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 FFmpeg.
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.
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.
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
29 #include "libavutil/buffer.h"
38 #include "compat/os2threads.h"
40 #include "compat/w32pthreads.h"
43 #define VP8_MAX_QUANT 127
62 // used to signal 4x4 intra pred in luma MBs
66 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
71 enum inter_splitmvmode {
72 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
73 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
74 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
75 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
76 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
79 typedef struct VP8FilterStrength {
85 typedef struct VP8Macroblock {
87 // todo: make it possible to check for at least (i4x4 or split_mv)
88 // in one op. are others needed?
92 uint8_t chroma_pred_mode;
94 uint8_t intra4x4_pred_mode_mb[16];
95 uint8_t intra4x4_pred_mode_top[4];
100 typedef struct VP8ThreadData {
101 DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
102 DECLARE_ALIGNED(16, int16_t, block_dc)[16];
104 * This is the index plus one of the last non-zero coeff
105 * for each of the blocks in the current macroblock.
107 * 1 -> dc-only (special transform)
108 * 2+-> full transform
110 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
112 * For coeff decode, we need to know whether the above block had non-zero
113 * coefficients. This means for each macroblock, we need data for 4 luma
114 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
115 * per macroblock. We keep the last row in top_nnz.
117 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
120 pthread_mutex_t lock;
123 int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
124 int wait_mb_pos; // What the current thread is waiting on.
126 #define EDGE_EMU_LINESIZE 32
127 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];
128 VP8FilterStrength *filter_strength;
131 typedef struct VP8Frame {
133 AVBufferRef *seg_map;
136 #define MAX_THREADS 8
137 typedef struct VP8Context {
138 VP8ThreadData *thread_data;
139 AVCodecContext *avctx;
141 VP8Frame *next_framep[4];
143 VP8Frame *prev_frame;
145 uint16_t mb_width; /* number of horizontal MB */
146 uint16_t mb_height; /* number of vertical MB */
151 uint8_t deblock_filter;
152 uint8_t mbskip_enabled;
157 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
161 * Base parameters for segmentation, i.e. per-macroblock parameters.
162 * These must be kept unchanged even if segmentation is not used for
163 * a frame, since the values persist between interframes.
167 uint8_t absolute_vals;
169 int8_t base_quant[4];
170 int8_t filter_level[4]; ///< base loop filter level
179 VP8Macroblock *macroblocks;
181 uint8_t *intra4x4_pred_mode_top;
182 uint8_t intra4x4_pred_mode_left[4];
185 * Macroblocks can have one of 4 different quants in a frame when
186 * segmentation is enabled.
187 * If segmentation is disabled, only the first segment's values are used.
190 // [0] - DC qmul [1] - AC qmul
191 int16_t luma_qmul[2];
192 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
193 int16_t chroma_qmul[2];
197 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
200 * filter strength adjustment for the following macroblock modes:
201 * [0-3] - i16x16 (always zero)
204 * [6] - inter modes except for zero or split mv
206 * i16x16 modes never have any adjustment
208 int8_t mode[VP8_MVMODE_SPLIT+1];
211 * filter strength adjustment for macroblocks that reference:
212 * [0] - intra / VP56_FRAME_CURRENT
213 * [1] - VP56_FRAME_PREVIOUS
214 * [2] - VP56_FRAME_GOLDEN
215 * [3] - altref / VP56_FRAME_GOLDEN2
220 uint8_t (*top_border)[16+8+8];
221 uint8_t (*top_nnz)[9];
223 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
226 * These are all of the updatable probabilities for binary decisions.
227 * They are only implictly reset on keyframes, making it quite likely
228 * for an interframe to desync if a prior frame's header was corrupt
229 * or missing outright!
232 uint8_t segmentid[3];
237 uint8_t pred16x16[4];
239 uint8_t token[4][16][3][NUM_DCT_TOKENS-1];
243 VP8Macroblock *macroblocks_base;
245 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
246 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
250 * If this flag is not set, all the probability updates
251 * are discarded after this frame is decoded.
253 int update_probabilities;
256 * All coefficients are contained in separate arith coding contexts.
257 * There can be 1, 2, 4, or 8 of these after the header context.
259 int num_coeff_partitions;
260 VP56RangeCoder coeff_partition[8];
261 VideoDSPContext vdsp;
262 VP8DSPContext vp8dsp;
264 vp8_mc_func put_pixels_tab[3][3][3];
269 * This describes the macroblock memory layout.
270 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
271 * 1 -> Macroblocks for entire frame alloced (sliced thread).
276 int ff_vp8_decode_init(AVCodecContext *avctx);
278 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
281 int ff_vp8_decode_free(AVCodecContext *avctx);
283 #endif /* AVCODEC_VP8_H */