зеркало из https://github.com/mozilla/gecko-dev.git
257 строки
7.8 KiB
C
257 строки
7.8 KiB
C
/*
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* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* VP5 and VP6 compatible video decoder (common features)
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*/
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#ifndef AVCODEC_VP56_H
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#define AVCODEC_VP56_H
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "hpeldsp.h"
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#include "h264chroma.h"
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#include "videodsp.h"
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#include "vp3dsp.h"
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#include "vp56dsp.h"
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#include "vpx_rac.h"
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typedef struct vp56_context VP56Context;
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typedef enum {
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VP56_FRAME_NONE =-1,
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VP56_FRAME_CURRENT = 0,
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VP56_FRAME_PREVIOUS = 1,
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VP56_FRAME_GOLDEN = 2,
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} VP56Frame;
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typedef enum {
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VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
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VP56_MB_INTRA = 1, /**< Intra MB */
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VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
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VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
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VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
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VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
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VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
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VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
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VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
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VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
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} VP56mb;
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typedef struct VP56Tree {
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int8_t val;
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int8_t prob_idx;
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} VP56Tree;
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typedef struct VP56mv {
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DECLARE_ALIGNED(4, int16_t, x);
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int16_t y;
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} VP56mv;
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#define VP56_SIZE_CHANGE 1
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typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
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VP56mv *vect);
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typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
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int offset1, int offset2, ptrdiff_t stride,
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VP56mv mv, int mask, int select, int luma);
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typedef int (*VP56ParseCoeff)(VP56Context *s);
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typedef void (*VP56DefaultModelsInit)(VP56Context *s);
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typedef void (*VP56ParseVectorModels)(VP56Context *s);
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typedef int (*VP56ParseCoeffModels)(VP56Context *s);
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typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
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int buf_size);
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typedef struct VP56RefDc {
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uint8_t not_null_dc;
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VP56Frame ref_frame;
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int16_t dc_coeff;
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} VP56RefDc;
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typedef struct VP56Macroblock {
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uint8_t type;
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VP56mv mv;
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} VP56Macroblock;
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typedef struct VP56Model {
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uint8_t coeff_reorder[64]; /* used in vp6 only */
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uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
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uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
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uint8_t vector_sig[2]; /* delta sign */
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uint8_t vector_dct[2]; /* delta coding types */
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uint8_t vector_pdi[2][2]; /* predefined delta init */
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uint8_t vector_pdv[2][7]; /* predefined delta values */
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uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
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uint8_t coeff_dccv[2][11]; /* DC coeff value */
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uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
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uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
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uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
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uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
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uint8_t mb_type[3][10][10]; /* model for decoding MB type */
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uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
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} VP56Model;
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struct vp56_context {
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AVCodecContext *avctx;
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H264ChromaContext h264chroma;
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HpelDSPContext hdsp;
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VideoDSPContext vdsp;
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VP3DSPContext vp3dsp;
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VP56DSPContext vp56dsp;
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uint8_t idct_scantable[64];
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AVFrame *frames[4];
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uint8_t *edge_emu_buffer_alloc;
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uint8_t *edge_emu_buffer;
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VPXRangeCoder c;
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VPXRangeCoder cc;
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VPXRangeCoder *ccp;
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int sub_version;
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/* frame info */
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int golden_frame;
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int plane_width[4];
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int plane_height[4];
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int mb_width; /* number of horizontal MB */
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int mb_height; /* number of vertical MB */
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int block_offset[6];
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int quantizer;
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uint16_t dequant_dc;
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uint16_t dequant_ac;
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/* DC predictors management */
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VP56RefDc *above_blocks;
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VP56RefDc left_block[4];
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int above_block_idx[6];
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int16_t prev_dc[3][3]; /* [plan][ref_frame] */
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/* blocks / macroblock */
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VP56mb mb_type;
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VP56Macroblock *macroblocks;
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DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
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int idct_selector[6];
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/* motion vectors */
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VP56mv mv[6]; /* vectors for each block in MB */
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VP56mv vector_candidate[2];
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int vector_candidate_pos;
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/* filtering hints */
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int filter_header; /* used in vp6 only */
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int deblock_filtering;
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int filter_selection;
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int filter_mode;
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int max_vector_length;
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int sample_variance_threshold;
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DECLARE_ALIGNED(8, int, bounding_values_array)[256];
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uint8_t coeff_ctx[4][64]; /* used in vp5 only */
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uint8_t coeff_ctx_last[4]; /* used in vp5 only */
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int has_alpha;
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/* upside-down flipping hints */
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int flip; /* are we flipping ? */
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int frbi; /* first row block index in MB */
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int srbi; /* second row block index in MB */
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ptrdiff_t stride[4]; /* stride for each plan */
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const uint8_t *vp56_coord_div;
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VP56ParseVectorAdjustment parse_vector_adjustment;
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VP56Filter filter;
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VP56ParseCoeff parse_coeff;
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VP56DefaultModelsInit default_models_init;
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VP56ParseVectorModels parse_vector_models;
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VP56ParseCoeffModels parse_coeff_models;
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VP56ParseHeader parse_header;
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/* for "slice" parallelism between YUV and A */
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VP56Context *alpha_context;
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VP56Model *modelp;
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VP56Model model;
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/* huffman decoding */
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int use_huffman;
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GetBitContext gb;
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VLC dccv_vlc[2];
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VLC runv_vlc[2];
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VLC ract_vlc[2][3][6];
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unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
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int have_undamaged_frame;
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int discard_frame;
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};
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/**
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* Initializes an VP56Context. Expects its caller to clean up
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* in case of error.
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*/
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int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
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int flip, int has_alpha);
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int ff_vp56_free_context(VP56Context *s);
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void ff_vp56_init_dequant(VP56Context *s, int quantizer);
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int ff_vp56_decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt);
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/**
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* vp56 specific range coder implementation
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*/
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static int vp56_rac_gets(VPXRangeCoder *c, int bits)
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{
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int value = 0;
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while (bits--) {
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value = (value << 1) | vpx_rac_get(c);
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}
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return value;
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}
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// P(7)
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static av_unused int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
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{
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int v = vp56_rac_gets(c, 7) << 1;
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return v + !v;
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}
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static av_always_inline
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int vp56_rac_get_tree(VPXRangeCoder *c,
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const VP56Tree *tree,
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const uint8_t *probs)
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{
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while (tree->val > 0) {
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if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
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tree += tree->val;
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else
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tree++;
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}
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return -tree->val;
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}
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#endif /* AVCODEC_VP56_H */
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