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--git a/pyproject.toml b/pyproject.toml index 496d76a..a2e7476 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -20,6 +20,7 @@ websockets = "^10.3" tqdm = "*" torchaudio = "^0.12.1" PySoundFile = {version = "^0.9.0.post1", platform = "windows"} +scipy = "^1.9.3" [tool.poetry.group.dev.dependencies] diff --git a/whispering/resample.py b/whispering/resample.py new file mode 100644 index 0000000..5eaa607 --- /dev/null +++ b/whispering/resample.py @@ -0,0 +1,24 @@ +#!/usr/bin/env python3 +import numpy as np +from scipy.interpolate import interp1d +from whisper.audio import SAMPLE_RATE + + +def resample(x: np.ndarray, source_sr: int) -> np.ndarray: + """Resample a numpy array to match the SAMPLE_RATE + of Whisper (16 000 Hz). + + Args: + x (np.ndarray): Source numpy array + source_sr (int): Source sample rate + + Returns: + np.ndarray: The resampled array + """ + + if source_sr == SAMPLE_RATE: + return x + factor = source_sr / SAMPLE_RATE + n = int(np.ceil(x.size / factor)) + f = interp1d(np.linspace(0, 1, x.size), x, "linear") + return f(np.linspace(0, 1, n)) \ No newline at end of file diff --git a/whispering/schema.py b/whispering/schema.py index 561f400..ff70ec4 100644 --- a/whispering/schema.py +++ b/whispering/schema.py @@ -49,6 +49,7 @@ class Context(BaseModel, arbitrary_types_allowed=True): max_nospeech_skip: int data_type: str = "float32" + source_sample_rate: int = 16000 class ParsedChunk(BaseModel): diff --git a/whispering/serve.py b/whispering/serve.py index 4ee4f77..b128059 100644 --- a/whispering/serve.py +++ b/whispering/serve.py @@ -11,6 +11,7 @@ from whispering.schema import CURRENT_PROTOCOL_VERSION, Context from whispering.transcriber import WhisperStreamingTranscriber +from whispering.resample import resample logger = getLogger(__name__) @@ -77,6 +78,7 @@ async def serve_with_websocket_main(websocket): ) return audio = np.frombuffer(message, dtype=np.dtype(ctx.data_type)).astype(np.float32) + audio = resample(audio, ctx.source_sample_rate) for chunk in g_wsp.transcribe( audio=audio, # type: ignore ctx=ctx,