MD5 digest generation support (#109)

* * rocDecode/HEVC: Added support for MD5 message digest generation.
  - Command option "-md5" triggers MD5 calculation and output.

* * rocDecode/HEVC: Changed C type casting to C++ type casting.

[ROCm/rocdecode commit: ad20961c4a]

projects/rocdecode/samples/videoDecode/videodecode.cpp

@@ -43,6 +43,7 @@ void ShowHelpAndExit(const char *option = NULL) {
     << "-d GPU device ID (0 for the first device, 1 for the second, etc.); optional; default: 0" << std::endl
     << "-z force_zero_latency (force_zero_latency, Decoded frames will be flushed out for display immediately); optional;" << std::endl
     << "-sei extract SEI messages; optional;" << std::endl
+    << "-md5 generate MD5 message digest on the decoded YUV image sequence; optional;" << std::endl
     << "-crop crop rectangle for output (not used when using interopped decoded frame); optional; default: 0" << std::endl
     << "-m output_surface_memory_type - decoded surface memory; optional; default - 0"
     << " [0 : OUT_SURFACE_MEM_DEV_INTERNAL/ 1 : OUT_SURFACE_MEM_DEV_COPIED/ 2 : OUT_SURFACE_MEM_HOST_COPIED]" << std::endl;
@@ -56,6 +57,7 @@ int main(int argc, char **argv) {
     int device_id = 0;
     bool b_force_zero_latency = false;     // false by default: enabling this option might affect decoding performance
     bool b_extract_sei_messages = false;
+    bool b_generate_md5 = false;
     Rect crop_rect = {};
     Rect *p_crop_rect = nullptr;
     OutputSurfaceMemoryType mem_type = OUT_SURFACE_MEM_DEV_INTERNAL;        // set to internal
@@ -103,6 +105,13 @@ int main(int argc, char **argv) {
             b_extract_sei_messages = true;
             continue;
         }
+        if (!strcmp(argv[i], "-md5")) {
+            if (i == argc) {
+                ShowHelpAndExit("-md5");
+            }
+            b_generate_md5 = true;
+            continue;
+        }
         if (!strcmp(argv[i], "-crop")) {
             if (++i == argc || 4 != sscanf(argv[i], "%d,%d,%d,%d", &crop_rect.l, &crop_rect.t, &crop_rect.r, &crop_rect.b)) {
                 ShowHelpAndExit("-crop");
@@ -146,6 +155,10 @@ int main(int argc, char **argv) {
         uint32_t width, height;
         double total_dec_time = 0;
 
+        if (b_generate_md5) {
+            viddec.InitMd5();
+        }
+
         do {
             auto start_time = std::chrono::high_resolution_clock::now();
             demuxer.Demux(&pvideo, &n_video_bytes, &pts);
@@ -163,6 +176,9 @@ int main(int argc, char **argv) {
             }
             for (int i = 0; i < n_frame_returned; i++) {
                 pframe = viddec.GetFrame(&pts);
+                if (b_generate_md5) {
+                    viddec.UpdateMd5ForFrame(pframe, surf_info);
+                }
                 if (dump_output_frames) {
                     viddec.SaveFrameToFile(output_file_path, pframe, surf_info);
                 }
@@ -177,6 +193,15 @@ int main(int argc, char **argv) {
             std::cout << "info: avg decoding time per frame (ms): " << total_dec_time / n_frame << std::endl;
             std::cout << "info: avg FPS: " << (n_frame / total_dec_time) * 1000 << std::endl;
         }
+        if (b_generate_md5) {
+            uint8_t *digest;
+            viddec.FinalizeMd5(&digest);
+            std::cout << "MD5 message digest: ";
+            for (int i = 0; i < 16; i++) {
+                std::cout << std::hex << static_cast<int>(digest[i]);
+            }
+            std::cout << std::endl;
+        }
     } catch (const std::exception &ex) {
       std::cout << ex.what() << std::endl;
       exit(1);