我要实现把(CVPixelBufferRef)pixel_buffer摄像头采集的数据，通过_rawDataInputFilter _rawDataOutputFilter加入到filter链， 再把数据传回来，实现接入第三方的filter。
init初始化
self.Process = [[ProcessPixelBuffer alloc]init];
转化接口：
CVPixelBufferRef output = NULL;
[self.Process processWithCVPixelBuffer:pixel_buffer];
output = pixel_buffer; //output转化后输出的数据
转化工具processWithCVPixelBuffer代码：
processWithCVPixelBuffer.m
#import "ProcessPixelBuffer.h"
#import "YFGPUImageCameraBeautyFilters.h"
@interface ProcessPixelBuffer (){
GPUImageFilter *_beautityFilter;
GPUImageRawDataInput *_rawDataInputFilter;
CVPixelBufferRef imageBuffer;
}
@property (nonatomic, strong) dispatch_semaphore_t semaphore;
@end
@implementation ProcessPixelBuffer
- (instancetype)init
{
self = [super init];
if (self) {
_semaphore = dispatch_semaphore_create(0);
_rawDataInputFilter = [[GPUImageRawDataInput alloc] initWithBytes:nil size:CGSizeMake(0, 0)];
_beautityFilter = [[GPUImageFilter alloc] initWithFragmentShaderFromString:kGPUImageBeautifyFragmentShaderString_Level_5];
__weak typeof(self) ws = self;
[_beautityFilter setFrameProcessingCompletionBlock:^(GPUImageOutput *output, CMTime time) {
GPUImageFramebuffer *imageFramebuffer = output.framebufferForOutput;
glFinish();
imageBuffer = [imageFramebuffer getRenderTarget];
dispatch_semaphore_signal(ws.semaphore);
}];
[_rawDataInputFilter addTarget:_beautityFilter];
}
return self;
}
- (void)processWithCVPixelBuffer:(CVPixelBufferRef)pixelBuffer{
CVPixelBufferLockBaseAddress(pixelBuffer, 0);
//从 CVImageBufferRef 取得影像的细部信息
uint8_t *base;
size_t width, height, bytesPerRow, size;
base = CVPixelBufferGetBaseAddress(pixelBuffer);
width = CVPixelBufferGetWidth(pixelBuffer);
height = CVPixelBufferGetHeight(pixelBuffer);
bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer);
[_rawDataInputFilter updateDataFromBytes:base size:CGSizeMake(bytesPerRow/4, height)];
[_rawDataInputFilter processData];
dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER);
CVPixelBufferLockBaseAddress(imageBuffer, 0);
uint8_t *data = CVPixelBufferGetBaseAddress(imageBuffer);
size = CVPixelBufferGetDataSize(imageBuffer);
memcpy(base,data,size);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
}
-(void)dealloc{
[_beautityFilter removeAllTargets];
}
@end
processWithCVPixelBuffer.h
#import <Foundation/Foundation.h>
#import <CoreVideo/CoreVideo.h>
@interface ProcessPixelBuffer : NSObject
- (void)processWithCVPixelBuffer:(CVPixelBufferRef)pixelBuffer;
@end
修改GPUImage源码：
GPUImageRawDataInput.m
- (void)uploadBytes:(GLubyte *)bytesToUpload;
{
[GPUImageContext useImageProcessingContext];
// TODO: This probably isn't right, and will need to be corrected
outputFramebuffer = [[GPUImageContext sharedFramebufferCache] fetchFramebufferForSize:uploadedImageSize textureOptions:self.outputTextureOptions onlyTexture:YES];
glBindTexture(GL_TEXTURE_2D, [outputFramebuffer texture]);
// glTexImage2D(GL_TEXTURE_2D, 0, _pixelFormat, (int)uploadedImageSize.width, (int)uploadedImageSize.height, 0, (GLint)_pixelFormat, (GLenum)_pixelType, bytesToUpload); //gongjia mask
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (int)uploadedImageSize.width, (int)uploadedImageSize.height, 0, (GLint)GL_BGRA, (GLenum)_pixelType, bytesToUpload); //gongjia add
}
- (void)processData;
{
if (dispatch_semaphore_wait(dataUpdateSemaphore, DISPATCH_TIME_NOW) != 0)
{
return;
}
runAsynchronouslyOnVideoProcessingQueue(^{
+ [GPUImageContext useImageProcessingContext]; //gongjia add
CGSize pixelSizeOfImage = [self outputImageSize];
GPUImageFrameBuffer.m新增
// modified by gongjia
- (CVPixelBufferRef)getRenderTarget {
return renderTarget;
}
GPUImageFrameBuffer.h新增
- (CVPixelBufferRef)getRenderTarget;
这样改ProcessPixelBuffer.m还是有问题，进不去析构函数,原因就出在那个setFrameProcessingCompletionBlock上，这个坑前面遇到过，会造成cycle
所以要用weak;
__weak typeof(self) ws = self;
#import "ProcessPixelBuffer.h"
#import "YFGPUImageCameraBeautyFilters.h"
@interface ProcessPixelBuffer (){
GPUImageFilter *_beautityFilter;
GPUImageRawDataInput *_rawDataInputFilter;
}
@property (nonatomic, strong) dispatch_semaphore_t semaphore;
@property (nonatomic) CVPixelBufferRef imageBuffer;
@end
@implementation ProcessPixelBuffer
- (instancetype)init
{
self = [super init];
if (self) {
_semaphore = dispatch_semaphore_create(0);
_rawDataInputFilter = [[GPUImageRawDataInput alloc] initWithBytes:nil size:CGSizeMake(0, 0)];
_beautityFilter = [[GPUImageFilter alloc] initWithFragmentShaderFromString:kGPUImageBeautifyFragmentShaderString_Level_5];
__weak typeof(self) ws = self;
[_beautityFilter setFrameProcessingCompletionBlock:^(GPUImageOutput *output, CMTime time) {
GPUImageFramebuffer *imageFramebuffer = output.framebufferForOutput;
glFinish();
ws.imageBuffer = [imageFramebuffer getRenderTarget];
dispatch_semaphore_signal(ws.semaphore);
}];
[_rawDataInputFilter addTarget:_beautityFilter];
}
return self;
}
- (void)processWithCVPixelBuffer:(CVPixelBufferRef)pixelBuffer{
CVPixelBufferLockBaseAddress(pixelBuffer, 0);
//从 CVImageBufferRef 取得影像的细部信息
uint8_t *base;
size_t width, height, bytesPerRow, size;
base = CVPixelBufferGetBaseAddress(pixelBuffer);
width = CVPixelBufferGetWidth(pixelBuffer);
height = CVPixelBufferGetHeight(pixelBuffer);
bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer);
[_rawDataInputFilter updateDataFromBytes:base size:CGSizeMake(bytesPerRow/4, height)];
[_rawDataInputFilter processData];
dispatch_semaphore_wait(self.semaphore, DISPATCH_TIME_FOREVER);
CVPixelBufferLockBaseAddress(self.imageBuffer, 0);
uint8_t *data = CVPixelBufferGetBaseAddress(self.imageBuffer);
size = CVPixelBufferGetDataSize(self.imageBuffer);
memcpy(base,data,size);
CVPixelBufferUnlockBaseAddress(self.imageBuffer, 0);
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
}
-(void)dealloc{
[_beautityFilter removeAllTargets];
}
@end
参考的是GPUImageHistogramEqualizationFilter.m源码
- (id)initWithHistogramType:(GPUImageHistogramType)newHistogramType
{
if (!(self = [super init]))
{
return nil;
}
histogramFilter = [[GPUImageHistogramFilter alloc] initWithHistogramType:newHistogramType];
[self addFilter:histogramFilter];
GLubyte dummyInput[4 * 256]; // NB: No way to initialise GPUImageRawDataInput without providing bytes
//实现协议GPUImageInput，可以接受响应链的图像信息，并且以二进制的格式返回数据；
rawDataInputFilter = [[GPUImageRawDataInput alloc] initWithBytes:dummyInput size:CGSizeMake(256.0, 1.0) pixelFormat:GPUPixelFormatBGRA type:GPUPixelTypeUByte];
//继承GPUImageOutput类，可以接受二进制数据，按照特定的颜色格式，把数据转成图像并传入响应链
rawDataOutputFilter = [[GPUImageRawDataOutput alloc] initWithImageSize:CGSizeMake(256.0, 3.0) resultsInBGRAFormat:YES];
__unsafe_unretained GPUImageRawDataOutput *_rawDataOutputFilter = rawDataOutputFilter;
__unsafe_unretained GPUImageRawDataInput *_rawDataInputFilter = rawDataInputFilter;
[rawDataOutputFilter setNewFrameAvailableBlock:^{
unsigned int histogramBins[3][256];
[_rawDataOutputFilter lockFramebufferForReading];
//属性： 二进制数据的指针；
GLubyte *data = [_rawDataOutputFilter rawBytesForImage];
data += [_rawDataOutputFilter bytesPerRowInOutput];
histogramBins[0][0] = *data++;
histogramBins[1][0] = *data++;
histogramBins[2][0] = *data++;
data++;
for (unsigned int x = 1; x < 256; x++) {
histogramBins[0][x] = histogramBins[0][x-1] + *data++;
histogramBins[1][x] = histogramBins[1][x-1] + *data++;
histogramBins[2][x] = histogramBins[2][x-1] + *data++;
data++;
}
[_rawDataOutputFilter unlockFramebufferAfterReading];
GLubyte colorMapping[4 * 256];
GLubyte *_colorMapping = colorMapping;
for (unsigned int x = 0; x < 256; x++) {
*_colorMapping++ = (GLubyte) (((histogramBins[0][x] - histogramBins[0][0]) * 255) / histogramBins[0][255]);
*_colorMapping++ = (GLubyte) (((histogramBins[1][x] - histogramBins[1][0]) * 255) / histogramBins[1][255]);
*_colorMapping++ = (GLubyte) (((histogramBins[2][x] - histogramBins[2][0]) * 255) / histogramBins[2][255]);
*_colorMapping++ = 255;
}
_colorMapping = colorMapping;
[_rawDataInputFilter updateDataFromBytes:_colorMapping size:CGSizeMake(256.0, 1.0)];
[_rawDataInputFilter processData];
}];
[histogramFilter addTarget:rawDataOutputFilter];
NSString *fragmentShader = nil;
switch (newHistogramType) {
case kGPUImageHistogramRed:
fragmentShader = kGPUImageRedHistogramEqualizationFragmentShaderString;
break;
case kGPUImageHistogramGreen:
fragmentShader = kGPUImageGreenHistogramEqualizationFragmentShaderString;
break;
case kGPUImageHistogramBlue:
fragmentShader = kGPUImageBlueHistogramEqualizationFragmentShaderString;
break;
default:
case kGPUImageHistogramRGB:
fragmentShader = kGPUImageRGBHistogramEqualizationFragmentShaderString;
break;
case kGPUImageHistogramLuminance:
fragmentShader = kGPUImageLuminanceHistogramEqualizationFragmentShaderString;
break;
}
GPUImageFilter *equalizationFilter = [[GPUImageTwoInputFilter alloc] initWithFragmentShaderFromString:fragmentShader];
[rawDataInputFilter addTarget:equalizationFilter atTextureLocation:1];
[self addFilter:equalizationFilter];
self.initialFilters = [NSArray arrayWithObjects:histogramFilter, equalizationFilter, nil];
self.terminalFilter = equalizationFilter;
self.downsamplingFactor = 16;
return self;
}
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