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https://git.videolan.org/git/ffmpeg.git
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![Michael Niedermayer](/assets/img/avatar_default.png)
A threshold of 1 is sufficient for simple_dump_cut.webm, 10 is used just to be sure the next truncated file doesnt cause the same issue Obvious alternative fixes are to simply accept that the file is broken or to write some advanced error concealment or to simply accept that the decoder wont stop at the end of input. Fixes: Ticket 8069 (artifacts not the differing md5 which was there before1afd246960
) Fixes: simple_dump_cut.webm Fixes: regression of1afd246960
fate-vp5 changes because the last frame is truncated and now handled differently. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
419 lines
12 KiB
C
419 lines
12 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 "avcodec.h"
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#include "get_bits.h"
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#include "hpeldsp.h"
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#include "bytestream.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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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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VP56_FRAME_GOLDEN2 = 3,
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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 VP56RangeCoder {
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int high;
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int bits; /* stored negated (i.e. negative "bits" is a positive number of
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bits left) in order to eliminate a negate in cache refilling */
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const uint8_t *buffer;
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const uint8_t *end;
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unsigned int code_word;
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int end_reached;
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} VP56RangeCoder;
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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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VP56RangeCoder c;
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VP56RangeCoder cc;
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VP56RangeCoder *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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int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
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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(AVCodecContext *avctx);
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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, void *data, int *got_frame,
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AVPacket *avpkt);
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/**
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* vp56 specific range coder implementation
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*/
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extern const uint8_t ff_vp56_norm_shift[256];
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int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
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/**
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* vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
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*/
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static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
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{
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if (c->end <= c->buffer && c->bits >= 0)
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c->end_reached ++;
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return c->end_reached > 10;
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}
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static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
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{
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int shift = ff_vp56_norm_shift[c->high];
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int bits = c->bits;
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unsigned int code_word = c->code_word;
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c->high <<= shift;
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code_word <<= shift;
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bits += shift;
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if(bits >= 0 && c->buffer < c->end) {
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code_word |= bytestream_get_be16(&c->buffer) << bits;
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bits -= 16;
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}
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c->bits = bits;
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return code_word;
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}
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#if ARCH_ARM
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#include "arm/vp56_arith.h"
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#elif ARCH_X86
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#include "x86/vp56_arith.h"
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#endif
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#ifndef vp56_rac_get_prob
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#define vp56_rac_get_prob vp56_rac_get_prob
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static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
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{
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unsigned int code_word = vp56_rac_renorm(c);
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unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
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unsigned int low_shift = low << 16;
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int bit = code_word >= low_shift;
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c->high = bit ? c->high - low : low;
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c->code_word = bit ? code_word - low_shift : code_word;
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return bit;
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}
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#endif
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#ifndef vp56_rac_get_prob_branchy
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// branchy variant, to be used where there's a branch based on the bit decoded
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static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
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{
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unsigned long code_word = vp56_rac_renorm(c);
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unsigned low = 1 + (((c->high - 1) * prob) >> 8);
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unsigned low_shift = low << 16;
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if (code_word >= low_shift) {
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c->high -= low;
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c->code_word = code_word - low_shift;
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return 1;
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}
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c->high = low;
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c->code_word = code_word;
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return 0;
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}
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#endif
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static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
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{
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unsigned int code_word = vp56_rac_renorm(c);
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/* equiprobable */
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int low = (c->high + 1) >> 1;
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unsigned int low_shift = low << 16;
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int bit = code_word >= low_shift;
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if (bit) {
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c->high -= low;
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code_word -= low_shift;
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} else {
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c->high = low;
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}
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c->code_word = code_word;
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return bit;
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}
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// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
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static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
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{
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return vp56_rac_get_prob(c, 128);
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}
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static int vp56_rac_gets(VP56RangeCoder *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) | vp56_rac_get(c);
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}
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return value;
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}
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static int vp8_rac_get_uint(VP56RangeCoder *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) | vp8_rac_get(c);
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}
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return value;
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}
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// fixme: add 1 bit to all the calls to this?
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static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
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{
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int v;
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if (!vp8_rac_get(c))
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return 0;
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v = vp8_rac_get_uint(c, bits);
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if (vp8_rac_get(c))
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v = -v;
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return v;
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}
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// P(7)
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static av_unused int vp56_rac_gets_nn(VP56RangeCoder *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_unused int vp8_rac_get_nn(VP56RangeCoder *c)
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{
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int v = vp8_rac_get_uint(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(VP56RangeCoder *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 (vp56_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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// how probabilities are associated with decisions is different I think
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// well, the new scheme fits in the old but this way has one fewer branches per decision
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static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
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const uint8_t *probs)
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{
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int i = 0;
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do {
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i = tree[i][vp56_rac_get_prob(c, probs[i])];
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} while (i > 0);
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return -i;
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}
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// DCTextra
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static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
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{
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int v = 0;
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do {
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v = (v<<1) + vp56_rac_get_prob(c, *prob++);
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} while (*prob);
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return v;
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}
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#endif /* AVCODEC_VP56_H */
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