+ if (enc.size() >= minimum_size) {
+ LOG_GENERAL (N_("Frame %1 encoded size was OK (%2)"), _index, enc.size());
+ break;
+ }
+
+ LOG_GENERAL (N_("Frame %1 encoded size was small (%2); adding noise at level %3 with pixel skip %4"), _index, enc.size(), noise_amount, pixel_skip);
+
+ /* The JPEG2000 is too low-bitrate for some decoders <cough>DSS200</cough> so add some noise
+ * and try again. This is slow but hopefully won't happen too often. We have to do
+ * convert_to_xyz() again because compress_j2k() corrupts its xyz parameter.
+ */
+
+ xyz = convert_to_xyz (_frame, boost::bind(&Log::dcp_log, dcpomatic_log.get(), _1, _2));
+ auto size = xyz->size ();
+ auto pixels = size.width * size.height;
+ dcpomatic::RNG rng(42);
+ for (auto c = 0; c < 3; ++c) {
+ auto p = xyz->data(c);
+ auto e = xyz->data(c) + pixels;
+ while (p < e) {
+ *p = std::min(4095, std::max(0, *p + (rng.get() % noise_amount)));
+ p += pixel_skip;
+ }
+ }
+
+ if (pixel_skip > 1) {
+ --pixel_skip;
+ } else {
+ ++noise_amount;
+ }
+ /* Something's gone badly wrong if this much noise doesn't help */
+ DCPOMATIC_ASSERT (noise_amount < 16);
+ }
+