电话AVAssetWriterInputPixelBufferAdaptor的appendPixelBuffer导致EXC_BAD_ACCESS

我生成从一个OpenGL层CVPixelBufferRef这样电话AVAssetWriterInputPixelBufferAdaptor的appendPixelBuffer导致EXC_BAD_ACCESS

- (CVPixelBufferRef) getGLPixelBuf { 
    int s = 1; 
    UIScreen * screen = [UIScreen mainScreen]; 
    if ([screen respondsToSelector:@selector(scale)]){ 
     s = (int)[screen scale]; 
    } 
    const int w = self.frame.size.width/2; 
    const int h = self.frame.size.height/2; 
    const NSInteger my_data_length = 4 * w * h * s * s; 
    // allocate array and read pixels into it. 
    GLubyte * buffer = malloc(my_data_length); 

    GLint readType; 
    GLint readFormat; 
    glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &readType); 
    glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &readFormat); 

    glReadPixels(0, 0, w * s, h * s, readFormat, readType, buffer); 

    // gl renders "upside down" so swap top to bottom into new array. 
    GLubyte * buffer2 = malloc(my_data_length); 

    for(int y = 0; y < h*s; y++){ 
     memcpy(buffer2 + (h * s - 1 - y) * 4 * w * s, buffer + (4 * y * w * s), 4 * w * s); 
    } 

    free(buffer); 
    CVPixelBufferRef pixel_buffer = NULL; 
    CVPixelBufferCreateWithBytes (NULL, w * 2, h * 2, kCVPixelFormatType_32BGRA, buffer2 , 4 * w * s, NULL, 0, NULL, &pixel_buffer); 
    free(buffer2); 

    return pixel_buffer; 
}

，然后通过该像素缓冲区我一个AVAssetWriterInputPixelBufferAdaptor一个辅助类里面是这样的：

- (void)recordFrame { 
    if([recorder isRecording]){ 
     CVPixelBufferRef pixelBuffer = [self getGLPixelBuf]; 
     CVPixelBufferLockBaseAddress(pixelBuffer, 0); 

     [recorder appendPixelBuffer:pixelBuffer withPresentationTime:camera.lastSampleTime]; 

     CVPixelBufferUnlockBaseAddress(pixelBuffer, 0); 
     CVPixelBufferRelease(pixelBuffer); 
    } 
}

但是在那个帮手类里面，以下

- (BOOL)appendPixelBuffer:(CVPixelBufferRef)pixelBuffer withPresentationTime:(CMTime)presentationTime { 
    if (writerInput.readyForMoreMediaData)  
     return [adaptor appendPixelBuffer:pixelBuffer withPresentationTime:presentationTime]; 
    return NO; 
}

会在执行appendPixelBuffer调用时导致EXC_BAD_ACCESS。我启用了NSZombieEnabled，但它没有提供任何信息。记录器初始化的高度和宽度与OpenGL图层的背景高度和宽度相同。该适配器配置为kCVPixelFormatType_32BGRA像素格式以及像素缓冲区。

任何帮助表示赞赏！谢谢！

来源

2011-06-15 davidbitton

返回之前pixel_buffer有你和调试检查，不要锁定像素缓冲区并发现它确切地得到错误的线？ – 2011-06-16 05:16:12

您发送的参数与被调用方法中的对象相同吗？ – 2011-06-16 05:17:27

我现在工作。看起来像我的像素缓冲区正在脱离上下文。我将上述两种方法合并为一种，而我不再收到EXC_BAD_ACCESS。 – davidbitton 2011-06-20 02:12:51

，当你将其追加到适配器和方法- (CVPixelBufferRef) getGLPixelBuf;返回你的pixel_buffer不保留，使用CVPixelBufferRelease(pixelBuffer);在- (void)recordFrame;方法，你需要保留从- (CVPixelBufferRef) getGLPixelBuf;

来源

2014-06-23 09:09:55

电话AVAssetWriterInputPixelBufferAdaptor的appendPixelBuffer导致EXC_BAD_ACCESS

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