2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * VP5 and VP6 compatible video decoder (common features)
26 #ifndef AVCODEC_VP56_H
27 #define AVCODEC_VP56_H
31 #include "bytestream.h"
32 #include "h264chroma.h"
37 typedef struct vp56_context VP56Context;
41 VP56_FRAME_CURRENT = 0,
42 VP56_FRAME_PREVIOUS = 1,
43 VP56_FRAME_GOLDEN = 2,
44 VP56_FRAME_GOLDEN2 = 3,
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 */
60 typedef struct VP56Tree {
65 typedef struct VP56mv {
66 DECLARE_ALIGNED(4, int16_t, x);
70 #define VP56_SIZE_CHANGE 1
72 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
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, int *golden_frame);
84 typedef struct VP56RangeCoder {
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;
90 unsigned int code_word;
93 typedef struct VP56RefDc {
99 typedef struct VP56Macroblock {
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 */
121 struct vp56_context {
122 AVCodecContext *avctx;
123 H264ChromaContext h264chroma;
125 VideoDSPContext vdsp;
126 VP3DSPContext vp3dsp;
127 VP56DSPContext vp56dsp;
128 uint8_t idct_scantable[64];
130 uint8_t *edge_emu_buffer_alloc;
131 uint8_t *edge_emu_buffer;
140 int mb_width; /* number of horizontal MB */
141 int mb_height; /* number of vertical MB */
148 /* DC predictors management */
149 VP56RefDc *above_blocks;
150 VP56RefDc left_block[4];
151 int above_block_idx[6];
152 int16_t prev_dc[3][3]; /* [plan][ref_frame] */
154 /* blocks / macroblock */
156 VP56Macroblock *macroblocks;
157 DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
160 VP56mv mv[6]; /* vectors for each block in MB */
161 VP56mv vector_candidate[2];
162 int vector_candidate_pos;
164 /* filtering hints */
165 int filter_header; /* used in vp6 only */
166 int deblock_filtering;
167 int filter_selection;
169 int max_vector_length;
170 int sample_variance_threshold;
172 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
173 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
177 /* upside-down flipping hints */
178 int flip; /* are we flipping ? */
179 int frbi; /* first row block index in MB */
180 int srbi; /* second row block index in MB */
181 int stride[4]; /* stride for each plan */
183 const uint8_t *vp56_coord_div;
184 VP56ParseVectorAdjustment parse_vector_adjustment;
186 VP56ParseCoeff parse_coeff;
187 VP56DefaultModelsInit default_models_init;
188 VP56ParseVectorModels parse_vector_models;
189 VP56ParseCoeffModels parse_coeff_models;
190 VP56ParseHeader parse_header;
195 /* huffman decoding */
200 VLC ract_vlc[2][3][6];
201 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
205 int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
206 int ff_vp56_free(AVCodecContext *avctx);
207 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
208 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
213 * vp56 specific range coder implementation
216 extern const uint8_t ff_vp56_norm_shift[256];
217 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
219 static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
221 int shift = ff_vp56_norm_shift[c->high];
223 unsigned int code_word = c->code_word;
228 if(bits >= 0 && c->buffer < c->end) {
229 code_word |= bytestream_get_be16(&c->buffer) << bits;
237 #include "arm/vp56_arith.h"
239 #include "x86/vp56_arith.h"
242 #ifndef vp56_rac_get_prob
243 #define vp56_rac_get_prob vp56_rac_get_prob
244 static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
246 unsigned int code_word = vp56_rac_renorm(c);
247 unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
248 unsigned int low_shift = low << 16;
249 int bit = code_word >= low_shift;
251 c->high = bit ? c->high - low : low;
252 c->code_word = bit ? code_word - low_shift : code_word;
258 #ifndef vp56_rac_get_prob_branchy
259 // branchy variant, to be used where there's a branch based on the bit decoded
260 static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
262 unsigned long code_word = vp56_rac_renorm(c);
263 unsigned low = 1 + (((c->high - 1) * prob) >> 8);
264 unsigned low_shift = low << 16;
266 if (code_word >= low_shift) {
268 c->code_word = code_word - low_shift;
273 c->code_word = code_word;
278 static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
280 unsigned int code_word = vp56_rac_renorm(c);
282 int low = (c->high + 1) >> 1;
283 unsigned int low_shift = low << 16;
284 int bit = code_word >= low_shift;
287 code_word -= low_shift;
292 c->code_word = code_word;
296 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
297 static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
299 return vp56_rac_get_prob(c, 128);
302 static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
307 value = (value << 1) | vp56_rac_get(c);
313 static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
318 value = (value << 1) | vp8_rac_get(c);
324 // fixme: add 1 bit to all the calls to this?
325 static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
332 v = vp8_rac_get_uint(c, bits);
341 static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
343 int v = vp56_rac_gets(c, 7) << 1;
347 static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
349 int v = vp8_rac_get_uint(c, 7) << 1;
353 static av_always_inline
354 int vp56_rac_get_tree(VP56RangeCoder *c,
355 const VP56Tree *tree,
356 const uint8_t *probs)
358 while (tree->val > 0) {
359 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
368 * This is identical to vp8_rac_get_tree except for the possibility of starting
369 * on a node other than the root node, needed for coeff decode where this is
370 * used to save a bit after a 0 token (by disallowing EOB to immediately follow.)
372 static av_always_inline
373 int vp8_rac_get_tree_with_offset(VP56RangeCoder *c, const int8_t (*tree)[2],
374 const uint8_t *probs, int i)
377 i = tree[i][vp56_rac_get_prob(c, probs[i])];
383 // how probabilities are associated with decisions is different I think
384 // well, the new scheme fits in the old but this way has one fewer branches per decision
385 static av_always_inline
386 int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
387 const uint8_t *probs)
389 return vp8_rac_get_tree_with_offset(c, tree, probs, 0);
393 static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
398 v = (v<<1) + vp56_rac_get_prob(c, *prob++);
404 #endif /* AVCODEC_VP56_H */