Use a predictable RNG when adding noise to low-bitrate images.

[dcpomatic.git] / test / torture_test.cc

diff --git a/test/torture_test.cc b/test/torture_test.cc
index 232435363171187dc01f92d94bfbab85e6a93eda..434ed0b5ec408228264fd920bacf9525d3c952e3 100644 (file)
--- a/test/torture_test.cc
+++ b/test/torture_test.cc
@@ -234,7 +234,7 @@ BOOST_AUTO_TEST_CASE (torture_test1)
 
        shared_ptr<dcp::MonoPictureAssetReader> picture_reader = picture->start_read ();
 
-       /* First 5 * 24 = 120 frames should be black */
+       /* First 5 * 24 = 120 frames should be black, possibly with a little noise to raise the bitrate */
 
        shared_ptr<dcp::OpenJPEGImage> ref;
        for (int i = 0; i < 120; ++i) {
@@ -242,15 +242,17 @@ BOOST_AUTO_TEST_CASE (torture_test1)
                shared_ptr<dcp::OpenJPEGImage> image = fr->xyz_image ();
                dcp::Size const size = image->size ();
                if (i == 0) {
+                       /* Check the first frame pixel by pixel... */
                        for (int c = 0; c < 3; ++c) {
                                for (int y = 0; y < size.height; ++y) {
                                        for (int x = 0; x < size.width; ++x) {
-                                               BOOST_REQUIRE_EQUAL (image->data(c)[y * size.height + x], 0);
+                                               BOOST_REQUIRE (image->data(c)[y * size.height + x] <= 3);
                                        }
                                }
                        }
                        ref = image;
                } else {
+                       /* ... then all the others should be the same */
                        for (int c = 0; c < 3; ++c) {
                                BOOST_REQUIRE_MESSAGE (
                                        memcmp (image->data(c), ref->data(c), size.width * size.height * sizeof(int)) == 0,
@@ -260,7 +262,7 @@ BOOST_AUTO_TEST_CASE (torture_test1)
                }
        }
 
-       /* Then 24 red */
+       /* Then 24 red, perhaps also with some noise */
 
        for (int i = 120; i < 144; ++i) {
                shared_ptr<const dcp::MonoPictureFrame> fr = picture_reader->get_frame (i);
@@ -270,15 +272,15 @@ BOOST_AUTO_TEST_CASE (torture_test1)
                        for (int y = 0; y < size.height; ++y) {
                                for (int x = 0; x < size.width; ++x) {
                                        BOOST_REQUIRE_MESSAGE (
-                                               abs(image->data(0)[y * size.height + x] - 2808) <= 2,
+                                               abs(image->data(0)[y * size.height + x] - 2808) <= 5,
                                                "failed on frame " << i << " with image data " << image->data(0)[y * size.height + x]
                                                );
                                        BOOST_REQUIRE_MESSAGE (
-                                               abs(image->data(1)[y * size.height + x] - 2176) <= 2,
+                                               abs(image->data(1)[y * size.height + x] - 2176) <= 5,
                                                "failed on frame " << i << " with image data " << image->data(1)[y * size.height + x]
                                                );
                                        BOOST_REQUIRE_MESSAGE (
-                                               abs(image->data(2)[y * size.height + x] - 865) <= 2,
+                                               abs(image->data(2)[y * size.height + x] - 865) <= 5,
                                                "failed on frame " << i << " with image data " << image->data(2)[y * size.height + x]
                                                );
                                }