FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vp56.h
Date: 2026-01-14 03:33:33
Exec Total Coverage
Lines: 14 14 100.0%
Functions: 3 3 100.0%
Branches: 6 6 100.0%
Line Branch Exec Source
1 /*
2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * VP5 and VP6 compatible video decoder (common features)
24 */
25
26 #ifndef AVCODEC_VP56_H
27 #define AVCODEC_VP56_H
28
29 #include "libavutil/mem_internal.h"
30
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "hpeldsp.h"
34 #include "h264chroma.h"
35 #include "videodsp.h"
36 #include "vp3dsp.h"
37 #include "vp56dsp.h"
38 #include "vpx_rac.h"
39
40 typedef struct vp56_context VP56Context;
41
42 typedef enum {
43 VP56_FRAME_NONE =-1,
44 VP56_FRAME_CURRENT = 0,
45 VP56_FRAME_PREVIOUS = 1,
46 VP56_FRAME_GOLDEN = 2,
47 } VP56Frame;
48
49 typedef enum {
50 VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
51 VP56_MB_INTRA = 1, /**< Intra MB */
52 VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
53 VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
54 VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
55 VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
56 VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
57 VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
58 VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
59 VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
60 } VP56mb;
61
62 typedef struct VP56Tree {
63 int8_t val;
64 int8_t prob_idx;
65 } VP56Tree;
66
67 typedef struct VP56mv {
68 DECLARE_ALIGNED(4, int16_t, x);
69 int16_t y;
70 } VP56mv;
71
72 #define VP56_SIZE_CHANGE 1
73
74 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
75 VP56mv *vect);
76 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
77 int offset1, int offset2, ptrdiff_t stride,
78 VP56mv mv, int mask, int select, int luma);
79 typedef int (*VP56ParseCoeff)(VP56Context *s);
80 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
81 typedef void (*VP56ParseVectorModels)(VP56Context *s);
82 typedef int (*VP56ParseCoeffModels)(VP56Context *s);
83 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
84 int buf_size);
85
86 typedef struct VP56RefDc {
87 uint8_t not_null_dc;
88 VP56Frame ref_frame;
89 int16_t dc_coeff;
90 } VP56RefDc;
91
92 typedef struct VP56Macroblock {
93 uint8_t type;
94 VP56mv mv;
95 } VP56Macroblock;
96
97 typedef struct VP56Model {
98 uint8_t coeff_reorder[64]; /* used in vp6 only */
99 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
100 uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
101 uint8_t vector_sig[2]; /* delta sign */
102 uint8_t vector_dct[2]; /* delta coding types */
103 uint8_t vector_pdi[2][2]; /* predefined delta init */
104 uint8_t vector_pdv[2][7]; /* predefined delta values */
105 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
106 uint8_t coeff_dccv[2][11]; /* DC coeff value */
107 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
108 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
109 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
110 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
111 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
112 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
113 } VP56Model;
114
115 struct vp56_context {
116 AVCodecContext *avctx;
117 H264ChromaContext h264chroma;
118 HpelDSPContext hdsp;
119 VideoDSPContext vdsp;
120 VP3DSPContext vp3dsp;
121 union {
122 VP5DSPContext vp5dsp;
123 VP6DSPContext vp6dsp;
124 };
125 uint8_t idct_scantable[64];
126 AVFrame *frames[4];
127 uint8_t *edge_emu_buffer_alloc;
128 uint8_t *edge_emu_buffer;
129 VPXRangeCoder c;
130 VPXRangeCoder cc;
131 VPXRangeCoder *ccp;
132 int sub_version;
133
134 /* frame info */
135 int golden_frame;
136 int plane_width[4];
137 int plane_height[4];
138 int mb_width; /* number of horizontal MB */
139 int mb_height; /* number of vertical MB */
140 int block_offset[6];
141
142 int quantizer;
143 uint16_t dequant_dc;
144 uint16_t dequant_ac;
145
146 /* DC predictors management */
147 VP56RefDc *above_blocks;
148 VP56RefDc left_block[4];
149 int above_block_idx[6];
150 int16_t prev_dc[3][3]; /* [plan][ref_frame] */
151
152 /* blocks / macroblock */
153 VP56mb mb_type;
154 VP56Macroblock *macroblocks;
155 DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
156 int idct_selector[6];
157 const uint8_t *def_coeff_reorder;/* used in vp6 only */
158
159 /* motion vectors */
160 VP56mv mv[6]; /* vectors for each block in MB */
161 VP56mv vector_candidate[2];
162 int vector_candidate_pos;
163
164 /* filtering hints */
165 int filter_header; /* used in vp6 only */
166 int deblock_filtering;
167 int filter_selection;
168 int filter_mode;
169 int max_vector_length;
170 int sample_variance_threshold;
171 DECLARE_ALIGNED(8, int, bounding_values_array)[256];
172
173 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
174 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
175
176 int has_alpha;
177
178 /* interlacing params */
179 int interlaced;
180 int il_prob;
181 int il_block;
182
183 /* upside-down flipping hints */
184 int flip; /* are we flipping ? */
185 int frbi; /* first row block index in MB */
186 int srbi; /* second row block index in MB */
187 ptrdiff_t stride[4]; /* stride for each plan */
188
189 const uint8_t *vp56_coord_div;
190 VP56ParseVectorAdjustment parse_vector_adjustment;
191 VP56Filter filter;
192 VP56ParseCoeff parse_coeff;
193 VP56DefaultModelsInit default_models_init;
194 VP56ParseVectorModels parse_vector_models;
195 VP56ParseCoeffModels parse_coeff_models;
196 VP56ParseHeader parse_header;
197
198 /* for "slice" parallelism between YUV and A */
199 VP56Context *alpha_context;
200
201 VP56Model *modelp;
202 VP56Model model;
203
204 /* huffman decoding */
205 int use_huffman;
206 GetBitContext gb;
207 VLC dccv_vlc[2];
208 VLC runv_vlc[2];
209 VLC ract_vlc[2][3][4];
210 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
211
212 int have_undamaged_frame;
213 int discard_frame;
214 };
215
216
217 /**
218 * Initializes an VP56Context. Expects its caller to clean up
219 * in case of error.
220 */
221 int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
222 int flip, int has_alpha);
223 int ff_vp56_free_context(VP56Context *s);
224 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
225 int ff_vp56_decode_frame(AVCodecContext *avctx, AVFrame *frame,
226 int *got_frame, AVPacket *avpkt);
227
228
229 /**
230 * vp56 specific range coder implementation
231 */
232
233 71445 static int vp56_rac_gets(VPXRangeCoder *c, int bits)
234 {
235 71445 int value = 0;
236
237
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 298873 while (bits--) {
238 227428 value = (value << 1) | vpx_rac_get(c);
239 }
240
241 71445 return value;
242 }
243
244 // P(7)
245 9295 av_unused static int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
246 {
247 9295 int v = vp56_rac_gets(c, 7) << 1;
248 9295 return v + !v;
249 }
250
251 static av_always_inline
252 533099 int vp56_rac_get_tree(VPXRangeCoder *c,
253 const VP56Tree *tree,
254 const uint8_t *probs)
255 {
256
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 2104384 while (tree->val > 0) {
257
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 1571285 if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
258 506737 tree += tree->val;
259 else
260 1064548 tree++;
261 }
262 533099 return -tree->val;
263 }
264
265 #endif /* AVCODEC_VP56_H */
266