我試圖從CGImage創建CVPixelBufferRef所以這裏是方法:CGContextDrawImage崩潰
- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image
{
CGImageRetain(image);
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVPixelBufferCreate(kCFAllocatorDefault, CGImageGetWidth(image),
CGImageGetHeight(image), kCVPixelFormatType_32ARGB, (CFDictionaryRef) options,
&pxbuffer);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, CGImageGetWidth(image),
CGImageGetHeight(image), 8, 4*CGImageGetWidth(image), rgbColorSpace,
kCGImageAlphaNoneSkipFirst);
CGContextRetain(context);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
CGContextRelease(context);
CGImageRelease(image);
return pxbuffer;
}
我常常調用這個方法,它是用於生成視頻幀,25fps的。 能正常工作的大部分時間,但在某些時候它崩潰了這一行代碼:
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
I`ve測試的內存使用率和內存泄漏和接縫都很好,但暗戀STIL發生。
崩潰堆棧: 螺紋6崩潰:
0 ImageIO 0x39270806 CGImageReadGetBytesAtOffset + 34
1 ImageIO 0x392707d6 CGImageReadSessionGetBytes + 22
2 ImageIO 0x39280c3c fill_input_buffer + 148
3 ImageIO 0x3928003a read_markers + 154
4 ImageIO 0x3927fd82 consume_markers + 34
5 ImageIO 0x3927fbd2 _cg_jpeg_consume_input + 66
6 ImageIO 0x3927fb62 _cg_jpeg_read_header + 38
7 ImageIO 0x39292782 copyImageBlockSetJPEG + 2346
8 ImageIO 0x3928953e ImageProviderCopyImageBlockSetCallback + 510
9 CoreGraphics 0x38e0b9d6 CGImageProviderCopyImageBlockSetWithOptions + 158
10 CoreGraphics 0x38e0b66a img_blocks_create + 370
11 CoreGraphics 0x38e07a98 img_data_lock + 1488
12 CoreGraphics 0x38e06d2a CGSImageDataLock + 126
這樣的:[http://stackoverflow.com/questions/10774392/cgcontextdrawimage-crashes] [1] 嘗試保留pxdata [1]:http://stackoverflow.com/questions/10774392/cgcontextdrawimage-崩潰 – zengcity