FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vp56.h
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 79 79 100.0%
Branches: 28 28 100.0%

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 "bytestream.h"
35 #include "h264chroma.h"
36 #include "videodsp.h"
37 #include "vp3dsp.h"
38 #include "vp56dsp.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 VP56_FRAME_GOLDEN2 = 3,
48 } VP56Frame;
49
50 typedef enum {
51 VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
52 VP56_MB_INTRA = 1, /**< Intra MB */
53 VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
54 VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
55 VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
56 VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
57 VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
58 VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
59 VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
60 VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
61 } VP56mb;
62
63 typedef struct VP56Tree {
64 int8_t val;
65 int8_t prob_idx;
66 } VP56Tree;
67
68 typedef struct VP56mv {
69 DECLARE_ALIGNED(4, int16_t, x);
70 int16_t y;
71 } VP56mv;
72
73 #define VP56_SIZE_CHANGE 1
74
75 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
76 VP56mv *vect);
77 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
78 int offset1, int offset2, ptrdiff_t stride,
79 VP56mv mv, int mask, int select, int luma);
80 typedef int (*VP56ParseCoeff)(VP56Context *s);
81 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
82 typedef void (*VP56ParseVectorModels)(VP56Context *s);
83 typedef int (*VP56ParseCoeffModels)(VP56Context *s);
84 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
85 int buf_size);
86
87 typedef struct VP56RangeCoder {
88 int high;
89 int bits; /* stored negated (i.e. negative "bits" is a positive number of
90 bits left) in order to eliminate a negate in cache refilling */
91 const uint8_t *buffer;
92 const uint8_t *end;
93 unsigned int code_word;
94 int end_reached;
95 } VP56RangeCoder;
96
97 typedef struct VP56RefDc {
98 uint8_t not_null_dc;
99 VP56Frame ref_frame;
100 int16_t dc_coeff;
101 } VP56RefDc;
102
103 typedef struct VP56Macroblock {
104 uint8_t type;
105 VP56mv mv;
106 } VP56Macroblock;
107
108 typedef struct VP56Model {
109 uint8_t coeff_reorder[64]; /* used in vp6 only */
110 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
111 uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
112 uint8_t vector_sig[2]; /* delta sign */
113 uint8_t vector_dct[2]; /* delta coding types */
114 uint8_t vector_pdi[2][2]; /* predefined delta init */
115 uint8_t vector_pdv[2][7]; /* predefined delta values */
116 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
117 uint8_t coeff_dccv[2][11]; /* DC coeff value */
118 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
119 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
120 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
121 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
122 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
123 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
124 } VP56Model;
125
126 struct vp56_context {
127 AVCodecContext *avctx;
128 H264ChromaContext h264chroma;
129 HpelDSPContext hdsp;
130 VideoDSPContext vdsp;
131 VP3DSPContext vp3dsp;
132 VP56DSPContext vp56dsp;
133 uint8_t idct_scantable[64];
134 AVFrame *frames[4];
135 uint8_t *edge_emu_buffer_alloc;
136 uint8_t *edge_emu_buffer;
137 VP56RangeCoder c;
138 VP56RangeCoder cc;
139 VP56RangeCoder *ccp;
140 int sub_version;
141
142 /* frame info */
143 int golden_frame;
144 int plane_width[4];
145 int plane_height[4];
146 int mb_width; /* number of horizontal MB */
147 int mb_height; /* number of vertical MB */
148 int block_offset[6];
149
150 int quantizer;
151 uint16_t dequant_dc;
152 uint16_t dequant_ac;
153
154 /* DC predictors management */
155 VP56RefDc *above_blocks;
156 VP56RefDc left_block[4];
157 int above_block_idx[6];
158 int16_t prev_dc[3][3]; /* [plan][ref_frame] */
159
160 /* blocks / macroblock */
161 VP56mb mb_type;
162 VP56Macroblock *macroblocks;
163 DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
164 int idct_selector[6];
165
166 /* motion vectors */
167 VP56mv mv[6]; /* vectors for each block in MB */
168 VP56mv vector_candidate[2];
169 int vector_candidate_pos;
170
171 /* filtering hints */
172 int filter_header; /* used in vp6 only */
173 int deblock_filtering;
174 int filter_selection;
175 int filter_mode;
176 int max_vector_length;
177 int sample_variance_threshold;
178 DECLARE_ALIGNED(8, int, bounding_values_array)[256];
179
180 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
181 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
182
183 int has_alpha;
184
185 /* upside-down flipping hints */
186 int flip; /* are we flipping ? */
187 int frbi; /* first row block index in MB */
188 int srbi; /* second row block index in MB */
189 ptrdiff_t stride[4]; /* stride for each plan */
190
191 const uint8_t *vp56_coord_div;
192 VP56ParseVectorAdjustment parse_vector_adjustment;
193 VP56Filter filter;
194 VP56ParseCoeff parse_coeff;
195 VP56DefaultModelsInit default_models_init;
196 VP56ParseVectorModels parse_vector_models;
197 VP56ParseCoeffModels parse_coeff_models;
198 VP56ParseHeader parse_header;
199
200 /* for "slice" parallelism between YUV and A */
201 VP56Context *alpha_context;
202
203 VP56Model *modelp;
204 VP56Model model;
205
206 /* huffman decoding */
207 int use_huffman;
208 GetBitContext gb;
209 VLC dccv_vlc[2];
210 VLC runv_vlc[2];
211 VLC ract_vlc[2][3][6];
212 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
213
214 int have_undamaged_frame;
215 int discard_frame;
216 };
217
218
219 int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
220 int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
221 int flip, int has_alpha);
222 int ff_vp56_free(AVCodecContext *avctx);
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, void *data, int *got_frame,
226 AVPacket *avpkt);
227
228
229 /**
230 * vp56 specific range coder implementation
231 */
232
233 extern const uint8_t ff_vp56_norm_shift[256];
234 int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
235
236 /**
237 * vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
238 */
239 746247 static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
240 {
241
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746247 if (c->end <= c->buffer && c->bits >= 0)
242 11 c->end_reached ++;
243 746247 return c->end_reached > 10;
244 }
245
246 97414603 static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
247 {
248 97414603 int shift = ff_vp56_norm_shift[c->high];
249 97414603 int bits = c->bits;
250 97414603 unsigned int code_word = c->code_word;
251
252 97414603 c->high <<= shift;
253 97414603 code_word <<= shift;
254 97414603 bits += shift;
255
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97414603 if(bits >= 0 && c->buffer < c->end) {
256 4204777 code_word |= bytestream_get_be16(&c->buffer) << bits;
257 4204777 bits -= 16;
258 }
259 97414603 c->bits = bits;
260 97414603 return code_word;
261 }
262
263 #if ARCH_ARM
264 #include "arm/vp56_arith.h"
265 #elif ARCH_X86
266 #include "x86/vp56_arith.h"
267 #endif
268
269 #ifndef vp56_rac_get_prob
270 #define vp56_rac_get_prob vp56_rac_get_prob
271 static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
272 {
273 unsigned int code_word = vp56_rac_renorm(c);
274 unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
275 unsigned int low_shift = low << 16;
276 int bit = code_word >= low_shift;
277
278 c->high = bit ? c->high - low : low;
279 c->code_word = bit ? code_word - low_shift : code_word;
280
281 return bit;
282 }
283 #endif
284
285 #ifndef vp56_rac_get_prob_branchy
286 // branchy variant, to be used where there's a branch based on the bit decoded
287 66757341 static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
288 {
289 66757341 unsigned long code_word = vp56_rac_renorm(c);
290 66757341 unsigned low = 1 + (((c->high - 1) * prob) >> 8);
291 66757341 unsigned low_shift = low << 16;
292
293
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66757341 if (code_word >= low_shift) {
294 30859269 c->high -= low;
295 30859269 c->code_word = code_word - low_shift;
296 30859269 return 1;
297 }
298
299 35898072 c->high = low;
300 35898072 c->code_word = code_word;
301 35898072 return 0;
302 }
303 #endif
304
305 1303604 static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
306 {
307 1303604 unsigned int code_word = vp56_rac_renorm(c);
308 /* equiprobable */
309 1303604 int low = (c->high + 1) >> 1;
310 1303604 unsigned int low_shift = low << 16;
311 1303604 int bit = code_word >= low_shift;
312
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1303604 if (bit) {
313 651693 c->high -= low;
314 651693 code_word -= low_shift;
315 } else {
316 651911 c->high = low;
317 }
318
319 1303604 c->code_word = code_word;
320 1303604 return bit;
321 }
322
323 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
324 10195028 static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
325 {
326 10195028 return vp56_rac_get_prob(c, 128);
327 }
328
329 52237 static int vp56_rac_gets(VP56RangeCoder *c, int bits)
330 {
331 52237 int value = 0;
332
333
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203495 while (bits--) {
334 151258 value = (value << 1) | vp56_rac_get(c);
335 }
336
337 52237 return value;
338 }
339
340 48223 static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
341 {
342 48223 int value = 0;
343
344
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292251 while (bits--) {
345 244028 value = (value << 1) | vp8_rac_get(c);
346 }
347
348 48223 return value;
349 }
350
351 // fixme: add 1 bit to all the calls to this?
352 6104 static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
353 {
354 int v;
355
356
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6104 if (!vp8_rac_get(c))
357 5361 return 0;
358
359 743 v = vp8_rac_get_uint(c, bits);
360
361
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743 if (vp8_rac_get(c))
362 98 v = -v;
363
364 743 return v;
365 }
366
367 // P(7)
368 8496 static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
369 {
370 8496 int v = vp56_rac_gets(c, 7) << 1;
371 8496 return v + !v;
372 }
373
374 306 static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
375 {
376 306 int v = vp8_rac_get_uint(c, 7) << 1;
377 306 return v + !v;
378 }
379
380 static av_always_inline
381 445510 int vp56_rac_get_tree(VP56RangeCoder *c,
382 const VP56Tree *tree,
383 const uint8_t *probs)
384 {
385
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1764929 while (tree->val > 0) {
386
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1319419 if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
387 450669 tree += tree->val;
388 else
389 868750 tree++;
390 }
391 445510 return -tree->val;
392 }
393
394 // how probabilities are associated with decisions is different I think
395 // well, the new scheme fits in the old but this way has one fewer branches per decision
396 4234523 static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
397 const uint8_t *probs)
398 {
399 4234523 int i = 0;
400
401 do {
402 9436950 i = tree[i][vp56_rac_get_prob(c, probs[i])];
403
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9436950 } while (i > 0);
404
405 4234523 return -i;
406 }
407
408 // DCTextra
409 43890 static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
410 {
411 43890 int v = 0;
412
413 do {
414 163810 v = (v<<1) + vp56_rac_get_prob(c, *prob++);
415
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163810 } while (*prob);
416
417 43890 return v;
418 }
419
420 #endif /* AVCODEC_VP56_H */
421