corrscope/tests/test_channel.py

from contextlib import ExitStack
from typing import Optional, List
from unittest.mock import patch

import hypothesis.strategies as hs
import numpy as np
import pytest
from hypothesis import given

import corrscope.channel
import corrscope.corrscope
from corrscope.channel import ChannelConfig, Channel, DefaultLabel
from corrscope.corrscope import template_config, CorrScope, BenchmarkMode, Arguments
from corrscope.renderer import RenderInput
from corrscope.triggers import NullTriggerConfig
from corrscope.util import coalesce
from corrscope.wave import Flatten


positive = hs.integers(min_value=1, max_value=100)
real = hs.floats(min_value=0, max_value=100)
maybe_real = hs.one_of(hs.none(), real)
bools = hs.booleans()
default_labels = hs.sampled_from(DefaultLabel)


@given(
    # Channel
    c_amplification=maybe_real,
    c_trigger_width=positive,
    c_render_width=positive,
    # Global
    amplification=real,
    trigger_ms=positive,
    render_ms=positive,
    tsub=positive,
    rsub=positive,
    default_label=hs.sampled_from(DefaultLabel),
    override_label=bools,
)
def test_config_channel_integration(
    # Channel
    c_amplification: Optional[float],
    c_trigger_width: int,
    c_render_width: int,
    # Global
    amplification: float,
    trigger_ms: int,
    render_ms: int,
    tsub: int,
    rsub: int,
    default_label: DefaultLabel,
    override_label: bool,
):
    """(Tautologically) verify:
    - channel.  r_samp (given cfg)
    - channel.t/r_stride (given cfg.*_subsampling/*_width)
    - trigger._tsamp, _stride
    - renderer's method calls(samp, stride)
    - rendered label (channel.label, given cfg, corr_cfg.default_label)
    """

    with ExitStack() as stack:
        # region setup test variables
        corrscope.corrscope.PRINT_TIMESTAMP = False  # Cleanup Hypothesis testing logs

        Wave = stack.enter_context(patch.object(corrscope.channel, "Wave"))
        wave = Wave.return_value

        def get_around(sample: int, return_nsamp: int, stride: int):
            return np.zeros(return_nsamp)

        wave.get_around.side_effect = get_around
        wave.with_flatten.return_value = wave
        wave.nsamp = 10000
        wave.smp_s = 48000

        ccfg = ChannelConfig(
            "tests/sine440.wav",
            trigger_width=c_trigger_width,
            render_width=c_render_width,
            amplification=c_amplification,
            label="label" if override_label else "",
        )

        def get_cfg():
            return template_config(
                trigger_ms=trigger_ms,
                render_ms=render_ms,
                trigger_subsampling=tsub,
                render_subsampling=rsub,
                amplification=amplification,
                channels=[ccfg],
                default_label=default_label,
                trigger=NullTriggerConfig(),
                benchmark_mode=BenchmarkMode.OUTPUT,
            )

        # endregion

        cfg = get_cfg()
        channel = Channel(ccfg, cfg)

        # Ensure cfg.width_ms etc. are correct
        assert cfg.trigger_ms == trigger_ms
        assert cfg.render_ms == render_ms

        # Ensure channel.window_samp, trigger_subsampling, render_subsampling are correct.
        def ideal_samp(width_ms, sub):
            width_s = width_ms / 1000
            return pytest.approx(
                round(width_s * channel.trigger_wave.smp_s / sub), rel=1e-6
            )

        ideal_tsamp = ideal_samp(cfg.trigger_ms, tsub)
        ideal_rsamp = ideal_samp(cfg.render_ms, rsub)
        assert channel._render_samp == ideal_rsamp

        assert channel._trigger_stride == tsub * c_trigger_width
        assert channel.render_stride == rsub * c_render_width

        # Ensure amplification override works
        args, kwargs = Wave.call_args
        assert kwargs["amplification"] == coalesce(c_amplification, amplification)

        ## Ensure trigger uses channel.window_samp and _trigger_stride.
        trigger = channel.trigger
        assert trigger._tsamp == ideal_tsamp
        assert trigger._stride == channel._trigger_stride

        ## Ensure corrscope calls render using channel._render_samp and _render_stride.
        corr = CorrScope(cfg, Arguments(cfg_dir=".", outputs=[]))
        renderer = stack.enter_context(
            patch.object(CorrScope, "_load_renderer")
        ).return_value
        corr.play()

    # Only Channel.get_render_around() (not NullTrigger) calls wave.get_around().
    (_sample, _return_nsamp, _subsampling), kwargs = wave.get_around.call_args
    assert _return_nsamp == channel._render_samp
    assert _subsampling == channel.render_stride

    # Inspect arguments to renderer.update_main_lines()
    datas: List[RenderInput]
    (datas, *args), kwargs = renderer.update_main_lines.call_args
    render_inputs = datas[0]
    assert len(render_inputs.data) == channel._render_samp

    # Inspect arguments to renderer.add_labels().
    (labels,), kwargs = renderer.add_labels.call_args
    label = labels[0]
    if override_label:
        assert label == "label"
    else:
        if default_label is DefaultLabel.FileName:
            assert label == "sine440"
        elif default_label is DefaultLabel.Number:
            assert label == "1"
        else:
            assert label == ""


# line_color is tested in test_renderer.py


@pytest.mark.parametrize("filename", ["tests/sine440.wav", "tests/stereo in-phase.wav"])
@pytest.mark.parametrize(
    ("global_stereo", "chan_stereo"),
    [
        [Flatten.SumAvg, None],
        [Flatten.Stereo, None],
        [Flatten.SumAvg, Flatten.Stereo],
        [Flatten.Stereo, Flatten.SumAvg],
        [Flatten.Stereo, "1 0"],
    ],
)
def test_per_channel_stereo(
    filename: str, global_stereo: Flatten, chan_stereo: Optional[Flatten]
):
    """Ensure you can enable/disable stereo on a per-channel basis."""
    stereo = coalesce(chan_stereo, global_stereo)

    # Test render wave.
    cfg = template_config(render_stereo=global_stereo)
    ccfg = ChannelConfig("tests/stereo in-phase.wav", render_stereo=chan_stereo)
    channel = Channel(ccfg, cfg)

    # Render wave *must* return stereo.
    assert channel.render_wave[0:1].ndim == 2
    data = channel.render_wave.get_around(0, return_nsamp=4, stride=1)
    assert data.ndim == 2

    if "stereo" in filename:
        assert channel.render_wave._flatten == stereo
        assert data.shape[1] == (2 if stereo is Flatten.Stereo else 1)