1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/aom/common/args_helper.h b/third_party/aom/common/args_helper.h
new file mode 100644
index 0000000000..c86a6128d3
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+++ b/third_party/aom/common/args_helper.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2020, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_COMMON_ARGS_HELPER_H_
+#define AOM_COMMON_ARGS_HELPER_H_
+
+#include "aom/aom_encoder.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Maximum length of the error messages for the helper functions.
+#define ARG_ERR_MSG_MAX_LEN 200
+
+struct arg {
+  char **argv;
+  const char *name;
+  const char *val;
+  unsigned int argv_step;
+  const struct arg_def *def;
+};
+
+struct arg_enum_list {
+  const char *name;
+  int val;
+};
+#define ARG_ENUM_LIST_END \
+  { 0 }
+
+typedef struct arg_def {
+  const char *short_name;
+  const char *long_name;
+  int has_val;  //  0: The argument must not have a value.
+                //  1: The argument must have a value.
+                // -1: The argument may or may not have a value.
+  const char *desc;
+  const struct arg_enum_list *enums;
+} arg_def_t;
+#define ARG_DEF(s, l, v, d) \
+  { s, l, v, d, NULL }
+#define ARG_DEF_ENUM(s, l, v, d, e) \
+  { s, l, v, d, e }
+#define ARG_DEF_LIST_END \
+  { 0 }
+
+struct arg arg_init(char **argv);
+
+/*
+ * The helper functions below all take an optional parameter err_msg for
+ * error reporting. When err_msg is not NULL (must point to a buffer
+ * which is at least ARG_ERR_MSG_MAX_LEN bytes long), a related error message is
+ * stored in it if an error occurs. It will be set to an empty string if no
+ * error occurs.
+ */
+int arg_match_helper(struct arg *arg_, const struct arg_def *def, char **argv,
+                     char *err_msg);
+unsigned int arg_parse_uint_helper(const struct arg *arg, char *err_msg);
+int arg_parse_int_helper(const struct arg *arg, char *err_msg);
+struct aom_rational arg_parse_rational_helper(const struct arg *arg,
+                                              char *err_msg);
+int arg_parse_enum_helper(const struct arg *arg, char *err_msg);
+int arg_parse_enum_or_int_helper(const struct arg *arg, char *err_msg);
+int arg_parse_list_helper(const struct arg *arg, int *list, int n,
+                          char *err_msg);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_COMMON_ARGS_HELPER_H_