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FFmpeg/libavcodec/vp56.h
Peter Ross 492a3b4b89 avcodec/vp56: decode interlace content 
Modification of patch submitted by Aurelien Jacobs (November 2007).

Fixes ticket #5581 and #5582.
2024-10-31 17:49:48 +11:00

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/*
* 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 "libavutil/mem_internal.h"
#include "avcodec.h"
#include "get_bits.h"
#include "hpeldsp.h"
#include "h264chroma.h"
#include "videodsp.h"
#include "vp3dsp.h"
#include "vp56dsp.h"
#include "vpx_rac.h"
typedef struct vp56_context VP56Context;
typedef enum {
VP56_FRAME_NONE =-1,
VP56_FRAME_CURRENT = 0,
VP56_FRAME_PREVIOUS = 1,
VP56_FRAME_GOLDEN = 2,
} VP56Frame;
typedef enum {
VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
VP56_MB_INTRA = 1, /**< Intra MB */
VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
} VP56mb;
typedef struct VP56Tree {
int8_t val;
int8_t prob_idx;
} VP56Tree;
typedef struct VP56mv {
DECLARE_ALIGNED(4, int16_t, x);
int16_t y;
} VP56mv;
#define VP56_SIZE_CHANGE 1
typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
VP56mv *vect);
typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
int offset1, int offset2, ptrdiff_t stride,
VP56mv mv, int mask, int select, int luma);
typedef int (*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 VP56RefDc {
uint8_t not_null_dc;
VP56Frame ref_frame;
int16_t 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 coeff_index_to_idct_selector[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;
H264ChromaContext h264chroma;
HpelDSPContext hdsp;
VideoDSPContext vdsp;
VP3DSPContext vp3dsp;
VP56DSPContext vp56dsp;
uint8_t idct_scantable[64];
AVFrame *frames[4];
uint8_t *edge_emu_buffer_alloc;
uint8_t *edge_emu_buffer;
VPXRangeCoder c;
VPXRangeCoder cc;
VPXRangeCoder *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;
/* DC predictors management */
VP56RefDc *above_blocks;
VP56RefDc left_block[4];
int above_block_idx[6];
int16_t prev_dc[3][3]; /* [plan][ref_frame] */
/* blocks / macroblock */
VP56mb mb_type;
VP56Macroblock *macroblocks;
DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
int idct_selector[6];
const uint8_t *def_coeff_reorder;/* used in vp6 only */
/* 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;
DECLARE_ALIGNED(8, int, bounding_values_array)[256];
uint8_t coeff_ctx[4][64]; /* used in vp5 only */
uint8_t coeff_ctx_last[4]; /* used in vp5 only */
int has_alpha;
/* interlacing params */
int interlaced;
int il_prob;
int il_block;
/* 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 */
ptrdiff_t 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 */
int have_undamaged_frame;
int discard_frame;
};
/**
* Initializes an VP56Context. Expects its caller to clean up
* in case of error.
*/
int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
int flip, int has_alpha);
int ff_vp56_free_context(VP56Context *s);
void ff_vp56_init_dequant(VP56Context *s, int quantizer);
int ff_vp56_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt);
/**
* vp56 specific range coder implementation
*/
static int vp56_rac_gets(VPXRangeCoder *c, int bits)
{
int value = 0;
while (bits--) {
value = (value << 1) | vpx_rac_get(c);
}
return value;
}
// P(7)
static av_unused int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
{
int v = vp56_rac_gets(c, 7) << 1;
return v + !v;
}
static av_always_inline
int vp56_rac_get_tree(VPXRangeCoder *c,
const VP56Tree *tree,
const uint8_t *probs)
{
while (tree->val > 0) {
if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
tree += tree->val;
else
tree++;
}
return -tree->val;
}
#endif /* AVCODEC_VP56_H */
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