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hwcontext: clarify the behaviour of transfer_data() for cropped frames

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Anton Khirnov 2016-06-25 14:48:47 +02:00
parent 94ebf55658
commit 5fcae3b3f9
1 changed files with 8 additions and 0 deletions
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8
libavutil/hwcontext.h
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@ -318,6 +318,14 @@ int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags);
* If dst->format is set, then this format will be used, otherwise (when
* dst->format is AV_PIX_FMT_NONE) the first acceptable format will be chosen.
*
* The two frames must have matching allocated dimensions (i.e. equal to
* AVHWFramesContext.width/height), since not all device types support
* transferring a sub-rectangle of the whole surface. The display dimensions
* (i.e. AVFrame.width/height) may be smaller than the allocated dimensions, but
* also have to be equal for both frames. When the display dimensions are
* smaller than the allocated dimensions, the content of the padding in the
* destination frame is unspecified.
*
* @param dst the destination frame. dst is not touched on failure.
* @param src the source frame.
* @param flags currently unused, should be set to zero