📄 mavrix_chang_log.txt
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2007-01-21 本次对xvid的解码器改动比较大，为了较为详细的记录改动的信息，使用中文抒写
修改作者：武海滨
修改记录：这个修改是从上一次的版本中，提取相关函数和宏结构体变量声明保存到相关的
.c .h文件中，真正的作到了纯C语言的版本，不依赖与编译平台和编译宏来实现
这些文件有(所有文件名和文件都是暂定义)：
MVStruct.h:定义了解码器所需要的结构体，如DECODER等
MVMacro.h:定义了解码器所需要的宏定义
MVGlobal.h:定义了一些数据类型
MVCommon.h MVCommon.c 实现了宏块反量化函数和反量化矩阵等一般函数的定义和声明
MVTablle.c定义了解码器一些 VLC表
MVIdct.h MVIdct.c 包含IDCT的函数的声明和使用
MVBitstream.h 和MVBitstream.c 文件包括了关于字节流的操作函数
MVBlock.h和MVBlock.c 文件包括了对块操作的函数定义和声明
MVMb.h MVMb.c 包含了关于宏块操作函数的声明和使用
MVVolVop.h MVVolVop.c 包含了读VOL和VOP函数声明和定义
MVMv.h MvMv.c 包含了求运动向量的函数的声明和定义
MVMc.h MVMc.c 包含了运动补偿的函数声明和定义
MVMemoryalloc.h MVMemoryalloc.c包含分配内存给解码器的函数声明和定义
MVImage.h MVImage.c包含了图象输出和拷贝交换等操作函数。
MVDecodec.h MVDecodec.c包含了解码器的接口函数
MVStruct.h：包括的内容有：IMAGE定义 VECTOR定义 WARPPOINTS定义 GMC_DATA定义
NEW_GMC_DATA定义 Bitstream定义 MACROBLOCK定义 VLC定义
EVENT定义 REVERSE_EVENT定义 VLC_TABLE定义 xvid_image_t定义
xvid_gbl_info_t定义 xvid_gbl_convert_t定义 xvid_dec_create_t定义
xvid_dec_frame_t定义 xvid_dec_stats_t定义 DECODER定义
MVMacro.h:包含的宏有： MBPRED_SIZE XVID_GBL_INIT XVID_GBL_INFO
XVID_GBL_CONVERT XVID_DEC_CREATE XVID_DEC_DESTROY
XVID_DEC_DECODE MODE_INTER MODE_INTER_Q
MODE_INTER4V MODE_INTRA MODE_INTRA_Q MODE_NOT_CODED
MODE_NOT_CODED_GMC MODE_DIRECT MODE_INTERPOLATE
MODE_BACKWARD MODE_FORWARD MODE_DIRECT_NONE_MV
MODE_DIRECT_NO4V I_VOP P_VOP
B_VOP S_VOP N_VOP
XVID_CSP_PLANAR XVID_CSP_USER XVID_CSP_PLANAR
XVID_CSP_I420 XVID_CSP_YV12 XVID_CSP_YUY2
XVID_CSP_UYVY XVID_CSP_YVYU XVID_CSP_BGRA
XVID_CSP_ABGR XVID_CSP_RGBA XVID_CSP_ARGB
XVID_CSP_BGR XVID_CSP_RGB555 XVID_CSP_RGB565
XVID_CSP_SLICE XVID_CSP_INTERNAL XVID_CSP_NULL
XVID_CSP_VFLIP XVID_ERR_FAIL XVID_ERR_MEMORY
XVID_ERR_FORMAT XVID_ERR_VERSION XVID_ERR_END
VIDOBJLAY_START_CODE VOP_START_CODE VIDOBJLAY_SHAPE_RECTANGULAR
VIDOBJLAY_SHAPE_BINARY VIDOBJLAY_SHAPE_BINARY_ONLY
VIDOBJLAY_SHAPE_GRAYSCALE SPRITE_NONE
SPRITE_STATIC SPRITE_GMC NUMBITS_VP_RESYNC_MARKER
RESYNC_MARKER VLC_ERROR ESCAPE
ESCAPE1 ESCAPE2 ESCAPE3
MIN(X, Y) MAX(X, Y) SIGN(X)
CLIP(X,AMIN,AMAX) DIV_DIV(a,b) SWAP(_T_,A,B)
BSWAP(a) DIV2ROUND(n) DIV2(n)
DIVUVMOV(n) GET_BITS(cache, n) EDGE_SIZE
BS_VERSION_BUGGY_DC_CLIPPING VM18P
VM18Q SCALEBITS FIX(X)
SAFETY EDGE_SIZE2 MLT(i)
RSHIFT(a,b) RDIV(a,b) DIV2ROUND(n)
BS_VERSION_BUGGY_CHROMA_ROUNDING VIDOBJLAY_AR_EXTPAR
LEVELOFFSET READ_MARKER()
MVGlobal.h 定义有： int8_t uint8_t int16_t
uint16_t int32_t uint32_t
int64_t uint64_t CACHE_LINE
ptr_t intptr_t
MVCommon.h MVCommon.c ：定义的函数有 mavrix_fine_start_code(Bitstream * bs);
log2bin(uint32_t value);
get_intra_matrix(const uint16_t * mpeg_quant_matrices);
get_inter_matrix(const uint16_t * mpeg_quant_matrices);
get_default_intra_matrix(void);
get_default_inter_matrix(void);
set_intra_matrix(uint16_t * mpeg_quant_matrices, const uint8_t * matrix);
set_inter_matrix(uint16_t * mpeg_quant_matrices, const uint8_t * matrix);
bs_get_spritetrajectory(Bitstream * bs);
check_resync_marker(Bitstream * bs, int addbits);
get_dc_scaler(uint32_t quant, uint32_t lum);
quant_h263_intra(int16_t * coeff, const int16_t * data,
const uint32_t quant, const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices);
dequant_h263_intra(int16_t * data, const int16_t * coeff,
const uint32_t quant, const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices);
quant_mpeg_intra(int16_t * coeff, const int16_t * data,
const uint32_t quant, const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices);
quant_mpeg_inter(int16_t * coeff, const int16_t * data,
const uint32_t quant, const uint16_t * mpeg_quant_matrices);
dequant_mpeg_intra(int16_t * data, const int16_t * coeff,
const uint32_t quant, const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices);
dequant_mpeg_inter(int16_t * data, const int16_t * coeff,
const uint32_t quant, const uint16_t * mpeg_quant_matrices);
init_mpeg_matrix(uint16_t * mpeg_quant_matrices);
MVTablle.c：定义了： VLC coeff_VLC[2][2][64][64] VLC_TABLE const coeff_tab[2][102]
uint8_t const max_level[2][2][64] uint8_t const max_run[2][2][64]
VLC sprite_trajectory_code[32768] VLC sprite_trajectory_len[15]
VLC mcbpc_intra_tab[15] VLC mcbpc_inter_tab[29]
const VLC xvid_cbpy_tab[16] VLC dcy_tab[511]
const VLC dcc_tab[511] const VLC mb_motion_table[65]
VLC const mcbpc_intra_table[64] VLC const mcbpc_inter_table[257]
VLC const cbpy_table[64] VLC const TMNMVtab0[]
VLC const TMNMVtab1[] VLC const TMNMVtab2[]
short const dc_threshold[] VLC const dc_lum_tab[]
const uint16_t scan_tables[3][64] const uint8_t default_intra_matrix[64]
const uint8_t default_inter_matrix[64]
const uint32_t intra_dc_threshold_table[8]
const int16_t default_acdc_values[15]
REVERSE_EVENT DCT3D[2][4096] const uint32_t multipliers[32]
const uint32_t MTab[16] const int32_t dquant_table[4]
const uint32_t roundtab_79[4] const uint32_t roundtab_76[16]
const int32_t FIR_Tab_8[9][8]
函数： void init_vlc_tables(void)
MVIdct.h MVIdct.c 定义的函数有：
void idct_int32_init(void); void idct_int32(short *const block)
MVBitstream.h 和MVBitstream.c定义和实现的函数有：
void BitstreamInit(Bitstream * const bs, void *const bitstream,uint32_t length)
uint32_t BitstreamShowBits(Bitstream * const bs, const uint32_t bits)
void BitstreamSkip(Bitstream * const bs, const uint32_t bits)
uint32_t BitstreamGetBits(Bitstream * const bs,const uint32_t n)
uint32_t BitstreamGetBit(Bitstream * const bs)
uint32_t BitstreamNumBitsToByteAlign(Bitstream *bs)
uint32_t BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
void BitstreamByteAlign(Bitstream * const bs)
uint32_t BitstreamPos(const Bitstream * const bs)
void bs_get_matrix(Bitstream * bs, uint8_t * matrix);
int32_t get_dbquant(Bitstream * bs);
MVBlock.h和MVBlock.c定义和实现的函数有：
void get_intra_block(Bitstream * bs, int16_t * block,int direction, int coeff);
void get_inter_block_h263(Bitstream * bs, int16_t * block,
int direction, const int quant,
const uint16_t *matrix);
void get_inter_block_mpeg(Bitstream * bs,int16_t * block,
int direction, const int quant,
const uint16_t *matrix);
MVMb.h MVMb.c 定义和实现的函数有：
int rescale(int predict_quant, int current_quant, int coeff)
int get_mcbpc_intra(Bitstream * bs);
int get_mcbpc_inter(Bitstream * bs);
int get_cbpy(Bitstream * bs, int intra);
int32_t get_mbtype(Bitstream * bs);
int get_dc_size_lum(Bitstream * bs);
int get_dc_size_chrom(Bitstream * bs);
int get_dc_dif(Bitstream * bs, uint32_t dc_size);
void predict_acdc(MACROBLOCK * pMBs, uint32_t x, uint32_t y,uint32_t mb_width,
uint32_t block, int16_t qcoeff[64], uint32_t current_quant,
int32_t iDcScaler, int16_t predictors[8], const int bound);
void add_acdc(MACROBLOCK * pMB, uint32_t block, int16_t dct_codes[64],
uint32_t iDcScaler,int16_t predictors[8], const int bsversion);
void decoder_mbintra(DECODER * dec,MACROBLOCK * pMB, const uint32_t x_pos,
const uint32_t y_pos,const uint32_t acpred_flag,
const uint32_t cbp,Bitstream * bs,const uint32_t quant,
const uint32_t intra_dc_threshold,const unsigned int bound);
void decoder_mbinter(DECODER * dec,const MACROBLOCK * pMB,const uint32_t x_pos,
const uint32_t y_pos,const uint32_t cbp,Bitstream * bs,
const uint32_t rounding, const int ref,const int bvop);
void decoder_mb_decode(DECODER * dec, const uint32_t cbp,Bitstream * bs,
uint8_t * pY_Cur, uint8_t * pU_Cur,uint8_t * pV_Cur,
const MACROBLOCK * pMB);
void decoder_mbinter_field(DECODER * dec,const MACROBLOCK * pMB,const uint32_t x_pos,
const uint32_t y_pos, const uint32_t cbp,Bitstream * bs,
const uint32_t rounding, const int ref, const int bvop);
void decoder_mbgmc(DECODER * dec, MACROBLOCK * const pMB, const uint32_t x_pos,
const uint32_t y_pos, const uint32_t fcode, const uint32_t cbp,
Bitstream * bs, const uint32_t rounding);
void decoder_bf_interpolate_mbinter(DECODER * dec,IMAGE forward,IMAGE backward,
MACROBLOCK * pMB,const uint32_t x_pos, const uint32_t y_pos,
Bitstream * bs, const int direct);
MVVolVop.h MVVolVop.c 包含了函数有：
int mavrix_read_vol(Bitstream * bs,DECODER * dec,uint32_t * rounding,
uint32_t * quant,uint32_t * fcode_forward,
uint32_t * fcode_backward, uint32_t * intra_dc_threshold,
WARPPOINTS *gmc_warp);
int mavtrix_read_vop(Bitstream * bs,DECODER * dec,uint32_t * rounding,
uint32_t * quant,uint32_t * fcode_forward,
uint32_t * fcode_backward,uint32_t * intra_dc_threshold,
WARPPOINTS *gmc_warp);
int read_video_packet_header(Bitstream *bs,DECODER * dec, const int addbits,
int * quant，int * fcode_forward,int * fcode_backward,
int * intra_dc_threshold);
void decoder_iframe(DECODER * dec, Bitstream * bs, int quant,
int intra_dc_threshold);
void decoder_pframe(DECODER * dec, Bitstream * bs,int rounding,
int quant, int fcode, int intra_dc_threshold,
const WARPPOINTS *const gmc_warp);
void decoder_bframe(DECODER * dec,Bitstream * bs,int quant,
int fcode_forward, int fcode_backward);
MVMv.h MvMv.c 包含函数有：
void __inline validate_vector(VECTOR * mv, unsigned int x_pos, unsigned int y_pos, const DECODER * dec)
VECTOR get_pmv2_interlaced(const MACROBLOCK * const mbs, const int mb_width,
const int bound, const int x, const int y,const int block);
int get_mv(Bitstream * bs, int fcode);
VECTOR get_pmv2(const MACROBLOCK * const mbs,const int mb_width,
const int bound,const int x,const int y,const int block);
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