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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 "get_bits.h" | |
30 | #include "hpeldsp.h" | |
31 | #include "bytestream.h" | |
32 | #include "h264chroma.h" | |
33 | #include "videodsp.h" | |
34 | #include "vp3dsp.h" | |
35 | #include "vp56dsp.h" | |
36 | ||
37 | typedef struct vp56_context VP56Context; | |
38 | ||
39 | typedef enum { | |
40 | VP56_FRAME_NONE =-1, | |
41 | VP56_FRAME_CURRENT = 0, | |
42 | VP56_FRAME_PREVIOUS = 1, | |
43 | VP56_FRAME_GOLDEN = 2, | |
44 | VP56_FRAME_GOLDEN2 = 3, | |
45 | } VP56Frame; | |
46 | ||
47 | typedef enum { | |
48 | VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */ | |
49 | VP56_MB_INTRA = 1, /**< Intra MB */ | |
50 | VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */ | |
51 | VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */ | |
52 | VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */ | |
53 | VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */ | |
54 | VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */ | |
55 | VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */ | |
56 | VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */ | |
57 | VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */ | |
58 | } VP56mb; | |
59 | ||
60 | typedef struct VP56Tree { | |
61 | int8_t val; | |
62 | int8_t prob_idx; | |
63 | } VP56Tree; | |
64 | ||
65 | typedef struct VP56mv { | |
66 | DECLARE_ALIGNED(4, int16_t, x); | |
67 | int16_t y; | |
68 | } VP56mv; | |
69 | ||
70 | #define VP56_SIZE_CHANGE 1 | |
71 | ||
72 | typedef void (*VP56ParseVectorAdjustment)(VP56Context *s, | |
73 | VP56mv *vect); | |
74 | typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src, | |
75 | int offset1, int offset2, int stride, | |
76 | VP56mv mv, int mask, int select, int luma); | |
77 | typedef void (*VP56ParseCoeff)(VP56Context *s); | |
78 | typedef void (*VP56DefaultModelsInit)(VP56Context *s); | |
79 | typedef void (*VP56ParseVectorModels)(VP56Context *s); | |
80 | typedef int (*VP56ParseCoeffModels)(VP56Context *s); | |
81 | typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf, | |
82 | int buf_size); | |
83 | ||
84 | typedef struct VP56RangeCoder { | |
85 | int high; | |
86 | int bits; /* stored negated (i.e. negative "bits" is a positive number of | |
87 | bits left) in order to eliminate a negate in cache refilling */ | |
88 | const uint8_t *buffer; | |
89 | const uint8_t *end; | |
90 | unsigned int code_word; | |
91 | } VP56RangeCoder; | |
92 | ||
93 | typedef struct VP56RefDc { | |
94 | uint8_t not_null_dc; | |
95 | VP56Frame ref_frame; | |
96 | int16_t dc_coeff; | |
97 | } VP56RefDc; | |
98 | ||
99 | typedef struct VP56Macroblock { | |
100 | uint8_t type; | |
101 | VP56mv mv; | |
102 | } VP56Macroblock; | |
103 | ||
104 | typedef struct VP56Model { | |
105 | uint8_t coeff_reorder[64]; /* used in vp6 only */ | |
106 | uint8_t coeff_index_to_pos[64]; /* used in vp6 only */ | |
107 | uint8_t vector_sig[2]; /* delta sign */ | |
108 | uint8_t vector_dct[2]; /* delta coding types */ | |
109 | uint8_t vector_pdi[2][2]; /* predefined delta init */ | |
110 | uint8_t vector_pdv[2][7]; /* predefined delta values */ | |
111 | uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */ | |
112 | uint8_t coeff_dccv[2][11]; /* DC coeff value */ | |
113 | uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */ | |
114 | uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */ | |
115 | uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */ | |
116 | uint8_t coeff_runv[2][14]; /* run value (vp6 only) */ | |
117 | uint8_t mb_type[3][10][10]; /* model for decoding MB type */ | |
118 | uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */ | |
119 | } VP56Model; | |
120 | ||
121 | struct vp56_context { | |
122 | AVCodecContext *avctx; | |
123 | H264ChromaContext h264chroma; | |
124 | HpelDSPContext hdsp; | |
125 | VideoDSPContext vdsp; | |
126 | VP3DSPContext vp3dsp; | |
127 | VP56DSPContext vp56dsp; | |
128 | uint8_t idct_scantable[64]; | |
129 | AVFrame *frames[4]; | |
130 | uint8_t *edge_emu_buffer_alloc; | |
131 | uint8_t *edge_emu_buffer; | |
132 | VP56RangeCoder c; | |
133 | VP56RangeCoder cc; | |
134 | VP56RangeCoder *ccp; | |
135 | int sub_version; | |
136 | ||
137 | /* frame info */ | |
138 | int golden_frame; | |
139 | int plane_width[4]; | |
140 | int plane_height[4]; | |
141 | int mb_width; /* number of horizontal MB */ | |
142 | int mb_height; /* number of vertical MB */ | |
143 | int block_offset[6]; | |
144 | ||
145 | int quantizer; | |
146 | uint16_t dequant_dc; | |
147 | uint16_t dequant_ac; | |
148 | ||
149 | /* DC predictors management */ | |
150 | VP56RefDc *above_blocks; | |
151 | VP56RefDc left_block[4]; | |
152 | int above_block_idx[6]; | |
153 | int16_t prev_dc[3][3]; /* [plan][ref_frame] */ | |
154 | ||
155 | /* blocks / macroblock */ | |
156 | VP56mb mb_type; | |
157 | VP56Macroblock *macroblocks; | |
158 | DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64]; | |
159 | ||
160 | /* motion vectors */ | |
161 | VP56mv mv[6]; /* vectors for each block in MB */ | |
162 | VP56mv vector_candidate[2]; | |
163 | int vector_candidate_pos; | |
164 | ||
165 | /* filtering hints */ | |
166 | int filter_header; /* used in vp6 only */ | |
167 | int deblock_filtering; | |
168 | int filter_selection; | |
169 | int filter_mode; | |
170 | int max_vector_length; | |
171 | int sample_variance_threshold; | |
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 | /* upside-down flipping hints */ | |
179 | int flip; /* are we flipping ? */ | |
180 | int frbi; /* first row block index in MB */ | |
181 | int srbi; /* second row block index in MB */ | |
182 | int stride[4]; /* stride for each plan */ | |
183 | ||
184 | const uint8_t *vp56_coord_div; | |
185 | VP56ParseVectorAdjustment parse_vector_adjustment; | |
186 | VP56Filter filter; | |
187 | VP56ParseCoeff parse_coeff; | |
188 | VP56DefaultModelsInit default_models_init; | |
189 | VP56ParseVectorModels parse_vector_models; | |
190 | VP56ParseCoeffModels parse_coeff_models; | |
191 | VP56ParseHeader parse_header; | |
192 | ||
193 | /* for "slice" parallelism between YUV and A */ | |
194 | VP56Context *alpha_context; | |
195 | ||
196 | VP56Model *modelp; | |
197 | VP56Model model; | |
198 | ||
199 | /* huffman decoding */ | |
200 | int use_huffman; | |
201 | GetBitContext gb; | |
202 | VLC dccv_vlc[2]; | |
203 | VLC runv_vlc[2]; | |
204 | VLC ract_vlc[2][3][6]; | |
205 | unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */ | |
206 | }; | |
207 | ||
208 | ||
209 | int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha); | |
210 | int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, | |
211 | int flip, int has_alpha); | |
212 | int ff_vp56_free(AVCodecContext *avctx); | |
213 | int ff_vp56_free_context(VP56Context *s); | |
214 | void ff_vp56_init_dequant(VP56Context *s, int quantizer); | |
215 | int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
216 | AVPacket *avpkt); | |
217 | ||
218 | ||
219 | /** | |
220 | * vp56 specific range coder implementation | |
221 | */ | |
222 | ||
223 | extern const uint8_t ff_vp56_norm_shift[256]; | |
224 | void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size); | |
225 | ||
226 | static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c) | |
227 | { | |
228 | int shift = ff_vp56_norm_shift[c->high]; | |
229 | int bits = c->bits; | |
230 | unsigned int code_word = c->code_word; | |
231 | ||
232 | c->high <<= shift; | |
233 | code_word <<= shift; | |
234 | bits += shift; | |
235 | if(bits >= 0 && c->buffer < c->end) { | |
236 | code_word |= bytestream_get_be16(&c->buffer) << bits; | |
237 | bits -= 16; | |
238 | } | |
239 | c->bits = bits; | |
240 | return code_word; | |
241 | } | |
242 | ||
243 | #if ARCH_ARM | |
244 | #include "arm/vp56_arith.h" | |
245 | #elif ARCH_X86 | |
246 | #include "x86/vp56_arith.h" | |
247 | #endif | |
248 | ||
249 | #ifndef vp56_rac_get_prob | |
250 | #define vp56_rac_get_prob vp56_rac_get_prob | |
251 | static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob) | |
252 | { | |
253 | unsigned int code_word = vp56_rac_renorm(c); | |
254 | unsigned int low = 1 + (((c->high - 1) * prob) >> 8); | |
255 | unsigned int low_shift = low << 16; | |
256 | int bit = code_word >= low_shift; | |
257 | ||
258 | c->high = bit ? c->high - low : low; | |
259 | c->code_word = bit ? code_word - low_shift : code_word; | |
260 | ||
261 | return bit; | |
262 | } | |
263 | #endif | |
264 | ||
265 | #ifndef vp56_rac_get_prob_branchy | |
266 | // branchy variant, to be used where there's a branch based on the bit decoded | |
267 | static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob) | |
268 | { | |
269 | unsigned long code_word = vp56_rac_renorm(c); | |
270 | unsigned low = 1 + (((c->high - 1) * prob) >> 8); | |
271 | unsigned low_shift = low << 16; | |
272 | ||
273 | if (code_word >= low_shift) { | |
274 | c->high -= low; | |
275 | c->code_word = code_word - low_shift; | |
276 | return 1; | |
277 | } | |
278 | ||
279 | c->high = low; | |
280 | c->code_word = code_word; | |
281 | return 0; | |
282 | } | |
283 | #endif | |
284 | ||
285 | static av_always_inline int vp56_rac_get(VP56RangeCoder *c) | |
286 | { | |
287 | unsigned int code_word = vp56_rac_renorm(c); | |
288 | /* equiprobable */ | |
289 | int low = (c->high + 1) >> 1; | |
290 | unsigned int low_shift = low << 16; | |
291 | int bit = code_word >= low_shift; | |
292 | if (bit) { | |
293 | c->high -= low; | |
294 | code_word -= low_shift; | |
295 | } else { | |
296 | c->high = low; | |
297 | } | |
298 | ||
299 | c->code_word = code_word; | |
300 | return bit; | |
301 | } | |
302 | ||
303 | // rounding is different than vp56_rac_get, is vp56_rac_get wrong? | |
304 | static av_always_inline int vp8_rac_get(VP56RangeCoder *c) | |
305 | { | |
306 | return vp56_rac_get_prob(c, 128); | |
307 | } | |
308 | ||
309 | static int vp56_rac_gets(VP56RangeCoder *c, int bits) | |
310 | { | |
311 | int value = 0; | |
312 | ||
313 | while (bits--) { | |
314 | value = (value << 1) | vp56_rac_get(c); | |
315 | } | |
316 | ||
317 | return value; | |
318 | } | |
319 | ||
320 | static int vp8_rac_get_uint(VP56RangeCoder *c, int bits) | |
321 | { | |
322 | int value = 0; | |
323 | ||
324 | while (bits--) { | |
325 | value = (value << 1) | vp8_rac_get(c); | |
326 | } | |
327 | ||
328 | return value; | |
329 | } | |
330 | ||
331 | // fixme: add 1 bit to all the calls to this? | |
332 | static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits) | |
333 | { | |
334 | int v; | |
335 | ||
336 | if (!vp8_rac_get(c)) | |
337 | return 0; | |
338 | ||
339 | v = vp8_rac_get_uint(c, bits); | |
340 | ||
341 | if (vp8_rac_get(c)) | |
342 | v = -v; | |
343 | ||
344 | return v; | |
345 | } | |
346 | ||
347 | // P(7) | |
348 | static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits) | |
349 | { | |
350 | int v = vp56_rac_gets(c, 7) << 1; | |
351 | return v + !v; | |
352 | } | |
353 | ||
354 | static av_unused int vp8_rac_get_nn(VP56RangeCoder *c) | |
355 | { | |
356 | int v = vp8_rac_get_uint(c, 7) << 1; | |
357 | return v + !v; | |
358 | } | |
359 | ||
360 | static av_always_inline | |
361 | int vp56_rac_get_tree(VP56RangeCoder *c, | |
362 | const VP56Tree *tree, | |
363 | const uint8_t *probs) | |
364 | { | |
365 | while (tree->val > 0) { | |
366 | if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx])) | |
367 | tree += tree->val; | |
368 | else | |
369 | tree++; | |
370 | } | |
371 | return -tree->val; | |
372 | } | |
373 | ||
374 | // how probabilities are associated with decisions is different I think | |
375 | // well, the new scheme fits in the old but this way has one fewer branches per decision | |
376 | static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2], | |
377 | const uint8_t *probs) | |
378 | { | |
379 | int i = 0; | |
380 | ||
381 | do { | |
382 | i = tree[i][vp56_rac_get_prob(c, probs[i])]; | |
383 | } while (i > 0); | |
384 | ||
385 | return -i; | |
386 | } | |
387 | ||
388 | // DCTextra | |
389 | static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob) | |
390 | { | |
391 | int v = 0; | |
392 | ||
393 | do { | |
394 | v = (v<<1) + vp56_rac_get_prob(c, *prob++); | |
395 | } while (*prob); | |
396 | ||
397 | return v; | |
398 | } | |
399 | ||
400 | #endif /* AVCODEC_VP56_H */ |