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4349 | Serge | 1 | /* |
2 | * H.264 HW decode acceleration through VA API |
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3 | * |
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4 | * Copyright (C) 2008-2009 Splitted-Desktop Systems |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | #include "vaapi_internal.h" |
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24 | #include "h264.h" |
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25 | |||
26 | /** |
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27 | * @file |
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28 | * This file implements the glue code between FFmpeg's and VA API's |
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29 | * structures for H.264 decoding. |
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30 | */ |
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31 | |||
32 | /** |
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33 | * Initialize an empty VA API picture. |
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34 | * |
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35 | * VA API requires a fixed-size reference picture array. |
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36 | */ |
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37 | static void init_vaapi_pic(VAPictureH264 *va_pic) |
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38 | { |
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39 | va_pic->picture_id = VA_INVALID_ID; |
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40 | va_pic->flags = VA_PICTURE_H264_INVALID; |
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41 | va_pic->TopFieldOrderCnt = 0; |
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42 | va_pic->BottomFieldOrderCnt = 0; |
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43 | } |
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44 | |||
45 | /** |
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46 | * Translate an FFmpeg Picture into its VA API form. |
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47 | * |
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48 | * @param[out] va_pic A pointer to VA API's own picture struct |
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49 | * @param[in] pic A pointer to the FFmpeg picture struct to convert |
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50 | * @param[in] pic_structure The picture field type (as defined in mpegvideo.h), |
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51 | * supersedes pic's field type if nonzero. |
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52 | */ |
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53 | static void fill_vaapi_pic(VAPictureH264 *va_pic, |
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54 | Picture *pic, |
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55 | int pic_structure) |
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56 | { |
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57 | if (pic_structure == 0) |
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58 | pic_structure = pic->reference; |
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59 | pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */ |
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60 | |||
61 | va_pic->picture_id = ff_vaapi_get_surface_id(pic); |
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62 | va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num; |
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63 | |||
64 | va_pic->flags = 0; |
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65 | if (pic_structure != PICT_FRAME) |
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66 | va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD; |
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67 | if (pic->reference) |
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68 | va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE; |
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69 | |||
70 | va_pic->TopFieldOrderCnt = 0; |
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71 | if (pic->field_poc[0] != INT_MAX) |
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72 | va_pic->TopFieldOrderCnt = pic->field_poc[0]; |
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73 | |||
74 | va_pic->BottomFieldOrderCnt = 0; |
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75 | if (pic->field_poc[1] != INT_MAX) |
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76 | va_pic->BottomFieldOrderCnt = pic->field_poc[1]; |
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77 | } |
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78 | |||
79 | /** Decoded Picture Buffer (DPB). */ |
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80 | typedef struct DPB { |
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81 | int size; ///< Current number of reference frames in the DPB |
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82 | int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames) |
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83 | VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array |
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84 | } DPB; |
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85 | |||
86 | /** |
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87 | * Append picture to the decoded picture buffer, in a VA API form that |
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88 | * merges the second field picture attributes with the first, if |
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89 | * available. The decoded picture buffer's size must be large enough |
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90 | * to receive the new VA API picture object. |
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91 | */ |
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92 | static int dpb_add(DPB *dpb, Picture *pic) |
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93 | { |
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94 | int i; |
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95 | |||
96 | if (dpb->size >= dpb->max_size) |
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97 | return -1; |
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98 | |||
99 | for (i = 0; i < dpb->size; i++) { |
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100 | VAPictureH264 * const va_pic = &dpb->va_pics[i]; |
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101 | if (va_pic->picture_id == ff_vaapi_get_surface_id(pic)) { |
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102 | VAPictureH264 temp_va_pic; |
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103 | fill_vaapi_pic(&temp_va_pic, pic, 0); |
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104 | |||
105 | if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) { |
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106 | va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD); |
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107 | /* Merge second field */ |
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108 | if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) { |
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109 | va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt; |
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110 | } else { |
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111 | va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt; |
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112 | } |
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113 | } |
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114 | return 0; |
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115 | } |
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116 | } |
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117 | |||
118 | fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0); |
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119 | return 0; |
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120 | } |
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121 | |||
122 | /** Fill in VA API reference frames array. */ |
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123 | static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param, |
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124 | H264Context *h) |
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125 | { |
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126 | DPB dpb; |
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127 | int i; |
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128 | |||
129 | dpb.size = 0; |
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130 | dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames); |
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131 | dpb.va_pics = pic_param->ReferenceFrames; |
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132 | for (i = 0; i < dpb.max_size; i++) |
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133 | init_vaapi_pic(&dpb.va_pics[i]); |
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134 | |||
135 | for (i = 0; i < h->short_ref_count; i++) { |
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136 | Picture * const pic = h->short_ref[i]; |
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137 | if (pic && pic->reference && dpb_add(&dpb, pic) < 0) |
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138 | return -1; |
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139 | } |
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140 | |||
141 | for (i = 0; i < 16; i++) { |
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142 | Picture * const pic = h->long_ref[i]; |
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143 | if (pic && pic->reference && dpb_add(&dpb, pic) < 0) |
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144 | return -1; |
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145 | } |
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146 | return 0; |
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147 | } |
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148 | |||
149 | /** |
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150 | * Fill in VA API reference picture lists from the FFmpeg reference |
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151 | * picture list. |
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152 | * |
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153 | * @param[out] RefPicList VA API internal reference picture list |
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154 | * @param[in] ref_list A pointer to the FFmpeg reference list |
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155 | * @param[in] ref_count The number of reference pictures in ref_list |
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156 | */ |
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157 | static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32], |
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158 | Picture *ref_list, |
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159 | unsigned int ref_count) |
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160 | { |
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161 | unsigned int i, n = 0; |
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162 | for (i = 0; i < ref_count; i++) |
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163 | if (ref_list[i].reference) |
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164 | fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0); |
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165 | |||
166 | for (; n < 32; n++) |
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167 | init_vaapi_pic(&RefPicList[n]); |
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168 | } |
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169 | |||
170 | /** |
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171 | * Fill in prediction weight table. |
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172 | * |
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173 | * VA API requires a plain prediction weight table as it does not infer |
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174 | * any value. |
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175 | * |
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176 | * @param[in] h A pointer to the current H.264 context |
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177 | * @param[in] list The reference frame list index to use |
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178 | * @param[out] luma_weight_flag VA API plain luma weight flag |
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179 | * @param[out] luma_weight VA API plain luma weight table |
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180 | * @param[out] luma_offset VA API plain luma offset table |
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181 | * @param[out] chroma_weight_flag VA API plain chroma weight flag |
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182 | * @param[out] chroma_weight VA API plain chroma weight table |
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183 | * @param[out] chroma_offset VA API plain chroma offset table |
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184 | */ |
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185 | static void fill_vaapi_plain_pred_weight_table(H264Context *h, |
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186 | int list, |
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187 | unsigned char *luma_weight_flag, |
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188 | short luma_weight[32], |
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189 | short luma_offset[32], |
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190 | unsigned char *chroma_weight_flag, |
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191 | short chroma_weight[32][2], |
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192 | short chroma_offset[32][2]) |
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193 | { |
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194 | unsigned int i, j; |
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195 | |||
196 | *luma_weight_flag = h->luma_weight_flag[list]; |
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197 | *chroma_weight_flag = h->chroma_weight_flag[list]; |
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198 | |||
199 | for (i = 0; i < h->ref_count[list]; i++) { |
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200 | /* VA API also wants the inferred (default) values, not |
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201 | only what is available in the bitstream (7.4.3.2). */ |
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202 | if (h->luma_weight_flag[list]) { |
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203 | luma_weight[i] = h->luma_weight[i][list][0]; |
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204 | luma_offset[i] = h->luma_weight[i][list][1]; |
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205 | } else { |
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206 | luma_weight[i] = 1 << h->luma_log2_weight_denom; |
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207 | luma_offset[i] = 0; |
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208 | } |
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209 | for (j = 0; j < 2; j++) { |
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210 | if (h->chroma_weight_flag[list]) { |
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211 | chroma_weight[i][j] = h->chroma_weight[i][list][j][0]; |
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212 | chroma_offset[i][j] = h->chroma_weight[i][list][j][1]; |
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213 | } else { |
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214 | chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom; |
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215 | chroma_offset[i][j] = 0; |
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216 | } |
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217 | } |
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218 | } |
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219 | } |
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220 | |||
221 | /** Initialize and start decoding a frame with VA API. */ |
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222 | static int vaapi_h264_start_frame(AVCodecContext *avctx, |
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223 | av_unused const uint8_t *buffer, |
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224 | av_unused uint32_t size) |
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225 | { |
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226 | H264Context * const h = avctx->priv_data; |
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227 | struct vaapi_context * const vactx = avctx->hwaccel_context; |
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228 | VAPictureParameterBufferH264 *pic_param; |
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229 | VAIQMatrixBufferH264 *iq_matrix; |
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230 | |||
231 | av_dlog(avctx, "vaapi_h264_start_frame()\n"); |
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232 | |||
233 | vactx->slice_param_size = sizeof(VASliceParameterBufferH264); |
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234 | |||
235 | /* Fill in VAPictureParameterBufferH264. */ |
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236 | pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264)); |
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237 | if (!pic_param) |
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238 | return -1; |
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239 | fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure); |
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240 | if (fill_vaapi_ReferenceFrames(pic_param, h) < 0) |
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241 | return -1; |
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242 | pic_param->picture_width_in_mbs_minus1 = h->mb_width - 1; |
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243 | pic_param->picture_height_in_mbs_minus1 = h->mb_height - 1; |
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244 | pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8; |
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245 | pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8; |
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246 | pic_param->num_ref_frames = h->sps.ref_frame_count; |
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247 | pic_param->seq_fields.value = 0; /* reset all bits */ |
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248 | pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc; |
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249 | pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */ |
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250 | pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag; |
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251 | pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag; |
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252 | pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff; |
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253 | pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag; |
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254 | pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */ |
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255 | pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4; |
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256 | pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type; |
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257 | pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4; |
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258 | pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag; |
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259 | pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1; |
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260 | pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type; |
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261 | pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */ |
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262 | pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26; |
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263 | pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26; |
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264 | pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0]; |
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265 | pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1]; |
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266 | pic_param->pic_fields.value = 0; /* reset all bits */ |
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267 | pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac; |
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268 | pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred; |
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269 | pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc; |
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270 | pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode; |
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271 | pic_param->pic_fields.bits.field_pic_flag = h->picture_structure != PICT_FRAME; |
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272 | pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred; |
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273 | pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present; |
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274 | pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present; |
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275 | pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present; |
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276 | pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0; |
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277 | pic_param->frame_num = h->frame_num; |
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278 | |||
279 | /* Fill in VAIQMatrixBufferH264. */ |
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280 | iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264)); |
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281 | if (!iq_matrix) |
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282 | return -1; |
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283 | memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4)); |
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284 | memcpy(iq_matrix->ScalingList8x8[0], h->pps.scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0])); |
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285 | memcpy(iq_matrix->ScalingList8x8[1], h->pps.scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0])); |
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286 | return 0; |
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287 | } |
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288 | |||
289 | /** End a hardware decoding based frame. */ |
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290 | static int vaapi_h264_end_frame(AVCodecContext *avctx) |
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291 | { |
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292 | struct vaapi_context * const vactx = avctx->hwaccel_context; |
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293 | H264Context * const h = avctx->priv_data; |
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294 | int ret; |
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295 | |||
296 | av_dlog(avctx, "vaapi_h264_end_frame()\n"); |
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297 | ret = ff_vaapi_commit_slices(vactx); |
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298 | if (ret < 0) |
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299 | goto finish; |
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300 | |||
301 | ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->cur_pic_ptr)); |
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302 | if (ret < 0) |
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303 | goto finish; |
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304 | |||
305 | ff_h264_draw_horiz_band(h, 0, h->avctx->height); |
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306 | |||
307 | finish: |
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308 | ff_vaapi_common_end_frame(avctx); |
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309 | return ret; |
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310 | } |
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311 | |||
312 | /** Decode the given H.264 slice with VA API. */ |
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313 | static int vaapi_h264_decode_slice(AVCodecContext *avctx, |
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314 | const uint8_t *buffer, |
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315 | uint32_t size) |
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316 | { |
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317 | H264Context * const h = avctx->priv_data; |
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318 | VASliceParameterBufferH264 *slice_param; |
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319 | |||
320 | av_dlog(avctx, "vaapi_h264_decode_slice(): buffer %p, size %d\n", |
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321 | buffer, size); |
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322 | |||
323 | /* Fill in VASliceParameterBufferH264. */ |
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324 | slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); |
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325 | if (!slice_param) |
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326 | return -1; |
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327 | slice_param->slice_data_bit_offset = get_bits_count(&h->gb) + 8; /* bit buffer started beyond nal_unit_type */ |
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328 | slice_param->first_mb_in_slice = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x; |
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329 | slice_param->slice_type = ff_h264_get_slice_type(h); |
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330 | slice_param->direct_spatial_mv_pred_flag = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0; |
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331 | slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0; |
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332 | slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0; |
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333 | slice_param->cabac_init_idc = h->cabac_init_idc; |
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334 | slice_param->slice_qp_delta = h->qscale - h->pps.init_qp; |
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335 | slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter; |
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336 | slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26; |
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337 | slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26; |
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338 | slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom; |
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339 | slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom; |
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340 | |||
341 | fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0); |
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342 | fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->ref_count[1] : 0); |
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343 | |||
344 | fill_vaapi_plain_pred_weight_table(h, 0, |
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345 | &slice_param->luma_weight_l0_flag, slice_param->luma_weight_l0, slice_param->luma_offset_l0, |
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346 | &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0); |
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347 | fill_vaapi_plain_pred_weight_table(h, 1, |
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348 | &slice_param->luma_weight_l1_flag, slice_param->luma_weight_l1, slice_param->luma_offset_l1, |
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349 | &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1); |
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350 | return 0; |
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351 | } |
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352 | |||
353 | AVHWAccel ff_h264_vaapi_hwaccel = { |
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354 | .name = "h264_vaapi", |
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355 | .type = AVMEDIA_TYPE_VIDEO, |
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356 | .id = AV_CODEC_ID_H264, |
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357 | .pix_fmt = AV_PIX_FMT_VAAPI_VLD, |
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358 | .start_frame = vaapi_h264_start_frame, |
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359 | .end_frame = vaapi_h264_end_frame, |
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360 | .decode_slice = vaapi_h264_decode_slice, |
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361 | };>>>>><>>><>>>>>>>>>>>>> |