apple 与pixfmt 对应关系

static const struct {
    uint32_t cv_fmt;
    bool full_range;
    enum AVPixelFormat pix_fmt;
} cv_pix_fmts[] = {
    { kCVPixelFormatType_420YpCbCr8Planar,              false, AV_PIX_FMT_YUV420P },
    { kCVPixelFormatType_422YpCbCr8,                    false, AV_PIX_FMT_UYVY422 },
    { kCVPixelFormatType_32BGRA,                        false, AV_PIX_FMT_BGRA },
#ifdef kCFCoreFoundationVersionNumber10_7
    { kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange,  false, AV_PIX_FMT_NV12 },
    { kCVPixelFormatType_420YpCbCr8BiPlanarFullRange,   true,  AV_PIX_FMT_NV12 },
    { kCVPixelFormatType_4444AYpCbCr16,                 false, AV_PIX_FMT_AYUV64 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_420YPCBCR10BIPLANARVIDEORANGE
    { kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange, false, AV_PIX_FMT_P010 },
    { kCVPixelFormatType_420YpCbCr10BiPlanarFullRange,  true,  AV_PIX_FMT_P010 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_422YPCBCR8BIPLANARVIDEORANGE
    { kCVPixelFormatType_422YpCbCr8BiPlanarVideoRange,  false, AV_PIX_FMT_NV16 },
    { kCVPixelFormatType_422YpCbCr8BiPlanarFullRange,   true,  AV_PIX_FMT_NV16 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_422YPCBCR10BIPLANARVIDEORANGE
    { kCVPixelFormatType_422YpCbCr10BiPlanarVideoRange, false, AV_PIX_FMT_P210 },
    { kCVPixelFormatType_422YpCbCr10BiPlanarFullRange,  true,  AV_PIX_FMT_P210 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_422YPCBCR16BIPLANARVIDEORANGE
    { kCVPixelFormatType_422YpCbCr16BiPlanarVideoRange, false, AV_PIX_FMT_P216 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_444YPCBCR8BIPLANARVIDEORANGE
    { kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange,  false, AV_PIX_FMT_NV24 },
    { kCVPixelFormatType_444YpCbCr8BiPlanarFullRange,   true,  AV_PIX_FMT_NV24 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_444YPCBCR10BIPLANARVIDEORANGE
    { kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange, false, AV_PIX_FMT_P410 },
    { kCVPixelFormatType_444YpCbCr10BiPlanarFullRange,  true,  AV_PIX_FMT_P410 },
#endif
#if HAVE_KCVPIXELFORMATTYPE_444YPCBCR16BIPLANARVIDEORANGE
    { kCVPixelFormatType_444YpCbCr16BiPlanarVideoRange, false, AV_PIX_FMT_P416 },
#endif
};