IYUV to NV12 - 2024.1 English

Vitis Libraries

Release Date
2024-05-30
Version
2024.1 English

The iyuv2nv12 function converts single channel IYUV image to NV12 format. The inputs are separate U and V planes. There is no need of processing Y plane as both the formats have a same Y plane. U and V values are rearranged from plane interleaved to pixel interleaved.

API Syntax

template<int SRC_T, int UV_T, int ROWS, int COLS, int NPC =1, int NPC_UV=1, int XFCVDEPTH_IN_0 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_1 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_2 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_3 = _XFCVDEPTH_DEFAULT, int XFCVDEPTH_IN_4 = _XFCVDEPTH_DEFAULT>
void iyuv2nv12(xf::cv::Mat<SRC_T, ROWS, COLS, NPCXFCVDEPTH_IN_0> & src_y, xf::cv::Mat<SRC_T, ROWS/4, COLS, NPCXFCVDEPTH_IN_1> & src_u,xf::cv::Mat<SRC_T, ROWS/4, COLS, NPCXFCVDEPTH_IN_2> & src_v,xf::cv::Mat<SRC_T, ROWS, COLS, NPCXFCVDEPTH_IN_3> & _y_image, xf::cv::Mat<UV_T, ROWS/2, COLS/2, NPC_UVXFCVDEPTH_IN_4> & _uv_image)

Parameter Descriptions

The following table describes the template and the function parameters.

Table 395 Table iyuv2nv12 Parameter Description
Parameter Description
SRC_T Input pixel type. Only 8-bit, unsigned, 1-channel is supported (XF_8UC1).
UV_T Output pixel type. Only 8-bit, unsigned, 2-channel is supported (XF_8UC2).
ROWS Maximum height of input and output image.
COLS Maximum width of input and output image. Must be a multiple of 8 for 8 pixel mode.
NPC Number of pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC8 for 1 pixel and 8 pixel operations respectively.
NPC_UV Number of UV Pixels to be processed per cycle; possible options are XF_NPPC1 and XF_NPPC4 for 1 pixel and 4-pixel operations respectively.
XFCVDEPTH_IN_0 Depth of input image
XFCVDEPTH_IN_1 Depth of input image
XFCVDEPTH_IN_2 Depth of input image
XFCVDEPTH_IN_3 Depth of input image
XFCVDEPTH_IN_4 Depth of input image
src_y Input Y plane of size (ROWS, COLS).
src_u Input U plane of size (ROWS/4, COLS).
src_v Input V plane of size (ROWS/4, COLS).
_y_image Output V plane of size (ROWS, COLS).
_uv_image Output UV plane of size (ROWS/2, COLS/2).

Resource Utilization

The following table summarizes the resource utilization of IYUV to NV12 for different configurations, generated using Vivado HLS 2019.1 tool for the Xczu9eg-ffvb1156-1-i-es1 FPGA, to process a HD (1080x1920) image..

Table 396 Table iyuv2nv12 Function Resource Utilization Summary
Operating Mode Operating Frequency (MHz) Utilization Estimate
BRAM_18K DSP_48Es FF LUT CLB
1 Pixel 300 0 12 907 677 158
8 Pixel 150 0 12 1591 1022 235

Performance Estimate

The following table summarizes the performance of IYUV to NV12 for different configurations, as generated using the Vivado HLS 2019.1 version tool for the Xczu9eg-ffvb1156-1-i-es1, to process a grayscale HD (1080x1920) image.

Table 397 Table iyuv2nv12 Function Performance Estimate Summary
Operating Mode Latency Estimate
Max Latency (ms)
1 pixel operation (300 MHz) 6.9
8 pixel operation (150 MHz) 1.7