avutil/hwcontext_videotoolbox: add frame hwctx to specify color range
VideoToolbox use different identifiers for the same pixel format
with different color range, like
kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange
kCVPixelFormatType_420YpCbCr8BiPlanarFullRange.
Before the patch, vt_pool_alloc() always use limited range, and it
will fail for pixel format AV_PIX_FMT_BGRA since there is no limited
range kCVPixelFormatType_32BGRA.
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
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