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"""Tests for AudioService"""
from unittest.mock import patch
import numpy as np
import pytest
from api.src.inference.base import AudioChunk
from api.src.services.audio import AudioNormalizer, AudioService
from api.src.services.streaming_audio_writer import StreamingAudioWriter
@pytest.fixture(autouse=True)
def mock_settings():
"""Mock settings for all tests"""
with patch("api.src.services.audio.settings") as mock_settings:
mock_settings.gap_trim_ms = 250
yield mock_settings
@pytest.fixture
def sample_audio():
"""Generate a simple sine wave for testing"""
sample_rate = 24000
duration = 0.1 # 100ms
t = np.linspace(0, duration, int(sample_rate * duration))
frequency = 440 # A4 note
return np.sin(2 * np.pi * frequency * t).astype(np.float32), sample_rate
@pytest.mark.asyncio
async def test_convert_to_wav(sample_audio):
"""Test converting to WAV format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("wav", sample_rate=24000)
# Write and finalize in one step for WAV
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "wav", writer, is_last_chunk=False
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# Check WAV header
assert audio_chunk.output.startswith(b"RIFF")
assert b"WAVE" in audio_chunk.output[:12]
@pytest.mark.asyncio
async def test_convert_to_mp3(sample_audio):
"""Test converting to MP3 format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("mp3", sample_rate=24000)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "mp3", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# Check MP3 header (ID3 or MPEG frame sync)
assert audio_chunk.output.startswith(b"ID3") or audio_chunk.output.startswith(
b"\xff\xfb"
)
@pytest.mark.asyncio
async def test_convert_to_opus(sample_audio):
"""Test converting to Opus format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("opus", sample_rate=24000)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "opus", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# Check OGG header
assert audio_chunk.output.startswith(b"OggS")
@pytest.mark.asyncio
async def test_convert_to_flac(sample_audio):
"""Test converting to FLAC format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("flac", sample_rate=24000)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "flac", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# Check FLAC header
assert audio_chunk.output.startswith(b"fLaC")
@pytest.mark.asyncio
async def test_convert_to_aac(sample_audio):
"""Test converting to M4A format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("aac", sample_rate=24000)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "aac", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# Check ADTS header (AAC)
assert audio_chunk.output.startswith(b"\xff\xf0") or audio_chunk.output.startswith(
b"\xff\xf1"
)
@pytest.mark.asyncio
async def test_convert_to_pcm(sample_audio):
"""Test converting to PCM format"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("pcm", sample_rate=24000)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "pcm", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
# PCM is raw bytes, so no header to check
@pytest.mark.asyncio
async def test_convert_to_invalid_format_raises_error(sample_audio):
"""Test that converting to an invalid format raises an error"""
# audio_data, sample_rate = sample_audio
with pytest.raises(ValueError, match="Unsupported format: invalid"):
writer = StreamingAudioWriter("invalid", sample_rate=24000)
@pytest.mark.asyncio
async def test_normalization_wav(sample_audio):
"""Test that WAV output is properly normalized to int16 range"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("wav", sample_rate=24000)
# Create audio data outside int16 range
large_audio = audio_data * 1e5
# Write and finalize in one step for WAV
audio_chunk = await AudioService.convert_audio(
AudioChunk(large_audio), "wav", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
@pytest.mark.asyncio
async def test_normalization_pcm(sample_audio):
"""Test that PCM output is properly normalized to int16 range"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("pcm", sample_rate=24000)
# Create audio data outside int16 range
large_audio = audio_data * 1e5
audio_chunk = await AudioService.convert_audio(
AudioChunk(large_audio), "pcm", writer
)
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
@pytest.mark.asyncio
async def test_invalid_audio_data():
"""Test handling of invalid audio data"""
invalid_audio = np.array([]) # Empty array
sample_rate = 24000
writer = StreamingAudioWriter("wav", sample_rate=24000)
with pytest.raises(ValueError):
await AudioService.convert_audio(invalid_audio, sample_rate, "wav", writer)
@pytest.mark.asyncio
async def test_different_sample_rates(sample_audio):
"""Test converting audio with different sample rates"""
audio_data, _ = sample_audio
sample_rates = [8000, 16000, 44100, 48000]
for rate in sample_rates:
writer = StreamingAudioWriter("wav", sample_rate=rate)
audio_chunk = await AudioService.convert_audio(
AudioChunk(audio_data), "wav", writer
)
writer.close()
assert isinstance(audio_chunk.output, bytes)
assert isinstance(audio_chunk, AudioChunk)
assert len(audio_chunk.output) > 0
@pytest.mark.asyncio
async def test_buffer_position_after_conversion(sample_audio):
"""Test that buffer position is reset after writing"""
audio_data, sample_rate = sample_audio
writer = StreamingAudioWriter("wav", sample_rate=24000)
# Write and finalize in one step for first conversion
audio_chunk1 = await AudioService.convert_audio(
AudioChunk(audio_data), "wav", writer, is_last_chunk=True
)
assert isinstance(audio_chunk1.output, bytes)
assert isinstance(audio_chunk1, AudioChunk)
# Convert again to ensure buffer was properly reset
writer = StreamingAudioWriter("wav", sample_rate=24000)
audio_chunk2 = await AudioService.convert_audio(
AudioChunk(audio_data), "wav", writer, is_last_chunk=True
)
assert isinstance(audio_chunk2.output, bytes)
assert isinstance(audio_chunk2, AudioChunk)
assert len(audio_chunk1.output) == len(audio_chunk2.output)
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