More informative errors when opj_start_compress fails.

[libdcp.git] / src / j2k.cc

diff --git a/src/j2k.cc b/src/j2k.cc
index 15f360c581a549777dab5687c67a2c454bed9a70..4a154574db331840dfb8b89986249ae1475c5f9c 100644 (file)
--- a/src/j2k.cc
+++ b/src/j2k.cc
@@ -301,7 +301,12 @@ dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frame
        opj_stream_set_user_data (stream, buffer, write_free_function);
 
        if (!opj_start_compress (encoder, xyz->opj_image(), stream)) {
-               throw MiscError ("could not start JPEG2000 encoding");
+               if ((errno & 0x61500) == 0x61500) {
+                       /* We've had one of the magic error codes from our patched openjpeg */
+                       throw MiscError (String::compose ("could not start JPEG2000 encoding (%1)", errno & 0xff));
+               } else {
+                       throw MiscError ("could not start JPEG2000 encoding");
+               }
        }
 
        if (!opj_encode (encoder, stream)) {