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GitOrigin-RevId: 7e1d382a1788ebd8412c5626581b4c4cf2fe75ea
2021-11-16 14:32:04 -05:00
parent f4e7f6cc48
commit cf101e62a9
39 changed files with 1102 additions and 233 deletions
@@ -0,0 +1,28 @@
+#ifndef MEDIAPIPE_FRAMEWORK_FORMATS_TENSOR_INTERNAL_H_
+#define MEDIAPIPE_FRAMEWORK_FORMATS_TENSOR_INTERNAL_H_
+
+#include <cstdint>
+
+namespace mediapipe {
+
+// Generates unique view id at compile-time using FILE and LINE.
+#define TENSOR_UNIQUE_VIEW_ID()                               \
+  static constexpr uint64_t kId = tensor_internal::FnvHash64( \
+      __FILE__, tensor_internal::FnvHash64(TENSOR_INT_TO_STRING(__LINE__)))
+
+namespace tensor_internal {
+
+#define TENSOR_INT_TO_STRING2(x) #x
+#define TENSOR_INT_TO_STRING(x) TENSOR_INT_TO_STRING2(x)
+
+// Compile-time hash function
+// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
+constexpr uint64_t kFnvPrime = 0x00000100000001B3;
+constexpr uint64_t kFnvOffsetBias = 0xcbf29ce484222325;
+constexpr uint64_t FnvHash64(const char* str, uint64_t hash = kFnvOffsetBias) {
+  return (str[0] == 0) ? hash : FnvHash64(str + 1, (hash ^ str[0]) * kFnvPrime);
+}
+}  // namespace tensor_internal
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_FRAMEWORK_FORMATS_TENSOR_INTERNAL_H_