1 /* 2 * VP8 compatible video decoder 3 * 4 * Copyright (C) 2010 David Conrad 5 * Copyright (C) 2010 Ronald S. Bultje 6 * Copyright (C) 2010 Fiona Glaser 7 * Copyright (C) 2012 Daniel Kang 8 * 9 * This file is part of FFmpeg. 10 * 11 * FFmpeg is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU Lesser General Public 13 * License as published by the Free Software Foundation; either 14 * version 2.1 of the License, or (at your option) any later version. 15 * 16 * FFmpeg is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * Lesser General Public License for more details. 20 * 21 * You should have received a copy of the GNU Lesser General Public 22 * License along with FFmpeg; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 24 */ 25 26 #ifndef AVCODEC_VP8_H 27 #define AVCODEC_VP8_H 28 29 #include <stdatomic.h> 30 31 #include "libavutil/buffer.h" 32 #include "libavutil/thread.h" 33 34 #include "h264pred.h" 35 #include "thread.h" 36 #include "vp56.h" 37 #include "vp8dsp.h" 38 39 #define VP8_MAX_QUANT 127 40 41 enum dct_token { 42 DCT_0, 43 DCT_1, 44 DCT_2, 45 DCT_3, 46 DCT_4, 47 DCT_CAT1, 48 DCT_CAT2, 49 DCT_CAT3, 50 DCT_CAT4, 51 DCT_CAT5, 52 DCT_CAT6, 53 DCT_EOB, 54 55 NUM_DCT_TOKENS 56 }; 57 58 // used to signal 4x4 intra pred in luma MBs 59 #define MODE_I4x4 4 60 61 enum inter_mvmode { 62 VP8_MVMODE_ZERO = MODE_I4x4 + 1, 63 VP8_MVMODE_MV, 64 VP8_MVMODE_SPLIT 65 }; 66 67 enum inter_splitmvmode { 68 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical) 69 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal) 70 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each 71 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each 72 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs 73 }; 74 75 typedef struct VP8FilterStrength { 76 uint8_t filter_level; 77 uint8_t inner_limit; 78 uint8_t inner_filter; 79 } VP8FilterStrength; 80 81 typedef struct VP8Macroblock { 82 uint8_t skip; 83 // TODO: make it possible to check for at least (i4x4 or split_mv) 84 // in one op. are others needed? 85 uint8_t mode; 86 uint8_t ref_frame; 87 uint8_t partitioning; 88 uint8_t chroma_pred_mode; 89 uint8_t segment; 90 uint8_t intra4x4_pred_mode_mb[16]; 91 DECLARE_ALIGNED(4, uint8_t, intra4x4_pred_mode_top)[4]; 92 VP56mv mv; 93 VP56mv bmv[16]; 94 } VP8Macroblock; 95 96 typedef struct VP8intmv { 97 int x; 98 int y; 99 } VP8intmv; 100 101 typedef struct VP8mvbounds { 102 VP8intmv mv_min; 103 VP8intmv mv_max; 104 } VP8mvbounds; 105 106 typedef struct VP8ThreadData { 107 DECLARE_ALIGNED(16, int16_t, block)[6][4][16]; 108 DECLARE_ALIGNED(16, int16_t, block_dc)[16]; 109 /** 110 * This is the index plus one of the last non-zero coeff 111 * for each of the blocks in the current macroblock. 112 * So, 0 -> no coeffs 113 * 1 -> dc-only (special transform) 114 * 2+-> full transform 115 */ 116 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4]; 117 /** 118 * For coeff decode, we need to know whether the above block had non-zero 119 * coefficients. This means for each macroblock, we need data for 4 luma 120 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9 121 * per macroblock. We keep the last row in top_nnz. 122 */ 123 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9]; 124 int thread_nr; 125 #if HAVE_THREADS 126 pthread_mutex_t lock; 127 pthread_cond_t cond; 128 #endif 129 atomic_int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF) 130 atomic_int wait_mb_pos; // What the current thread is waiting on. 131 132 #define EDGE_EMU_LINESIZE 32 133 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE]; 134 VP8FilterStrength *filter_strength; 135 VP8mvbounds mv_bounds; 136 } VP8ThreadData; 137 138 typedef struct VP8Frame { 139 ThreadFrame tf; 140 AVBufferRef *seg_map; 141 142 AVBufferRef *hwaccel_priv_buf; 143 void *hwaccel_picture_private; 144 } VP8Frame; 145 146 #define MAX_THREADS 8 147 typedef struct VP8Context { 148 VP8ThreadData *thread_data; 149 AVCodecContext *avctx; 150 enum AVPixelFormat pix_fmt; 151 int actually_webp; 152 153 VP8Frame *framep[4]; 154 VP8Frame *next_framep[4]; 155 VP8Frame *curframe; 156 VP8Frame *prev_frame; 157 158 uint16_t mb_width; /* number of horizontal MB */ 159 uint16_t mb_height; /* number of vertical MB */ 160 ptrdiff_t linesize; 161 ptrdiff_t uvlinesize; 162 163 uint8_t keyframe; 164 uint8_t deblock_filter; 165 uint8_t mbskip_enabled; 166 uint8_t profile; 167 VP8mvbounds mv_bounds; 168 169 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type 170 int ref_count[3]; 171 172 /** 173 * Base parameters for segmentation, i.e. per-macroblock parameters. 174 * These must be kept unchanged even if segmentation is not used for 175 * a frame, since the values persist between interframes. 176 */ 177 struct { 178 uint8_t enabled; 179 uint8_t absolute_vals; 180 uint8_t update_map; 181 uint8_t update_feature_data; 182 int8_t base_quant[4]; 183 int8_t filter_level[4]; ///< base loop filter level 184 } segmentation; 185 186 struct { 187 uint8_t simple; 188 uint8_t level; 189 uint8_t sharpness; 190 } filter; 191 192 VP8Macroblock *macroblocks; 193 194 uint8_t *intra4x4_pred_mode_top; 195 uint8_t intra4x4_pred_mode_left[4]; 196 197 /** 198 * Macroblocks can have one of 4 different quants in a frame when 199 * segmentation is enabled. 200 * If segmentation is disabled, only the first segment's values are used. 201 */ 202 struct { 203 // [0] - DC qmul [1] - AC qmul 204 int16_t luma_qmul[2]; 205 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant 206 int16_t chroma_qmul[2]; 207 } qmat[4]; 208 209 // Raw quantisation values, which may be needed by hwaccel decode. 210 struct { 211 int yac_qi; 212 int ydc_delta; 213 int y2dc_delta; 214 int y2ac_delta; 215 int uvdc_delta; 216 int uvac_delta; 217 } quant; 218 219 struct { 220 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref 221 uint8_t update; 222 223 /** 224 * filter strength adjustment for the following macroblock modes: 225 * [0-3] - i16x16 (always zero) 226 * [4] - i4x4 227 * [5] - zero mv 228 * [6] - inter modes except for zero or split mv 229 * [7] - split mv 230 * i16x16 modes never have any adjustment 231 */ 232 int8_t mode[VP8_MVMODE_SPLIT + 1]; 233 234 /** 235 * filter strength adjustment for macroblocks that reference: 236 * [0] - intra / VP56_FRAME_CURRENT 237 * [1] - VP56_FRAME_PREVIOUS 238 * [2] - VP56_FRAME_GOLDEN 239 * [3] - altref / VP56_FRAME_GOLDEN2 240 */ 241 int8_t ref[4]; 242 } lf_delta; 243 244 uint8_t (*top_border)[16 + 8 + 8]; 245 uint8_t (*top_nnz)[9]; 246 247 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors 248 249 /* This contains the entropy coder state at the end of the header 250 * block, in the form specified by the standard. For use by 251 * hwaccels, so that a hardware decoder has the information to 252 * start decoding at the macroblock layer. 253 */ 254 struct { 255 const uint8_t *input; 256 uint32_t range; 257 uint32_t value; 258 int bit_count; 259 } coder_state_at_header_end; 260 261 int header_partition_size; 262 263 /** 264 * These are all of the updatable probabilities for binary decisions. 265 * They are only implicitly reset on keyframes, making it quite likely 266 * for an interframe to desync if a prior frame's header was corrupt 267 * or missing outright! 268 */ 269 struct { 270 uint8_t segmentid[3]; 271 uint8_t mbskip; 272 uint8_t intra; 273 uint8_t last; 274 uint8_t golden; 275 uint8_t pred16x16[4]; 276 uint8_t pred8x8c[3]; 277 uint8_t token[4][16][3][NUM_DCT_TOKENS - 1]; 278 uint8_t mvc[2][19]; 279 uint8_t scan[16]; 280 } prob[2]; 281 282 VP8Macroblock *macroblocks_base; 283 int invisible; 284 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one 285 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so 286 int update_altref; 287 288 /** 289 * If this flag is not set, all the probability updates 290 * are discarded after this frame is decoded. 291 */ 292 int update_probabilities; 293 294 /** 295 * All coefficients are contained in separate arith coding contexts. 296 * There can be 1, 2, 4, or 8 of these after the header context. 297 */ 298 int num_coeff_partitions; 299 VP56RangeCoder coeff_partition[8]; 300 int coeff_partition_size[8]; 301 VideoDSPContext vdsp; 302 VP8DSPContext vp8dsp; 303 H264PredContext hpc; 304 vp8_mc_func put_pixels_tab[3][3][3]; 305 VP8Frame frames[5]; 306 307 uint8_t colorspace; ///< 0 is the only value allowed (meaning bt601) 308 uint8_t fullrange; ///< whether we can skip clamping in dsp functions 309 310 int num_jobs; 311 /** 312 * This describes the macroblock memory layout. 313 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread). 314 * 1 -> Macroblocks for entire frame allocated (sliced thread). 315 */ 316 int mb_layout; 317 318 int (*decode_mb_row_no_filter)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr); 319 void (*filter_mb_row)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr); 320 321 int vp7; 322 323 /** 324 * Fade bit present in bitstream (VP7) 325 */ 326 int fade_present; 327 328 /** 329 * Interframe DC prediction (VP7) 330 * [0] VP56_FRAME_PREVIOUS 331 * [1] VP56_FRAME_GOLDEN 332 */ 333 uint16_t inter_dc_pred[2][2]; 334 335 /** 336 * Macroblock features (VP7) 337 */ 338 uint8_t feature_enabled[4]; 339 uint8_t feature_present_prob[4]; 340 uint8_t feature_index_prob[4][3]; 341 uint8_t feature_value[4][4]; 342 } VP8Context; 343 344 int ff_vp8_decode_init(AVCodecContext *avctx); 345 346 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, 347 AVPacket *avpkt); 348 349 int ff_vp8_decode_free(AVCodecContext *avctx); 350 351 #endif /* AVCODEC_VP8_H */ 352