/** * @file libavcodec/vp56.h * VP5 and VP6 compatible video decoder (common features) * * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_VP56_H #define AVCODEC_VP56_H #include "vp56data.h" #include "dsputil.h" #include "bitstream.h" #include "bytestream.h" typedef struct vp56_context VP56Context; typedef struct vp56_mv VP56mv; typedef void (*VP56ParseVectorAdjustment)(VP56Context *s, VP56mv *vect); typedef int (*VP56Adjust)(int v, int t); typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src, int offset1, int offset2, int stride, VP56mv mv, int mask, int select, int luma); typedef void (*VP56ParseCoeff)(VP56Context *s); typedef void (*VP56DefaultModelsInit)(VP56Context *s); typedef void (*VP56ParseVectorModels)(VP56Context *s); typedef void (*VP56ParseCoeffModels)(VP56Context *s); typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf, int buf_size, int *golden_frame); typedef struct { int high; int bits; const uint8_t *buffer; unsigned long code_word; } VP56RangeCoder; typedef struct { uint8_t not_null_dc; VP56Frame ref_frame; DCTELEM dc_coeff; } VP56RefDc; struct vp56_mv { int x; int y; }; typedef struct { uint8_t type; VP56mv mv; } VP56Macroblock; typedef struct { uint8_t coeff_reorder[64]; /* used in vp6 only */ uint8_t coeff_index_to_pos[64]; /* used in vp6 only */ uint8_t vector_sig[2]; /* delta sign */ uint8_t vector_dct[2]; /* delta coding types */ uint8_t vector_pdi[2][2]; /* predefined delta init */ uint8_t vector_pdv[2][7]; /* predefined delta values */ uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */ uint8_t coeff_dccv[2][11]; /* DC coeff value */ uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */ uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */ uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */ uint8_t coeff_runv[2][14]; /* run value (vp6 only) */ uint8_t mb_type[3][10][10]; /* model for decoding MB type */ uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */ } VP56Model; struct vp56_context { AVCodecContext *avctx; DSPContext dsp; ScanTable scantable; AVFrame frames[4]; AVFrame *framep[6]; uint8_t *edge_emu_buffer_alloc; uint8_t *edge_emu_buffer; VP56RangeCoder c; VP56RangeCoder cc; VP56RangeCoder *ccp; int sub_version; /* frame info */ int plane_width[4]; int plane_height[4]; int mb_width; /* number of horizontal MB */ int mb_height; /* number of vertical MB */ int block_offset[6]; int quantizer; uint16_t dequant_dc; uint16_t dequant_ac; /* DC predictors management */ VP56RefDc *above_blocks; VP56RefDc left_block[4]; int above_block_idx[6]; DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */ /* blocks / macroblock */ VP56mb mb_type; VP56Macroblock *macroblocks; DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]); /* motion vectors */ VP56mv mv[6]; /* vectors for each block in MB */ VP56mv vector_candidate[2]; int vector_candidate_pos; /* filtering hints */ int filter_header; /* used in vp6 only */ int deblock_filtering; int filter_selection; int filter_mode; int max_vector_length; int sample_variance_threshold; uint8_t coeff_ctx[4][64]; /* used in vp5 only */ uint8_t coeff_ctx_last[4]; /* used in vp5 only */ int has_alpha; /* upside-down flipping hints */ int flip; /* are we flipping ? */ int frbi; /* first row block index in MB */ int srbi; /* second row block index in MB */ int stride[4]; /* stride for each plan */ const uint8_t *vp56_coord_div; VP56ParseVectorAdjustment parse_vector_adjustment; VP56Adjust adjust; VP56Filter filter; VP56ParseCoeff parse_coeff; VP56DefaultModelsInit default_models_init; VP56ParseVectorModels parse_vector_models; VP56ParseCoeffModels parse_coeff_models; VP56ParseHeader parse_header; VP56Model *modelp; VP56Model models[2]; /* huffman decoding */ int use_huffman; GetBitContext gb; VLC dccv_vlc[2]; VLC runv_vlc[2]; VLC ract_vlc[2][3][6]; unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */ }; void vp56_init(AVCodecContext *avctx, int flip, int has_alpha); int vp56_free(AVCodecContext *avctx); void vp56_init_dequant(VP56Context *s, int quantizer); int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size); /** * vp56 specific range coder implementation */ static inline void vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size) { c->high = 255; c->bits = 8; c->buffer = buf; c->code_word = bytestream_get_be16(&c->buffer); } static inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob) { unsigned int low = 1 + (((c->high - 1) * prob) / 256); unsigned int low_shift = low << 8; int bit = c->code_word >= low_shift; if (bit) { c->high -= low; c->code_word -= low_shift; } else { c->high = low; } /* normalize */ while (c->high < 128) { c->high <<= 1; c->code_word <<= 1; if (--c->bits == 0) { c->bits = 8; c->code_word |= *c->buffer++; } } return bit; } static inline int vp56_rac_get(VP56RangeCoder *c) { /* equiprobable */ int low = (c->high + 1) >> 1; unsigned int low_shift = low << 8; int bit = c->code_word >= low_shift; if (bit) { c->high = (c->high - low) << 1; c->code_word -= low_shift; } else { c->high = low << 1; } /* normalize */ c->code_word <<= 1; if (--c->bits == 0) { c->bits = 8; c->code_word |= *c->buffer++; } return bit; } static inline int vp56_rac_gets(VP56RangeCoder *c, int bits) { int value = 0; while (bits--) { value = (value << 1) | vp56_rac_get(c); } return value; } static inline int vp56_rac_gets_nn(VP56RangeCoder *c, int bits) { int v = vp56_rac_gets(c, 7) << 1; return v + !v; } static inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs) { while (tree->val > 0) { if (vp56_rac_get_prob(c, probs[tree->prob_idx])) tree += tree->val; else tree++; } return -tree->val; } #endif /* AVCODEC_VP56_H */