t**********y
发帖数: 374 | 1 多谢了！！！
====
#import "VideoFrame.h"
#import "opencv2/opencv.hpp"
static void YpCbCr422toBGRA8(uint8_t *src, uint8_t *dest, uint32_t width,
uint32_t height);
@implementation VideoFrame
@synthesize image = _image;
@synthesize presentationTime = _presentationTime;
- (id)initWithIplImageTakingOwnership:(IplImage *)image presentationTime:(
NSTimeInterval)presentationTime
{
if ((self = [super init])) {
NSAssert(image, @"image is required");
_image = image;
_presentationTime = presentationTime;
}
return self;
}
- (void)dealloc
{
cvReleaseImage(&_image);
}
- (id)copyWithZone:(NSZone *)zone
{
return [[[self class] alloc] initWithIplImageTakingOwnership:cvCloneImage(_
image) presentationTime:_presentationTime];
}
- (id)initByCopyingCVPixelBuffer:(CVPixelBufferRef)cvPixelBuffer naturalSize
:(NSSize)naturalSize presentationTime:(NSTimeInterval)presentationTime
{
CVPixelBufferLockBaseAddress(cvPixelBuffer, kCVPixelBufferLock_ReadOnly);
OSType formatType = CVPixelBufferGetPixelFormatType(cvPixelBuffer);
void *baseAddress = CVPixelBufferGetBaseAddress(cvPixelBuffer);
size_t width = CVPixelBufferGetWidth(cvPixelBuffer);
size_t height = CVPixelBufferGetHeight(cvPixelBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(cvPixelBuffer);
IplImage *iplImage = NULL;
if (formatType == kCVPixelFormatType_422YpCbCr8) {
iplImage = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 4); // BGRA
YpCbCr422toBGRA8((uint8_t *)baseAddress, (uint8_t *)iplImage->imageData,
width, height);
} else if (formatType == kCVPixelFormatType_32BGRA) {
// Create a header to hold the source image
IplImage *iplImageHeader = cvCreateImageHeader(cvSize(width, height), IPL_
DEPTH_8U, 4);
iplImageHeader->widthStep = bytesPerRow;
iplImageHeader->imageSize = bytesPerRow * height;
iplImageHeader->imageData = iplImageHeader->imageDataOrigin = (char *)
baseAddress;
iplImage = cvCloneImage(iplImageHeader);
cvReleaseImageHeader(&iplImageHeader);
}
NSAssert(iplImage, @"invalid format");
CVPixelBufferUnlockBaseAddress(cvPixelBuffer, kCVPixelBufferLock_ReadOnly);
// Rescale the image if necessary
if (naturalSize.width > 0 && (width != (size_t)naturalSize.width || height !
= (size_t)naturalSize.height)) {
IplImage *resizedImage = cvCreateImage(cvSize(naturalSize.width, naturalSize
.height), iplImage->depth, iplImage->nChannels);
cvResize(iplImage, resizedImage, CV_INTER_AREA);
cvReleaseImage(&iplImage);
iplImage = resizedImage;
}
return [self initWithIplImageTakingOwnership:iplImage presentationTime:
presentationTime];
}
@end
// cb and cr are - 128 here
#define YpCbCr2RGB(y, cb, cr, r, g, b)
r = y + ((cr * 1404) >> 10);
g = y - ((cr * 715 + cb * 344) >> 10);
b = y + ((cb * 1774) >> 10);
r = r < 0 ? 0 : r;
g = g < 0 ? 0 : g;
b = b < 0 ? 0 : b;
r = r > 255 ? 255 : r;
g = g > 255 ? 255 : g;
b = b > 255 ? 255 : b
static void YpCbCr422toBGRA8(uint8_t *src, uint8_t *dest, uint32_t width,
uint32_t height) {
// Byte order UYVY
int j = 0, i = 0;
const int srcMax = (width * height) * 2;
while (i < srcMax) {
int cb = (uint8_t)src[i++] - 128;
int y0 = (uint8_t)src[i++];
int cr = (uint8_t)src[i++] - 128;
int y1 = (uint8_t)src[i++];
int r, g, b;
YpCbCr2RGB(y1, cb, cr, r, g, b);
dest[j++] = b;
dest[j++] = g;
dest[j++] = r;
dest[j++] = 255; // a
YpCbCr2RGB(y0, cb, cr, r, g, b);
dest[j++] = b;
dest[j++] = g;
dest[j++] = r;
dest[j++] = 255; // a
}
} | r**m
发帖数: 1825 | | y*******g
发帖数: 6599 | 3 objective-c, 居然还有@synthesize image = _image; ，，，有些年头了 | t**********y
发帖数: 374 | 4 多谢了！
【在 r**m 的大作中提到】
: object C
| c*********e
发帖数: 16335 | 5 objective-c,写iphone app时用的语言，xcode作为ide.
NSAssert,难道是做调试test用的？
【在 t**********y 的大作中提到】
: 多谢了！！！
: ====
: #import "VideoFrame.h"
: #import "opencv2/opencv.hpp"
: static void YpCbCr422toBGRA8(uint8_t *src, uint8_t *dest, uint32_t width,
: uint32_t height);
: @implementation VideoFrame
: @synthesize image = _image;
: @synthesize presentationTime = _presentationTime;
: - (id)initWithIplImageTakingOwnership:(IplImage *)image presentationTime:(
|
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