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libavcodec/vp6.c

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00001 
00028 #include <stdlib.h>
00029 
00030 #include "avcodec.h"
00031 #include "dsputil.h"
00032 #include "get_bits.h"
00033 #include "huffman.h"
00034 
00035 #include "vp56.h"
00036 #include "vp56data.h"
00037 #include "vp6data.h"
00038 
00039 #define VP6_MAX_HUFF_SIZE 12
00040 
00041 static void vp6_parse_coeff(VP56Context *s);
00042 static void vp6_parse_coeff_huffman(VP56Context *s);
00043 
00044 static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
00045                             int *golden_frame)
00046 {
00047     VP56RangeCoder *c = &s->c;
00048     int parse_filter_info = 0;
00049     int coeff_offset = 0;
00050     int vrt_shift = 0;
00051     int sub_version;
00052     int rows, cols;
00053     int res = 0;
00054     int separated_coeff = buf[0] & 1;
00055 
00056     s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
00057     ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
00058 
00059     if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00060         sub_version = buf[1] >> 3;
00061         if (sub_version > 8)
00062             return AVERROR_INVALIDDATA;
00063         s->filter_header = buf[1] & 0x06;
00064         if (buf[1] & 1) {
00065             av_log_missing_feature(s->avctx, "Interlacing", 0);
00066             return AVERROR_PATCHWELCOME;
00067         }
00068         if (separated_coeff || !s->filter_header) {
00069             coeff_offset = AV_RB16(buf+2) - 2;
00070             buf += 2;
00071             buf_size -= 2;
00072         }
00073 
00074         rows = buf[2];  /* number of stored macroblock rows */
00075         cols = buf[3];  /* number of stored macroblock cols */
00076         /* buf[4] is number of displayed macroblock rows */
00077         /* buf[5] is number of displayed macroblock cols */
00078         if (!rows || !cols) {
00079             av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
00080             return AVERROR_INVALIDDATA;
00081         }
00082 
00083         if (!s->macroblocks || /* first frame */
00084             16*cols != s->avctx->coded_width ||
00085             16*rows != s->avctx->coded_height) {
00086             avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
00087             if (s->avctx->extradata_size == 1) {
00088                 s->avctx->width  -= s->avctx->extradata[0] >> 4;
00089                 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
00090             }
00091             res = VP56_SIZE_CHANGE;
00092         }
00093 
00094         ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
00095         vp56_rac_gets(c, 2);
00096 
00097         parse_filter_info = s->filter_header;
00098         if (sub_version < 8)
00099             vrt_shift = 5;
00100         s->sub_version = sub_version;
00101     } else {
00102         if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
00103             return AVERROR_INVALIDDATA;
00104 
00105         if (separated_coeff || !s->filter_header) {
00106             coeff_offset = AV_RB16(buf+1) - 2;
00107             buf += 2;
00108             buf_size -= 2;
00109         }
00110         ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
00111 
00112         *golden_frame = vp56_rac_get(c);
00113         if (s->filter_header) {
00114             s->deblock_filtering = vp56_rac_get(c);
00115             if (s->deblock_filtering)
00116                 vp56_rac_get(c);
00117             if (s->sub_version > 7)
00118                 parse_filter_info = vp56_rac_get(c);
00119         }
00120     }
00121 
00122     if (parse_filter_info) {
00123         if (vp56_rac_get(c)) {
00124             s->filter_mode = 2;
00125             s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
00126             s->max_vector_length = 2 << vp56_rac_gets(c, 3);
00127         } else if (vp56_rac_get(c)) {
00128             s->filter_mode = 1;
00129         } else {
00130             s->filter_mode = 0;
00131         }
00132         if (s->sub_version > 7)
00133             s->filter_selection = vp56_rac_gets(c, 4);
00134         else
00135             s->filter_selection = 16;
00136     }
00137 
00138     s->use_huffman = vp56_rac_get(c);
00139 
00140     s->parse_coeff = vp6_parse_coeff;
00141     if (coeff_offset) {
00142         buf      += coeff_offset;
00143         buf_size -= coeff_offset;
00144         if (buf_size < 0) {
00145             if (s->framep[VP56_FRAME_CURRENT]->key_frame)
00146                 avcodec_set_dimensions(s->avctx, 0, 0);
00147             return AVERROR_INVALIDDATA;
00148         }
00149         if (s->use_huffman) {
00150             s->parse_coeff = vp6_parse_coeff_huffman;
00151             init_get_bits(&s->gb, buf, buf_size<<3);
00152         } else {
00153             ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
00154             s->ccp = &s->cc;
00155         }
00156     } else {
00157         s->ccp = &s->c;
00158     }
00159 
00160     return res;
00161 }
00162 
00163 static void vp6_coeff_order_table_init(VP56Context *s)
00164 {
00165     int i, pos, idx = 1;
00166 
00167     s->modelp->coeff_index_to_pos[0] = 0;
00168     for (i=0; i<16; i++)
00169         for (pos=1; pos<64; pos++)
00170             if (s->modelp->coeff_reorder[pos] == i)
00171                 s->modelp->coeff_index_to_pos[idx++] = pos;
00172 }
00173 
00174 static void vp6_default_models_init(VP56Context *s)
00175 {
00176     VP56Model *model = s->modelp;
00177 
00178     model->vector_dct[0] = 0xA2;
00179     model->vector_dct[1] = 0xA4;
00180     model->vector_sig[0] = 0x80;
00181     model->vector_sig[1] = 0x80;
00182 
00183     memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
00184     memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
00185     memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
00186     memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
00187     memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
00188 
00189     vp6_coeff_order_table_init(s);
00190 }
00191 
00192 static void vp6_parse_vector_models(VP56Context *s)
00193 {
00194     VP56RangeCoder *c = &s->c;
00195     VP56Model *model = s->modelp;
00196     int comp, node;
00197 
00198     for (comp=0; comp<2; comp++) {
00199         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
00200             model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
00201         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
00202             model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
00203     }
00204 
00205     for (comp=0; comp<2; comp++)
00206         for (node=0; node<7; node++)
00207             if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
00208                 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
00209 
00210     for (comp=0; comp<2; comp++)
00211         for (node=0; node<8; node++)
00212             if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
00213                 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
00214 }
00215 
00216 /* nodes must ascend by count, but with descending symbol order */
00217 static int vp6_huff_cmp(const void *va, const void *vb)
00218 {
00219     const Node *a = va, *b = vb;
00220     return (a->count - b->count)*16 + (b->sym - a->sym);
00221 }
00222 
00223 static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
00224                                const uint8_t *map, unsigned size, VLC *vlc)
00225 {
00226     Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
00227     int a, b, i;
00228 
00229     /* first compute probabilities from model */
00230     tmp[0].count = 256;
00231     for (i=0; i<size-1; i++) {
00232         a = tmp[i].count *        coeff_model[i]  >> 8;
00233         b = tmp[i].count * (255 - coeff_model[i]) >> 8;
00234         nodes[map[2*i  ]].count = a + !a;
00235         nodes[map[2*i+1]].count = b + !b;
00236     }
00237 
00238     free_vlc(vlc);
00239     /* then build the huffman tree according to probabilities */
00240     return ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
00241                               FF_HUFFMAN_FLAG_HNODE_FIRST);
00242 }
00243 
00244 static int vp6_parse_coeff_models(VP56Context *s)
00245 {
00246     VP56RangeCoder *c = &s->c;
00247     VP56Model *model = s->modelp;
00248     int def_prob[11];
00249     int node, cg, ctx, pos;
00250     int ct;    /* code type */
00251     int pt;    /* plane type (0 for Y, 1 for U or V) */
00252 
00253     memset(def_prob, 0x80, sizeof(def_prob));
00254 
00255     for (pt=0; pt<2; pt++)
00256         for (node=0; node<11; node++)
00257             if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
00258                 def_prob[node] = vp56_rac_gets_nn(c, 7);
00259                 model->coeff_dccv[pt][node] = def_prob[node];
00260             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00261                 model->coeff_dccv[pt][node] = def_prob[node];
00262             }
00263 
00264     if (vp56_rac_get(c)) {
00265         for (pos=1; pos<64; pos++)
00266             if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
00267                 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
00268         vp6_coeff_order_table_init(s);
00269     }
00270 
00271     for (cg=0; cg<2; cg++)
00272         for (node=0; node<14; node++)
00273             if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
00274                 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
00275 
00276     for (ct=0; ct<3; ct++)
00277         for (pt=0; pt<2; pt++)
00278             for (cg=0; cg<6; cg++)
00279                 for (node=0; node<11; node++)
00280                     if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
00281                         def_prob[node] = vp56_rac_gets_nn(c, 7);
00282                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00283                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00284                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00285                     }
00286 
00287     if (s->use_huffman) {
00288         for (pt=0; pt<2; pt++) {
00289             if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
00290                                     vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
00291                 return -1;
00292             if (vp6_build_huff_tree(s, model->coeff_runv[pt],
00293                                     vp6_huff_run_map, 9, &s->runv_vlc[pt]))
00294                 return -1;
00295             for (ct=0; ct<3; ct++)
00296                 for (cg = 0; cg < 6; cg++)
00297                     if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
00298                                             vp6_huff_coeff_map, 12,
00299                                             &s->ract_vlc[pt][ct][cg]))
00300                         return -1;
00301         }
00302         memset(s->nb_null, 0, sizeof(s->nb_null));
00303     } else {
00304     /* coeff_dcct is a linear combination of coeff_dccv */
00305     for (pt=0; pt<2; pt++)
00306         for (ctx=0; ctx<3; ctx++)
00307             for (node=0; node<5; node++)
00308                 model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
00309     }
00310     return 0;
00311 }
00312 
00313 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
00314 {
00315     VP56RangeCoder *c = &s->c;
00316     VP56Model *model = s->modelp;
00317     int comp;
00318 
00319     *vect = (VP56mv) {0,0};
00320     if (s->vector_candidate_pos < 2)
00321         *vect = s->vector_candidate[0];
00322 
00323     for (comp=0; comp<2; comp++) {
00324         int i, delta = 0;
00325 
00326         if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
00327             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
00328             for (i=0; i<sizeof(prob_order); i++) {
00329                 int j = prob_order[i];
00330                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
00331             }
00332             if (delta & 0xF0)
00333                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
00334             else
00335                 delta |= 8;
00336         } else {
00337             delta = vp56_rac_get_tree(c, vp56_pva_tree,
00338                                       model->vector_pdv[comp]);
00339         }
00340 
00341         if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
00342             delta = -delta;
00343 
00344         if (!comp)
00345             vect->x += delta;
00346         else
00347             vect->y += delta;
00348     }
00349 }
00350 
00355 static unsigned vp6_get_nb_null(VP56Context *s)
00356 {
00357     unsigned val = get_bits(&s->gb, 2);
00358     if (val == 2)
00359         val += get_bits(&s->gb, 2);
00360     else if (val == 3) {
00361         val = get_bits1(&s->gb) << 2;
00362         val = 6+val + get_bits(&s->gb, 2+val);
00363     }
00364     return val;
00365 }
00366 
00367 static void vp6_parse_coeff_huffman(VP56Context *s)
00368 {
00369     VP56Model *model = s->modelp;
00370     uint8_t *permute = s->scantable.permutated;
00371     VLC *vlc_coeff;
00372     int coeff, sign, coeff_idx;
00373     int b, cg, idx;
00374     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00375 
00376     for (b=0; b<6; b++) {
00377         int ct = 0;    /* code type */
00378         if (b > 3) pt = 1;
00379         vlc_coeff = &s->dccv_vlc[pt];
00380 
00381         for (coeff_idx = 0;;) {
00382             int run = 1;
00383             if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
00384                 s->nb_null[coeff_idx][pt]--;
00385                 if (coeff_idx)
00386                     break;
00387             } else {
00388                 if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
00389                     return;
00390                 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
00391                 if (coeff == 0) {
00392                     if (coeff_idx) {
00393                         int pt = (coeff_idx >= 6);
00394                         run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
00395                         if (run >= 9)
00396                             run += get_bits(&s->gb, 6);
00397                     } else
00398                         s->nb_null[0][pt] = vp6_get_nb_null(s);
00399                     ct = 0;
00400                 } else if (coeff == 11) {  /* end of block */
00401                     if (coeff_idx == 1)    /* first AC coeff ? */
00402                         s->nb_null[1][pt] = vp6_get_nb_null(s);
00403                     break;
00404                 } else {
00405                     int coeff2 = vp56_coeff_bias[coeff];
00406                     if (coeff > 4)
00407                         coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
00408                     ct = 1 + (coeff2 > 1);
00409                     sign = get_bits1(&s->gb);
00410                     coeff2 = (coeff2 ^ -sign) + sign;
00411                     if (coeff_idx)
00412                         coeff2 *= s->dequant_ac;
00413                     idx = model->coeff_index_to_pos[coeff_idx];
00414                     s->block_coeff[b][permute[idx]] = coeff2;
00415                 }
00416             }
00417             coeff_idx+=run;
00418             if (coeff_idx >= 64)
00419                 break;
00420             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
00421             vlc_coeff = &s->ract_vlc[pt][ct][cg];
00422         }
00423     }
00424 }
00425 
00426 static void vp6_parse_coeff(VP56Context *s)
00427 {
00428     VP56RangeCoder *c = s->ccp;
00429     VP56Model *model = s->modelp;
00430     uint8_t *permute = s->scantable.permutated;
00431     uint8_t *model1, *model2, *model3;
00432     int coeff, sign, coeff_idx;
00433     int b, i, cg, idx, ctx;
00434     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00435 
00436     for (b=0; b<6; b++) {
00437         int ct = 1;    /* code type */
00438         int run = 1;
00439 
00440         if (b > 3) pt = 1;
00441 
00442         ctx = s->left_block[vp56_b6to4[b]].not_null_dc
00443               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
00444         model1 = model->coeff_dccv[pt];
00445         model2 = model->coeff_dcct[pt][ctx];
00446 
00447         coeff_idx = 0;
00448         for (;;) {
00449             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
00450                 /* parse a coeff */
00451                 if (vp56_rac_get_prob(c, model2[2])) {
00452                     if (vp56_rac_get_prob(c, model2[3])) {
00453                         idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
00454                         coeff = vp56_coeff_bias[idx+5];
00455                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
00456                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
00457                     } else {
00458                         if (vp56_rac_get_prob(c, model2[4]))
00459                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
00460                         else
00461                             coeff = 2;
00462                     }
00463                     ct = 2;
00464                 } else {
00465                     ct = 1;
00466                     coeff = 1;
00467                 }
00468                 sign = vp56_rac_get(c);
00469                 coeff = (coeff ^ -sign) + sign;
00470                 if (coeff_idx)
00471                     coeff *= s->dequant_ac;
00472                 idx = model->coeff_index_to_pos[coeff_idx];
00473                 s->block_coeff[b][permute[idx]] = coeff;
00474                 run = 1;
00475             } else {
00476                 /* parse a run */
00477                 ct = 0;
00478                 if (coeff_idx > 0) {
00479                     if (!vp56_rac_get_prob(c, model2[1]))
00480                         break;
00481 
00482                     model3 = model->coeff_runv[coeff_idx >= 6];
00483                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
00484                     if (!run)
00485                         for (run=9, i=0; i<6; i++)
00486                             run += vp56_rac_get_prob(c, model3[i+8]) << i;
00487                 }
00488             }
00489             coeff_idx += run;
00490             if (coeff_idx >= 64)
00491                 break;
00492             cg = vp6_coeff_groups[coeff_idx];
00493             model1 = model2 = model->coeff_ract[pt][ct][cg];
00494         }
00495 
00496         s->left_block[vp56_b6to4[b]].not_null_dc =
00497         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
00498     }
00499 }
00500 
00501 static int vp6_block_variance(uint8_t *src, int stride)
00502 {
00503     int sum = 0, square_sum = 0;
00504     int y, x;
00505 
00506     for (y=0; y<8; y+=2) {
00507         for (x=0; x<8; x+=2) {
00508             sum += src[x];
00509             square_sum += src[x]*src[x];
00510         }
00511         src += 2*stride;
00512     }
00513     return (16*square_sum - sum*sum) >> 8;
00514 }
00515 
00516 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
00517                            int delta, const int16_t *weights)
00518 {
00519     int x, y;
00520 
00521     for (y=0; y<8; y++) {
00522         for (x=0; x<8; x++) {
00523             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
00524                                  + src[x        ] * weights[1]
00525                                  + src[x+delta  ] * weights[2]
00526                                  + src[x+2*delta] * weights[3] + 64) >> 7);
00527         }
00528         src += stride;
00529         dst += stride;
00530     }
00531 }
00532 
00533 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
00534                              int stride, int h_weight, int v_weight)
00535 {
00536     uint8_t *tmp = s->edge_emu_buffer+16;
00537     s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
00538     s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
00539 }
00540 
00541 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
00542                        int offset1, int offset2, int stride,
00543                        VP56mv mv, int mask, int select, int luma)
00544 {
00545     int filter4 = 0;
00546     int x8 = mv.x & mask;
00547     int y8 = mv.y & mask;
00548 
00549     if (luma) {
00550         x8 *= 2;
00551         y8 *= 2;
00552         filter4 = s->filter_mode;
00553         if (filter4 == 2) {
00554             if (s->max_vector_length &&
00555                 (FFABS(mv.x) > s->max_vector_length ||
00556                  FFABS(mv.y) > s->max_vector_length)) {
00557                 filter4 = 0;
00558             } else if (s->sample_variance_threshold
00559                        && (vp6_block_variance(src+offset1, stride)
00560                            < s->sample_variance_threshold)) {
00561                 filter4 = 0;
00562             }
00563         }
00564     }
00565 
00566     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
00567         offset1 = offset2;
00568     }
00569 
00570     if (filter4) {
00571         if (!y8) {                      /* left or right combine */
00572             vp6_filter_hv4(dst, src+offset1, stride, 1,
00573                            vp6_block_copy_filter[select][x8]);
00574         } else if (!x8) {               /* above or below combine */
00575             vp6_filter_hv4(dst, src+offset1, stride, stride,
00576                            vp6_block_copy_filter[select][y8]);
00577         } else {
00578             s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
00579                              vp6_block_copy_filter[select][x8],
00580                              vp6_block_copy_filter[select][y8]);
00581         }
00582     } else {
00583         if (!x8 || !y8) {
00584             s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
00585         } else {
00586             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
00587         }
00588     }
00589 }
00590 
00591 static av_cold int vp6_decode_init(AVCodecContext *avctx)
00592 {
00593     VP56Context *s = avctx->priv_data;
00594 
00595     ff_vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
00596                         avctx->codec->id == CODEC_ID_VP6A);
00597     s->vp56_coord_div = vp6_coord_div;
00598     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
00599     s->filter = vp6_filter;
00600     s->default_models_init = vp6_default_models_init;
00601     s->parse_vector_models = vp6_parse_vector_models;
00602     s->parse_coeff_models = vp6_parse_coeff_models;
00603     s->parse_header = vp6_parse_header;
00604 
00605     return 0;
00606 }
00607 
00608 static av_cold int vp6_decode_free(AVCodecContext *avctx)
00609 {
00610     VP56Context *s = avctx->priv_data;
00611     int pt, ct, cg;
00612 
00613     ff_vp56_free(avctx);
00614 
00615     for (pt=0; pt<2; pt++) {
00616         free_vlc(&s->dccv_vlc[pt]);
00617         free_vlc(&s->runv_vlc[pt]);
00618         for (ct=0; ct<3; ct++)
00619             for (cg=0; cg<6; cg++)
00620                 free_vlc(&s->ract_vlc[pt][ct][cg]);
00621     }
00622     return 0;
00623 }
00624 
00625 AVCodec ff_vp6_decoder = {
00626     "vp6",
00627     AVMEDIA_TYPE_VIDEO,
00628     CODEC_ID_VP6,
00629     sizeof(VP56Context),
00630     vp6_decode_init,
00631     NULL,
00632     vp6_decode_free,
00633     ff_vp56_decode_frame,
00634     CODEC_CAP_DR1,
00635     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
00636 };
00637 
00638 /* flash version, not flipped upside-down */
00639 AVCodec ff_vp6f_decoder = {
00640     "vp6f",
00641     AVMEDIA_TYPE_VIDEO,
00642     CODEC_ID_VP6F,
00643     sizeof(VP56Context),
00644     vp6_decode_init,
00645     NULL,
00646     vp6_decode_free,
00647     ff_vp56_decode_frame,
00648     CODEC_CAP_DR1,
00649     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
00650 };
00651 
00652 /* flash version, not flipped upside-down, with alpha channel */
00653 AVCodec ff_vp6a_decoder = {
00654     "vp6a",
00655     AVMEDIA_TYPE_VIDEO,
00656     CODEC_ID_VP6A,
00657     sizeof(VP56Context),
00658     vp6_decode_init,
00659     NULL,
00660     vp6_decode_free,
00661     ff_vp56_decode_frame,
00662     CODEC_CAP_DR1,
00663     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
00664 };

Generated on Fri Feb 22 2013 07:24:29 for FFmpeg by  doxygen 1.7.1