FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vp56.h
Date: 2025-07-28 20:30:09
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 VP56DSPContext vp56dsp;
122 uint8_t idct_scantable[64];
123 AVFrame *frames[4];
124 uint8_t *edge_emu_buffer_alloc;
125 uint8_t *edge_emu_buffer;
126 VPXRangeCoder c;
127 VPXRangeCoder cc;
128 VPXRangeCoder *ccp;
129 int sub_version;
130
131 /* frame info */
132 int golden_frame;
133 int plane_width[4];
134 int plane_height[4];
135 int mb_width; /* number of horizontal MB */
136 int mb_height; /* number of vertical MB */
137 int block_offset[6];
138
139 int quantizer;
140 uint16_t dequant_dc;
141 uint16_t dequant_ac;
142
143 /* DC predictors management */
144 VP56RefDc *above_blocks;
145 VP56RefDc left_block[4];
146 int above_block_idx[6];
147 int16_t prev_dc[3][3]; /* [plan][ref_frame] */
148
149 /* blocks / macroblock */
150 VP56mb mb_type;
151 VP56Macroblock *macroblocks;
152 DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
153 int idct_selector[6];
154 const uint8_t *def_coeff_reorder;/* used in vp6 only */
155
156 /* motion vectors */
157 VP56mv mv[6]; /* vectors for each block in MB */
158 VP56mv vector_candidate[2];
159 int vector_candidate_pos;
160
161 /* filtering hints */
162 int filter_header; /* used in vp6 only */
163 int deblock_filtering;
164 int filter_selection;
165 int filter_mode;
166 int max_vector_length;
167 int sample_variance_threshold;
168 DECLARE_ALIGNED(8, int, bounding_values_array)[256];
169
170 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
171 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
172
173 int has_alpha;
174
175 /* interlacing params */
176 int interlaced;
177 int il_prob;
178 int il_block;
179
180 /* upside-down flipping hints */
181 int flip; /* are we flipping ? */
182 int frbi; /* first row block index in MB */
183 int srbi; /* second row block index in MB */
184 ptrdiff_t stride[4]; /* stride for each plan */
185
186 const uint8_t *vp56_coord_div;
187 VP56ParseVectorAdjustment parse_vector_adjustment;
188 VP56Filter filter;
189 VP56ParseCoeff parse_coeff;
190 VP56DefaultModelsInit default_models_init;
191 VP56ParseVectorModels parse_vector_models;
192 VP56ParseCoeffModels parse_coeff_models;
193 VP56ParseHeader parse_header;
194
195 /* for "slice" parallelism between YUV and A */
196 VP56Context *alpha_context;
197
198 VP56Model *modelp;
199 VP56Model model;
200
201 /* huffman decoding */
202 int use_huffman;
203 GetBitContext gb;
204 VLC dccv_vlc[2];
205 VLC runv_vlc[2];
206 VLC ract_vlc[2][3][4];
207 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
208
209 int have_undamaged_frame;
210 int discard_frame;
211 };
212
213
214 /**
215 * Initializes an VP56Context. Expects its caller to clean up
216 * in case of error.
217 */
218 int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
219 int flip, int has_alpha);
220 int ff_vp56_free_context(VP56Context *s);
221 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
222 int ff_vp56_decode_frame(AVCodecContext *avctx, AVFrame *frame,
223 int *got_frame, AVPacket *avpkt);
224
225
226 /**
227 * vp56 specific range coder implementation
228 */
229
230 71463 static int vp56_rac_gets(VPXRangeCoder *c, int bits)
231 {
232 71463 int value = 0;
233
234
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 298997 while (bits--) {
235 227534 value = (value << 1) | vpx_rac_get(c);
236 }
237
238 71463 return value;
239 }
240
241 // P(7)
242 9309 static av_unused int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
243 {
244 9309 int v = vp56_rac_gets(c, 7) << 1;
245 9309 return v + !v;
246 }
247
248 static av_always_inline
249 534023 int vp56_rac_get_tree(VPXRangeCoder *c,
250 const VP56Tree *tree,
251 const uint8_t *probs)
252 {
253
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 2108126 while (tree->val > 0) {
254
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 1574103 if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
255 507766 tree += tree->val;
256 else
257 1066337 tree++;
258 }
259 534023 return -tree->val;
260 }
261
262 #endif /* AVCODEC_VP56_H */
263