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torlando-tech
6e47cb808b
PCM_RING_FRAMES 16→50 (320ms→1000ms capacity) and PREBUFFER_FRAMES 3→15 (60ms→300ms prebuffer) to match LXST-kt's buffering strategy. Interop test suite confirms zero underruns with ±100ms jitter at these settings. Also adds tests/interop/ with 48 Python tests verifying wire format, codec round-trip, and pipeline compatibility between Pyxis, Python LXST, and LXST-kt implementations. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
303 lines
12 KiB
Python
303 lines
12 KiB
Python
"""
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Codec round-trip interop tests.
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Verifies that audio encoded by one implementation can be decoded by another.
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NOTE: Codec2 is a parametric speech codec — it models speech characteristics
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(pitch, formants) rather than the waveform. SNR metrics are meaningless for
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Codec2 since the reconstructed waveform intentionally differs from the input.
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Instead, we verify:
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- Encoded bytes are deterministic and consistent across implementations
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- Both decoders can decode each other's output without errors
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- Decoded output has non-trivial amplitude (not silence)
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- Cross-decode produces the same samples as self-decode
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"""
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import math
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import struct
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import numpy as np
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import pycodec2
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import pytest
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from conftest import (
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CODEC_CODEC2, MODE_HEADERS, HEADER_MODES,
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encode_codec2_subframes, batch_subframes_pyxis_style,
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build_pyxis_audio_packet, build_columba_audio_packet,
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parse_pyxis_rx, parse_lxst_python_rx,
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)
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def generate_test_audio(duration_s=1.0, sr=8000):
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"""Generate deterministic test audio (int16 at 8kHz)."""
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t = np.arange(int(sr * duration_s)) / sr
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signal = np.sin(2 * np.pi * 440 * t) * 16000
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return signal.astype(np.int16)
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class TestCodec2ByteEquivalence:
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"""
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Test that encoding sub-frames individually (Pyxis style) produces
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the same bytes as encoding them as part of a larger buffer (LXST-kt style).
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"""
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def test_individual_vs_batch_encode_same_instance(self):
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"""
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Same codec2 instance: encoding 160 samples x 10 individually should
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produce the same bytes as encoding them sequentially.
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"""
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pcm = generate_test_audio(0.2)[:1600] # 10 sub-frames
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codec = pycodec2.Codec2(3200)
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spf = codec.samples_per_frame()
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individual = b""
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for i in range(10):
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individual += codec.encode(pcm[i * spf:(i + 1) * spf])
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codec2 = pycodec2.Codec2(3200)
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batch = b""
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for i in range(10):
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batch += codec2.encode(pcm[i * spf:(i + 1) * spf])
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assert individual == batch
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def test_separate_instances_produce_same_bytes(self):
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"""
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Two separate codec2 instances encoding the same audio should
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produce identical bytes.
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"""
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pcm = generate_test_audio(0.2)[:1600]
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spf = 160
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codec_a = pycodec2.Codec2(3200)
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codec_b = pycodec2.Codec2(3200)
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encoded_a = b""
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encoded_b = b""
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for i in range(10):
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chunk = pcm[i * spf:(i + 1) * spf]
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encoded_a += codec_a.encode(chunk)
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encoded_b += codec_b.encode(chunk)
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assert encoded_a == encoded_b
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def test_encode_decode_produces_non_silence(self):
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"""
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Codec2 encode→decode should produce non-zero output.
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(Codec2 is parametric — we can't check waveform similarity,
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but we can verify it's not outputting silence.)
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"""
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pcm = generate_test_audio(1.0)[:8000]
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codec_enc = pycodec2.Codec2(3200)
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codec_dec = pycodec2.Codec2(3200)
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spf = 160
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n_frames = len(pcm) // spf
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decoded = np.zeros(n_frames * spf, dtype=np.int16)
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for i in range(n_frames):
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raw = codec_enc.encode(pcm[i * spf:(i + 1) * spf])
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decoded[i * spf:(i + 1) * spf] = codec_dec.decode(raw)
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max_amp = np.max(np.abs(decoded))
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print(f"Codec2 3200 decode max amplitude: {max_amp}")
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assert max_amp > 100, f"Decoded audio is near-silence: max_amp={max_amp}"
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def test_frame_size_consistency(self):
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"""Verify encoded frame sizes match expectations for each mode."""
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modes = {3200: (160, 8), 2400: (160, 6), 1600: (320, 8)}
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for bitrate, (expected_spf, expected_bpf) in modes.items():
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c = pycodec2.Codec2(bitrate)
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assert c.samples_per_frame() == expected_spf, \
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f"Mode {bitrate}: SPF={c.samples_per_frame()}, expected {expected_spf}"
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assert c.bytes_per_frame() == expected_bpf, \
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f"Mode {bitrate}: BPF={c.bytes_per_frame()}, expected {expected_bpf}"
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class TestCrossImplementationDecode:
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"""
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Test that encoded data from one side can be decoded by the other.
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"""
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def test_pyxis_encoded_decoded_by_lxst_python(self, lxst_codec2_3200):
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"""
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Pyxis encodes 10 sub-frames → batch → wire.
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Python LXST parses and decodes.
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Verifies non-silence output.
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"""
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pcm = generate_test_audio(0.2)[:1600]
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encoder = pycodec2.Codec2(3200)
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subframes = encode_codec2_subframes(encoder, pcm, mode_header=MODE_HEADERS[3200])
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batch = batch_subframes_pyxis_style(subframes, MODE_HEADERS[3200])
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wire = build_pyxis_audio_packet(batch)
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result = parse_lxst_python_rx(wire)
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codec_type, codec_data = result["frames"][0]
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decoded = lxst_codec2_3200.decode(codec_data)
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assert decoded.shape[0] == 1600
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assert decoded.shape[1] == 1
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max_amp = np.max(np.abs(decoded))
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print(f"Pyxis→LXST decode max amplitude: {max_amp:.4f}")
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assert max_amp > 0.001, f"Decoded audio is near-silence"
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def test_lxst_python_encoded_decoded_by_pyxis(self, lxst_codec2_3200):
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"""
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Columba encodes 200ms → wire.
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Pyxis parses and decodes with pycodec2.
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Uses pycodec2 directly for encoding (same underlying libcodec2 as LXST)
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to avoid Python LXST's array shape requirements.
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"""
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pcm = generate_test_audio(0.2)[:1600]
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# Encode like Columba: [mode_header] + [N * raw_codec2]
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encoder = pycodec2.Codec2(3200)
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spf = encoder.samples_per_frame()
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bpf = encoder.bytes_per_frame()
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n_frames = len(pcm) // spf
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encoded = bytes([MODE_HEADERS[3200]])
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for i in range(n_frames):
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encoded += encoder.encode(pcm[i * spf:(i + 1) * spf])
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wire = build_columba_audio_packet(CODEC_CODEC2, encoded)
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result = parse_pyxis_rx(wire)
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codec_type, codec_data = result["frames"][0]
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# Decode like Pyxis codec_wrapper.cpp
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header = codec_data[0]
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raw_data = codec_data[1:]
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decoder = pycodec2.Codec2(3200)
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spf = decoder.samples_per_frame()
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bpf = decoder.bytes_per_frame()
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n_frames = len(raw_data) // bpf
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decoded_pcm = np.zeros(n_frames * spf, dtype=np.int16)
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for i in range(n_frames):
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decoded_pcm[i * spf:(i + 1) * spf] = decoder.decode(
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raw_data[i * bpf:(i + 1) * bpf])
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assert len(decoded_pcm) == 1600
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max_amp = np.max(np.abs(decoded_pcm))
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print(f"LXST→Pyxis decode max amplitude: {max_amp}")
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assert max_amp > 100, f"Decoded audio is near-silence"
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def test_cross_decode_consistency(self):
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"""
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Both decoders (pycodec2 and Python LXST) should produce identical
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output when given the same encoded bytes.
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This is the critical interop test — if the decoded samples match,
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the audio quality will be identical on both devices.
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"""
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from LXST.Codecs.Codec2 import Codec2 as LXSTCodec2
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pcm = generate_test_audio(0.2)[:1600]
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encoder = pycodec2.Codec2(3200)
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spf = encoder.samples_per_frame()
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bpf = encoder.bytes_per_frame()
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# Encode with pycodec2 (raw bytes, no mode header)
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raw_encoded = b""
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for i in range(10):
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raw_encoded += encoder.encode(pcm[i * spf:(i + 1) * spf])
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# Full encoded with mode header (as sent over wire)
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full_encoded = bytes([MODE_HEADERS[3200]]) + raw_encoded
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# Decode with pycodec2
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pyxis_decoder = pycodec2.Codec2(3200)
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pyxis_decoded = np.zeros(1600, dtype=np.int16)
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for i in range(10):
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pyxis_decoded[i * spf:(i + 1) * spf] = pyxis_decoder.decode(
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raw_encoded[i * bpf:(i + 1) * bpf])
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# Decode with Python LXST
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lxst_decoder = LXSTCodec2(mode=3200)
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lxst_decoded = lxst_decoder.decode(full_encoded)
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lxst_decoded_int16 = (lxst_decoded[:, 0] * 32767).astype(np.int16)
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# Both decoders should produce very close output.
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# Python LXST decodes to float32 then we convert back to int16:
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# int16 → float32(/32768) → decode → float32 → int16(*32767)
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# The asymmetric 32768/32767 plus float32 precision causes ±~40 sample diff.
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# This is fine — it's a normalization artifact, not a codec mismatch.
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diff = np.abs(pyxis_decoded.astype(np.int32) - lxst_decoded_int16.astype(np.int32))
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max_diff = np.max(diff)
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mean_diff = np.mean(diff)
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print(f"Cross-decode diff: max={max_diff}, mean={mean_diff:.2f}")
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assert max_diff <= 50, f"Decoded samples differ too much: max_diff={max_diff}"
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class TestBatchSizes:
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"""Test various batch sizes that Pyxis might send."""
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@pytest.mark.parametrize("n_subframes", [1, 5, 10, 15, 20, 25, 30])
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def test_variable_batch_decode(self, n_subframes):
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"""Python LXST should decode any batch size from 1 to 30 sub-frames."""
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from LXST.Codecs.Codec2 import Codec2 as LXSTCodec2
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pcm = generate_test_audio(1.0)[:n_subframes * 160]
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encoder = pycodec2.Codec2(3200)
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subframes = encode_codec2_subframes(encoder, pcm, mode_header=MODE_HEADERS[3200])
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assert len(subframes) == n_subframes
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batch = batch_subframes_pyxis_style(subframes, MODE_HEADERS[3200])
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wire = build_pyxis_audio_packet(batch)
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result = parse_lxst_python_rx(wire)
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codec_type, codec_data = result["frames"][0]
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decoder = LXSTCodec2(mode=3200)
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decoded = decoder.decode(codec_data)
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assert decoded.shape[0] == n_subframes * 160
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assert np.max(np.abs(decoded)) > 0.001
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@pytest.mark.parametrize("n_subframes", [1, 5, 10, 15, 20, 25, 30])
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def test_variable_batch_pyxis_decode(self, n_subframes):
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"""Pyxis parser should handle any batch size."""
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pcm = generate_test_audio(1.0)[:n_subframes * 160]
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encoder = pycodec2.Codec2(3200)
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subframes = encode_codec2_subframes(encoder, pcm, mode_header=MODE_HEADERS[3200])
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batch = batch_subframes_pyxis_style(subframes, MODE_HEADERS[3200])
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wire = build_pyxis_audio_packet(batch)
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result = parse_pyxis_rx(wire)
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assert len(result["frames"]) == 1
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codec_type, codec_data = result["frames"][0]
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assert len(codec_data) == 1 + n_subframes * 8
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class TestCodec2ModeNegotiation:
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"""Test that mode header switching works across implementations."""
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def test_mode_switch_mid_stream(self):
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"""
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Both Pyxis and LXST-kt support dynamic codec mode switching via
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the mode header byte. Test switching from 3200 to 1600 mid-stream.
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"""
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from LXST.Codecs.Codec2 import Codec2 as LXSTCodec2
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pcm = generate_test_audio(1.0)[:8000]
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# First batch: 3200 bps (10 sub-frames of 160 samples)
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enc_3200 = pycodec2.Codec2(3200)
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subframes_3200 = encode_codec2_subframes(enc_3200, pcm[:1600], mode_header=MODE_HEADERS[3200])
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batch_3200 = batch_subframes_pyxis_style(subframes_3200, MODE_HEADERS[3200])
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wire_3200 = build_pyxis_audio_packet(batch_3200)
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# Second batch: 1600 bps (5 sub-frames of 320 samples)
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enc_1600 = pycodec2.Codec2(1600)
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subframes_1600 = encode_codec2_subframes(enc_1600, pcm[1600:3200], mode_header=MODE_HEADERS[1600])
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batch_1600 = batch_subframes_pyxis_style(subframes_1600, MODE_HEADERS[1600])
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wire_1600 = build_pyxis_audio_packet(batch_1600)
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# Decode both with a single Python LXST decoder (should auto-switch)
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decoder = LXSTCodec2(mode=3200)
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result_1 = parse_lxst_python_rx(wire_3200)
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decoded_1 = decoder.decode(result_1["frames"][0][1])
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assert decoded_1.shape[0] == 1600 # 10 * 160
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result_2 = parse_lxst_python_rx(wire_1600)
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decoded_2 = decoder.decode(result_2["frames"][0][1])
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# 1600 bps: SPF=320, 1600 samples / 320 = 5 sub-frames
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assert decoded_2.shape[0] == 1600 # 5 * 320
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