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BytesPerRowとは

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CoreVideoのPixelBufferから取得できる値にBytesPerRowというものがある。

CVPixelBufferGetBytesPerRow(pixelBuffer:) -> Int

BytesPerRowは、その名の通り、ピクセルバッファの1行あたりのバイト数のことである。

例えば1920x1080のPixelBufferの場合は7680を得る。
これは1ピクセルが4byteで表現されているからである。

余談だが、bytePerRowを4で割れば横幅を導き出せる。(が、CVPixelBufferGetWidth(pixelBuffer:)を使えばよい)

ちなみにPixelBufferがplanerの場合は、横幅x高さの画像全部のbyte数が返ってくるらしい

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