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@Xiaojun-Jin 2015-03-30T02:10:33.000000Z 字数 13560 阅读 2659

ArcSoft常用图片格式和UIImage的转换

iOS UIImage

  1. typedef struct __tag_MBITMAP
  2. {
  3.     MDWord  dwPixelArrayFormat;
  4.     MLong   lWidth;
  5.     MLong   lHeight;
  6.     MLong   lPitch[MPAF_MAX_PLANES];
  7.     MByte   *pPlane[MPAF_MAX_PLANES];
  8. }MBITMAP, *LPMBITMAP;

初始化32位的空MBITMAP:

  1. + (MBITMAP *)mallocEmptyMBitmap32WithWidth:(MLong)lWidth height:(MLong)lHeight
  2. {
  3.     MBITMAP *pBitmapData = (MBITMAP *)malloc(sizeof(MBITMAP));
  5.     if (!pBitmapData) return nil;
  7.     memset(pBitmapData, 0, sizeof(MBITMAP));
  8.     pBitmapData->dwPixelArrayFormat = DISPLAY32PIXEL;
  9.     pBitmapData->lWidth    = lWidth;
  10.     pBitmapData->lHeight   = lHeight;
  11.     pBitmapData->lPitch[0] = LINE_BYTES(pBitmapData->lWidth, 32);
  12.     pBitmapData->pPlane[0] = (MByte *)malloc(pBitmapData->lPitch[0] * pBitmapData->lHeight);
  14.     if (pBitmapData->pPlane[0]  == nil) 
  15.     {
  16.         free(pBitmapData); pBitmapData = nil;
  17.     }
  19.     return pBitmapData;
  20. }

UIImage 转32位 MBITMAP:

  1. + (MRESULT)convertUIImage:(UIImage *)image toMBitmap:(MBITMAP *)pBitmap
  2. {
  3.     MRESULT res = MOK; if(!image || !pBitmap) return MERR_INVALID_PARAM;
  5.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  6.     CGImageRef          imgRef = [image CGImage];
  8.     if (CGImageGetWidth(imgRef)  != pBitmap->lWidth ||
  9.         CGImageGetHeight(imgRef) != pBitmap->lHeight)
  10.     {
  11.         CGColorSpaceRelease(colorSpace);
  12.         return MERR_INVALID_PARAM;
  13.     }
  15.     CGContextRef context = CGBitmapContextCreate(pBitmap->pPlane[0], 
  16.                                                  pBitmap->lWidth, 
  17.                                                  pBitmap->lHeight, 
  18.                                                  8, 
  19.                                                  pBitmap->lPitch[0], 
  20.                                                  colorSpace,            
  21.                                                  kCGImageAlphaPremultipliedLast |
  22.                                                  kCGBitmapByteOrder32Big);
  23.     CGColorSpaceRelease(colorSpace);
  25.     colorSpace = nil; if (!context) return MERR_UNKNOWN;
  27.     CGRect rect = {{0,0}, {pBitmap->lWidth, pBitmap->lHeight}};
  28.     CGContextDrawImage(context, rect, imgRef);
  29.     CGContextRelease(context); context = nil;
  31.     return res;
  32. }

32位MBITMAP 转 UIImage:

  1. + (UIImage *)convertMBitmap32:(MBITMAP *)bitmap 
  2.               withOrientation:(UIImageOrientation)orientation
  3. {
  4.     CGFloat width = bitmap->lWidth; CGFloat height = bitmap->lHeight;
  5.     unsigned char *buffer = bitmap->pPlane[0];
  6.     size_t bufferLength   = width * height * 4;
  8.     CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer, bufferLength, NULL);
  9.     size_t bitsPerComponent    = 8;
  10.     size_t bitsPerPixel        = 32;
  11.     size_t bytesPerRow         = 4 * width;
  13.     CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
  14.     if(colorSpaceRef == NULL) 
  15.     {
  16.         CGDataProviderRelease(provider); return nil;
  17.     }
  19.     CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
  20.     CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
  22.     CGImageRef iref = CGImageCreate(width,
  23.                                     height,
  24.                                     bitsPerComponent,
  25.                                     bitsPerPixel,
  26.                                     bytesPerRow,
  27.                                     colorSpaceRef,
  28.                                     bitmapInfo,
  29.                                     provider,   
  30.                                     NULL,       
  31.                                     YES,            
  32.                                     renderingIntent);
  34.     uint32_t* pixels = (uint32_t*)malloc(bufferLength);
  36.     if(pixels == NULL) 
  37.     {
  38.         CGDataProviderRelease(provider);
  39.         CGColorSpaceRelease(colorSpaceRef);
  40.         CGImageRelease(iref); return nil;
  41.     }
  43.     CGContextRef context = CGBitmapContextCreate(pixels,
  44.                                                  width,
  45.                                                  height,
  46.                                                  bitsPerComponent,
  47.                                                  bytesPerRow,
  48.                                                  colorSpaceRef,
  49.                                                  kCGImageAlphaPremultipliedLast | 
  50.                                                  kCGBitmapByteOrder32Big);
  52.     if(context == NULL) 
  53.     {
  54.         NSLog(@"Error context not created"); // free(pixels);
  55.     }
  57.     UIImage *image = nil;
  59.     if(context) 
  60.     {
  61.         CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, width, height), iref);
  62.         CGImageRef imageRef = CGBitmapContextCreateImage(context);
  64.         // Support both iPad 3.2 and iPhone 4 Retina displays with the correct scale
  65.         if([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) 
  66.         {
  67.             image = [UIImage imageWithCGImage:imageRef 
  68.                                         scale:1.f 
  69.                                   orientation:UIImageOrientationUp];
  70.         }
  71.         else
  72.         {
  73.             image = [UIImage imageWithCGImage:imageRef];
  74.         }
  76.         CGImageRelease(imageRef); CGContextRelease(context);
  77.     }
  79.     CGColorSpaceRelease(colorSpaceRef);
  80.     CGImageRelease(iref);
  81.     CGDataProviderRelease(provider);
  83.     if(pixels) free(pixels); return image;
  84. }

释放MBITMAP:

  1. + (void)releaseBitmap:(MBITMAP *)bitmap
  2. {
  3.     if (bitmap)
  4.     {
  5.         if (bitmap->pPlane[0]) 
  6.         {
  7.             free(bitmap->pPlane[0]);
  8.             bitmap->pPlane[0] = nil;
  9.             free(bitmap); 
  10.             bitmap = nil;
  11.         }
  12.     }
  13. }

UIImage 转24位 MBITMAP:

  2. - (unsigned char *)bitmap24FromUIImage:(UIImage *)image
  3. {
  4.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  6.     if (colorSpace == NULL) return NULL;
  8.     void *bitmapData = malloc(image.size.width * image.size.height * 4);
  10.     if (bitmapData == NULL)
  11.     {
  12.         CGColorSpaceRelease(colorSpace); return NULL;
  13.     }
  15.     CGContextRef context = CGBitmapContextCreate (bitmapData, 
  16.                                                   image.size.width, 
  17.                                                   image.size.height, 
  18.                                                   8, 
  19.                                                   image.size.width * 4,
  20.                                                   colorSpace, 
  21.                                                   kCGImageAlphaPremultipliedFirst);
  22.     CGColorSpaceRelease(colorSpace );
  24.     if (context == NULL)
  25.     {
  26.         free (bitmapData); return NULL;
  27.     }
  29.     CGRect rect = CGRectMake(0.0f, 0.0f, image.size.width, image.size.height);
  30.     CGContextDrawImage(context, rect, image.CGImage);
  32.     unsigned char *data = CGBitmapContextGetData (context);
  33.     CGContextRelease(context);
  35.     long lWidth = image.size.width; long lHeight = image.size.height;
  37.     unsigned char *pRstData = MNull; pRstData = malloc(lWidth * lHeight * 3);
  39.     for (int j=0; j<lHeight; j++)
  40.     {
  41.         for (int i=0; i<lWidth; i++)
  42.         {
  43.             *(pRstData + j*3*lWidth+i*3)   = *(data + j*4*lWidth+i*4+3);
  44.             *(pRstData + j*3*lWidth+i*3+1) = *(data + j*4*lWidth+i*4+2);
  45.             *(pRstData + j*3*lWidth+i*3+2) = *(data + j*4*lWidth+i*4+1);
  46.         }
  47.     }
  49.     if (data) { free(data); data = NULL; }
  51.     return pRstData;
  52. }

转换示例代码:

  1. // create
  2. MBITMAP offImageOri = {0};
  4. unsigned char *pImgData = [self bitmap24FromUIImage:newImage];
  5. long lWidth = newImage.size.width; long lHeight = newImage.size.height;
  7. offImageOri.dwPixelArrayFormat    = MPAF_RGB24_B8G8R8;
  8. offImageOri.lWidth                = lWidth;
  9. offImageOri.lHeight               = lHeight;
  10. offImageOri.lPitch[0]             = lWidth*3;
  11. offImageOri.pPlane[0]             = pImgData;
  13. // release
  14. if (offImageOri.pPlane[0]) free(offImageOri.pPlane[0]);

24位 MBITMAP 转 UIImage:

  1. - (UIImage *)createUIImageFrom24MBitmap:(MBITMAP)offImageRst
  2. {
  3.     unsigned char *pRstData = NULL; pRstData = malloc(lWidth * lHeight * 4);
  5.     for (int j=0; j<lHeight; j++)
  6.     {
  7.         for (int i=0; i<lWidth; i++)
  8.         {
  9.             *(pRstData + j*4*lWidth+i*4)    = 255;
  10.             *(pRstData + j*4*lWidth+i*4+1)  = *(offImageRst.pPlane[0] + j*3*lWidth+i*3+2);
  11.             *(pRstData + j*4*lWidth+i*4+2)  = *(offImageRst.pPlane[0] + j*3*lWidth+i*3+1);
  12.             *(pRstData + j*4*lWidth+i*4+3)  = *(offImageRst.pPlane[0] + j*3*lWidth+i*3+0);
  13.         }
  14.     }
  16.     UIImage *resultImage = [self imageWithBits:pRstData 
  17.                                       withSize:CGSizeMake(offImageRst.lWidth, 
  18.                                                           offImageRst.lHeight)];
  19.     return resultImage;
  20. }
  22. - (UIImage *)imageWithBits:(unsigned char *)bits withSize:(CGSize)size
  23. {
  24.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  26.     if (colorSpace == NULL) free(bits); return nil;
  28.     CGContextRef context = CGBitmapContextCreate (bits, 
  29.                                                   size.width, 
  30.                                                   size.height, 
  31.                                                   8, 
  32.                                                   size.width * 4, 
  33.                                                   colorSpace, 
  34.                                                   kCGImageAlphaPremultipliedFirst);
  36.     if (context == NULL)
  37.     {
  38.         free (bits); CGColorSpaceRelease(colorSpace ); return nil;
  39.     }
  41.     CGColorSpaceRelease(colorSpace );
  42.     CGImageRef ref = CGBitmapContextCreateImage(context);
  44.     free(CGBitmapContextGetData(context));
  45.     CGContextRelease(context);
  47.     UIImage *img = [UIImage imageWithCGImage:ref];
  49.     CFRelease(ref); return img;
  50. }
  1. typedef struct __tag_ASVL_OFFSCREEN
  2. {
  3.     MUInt32 u32PixelArrayFormat;
  4.     MInt32  i32Width;
  5.     MInt32  i32Height;
  6.     MUInt8* ppu8Plane[4];
  7.     MInt32  pi32Pitch[4];
  8. }ASVLOFFSCREEN, *LPASVLOFFSCREEN;

UIImage 转 ASVL_OFFSCREEN (RGB):

  1. - (unsigned char *)createASVLImageFromUIImage:(UIImage *)image
  2. {
  3.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  5.     if (colorSpace == NULL) return NULL;
  7.     void *bitmapData = malloc(image.size.width * image.size.height * 4);
  9.     if (bitmapData == NULL)
  10.     {
  11.         CGColorSpaceRelease(colorSpace); return NULL;
  12.     }
  14.     CGContextRef context = CGBitmapContextCreate (bitmapData, 
  15.                                                   image.size.width, 
  16.                                                   image.size.height, 
  17.                                                   8, 
  18.                                                   image.size.width * 4,
  19.                                                   colorSpace, 
  20.                                                   kCGImageAlphaPremultipliedFirst);
  21.     CGColorSpaceRelease(colorSpace );
  23.     if (context == NULL)
  24.     {
  25.         free (bitmapData); return NULL;
  26.     }
  28.     CGRect rect = CGRectMake(0.0f, 0.0f, image.size.width, image.size.height);
  29.     CGContextDrawImage(context, rect, image.CGImage);
  31.     unsigned char *data = CGBitmapContextGetData (context);
  32.     CGContextRelease(context); return data;
  33. }

转换示例代码:

  1. unsigned char *pImgData = [self createASVLImageFromUIImage:newImage];
  2. long lWidth = newImage.size.width; long lHeight = newImage.size.height;
  4. ASVLOFFSCREEN m_offscreenOri;
  6. m_offscreenOri.u32PixelArrayFormat  = ASVL_PAF_RGB32_A8R8G8B8;
  7. m_offscreenOri.i32Width             = lWidth;
  8. m_offscreenOri.i32Height            = lHeight;
  9. m_offscreenOri.pi32Pitch[0]         = lWidth*4;
  10. m_offscreenOri.ppu8Plane[0]         = pImgData;

ASVL_OFFSCREEN (YUV) 转 UIImage:

  1. - (UIImage *)convertASVLImageToUIImage:(ASVLOFFSCREEN *)pImg
  2. {
  3.     CVPixelBufferRef pBuffer;
  5.     int bufferWidth  = pImg->i32Width;
  6.     int bufferHeight = pImg->i32Height;
  8.     OSType pixelFormatType = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
  9.     NSDictionary *mAttrs   = [NSDictionary dictionaryWithObject:[NSDictionary dictionary]
  10.                                                 forKey:(id)kCVPixelBufferIOSurfacePropertiesKey];
  12.     CVPixelBufferCreate(kCFAllocatorDefault, 
  13.                         bufferWidth, 
  14.                         bufferHeight, 
  15.                         pixelFormatType,
  16.                         (CFDictionaryRef)mAttrs, 
  17.                         &pBuffer);
  19.     CVPixelBufferLockBaseAddress(pBuffer,0);
  21.     UInt8  *pPlanY    = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(pBuffer, 0);
  22.     UInt8  *pPlanUV   = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(pBuffer, 1);
  23.     // Taking 4 bytes alignment into consideration, do not use bufferWdith drectly
  24.     size_t rowBytesY  = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0); 
  25.     size_t rowBytesUV = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 1); 
  27.     for (int i = 0; i < pImg->i32Height; ++i)
  28.     {
  29.         memcpy(pPlanY  + i*rowBytesY, pImg->ppu8Plane[0]+ i*pImg->pi32Pitch[0], pImg->i32Width);
  30.     }
  31.     for (int i = 0; i < pImg->i32Height/2; ++i)
  32.     {
  33.         memcpy(pPlanUV + i*rowBytesUV, pImg->ppu8Plane[1]+i*pImg->pi32Pitch[1], pImg->i32Width);
  34.     }
  36.     CVPixelBufferUnlockBaseAddress(pBuffer,0);
  38.     CIImage   *ciImage = [CIImage imageWithCVPixelBuffer:pBuffer];
  39.     CIContext *context = [CIContext contextWithOptions:nil];
  41.     CGImageRef myImage = [context createCGImage:ciImage
  42.                                        fromRect:CGRectMake(0, 0,
  43.                                                            CVPixelBufferGetWidth(pBuffer),
  44.                                                            CVPixelBufferGetHeight(pBuffer))];
  45.     UIImage *nImage = [UIImage imageWithCGImage:myImage];
  46.     CGImageRelease(myImage); CVPixelBufferRelease(pBuffer);
  48.     return nImage;
  49. }

CIContext 对渲染图片的大小有限制, 可以用inputImageMaximumSize和outputImageMaximumSize查看最大值(4096*4096)

CVPixelBuffer 转 ASVL_OFFSCREEN (YUV):

  1. - (void)createASVLImageFromCVPixelBufferRef:(CVPixelBufferRef)pixelBuffer
  2. {
  3.     int     width      = CVPixelBufferGetWidth(pixelBuffer);
  4.     int     height     = CVPixelBufferGetHeight(pixelBuffer);
  5.     UInt8   *pPlanY    = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0);
  6.     size_t  nPlanYRow  = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0);
  7.     UInt8   *pPlanUV   = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1);
  8.     size_t  nPlanUVRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 1);
  10.     MRESULT eResult = MOK; ASVLOFFSCREEN fullSrcImage;
  12.     memset(&fullSrcImage, 0, sizeof(ASVLOFFSCREEN));
  14.     fullSrcImage.i32Width              =width;
  15.     fullSrcImage.i32Height             =height;
  16.     fullSrcImage.u32PixelArrayFormat   =ASVL_PAF_NV12;
  17.     fullSrcImage.pi32Pitch[0]          =nPlanYRow;
  18.     fullSrcImage.ppu8Plane[0]          =pPlanY;
  19.     fullSrcImage.pi32Pitch[1]          =nPlanUVRow;
  20.     fullSrcImage.ppu8Plane[1]          =pPlanUV;
  21. }

ASVL_OFFSCREEN (YUV) 转 UIImage (RGB):

  1. - (UIImage *)imageFromASVLImage:(ASVLOFFSCREEN *)pImg
  2. {
  3.     uint8_t *rgbBuffer  = malloc(pImg->i32Height * pImg->i32Width * 4);
  4.     uint8_t *yBuffer    = pImg->ppu8Plane[0];
  5.     uint8_t *cbCrBuffer = pImg->ppu8Plane[1];
  7.     for(int y = 0; y < pImg->i32Height; y++)
  8.     {
  9.         uint8_t *rgbBufferLine  = &rgbBuffer[y * pImg->i32Width * 4];
  10.         uint8_t *yBufferLine    = &yBuffer[y * pImg->pi32Pitch[0]];
  11.         uint8_t *cbCrBufferLine = &cbCrBuffer[(y >> 1) * pImg->pi32Pitch[1]];
  13.         for(int x = 0; x < pImg->i32Width; x++)
  14.         {
  15.             uint8_t y           = yBufferLine[x];
  16.             uint8_t cb          = cbCrBufferLine[x & ~1];
  17.             uint8_t cr          = cbCrBufferLine[x | 1];
  18.             uint8_t *rgbOutput  = &rgbBufferLine[x*4];
  20.             int r, g, b;
  22.             r = y + 1.4075 *(cr-128);
  23.             g = y - 0.3455 *(cb -128)-0.7169 *(cr-128);
  24.             b = y + 1.779  *(cb - 128);
  26.             r = r<0?0:r; r = r>255?255:r;
  27.             g = g<0?0:g; g = g>255?255:g;
  28.             b = b<0?0:b; b = b>255?255:b;
  30.             rgbOutput[0] = r;
  31.             rgbOutput[1] = g;
  32.             rgbOutput[2] = b;
  33.             rgbOutput[3] = 255;
  34.         }
  35.     }
  37.     // Create a device-dependent RGB color space
  38.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  40.     if (!colorSpace) NSLog(@"CGColorSpaceCreateDeviceRGB failure");
  42.     CGContextRef context = CGBitmapContextCreate(rgbBuffer, 
  43.                                                  pImg->i32Width, 
  44.                                                  pImg->i32Height, 
  45.                                                  8, 
  46.                                                  pImg->i32Width*4, 
  47.                                                  colorSpace, 
  48.                                                  kCGBitmapByteOrder32Big |
  49.                                                  kCGImageAlphaPremultipliedLast);
  51.     CGImageRef cgiMage = CGBitmapContextCreateImage(context);
  53.     CGColorSpaceRelease(colorSpace); free(rgbBuffer); CGContextRelease(context);
  55.     UIImage *img = [UIImage imageWithCGImage:cgiMage];
  57.     CFRelease(cgiMage); return img;
  58. }

CVPixelBuffer 转 UIImage:

  1. - (UIImage *)imageFromCMSampleBuffer:(CMSampleBufferRef)sampleBufferRef
  2. {
  3.     CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBufferRef);
  5.     CIImage   *ciImage = [CIImage imageWithCVPixelBuffer:pixelBuffer];
  6.     CIContext *context = [CIContext contextWithOptions:nil];
  7.     CGImageRef myImage = [context createCGImage:ciImage
  8.                                        fromRect:CGRectMake(0, 0,
  9.                                                            CVPixelBufferGetWidth(pixelBuffer),
  10.                                                            CVPixelBufferGetHeight(pixelBuffer))];
  11.     UIImage *uiImage = [UIImage imageWithCGImage:myImage];
  13.     return uiImage;
  14. }

Resize SampleBuffer:

  1. void resizeSampleBuffer(CVPixelBufferRef cameraFrame, 
  2.                         CGSize finalSize,
  3.                         CMSampleBufferRef *sampleBuffer)
  4. {
  5.     // CVPixelBufferCreateWithPlanarBytes for YUV input
  6.     CGSize originalSize = CGSizeMake(CVPixelBufferGetWidth(cameraFrame), 
  7.                                      CVPixelBufferGetHeight(cameraFrame));
  9.     CVPixelBufferLockBaseAddress(cameraFrame, 0);
  10.     GLubyte *sourceImageBytes = CVPixelBufferGetBaseAddress(cameraFrame);
  12.     CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, sourceImageBytes, 
  13.                       CVPixelBufferGetBytesPerRow(cameraFrame) * originalSize.height, NULL);
  15.     CGColorSpaceRef genericRGBColorspace = CGColorSpaceCreateDeviceRGB();
  16.     CGImageRef cgImageFromBytes = CGImageCreate((int)originalSize.width,
  17.                                                 (int)originalSize.height, 
  18.                                                 8, 
  19.                                                 32, 
  20.                                                 CVPixelBufferGetBytesPerRow(cameraFrame), 
  21.                                                 genericRGBColorspace, 
  22.                                                 kCGBitmapByteOrder32Little |
  23.                                                 kCGImageAlphaPremultipliedFirst, 
  24.                                                 dataProvider, 
  25.                                                 NULL, 
  26.                                                 NO, 
  27.                                                 kCGRenderingIntentDefault);
  29.     GLubyte *imageData = (GLubyte *) calloc(1, (int)finalSize.width * (int)finalSize.height * 4);
  31.     CGContextRef imageContext = CGBitmapContextCreate(imageData, 
  32.                                                       (int)finalSize.width, 
  33.                                                       (int)finalSize.height, 
  34.                                                       8, 
  35.                                                       (int)finalSize.width * 4, 
  36.                                                       genericRGBColorspace,  
  37.                                                       kCGBitmapByteOrder32Little | 
  38.                                                       kCGImageAlphaPremultipliedFirst);
  40.     CGContextDrawImage(imageContext, 
  41.                        CGRectMake(0.0, 0.0, finalSize.width, finalSize.height), 
  42.                        cgImageFromBytes);
  44.     CGImageRelease(cgImageFromBytes);
  45.     CGContextRelease(imageContext);
  46.     CGColorSpaceRelease(genericRGBColorspace);
  47.     CGDataProviderRelease(dataProvider);
  49.     CVPixelBufferRef pixel_buffer = NULL;
  50.     CVPixelBufferCreateWithBytes(kCFAllocatorDefault, 
  51.                                  finalSize.width, 
  52.                                  finalSize.height, 
  53.                                  kCVPixelFormatType_32BGRA, 
  54.                                  imageData, 
  55.                                  finalSize.width * 4, 
  56.                                  stillImageDataReleaseCallback, NULL, NULL, &pixel_buffer);
  58.     CMVideoFormatDescriptionRef videoInfo = NULL;
  59.     CMVideoFormatDescriptionCreateForImageBuffer(NULL, pixel_buffer, &videoInfo);
  61.     CMTime frameTime = CMTimeMake(1, 30);
  62.     CMSampleTimingInfo timing = {frameTime, frameTime, kCMTimeInvalid};
  64.     CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault,
  65.                                        pixel_buffer, 
  66.                                        YES, 
  67.                                        NULL, 
  68.                                        NULL, 
  69.                                        videoInfo, 
  70.                                        &timing, 
  71.                                        sampleBuffer);
  73.     CVPixelBufferUnlockBaseAddress(cameraFrame, 0);
  74.     CFRelease(videoInfo);
  75.     CVPixelBufferRelease(pixel_buffer);
  76. }
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