2 * VP8 compatible video decoder
4 * Copyright (C) 2010 David Conrad
5 * Copyright (C) 2010 Ronald S. Bultje
6 * Copyright (C) 2010 Jason Garrett-Glaser
7 * Copyright (C) 2012 Daniel Kang
9 * This file is part of Libav.
11 * Libav 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.
16 * Libav 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.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with Libav; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/buffer.h"
38 #include "compat/w32pthreads.h"
41 #define VP8_MAX_QUANT 127
60 // used to signal 4x4 intra pred in luma MBs
64 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
69 enum inter_splitmvmode {
70 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
71 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
72 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
73 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
74 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
77 typedef struct VP8FilterStrength {
83 typedef struct VP8Macroblock {
85 // todo: make it possible to check for at least (i4x4 or split_mv)
86 // in one op. are others needed?
90 uint8_t chroma_pred_mode;
92 uint8_t intra4x4_pred_mode_mb[16];
93 uint8_t intra4x4_pred_mode_top[4];
98 typedef struct VP8ThreadData {
99 DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
100 DECLARE_ALIGNED(16, int16_t, block_dc)[16];
102 * This is the index plus one of the last non-zero coeff
103 * for each of the blocks in the current macroblock.
105 * 1 -> dc-only (special transform)
106 * 2+-> full transform
108 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
110 * For coeff decode, we need to know whether the above block had non-zero
111 * coefficients. This means for each macroblock, we need data for 4 luma
112 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
113 * per macroblock. We keep the last row in top_nnz.
115 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
118 pthread_mutex_t lock;
121 int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
122 int wait_mb_pos; // What the current thread is waiting on.
124 #define EDGE_EMU_LINESIZE 32
125 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];
126 VP8FilterStrength *filter_strength;
129 typedef struct VP8Frame {
131 AVBufferRef *seg_map;
134 #define MAX_THREADS 8
135 typedef struct VP8Context {
136 VP8ThreadData *thread_data;
137 AVCodecContext *avctx;
139 VP8Frame *next_framep[4];
141 VP8Frame *prev_frame;
143 uint16_t mb_width; /* number of horizontal MB */
144 uint16_t mb_height; /* number of vertical MB */
149 uint8_t deblock_filter;
150 uint8_t mbskip_enabled;
155 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
159 * Base parameters for segmentation, i.e. per-macroblock parameters.
160 * These must be kept unchanged even if segmentation is not used for
161 * a frame, since the values persist between interframes.
165 uint8_t absolute_vals;
167 int8_t base_quant[4];
168 int8_t filter_level[4]; ///< base loop filter level
177 VP8Macroblock *macroblocks;
179 uint8_t *intra4x4_pred_mode_top;
180 uint8_t intra4x4_pred_mode_left[4];
183 * Macroblocks can have one of 4 different quants in a frame when
184 * segmentation is enabled.
185 * If segmentation is disabled, only the first segment's values are used.
188 // [0] - DC qmul [1] - AC qmul
189 int16_t luma_qmul[2];
190 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
191 int16_t chroma_qmul[2];
195 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
198 * filter strength adjustment for the following macroblock modes:
199 * [0-3] - i16x16 (always zero)
202 * [6] - inter modes except for zero or split mv
204 * i16x16 modes never have any adjustment
206 int8_t mode[VP8_MVMODE_SPLIT+1];
209 * filter strength adjustment for macroblocks that reference:
210 * [0] - intra / VP56_FRAME_CURRENT
211 * [1] - VP56_FRAME_PREVIOUS
212 * [2] - VP56_FRAME_GOLDEN
213 * [3] - altref / VP56_FRAME_GOLDEN2
218 uint8_t (*top_border)[16+8+8];
219 uint8_t (*top_nnz)[9];
221 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
224 * These are all of the updatable probabilities for binary decisions.
225 * They are only implictly reset on keyframes, making it quite likely
226 * for an interframe to desync if a prior frame's header was corrupt
227 * or missing outright!
230 uint8_t segmentid[3];
235 uint8_t pred16x16[4];
237 uint8_t token[4][16][3][NUM_DCT_TOKENS-1];
241 VP8Macroblock *macroblocks_base;
243 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
244 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
248 * If this flag is not set, all the probability updates
249 * are discarded after this frame is decoded.
251 int update_probabilities;
254 * All coefficients are contained in separate arith coding contexts.
255 * There can be 1, 2, 4, or 8 of these after the header context.
257 int num_coeff_partitions;
258 VP56RangeCoder coeff_partition[8];
259 VideoDSPContext vdsp;
260 VP8DSPContext vp8dsp;
262 vp8_mc_func put_pixels_tab[3][3][3];
267 * This describes the macroblock memory layout.
268 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
269 * 1 -> Macroblocks for entire frame alloced (sliced thread).
274 int ff_vp8_decode_init(AVCodecContext *avctx);
276 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
279 int ff_vp8_decode_free(AVCodecContext *avctx);
281 #endif /* AVCODEC_VP8_H */