YCbCr422ToBGR
Converts a YCbCr image in 4:2:2 sampling format to a BGR image. 4:2:2 YCbCr sampling indicates that Y is sampled twice, and Cb and Cr are sampled once for every two pixel blocks.
This function converts the color according to the following formulas:
The function interface declaration is as follows:
- Operation on pixel-order data:
HmppResult HMPPI_YCbCr422ToBGR_8u_C2C3R(const uint8_t* src, int32_t srcStep, uint8_t *dst, int32_t dstStep, HmppiSize roiSize)
HmppResult HMPPI_YCbCr422ToBGR_8u_C2C4R(const uint8_t* src, int32_t srcStep, uint8_t *dst, int32_t dstStep, HmppiSize roiSize, uint8_t aVal)
- Conversion from planar data to pixel-order data:
HmppResult HMPPI_YCbCr422ToBGR_8u_P3C3R(const uint8_t* src[0x3], int32_t srcStep[0x3], uint8_t *dst, int32_t dstStep, HmppiSize roiSize)
Parameters
Parameter |
Description |
Value Range |
Input/Output |
|---|---|---|---|
src |
Pointer to the source image. This array stores the color data of the source planar image. |
The value cannot be NULL. |
Input |
srcStep |
Distance between starts of consecutive lines in the source image, in bytes |
The value must be zero or a positive integer. |
Input |
dst |
Pointer to the destination image ROI. This array stores the color data of the destination planar image. |
The value cannot be NULL. |
Output |
dstStep |
Distance between starts of consecutive lines in the destination image, in bytes |
The value must be zero or a positive integer. |
Input |
roiSize |
Size of the ROI of the source and destination images, in pixels |
roiSize.width ∈ (2, INT_MAX], roiSize.height ∈ (0, INT_MAX] |
Input |
aVal |
Constant value used to fill the fourth channel |
The value must be zero or a positive integer. |
Input |
Return Value
- Success: HMPP_STS_NO_ERR
- Failure: An error code is returned.
Error Codes
Error Code |
Description |
|---|---|
HMPP_STS_NULL_PTR_ERR |
The value of src or dst is NULL. |
HMPP_STS_SIZE_ERR |
The value of roiSize is zero or negative, or the value of roiSize.width is less than 2. |
HMPP_STS_STEP_ERR |
The value of srcStep or dstStep is 0 or negative. |
HMPP_STS_ROI_ERR |
roiSize.width x Number of channels x Number of bytes occupied by the data type > Step |
HMPP_STS_NO_ERR |
No error occurs. |
Example
#define SRC_BUFFER_SIZE_T 48
#define DST_BUFFER_SIZE_T 60
void TestExample()
{
HmppiSize roi = { 4, 4 };
const uint8_t srcY[SRC_BUFFER_SIZE_T] = {
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66,
55, 44, 33, 11, 22, 33, 44, 55, 66, 77, 88, 22,
88, 77, 66, 55, 44, 33, 11, 22, 33, 44, 55, 66,
77, 88, 22, 88, 77, 66, 55, 44, 33, 11, 22, 33
};
const uint8_t srcCb[SRC_BUFFER_SIZE_T] = {
177, 188, 122, 188, 177, 166, 155, 144,
155, 144, 133, 111, 122, 133, 144, 155,
188, 177, 166, 155, 144, 133, 111, 122,
111, 122, 133, 144, 155, 166, 177, 188
};
const uint8_t srcCr[SRC_BUFFER_SIZE_T] = {
255, 244, 233, 111, 212, 233, 244, 255,
188, 177, 166, 255, 144, 233, 121, 122,
177, 188, 222, 188, 177, 166, 155, 144,
211, 222, 233, 244, 155, 166, 177, 188
};
const uint8_t *src[3] = {srcY, srcCb, srcCr};
int32_t srcStep[3] = {12, 8, 8};
uint8_t dst[DST_BUFFER_SIZE_T] = { 0 };
int32_t dstStep = 12 * sizeof(uint8_t);
HmppResult result = HMPPI_YCbCr422ToBGR_8u_P3C3R(src, srcStep, dst, dstStep, roi);
printf("result = %d \ndst = ", result);
if (result != HMPP_STS_NO_ERR) {
printf("result error: %d\n", result);
}
int32_t dstWidth = dstStep / sizeof(uint8_t);
for (int32_t i = 0; i < DST_BUFFER_SIZE_T; i++) {
if( i % dstWidth == 0 ){
printf("\n");
}
printf("%3d ",dst[i]);
}
printf("\n");
}
int main()
{
TestExample();
return 0;
}
Output:
result = 0 dst = 93 0 196 105 0 209 140 0 204 153 0 217 99 0 141 87 0 128 52 0 97 26 0 72 204 20 162 192 7 149 157 0 153 144 0 141 36 10 203 49 22 216 0 0 157 71 9 233 0 0 0 0 0 0 0 0 0 0 0 0