screencapturekit 10.0.2

//! `AudioBuffer` and `AudioBufferList` tests

use screencapturekit::cm::{AudioBuffer, AudioBufferList};

#[test]
fn test_audio_buffer_display() {
    // We can't easily construct an AudioBuffer directly, but we can test the Display impl
    // by testing the format string pattern
    let format = "AudioBuffer(2 channels, 1024 bytes)";
    assert!(format.contains("channels"));
    assert!(format.contains("bytes"));
}

#[test]
fn test_audio_buffer_equality() {
    // AudioBuffer implements PartialEq based on channels, size, and pointer
    // We verify the trait is implemented
    fn assert_eq_impl<T: PartialEq>() {}
    assert_eq_impl::<AudioBuffer>();
}

#[test]
fn test_audio_buffer_hash() {
    // AudioBuffer implements Hash
    fn assert_hash_impl<T: std::hash::Hash>() {}
    assert_hash_impl::<AudioBuffer>();
}

/// The raw fields are private on purpose: they are a `(pointer, length)` pair
/// that [`AudioBuffer::data`] turns into a slice, so writable public fields
/// would let safe code build an out-of-bounds slice.
#[test]
fn test_audio_buffer_exposes_read_only_accessors() {
    fn accessors(buffer: &AudioBuffer) -> (u32, usize, usize) {
        (
            buffer.number_channels(),
            buffer.data_byte_size(),
            buffer.data().len(),
        )
    }
    // Compile-time check only; there is no way to build an AudioBuffer outside
    // the bridge, which is exactly the invariant being asserted.
    let _ = accessors;
}

/// Mutable bytes stay tied to the owning list and remain unsafe because the
/// source sample and independently-created lists may alias the same memory.
#[test]
fn test_audio_buffer_list_data_mut_is_owner_tied_and_unsafe() {
    fn mutate(list: &mut AudioBufferList, index: usize) -> Option<usize> {
        unsafe { list.data_mut(index) }.map(|bytes| bytes.len())
    }
    let _ = mutate;
}

/// A `CMSampleBuffer` with no audio must yield `None`, not an empty list built
/// from an inconsistent `(count, pointer, length)` triple.
#[test]
fn test_audio_buffer_list_is_none_for_video_sample() {
    use screencapturekit::cm::{CMSampleBufferExt, CMTime};
    use screencapturekit::cv::CVPixelBuffer;

    let Ok(pixel_buffer) = CVPixelBuffer::create(64, 64, 0x4247_5241) else {
        println!("⚠ Skipping - pixel buffer creation failed");
        return;
    };
    let Ok(sample) = screencapturekit::cm::CMSampleBuffer::create_for_image_buffer(
        &pixel_buffer,
        CMTime::new(0, 600),
        CMTime::new(1, 600),
    ) else {
        println!("⚠ Skipping - sample buffer creation failed");
        return;
    };

    assert!(sample.audio_buffer_list().is_none());
}