fable 5.1)
- AI Developer Tool used: Claude Code
- Any other info you'd like to share:
- [ ] I am an AI Agent filling out this form (check box if true)
https://claude.ai/code/session_01546kUvB5GcyCkhQVSjpjbk
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added support for converting OpenAI audio input into Gemini-compatible
audio content.
- Supports audio formats such as WAV and assigns the appropriate MIME
type.
- **Bug Fixes**
- Enforced the 20 MB limit for encoded image and file data before
decoding.
- Improved validation and error handling for malformed or non-ASCII
base64 audio data.
- Invalid audio input now produces clear request validation errors.
- Images exactly at the 20 MB inline upload limit are now accepted.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Hareesh <hareeshbahuleyan@gmail.com>
Description
Gemini media responses currently discard
inline_dataparts during conversion to the OpenAI-compatible response shape. This makes image-only responses appear to have no choices and loses media from text-plus-image responses.This change converts inline media to data URLs in both non-streaming and streaming response paths, exposes them as
images, and emits a choice when a candidate contains media without text or tool calls.PR Type
Relevant issues
Fixes #1295
Testing
python -m pytest tests/unit/providers/test_gemini_provider.py -q -k 'skips_parts or image_only'ruff check src/any_llm/providers/gemini/utils.py tests/unit/providers/test_gemini_provider.pygit diff --checkThe focused tests pass locally. The full provider module includes existing integration-style cases that exceeded the local command timeout.
Checklist
AI Usage Information
AI Model used: GPT-5
AI Developer Tool used: Codex
Any other info you'd like to share: The patch and tests were reviewed locally before submission.
I am an AI Agent filling out this form (check box if true)
Summary by CodeRabbit
New Features
data:URLs.Bug Fixes