Copy data to or from a hw surface. At least one of dst/src must have an
AVHWFramesContext attached.
If src has an AVHWFramesContext attached, then the format of dst (if set)
must use one of the formats returned by av_hwframe_transfer_get_formats(src,
AV_HWFRAME_TRANSFER_DIRECTION_FROM).
If dst has an AVHWFramesContext attached, then the format of src must use one
of the formats returned by av_hwframe_transfer_get_formats(dst,
AV_HWFRAME_TRANSFER_DIRECTION_TO)
dst may be "clean" (i.e. with data/buf pointers unset), in which case the
data buffers will be allocated by this function using av_frame_get_buffer().
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
@return 0 on success, a negative AVERROR error code on failure.
Copy data to or from a hw surface. At least one of dst/src must have an AVHWFramesContext attached.
If src has an AVHWFramesContext attached, then the format of dst (if set) must use one of the formats returned by av_hwframe_transfer_get_formats(src, AV_HWFRAME_TRANSFER_DIRECTION_FROM). If dst has an AVHWFramesContext attached, then the format of src must use one of the formats returned by av_hwframe_transfer_get_formats(dst, AV_HWFRAME_TRANSFER_DIRECTION_TO)
dst may be "clean" (i.e. with data/buf pointers unset), in which case the data buffers will be allocated by this function using av_frame_get_buffer(). 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 @return 0 on success, a negative AVERROR error code on failure.