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我一直在尝试将.h264视频解码为opengl,但我显示的帧是黑色的。我没有看到任何错误,并且如果我将CMSampleBufferRef中的帧导出到相机胶卷中,它们就没有问题。iOS - 使用OpenGL ES 2.0进行视频解码
也许在openGL方面呢?但是当我显示图像而不是视频时,它可以正常工作,所以不知道在哪里看。
这里是给init视频解码器的代码:
- (void)initVideo {
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &_glTextureHook);
NSURL * url = [NSURL URLWithString:[self.videoMedia getFilePath]];
self.videoAsset = [[AVURLAsset alloc] initWithURL:url options:NULL];
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
[self.videoAsset loadValuesAsynchronouslyForKeys:@[@"tracks"] completionHandler:^{
self.videoTrack = [self.videoAsset tracksWithMediaType:AVMediaTypeVideo][0];
NSString *key = (NSString *) kCVPixelBufferPixelFormatTypeKey;
NSNumber *value = @(kCVPixelFormatType_32BGRA);
NSDictionary *settings = @{key : value};
self.outputVideoTrackOuput = [[AVAssetReaderTrackOutput alloc]
initWithTrack:self.videoTrack outputSettings:settings];
self.assetReader = [[AVAssetReader alloc] initWithAsset:self.videoAsset error:nil];
[self.assetReader addOutput:self.outputVideoTrackOuput];
[self.assetReader startReading];
dispatch_semaphore_signal(sema);
}];
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
}
,并检索所述OpenGL纹理的代码中,视频的每个帧:
- (void)play {
if (self.assetReader.status == AVAssetReaderStatusReading) {
CMSampleBufferRef sampleBuffer = [self.outputVideoTrackOuput copyNextSampleBuffer];
if(sampleBuffer) {
CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
if(pixelBuffer) {
CVPixelBufferLockBaseAddress(pixelBuffer, 0);
glBindTexture(GL_TEXTURE_2D, _glTextureHook);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1920, 1080, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, CVPixelBufferGetBaseAddress(pixelBuffer));
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
}
CFRelease(sampleBuffer);
}
}
}
顶点着色器和片段是对于图像和视频(与图像一起使用)相同。我看到的唯一区别是glTexImage2D,其中两种格式都是GL_RGBA图像。
我确信,视频解码器的_glTextureHook很好地发送到着色器管理器,上下文线程上激活等
这是片段着色器的代码(这是很基本的,同为顶点着色器):
precision lowp float;
uniform sampler2D Texture;
varying vec4 DestinationColor;
varying vec2 TexCoordOut;
void main() {
gl_FragColor = DestinationColor * texture2D(Texture, TexCoordOut);
}
你成功成功确实发挥了openGL下的IOS视频?如果是,你会介意分享代码吗?感谢您的提前! – loki
感谢您的代码,我一直在寻找这样几天的具体例子。像@loki问,你有什么成功?您是否在任何时候都涉及音频? –