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2134
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1 /*
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2 * Copyright (C) 2003 Ivan Kalvachev
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVCODEC_XVMC_H
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22 #define AVCODEC_XVMC_H
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23
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24 /**
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25 * @file
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26 * @ingroup lavc_codec_hwaccel_xvmc
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27 * Public libavcodec XvMC header.
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28 */
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29
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30 #include <X11/extensions/XvMC.h>
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31
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32 #include "avcodec.h"
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33
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34 /**
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35 * @defgroup lavc_codec_hwaccel_xvmc XvMC
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36 * @ingroup lavc_codec_hwaccel
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37 *
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38 * @{
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39 */
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40
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41 #define AV_XVMC_ID 0x1DC711C0 /**< special value to ensure that regular pixel routines haven't corrupted the struct
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42 the number is 1337 speak for the letters IDCT MCo (motion compensation) */
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43
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44 struct xvmc_pix_fmt {
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45 /** The field contains the special constant value AV_XVMC_ID.
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46 It is used as a test that the application correctly uses the API,
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47 and that there is no corruption caused by pixel routines.
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48 - application - set during initialization
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49 - libavcodec - unchanged
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50 */
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51 int xvmc_id;
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52
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53 /** Pointer to the block array allocated by XvMCCreateBlocks().
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54 The array has to be freed by XvMCDestroyBlocks().
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55 Each group of 64 values represents one data block of differential
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56 pixel information (in MoCo mode) or coefficients for IDCT.
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57 - application - set the pointer during initialization
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58 - libavcodec - fills coefficients/pixel data into the array
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59 */
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60 short* data_blocks;
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61
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62 /** Pointer to the macroblock description array allocated by
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63 XvMCCreateMacroBlocks() and freed by XvMCDestroyMacroBlocks().
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64 - application - set the pointer during initialization
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65 - libavcodec - fills description data into the array
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66 */
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67 XvMCMacroBlock* mv_blocks;
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68
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69 /** Number of macroblock descriptions that can be stored in the mv_blocks
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70 array.
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71 - application - set during initialization
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72 - libavcodec - unchanged
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73 */
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74 int allocated_mv_blocks;
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75
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76 /** Number of blocks that can be stored at once in the data_blocks array.
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77 - application - set during initialization
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78 - libavcodec - unchanged
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79 */
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80 int allocated_data_blocks;
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81
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82 /** Indicate that the hardware would interpret data_blocks as IDCT
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83 coefficients and perform IDCT on them.
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84 - application - set during initialization
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85 - libavcodec - unchanged
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86 */
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87 int idct;
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88
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89 /** In MoCo mode it indicates that intra macroblocks are assumed to be in
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90 unsigned format; same as the XVMC_INTRA_UNSIGNED flag.
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91 - application - set during initialization
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92 - libavcodec - unchanged
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93 */
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94 int unsigned_intra;
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95
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96 /** Pointer to the surface allocated by XvMCCreateSurface().
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97 It has to be freed by XvMCDestroySurface() on application exit.
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98 It identifies the frame and its state on the video hardware.
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99 - application - set during initialization
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100 - libavcodec - unchanged
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101 */
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102 XvMCSurface* p_surface;
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103
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104 /** Set by the decoder before calling ff_draw_horiz_band(),
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105 needed by the XvMCRenderSurface function. */
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106 //@{
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107 /** Pointer to the surface used as past reference
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108 - application - unchanged
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109 - libavcodec - set
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110 */
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111 XvMCSurface* p_past_surface;
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112
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113 /** Pointer to the surface used as future reference
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114 - application - unchanged
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115 - libavcodec - set
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116 */
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117 XvMCSurface* p_future_surface;
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118
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119 /** top/bottom field or frame
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120 - application - unchanged
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121 - libavcodec - set
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122 */
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123 unsigned int picture_structure;
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124
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125 /** XVMC_SECOND_FIELD - 1st or 2nd field in the sequence
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126 - application - unchanged
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127 - libavcodec - set
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128 */
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129 unsigned int flags;
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130 //}@
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131
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132 /** Number of macroblock descriptions in the mv_blocks array
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133 that have already been passed to the hardware.
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134 - application - zeroes it on get_buffer().
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135 A successful ff_draw_horiz_band() may increment it
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136 with filled_mb_block_num or zero both.
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137 - libavcodec - unchanged
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138 */
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139 int start_mv_blocks_num;
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140
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141 /** Number of new macroblock descriptions in the mv_blocks array (after
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142 start_mv_blocks_num) that are filled by libavcodec and have to be
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143 passed to the hardware.
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144 - application - zeroes it on get_buffer() or after successful
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145 ff_draw_horiz_band().
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146 - libavcodec - increment with one of each stored MB
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147 */
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148 int filled_mv_blocks_num;
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149
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150 /** Number of the next free data block; one data block consists of
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151 64 short values in the data_blocks array.
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152 All blocks before this one have already been claimed by placing their
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153 position into the corresponding block description structure field,
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154 that are part of the mv_blocks array.
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155 - application - zeroes it on get_buffer().
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156 A successful ff_draw_horiz_band() may zero it together
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157 with start_mb_blocks_num.
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158 - libavcodec - each decoded macroblock increases it by the number
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159 of coded blocks it contains.
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160 */
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161 int next_free_data_block_num;
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162 };
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163
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164 /**
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165 * @}
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166 */
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167
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168 #endif /* AVCODEC_XVMC_H */
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