acldvppCHW2HWC

Applicability

Function Usage

Converts the shape of the input image from <C, H, W> to <H, W, C>.

Prototype

Each operator has two-phase API calls. First, acldvppCHW2HWCGetWorkspaceSize is called to calculate the required workspace size based on the computation process. Then, acldvppCHW2HWC is called to perform the computation. The two-phase APIs are as follows:

• First-phase API:

  1	acldvppStatus acldvppCHW2HWCGetWorkspaceSize(const aclTensor *self, aclTensor *out, uint64_t *workspaceSize, aclOpExecutor **executor)

• Second-phase API:

  1	acldvppStatus acldvppCHW2HWC(void *workspace, uint64_t workspaceSize, aclOpExecutor *executor, aclrtStream stream)

acldvppCHW2HWCGetWorkspaceSize

• Parameters:
  • self: input tensor of the operator, which is of the aclTensor type created by calling aclCreateTensor (the tensor data is stored on the device). The value of dataType of the input tensor can be UINT8 or FLOAT, the value of Format can be NCHW, and non-contiguous tensors are not supported. The value of N can be 1 or left empty, and the value of C can be 1 or 3 (1: input GRAY image; 3: input RGB image).
  • out: output tensor of the operator, which is of the aclTensor type created by calling aclCreateTensor (the tensor data is stored on the device). The value of dataType of the output tensor can be UINT8 or FLOAT, the value of Format can be NHWC, and non-contiguous tensors are not supported. The value of N can be 1 or left empty, and the value of C can be 1 or 3 (1: input GRAY image; 3: input RGB image). The data type of out must be the same as that of self, and the C, H, and W dimensions of out must be the same as those of self.
  • workspaceSize: size of the workspace to be allocated on the device.
  • executor: operator executor, containing the operator computation process.
• Returns:

  acldvppStatus status code. For details, see acldvpp Return Codes.

acldvppCHW2HWC

• Parameters:
  • workspace: address of the device memory allocated by calling aclrtMalloc. The size of the device memory is specified by workspaceSize.
  • workspaceSize: The value must be the same as that obtained by calling acldvppCHW2HWCGetWorkspaceSize.
  • executor: op executor, which contains the operator computation process and is the same as the executor of acldvppCHW2HWCGetWorkspaceSize.
  • stream: stream for executing a task, which can be a created stream for saving resources or newly created by the aclrtCreateStream API call.
• Returns:

  acldvppStatus status code. For details, see acldvpp Return Codes.

Constraints

The supported image resolution ranges from 6 x 4 to 4096 x 8192.