yading@10: /*
yading@10:  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * VP5 and VP6 compatible video decoder (common features)
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_VP56_H
yading@10: #define AVCODEC_VP56_H
yading@10: 
yading@10: #include "vp56data.h"
yading@10: #include "dsputil.h"
yading@10: #include "get_bits.h"
yading@10: #include "hpeldsp.h"
yading@10: #include "bytestream.h"
yading@10: #include "h264chroma.h"
yading@10: #include "videodsp.h"
yading@10: #include "vp3dsp.h"
yading@10: #include "vp56dsp.h"
yading@10: 
yading@10: typedef struct vp56_context VP56Context;
yading@10: 
yading@10: typedef struct VP56mv {
yading@10:     DECLARE_ALIGNED(4, int16_t, x);
yading@10:     int16_t y;
yading@10: } VP56mv;
yading@10: 
yading@10: #define VP56_SIZE_CHANGE 1
yading@10: 
yading@10: typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
yading@10:                                           VP56mv *vect);
yading@10: typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
yading@10:                            int offset1, int offset2, int stride,
yading@10:                            VP56mv mv, int mask, int select, int luma);
yading@10: typedef void (*VP56ParseCoeff)(VP56Context *s);
yading@10: typedef void (*VP56DefaultModelsInit)(VP56Context *s);
yading@10: typedef void (*VP56ParseVectorModels)(VP56Context *s);
yading@10: typedef int  (*VP56ParseCoeffModels)(VP56Context *s);
yading@10: typedef int  (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
yading@10:                                 int buf_size);
yading@10: 
yading@10: typedef struct VP56RangeCoder {
yading@10:     int high;
yading@10:     int bits; /* stored negated (i.e. negative "bits" is a positive number of
yading@10:                  bits left) in order to eliminate a negate in cache refilling */
yading@10:     const uint8_t *buffer;
yading@10:     const uint8_t *end;
yading@10:     unsigned int code_word;
yading@10: } VP56RangeCoder;
yading@10: 
yading@10: typedef struct VP56RefDc {
yading@10:     uint8_t not_null_dc;
yading@10:     VP56Frame ref_frame;
yading@10:     int16_t dc_coeff;
yading@10: } VP56RefDc;
yading@10: 
yading@10: typedef struct VP56Macroblock {
yading@10:     uint8_t type;
yading@10:     VP56mv mv;
yading@10: } VP56Macroblock;
yading@10: 
yading@10: typedef struct VP56Model {
yading@10:     uint8_t coeff_reorder[64];       /* used in vp6 only */
yading@10:     uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
yading@10:     uint8_t vector_sig[2];           /* delta sign */
yading@10:     uint8_t vector_dct[2];           /* delta coding types */
yading@10:     uint8_t vector_pdi[2][2];        /* predefined delta init */
yading@10:     uint8_t vector_pdv[2][7];        /* predefined delta values */
yading@10:     uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
yading@10:     uint8_t coeff_dccv[2][11];       /* DC coeff value */
yading@10:     uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
yading@10:     uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
yading@10:     uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
yading@10:     uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
yading@10:     uint8_t mb_type[3][10][10];      /* model for decoding MB type */
yading@10:     uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
yading@10: } VP56Model;
yading@10: 
yading@10: struct vp56_context {
yading@10:     AVCodecContext *avctx;
yading@10:     H264ChromaContext h264chroma;
yading@10:     HpelDSPContext hdsp;
yading@10:     VideoDSPContext vdsp;
yading@10:     VP3DSPContext vp3dsp;
yading@10:     VP56DSPContext vp56dsp;
yading@10:     uint8_t idct_scantable[64];
yading@10:     AVFrame *frames[4];
yading@10:     uint8_t *edge_emu_buffer_alloc;
yading@10:     uint8_t *edge_emu_buffer;
yading@10:     VP56RangeCoder c;
yading@10:     VP56RangeCoder cc;
yading@10:     VP56RangeCoder *ccp;
yading@10:     int sub_version;
yading@10: 
yading@10:     /* frame info */
yading@10:     int golden_frame;
yading@10:     int plane_width[4];
yading@10:     int plane_height[4];
yading@10:     int mb_width;   /* number of horizontal MB */
yading@10:     int mb_height;  /* number of vertical MB */
yading@10:     int block_offset[6];
yading@10: 
yading@10:     int quantizer;
yading@10:     uint16_t dequant_dc;
yading@10:     uint16_t dequant_ac;
yading@10: 
yading@10:     /* DC predictors management */
yading@10:     VP56RefDc *above_blocks;
yading@10:     VP56RefDc left_block[4];
yading@10:     int above_block_idx[6];
yading@10:     int16_t prev_dc[3][3];    /* [plan][ref_frame] */
yading@10: 
yading@10:     /* blocks / macroblock */
yading@10:     VP56mb mb_type;
yading@10:     VP56Macroblock *macroblocks;
yading@10:     DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
yading@10: 
yading@10:     /* motion vectors */
yading@10:     VP56mv mv[6];  /* vectors for each block in MB */
yading@10:     VP56mv vector_candidate[2];
yading@10:     int vector_candidate_pos;
yading@10: 
yading@10:     /* filtering hints */
yading@10:     int filter_header;               /* used in vp6 only */
yading@10:     int deblock_filtering;
yading@10:     int filter_selection;
yading@10:     int filter_mode;
yading@10:     int max_vector_length;
yading@10:     int sample_variance_threshold;
yading@10: 
yading@10:     uint8_t coeff_ctx[4][64];              /* used in vp5 only */
yading@10:     uint8_t coeff_ctx_last[4];             /* used in vp5 only */
yading@10: 
yading@10:     int has_alpha;
yading@10: 
yading@10:     /* upside-down flipping hints */
yading@10:     int flip;  /* are we flipping ? */
yading@10:     int frbi;  /* first row block index in MB */
yading@10:     int srbi;  /* second row block index in MB */
yading@10:     int stride[4];  /* stride for each plan */
yading@10: 
yading@10:     const uint8_t *vp56_coord_div;
yading@10:     VP56ParseVectorAdjustment parse_vector_adjustment;
yading@10:     VP56Filter filter;
yading@10:     VP56ParseCoeff parse_coeff;
yading@10:     VP56DefaultModelsInit default_models_init;
yading@10:     VP56ParseVectorModels parse_vector_models;
yading@10:     VP56ParseCoeffModels parse_coeff_models;
yading@10:     VP56ParseHeader parse_header;
yading@10: 
yading@10:     /* for "slice" parallelism between YUV and A */
yading@10:     VP56Context *alpha_context;
yading@10: 
yading@10:     VP56Model *modelp;
yading@10:     VP56Model model;
yading@10: 
yading@10:     /* huffman decoding */
yading@10:     int use_huffman;
yading@10:     GetBitContext gb;
yading@10:     VLC dccv_vlc[2];
yading@10:     VLC runv_vlc[2];
yading@10:     VLC ract_vlc[2][3][6];
yading@10:     unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */
yading@10: };
yading@10: 
yading@10: 
yading@10: int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
yading@10: int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
yading@10:                           int flip, int has_alpha);
yading@10: int ff_vp56_free(AVCodecContext *avctx);
yading@10: int ff_vp56_free_context(VP56Context *s);
yading@10: void ff_vp56_init_dequant(VP56Context *s, int quantizer);
yading@10: int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                          AVPacket *avpkt);
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * vp56 specific range coder implementation
yading@10:  */
yading@10: 
yading@10: extern const uint8_t ff_vp56_norm_shift[256];
yading@10: void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
yading@10: 
yading@10: static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
yading@10: {
yading@10:     int shift = ff_vp56_norm_shift[c->high];
yading@10:     int bits = c->bits;
yading@10:     unsigned int code_word = c->code_word;
yading@10: 
yading@10:     c->high   <<= shift;
yading@10:     code_word <<= shift;
yading@10:     bits       += shift;
yading@10:     if(bits >= 0 && c->buffer < c->end) {
yading@10:         code_word |= bytestream_get_be16(&c->buffer) << bits;
yading@10:         bits -= 16;
yading@10:     }
yading@10:     c->bits = bits;
yading@10:     return code_word;
yading@10: }
yading@10: 
yading@10: #if   ARCH_ARM
yading@10: #include "arm/vp56_arith.h"
yading@10: #elif ARCH_X86
yading@10: #include "x86/vp56_arith.h"
yading@10: #endif
yading@10: 
yading@10: #ifndef vp56_rac_get_prob
yading@10: #define vp56_rac_get_prob vp56_rac_get_prob
yading@10: static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
yading@10: {
yading@10:     unsigned int code_word = vp56_rac_renorm(c);
yading@10:     unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
yading@10:     unsigned int low_shift = low << 16;
yading@10:     int bit = code_word >= low_shift;
yading@10: 
yading@10:     c->high = bit ? c->high - low : low;
yading@10:     c->code_word = bit ? code_word - low_shift : code_word;
yading@10: 
yading@10:     return bit;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: #ifndef vp56_rac_get_prob_branchy
yading@10: // branchy variant, to be used where there's a branch based on the bit decoded
yading@10: static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
yading@10: {
yading@10:     unsigned long code_word = vp56_rac_renorm(c);
yading@10:     unsigned low = 1 + (((c->high - 1) * prob) >> 8);
yading@10:     unsigned low_shift = low << 16;
yading@10: 
yading@10:     if (code_word >= low_shift) {
yading@10:         c->high     -= low;
yading@10:         c->code_word = code_word - low_shift;
yading@10:         return 1;
yading@10:     }
yading@10: 
yading@10:     c->high = low;
yading@10:     c->code_word = code_word;
yading@10:     return 0;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
yading@10: {
yading@10:     unsigned int code_word = vp56_rac_renorm(c);
yading@10:     /* equiprobable */
yading@10:     int low = (c->high + 1) >> 1;
yading@10:     unsigned int low_shift = low << 16;
yading@10:     int bit = code_word >= low_shift;
yading@10:     if (bit) {
yading@10:         c->high   -= low;
yading@10:         code_word -= low_shift;
yading@10:     } else {
yading@10:         c->high = low;
yading@10:     }
yading@10: 
yading@10:     c->code_word = code_word;
yading@10:     return bit;
yading@10: }
yading@10: 
yading@10: // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
yading@10: static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
yading@10: {
yading@10:     return vp56_rac_get_prob(c, 128);
yading@10: }
yading@10: 
yading@10: static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
yading@10: {
yading@10:     int value = 0;
yading@10: 
yading@10:     while (bits--) {
yading@10:         value = (value << 1) | vp56_rac_get(c);
yading@10:     }
yading@10: 
yading@10:     return value;
yading@10: }
yading@10: 
yading@10: static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
yading@10: {
yading@10:     int value = 0;
yading@10: 
yading@10:     while (bits--) {
yading@10:         value = (value << 1) | vp8_rac_get(c);
yading@10:     }
yading@10: 
yading@10:     return value;
yading@10: }
yading@10: 
yading@10: // fixme: add 1 bit to all the calls to this?
yading@10: static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
yading@10: {
yading@10:     int v;
yading@10: 
yading@10:     if (!vp8_rac_get(c))
yading@10:         return 0;
yading@10: 
yading@10:     v = vp8_rac_get_uint(c, bits);
yading@10: 
yading@10:     if (vp8_rac_get(c))
yading@10:         v = -v;
yading@10: 
yading@10:     return v;
yading@10: }
yading@10: 
yading@10: // P(7)
yading@10: static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
yading@10: {
yading@10:     int v = vp56_rac_gets(c, 7) << 1;
yading@10:     return v + !v;
yading@10: }
yading@10: 
yading@10: static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
yading@10: {
yading@10:     int v = vp8_rac_get_uint(c, 7) << 1;
yading@10:     return v + !v;
yading@10: }
yading@10: 
yading@10: static av_always_inline
yading@10: int vp56_rac_get_tree(VP56RangeCoder *c,
yading@10:                       const VP56Tree *tree,
yading@10:                       const uint8_t *probs)
yading@10: {
yading@10:     while (tree->val > 0) {
yading@10:         if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
yading@10:             tree += tree->val;
yading@10:         else
yading@10:             tree++;
yading@10:     }
yading@10:     return -tree->val;
yading@10: }
yading@10: 
yading@10: // how probabilities are associated with decisions is different I think
yading@10: // well, the new scheme fits in the old but this way has one fewer branches per decision
yading@10: static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
yading@10:                                    const uint8_t *probs)
yading@10: {
yading@10:     int i = 0;
yading@10: 
yading@10:     do {
yading@10:         i = tree[i][vp56_rac_get_prob(c, probs[i])];
yading@10:     } while (i > 0);
yading@10: 
yading@10:     return -i;
yading@10: }
yading@10: 
yading@10: // DCTextra
yading@10: static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
yading@10: {
yading@10:     int v = 0;
yading@10: 
yading@10:     do {
yading@10:         v = (v<<1) + vp56_rac_get_prob(c, *prob++);
yading@10:     } while (*prob);
yading@10: 
yading@10:     return v;
yading@10: }
yading@10: 
yading@10: #endif /* AVCODEC_VP56_H */