本文共 22461 字，大约阅读时间需要 74 分钟。
参考文章
初始化解码器相关变量
-(void)initDecoder{ if (decodeFrame) { return; } int codec_id = AV_CODEC_ID_H264; pCodec = avcodec_find_decoder(codec_id); if (!pCodec) { perror("find codec err"); return; } decodeFrame = av_frame_alloc(); if (!decodeFrame) { perror("alloc frame err"); return; } pCodecCtx = avcodec_alloc_context3(pCodec); pCodecCtx->codec_id = codec_id; if (!pCodecCtx) { perror("pcodecx err"); return; } pParserCtx = av_parser_init(codec_id); if (!pParserCtx) { perror("pParserctx err"); return; } av_init_packet(&package); int open_ret = avcodec_open2(pCodecCtx, pCodec, NULL); if (open_ret<0) { perror("open decoder err"); return; } } 解码，buffer就是读取的裸流，len是长度
-(void)decodeVideo:(char *)buffer length:(int)len{ if (len<=0) { return; } [self initDecoder]; int in_len = len; uint8_t *in_buffer = (uint8_t*)buffer; uint8_t *out_buffer = NULL; int out_len = 0; while (in_len>0) { int lens = av_parser_parse2(pParserCtx, pCodecCtx, &out_buffer, &out_len, in_buffer, in_len, 0, 0, 0); in_len -= lens; in_buffer += lens; if (out_len<=0) { continue; } switch (pParserCtx->pict_type) { case AV_PICTURE_TYPE_P: NSLog(@"====>P"); break; case AV_PICTURE_TYPE_I: NSLog(@"====>I"); break; case AV_PICTURE_TYPE_B: NSLog(@"====>B"); break; default: NSLog(@"other"); break; } package.data = out_buffer; package.size = out_len; int finished = -1; //int decoded_ret = avcodec_decode_video2(pCodecCtx, decodeFrame, &finished, &package); /* 下方的avcodec_send_packet() 和 avcodec_receive_frame()替代avcodec_decode_video2()函数 */ int send_ret = avcodec_send_packet(pCodecCtx, &package); if (send_ret!=0) { return; } while (avcodec_receive_frame(pCodecCtx, decodeFrame)==0) { NSLog(@"decode succes"); } // if (decoded_ret<0) { // perror("decode err");// return;// } } } 解码结束之后释放内存
-(void)releaseFrames{ if (pCodecCtx) { avcodec_close(pCodecCtx); avcodec_free_context(&pCodecCtx); pCodecCtx = NULL; } if (decodeFrame) { av_frame_unref(decodeFrame); decodeFrame = NULL; } av_packet_unref(&package); if (buffer) { free(buffer); buffer = NULL; } } 下面提供一个解码rtsp 流的一个demo
ZbOpenGLView 是渲染播放 yuv视频的一个类，后面提供代码
先放读取流和解码的代码
DecodeManager.h
#import #import "ZbOpenGLView.h"NS_ASSUME_NONNULL_BEGIN@interface DecodeManager : NSObject+(instancetype)sharedInstance;-(void)decodeRtspStreams:(ZbOpenGLView*)displayView;@endNS_ASSUME_NONNULL_END
DecodeManager.m
#import "DecodeManager.h"#include #import #import #import #import @interface DecodeManager()@property(nonatomic,strong)ZbOpenGLView *displayView;@end@implementation DecodeManagerstatic DecodeManager *instance=nil;+(instancetype)sharedInstance{ static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ instance =[[DecodeManager alloc]init]; }); return instance;}-(void)decodeRtspStreams:(ZbOpenGLView*)displayView{ self.displayView = displayView;// AVPacket *pPacket=0; AVFrame *pFrame=0; av_register_all(); //注册解码控件 avcodec_register_all(); avformat_network_init(); NSString *rstpUrl = @"rtsp://184.72.239.149/vod/mp4://BigBuckBunny_175k.mov";// rstpUrl = @"http://live.hkstv.hk.lxdns.com/live/hks/playlist.m3u8"; AVFormatContext *pFormatCtx = avformat_alloc_context(); //打开输入的视频流 int ret = avformat_open_input(&pFormatCtx, [rstpUrl UTF8String], NULL, NULL); if (ret<0) { NSLog(@"打开 input stream faild"); return; } //找到流信息 ret = avformat_find_stream_info(pFormatCtx, NULL); if (ret<0) { NSLog(@"can not find stream info"); return; } int video_index = -1; for (int i=0; i nb_streams; i++) { if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { video_index = i; break; } } if (video_index==-1) { NSLog(@"can not find video type"); return; } //解码器上下文 AVCodecContext*pCodecCtx = pFormatCtx->streams[video_index]->codec; if (pCodecCtx==NULL) { NSLog(@"解码器上下文 失败"); return; } //寻找解码器 AVCodec *pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec==NULL) { NSLog(@"can not find codec"); return; } //打开解码器 ret = avcodec_open2(pCodecCtx, pCodec, NULL); if (ret<0) { NSLog(@"open codec faild"); return; } //初始化 //初始化解码后的frame容器 pFrame = av_frame_alloc(); AVFrame *pFrameYUV = av_frame_alloc(); AVPacket *packet = av_packet_alloc(); struct SwsContext *img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL); while (1) { if (av_read_frame(pFormatCtx, packet)<0) { break; } int got_picture = -1; //解码 int ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); if (got_picture==1) { sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); [self showWithFrame:pFrame];// [self.displayView displayYUV420pData:pFrameYUV->data[0] width:pFrameYUV -> width height:pFrameYUV ->height]; } } av_packet_free(&packet); av_frame_free(&pFrame); }-(void)showWithFrame:(AVFrame*)_pFrame{ char *buf = (char *)malloc(_pFrame->width * _pFrame->height * 3 / 2); AVPicture *pict; int w, h, i; char *y, *u, *v; pict = (AVPicture *)_pFrame;//这里的frame就是解码出来的AVFrame w = _pFrame->width; h = _pFrame->height; y = buf; u = y + w * h; v = u + w * h / 4; for (i=0; i data[0] + pict->linesize[0] * i, w); for (i=0; i data[1] + pict->linesize[1] * i, w / 2); for (i=0; i data[2] + pict->linesize[2] * i, w / 2); if (buf == NULL) { return; }else { dispatch_async(dispatch_get_global_queue(0, 0), ^{ // sleep(1); [self.displayView displayYUV420pData:buf width:_pFrame -> width height:_pFrame ->height]; free(buf); }); }}@end
下面是 ZbOpenGLView渲染类
//// ZbOpenGLView.h//#import #import #import #import #import #import #include @interface ZbOpenGLView : UIView{ }#pragma mark ----- ----- (void)displayYUV420pData:(void *)data width:(NSInteger)w height:(NSInteger)h;- (void)clearFrame;@end
.m文件
//// OpenGLView.m// MyTest//// Created by smy on 12/20/11.// Copyright (c) 2011 ZY.SYM. All rights reserved.//#import "ZbOpenGLView.h"enum AttribEnum{ ATTRIB_VERTEX, ATTRIB_TEXTURE //ATTRIB_COLOR,};enum TextureType{ TEXY = 0, TEXU, TEXV // TEXC};//#define PRINT_CALL 1@interface ZbOpenGLView(){ /** OpenGL绘图上下文 */ EAGLContext *_glContext; /** 帧缓冲区 */ GLuint _framebuffer; /** 渲染缓冲区 */ GLuint _renderBuffer; /** 着色器句柄 */ GLuint _program; /** YUV纹理数组 */ GLuint _textureYUV[4]; /** 视频宽度 */ GLuint _videoW; /** 视频高度 */ GLuint _videoH; GLsizei _viewScale; //void *_pYuvData; #ifdef DEBUG struct timeval _time; NSInteger _frameRate;#endif}/** 初始化YUV纹理 */- (void)setupYUVTexture;/** 创建缓冲区 @return 成功返回TRUE 失败返回FALSE */- (BOOL)createFrameAndRenderBuffer;/** 销毁缓冲区 */- (void)destoryFrameAndRenderBuffer;//加载着色器/** 初始化YUV纹理 */- (void)loadShader;/** 编译着色代码 @param shader 代码 @param shaderType 类型 @return 成功返回着色器 失败返回－1 */- (GLuint)compileShader:(NSString*)shaderCode withType:(GLenum)shaderType;/** 渲染 */- (void)render;- (void)setVideoSize:(GLuint)width height:(GLuint)height;@end@implementation ZbOpenGLView//- (void)debugGlError//{ // GLenum r = glGetError();// if (r != 0)// { // printf("%d \n", r);// }//}- (BOOL)doInit{ CAEAGLLayer *eaglLayer = (CAEAGLLayer*) self.layer; //eaglLayer.opaque = YES; eaglLayer.opaque = YES; eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, //[NSNumber numberWithBool:YES], kEAGLDrawablePropertyRetainedBacking, nil]; self.contentScaleFactor = [UIScreen mainScreen].scale; _viewScale = [UIScreen mainScreen].scale; _glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; //[self debugGlError]; if(!_glContext || ![EAGLContext setCurrentContext:_glContext]) { return NO; } [self setupYUVTexture]; [self loadShader]; glUseProgram(_program); GLuint textureUniformY = glGetUniformLocation(_program, "SamplerY"); GLuint textureUniformU = glGetUniformLocation(_program, "SamplerU"); GLuint textureUniformV = glGetUniformLocation(_program, "SamplerV"); glUniform1i(textureUniformY, 0); glUniform1i(textureUniformU, 1); glUniform1i(textureUniformV, 2); printf("InitGL"); return YES;}- (id)initWithCoder:(NSCoder *)aDecoder{ self = [super initWithCoder:aDecoder]; if (self) { if (![self doInit]) { self = nil; } } return self;}- (id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { if (![self doInit]) { self = nil; } } return self;}- (void)layoutSubviews{ [super layoutSubviews]; dispatch_async(dispatch_get_global_queue(0, 0), ^{ @synchronized(self) { [EAGLContext setCurrentContext:_glContext]; [self destoryFrameAndRenderBuffer]; [self createFrameAndRenderBuffer]; } glViewport(1, 1, self.bounds.size.width*_viewScale - 2, self.bounds.size.height*_viewScale - 2); });}- (void)setupYUVTexture{ if (_textureYUV[TEXY]) { glDeleteTextures(4, _textureYUV); } glGenTextures(4, _textureYUV); if (!_textureYUV[TEXY] || !_textureYUV[TEXU] || !_textureYUV[TEXV]) { NSLog(@"<<<<<<<<<<< <纹理创建失败!> >>>>>>>>>>>"); return; } glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXY]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXU]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glActiveTexture(GL_TEXTURE2); glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXV]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); }- (void)render{ [EAGLContext setCurrentContext:_glContext]; CGSize size = self.bounds.size; glViewport(1, 1, size.width*_viewScale-2, size.height*_viewScale-2); static const GLfloat squareVertices[] = { -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f, }; static const GLfloat coordVertices[] = { 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, }; // Update attribute values glVertexAttribPointer(ATTRIB_VERTEX, 2, GL_FLOAT, 0, 0, squareVertices); glEnableVertexAttribArray(ATTRIB_VERTEX); glVertexAttribPointer(ATTRIB_TEXTURE, 2, GL_FLOAT, 0, 0, coordVertices); glEnableVertexAttribArray(ATTRIB_TEXTURE); // Draw glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer); GLenum err = glGetError(); if (err != GL_NO_ERROR) { printf("GL_ERROR 11111=======>%d\n", err); } [_glContext presentRenderbuffer:GL_RENDERBUFFER]; err = glGetError(); if (err != GL_NO_ERROR) { printf("GL_ERROR 22222=======>%d\n", err); }}#pragma mark - 设置openGL+ (Class)layerClass{ return [CAEAGLLayer class];}- (BOOL)createFrameAndRenderBuffer{ glGenFramebuffers(1, &_framebuffer); glGenRenderbuffers(1, &_renderBuffer); glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer); glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer); if (![_glContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer]) { NSLog(@"attach渲染缓冲区失败"); } glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _renderBuffer); if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { NSLog(@"创建缓冲区错误 0x%x", glCheckFramebufferStatus(GL_FRAMEBUFFER)); return NO; } return YES;}- (void)destoryFrameAndRenderBuffer{ if (_framebuffer) { glDeleteFramebuffers(1, &_framebuffer); } if (_renderBuffer) { glDeleteRenderbuffers(1, &_renderBuffer); } _framebuffer = 0; _renderBuffer = 0;}#define FSH @"varying lowp vec2 TexCoordOut;\\uniform sampler2D SamplerY;\uniform sampler2D SamplerU;\uniform sampler2D SamplerV;\\void main(void)\{\ mediump vec3 yuv;\ lowp vec3 rgb;\ \ yuv.x = texture2D(SamplerY, TexCoordOut).r;\ yuv.y = texture2D(SamplerU, TexCoordOut).r - 0.5;\ yuv.z = texture2D(SamplerV, TexCoordOut).r - 0.5;\ \ rgb = mat3( 1, 1, 1,\ 0, -0.39465, 2.03211,\ 1.13983, -0.58060, 0) * yuv;\ \ gl_FragColor = vec4(rgb, 1);\ \}"#define VSH @"attribute vec4 position;\attribute vec2 TexCoordIn;\varying vec2 TexCoordOut;\\void main(void)\{\ gl_Position = position;\ TexCoordOut = TexCoordIn;\}"#define FSH2 @"attribute vec4 Position; \attribute vec2 TextureCoords; \varying vec2 TextureCoordsOut; \void main(void) \{ \//用来展现纹理的多边形顶点 \gl_Position = Position; \//表示使用的纹理的范围的顶点，因为是2D纹理，所以用vec2类型 \TextureCoordsOut = TextureCoords; \}"#define VSH2 @"precision mediump float; \uniform sampler2D Texture; \varying vec2 TextureCoordsOut; \void main(void) \{ \//获取纹理的像素 \vec4 mask = texture2D(Texture, TextureCoordsOut); \gl_FragColor = vec4(mask.rgb, 1.0); \}"/** 加载着色器 */- (void)loadShader{ /** 1 */ GLuint vertexShader = [self compileShader:VSH withType:GL_VERTEX_SHADER]; GLuint fragmentShader = [self compileShader:FSH withType:GL_FRAGMENT_SHADER]; /** 2 */ _program = glCreateProgram(); glAttachShader(_program, vertexShader); glAttachShader(_program, fragmentShader); /** 绑定需要在link之前 */ glBindAttribLocation(_program, ATTRIB_VERTEX, "position"); glBindAttribLocation(_program, ATTRIB_TEXTURE, "TexCoordIn"); glLinkProgram(_program); /** 3 */ GLint linkSuccess; glGetProgramiv(_program, GL_LINK_STATUS, &linkSuccess); if (linkSuccess == GL_FALSE) { GLchar messages[256]; glGetProgramInfoLog(_program, sizeof(messages), 0, &messages[0]); NSString *messageString = [NSString stringWithUTF8String:messages]; NSLog(@"<<< <着色器连接失败 %@> >>", messageString); //exit(1); } if (vertexShader) glDeleteShader(vertexShader); if (fragmentShader) glDeleteShader(fragmentShader);}- (GLuint)compileShader:(NSString*)shaderString withType:(GLenum)shaderType{ /** 1 */ if (!shaderString) { // NSLog(@"Error loading shader: %@", error.localizedDescription); // exit(1); } else { //NSLog(@"shader code-->%@", shaderString); } /** 2 */ GLuint shaderHandle = glCreateShader(shaderType); /** 3 */ const char * shaderStringUTF8 = [shaderString UTF8String]; int shaderStringLength = (int)[shaderString length]; glShaderSource(shaderHandle, 1, &shaderStringUTF8, &shaderStringLength); /** 4 */ glCompileShader(shaderHandle); /** 5 */ GLint compileSuccess; glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &compileSuccess); if (compileSuccess == GL_FALSE) { GLchar messages[256]; glGetShaderInfoLog(shaderHandle, sizeof(messages), 0, &messages[0]); NSString *messageString = [NSString stringWithUTF8String:messages]; NSLog(@"%@", messageString); exit(1); } return shaderHandle;}#pragma mark - 接口- (void)displayYUV420pData:(void *)data width:(NSInteger)w height:(NSInteger)h{ //_pYuvData = data; // if (_offScreen || !self.window) { // return; } @synchronized(self) { if (w != _videoW || h != _videoH) { GLenum err = glGetError(); if (err != GL_NO_ERROR) { printf("GL_ERROR111=======>%d\n", err); } [self setVideoSize:(GLuint)w height:(GLuint)h]; } if(data == NULL) { GLenum err = glGetError(); if (err != GL_NO_ERROR) { printf("GL_ERROR111222=======>%d\n", err); } } [EAGLContext setCurrentContext:_glContext]; glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXY]); glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, (GLuint)w, (GLuint)h, GL_RED_EXT, GL_UNSIGNED_BYTE, data); //[self debugGlError]; glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXU]); glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, (GLuint)w/2, (GLuint)h/2, GL_RED_EXT, GL_UNSIGNED_BYTE, data + w * h); // [self debugGlError]; glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXV]); glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, (GLuint)w/2, (GLuint)h/2, GL_RED_EXT, GL_UNSIGNED_BYTE, data + w * h * 5 / 4); [self render]; } #ifdef DEBUG GLenum err = glGetError(); if (err != GL_NO_ERROR) { printf("GL_ERROR=======>%d\n", err); } struct timeval nowtime; gettimeofday(&nowtime, NULL); if (nowtime.tv_sec != _time.tv_sec) { //printf("视频 %ld 帧率: %ld\n", (long)self.tag, (long)_frameRate); memcpy(&_time, &nowtime, sizeof(struct timeval)); _frameRate = 1; } else { _frameRate++; } #endif}- (void)setVideoSize:(GLuint)width height:(GLuint)height{ _videoW = width; _videoH = height; void *blackData = malloc(width * height * 1.5); if(blackData) //bzero(blackData, width * height * 1.5); memset(blackData, 0x0, width * height * 1.5); [EAGLContext setCurrentContext:_glContext]; glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXY]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED_EXT, width, height, 0, GL_RED_EXT, GL_UNSIGNED_BYTE, blackData); glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXU]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED_EXT, width/2, height/2, 0, GL_RED_EXT, GL_UNSIGNED_BYTE, blackData + width * height); glBindTexture(GL_TEXTURE_2D, _textureYUV[TEXV]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED_EXT, width/2, height/2, 0, GL_RED_EXT, GL_UNSIGNED_BYTE, blackData + width * height * 5 / 4); free(blackData);}- (void)clearFrame{ if ([self window]) { [EAGLContext setCurrentContext:_glContext]; glClearColor(0.0, 0.0, 0.0, 0.1); glClear(GL_COLOR_BUFFER_BIT); glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer); [_glContext presentRenderbuffer:GL_RENDERBUFFER]; } }#if 0- (void)clearFrame:(UIImage *)img{ void *blackData = malloc(640 * 360 * 1.5); if(blackData) //bzero(blackData, width * height * 1.5); memset(blackData, 0x0, 640 * 360 * 1.5); GLuint texture = [self createOGLTexture:img]; glBindTexture(GL_TEXTURE_2D, texture); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED_EXT, 640, 360, 0, GL_RED_EXT, GL_UNSIGNED_BYTE, blackData); free(blackData); //glBegin(GL_QUADS); //glTexCoord2d(0.0, 0.0); //glVertex2d(-1.0, -1.0); //glTexCoord2d(1.0, 0.0); glVertex2d(+1.0, -1.0); //glTexCoord2d(1.0, 1.0); glVertex2d(+1.0, +1.0); //glTexCoord2d(0.0, 1.0); glVertex2d(-1.0, +1.0); //glEnd();}-(GLuint)createOGLTexture:(UIImage *)image{ //转换为CGImage，获取图片基本参数 CGImageRef cgImageRef = [image CGImage]; GLuint width = (GLuint)CGImageGetWidth(cgImageRef); GLuint height = (GLuint)CGImageGetHeight(cgImageRef); CGRect rect = CGRectMake(0, 0, width, height); //绘制图片 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); void *imageData = malloc(width * height * 4); CGContextRef context = CGBitmapContextCreate(imageData, width, height, 8, width * 4, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big); CGContextTranslateCTM(context, 0, height); CGContextScaleCTM(context, 1.0f, -1.0f); CGColorSpaceRelease(colorSpace); CGContextClearRect(context, rect); CGContextDrawImage(context, rect, cgImageRef); //纹理一些设置，可有可无 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); //生成纹理 glEnable(GL_TEXTURE_2D); GLuint textureID; glGenTextures(1, &textureID); glBindTexture(GL_TEXTURE_2D, textureID); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData); //绑定纹理位置 glBindTexture(GL_TEXTURE_2D, 0); //释放内存 CGContextRelease(context); free(imageData); return textureID;}#endif@end 转载地址：http://oqnvb.baihongyu.com/