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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 Libav. |
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5 * |
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6 * Libav 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 * Libav 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 Libav; 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 */ |