Fixed several issues with cropping. (#275)

* * rocDecode: Fixed several issues with cropping.
  - Fixed the pixel start offset error on streams with non-zero top/left cropping in MD5 calculation.
  - Fixed the pixel start offset error on streams with non-zero top/left cropping, and/or with user specified cropping in YUV frame output.
  - Sorted out code which deals with cropping area specifiied by the bitstream, and cropping area specified by the user.

* * rocDecode: Additional changes after discussion.
 - Set display rect for decoder create/reconfig to displayable area or user specified ROI area.
 - Do not set target rect for decoder create/reconfig. Leave it for future use.
 - Unified naming of display rect in decoder create/reconfig structs.

* * rocDecode: Put back the extra rounding to target width/height specifiied by the coded stream, for peace of mind, based on code review.

* * rocDecode: Added the missing stream specified cropping offset to the starting pixel pointer for none-internal memory modes.

---------

Co-authored-by: Aryan Salmanpour <aryan.salmanpour@amd.com>

[ROCm/rocdecode commit: e4614de461]

projects/rocdecode/samples/videoDecodeMultiFiles/videodecodemultifiles.cpp

@@ -144,8 +144,8 @@ void ParseCommandLine(std::deque<FileInfo> *multi_file_data, int &device_id, boo
         } else if (!strcmp(param, "flush")) {
             file_data.b_flush_last_frames = atoi(value) ? true : false;
         } else if (!strcmp(param, "crop")) {
-            sscanf(value, "%d,%d,%d,%d", &file_data.crop_rect.l, &file_data.crop_rect.t, &file_data.crop_rect.r, &file_data.crop_rect.b);
-            if ((file_data.crop_rect.r - file_data.crop_rect.l) % 2 == 1 || (file_data.crop_rect.b - file_data.crop_rect.t) % 2 == 1) {
+            sscanf(value, "%d,%d,%d,%d", &file_data.crop_rect.left, &file_data.crop_rect.top, &file_data.crop_rect.right, &file_data.crop_rect.bottom);
+            if ((file_data.crop_rect.right - file_data.crop_rect.left) % 2 == 1 || (file_data.crop_rect.bottom - file_data.crop_rect.top) % 2 == 1) {
                 std::cout << "Cropping rect must have width and height of even numbers" << std::endl;
                 exit(1);
             }