Libav

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             if (s->framep[VP56_FRAME_CURRENT]->key_frame)
00141                 avcodec_set_dimensions(s->avctx, 0, 0);
00142             return 0;
00143         }
00144         if (s->use_huffman) {
00145             s->parse_coeff = vp6_parse_coeff_huffman;
00146             init_get_bits(&s->gb, buf, buf_size<<3);
00147         } else {
00148             vp56_init_range_decoder(&s->cc, buf, buf_size);
00149             s->ccp = &s->cc;
00150         }
00151     } else {
00152         s->ccp = &s->c;
00153     }
00154 
00155     return res;
00156 }
00157 
00158 static void vp6_coeff_order_table_init(VP56Context *s)
00159 {
00160     int i, pos, idx = 1;
00161 
00162     s->modelp->coeff_index_to_pos[0] = 0;
00163     for (i=0; i<16; i++)
00164         for (pos=1; pos<64; pos++)
00165             if (s->modelp->coeff_reorder[pos] == i)
00166                 s->modelp->coeff_index_to_pos[idx++] = pos;
00167 }
00168 
00169 static void vp6_default_models_init(VP56Context *s)
00170 {
00171     VP56Model *model = s->modelp;
00172 
00173     model->vector_dct[0] = 0xA2;
00174     model->vector_dct[1] = 0xA4;
00175     model->vector_sig[0] = 0x80;
00176     model->vector_sig[1] = 0x80;
00177 
00178     memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
00179     memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
00180     memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
00181     memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
00182     memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
00183 
00184     vp6_coeff_order_table_init(s);
00185 }
00186 
00187 static void vp6_parse_vector_models(VP56Context *s)
00188 {
00189     VP56RangeCoder *c = &s->c;
00190     VP56Model *model = s->modelp;
00191     int comp, node;
00192 
00193     for (comp=0; comp<2; comp++) {
00194         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
00195             model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
00196         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
00197             model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
00198     }
00199 
00200     for (comp=0; comp<2; comp++)
00201         for (node=0; node<7; node++)
00202             if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
00203                 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
00204 
00205     for (comp=0; comp<2; comp++)
00206         for (node=0; node<8; node++)
00207             if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
00208                 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
00209 }
00210 
00211 /* nodes must ascend by count, but with descending symbol order */
00212 static int vp6_huff_cmp(const void *va, const void *vb)
00213 {
00214     const Node *a = va, *b = vb;
00215     return (a->count - b->count)*16 + (b->sym - a->sym);
00216 }
00217 
00218 static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
00219                                const uint8_t *map, unsigned size, VLC *vlc)
00220 {
00221     Node nodes[2*size], *tmp = &nodes[size];
00222     int a, b, i;
00223 
00224     /* first compute probabilities from model */
00225     tmp[0].count = 256;
00226     for (i=0; i<size-1; i++) {
00227         a = tmp[i].count *        coeff_model[i]  >> 8;
00228         b = tmp[i].count * (255 - coeff_model[i]) >> 8;
00229         nodes[map[2*i  ]].count = a + !a;
00230         nodes[map[2*i+1]].count = b + !b;
00231     }
00232 
00233     free_vlc(vlc);
00234     /* then build the huffman tree according to probabilities */
00235     return ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
00236                               FF_HUFFMAN_FLAG_HNODE_FIRST);
00237 }
00238 
00239 static int vp6_parse_coeff_models(VP56Context *s)
00240 {
00241     VP56RangeCoder *c = &s->c;
00242     VP56Model *model = s->modelp;
00243     int def_prob[11];
00244     int node, cg, ctx, pos;
00245     int ct;    /* code type */
00246     int pt;    /* plane type (0 for Y, 1 for U or V) */
00247 
00248     memset(def_prob, 0x80, sizeof(def_prob));
00249 
00250     for (pt=0; pt<2; pt++)
00251         for (node=0; node<11; node++)
00252             if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
00253                 def_prob[node] = vp56_rac_gets_nn(c, 7);
00254                 model->coeff_dccv[pt][node] = def_prob[node];
00255             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00256                 model->coeff_dccv[pt][node] = def_prob[node];
00257             }
00258 
00259     if (vp56_rac_get(c)) {
00260         for (pos=1; pos<64; pos++)
00261             if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
00262                 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
00263         vp6_coeff_order_table_init(s);
00264     }
00265 
00266     for (cg=0; cg<2; cg++)
00267         for (node=0; node<14; node++)
00268             if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
00269                 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
00270 
00271     for (ct=0; ct<3; ct++)
00272         for (pt=0; pt<2; pt++)
00273             for (cg=0; cg<6; cg++)
00274                 for (node=0; node<11; node++)
00275                     if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
00276                         def_prob[node] = vp56_rac_gets_nn(c, 7);
00277                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00278                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00279                         model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00280                     }
00281 
00282     if (s->use_huffman) {
00283         for (pt=0; pt<2; pt++) {
00284             if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
00285                                     vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
00286                 return -1;
00287             if (vp6_build_huff_tree(s, model->coeff_runv[pt],
00288                                     vp6_huff_run_map, 9, &s->runv_vlc[pt]))
00289                 return -1;
00290             for (ct=0; ct<3; ct++)
00291                 for (cg = 0; cg < 6; cg++)
00292                     if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
00293                                             vp6_huff_coeff_map, 12,
00294                                             &s->ract_vlc[pt][ct][cg]))
00295                         return -1;
00296         }
00297         memset(s->nb_null, 0, sizeof(s->nb_null));
00298     } else {
00299     /* coeff_dcct is a linear combination of coeff_dccv */
00300     for (pt=0; pt<2; pt++)
00301         for (ctx=0; ctx<3; ctx++)
00302             for (node=0; node<5; node++)
00303                 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);
00304     }
00305     return 0;
00306 }
00307 
00308 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
00309 {
00310     VP56RangeCoder *c = &s->c;
00311     VP56Model *model = s->modelp;
00312     int comp;
00313 
00314     *vect = (VP56mv) {0,0};
00315     if (s->vector_candidate_pos < 2)
00316         *vect = s->vector_candidate[0];
00317 
00318     for (comp=0; comp<2; comp++) {
00319         int i, delta = 0;
00320 
00321         if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
00322             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
00323             for (i=0; i<sizeof(prob_order); i++) {
00324                 int j = prob_order[i];
00325                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
00326             }
00327             if (delta & 0xF0)
00328                 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
00329             else
00330                 delta |= 8;
00331         } else {
00332             delta = vp56_rac_get_tree(c, vp56_pva_tree,
00333                                       model->vector_pdv[comp]);
00334         }
00335 
00336         if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
00337             delta = -delta;
00338 
00339         if (!comp)
00340             vect->x += delta;
00341         else
00342             vect->y += delta;
00343     }
00344 }
00345 
00350 static unsigned vp6_get_nb_null(VP56Context *s)
00351 {
00352     unsigned val = get_bits(&s->gb, 2);
00353     if (val == 2)
00354         val += get_bits(&s->gb, 2);
00355     else if (val == 3) {
00356         val = get_bits1(&s->gb) << 2;
00357         val = 6+val + get_bits(&s->gb, 2+val);
00358     }
00359     return val;
00360 }
00361 
00362 static void vp6_parse_coeff_huffman(VP56Context *s)
00363 {
00364     VP56Model *model = s->modelp;
00365     uint8_t *permute = s->scantable.permutated;
00366     VLC *vlc_coeff;
00367     int coeff, sign, coeff_idx;
00368     int b, cg, idx;
00369     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00370 
00371     for (b=0; b<6; b++) {
00372         int ct = 0;    /* code type */
00373         if (b > 3) pt = 1;
00374         vlc_coeff = &s->dccv_vlc[pt];
00375 
00376         for (coeff_idx = 0;;) {
00377             int run = 1;
00378             if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
00379                 s->nb_null[coeff_idx][pt]--;
00380                 if (coeff_idx)
00381                     break;
00382             } else {
00383                 if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
00384                     return;
00385                 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
00386                 if (coeff == 0) {
00387                     if (coeff_idx) {
00388                         int pt = (coeff_idx >= 6);
00389                         run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
00390                         if (run >= 9)
00391                             run += get_bits(&s->gb, 6);
00392                     } else
00393                         s->nb_null[0][pt] = vp6_get_nb_null(s);
00394                     ct = 0;
00395                 } else if (coeff == 11) {  /* end of block */
00396                     if (coeff_idx == 1)    /* first AC coeff ? */
00397                         s->nb_null[1][pt] = vp6_get_nb_null(s);
00398                     break;
00399                 } else {
00400                     int coeff2 = vp56_coeff_bias[coeff];
00401                     if (coeff > 4)
00402                         coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
00403                     ct = 1 + (coeff2 > 1);
00404                     sign = get_bits1(&s->gb);
00405                     coeff2 = (coeff2 ^ -sign) + sign;
00406                     if (coeff_idx)
00407                         coeff2 *= s->dequant_ac;
00408                     idx = model->coeff_index_to_pos[coeff_idx];
00409                     s->block_coeff[b][permute[idx]] = coeff2;
00410                 }
00411             }
00412             coeff_idx+=run;
00413             if (coeff_idx >= 64)
00414                 break;
00415             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
00416             vlc_coeff = &s->ract_vlc[pt][ct][cg];
00417         }
00418     }
00419 }
00420 
00421 static void vp6_parse_coeff(VP56Context *s)
00422 {
00423     VP56RangeCoder *c = s->ccp;
00424     VP56Model *model = s->modelp;
00425     uint8_t *permute = s->scantable.permutated;
00426     uint8_t *model1, *model2, *model3;
00427     int coeff, sign, coeff_idx;
00428     int b, i, cg, idx, ctx;
00429     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00430 
00431     for (b=0; b<6; b++) {
00432         int ct = 1;    /* code type */
00433         int run = 1;
00434 
00435         if (b > 3) pt = 1;
00436 
00437         ctx = s->left_block[vp56_b6to4[b]].not_null_dc
00438               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
00439         model1 = model->coeff_dccv[pt];
00440         model2 = model->coeff_dcct[pt][ctx];
00441 
00442         coeff_idx = 0;
00443         for (;;) {
00444             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
00445                 /* parse a coeff */
00446                 if (vp56_rac_get_prob(c, model2[2])) {
00447                     if (vp56_rac_get_prob(c, model2[3])) {
00448                         idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
00449                         coeff = vp56_coeff_bias[idx+5];
00450                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
00451                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
00452                     } else {
00453                         if (vp56_rac_get_prob(c, model2[4]))
00454                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
00455                         else
00456                             coeff = 2;
00457                     }
00458                     ct = 2;
00459                 } else {
00460                     ct = 1;
00461                     coeff = 1;
00462                 }
00463                 sign = vp56_rac_get(c);
00464                 coeff = (coeff ^ -sign) + sign;
00465                 if (coeff_idx)
00466                     coeff *= s->dequant_ac;
00467                 idx = model->coeff_index_to_pos[coeff_idx];
00468                 s->block_coeff[b][permute[idx]] = coeff;
00469                 run = 1;
00470             } else {
00471                 /* parse a run */
00472                 ct = 0;
00473                 if (coeff_idx > 0) {
00474                     if (!vp56_rac_get_prob(c, model2[1]))
00475                         break;
00476 
00477                     model3 = model->coeff_runv[coeff_idx >= 6];
00478                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
00479                     if (!run)
00480                         for (run=9, i=0; i<6; i++)
00481                             run += vp56_rac_get_prob(c, model3[i+8]) << i;
00482                 }
00483             }
00484             coeff_idx += run;
00485             if (coeff_idx >= 64)
00486                 break;
00487             cg = vp6_coeff_groups[coeff_idx];
00488             model1 = model2 = model->coeff_ract[pt][ct][cg];
00489         }
00490 
00491         s->left_block[vp56_b6to4[b]].not_null_dc =
00492         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
00493     }
00494 }
00495 
00496 static int vp6_block_variance(uint8_t *src, int stride)
00497 {
00498     int sum = 0, square_sum = 0;
00499     int y, x;
00500 
00501     for (y=0; y<8; y+=2) {
00502         for (x=0; x<8; x+=2) {
00503             sum += src[x];
00504             square_sum += src[x]*src[x];
00505         }
00506         src += 2*stride;
00507     }
00508     return (16*square_sum - sum*sum) >> 8;
00509 }
00510 
00511 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
00512                            int delta, const int16_t *weights)
00513 {
00514     int x, y;
00515 
00516     for (y=0; y<8; y++) {
00517         for (x=0; x<8; x++) {
00518             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
00519                                  + src[x        ] * weights[1]
00520                                  + src[x+delta  ] * weights[2]
00521                                  + src[x+2*delta] * weights[3] + 64) >> 7);
00522         }
00523         src += stride;
00524         dst += stride;
00525     }
00526 }
00527 
00528 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
00529                              int stride, int h_weight, int v_weight)
00530 {
00531     uint8_t *tmp = s->edge_emu_buffer+16;
00532     s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
00533     s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
00534 }
00535 
00536 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
00537                        int offset1, int offset2, int stride,
00538                        VP56mv mv, int mask, int select, int luma)
00539 {
00540     int filter4 = 0;
00541     int x8 = mv.x & mask;
00542     int y8 = mv.y & mask;
00543 
00544     if (luma) {
00545         x8 *= 2;
00546         y8 *= 2;
00547         filter4 = s->filter_mode;
00548         if (filter4 == 2) {
00549             if (s->max_vector_length &&
00550                 (FFABS(mv.x) > s->max_vector_length ||
00551                  FFABS(mv.y) > s->max_vector_length)) {
00552                 filter4 = 0;
00553             } else if (s->sample_variance_threshold
00554                        && (vp6_block_variance(src+offset1, stride)
00555                            < s->sample_variance_threshold)) {
00556                 filter4 = 0;
00557             }
00558         }
00559     }
00560 
00561     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
00562         offset1 = offset2;
00563     }
00564 
00565     if (filter4) {
00566         if (!y8) {                      /* left or right combine */
00567             vp6_filter_hv4(dst, src+offset1, stride, 1,
00568                            vp6_block_copy_filter[select][x8]);
00569         } else if (!x8) {               /* above or below combine */
00570             vp6_filter_hv4(dst, src+offset1, stride, stride,
00571                            vp6_block_copy_filter[select][y8]);
00572         } else {
00573             s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
00574                              vp6_block_copy_filter[select][x8],
00575                              vp6_block_copy_filter[select][y8]);
00576         }
00577     } else {
00578         if (!x8 || !y8) {
00579             s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
00580         } else {
00581             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
00582         }
00583     }
00584 }
00585 
00586 static av_cold int vp6_decode_init(AVCodecContext *avctx)
00587 {
00588     VP56Context *s = avctx->priv_data;
00589 
00590     vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
00591                      avctx->codec->id == CODEC_ID_VP6A);
00592     s->vp56_coord_div = vp6_coord_div;
00593     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
00594     s->filter = vp6_filter;
00595     s->default_models_init = vp6_default_models_init;
00596     s->parse_vector_models = vp6_parse_vector_models;
00597     s->parse_coeff_models = vp6_parse_coeff_models;
00598     s->parse_header = vp6_parse_header;
00599 
00600     return 0;
00601 }
00602 
00603 static av_cold int vp6_decode_free(AVCodecContext *avctx)
00604 {
00605     VP56Context *s = avctx->priv_data;
00606     int pt, ct, cg;
00607 
00608     vp56_free(avctx);
00609 
00610     for (pt=0; pt<2; pt++) {
00611         free_vlc(&s->dccv_vlc[pt]);
00612         free_vlc(&s->runv_vlc[pt]);
00613         for (ct=0; ct<3; ct++)
00614             for (cg=0; cg<6; cg++)
00615                 free_vlc(&s->ract_vlc[pt][ct][cg]);
00616     }
00617     return 0;
00618 }
00619 
00620 AVCodec vp6_decoder = {
00621     "vp6",
00622     AVMEDIA_TYPE_VIDEO,
00623     CODEC_ID_VP6,
00624     sizeof(VP56Context),
00625     vp6_decode_init,
00626     NULL,
00627     vp6_decode_free,
00628     vp56_decode_frame,
00629     CODEC_CAP_DR1,
00630     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
00631 };
00632 
00633 /* flash version, not flipped upside-down */
00634 AVCodec vp6f_decoder = {
00635     "vp6f",
00636     AVMEDIA_TYPE_VIDEO,
00637     CODEC_ID_VP6F,
00638     sizeof(VP56Context),
00639     vp6_decode_init,
00640     NULL,
00641     vp6_decode_free,
00642     vp56_decode_frame,
00643     CODEC_CAP_DR1,
00644     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
00645 };
00646 
00647 /* flash version, not flipped upside-down, with alpha channel */
00648 AVCodec vp6a_decoder = {
00649     "vp6a",
00650     AVMEDIA_TYPE_VIDEO,
00651     CODEC_ID_VP6A,
00652     sizeof(VP56Context),
00653     vp6_decode_init,
00654     NULL,
00655     vp6_decode_free,
00656     vp56_decode_frame,
00657     CODEC_CAP_DR1,
00658     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
00659 };