2 * VP8 compatible video decoder
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
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"
39 # include "compat/w32pthreads.h"
42 #define VP8_MAX_QUANT 127
61 // used to signal 4x4 intra pred in luma MBs
65 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
70 enum inter_splitmvmode {
71 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
72 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
73 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
74 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
75 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
78 typedef struct VP8FilterStrength {
84 typedef struct VP8Macroblock {
86 // TODO: make it possible to check for at least (i4x4 or split_mv)
87 // in one op. are others needed?
91 uint8_t chroma_pred_mode;
93 uint8_t intra4x4_pred_mode_mb[16];
94 DECLARE_ALIGNED(4, uint8_t, intra4x4_pred_mode_top)[4];
99 typedef struct VP8ThreadData {
100 DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
101 DECLARE_ALIGNED(16, int16_t, block_dc)[16];
103 * This is the index plus one of the last non-zero coeff
104 * for each of the blocks in the current macroblock.
106 * 1 -> dc-only (special transform)
107 * 2+-> full transform
109 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
111 * For coeff decode, we need to know whether the above block had non-zero
112 * coefficients. This means for each macroblock, we need data for 4 luma
113 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
114 * per macroblock. We keep the last row in top_nnz.
116 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
119 pthread_mutex_t lock;
122 int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
123 int wait_mb_pos; // What the current thread is waiting on.
125 #define EDGE_EMU_LINESIZE 32
126 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];
127 VP8FilterStrength *filter_strength;
130 typedef struct VP8Frame {
132 AVBufferRef *seg_map;
134 AVBufferRef *hwaccel_priv_buf;
135 void *hwaccel_picture_private;
138 #define MAX_THREADS 8
139 typedef struct VP8Context {
140 VP8ThreadData *thread_data;
141 AVCodecContext *avctx;
142 enum AVPixelFormat pix_fmt;
145 VP8Frame *next_framep[4];
147 VP8Frame *prev_frame;
149 uint16_t mb_width; /* number of horizontal MB */
150 uint16_t mb_height; /* number of vertical MB */
152 ptrdiff_t uvlinesize;
155 uint8_t deblock_filter;
156 uint8_t mbskip_enabled;
161 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
165 * Base parameters for segmentation, i.e. per-macroblock parameters.
166 * These must be kept unchanged even if segmentation is not used for
167 * a frame, since the values persist between interframes.
171 uint8_t absolute_vals;
173 uint8_t update_feature_data;
174 int8_t base_quant[4];
175 int8_t filter_level[4]; ///< base loop filter level
184 VP8Macroblock *macroblocks;
186 uint8_t *intra4x4_pred_mode_top;
187 uint8_t intra4x4_pred_mode_left[4];
190 * Macroblocks can have one of 4 different quants in a frame when
191 * segmentation is enabled.
192 * If segmentation is disabled, only the first segment's values are used.
195 // [0] - DC qmul [1] - AC qmul
196 int16_t luma_qmul[2];
197 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
198 int16_t chroma_qmul[2];
201 // Raw quantisation values, which may be needed by hwaccel decode.
212 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
216 * filter strength adjustment for the following macroblock modes:
217 * [0-3] - i16x16 (always zero)
220 * [6] - inter modes except for zero or split mv
222 * i16x16 modes never have any adjustment
224 int8_t mode[VP8_MVMODE_SPLIT + 1];
227 * filter strength adjustment for macroblocks that reference:
228 * [0] - intra / VP56_FRAME_CURRENT
229 * [1] - VP56_FRAME_PREVIOUS
230 * [2] - VP56_FRAME_GOLDEN
231 * [3] - altref / VP56_FRAME_GOLDEN2
236 uint8_t (*top_border)[16 + 8 + 8];
237 uint8_t (*top_nnz)[9];
239 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
241 /* This contains the entropy coder state at the end of the header
242 * block, in the form specified by the standard. For use by
243 * hwaccels, so that a hardware decoder has the information to
244 * start decoding at the macroblock layer.
247 const uint8_t *input;
251 } coder_state_at_header_end;
253 int header_partition_size;
256 * These are all of the updatable probabilities for binary decisions.
257 * They are only implicitly reset on keyframes, making it quite likely
258 * for an interframe to desync if a prior frame's header was corrupt
259 * or missing outright!
262 uint8_t segmentid[3];
267 uint8_t pred16x16[4];
269 uint8_t token[4][16][3][NUM_DCT_TOKENS - 1];
274 VP8Macroblock *macroblocks_base;
276 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
277 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
281 * If this flag is not set, all the probability updates
282 * are discarded after this frame is decoded.
284 int update_probabilities;
287 * All coefficients are contained in separate arith coding contexts.
288 * There can be 1, 2, 4, or 8 of these after the header context.
290 int num_coeff_partitions;
291 VP56RangeCoder coeff_partition[8];
292 int coeff_partition_size[8];
293 VideoDSPContext vdsp;
294 VP8DSPContext vp8dsp;
296 vp8_mc_func put_pixels_tab[3][3][3];
299 uint8_t colorspace; ///< 0 is the only value allowed (meaning bt601)
300 uint8_t fullrange; ///< whether we can skip clamping in dsp functions
304 * This describes the macroblock memory layout.
305 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
306 * 1 -> Macroblocks for entire frame allocated (sliced thread).
311 * Fade bit present in bitstream (VP7)
316 * Interframe DC prediction (VP7)
317 * [0] VP56_FRAME_PREVIOUS
318 * [1] VP56_FRAME_GOLDEN
320 uint16_t inter_dc_pred[2][2];
323 * Macroblock features (VP7)
325 uint8_t feature_enabled[4];
326 uint8_t feature_present_prob[4];
327 uint8_t feature_index_prob[4][3];
328 uint8_t feature_value[4][4];
331 int ff_vp8_decode_init(AVCodecContext *avctx);
333 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
336 int ff_vp8_decode_free(AVCodecContext *avctx);
338 #endif /* AVCODEC_VP8_H */