• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/vp56.h

Go to the documentation of this file.
00001 
00024 #ifndef AVCODEC_VP56_H
00025 #define AVCODEC_VP56_H
00026 
00027 #include "vp56data.h"
00028 #include "dsputil.h"
00029 #include "get_bits.h"
00030 #include "bytestream.h"
00031 #include "vp56dsp.h"
00032 
00033 typedef struct vp56_context VP56Context;
00034 typedef struct vp56_mv VP56mv;
00035 
00036 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
00037                                           VP56mv *vect);
00038 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
00039                            int offset1, int offset2, int stride,
00040                            VP56mv mv, int mask, int select, int luma);
00041 typedef void (*VP56ParseCoeff)(VP56Context *s);
00042 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
00043 typedef void (*VP56ParseVectorModels)(VP56Context *s);
00044 typedef void (*VP56ParseCoeffModels)(VP56Context *s);
00045 typedef int  (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
00046                                 int buf_size, int *golden_frame);
00047 
00048 typedef struct {
00049     int high;
00050     int bits;
00051     const uint8_t *buffer;
00052     const uint8_t *end;
00053     unsigned long code_word;
00054 } VP56RangeCoder;
00055 
00056 typedef struct {
00057     uint8_t not_null_dc;
00058     VP56Frame ref_frame;
00059     DCTELEM dc_coeff;
00060 } VP56RefDc;
00061 
00062 struct vp56_mv {
00063     int x;
00064     int y;
00065 };
00066 
00067 typedef struct {
00068     uint8_t type;
00069     VP56mv mv;
00070 } VP56Macroblock;
00071 
00072 typedef struct {
00073     uint8_t coeff_reorder[64];       /* used in vp6 only */
00074     uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
00075     uint8_t vector_sig[2];           /* delta sign */
00076     uint8_t vector_dct[2];           /* delta coding types */
00077     uint8_t vector_pdi[2][2];        /* predefined delta init */
00078     uint8_t vector_pdv[2][7];        /* predefined delta values */
00079     uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
00080     uint8_t coeff_dccv[2][11];       /* DC coeff value */
00081     uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
00082     uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
00083     uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
00084     uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
00085     uint8_t mb_type[3][10][10];      /* model for decoding MB type */
00086     uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
00087 } VP56Model;
00088 
00089 struct vp56_context {
00090     AVCodecContext *avctx;
00091     DSPContext dsp;
00092     VP56DSPContext vp56dsp;
00093     ScanTable scantable;
00094     AVFrame frames[4];
00095     AVFrame *framep[6];
00096     uint8_t *edge_emu_buffer_alloc;
00097     uint8_t *edge_emu_buffer;
00098     VP56RangeCoder c;
00099     VP56RangeCoder cc;
00100     VP56RangeCoder *ccp;
00101     int sub_version;
00102 
00103     /* frame info */
00104     int plane_width[4];
00105     int plane_height[4];
00106     int mb_width;   /* number of horizontal MB */
00107     int mb_height;  /* number of vertical MB */
00108     int block_offset[6];
00109 
00110     int quantizer;
00111     uint16_t dequant_dc;
00112     uint16_t dequant_ac;
00113     int8_t *qscale_table;
00114 
00115     /* DC predictors management */
00116     VP56RefDc *above_blocks;
00117     VP56RefDc left_block[4];
00118     int above_block_idx[6];
00119     DCTELEM prev_dc[3][3];    /* [plan][ref_frame] */
00120 
00121     /* blocks / macroblock */
00122     VP56mb mb_type;
00123     VP56Macroblock *macroblocks;
00124     DECLARE_ALIGNED(16, DCTELEM, block_coeff)[6][64];
00125 
00126     /* motion vectors */
00127     VP56mv mv[6];  /* vectors for each block in MB */
00128     VP56mv vector_candidate[2];
00129     int vector_candidate_pos;
00130 
00131     /* filtering hints */
00132     int filter_header;               /* used in vp6 only */
00133     int deblock_filtering;
00134     int filter_selection;
00135     int filter_mode;
00136     int max_vector_length;
00137     int sample_variance_threshold;
00138 
00139     uint8_t coeff_ctx[4][64];              /* used in vp5 only */
00140     uint8_t coeff_ctx_last[4];             /* used in vp5 only */
00141 
00142     int has_alpha;
00143 
00144     /* upside-down flipping hints */
00145     int flip;  /* are we flipping ? */
00146     int frbi;  /* first row block index in MB */
00147     int srbi;  /* second row block index in MB */
00148     int stride[4];  /* stride for each plan */
00149 
00150     const uint8_t *vp56_coord_div;
00151     VP56ParseVectorAdjustment parse_vector_adjustment;
00152     VP56Filter filter;
00153     VP56ParseCoeff parse_coeff;
00154     VP56DefaultModelsInit default_models_init;
00155     VP56ParseVectorModels parse_vector_models;
00156     VP56ParseCoeffModels parse_coeff_models;
00157     VP56ParseHeader parse_header;
00158 
00159     VP56Model *modelp;
00160     VP56Model models[2];
00161 
00162     /* huffman decoding */
00163     int use_huffman;
00164     GetBitContext gb;
00165     VLC dccv_vlc[2];
00166     VLC runv_vlc[2];
00167     VLC ract_vlc[2][3][6];
00168     unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */
00169 };
00170 
00171 
00172 void vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
00173 int vp56_free(AVCodecContext *avctx);
00174 void vp56_init_dequant(VP56Context *s, int quantizer);
00175 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00176                       AVPacket *avpkt);
00177 
00178 
00183 static inline void vp56_init_range_decoder(VP56RangeCoder *c,
00184                                            const uint8_t *buf, int buf_size)
00185 {
00186     c->high = 255;
00187     c->bits = 8;
00188     c->buffer = buf;
00189     c->end = buf + buf_size;
00190     c->code_word = bytestream_get_be16(&c->buffer);
00191 }
00192 
00193 static inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
00194 {
00195     unsigned int low = 1 + (((c->high - 1) * prob) / 256);
00196     unsigned int low_shift = low << 8;
00197     int bit = c->code_word >= low_shift;
00198 
00199     if (bit) {
00200         c->high -= low;
00201         c->code_word -= low_shift;
00202     } else {
00203         c->high = low;
00204     }
00205 
00206     /* normalize */
00207     while (c->high < 128) {
00208         c->high <<= 1;
00209         c->code_word <<= 1;
00210         if (--c->bits == 0 && c->buffer < c->end) {
00211             c->bits = 8;
00212             c->code_word |= *c->buffer++;
00213         }
00214     }
00215     return bit;
00216 }
00217 
00218 static inline int vp56_rac_get(VP56RangeCoder *c)
00219 {
00220     /* equiprobable */
00221     int low = (c->high + 1) >> 1;
00222     unsigned int low_shift = low << 8;
00223     int bit = c->code_word >= low_shift;
00224     if (bit) {
00225         c->high = (c->high - low) << 1;
00226         c->code_word -= low_shift;
00227     } else {
00228         c->high = low << 1;
00229     }
00230 
00231     /* normalize */
00232     c->code_word <<= 1;
00233     if (--c->bits == 0 && c->buffer < c->end) {
00234         c->bits = 8;
00235         c->code_word |= *c->buffer++;
00236     }
00237     return bit;
00238 }
00239 
00240 static inline int vp56_rac_gets(VP56RangeCoder *c, int bits)
00241 {
00242     int value = 0;
00243 
00244     while (bits--) {
00245         value = (value << 1) | vp56_rac_get(c);
00246     }
00247 
00248     return value;
00249 }
00250 
00251 static inline int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
00252 {
00253     int v = vp56_rac_gets(c, 7) << 1;
00254     return v + !v;
00255 }
00256 
00257 static inline int vp56_rac_get_tree(VP56RangeCoder *c,
00258                                     const VP56Tree *tree,
00259                                     const uint8_t *probs)
00260 {
00261     while (tree->val > 0) {
00262         if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
00263             tree += tree->val;
00264         else
00265             tree++;
00266     }
00267     return -tree->val;
00268 }
00269 
00270 #endif /* AVCODEC_VP56_H */

Generated on Fri Sep 16 2011 17:17:45 for FFmpeg by  doxygen 1.7.1