zuoyebang/tongxin/ThirdPartyLib/MessageDisplayKit/Classes/Factorys/XHVideoOutputSampleBufferFactory.m

//
//  XHVideoOutputSampleBufferFactory.m
//  MessageDisplayExample
//
//  Created by 曾 宪华 on 14-5-25.
//  Copyright (c) 2014年 曾宪华 开发团队(http://iyilunba.com ) 本人QQ:543413507 本人QQ群（142557668）. All rights reserved.
//

#import "XHVideoOutputSampleBufferFactory.h"

#import <UIKit/UIKit.h>

@implementation XHVideoOutputSampleBufferFactory

+ (UIImage *)imageFromSampleBuffer:(CMSampleBufferRef)sampleBuffer {
    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    // Lock the base address of the pixel buffer
    CVPixelBufferLockBaseAddress(imageBuffer,0);
    
    // Get the number of bytes per row for the pixel buffer
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
    // Get the pixel buffer width and height
    size_t width = CVPixelBufferGetWidth(imageBuffer);
    size_t height = CVPixelBufferGetHeight(imageBuffer);
    
    // Create a device-dependent RGB color space
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    if (!colorSpace) {
        NSLog(@"CGColorSpaceCreateDeviceRGB failure");
        return nil;
    }
    
    // Get the base address of the pixel buffer
    void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
    // Get the data size for contiguous planes of the pixel buffer.
    size_t bufferSize = CVPixelBufferGetDataSize(imageBuffer);
    
    // Create a Quartz direct-access data provider that uses data we supply
    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, bufferSize,
                                                              NULL);
    // Create a bitmap image from data supplied by our data provider
    CGImageRef cgImage =
    CGImageCreate(width,
                  height,
                  8,
                  32,
                  bytesPerRow,
                  colorSpace,
                  kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little,
                  provider,
                  NULL,
                  true,
                  kCGRenderingIntentDefault);
    CGDataProviderRelease(provider);
    CGColorSpaceRelease(colorSpace);
    
    // Create and return an image object representing the specified Quartz image
    UIImage *image = [UIImage imageWithCGImage:cgImage];
    CGImageRelease(cgImage);
    
    CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
    
    return image;
}

@end