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
8 * This file is part of FFmpeg.
10 * FFmpeg 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.
15 * FFmpeg 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.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
33 #define VP8_MAX_QUANT 127
52 // used to signal 4x4 intra pred in luma MBs
56 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
61 enum 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
77 // todo: make it possible to check for at least (i4x4 or split_mv)
78 // in one op. are others needed?
87 AVCodecContext *avctx;
89 AVFrame *next_framep[4];
90 uint8_t *edge_emu_buffer;
92 uint16_t mb_width; /* number of horizontal MB */
93 uint16_t mb_height; /* number of vertical MB */
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
106 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
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.
116 uint8_t absolute_vals;
118 int8_t base_quant[4];
119 int8_t filter_level[4]; ///< base loop filter level
128 VP8Macroblock *macroblocks;
129 VP8FilterStrength *filter_strength;
131 uint8_t *intra4x4_pred_mode_top;
132 uint8_t intra4x4_pred_mode_left[4];
133 uint8_t *segmentation_map;
136 * Macroblocks can have one of 4 different quants in a frame when
137 * segmentation is enabled.
138 * If segmentation is disabled, only the first segment's values are used.
141 // [0] - DC qmul [1] - AC qmul
142 int16_t luma_qmul[2];
143 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
144 int16_t chroma_qmul[2];
148 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
151 * filter strength adjustment for the following macroblock modes:
152 * [0-3] - i16x16 (always zero)
155 * [6] - inter modes except for zero or split mv
157 * i16x16 modes never have any adjustment
159 int8_t mode[VP8_MVMODE_SPLIT+1];
162 * filter strength adjustment for macroblocks that reference:
163 * [0] - intra / VP56_FRAME_CURRENT
164 * [1] - VP56_FRAME_PREVIOUS
165 * [2] - VP56_FRAME_GOLDEN
166 * [3] - altref / VP56_FRAME_GOLDEN2
172 * Cache of the top row needed for intra prediction
173 * 16 for luma, 8 for each chroma plane
175 uint8_t (*top_border)[16+8+8];
178 * For coeff decode, we need to know whether the above block had non-zero
179 * coefficients. This means for each macroblock, we need data for 4 luma
180 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
181 * per macroblock. We keep the last row in top_nnz.
183 uint8_t (*top_nnz)[9];
184 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
187 * This is the index plus one of the last non-zero coeff
188 * for each of the blocks in the current macroblock.
190 * 1 -> dc-only (special transform)
191 * 2+-> full transform
193 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
194 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
195 DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
196 DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
197 uint8_t intra4x4_pred_mode_mb[16];
200 * These are all of the updatable probabilities for binary decisions.
201 * They are only implictly reset on keyframes, making it quite likely
202 * for an interframe to desync if a prior frame's header was corrupt
203 * or missing outright!
206 uint8_t segmentid[3];
211 uint8_t pred16x16[4];
213 uint8_t token[4][16][3][NUM_DCT_TOKENS-1];
217 VP8Macroblock *macroblocks_base;
219 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
220 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
224 * If this flag is not set, all the probability updates
225 * are discarded after this frame is decoded.
227 int update_probabilities;
230 * All coefficients are contained in separate arith coding contexts.
231 * There can be 1, 2, 4, or 8 of these after the header context.
233 int num_coeff_partitions;
234 VP56RangeCoder coeff_partition[8];
236 VP8DSPContext vp8dsp;
238 vp8_mc_func put_pixels_tab[3][3][3];
242 #endif /* AVCODEC_VP8_H */