我正在尝试将从AVPlayerItemVideoOutput提取的pixelBuffer转换为CIImage,但总是为零。
守则
if([videoOutput_ hasNewPixelBufferForItemTime:player_.internalPlayer.currentItem.currentTime])
{
CVPixelBufferRef pixelBuffer = [videoOutput_ copyPixelBufferForItemTime:player_.internalPlayer.currentItem.currentTime
itemTimeForDisplay:nil];
CIImage *image = [CIImage imageWithCVPixelBuffer:pixelBuffer]; // Always image === nil
CIFilter *filter = [FilterCollection filterSepiaForImage:image];
image = filter.outputImage;
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgimg = [context createCGImage:image fromRect:[image extent]];
[pipLayer_ setContents:(id)CFBridgingRelease(cgimg)];
}
以下是用于创建CIImage的pixelBuffer
的详细信息(总是导致nil):
$0 = 0x09b48720 <CVPixelBuffer 0x9b48720 width=624 height=352 bytesPerRow=2496 pixelFormat=BGRA iosurface=0x0 attributes=<CFBasicHash 0x98241d0 [0x1d244d8]>{type = immutable dict, count = 3,
entries =>
0 : <CFString 0x174cf4 [0x1d244d8]>{contents = "Height"} = <CFNumber 0x9a16e70 [0x1d244d8]>{value = +352, type = kCFNumberSInt32Type}
1 : <CFString 0x174ce4 [0x1d244d8]>{contents = "Width"} = <CFNumber 0x9a109d0 [0x1d244d8]>{value = +624, type = kCFNumberSInt32Type}
2 : <CFString 0x1750e4 [0x1d244d8]>{contents = "PixelFormatType"} = <CFArray 0x1090ddd0 [0x1d244d8]>{type = mutable-small, count = 1, values = (
0 : <CFNumber 0x7a28050 [0x1d244d8]>{value = +1111970369, type = kCFNumberSInt32Type}
)}
}
propagatedAttachments=<CFBasicHash 0x9b485c0 [0x1d244d8]>{type = mutable dict, count = 6,
entries =>
0 : <CFString 0x174ff4 [0x1d244d8]>{contents = "CVImageBufferTransferFunction"} = <CFString 0x174f84 [0x1d244d8]>{contents = "ITU_R_709_2"}
2 : <CFString 0x174f74 [0x1d244d8]>{contents = "CVImageBufferYCbCrMatrix"} = <CFString 0x174f94 [0x1d244d8]>{contents = "ITU_R_601_4"}
9 : <CFString 0x174f14 [0x1d244d8]>{contents = "CVPixelAspectRatio"} = <CFBasicHash 0x9b1bc30 [0x1d244d8]>{type = immutable dict, count = 2,
entries =>
0 : <CFString 0x174f34 [0x1d244d8]>{contents = "VerticalSpacing"} = <CFNumber 0x9b0f730 [0x1d244d8]>{value = +1, type = kCFNumberSInt32Type}
2 : <CFString 0x174f24 [0x1d244d8]>{contents = "HorizontalSpacing"} = <CFNumber 0x9b0f730 [0x1d244d8]>{value = +1, type = kCFNumberSInt32Type}
}
10 : <CFString 0x174fb4 [0x1d244d8]>{contents = "CVImageBufferColorPrimaries"} = <CFString 0x174fd4 [0x1d244d8]>{contents = "SMPTE_C"}
11 : <CFString 0x174e24 [0x1d244d8]>{contents = "QTMovieTime"} = <CFBasicHash 0x7a47940 [0x1d244d8]>{type = immutable dict, count = 2,
entries =>
0 : <CFString 0x174e44 [0x1d244d8]>{contents = "TimeScale"} = <CFNumber 0x7a443d0 [0x1d244d8]>{value = +90000, type = kCFNumberSInt32Type}
2 : <CFString 0x174e34 [0x1d244d8]>{contents = "TimeValue"} = <CFNumber 0x7a476e0 [0x1d244d8]>{value = +1047297, type = kCFNumberSInt64Type}
}
12 : <CFString 0x174eb4 [0x1d244d8]>{contents = "CVFieldCount"} = <CFNumber 0x9b0f730 [0x1d244d8]>{value = +1, type = kCFNumberSInt32Type}
}
nonPropagatedAttachments=<CFBasicHash 0x9b44b40 [0x1d244d8]>{type = mutable dict, count = 0,
entries =>
}
>
答案 0 :(得分:10)
解决了这个问题 - 我在模拟器上尝试,而它似乎只在设备上支持。
答案 1 :(得分:2)
您似乎没有定义iosurface属性键。不是100%它会解决你的问题,但试试这个:
CFDictionaryRef attrs = (CFDictionaryRef)@{
(id)kCVPixelBufferWidthKey: @(WIDTH_OF_YOUR_VIDEO_GOES_HERE),
(id)kCVPixelBufferHeightKey: @(HEIGHT_OF_YOUR_VIDEO_GOES_HERE),
(id)kCVPixelBufferPixelFormatTypeKey: @(kCVPixelFormatType_420YpCbCr8BiPlanarFullRange;), // kCVPixelFormatType_32BGRA
(id)kCVPixelBufferIOSurfacePropertiesKey: @{},
}
在创建pixelbuffer期间将此词典与其他键一起传递
答案 2 :(得分:0)
这不是你设置图层内容的方式;这是:
(__ bridge id)uiImage.CGImage;
你无法获得在设备或模拟器上工作的东西。