Add lossless output subtype selection - #308
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. WalkthroughThe change adds configurable WAV and FLAC output subtypes. The CLI and ChangesOutput subtype support
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds configurable lossless output subtypes while retaining the existing default behavior. No concrete merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant CLI
participant Separator
participant CommonSeparator
participant soundfile
CLI->>Separator: pass output_subtype
Separator->>CommonSeparator: pass normalized subtype
CommonSeparator->>CommonSeparator: resolve subtype for format and input metadata
CommonSeparator->>soundfile: write non-PCM_16 WAV or FLAC output
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@audio_separator/separator/audio_io.py`:
- Around line 43-44: Update resolve_output_subtype so AUTO-resolved subtypes are
validated with sf.check_format() for the target container; when VORBIS is
incompatible with WAV or FLAC, fall back to a compatible PCM subtype derived
from the input bit depth. Preserve valid subtype selections and add coverage for
input_subtype="VORBIS".
In `@audio_separator/separator/common_separator.py`:
- Line 368: Update the pydub export depth logic in the lossless WAV/FLAC
handling to derive the bit depth from the resolved output_subtype rather than
self.input_bit_depth, ensuring explicit PCM_16 remains 16-bit even for 24-bit
input metadata. Add a regression test covering explicit PCM_16 output with
24-bit input metadata.
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README.mdaudio_separator/separator/audio_io.pyaudio_separator/separator/common_separator.pyaudio_separator/separator/separator.pyaudio_separator/utils/cli.pytests/unit/test_audio_output_contract.pytests/unit/test_bit_depth_writing.pytests/unit/test_cli.pytests/unit/test_separator_api_compatibility.py
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Closes #258.
Adds an explicit
output_subtypeoption for lossless WAV/FLAC output while keepingAUTOas the backward-compatible default. Higher-depth pydub exports now write model float samples directly through soundfile, avoiding the existing int16 precision loss.Validation:
560 passed, 4 skipped; focused output/API/CLI tests:71 passed, 1 skipped.Summary by CodeRabbit
New Features
AUTO,PCM_16,PCM_24,PCM_32, andFLOAT.--output_subtypeCLI option and matching API setting.AUTOpreserves compatible input subtypes or selects an appropriate subtype based on bit depth.Bug Fixes
Documentation