-// for (unsigned int j = 0; j < ASDCP::JP2K::MaxComponents; ++j) {
-// if (desc_A.ImageComponents[j] != desc_B.ImageComponents[j]) {
-// notes.pack_start ("video MXF picture descriptors differ");
-// }
-// }
-
-
- ASDCP::JP2K::FrameBuffer buffer_A (4 * Kumu::Megabyte);
- ASDCP::JP2K::FrameBuffer buffer_B (4 * Kumu::Megabyte);
-
- for (int i = 0; i < _length; ++i) {
- if (ASDCP_FAILURE (reader_A.ReadFrame (i, buffer_A))) {
- throw DCPReadError ("could not read video frame");
- }
-
- if (ASDCP_FAILURE (reader_B.ReadFrame (i, buffer_B))) {
- throw DCPReadError ("could not read video frame");
- }
-
- bool j2k_same = true;
-
- if (buffer_A.Size() != buffer_B.Size()) {
- notes.push_back ("sizes of video data for frame " + lexical_cast<string>(i) + " differ");
- j2k_same = false;
- } else if (memcmp (buffer_A.RoData(), buffer_B.RoData(), buffer_A.Size()) != 0) {
- notes.push_back ("J2K data for frame " + lexical_cast<string>(i) + " differ");
- j2k_same = false;
- }
-
- if (!j2k_same) {
-
- if (opt.verbose) {
- cout << "J2K images for " << i << " differ; checking by pixel\n";
- }
-
- /* Decompress the images to bitmaps */
- opj_image_t* image_A = decompress_j2k (const_cast<uint8_t*> (buffer_A.RoData()), buffer_A.Size ());
- opj_image_t* image_B = decompress_j2k (const_cast<uint8_t*> (buffer_B.RoData()), buffer_B.Size ());
-
- /* Compare them */
-
- if (image_A->numcomps != image_B->numcomps) {
- notes.push_back ("image component counts for frame " + lexical_cast<string>(i) + " differ");
- }
-
- vector<int> abs_diffs (image_A->comps[0].w * image_A->comps[0].h * image_A->numcomps);
- int d = 0;
- int max_diff = 0;
-
- for (int c = 0; c < image_A->numcomps; ++c) {
-
- if (image_A->comps[c].w != image_B->comps[c].w || image_A->comps[c].h != image_B->comps[c].h) {
- notes.push_back ("image sizes for frame " + lexical_cast<string>(i) + " differ");
- }
-
- int const pixels = image_A->comps[c].w * image_A->comps[c].h;
- for (int j = 0; j < pixels; ++j) {
- int const t = abs (image_A->comps[c].data[j] - image_B->comps[c].data[j]);
- abs_diffs[d++] = t;
- max_diff = max (max_diff, t);
- }
- }
-
- uint64_t total = 0;
- for (vector<int>::iterator j = abs_diffs.begin(); j != abs_diffs.end(); ++j) {
- total += *j;
- }
-
- double const mean = double (total) / abs_diffs.size ();
-
- uint64_t total_squared_deviation = 0;
- for (vector<int>::iterator j = abs_diffs.begin(); j != abs_diffs.end(); ++j) {
- total_squared_deviation += pow (*j - mean, 2);
- }
-
- double const std_dev = sqrt (double (total_squared_deviation) / abs_diffs.size());
-
- if (mean > opt.max_mean_pixel_error || std_dev > opt.max_std_dev_pixel_error) {
- notes.push_back ("mean or standard deviation out of range for " + lexical_cast<string>(i));
- }
-
- if (opt.verbose) {
- cout << "\tmax pixel error " << max_diff << ", mean pixel error " << mean << ", standard deviation " << std_dev << "\n";
- }
-
- opj_image_destroy (image_A);
- opj_image_destroy (image_B);
- }
- }