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"""Tests for audio helpers: speed parameters, chunk cleanup, encoding,
command construction, and duration verification."""
import tempfile
import unittest
from pathlib import Path
from converter import audio
from converter import config
from converter.audio import (
_collect_chunk_files,
_encode_args,
build_concat_command,
build_ffmetadata,
build_m4b_chapters_command,
cleanup_chunks,
speed_export_params,
verify_output_duration,
)
class SpeedExportParamsTests(unittest.TestCase):
def test_normal_speed_no_filter(self):
self.assertEqual(speed_export_params(1.0), [])
def test_simple_speedup(self):
self.assertEqual(speed_export_params(1.5), ["-filter:a", "atempo=1.5"])
def test_simple_slowdown(self):
self.assertEqual(speed_export_params(0.75), ["-filter:a", "atempo=0.75"])
def test_chained_speedup_beyond_2x(self):
self.assertEqual(speed_export_params(3.0), ["-filter:a", "atempo=2.0,atempo=1.5"])
def test_chained_slowdown_below_half(self):
self.assertEqual(speed_export_params(0.25), ["-filter:a", "atempo=0.5,atempo=0.5"])
def test_zero_speed_rejected(self):
with self.assertRaises(ValueError):
speed_export_params(0)
def test_negative_speed_rejected(self):
with self.assertRaises(ValueError):
speed_export_params(-1.5)
class CleanupChunksTests(unittest.TestCase):
def test_removes_only_chunk_files(self):
with tempfile.TemporaryDirectory() as tmp:
chunks_dir = Path(tmp)
(chunks_dir / "chunk_0001.wav").write_bytes(b"stale")
(chunks_dir / "chunk_0002.wav").write_bytes(b"stale")
(chunks_dir / "keep.txt").write_bytes(b"keep")
original = config.CHUNKS_FOLDER
config.CHUNKS_FOLDER = chunks_dir
try:
cleanup_chunks()
finally:
config.CHUNKS_FOLDER = original
self.assertFalse((chunks_dir / "chunk_0001.wav").exists())
self.assertFalse((chunks_dir / "chunk_0002.wav").exists())
self.assertTrue((chunks_dir / "keep.txt").exists())
def test_removes_chapter_files(self):
with tempfile.TemporaryDirectory() as tmp:
chunks_dir = Path(tmp)
(chunks_dir / "chapter_0001.m4b").write_bytes(b"stale")
(chunks_dir / "chunk_0001.wav").write_bytes(b"stale")
original = config.CHUNKS_FOLDER
config.CHUNKS_FOLDER = chunks_dir
try:
cleanup_chunks()
finally:
config.CHUNKS_FOLDER = original
self.assertFalse((chunks_dir / "chapter_0001.m4b").exists())
self.assertFalse((chunks_dir / "chunk_0001.wav").exists())
class EncodeArgsTests(unittest.TestCase):
def test_mp3_uses_bitrate_only(self):
self.assertEqual(_encode_args("mp3"), ["-b:a", config.AUDIO_BITRATE])
def test_m4b_uses_aac(self):
self.assertEqual(_encode_args("m4b"), ["-c:a", "aac", "-b:a", config.AUDIO_BITRATE])
def test_wav_is_lossless_pcm(self):
self.assertEqual(_encode_args("wav"), ["-c:a", "pcm_s16le"])
def test_ogg_uses_libvorbis(self):
self.assertEqual(_encode_args("ogg"), ["-c:a", "libvorbis", "-b:a", config.AUDIO_BITRATE])
def test_flac_is_lossless(self):
self.assertEqual(_encode_args("flac"), ["-c:a", "flac"])
class M4bContainerArgsTests(unittest.TestCase):
def setUp(self):
self._original = audio._brand_supported
audio._brand_supported = True
def tearDown(self):
audio._brand_supported = self._original
def test_includes_faststart_and_brand(self):
args = audio._m4b_container_args()
self.assertIn("+faststart", args)
self.assertIn("M4B ", args)
def test_brand_omitted_when_unsupported(self):
audio._brand_supported = False
self.assertEqual(audio._m4b_container_args(), ["-movflags", "+faststart"])
class BuildConcatCommandTests(unittest.TestCase):
def setUp(self):
self._original = audio._brand_supported
audio._brand_supported = True
def tearDown(self):
audio._brand_supported = self._original
def test_mp3_has_no_container_flags(self):
cmd = build_concat_command(Path("list.txt"), Path("out.mp3"), "mp3")
self.assertEqual(cmd[:6], ["ffmpeg", "-y", "-f", "concat", "-safe", "0"])
self.assertNotIn("-movflags", cmd)
self.assertEqual(cmd[-1], "out.mp3")
def test_m4b_gets_faststart_and_brand(self):
cmd = build_concat_command(Path("list.txt"), Path("out.m4b"), "m4b")
self.assertIn("+faststart", cmd)
self.assertIn("M4B ", cmd)
self.assertEqual(cmd[-1], "out.m4b")
def test_speed_copy_writes_two_outputs(self):
cmd = build_concat_command(Path("list.txt"), Path("out.m4b"), "m4b",
speed=1.5, speed_path=Path("out_1.5.m4b"))
self.assertIn("out.m4b", cmd)
self.assertIn("out_1.5.m4b", cmd)
# faststart must apply to both outputs
self.assertEqual(cmd.count("+faststart"), 2)
self.assertTrue(any("atempo=1.5" in arg for arg in cmd))
def test_wav_intermediate(self):
cmd = build_concat_command(Path("list.txt"), Path("chapter.wav"), "wav")
self.assertIn("pcm_s16le", cmd)
self.assertNotIn("-movflags", cmd)
def test_speed_without_speed_path_rejected(self):
with self.assertRaises(ValueError):
build_concat_command(Path("list.txt"), Path("out.mp3"), "mp3", speed=1.5)
class CollectChunkFilesTests(unittest.TestCase):
def test_uses_recorded_paths_exactly(self):
with tempfile.TemporaryDirectory() as tmp:
present = Path(tmp) / "chunk_0001.wav"
present.write_bytes(b"audio")
chunk_results = {
1: present,
2: None, # failed chunk
3: Path(tmp) / "chunk_0003.wav", # recorded but deleted
}
files, missing = _collect_chunk_files(3, chunk_results)
self.assertEqual(files, [present])
self.assertEqual(missing, [2, 3])
def test_glob_fallback_without_results(self):
with tempfile.TemporaryDirectory() as tmp:
chunks_dir = Path(tmp)
(chunks_dir / "chunk_0002.wav").write_bytes(b"audio")
(chunks_dir / "chunk_0001.wav").write_bytes(b"audio")
original = config.CHUNKS_FOLDER
config.CHUNKS_FOLDER = chunks_dir
try:
files, missing = _collect_chunk_files(3)
finally:
config.CHUNKS_FOLDER = original
self.assertEqual(files, [chunks_dir / "chunk_0001.wav",
chunks_dir / "chunk_0002.wav"])
self.assertEqual(missing, [3])
class BuildM4bChaptersCommandTests(unittest.TestCase):
def setUp(self):
self._original = audio._brand_supported
audio._brand_supported = True
def tearDown(self):
audio._brand_supported = self._original
def test_base_output_maps_metadata_and_chapters(self):
cmd = build_m4b_chapters_command(Path("list.txt"), Path("meta.txt"), Path("out.m4b"))
self.assertIn("-map_metadata", cmd)
self.assertIn("-map_chapters", cmd)
self.assertIn("out.m4b", cmd)
self.assertIn("+faststart", cmd)
self.assertNotIn("filter_complex", cmd)
def test_speed_outputs_get_their_own_chapter_metadata(self):
cmd = build_m4b_chapters_command(
Path("list.txt"), Path("meta.txt"), Path("out.m4b"),
speed=2.0, speed_path=Path("out_2.m4b"), speed_metadata_file=Path("meta2.txt"),
)
self.assertEqual(cmd.count("+faststart"), 2)
self.assertEqual(cmd.count("-map_chapters"), 2)
self.assertTrue(any("atempo=2" in arg for arg in cmd))
# base output chapters come from metadata input 1, speed copy from 2
chapter_flags = [i for i, v in enumerate(cmd) if v == "-map_chapters"]
self.assertEqual(cmd[chapter_flags[0] + 1], "1")
self.assertEqual(cmd[chapter_flags[1] + 1], "2")
base_idx, speed_idx = cmd.index("out.m4b"), cmd.index("out_2.m4b")
self.assertLess(chapter_flags[0], base_idx)
self.assertGreater(chapter_flags[1], base_idx)
self.assertLess(chapter_flags[1], speed_idx)
class VerifyOutputDurationTests(unittest.TestCase):
def _patch_probe(self, ms):
audio.probe_duration_ms = lambda path: ms
def setUp(self):
self._original_probe = audio.probe_duration_ms
def tearDown(self):
audio.probe_duration_ms = self._original_probe
def test_close_duration_passes(self):
self._patch_probe(100_000)
self.assertTrue(verify_output_duration(Path("x.m4b"), 101_000))
def test_unverifiable_duration_passes(self):
self._patch_probe(0)
self.assertTrue(verify_output_duration(Path("x.m4b"), 100_000))
def test_zero_expected_passes(self):
self._patch_probe(50_000)
self.assertTrue(verify_output_duration(Path("x.m4b"), 0))
def test_large_drift_fails(self):
self._patch_probe(3_600_000) # bogus "1 hour" for a 1 minute book
with self.assertLogs(level="ERROR"):
self.assertFalse(verify_output_duration(Path("x.m4b"), 60_000))
class BuildFFMetadataTests(unittest.TestCase):
def test_writes_chapters(self):
chapters = [(0, 1200, "One"), (1200, 2500, "Two")]
with tempfile.TemporaryDirectory() as tmp:
path = Path(tmp) / "meta.txt"
build_ffmetadata(chapters, path)
content = path.read_text(encoding="utf-8")
self.assertTrue(content.startswith(";FFMETADATA1\n"))
self.assertIn("[CHAPTER]", content)
self.assertIn("TIMEBASE=1/1000", content)
self.assertIn("START=0", content)
self.assertIn("END=1200", content)
self.assertIn("title=One", content)
self.assertIn("START=1200", content)
self.assertIn("title=Two", content)
def test_escapes_special_characters(self):
# ffmpeg's FFMETADATA format treats = ; # and \ as structural.
chapters = [(0, 1000, "A = B; C# D\\E")]
with tempfile.TemporaryDirectory() as tmp:
path = Path(tmp) / "meta.txt"
build_ffmetadata(chapters, path)
content = path.read_text(encoding="utf-8")
self.assertIn(r"title=A \= B\; C\# D\\E", content)
def test_collapses_newlines_in_titles(self):
chapters = [(0, 1000, "Two\nLines")]
with tempfile.TemporaryDirectory() as tmp:
path = Path(tmp) / "meta.txt"
build_ffmetadata(chapters, path)
content = path.read_text(encoding="utf-8")
self.assertIn("title=Two Lines\n", content)
self.assertNotIn("title=Two\n", content)
if __name__ == "__main__":
unittest.main()
|
