More video work, planning, etc. -- Need to mark things EXPERIMENTAL.

tests/test_stegasoo.py

@@ -451,3 +451,231 @@ class TestEdgeCases:
         )
 
         assert decoded.message == special_msg
+
+
+# =============================================================================
+# VIDEO STEGANOGRAPHY TESTS (v4.4.0)
+# =============================================================================
+
+
+@pytest.fixture
+def test_video_bytes():
+    """Create a minimal test video using ffmpeg.
+
+    Creates a 2-second test video with solid color frames.
+    Returns None if ffmpeg is not available.
+    """
+    import shutil
+    import subprocess
+    import tempfile
+
+    if not shutil.which("ffmpeg"):
+        return None
+
+    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as f:
+        output_path = f.name
+
+    try:
+        # Create a simple 2-second video with colored frames
+        # Using lavfi (libavfilter) to generate test pattern
+        result = subprocess.run(
+            [
+                "ffmpeg",
+                "-y",
+                "-f",
+                "lavfi",
+                "-i",
+                "color=c=blue:s=320x240:d=2:r=10",
+                "-c:v",
+                "libx264",
+                "-pix_fmt",
+                "yuv420p",
+                "-g",
+                "5",  # GOP size - creates I-frames every 5 frames
+                output_path,
+            ],
+            capture_output=True,
+            timeout=30,
+        )
+
+        if result.returncode != 0:
+            return None
+
+        with open(output_path, "rb") as f:
+            video_data = f.read()
+
+        return video_data
+    except Exception:
+        return None
+    finally:
+        import os
+
+        try:
+            os.unlink(output_path)
+        except OSError:
+            pass
+
+
+class TestVideoSupport:
+    """Test video steganography support detection."""
+
+    def test_video_support_flag_exists(self):
+        """HAS_VIDEO_SUPPORT flag should exist."""
+        assert hasattr(stegasoo, "HAS_VIDEO_SUPPORT")
+        assert isinstance(stegasoo.HAS_VIDEO_SUPPORT, bool)
+
+    def test_video_constants_exist(self):
+        """Video-related constants should exist."""
+        assert hasattr(stegasoo, "EMBED_MODE_VIDEO_LSB")
+        assert hasattr(stegasoo, "EMBED_MODE_VIDEO_AUTO")
+
+
+@pytest.mark.skipif(
+    not stegasoo.HAS_VIDEO_SUPPORT,
+    reason="Video support not available (ffmpeg or dependencies missing)",
+)
+class TestVideoFormatDetection:
+    """Test video format detection."""
+
+    def test_detect_video_format_mp4(self, test_video_bytes):
+        """Should detect MP4 format from magic bytes."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import detect_video_format
+
+        fmt = detect_video_format(test_video_bytes)
+        assert fmt in ("mp4", "mov")
+
+    def test_detect_video_format_unknown(self):
+        """Should return 'unknown' for non-video data."""
+        from stegasoo import detect_video_format
+
+        fmt = detect_video_format(b"not a video")
+        assert fmt == "unknown"
+
+
+@pytest.mark.skipif(
+    not stegasoo.HAS_VIDEO_SUPPORT,
+    reason="Video support not available (ffmpeg or dependencies missing)",
+)
+class TestVideoInfo:
+    """Test video metadata extraction."""
+
+    def test_get_video_info(self, test_video_bytes):
+        """Should extract video metadata."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import get_video_info
+
+        info = get_video_info(test_video_bytes)
+
+        assert info.width == 320
+        assert info.height == 240
+        assert info.fps > 0
+        assert info.duration_seconds > 0
+        assert info.total_frames > 0
+        assert info.format in ("mp4", "mov")
+
+    def test_validate_video(self, test_video_bytes):
+        """Should validate video data."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import validate_video
+
+        result = validate_video(test_video_bytes, check_duration=False)
+
+        assert result.is_valid
+        assert result.details.get("format") in ("mp4", "mov")
+
+
+@pytest.mark.skipif(
+    not stegasoo.HAS_VIDEO_SUPPORT,
+    reason="Video support not available (ffmpeg or dependencies missing)",
+)
+class TestVideoCapacity:
+    """Test video capacity calculation."""
+
+    def test_calculate_video_capacity(self, test_video_bytes):
+        """Should calculate steganographic capacity."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import calculate_video_capacity
+
+        capacity_info = calculate_video_capacity(test_video_bytes)
+
+        assert capacity_info.total_frames > 0
+        assert capacity_info.i_frames > 0
+        assert capacity_info.usable_capacity_bytes > 0
+        assert capacity_info.embed_mode == "video_lsb"
+        assert capacity_info.resolution == (320, 240)
+
+
+@pytest.mark.skipif(
+    not stegasoo.HAS_VIDEO_SUPPORT,
+    reason="Video support not available (ffmpeg or dependencies missing)",
+)
+class TestVideoEncodeDecode:
+    """Test video steganography round-trip."""
+
+    def test_video_roundtrip(self, test_video_bytes, ref_bytes):
+        """Test encoding and decoding a message in video."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import decode_video, encode_video
+
+        message = "Secret video message!"
+
+        # Encode
+        stego_video, stats = encode_video(
+            message=message,
+            reference_photo=ref_bytes,
+            carrier_video=test_video_bytes,
+            passphrase=TEST_PASSPHRASE,
+            pin=TEST_PIN,
+        )
+
+        assert stego_video
+        assert len(stego_video) > 0
+        assert stats.frames_modified > 0
+        assert stats.codec == "ffv1"  # Should use lossless codec
+
+        # Decode
+        result = decode_video(
+            stego_video=stego_video,
+            reference_photo=ref_bytes,
+            passphrase=TEST_PASSPHRASE,
+            pin=TEST_PIN,
+        )
+
+        assert result.is_text
+        assert result.message == message
+
+    def test_video_wrong_passphrase_fails(self, test_video_bytes, ref_bytes):
+        """Decoding with wrong passphrase should fail."""
+        if test_video_bytes is None:
+            pytest.skip("Could not create test video")
+
+        from stegasoo import decode_video, encode_video
+
+        message = "Secret video message!"
+
+        stego_video, _ = encode_video(
+            message=message,
+            reference_photo=ref_bytes,
+            carrier_video=test_video_bytes,
+            passphrase=TEST_PASSPHRASE,
+            pin=TEST_PIN,
+        )
+
+        with pytest.raises(Exception):
+            decode_video(
+                stego_video=stego_video,
+                reference_photo=ref_bytes,
+                passphrase="wrong passphrase words here",
+                pin=TEST_PIN,
+            )