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Describe all fields in xvmc struct.

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Originally committed as revision 17345 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ivan Kalvachev 2009-02-15 20:13:00 +00:00
parent d758a5cb50
commit ad0405fc03
1 changed files with 74 additions and 10 deletions
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84
libavcodec/xvmc.h
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@ -38,28 +38,92 @@ struct xvmc_pix_fmt {
Once set these values are not supposed to be modified.
*/
//@{
int xvmc_id; ///< used as a check against memory corruption by regular pixel routines or other API structures
/** The field contains special constant value.
It is used as test whenever the application knows the calling API,
and that there is no corruption caused by pixel routines.
- application - set during initialization
- libavcodec - unchanged
*/
int xvmc_id;
/** Pointer to the block array allocated by XvMCCreateBlocks()
it contins differential pixel data (in MoCo mode)
or coefficients for IDCT.
- application - set during initialization
- libavcodec - unchanged
*/
short* data_blocks;
/** Pointer to the macroblock description array allocated by XvMCCreateMacroBlocks().
- application - set during initialization
- libavcodec - unchanged
*/
XvMCMacroBlock* mv_blocks;
/** Number of all MB descriptions that could be stored in the mv_blocks array.
- application - set during initialization
- libavcodec - unchanged
*/
int total_number_of_mv_blocks;
/** Number of all blocks that could be stored at once in the data_blocks array.
- application - set during initialization
- libavcodec - unchanged
*/
int total_number_of_data_blocks;
int idct; ///< indicate that IDCT acceleration level is used
int unsigned_intra; ///< +-128 for intra pictures after clipping
XvMCSurface* p_surface; ///< pointer to rendered surface, never changed
/** Indicates that the hardware would interpret data_blocks as IDCT cefficients
and perform IDCT on them.
- application - set during initialization
- libavcodec - unchanged
*/
int idct;
/** In MoCo mode it indicates that Intra MB are assumed to be in unsigned format
Same as XVMC_INTRA_UNSIGNED flag.
- application - set during initialization
- libavcodec - unchanged
*/
int unsigned_intra;
/** Pointer to the Surface allocated by XvMCCreateSurface().
It identifies the frame on the video hardware and its state.
- application - set during initialization
- libavcodec - unchanged
*/
XvMCSurface* p_surface;
//}@
/** Set by the decoder before calling draw_horiz_band(),
needed by the XvMCRenderSurface function. */
//@{
XvMCSurface* p_past_surface; ///< pointer to the past surface
XvMCSurface* p_future_surface; ///< pointer to the future prediction surface
/** Pointer to the surface used as past reference
- application - unchanged
- libavcodec - set
*/
XvMCSurface* p_past_surface;
unsigned int picture_structure; ///< top/bottom field or frame
unsigned int flags; ///< XVMC_SECOND_FIELD - 1st or 2nd field in the sequence
/**Pointer to the surface used as future reference
- application - unchanged
- libavcodec - set
*/
XvMCSurface* p_future_surface;
/** top/bottom field or frame
- application - unchanged
- libavcodec - set
*/
unsigned int picture_structure;
/**XVMC_SECOND_FIELD - 1st or 2nd field in the sequence
- application - unchanged
- libavcodec - set
*/
unsigned int flags;
//}@
/** Offset in the mv array for the current slice:
/** Offset in the mv array for the current slice.
Macroblocks described before that offset are assumed to be already passed to the hardware.
- application - zeros it on get_buffer().
A successful draw_horiz_band() may increment it
with filled_mb_block_num or zero both.
@ -67,7 +131,7 @@ struct xvmc_pix_fmt {
*/
int start_mv_blocks_num;
/** Processed mv blocks in this slice:
/** Number of mv blocks that are filled by libavcodec and have to be passed to the hardware.
- application - zeros it on get_buffer() or after successful draw_horiz_band()
- libavcodec - increment with one of each stored MB
*/