1/** 2 * VP8 compatible video decoder 3 * 4 * Copyright (C) 2010 David Conrad 5 * Copyright (C) 2010 Ronald S. Bultje 6 * Copyright (C) 2010 Jason Garrett-Glaser 7 * 8 * This file is part of Libav. 9 * 10 * Libav is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * Libav is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with Libav; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25#ifndef AVCODEC_VP8_H 26#define AVCODEC_VP8_H 27 28#include "vp56.h" 29#include "vp56data.h" 30#include "vp8dsp.h" 31#include "h264pred.h" 32 33#define VP8_MAX_QUANT 127 34 35enum dct_token { 36 DCT_0, 37 DCT_1, 38 DCT_2, 39 DCT_3, 40 DCT_4, 41 DCT_CAT1, 42 DCT_CAT2, 43 DCT_CAT3, 44 DCT_CAT4, 45 DCT_CAT5, 46 DCT_CAT6, 47 DCT_EOB, 48 49 NUM_DCT_TOKENS 50}; 51 52// used to signal 4x4 intra pred in luma MBs 53#define MODE_I4x4 4 54 55enum inter_mvmode { 56 VP8_MVMODE_ZERO = MODE_I4x4 + 1, 57 VP8_MVMODE_MV, 58 VP8_MVMODE_SPLIT 59}; 60 61enum inter_splitmvmode { 62 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical) 63 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal) 64 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each 65 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each 66 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs 67}; 68 69typedef struct { 70 uint8_t filter_level; 71 uint8_t inner_limit; 72 uint8_t inner_filter; 73} VP8FilterStrength; 74 75typedef struct { 76 uint8_t skip; 77 // todo: make it possible to check for at least (i4x4 or split_mv) 78 // in one op. are others needed? 79 uint8_t mode; 80 uint8_t ref_frame; 81 uint8_t partitioning; 82 VP56mv mv; 83 VP56mv bmv[16]; 84} VP8Macroblock; 85 86typedef struct { 87 AVCodecContext *avctx; 88 AVFrame *framep[4]; 89 AVFrame *next_framep[4]; 90 uint8_t *edge_emu_buffer; 91 92 uint16_t mb_width; /* number of horizontal MB */ 93 uint16_t mb_height; /* number of vertical MB */ 94 int linesize; 95 int uvlinesize; 96 97 uint8_t keyframe; 98 uint8_t deblock_filter; 99 uint8_t mbskip_enabled; 100 uint8_t segment; ///< segment of the current macroblock 101 uint8_t chroma_pred_mode; ///< 8x8c pred mode of the current macroblock 102 uint8_t profile; 103 VP56mv mv_min; 104 VP56mv mv_max; 105 106 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type 107 int ref_count[3]; 108 109 /** 110 * Base parameters for segmentation, i.e. per-macroblock parameters. 111 * These must be kept unchanged even if segmentation is not used for 112 * a frame, since the values persist between interframes. 113 */ 114 struct { 115 uint8_t enabled; 116 uint8_t absolute_vals; 117 uint8_t update_map; 118 int8_t base_quant[4]; 119 int8_t filter_level[4]; ///< base loop filter level 120 } segmentation; 121 122 struct { 123 uint8_t simple; 124 uint8_t level; 125 uint8_t sharpness; 126 } filter; 127 128 VP8Macroblock *macroblocks; 129 VP8FilterStrength *filter_strength; 130 131 uint8_t *intra4x4_pred_mode_top; 132 uint8_t intra4x4_pred_mode_left[4]; 133 134 /** 135 * Macroblocks can have one of 4 different quants in a frame when 136 * segmentation is enabled. 137 * If segmentation is disabled, only the first segment's values are used. 138 */ 139 struct { 140 // [0] - DC qmul [1] - AC qmul 141 int16_t luma_qmul[2]; 142 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant 143 int16_t chroma_qmul[2]; 144 } qmat[4]; 145 146 struct { 147 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref 148 149 /** 150 * filter strength adjustment for the following macroblock modes: 151 * [0-3] - i16x16 (always zero) 152 * [4] - i4x4 153 * [5] - zero mv 154 * [6] - inter modes except for zero or split mv 155 * [7] - split mv 156 * i16x16 modes never have any adjustment 157 */ 158 int8_t mode[VP8_MVMODE_SPLIT+1]; 159 160 /** 161 * filter strength adjustment for macroblocks that reference: 162 * [0] - intra / VP56_FRAME_CURRENT 163 * [1] - VP56_FRAME_PREVIOUS 164 * [2] - VP56_FRAME_GOLDEN 165 * [3] - altref / VP56_FRAME_GOLDEN2 166 */ 167 int8_t ref[4]; 168 } lf_delta; 169 170 /** 171 * Cache of the top row needed for intra prediction 172 * 16 for luma, 8 for each chroma plane 173 */ 174 uint8_t (*top_border)[16+8+8]; 175 176 /** 177 * For coeff decode, we need to know whether the above block had non-zero 178 * coefficients. This means for each macroblock, we need data for 4 luma 179 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9 180 * per macroblock. We keep the last row in top_nnz. 181 */ 182 uint8_t (*top_nnz)[9]; 183 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9]; 184 185 /** 186 * This is the index plus one of the last non-zero coeff 187 * for each of the blocks in the current macroblock. 188 * So, 0 -> no coeffs 189 * 1 -> dc-only (special transform) 190 * 2+-> full transform 191 */ 192 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4]; 193 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors 194 DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16]; 195 DECLARE_ALIGNED(16, DCTELEM, block_dc)[16]; 196 uint8_t intra4x4_pred_mode_mb[16]; 197 198 /** 199 * These are all of the updatable probabilities for binary decisions. 200 * They are only implictly reset on keyframes, making it quite likely 201 * for an interframe to desync if a prior frame's header was corrupt 202 * or missing outright! 203 */ 204 struct { 205 uint8_t segmentid[3]; 206 uint8_t mbskip; 207 uint8_t intra; 208 uint8_t last; 209 uint8_t golden; 210 uint8_t pred16x16[4]; 211 uint8_t pred8x8c[3]; 212 uint8_t token[4][16][3][NUM_DCT_TOKENS-1]; 213 uint8_t mvc[2][19]; 214 } prob[2]; 215 216 VP8Macroblock *macroblocks_base; 217 int invisible; 218 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one 219 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so 220 int update_altref; 221 222 /** 223 * If this flag is not set, all the probability updates 224 * are discarded after this frame is decoded. 225 */ 226 int update_probabilities; 227 228 /** 229 * All coefficients are contained in separate arith coding contexts. 230 * There can be 1, 2, 4, or 8 of these after the header context. 231 */ 232 int num_coeff_partitions; 233 VP56RangeCoder coeff_partition[8]; 234 DSPContext dsp; 235 VP8DSPContext vp8dsp; 236 H264PredContext hpc; 237 vp8_mc_func put_pixels_tab[3][3][3]; 238 AVFrame frames[5]; 239 240 /** 241 * A list of segmentation_map buffers that are to be free()'ed in 242 * the next decoding iteration. We can't free() them right away 243 * because the map may still be used by subsequent decoding threads. 244 * Unused if frame threading is off. 245 */ 246 uint8_t *segmentation_maps[5]; 247 int num_maps_to_be_freed; 248 int maps_are_invalid; 249} VP8Context; 250 251#endif /* AVCODEC_VP8_H */ 252