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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
41enum 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
61enum inter_mvmode {
62 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
63 VP8_MVMODE_MV,
64 VP8_MVMODE_SPLIT
65};
66
67enum 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
75typedef struct VP8FilterStrength {
76 uint8_t filter_level;
77 uint8_t inner_limit;
78 uint8_t inner_filter;
79} VP8FilterStrength;
80
81typedef 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
96typedef struct VP8intmv {
97 int x;
98 int y;
99} VP8intmv;
100
101typedef struct VP8mvbounds {
102 VP8intmv mv_min;
103 VP8intmv mv_max;
104} VP8mvbounds;
105
106typedef 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
138typedef struct VP8Frame {
139 ThreadFrame tf;
140 AVBufferRef *seg_map;
141} VP8Frame;
142
143#define MAX_THREADS 8
144typedef struct VP8Context {
145 VP8ThreadData *thread_data;
146 AVCodecContext *avctx;
147 VP8Frame *framep[4];
148 VP8Frame *next_framep[4];
149 VP8Frame *curframe;
150 VP8Frame *prev_frame;
151
152 uint16_t mb_width; /* number of horizontal MB */
153 uint16_t mb_height; /* number of vertical MB */
154 ptrdiff_t linesize;
155 ptrdiff_t uvlinesize;
156
157 uint8_t keyframe;
158 uint8_t deblock_filter;
159 uint8_t mbskip_enabled;
160 uint8_t profile;
161 VP8mvbounds mv_bounds;
162
163 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
164 int ref_count[3];
165
166 /**
167 * Base parameters for segmentation, i.e. per-macroblock parameters.
168 * These must be kept unchanged even if segmentation is not used for
169 * a frame, since the values persist between interframes.
170 */
171 struct {
172 uint8_t enabled;
173 uint8_t absolute_vals;
174 uint8_t update_map;
175 int8_t base_quant[4];
176 int8_t filter_level[4]; ///< base loop filter level
177 } segmentation;
178
179 struct {
180 uint8_t simple;
181 uint8_t level;
182 uint8_t sharpness;
183 } filter;
184
185 VP8Macroblock *macroblocks;
186
187 uint8_t *intra4x4_pred_mode_top;
188 uint8_t intra4x4_pred_mode_left[4];
189
190 /**
191 * Macroblocks can have one of 4 different quants in a frame when
192 * segmentation is enabled.
193 * If segmentation is disabled, only the first segment's values are used.
194 */
195 struct {
196 // [0] - DC qmul [1] - AC qmul
197 int16_t luma_qmul[2];
198 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
199 int16_t chroma_qmul[2];
200 } qmat[4];
201
202 struct {
203 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
204
205 /**
206 * filter strength adjustment for the following macroblock modes:
207 * [0-3] - i16x16 (always zero)
208 * [4] - i4x4
209 * [5] - zero mv
210 * [6] - inter modes except for zero or split mv
211 * [7] - split mv
212 * i16x16 modes never have any adjustment
213 */
214 int8_t mode[VP8_MVMODE_SPLIT + 1];
215
216 /**
217 * filter strength adjustment for macroblocks that reference:
218 * [0] - intra / VP56_FRAME_CURRENT
219 * [1] - VP56_FRAME_PREVIOUS
220 * [2] - VP56_FRAME_GOLDEN
221 * [3] - altref / VP56_FRAME_GOLDEN2
222 */
223 int8_t ref[4];
224 } lf_delta;
225
226 uint8_t (*top_border)[16 + 8 + 8];
227 uint8_t (*top_nnz)[9];
228
229 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
230
231 /**
232 * These are all of the updatable probabilities for binary decisions.
233 * They are only implicitly reset on keyframes, making it quite likely
234 * for an interframe to desync if a prior frame's header was corrupt
235 * or missing outright!
236 */
237 struct {
238 uint8_t segmentid[3];
239 uint8_t mbskip;
240 uint8_t intra;
241 uint8_t last;
242 uint8_t golden;
243 uint8_t pred16x16[4];
244 uint8_t pred8x8c[3];
245 uint8_t token[4][16][3][NUM_DCT_TOKENS - 1];
246 uint8_t mvc[2][19];
247 uint8_t scan[16];
248 } prob[2];
249
250 VP8Macroblock *macroblocks_base;
251 int invisible;
252 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
253 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
254 int update_altref;
255
256 /**
257 * If this flag is not set, all the probability updates
258 * are discarded after this frame is decoded.
259 */
260 int update_probabilities;
261
262 /**
263 * All coefficients are contained in separate arith coding contexts.
264 * There can be 1, 2, 4, or 8 of these after the header context.
265 */
266 int num_coeff_partitions;
267 VP56RangeCoder coeff_partition[8];
268 VideoDSPContext vdsp;
269 VP8DSPContext vp8dsp;
270 H264PredContext hpc;
271 vp8_mc_func put_pixels_tab[3][3][3];
272 VP8Frame frames[5];
273
274 uint8_t colorspace; ///< 0 is the only value allowed (meaning bt601)
275 uint8_t fullrange; ///< whether we can skip clamping in dsp functions
276
277 int num_jobs;
278 /**
279 * This describes the macroblock memory layout.
280 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
281 * 1 -> Macroblocks for entire frame allocated (sliced thread).
282 */
283 int mb_layout;
284
285 int (*decode_mb_row_no_filter)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
286 void (*filter_mb_row)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
287
288 int vp7;
289
290 /**
291 * Fade bit present in bitstream (VP7)
292 */
293 int fade_present;
294
295 /**
296 * Interframe DC prediction (VP7)
297 * [0] VP56_FRAME_PREVIOUS
298 * [1] VP56_FRAME_GOLDEN
299 */
300 uint16_t inter_dc_pred[2][2];
301
302 /**
303 * Macroblock features (VP7)
304 */
305 uint8_t feature_enabled[4];
306 uint8_t feature_present_prob[4];
307 uint8_t feature_index_prob[4][3];
308 uint8_t feature_value[4][4];
309} VP8Context;
310
311int ff_vp8_decode_init(AVCodecContext *avctx);
312
313int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
314 AVPacket *avpkt);
315
316int ff_vp8_decode_free(AVCodecContext *avctx);
317
318#endif /* AVCODEC_VP8_H */
319
generated by cgit at 2024-05-17 06:09:49 (GMT)