From 261b6046838f829c27607c1cec3fc85016233f0c Mon Sep 17 00:00:00 2001
From: Josef Haupt <josef.haupt@informatik.tu-chemnitz.de>
Date: Tue, 1 Sep 2026 14:40:37 +0200
Subject: [PATCH] Replace reampy with soxr

---
 birdnet_analyzer/audio.py |  4 ++--
 tests/test_audio.py       | 41 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)
 create mode 100644 tests/test_audio.py

diff --git a/birdnet_analyzer/audio.py b/birdnet_analyzer/audio.py
index ea2e338d9..b5eb1cf88 100644
--- a/birdnet_analyzer/audio.py
+++ b/birdnet_analyzer/audio.py
@@ -48,7 +48,7 @@ def open_audio_file(
             offset=offset,
             duration=duration,
             mono=True,
-            res_type="kaiser_fast",
+            res_type="soxr_hq",
         )
 
     else:
@@ -61,7 +61,7 @@ def open_audio_file(
             sig,
             orig_sr=int(rate * speed),
             target_sr=sample_rate,
-            res_type="kaiser_fast",
+            res_type="soxr_hq",
         )
         rate = sample_rate
 
diff --git a/tests/test_audio.py b/tests/test_audio.py
new file mode 100644
index 000000000..0d325a786
--- /dev/null
+++ b/tests/test_audio.py
@@ -0,0 +1,41 @@
+import numpy as np
+import pytest
+import soundfile as sf
+
+from birdnet_analyzer import audio
+
+
+def _write_sine_wav(path, sample_rate, duration=1.0, freq=440.0):
+    t = np.linspace(0, duration, int(sample_rate * duration), endpoint=False)
+    sf.write(path, np.sin(2 * np.pi * freq * t).astype(np.float32), sample_rate)
+
+
+def test_open_audio_file_resamples_non_native_rate(tmp_path):
+    path = str(tmp_path / "44k.wav")
+    _write_sine_wav(path, 44100)
+
+    sig, rate = audio.open_audio_file(path)
+
+    assert rate == 48000
+    assert len(sig) == pytest.approx(48000, abs=2)
+
+
+@pytest.mark.parametrize("speed", [0.5, 2.0])
+def test_open_audio_file_speed_scales_duration(tmp_path, speed):
+    path = str(tmp_path / "48k.wav")
+    _write_sine_wav(path, 48000)
+
+    sig, rate = audio.open_audio_file(path, speed=speed)
+
+    assert rate == 48000
+    assert len(sig) == pytest.approx(48000 / speed, abs=2)
+
+
+def test_open_audio_file_speed_with_non_native_rate(tmp_path):
+    path = str(tmp_path / "44k.wav")
+    _write_sine_wav(path, 44100)
+
+    sig, rate = audio.open_audio_file(path, speed=2.0)
+
+    assert rate == 48000
+    assert len(sig) == pytest.approx(24000, abs=2)