+ ASDCP::JP2K::MXFSReader reader;
+ if (ASDCP_FAILURE (reader.OpenRead (mxf_path.c_str()))) {
+ throw FileError ("could not open MXF file for reading", mxf_path);
+ }
+
+ /* XXX: unfortunate guesswork on this buffer size */
+ _buffer = new ASDCP::JP2K::SFrameBuffer (4 * Kumu::Megabyte);
+
+ if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer))) {
+ throw DCPReadError ("could not read video frame");
+ }
+}
+
+StereoPictureFrame::~StereoPictureFrame ()
+{
+ delete _buffer;
+}
+
+/** @param reduce a factor by which to reduce the resolution
+ * of the image, expressed as a power of two (pass 0 for no
+ * reduction).
+ *
+ * @param eye Eye to return (EYE_LEFT or EYE_RIGHT).
+ *
+ * @return An ARGB representation of one of the eyes (left or right)
+ * of this frame. This is ARGB in the Cairo sense, so that each
+ * pixel takes up 4 bytes; the first byte is blue, second green,
+ * third red and fourth alpha (always 255).
+ *
+ */
+shared_ptr<ARGBFrame>
+StereoPictureFrame::argb_frame (Eye eye, int reduce) const
+{
+ opj_image_t* xyz_frame = 0;
+ switch (eye) {
+ case LEFT:
+ xyz_frame = decompress_j2k (const_cast<uint8_t*> (_buffer->Left.RoData()), _buffer->Left.Size(), reduce);
+ break;
+ case RIGHT:
+ xyz_frame = decompress_j2k (const_cast<uint8_t*> (_buffer->Right.RoData()), _buffer->Right.Size(), reduce);
+ break;
+ }
+
+ assert (xyz_frame->numcomps == 3);
+ shared_ptr<ARGBFrame> f = xyz_to_rgb (xyz_frame);
+ opj_image_destroy (xyz_frame);
+ return f;