Removed TU delimiter

Added grid examples

testFiles/Apple/multilayer_examples/animals_00_multilayer_a1lx.avif.txt

@@ -26,6 +26,6 @@ aom_codec_control(codec, AOME_SET_SCALEMODE, &{ AOME_NORMAL, AOME_NORMAL })
 AV1 stream contains two operating points. Operating point 0 contains both layers, operating point 1 contains the base layer (layer 0).
 
 Stream is embedded in a HEIF container as a single item, with no lsel or a1op used.
-ispe = 2048x1535
+ispe = 2048x1536
 iloc points to layer 0 and layer 1, separated in two extents
 a1lx property is used to explicitly mark the sizes of the two layers.

testFiles/Apple/multilayer_examples/animals_00_multilayer_grid_a1lx.avif.txt

@@ -0,0 +1,37 @@
+Input image is animals_00 from the Apple test set, rotated to upright (i.e. 180 degrees) and downscaled to 2048x1536 so encoding is faster.
+
+Image is split into 4 tiles of size 1024x768, where each tile is encoded as follows:
+
+AV1 is encoded using libaom and the following settings:
+rc_end_usage = AOM_Q
+g_error_resilient = 0
+g_lag_in_frames = 0
+save_as_annexb = 0
+aom_codec_control(codec, AOME_SET_NUMBER_SPATIAL_LAYERS, 2)
+aom_codec_control(codec, AV1E_SET_COLOR_RANGE, 1)
+
+Layer 0:
+flags = AOM_EFLAG_FORCE_KF
+aom_codec_control(codec, AOME_SET_CQ_LEVEL, 62)
+aom_codec_control(codec, AOME_SET_SCALEMODE, &{ AOME_ONETWO, AOME_ONETWO })
+
+Layer 1:
+flags = AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+ AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+ AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+ AOM_EFLAG_NO_UPD_GF | AOM_EFLAG_NO_UPD_ARF |
+ AOM_EFLAG_NO_UPD_ENTROPY;
+aom_codec_control(codec, AOME_SET_CQ_LEVEL, 3)
+aom_codec_control(codec, AOME_SET_SCALEMODE, &{ AOME_NORMAL, AOME_NORMAL })
+
+AV1 streams contains two operating points. Operating point 0 contains both layers, operating point 1 contains the base layer (layer 0).
+
+Stream is embedded in a HEIF container as follows:
+item 1:
+ grid
+ ispe = 2048x1536
+ references to items 2-5
+items 2-5:
+ ispe = 1024x1536
+ iloc points to layer 0 and layer 1, separated in two extents
+ a1lx property is used to explicitly mark the sizes of the two layers.

testFiles/Apple/multilayer_examples/animals_00_multilayer_grid_lsel.avif.txt

@@ -0,0 +1,45 @@
+Input image is animals_00 from the Apple test set, rotated to upright (i.e. 180 degrees) and downscaled to 2048x1536 so encoding is faster.
+
+Image is split into 4 tiles of size 1024x768, where each tile is encoded as follows:
+
+AV1 is encoded using libaom and the following settings:
+rc_end_usage = AOM_Q
+g_error_resilient = 0
+g_lag_in_frames = 0
+save_as_annexb = 0
+aom_codec_control(codec, AOME_SET_NUMBER_SPATIAL_LAYERS, 2)
+aom_codec_control(codec, AV1E_SET_COLOR_RANGE, 1)
+
+Layer 0:
+flags = AOM_EFLAG_FORCE_KF
+aom_codec_control(codec, AOME_SET_CQ_LEVEL, 62)
+aom_codec_control(codec, AOME_SET_SCALEMODE, &{ AOME_ONETWO, AOME_ONETWO })
+
+Layer 1:
+flags = AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+ AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+ AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+ AOM_EFLAG_NO_UPD_GF | AOM_EFLAG_NO_UPD_ARF |
+ AOM_EFLAG_NO_UPD_ENTROPY;
+aom_codec_control(codec, AOME_SET_CQ_LEVEL, 3)
+aom_codec_control(codec, AOME_SET_SCALEMODE, &{ AOME_NORMAL, AOME_NORMAL })
+
+AV1 streams contains two operating points. Operating point 0 contains both layers, operating point 1 contains the base layer (layer 0).
+
+Stream is embedded in a HEIF container as follows:
+item 1:
+ grid
+ ispe = 2048x1536
+ references to items 3-6
+item 2:
+ grid
+ ispe = 1024x738
+ references to items 7-10
+items 3-6:
+ ispe = 1024x1536
+ iloc points to layer 0 and layer 1, separated in two extents
+ lsel property selects layer 1
+items 7-10:
+ ispe = 1024x1536
+ iloc points to layer 0 and layer 1, separated in two extents
+ lsel property selects layer 0