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ffmpeg/libavcodec/vp56.h

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/**
* @file 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 vp56_context_t;
typedef struct vp56_mv vp56_mv_t;
typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
vp56_mv_t *vect);
typedef int (*vp56_adjust_t)(int v, int t);
typedef void (*vp56_filter_t)(vp56_context_t *s, uint8_t *dst, uint8_t *src,
int offset1, int offset2, int stride,
vp56_mv_t mv, int mask, int select, int luma);
typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
typedef int (*vp56_parse_header_t)(vp56_context_t *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;
} vp56_range_coder_t;
typedef struct {
uint8_t not_null_dc;
vp56_frame_t ref_frame;
DCTELEM dc_coeff;
} vp56_ref_dc_t;
struct vp56_mv {
int x;
int y;
};
typedef struct {
uint8_t type;
vp56_mv_t mv;
} vp56_macroblock_t;
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 */
} vp56_model_t;
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;
vp56_range_coder_t c;
vp56_range_coder_t cc;
vp56_range_coder_t *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 */
vp56_ref_dc_t *above_blocks;
vp56_ref_dc_t left_block[4];
int above_block_idx[6];
DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
/* blocks / macroblock */
vp56_mb_t mb_type;
vp56_macroblock_t *macroblocks;
DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
/* motion vectors */
vp56_mv_t mv[6]; /* vectors for each block in MB */
vp56_mv_t 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;
vp56_parse_vector_adjustment_t parse_vector_adjustment;
vp56_adjust_t adjust;
vp56_filter_t filter;
vp56_parse_coeff_t parse_coeff;
vp56_default_models_init_t default_models_init;
vp56_parse_vector_models_t parse_vector_models;
vp56_parse_coeff_models_t parse_coeff_models;
vp56_parse_header_t parse_header;
vp56_model_t *modelp;
vp56_model_t 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(vp56_context_t *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(vp56_range_coder_t *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(vp56_range_coder_t *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(vp56_range_coder_t *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(vp56_range_coder_t *c, int bits)
{
int value = 0;
while (bits--) {
value = (value << 1) | vp56_rac_get(c);
}
return value;
}
static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
{
int v = vp56_rac_gets(c, 7) << 1;
return v + !v;
}
static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
const vp56_tree_t *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 */
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