MediaPlayerLibVLCVideoFormatCb 委托 |
Callback prototype to configure picture buffers format.
This callback gets the format of the video as output by the video decoder
and the chain of video filters (if any). It can opt to change any parameter
as it needs. In that case, LibVLC will attempt to convert the video format
(rescaling and chroma conversion) but these operations can be CPU intensive.
命名空间： LibVLCSharp.Shared
程序集： CPF.Vlc (在 CPF.Vlc.dll 中) 版本：0.8.8.5
语法public delegate uint LibVLCVideoFormatCb( ref IntPtr opaque, IntPtr chroma, ref uint width, ref uint height, ref uint pitches, ref uint lines )
参数
- opaque
- 类型：SystemIntPtr
pointer to the private pointer passed to
libvlc_video_set_callbacks() [IN/OUT]
- chroma
- 类型：SystemIntPtr
pointer to the 4 bytes video format identifier [IN/OUT] - width
- 类型：SystemUInt32
pointer to the pixel width [IN/OUT] - height
- 类型：SystemUInt32
pointer to the pixel height [IN/OUT] - pitches
- 类型：SystemUInt32
table of scanline pitches in bytes for each pixel plane
(the table is allocated by LibVLC) [OUT]
- lines
- 类型：SystemUInt32
table of scanlines count for each plane [OUT]
返回值
类型：UInt32the number of picture buffers allocated, 0 indicates failure
备注For each pixels plane, the scanline pitch must be bigger than or equal to
the number of bytes per pixel multiplied by the pixel width.
Similarly, the number of scanlines must be bigger than of equal to
the pixel height.
Furthermore, we recommend that pitches and lines be multiple of 32
to not break assumptions that might be held by optimized code
in the video decoders, video filters and/or video converters.
参见