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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 
00040 static void vp6_parse_coeff(VP56Context *s);
00041 static void vp6_parse_coeff_huffman(VP56Context *s);
00042 
00043 static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
00044                             int *golden_frame)
00045 {
00046     VP56RangeCoder *c = &s->c;
00047     int parse_filter_info = 0;
00048     int coeff_offset = 0;
00049     int vrt_shift = 0;
00050     int sub_version;
00051     int rows, cols;
00052     int res = 1;
00053     int separated_coeff = buf[0] & 1;
00054 
00055     s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
00056     vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
00057 
00058     if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00059         sub_version = buf[1] >> 3;
00060         if (sub_version > 8)
00061             return 0;
00062         s->filter_header = buf[1] & 0x06;
00063         if (buf[1] & 1) {
00064             av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
00065             return 0;
00066         }
00067         if (separated_coeff || !s->filter_header) {
00068             coeff_offset = AV_RB16(buf+2) - 2;
00069             buf += 2;
00070             buf_size -= 2;
00071         }
00072 
00073         rows = buf[2];  /* number of stored macroblock rows */
00074         cols = buf[3];  /* number of stored macroblock cols */
00075         /* buf[4] is number of displayed macroblock rows */
00076         /* buf[5] is number of displayed macroblock cols */
00077 
00078         if (!s->macroblocks || /* first frame */
00079             16*cols != s->avctx->coded_width ||
00080             16*rows != s->avctx->coded_height) {
00081             avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
00082             if (s->avctx->extradata_size == 1) {
00083                 s->avctx->width  -= s->avctx->extradata[0] >> 4;
00084                 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
00085             }
00086             res = 2;
00087         }
00088 
00089         vp56_init_range_decoder(c, buf+6, buf_size-6);
00090         vp56_rac_gets(c, 2);
00091 
00092         parse_filter_info = s->filter_header;
00093         if (sub_version < 8)
00094             vrt_shift = 5;
00095         s->sub_version = sub_version;
00096     } else {
00097         if (!s->sub_version)
00098             return 0;
00099 
00100         if (separated_coeff || !s->filter_header) {
00101             coeff_offset = AV_RB16(buf+1) - 2;
00102             buf += 2;
00103             buf_size -= 2;
00104         }
00105         vp56_init_range_decoder(c, buf+1, buf_size-1);
00106 
00107         *golden_frame = vp56_rac_get(c);
00108         if (s->filter_header) {
00109             s->deblock_filtering = vp56_rac_get(c);
00110             if (s->deblock_filtering)
00111                 vp56_rac_get(c);
00112             if (s->sub_version > 7)
00113                 parse_filter_info = vp56_rac_get(c);
00114         }
00115     }
00116 
00117     if (parse_filter_info) {
00118         if (vp56_rac_get(c)) {
00119             s->filter_mode = 2;
00120             s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
00121             s->max_vector_length = 2 << vp56_rac_gets(c, 3);
00122         } else if (vp56_rac_get(c)) {
00123             s->filter_mode = 1;
00124         } else {
00125             s->filter_mode = 0;
00126         }
00127         if (s->sub_version > 7)
00128             s->filter_selection = vp56_rac_gets(c, 4);
00129         else
00130             s->filter_selection = 16;
00131     }
00132 
00133     s->use_huffman = vp56_rac_get(c);
00134 
00135     s->parse_coeff = vp6_parse_coeff;
00136     if (coeff_offset) {
00137         buf      += coeff_offset;
00138         buf_size -= coeff_offset;
00139         if (buf_size < 0)
00140             return 0;
00141         if (s->use_huffman) {
00142             s->parse_coeff = vp6_parse_coeff_huffman;
00143             init_get_bits(&s->gb, buf, buf_size<<3);
00144         } else {
00145             vp56_init_range_decoder(&s->cc, buf, buf_size);
00146             s->ccp = &s->cc;
00147         }
00148     } else {
00149         s->ccp = &s->c;
00150     }
00151 
00152     return res;
00153 }
00154 
00155 static void vp6_coeff_order_table_init(VP56Context *s)
00156 {
00157     int i, pos, idx = 1;
00158 
00159     s->modelp->coeff_index_to_pos[0] = 0;
00160     for (i=0; i<16; i++)
00161         for (pos=1; pos<64; pos++)
00162             if (s->modelp->coeff_reorder[pos] == i)
00163                 s->modelp->coeff_index_to_pos[idx++] = pos;
00164 }
00165 
00166 static void vp6_default_models_init(VP56Context *s)
00167 {
00168     VP56Model *model = s->modelp;
00169 
00170     model->vector_dct[0] = 0xA2;
00171     model->vector_dct[1] = 0xA4;
00172     model->vector_sig[0] = 0x80;
00173     model->vector_sig[1] = 0x80;
00174 
00175     memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
00176     memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
00177     memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
00178     memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
00179     memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
00180 
00181     vp6_coeff_order_table_init(s);
00182 }
00183 
00184 static void vp6_parse_vector_models(VP56Context *s)
00185 {
00186     VP56RangeCoder *c = &s->c;
00187     VP56Model *model = s->modelp;
00188     int comp, node;
00189 
00190     for (comp=0; comp<2; comp++) {
00191         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
00192             model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
00193         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
00194             model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
00195     }
00196 
00197     for (comp=0; comp<2; comp++)
00198         for (node=0; node<7; node++)
00199             if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
00200                 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
00201 
00202     for (comp=0; comp<2; comp++)
00203         for (node=0; node<8; node++)
00204             if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
00205                 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
00206 }
00207 
00208 /* nodes must ascend by count, but with descending symbol order */
00209 static int vp6_huff_cmp(const void *va, const void *vb)
00210 {
00211     const Node *a = va, *b = vb;
00212     return (a->count - b->count)*16 + (b->sym - a->sym);
00213 }
00214 
00215 static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
00216                                 const uint8_t *map, unsigned size, VLC *vlc)
00217 {
00218     Node nodes[2*size], *tmp = &nodes[size];
00219     int a, b, i;
00220 
00221     /* first compute probabilities from model */
00222     tmp[0].count = 256;
00223     for (i=0; i<size-1; i++) {
00224         a = tmp[i].count *        coeff_model[i]  >> 8;
00225         b = tmp[i].count * (255 - coeff_model[i]) >> 8;
00226         nodes[map[2*i  ]].count = a + !a;
00227         nodes[map[2*i+1]].count = b + !b;
00228     }
00229 
00230     free_vlc(vlc);
00231     /* then build the huffman tree accodring to probabilities */
00232     ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
00233                        FF_HUFFMAN_FLAG_HNODE_FIRST);
00234 }
00235 
00236 static void vp6_parse_coeff_models(VP56Context *s)
00237 {
00238     VP56RangeCoder *c = &s->c;
00239     VP56Model *model = s->modelp;
00240     int def_prob[11];
00241     int node, cg, ctx, pos;
00242     int ct;    /* code type */
00243     int pt;    /* plane type (0 for Y, 1 for U or V) */
00244 
00245     memset(def_prob, 0x80, sizeof(def_prob));
00246 
00247     for (pt=0; pt<2; pt++)
00248         for (node=0; node<11; node++)
00249             if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
00250                 def_prob[node] = vp56_rac_gets_nn(c, 7);
00251                 model->coeff_dccv[pt][node] = def_prob[node];
00252             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00253                 model->coeff_dccv[pt][node] = def_prob[node];
00254             }
00255 
00256     if (vp56_rac_get(c)) {
00257         for (pos=1; pos<64; pos++)
00258             if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
00259                 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
00260         vp6_coeff_order_table_init(s);
00261     }
00262 
00263     for (cg=0; cg<2; cg++)
00264         for (node=0; node<14; node++)
00265             if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
00266                 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
00267 
00268     for (ct=0; ct<3; ct++)
00269         for (pt=0; pt<2; pt++)
00270             for (cg=0; cg<6; cg++)
00271                 for (node=0; node<11; node++)
00272                     if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
00273                         def_prob[node] = vp56_rac_gets_nn(c, 7);
00274                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00275                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00276                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00277                     }
00278 
00279     if (s->use_huffman) {
00280         for (pt=0; pt<2; pt++) {
00281             vp6_build_huff_tree(s, model->coeff_dccv[pt],
00282                                 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
00283             vp6_build_huff_tree(s, model->coeff_runv[pt],
00284                                 vp6_huff_run_map, 9, &s->runv_vlc[pt]);
00285             for (ct=0; ct<3; ct++)
00286                 for (cg = 0; cg < 6; cg++)
00287                     vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
00288                                         vp6_huff_coeff_map, 12,
00289                                         &s->ract_vlc[pt][ct][cg]);
00290         }
00291         memset(s->nb_null, 0, sizeof(s->nb_null));
00292     } else {
00293     /* coeff_dcct is a linear combination of coeff_dccv */
00294     for (pt=0; pt<2; pt++)
00295         for (ctx=0; ctx<3; ctx++)
00296             for (node=0; node<5; node++)
00297                 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);
00298     }
00299 }
00300 
00301 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
00302 {
00303     VP56RangeCoder *c = &s->c;
00304     VP56Model *model = s->modelp;
00305     int comp;
00306 
00307     *vect = (VP56mv) {0,0};
00308     if (s->vector_candidate_pos < 2)
00309         *vect = s->vector_candidate[0];
00310 
00311     for (comp=0; comp<2; comp++) {
00312         int i, delta = 0;
00313 
00314         if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
00315             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
00316             for (i=0; i<sizeof(prob_order); i++) {
00317                 int j = prob_order[i];
00318                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
00319             }
00320             if (delta & 0xF0)
00321                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
00322             else
00323                 delta |= 8;
00324         } else {
00325             delta = vp56_rac_get_tree(c, vp56_pva_tree,
00326                                       model->vector_pdv[comp]);
00327         }
00328 
00329         if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
00330             delta = -delta;
00331 
00332         if (!comp)
00333             vect->x += delta;
00334         else
00335             vect->y += delta;
00336     }
00337 }
00338 
00343 static unsigned vp6_get_nb_null(VP56Context *s)
00344 {
00345     unsigned val = get_bits(&s->gb, 2);
00346     if (val == 2)
00347         val += get_bits(&s->gb, 2);
00348     else if (val == 3) {
00349         val = get_bits1(&s->gb) << 2;
00350         val = 6+val + get_bits(&s->gb, 2+val);
00351     }
00352     return val;
00353 }
00354 
00355 static void vp6_parse_coeff_huffman(VP56Context *s)
00356 {
00357     VP56Model *model = s->modelp;
00358     uint8_t *permute = s->scantable.permutated;
00359     VLC *vlc_coeff;
00360     int coeff, sign, coeff_idx;
00361     int b, cg, idx;
00362     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00363 
00364     for (b=0; b<6; b++) {
00365         int ct = 0;    /* code type */
00366         if (b > 3) pt = 1;
00367         vlc_coeff = &s->dccv_vlc[pt];
00368 
00369         for (coeff_idx=0; coeff_idx<64; ) {
00370             int run = 1;
00371             if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
00372                 s->nb_null[coeff_idx][pt]--;
00373                 if (coeff_idx)
00374                     break;
00375             } else {
00376                 if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
00377                     return;
00378                 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
00379                 if (coeff == 0) {
00380                     if (coeff_idx) {
00381                         int pt = (coeff_idx >= 6);
00382                         run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
00383                         if (run >= 9)
00384                             run += get_bits(&s->gb, 6);
00385                     } else
00386                         s->nb_null[0][pt] = vp6_get_nb_null(s);
00387                     ct = 0;
00388                 } else if (coeff == 11) {  /* end of block */
00389                     if (coeff_idx == 1)    /* first AC coeff ? */
00390                         s->nb_null[1][pt] = vp6_get_nb_null(s);
00391                     break;
00392                 } else {
00393                     int coeff2 = vp56_coeff_bias[coeff];
00394                     if (coeff > 4)
00395                         coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
00396                     ct = 1 + (coeff2 > 1);
00397                     sign = get_bits1(&s->gb);
00398                     coeff2 = (coeff2 ^ -sign) + sign;
00399                     if (coeff_idx)
00400                         coeff2 *= s->dequant_ac;
00401                     idx = model->coeff_index_to_pos[coeff_idx];
00402                     s->block_coeff[b][permute[idx]] = coeff2;
00403                 }
00404             }
00405             coeff_idx+=run;
00406             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
00407             vlc_coeff = &s->ract_vlc[pt][ct][cg];
00408         }
00409     }
00410 }
00411 
00412 static void vp6_parse_coeff(VP56Context *s)
00413 {
00414     VP56RangeCoder *c = s->ccp;
00415     VP56Model *model = s->modelp;
00416     uint8_t *permute = s->scantable.permutated;
00417     uint8_t *model1, *model2, *model3;
00418     int coeff, sign, coeff_idx;
00419     int b, i, cg, idx, ctx;
00420     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00421 
00422     for (b=0; b<6; b++) {
00423         int ct = 1;    /* code type */
00424         int run = 1;
00425 
00426         if (b > 3) pt = 1;
00427 
00428         ctx = s->left_block[vp56_b6to4[b]].not_null_dc
00429               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
00430         model1 = model->coeff_dccv[pt];
00431         model2 = model->coeff_dcct[pt][ctx];
00432 
00433         for (coeff_idx=0; coeff_idx<64; ) {
00434             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
00435                 /* parse a coeff */
00436                 if (vp56_rac_get_prob(c, model2[2])) {
00437                     if (vp56_rac_get_prob(c, model2[3])) {
00438                         idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
00439                         coeff = vp56_coeff_bias[idx+5];
00440                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
00441                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
00442                     } else {
00443                         if (vp56_rac_get_prob(c, model2[4]))
00444                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
00445                         else
00446                             coeff = 2;
00447                     }
00448                     ct = 2;
00449                 } else {
00450                     ct = 1;
00451                     coeff = 1;
00452                 }
00453                 sign = vp56_rac_get(c);
00454                 coeff = (coeff ^ -sign) + sign;
00455                 if (coeff_idx)
00456                     coeff *= s->dequant_ac;
00457                 idx = model->coeff_index_to_pos[coeff_idx];
00458                 s->block_coeff[b][permute[idx]] = coeff;
00459                 run = 1;
00460             } else {
00461                 /* parse a run */
00462                 ct = 0;
00463                 if (coeff_idx > 0) {
00464                     if (!vp56_rac_get_prob(c, model2[1]))
00465                         break;
00466 
00467                     model3 = model->coeff_runv[coeff_idx >= 6];
00468                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
00469                     if (!run)
00470                         for (run=9, i=0; i<6; i++)
00471                             run += vp56_rac_get_prob(c, model3[i+8]) << i;
00472                 }
00473             }
00474 
00475             cg = vp6_coeff_groups[coeff_idx+=run];
00476             model1 = model2 = model->coeff_ract[pt][ct][cg];
00477         }
00478 
00479         s->left_block[vp56_b6to4[b]].not_null_dc =
00480         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
00481     }
00482 }
00483 
00484 static int vp6_block_variance(uint8_t *src, int stride)
00485 {
00486     int sum = 0, square_sum = 0;
00487     int y, x;
00488 
00489     for (y=0; y<8; y+=2) {
00490         for (x=0; x<8; x+=2) {
00491             sum += src[x];
00492             square_sum += src[x]*src[x];
00493         }
00494         src += 2*stride;
00495     }
00496     return (16*square_sum - sum*sum) >> 8;
00497 }
00498 
00499 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
00500                            int delta, const int16_t *weights)
00501 {
00502     int x, y;
00503 
00504     for (y=0; y<8; y++) {
00505         for (x=0; x<8; x++) {
00506             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
00507                                  + src[x        ] * weights[1]
00508                                  + src[x+delta  ] * weights[2]
00509                                  + src[x+2*delta] * weights[3] + 64) >> 7);
00510         }
00511         src += stride;
00512         dst += stride;
00513     }
00514 }
00515 
00516 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
00517                              int stride, int h_weight, int v_weight)
00518 {
00519     uint8_t *tmp = s->edge_emu_buffer+16;
00520     s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
00521     s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
00522 }
00523 
00524 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
00525                        int offset1, int offset2, int stride,
00526                        VP56mv mv, int mask, int select, int luma)
00527 {
00528     int filter4 = 0;
00529     int x8 = mv.x & mask;
00530     int y8 = mv.y & mask;
00531 
00532     if (luma) {
00533         x8 *= 2;
00534         y8 *= 2;
00535         filter4 = s->filter_mode;
00536         if (filter4 == 2) {
00537             if (s->max_vector_length &&
00538                 (FFABS(mv.x) > s->max_vector_length ||
00539                  FFABS(mv.y) > s->max_vector_length)) {
00540                 filter4 = 0;
00541             } else if (s->sample_variance_threshold
00542                        && (vp6_block_variance(src+offset1, stride)
00543                            < s->sample_variance_threshold)) {
00544                 filter4 = 0;
00545             }
00546         }
00547     }
00548 
00549     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
00550         offset1 = offset2;
00551     }
00552 
00553     if (filter4) {
00554         if (!y8) {                      /* left or right combine */
00555             vp6_filter_hv4(dst, src+offset1, stride, 1,
00556                            vp6_block_copy_filter[select][x8]);
00557         } else if (!x8) {               /* above or below combine */
00558             vp6_filter_hv4(dst, src+offset1, stride, stride,
00559                            vp6_block_copy_filter[select][y8]);
00560         } else {
00561             s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
00562                              vp6_block_copy_filter[select][x8],
00563                              vp6_block_copy_filter[select][y8]);
00564         }
00565     } else {
00566         if (!x8 || !y8) {
00567             s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
00568         } else {
00569             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
00570         }
00571     }
00572 }
00573 
00574 static av_cold int vp6_decode_init(AVCodecContext *avctx)
00575 {
00576     VP56Context *s = avctx->priv_data;
00577 
00578     vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
00579                      avctx->codec->id == CODEC_ID_VP6A);
00580     s->vp56_coord_div = vp6_coord_div;
00581     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
00582     s->filter = vp6_filter;
00583     s->default_models_init = vp6_default_models_init;
00584     s->parse_vector_models = vp6_parse_vector_models;
00585     s->parse_coeff_models = vp6_parse_coeff_models;
00586     s->parse_header = vp6_parse_header;
00587 
00588     return 0;
00589 }
00590 
00591 static av_cold int vp6_decode_free(AVCodecContext *avctx)
00592 {
00593     VP56Context *s = avctx->priv_data;
00594     int pt, ct, cg;
00595 
00596     vp56_free(avctx);
00597 
00598     for (pt=0; pt<2; pt++) {
00599         free_vlc(&s->dccv_vlc[pt]);
00600         free_vlc(&s->runv_vlc[pt]);
00601         for (ct=0; ct<3; ct++)
00602             for (cg=0; cg<6; cg++)
00603                 free_vlc(&s->ract_vlc[pt][ct][cg]);
00604     }
00605     return 0;
00606 }
00607 
00608 AVCodec vp6_decoder = {
00609     "vp6",
00610     AVMEDIA_TYPE_VIDEO,
00611     CODEC_ID_VP6,
00612     sizeof(VP56Context),
00613     vp6_decode_init,
00614     NULL,
00615     vp6_decode_free,
00616     vp56_decode_frame,
00617     CODEC_CAP_DR1,
00618     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
00619 };
00620 
00621 /* flash version, not flipped upside-down */
00622 AVCodec vp6f_decoder = {
00623     "vp6f",
00624     AVMEDIA_TYPE_VIDEO,
00625     CODEC_ID_VP6F,
00626     sizeof(VP56Context),
00627     vp6_decode_init,
00628     NULL,
00629     vp6_decode_free,
00630     vp56_decode_frame,
00631     CODEC_CAP_DR1,
00632     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
00633 };
00634 
00635 /* flash version, not flipped upside-down, with alpha channel */
00636 AVCodec vp6a_decoder = {
00637     "vp6a",
00638     AVMEDIA_TYPE_VIDEO,
00639     CODEC_ID_VP6A,
00640     sizeof(VP56Context),
00641     vp6_decode_init,
00642     NULL,
00643     vp6_decode_free,
00644     vp56_decode_frame,
00645     CODEC_CAP_DR1,
00646     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
00647 };

Generated on Fri Sep 16 2011 17:17:46 for FFmpeg by  doxygen 1.7.1