Updated comments of MPPCommonUtils
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@ -72,42 +72,17 @@ namespace {
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return YES;
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return YES;
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}
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}
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// Creates the NSEror with the appropriate error
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/** Converts the absl status message to an NSString. */
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// MPPTasksErrorCode and message. MPPTasksErrorCode has a one to one
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// mapping with MediaPipeTasksStatus starting from the value 1(MPPTasksErrorCodeError)
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// and hence will be correctly initialized if directly cast from the integer code derived from
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// MediaPipeTasksStatus stored in its payload. MPPTasksErrorCode omits kOk = 0 of
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// MediaPipeTasksStatusx.
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//
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// Stores a string including absl status code and message(if non empty) as the
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// error message See
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// https://github.com/abseil/abseil-cpp/blob/master/absl/status/status.h#L514
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// for explanation. absl::Status::message() can also be used but not always
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// guaranteed to be non empty.
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NSString *description = [NSString
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NSString *description = [NSString
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stringWithCString:status.ToString(absl::StatusToStringMode::kWithNoExtraData).c_str()
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stringWithCString:status.ToString(absl::StatusToStringMode::kWithNoExtraData).c_str()
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encoding:NSUTF8StringEncoding];
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encoding:NSUTF8StringEncoding];
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// Payload of absl::Status created by the MediaPipe task library stores an appropriate value of
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// the enum MediaPipeTasksStatus. The integer value corresponding to the MediaPipeTasksStatus enum
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// stored in the payload is extracted here to later map to the appropriate error code to be
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// returned. In cases where the enum is not stored in (payload is NULL or the payload string
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// cannot be converted to an integer), we set the error code value to be 1
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// (MPPTasksErrorCodeError of MPPTasksErrorCode used in the iOS library to signify
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// any errors not falling into other categories.) Since payload is of type absl::Cord that can be
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// type cast into an absl::optional<std::string>, we use the std::stoi function to convert it into
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// an integer code if possible.
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MPPTasksErrorCode genericErrorCode = MPPTasksErrorCodeUnknownError;
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MPPTasksErrorCode genericErrorCode = MPPTasksErrorCodeUnknownError;
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MPPTasksErrorCode errorCode = genericErrorCode;
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MPPTasksErrorCode errorCode = genericErrorCode;
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// If errorCode is outside the range of enum values possible or is
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/** Maps the absl::StatusCode to the appropriate MPPTasksErrorCode. Note: MPPTasksErrorCode omits
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// MPPTasksErrorCodeError, we try to map the absl::Status::code() to assign
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* absl::StatusCode::kOk. */
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// appropriate MPPTasksErrorCode in default cases. Note:
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// The mapping to absl::Status::code() is done to generate a more specific error code than
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// MPPTasksErrorCodeError in cases when the payload can't be mapped to
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// MPPTasksErrorCode. This can happen when absl::Status returned by TFLite library are in turn
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// returned without modification by MediaPipe cc library methods.
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switch (status.code()) {
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switch (status.code()) {
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case StatusCode::kCancelled:
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case StatusCode::kCancelled:
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errorCode = MPPTasksErrorCodeCancelledError;
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errorCode = MPPTasksErrorCodeCancelledError;
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