!2 【轻量级 PR】：define error codes with enum instead of const for simplicity and uniformity

Merge pull request !2 from Gymee/N/A

include/media_errors.h

@@ -41,12 +41,12 @@
 
 namespace OHOS {
 namespace Media {
-constexpr int MODULE_MEDIA = 1;
-constexpr int SUBSYS_MEDIA = 30;
+constexpr int32_t MODULE_MEDIA = 1;
+constexpr int32_t SUBSYS_MEDIA = 30;
 
 using ErrCode = int32_t;
-constexpr int SUBSYSTEM_BIT_NUM = 21;
-constexpr int MODULE_BIT_NUM = 16;
+constexpr int32_t SUBSYSTEM_BIT_NUM = 21;
+constexpr int32_t MODULE_BIT_NUM = 16;
 
 /**
  * @brief Generates a start error code with a unique identifier based on specified subsystem and module bit numbers.
@@ -64,41 +64,32 @@ constexpr ErrCode ErrCodeOffset(unsigned int subsystem, unsigned int module = 0)
 
 constexpr int32_t BASE_MEDIA_ERR_OFFSET = ErrCodeOffset(SUBSYS_MEDIA, MODULE_MEDIA);
 
-/** Invalid data size that has been read */
-const int32_t  ERR_INVALID_READ = -1;
-
-/** Success */
-const int32_t  SUCCESS = 0;
-
-/** Fail */
-const int32_t  ERROR = BASE_MEDIA_ERR_OFFSET;
-
-/** Status error */
-const int32_t  ERR_ILLEGAL_STATE = BASE_MEDIA_ERR_OFFSET + 1;
-
-/** Invalid parameter */
-const int32_t  ERR_INVALID_PARAM = BASE_MEDIA_ERR_OFFSET + 2;
-
-/** Early media preparation */
-const int32_t  ERR_EARLY_PREPARE = BASE_MEDIA_ERR_OFFSET + 3;
-
-/** No media source */
-const int32_t  ERR_SOURCE_NOT_SET = BASE_MEDIA_ERR_OFFSET + 4;
-
-/** Invalid operation */
-const int32_t  ERR_INVALID_OPERATION = BASE_MEDIA_ERR_OFFSET + 5;
-
-/** No idle channel */
-const int32_t  ERR_NOFREE_CHANNEL = BASE_MEDIA_ERR_OFFSET + 6;
-
-/** Buffer reading failed */
-const int32_t  ERR_READ_BUFFER = BASE_MEDIA_ERR_OFFSET + 7;
-
-/**  Device not started */
-const int32_t  ERR_NOT_STARTED = BASE_MEDIA_ERR_OFFSET + 8;
-
-/** Unknown error */
-const int32_t  ERR_UNKNOWN = BASE_MEDIA_ERR_OFFSET + 200;
+enum MediaErrorCode : int32_t {
+    /** Invalid data size that has been read */
+    ERR_INVALID_READ = -1,
+    /** Success */
+    SUCCESS = 0,
+    /** Fail */
+    ERROR = BASE_MEDIA_ERR_OFFSET,
+    /** Status error */
+    ERR_ILLEGAL_STATE = BASE_MEDIA_ERR_OFFSET + 1,
+    /** Invalid parameter */
+    ERR_INVALID_PARAM = BASE_MEDIA_ERR_OFFSET + 2,
+    /** Early media preparation */
+    ERR_EARLY_PREPARE = BASE_MEDIA_ERR_OFFSET + 3,
+    /** No media source */
+    ERR_SOURCE_NOT_SET = BASE_MEDIA_ERR_OFFSET + 4,
+    /** Invalid operation */
+    ERR_INVALID_OPERATION = BASE_MEDIA_ERR_OFFSET + 5,
+    /** No idle channel */
+    ERR_NOFREE_CHANNEL = BASE_MEDIA_ERR_OFFSET + 6,
+    /** Buffer reading failed */
+    ERR_READ_BUFFER = BASE_MEDIA_ERR_OFFSET + 7,
+    /**  Device not started */
+    ERR_NOT_STARTED = BASE_MEDIA_ERR_OFFSET + 8,
+    /** Unknown error */
+    ERR_UNKNOWN = BASE_MEDIA_ERR_OFFSET + 200,
+};
 }  // namespace Media
 }  // namespace OHOS
 #endif  // MEDIA_ERRORS_H