/* * 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 */ /** * @file * VP5 and VP6 compatible video decoder (common features) */ #ifndef AVCODEC_VP56_H #define AVCODEC_VP56_H #include "vp56data.h" #include "dsputil.h" #include "get_bits.h" #include "bytestream.h" #include "vp3dsp.h" #include "vp56dsp.h" typedef struct vp56_context VP56Context; typedef struct VP56mv { DECLARE_ALIGNED(4, int16_t, x); int16_t y; } VP56mv; typedef void (*VP56ParseVectorAdjustment)(VP56Context *s, VP56mv *vect); 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 int (*VP56ParseCoeffModels)(VP56Context *s); typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf, int buf_size); typedef struct VP56RangeCoder { int high; int bits; /* stored negated (i.e. negative "bits" is a positive number of bits left) in order to eliminate a negate in cache refilling */ const uint8_t *buffer; const uint8_t *end; unsigned int code_word; } VP56RangeCoder; typedef struct VP56RefDc { uint8_t not_null_dc; VP56Frame ref_frame; DCTELEM dc_coeff; } VP56RefDc; typedef struct VP56Macroblock { uint8_t type; VP56mv mv; } VP56Macroblock; typedef struct VP56Model { 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; VP3DSPContext vp3dsp; VP56DSPContext vp56dsp; 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 golden_frame; 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; int8_t *qscale_table; /* 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; VP56Filter filter; VP56ParseCoeff parse_coeff; VP56DefaultModelsInit default_models_init; VP56ParseVectorModels parse_vector_models; VP56ParseCoeffModels parse_coeff_models; VP56ParseHeader parse_header; /* for "slice" parallelism between YUV and A */ VP56Context *alpha_context; VP56Model *modelp; VP56Model model; /* 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 ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha); void ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, int flip, int has_alpha); int ff_vp56_free(AVCodecContext *avctx); int ff_vp56_free_context(VP56Context *s); void ff_vp56_init_dequant(VP56Context *s, int quantizer); int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt); /** * vp56 specific range coder implementation */ extern const uint8_t ff_vp56_norm_shift[256]; void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size); static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c) { int shift = ff_vp56_norm_shift[c->high]; int bits = c->bits; unsigned int code_word = c->code_word; c->high <<= shift; code_word <<= shift; bits += shift; if(bits >= 0 && c->buffer < c->end) { code_word |= bytestream_get_be16(&c->buffer) << bits; bits -= 16; } c->bits = bits; return code_word; } #if ARCH_ARM #include "arm/vp56_arith.h" #elif ARCH_X86 #include "x86/vp56_arith.h" #endif #ifndef vp56_rac_get_prob #define vp56_rac_get_prob vp56_rac_get_prob static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob) { unsigned int code_word = vp56_rac_renorm(c); unsigned int low = 1 + (((c->high - 1) * prob) >> 8); unsigned int low_shift = low << 16; int bit = code_word >= low_shift; c->high = bit ? c->high - low : low; c->code_word = bit ? code_word - low_shift : code_word; return bit; } #endif #ifndef vp56_rac_get_prob_branchy // branchy variant, to be used where there's a branch based on the bit decoded static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob) { unsigned long code_word = vp56_rac_renorm(c); unsigned low = 1 + (((c->high - 1) * prob) >> 8); unsigned low_shift = low << 16; if (code_word >= low_shift) { c->high -= low; c->code_word = code_word - low_shift; return 1; } c->high = low; c->code_word = code_word; return 0; } #endif static av_always_inline int vp56_rac_get(VP56RangeCoder *c) { unsigned int code_word = vp56_rac_renorm(c); /* equiprobable */ int low = (c->high + 1) >> 1; unsigned int low_shift = low << 16; int bit = code_word >= low_shift; if (bit) { c->high -= low; code_word -= low_shift; } else { c->high = low; } c->code_word = code_word; return bit; } // rounding is different than vp56_rac_get, is vp56_rac_get wrong? static av_always_inline int vp8_rac_get(VP56RangeCoder *c) { return vp56_rac_get_prob(c, 128); } static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits) { int value = 0; while (bits--) { value = (value << 1) | vp56_rac_get(c); } return value; } static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits) { int value = 0; while (bits--) { value = (value << 1) | vp8_rac_get(c); } return value; } // fixme: add 1 bit to all the calls to this? static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits) { int v; if (!vp8_rac_get(c)) return 0; v = vp8_rac_get_uint(c, bits); if (vp8_rac_get(c)) v = -v; return v; } // P(7) static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits) { int v = vp56_rac_gets(c, 7) << 1; return v + !v; } static av_unused int vp8_rac_get_nn(VP56RangeCoder *c) { int v = vp8_rac_get_uint(c, 7) << 1; return v + !v; } static av_always_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; } // how probabilities are associated with decisions is different I think // well, the new scheme fits in the old but this way has one fewer branches per decision static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2], const uint8_t *probs) { int i = 0; do { i = tree[i][vp56_rac_get_prob(c, probs[i])]; } while (i > 0); return -i; } // DCTextra static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob) { int v = 0; do { v = (v<<1) + vp56_rac_get_prob(c, *prob++); } while (*prob); return v; } #endif /* AVCODEC_VP56_H */