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  1. /*
  2.  * Copyright (C) 2003 Ivan Kalvachev
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVCODEC_XVMC_H
  22. #define AVCODEC_XVMC_H
  23.  
  24. /**
  25.  * @file
  26.  * @ingroup lavc_codec_hwaccel_xvmc
  27.  * Public libavcodec XvMC header.
  28.  */
  29.  
  30. #include <X11/extensions/XvMC.h>
  31.  
  32. #include "avcodec.h"
  33.  
  34. /**
  35.  * @defgroup lavc_codec_hwaccel_xvmc XvMC
  36.  * @ingroup lavc_codec_hwaccel
  37.  *
  38.  * @{
  39.  */
  40.  
  41. #define AV_XVMC_ID                    0x1DC711C0  /**< special value to ensure that regular pixel routines haven't corrupted the struct
  42.                                                        the number is 1337 speak for the letters IDCT MCo (motion compensation) */
  43.  
  44. struct xvmc_pix_fmt {
  45.     /** The field contains the special constant value AV_XVMC_ID.
  46.         It is used as a test that the application correctly uses the API,
  47.         and that there is no corruption caused by pixel routines.
  48.         - application - set during initialization
  49.         - libavcodec  - unchanged
  50.     */
  51.     int             xvmc_id;
  52.  
  53.     /** Pointer to the block array allocated by XvMCCreateBlocks().
  54.         The array has to be freed by XvMCDestroyBlocks().
  55.         Each group of 64 values represents one data block of differential
  56.         pixel information (in MoCo mode) or coefficients for IDCT.
  57.         - application - set the pointer during initialization
  58.         - libavcodec  - fills coefficients/pixel data into the array
  59.     */
  60.     short*          data_blocks;
  61.  
  62.     /** Pointer to the macroblock description array allocated by
  63.         XvMCCreateMacroBlocks() and freed by XvMCDestroyMacroBlocks().
  64.         - application - set the pointer during initialization
  65.         - libavcodec  - fills description data into the array
  66.     */
  67.     XvMCMacroBlock* mv_blocks;
  68.  
  69.     /** Number of macroblock descriptions that can be stored in the mv_blocks
  70.         array.
  71.         - application - set during initialization
  72.         - libavcodec  - unchanged
  73.     */
  74.     int             allocated_mv_blocks;
  75.  
  76.     /** Number of blocks that can be stored at once in the data_blocks array.
  77.         - application - set during initialization
  78.         - libavcodec  - unchanged
  79.     */
  80.     int             allocated_data_blocks;
  81.  
  82.     /** Indicate that the hardware would interpret data_blocks as IDCT
  83.         coefficients and perform IDCT on them.
  84.         - application - set during initialization
  85.         - libavcodec  - unchanged
  86.     */
  87.     int             idct;
  88.  
  89.     /** In MoCo mode it indicates that intra macroblocks are assumed to be in
  90.         unsigned format; same as the XVMC_INTRA_UNSIGNED flag.
  91.         - application - set during initialization
  92.         - libavcodec  - unchanged
  93.     */
  94.     int             unsigned_intra;
  95.  
  96.     /** Pointer to the surface allocated by XvMCCreateSurface().
  97.         It has to be freed by XvMCDestroySurface() on application exit.
  98.         It identifies the frame and its state on the video hardware.
  99.         - application - set during initialization
  100.         - libavcodec  - unchanged
  101.     */
  102.     XvMCSurface*    p_surface;
  103.  
  104. /** Set by the decoder before calling ff_draw_horiz_band(),
  105.     needed by the XvMCRenderSurface function. */
  106. //@{
  107.     /** Pointer to the surface used as past reference
  108.         - application - unchanged
  109.         - libavcodec  - set
  110.     */
  111.     XvMCSurface*    p_past_surface;
  112.  
  113.     /** Pointer to the surface used as future reference
  114.         - application - unchanged
  115.         - libavcodec  - set
  116.     */
  117.     XvMCSurface*    p_future_surface;
  118.  
  119.     /** top/bottom field or frame
  120.         - application - unchanged
  121.         - libavcodec  - set
  122.     */
  123.     unsigned int    picture_structure;
  124.  
  125.     /** XVMC_SECOND_FIELD - 1st or 2nd field in the sequence
  126.         - application - unchanged
  127.         - libavcodec  - set
  128.     */
  129.     unsigned int    flags;
  130. //}@
  131.  
  132.     /** Number of macroblock descriptions in the mv_blocks array
  133.         that have already been passed to the hardware.
  134.         - application - zeroes it on get_buffer().
  135.                         A successful ff_draw_horiz_band() may increment it
  136.                         with filled_mb_block_num or zero both.
  137.         - libavcodec  - unchanged
  138.     */
  139.     int             start_mv_blocks_num;
  140.  
  141.     /** Number of new macroblock descriptions in the mv_blocks array (after
  142.         start_mv_blocks_num) that are filled by libavcodec and have to be
  143.         passed to the hardware.
  144.         - application - zeroes it on get_buffer() or after successful
  145.                         ff_draw_horiz_band().
  146.         - libavcodec  - increment with one of each stored MB
  147.     */
  148.     int             filled_mv_blocks_num;
  149.  
  150.     /** Number of the next free data block; one data block consists of
  151.         64 short values in the data_blocks array.
  152.         All blocks before this one have already been claimed by placing their
  153.         position into the corresponding block description structure field,
  154.         that are part of the mv_blocks array.
  155.         - application - zeroes it on get_buffer().
  156.                         A successful ff_draw_horiz_band() may zero it together
  157.                         with start_mb_blocks_num.
  158.         - libavcodec  - each decoded macroblock increases it by the number
  159.                         of coded blocks it contains.
  160.     */
  161.     int             next_free_data_block_num;
  162. };
  163.  
  164. /**
  165.  * @}
  166.  */
  167.  
  168. #endif /* AVCODEC_XVMC_H */
  169.