设置 CMSampleBuffer 示例附件 (Swift)

Question

我正在尝试为 CMSampleBuffer 中的每个示例设置 kCMSampleAttachmentKey_DisplayImmediately。

到目前为止，我已经尝试获取字典（Dictionary<NSObject, AnyObject>、NSDictionary、CFDictionary），并在 CMSampleBuffer 及其附件上调用了 CMSetAttachment .

我使用 CMSampleBufferGetSampleAttachmentsArray.

来检索附件

知道如何在 Swift 中设置这些标志吗？

Answer 1

这是适用于 Swift 4（应该适用于 3）的解决方案（可能远非完美）。

func setSampleBufferAttachments(_ sampleBuffer: CMSampleBuffer) {
    let attachments: CFArray! = CMSampleBufferGetSampleAttachmentsArray(sampleBuffer, true)
    let dictionary = unsafeBitCast(CFArrayGetValueAtIndex(attachments, 0),
        to: CFMutableDictionary.self)
    let key = Unmanaged.passUnretained(kCMSampleAttachmentKey_DisplayImmediately).toOpaque()
    let value = Unmanaged.passUnretained(kCFBooleanTrue).toOpaque()
    CFDictionarySetValue(dictionary, key, value)
}

设置 CMSampleBuffer 示例附件 (Swift)

Set CMSampleBuffer samples attachment (Swift)

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