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mp4再生で半透明になる問題修正 #24
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mp4再生で半透明になる問題修正 #24
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huiping192
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noppefoxwolf
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Jan 27, 2022
| private let commandQueue: MTLCommandQueue | ||
| private let textureCache: CVMetalTextureCache | ||
| private let pipelineState: MTLRenderPipelineState | ||
| private let mp4PipelineState: MTLRenderPipelineState |
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pipelineは常に１つのみを保持するようにしてください
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PlayerViewインスタンスが作ったらmp4,hevcどっちでも再生可能なので２つ用意する必要があるが、どこか勘違いしてました？ もしくはlazy initか
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将来的にPlayerViewとPlayer・Assetに分割するのでこの実装のままでもOKとします。
ただし変数名に関してはビデオフォーマットではなくシェーダの実態を表す名前にしてください。
| baseCbCrTexture.sample(colorSampler, in.texCoords).rg, | ||
| 1.0f); | ||
| // yuv video range to full range | ||
| baseYUVColor.r = (baseYUVColor.r - (16.0f/255.0f)) * (255.0f/(235.0f-16.0f)); |
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フルレンジのmp4を読み込んだ場合に意図しない変換が行われるように見えます。
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range shader内で判定できないので、asset読み込みで指定しないといけないが、それであってますか？
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あってます、レンダリング前に判断して分岐する必要があります。
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動画読み込み時にPixelFormatType明示的にvideo rangeに指定しました
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thread blockされたときにメモリー使用量急に増えないようにした
* mp4再生で半透明になる問題
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defaultのPixelFormatが kCVPixelFormatType_420YpCbCr8BiPlanarVideoRangeになっていて、rangeとしては(luma=[16,235] chroma=[16,240])のため、alpha用のr値が0,255になれなかった問題。
metal部分でrange変更追加して修正.
hevcのalpha部分は修正不要なので、処理わけるようにした