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

libavcodec/vp6.c

Go to the documentation of this file.
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;;) {
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             if (coeff_idx >= 64)
00407                 break;
00408             cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
00409             vlc_coeff = &s->ract_vlc[pt][ct][cg];
00410         }
00411     }
00412 }
00413 
00414 static void vp6_parse_coeff(VP56Context *s)
00415 {
00416     VP56RangeCoder *c = s->ccp;
00417     VP56Model *model = s->modelp;
00418     uint8_t *permute = s->scantable.permutated;
00419     uint8_t *model1, *model2, *model3;
00420     int coeff, sign, coeff_idx;
00421     int b, i, cg, idx, ctx;
00422     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
00423 
00424     for (b=0; b<6; b++) {
00425         int ct = 1;    /* code type */
00426         int run = 1;
00427 
00428         if (b > 3) pt = 1;
00429 
00430         ctx = s->left_block[vp56_b6to4[b]].not_null_dc
00431               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
00432         model1 = model->coeff_dccv[pt];
00433         model2 = model->coeff_dcct[pt][ctx];
00434 
00435         coeff_idx = 0;
00436         for (;;) {
00437             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
00438                 /* parse a coeff */
00439                 if (vp56_rac_get_prob(c, model2[2])) {
00440                     if (vp56_rac_get_prob(c, model2[3])) {
00441                         idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
00442                         coeff = vp56_coeff_bias[idx+5];
00443                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
00444                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
00445                     } else {
00446                         if (vp56_rac_get_prob(c, model2[4]))
00447                             coeff = 3 + vp56_rac_get_prob(c, model1[5]);
00448                         else
00449                             coeff = 2;
00450                     }
00451                     ct = 2;
00452                 } else {
00453                     ct = 1;
00454                     coeff = 1;
00455                 }
00456                 sign = vp56_rac_get(c);
00457                 coeff = (coeff ^ -sign) + sign;
00458                 if (coeff_idx)
00459                     coeff *= s->dequant_ac;
00460                 idx = model->coeff_index_to_pos[coeff_idx];
00461                 s->block_coeff[b][permute[idx]] = coeff;
00462                 run = 1;
00463             } else {
00464                 /* parse a run */
00465                 ct = 0;
00466                 if (coeff_idx > 0) {
00467                     if (!vp56_rac_get_prob(c, model2[1]))
00468                         break;
00469 
00470                     model3 = model->coeff_runv[coeff_idx >= 6];
00471                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
00472                     if (!run)
00473                         for (run=9, i=0; i<6; i++)
00474                             run += vp56_rac_get_prob(c, model3[i+8]) << i;
00475                 }
00476             }
00477             coeff_idx += run;
00478             if (coeff_idx >= 64)
00479                 break;
00480             cg = vp6_coeff_groups[coeff_idx];
00481             model1 = model2 = model->coeff_ract[pt][ct][cg];
00482         }
00483 
00484         s->left_block[vp56_b6to4[b]].not_null_dc =
00485         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
00486     }
00487 }
00488 
00489 static int vp6_block_variance(uint8_t *src, int stride)
00490 {
00491     int sum = 0, square_sum = 0;
00492     int y, x;
00493 
00494     for (y=0; y<8; y+=2) {
00495         for (x=0; x<8; x+=2) {
00496             sum += src[x];
00497             square_sum += src[x]*src[x];
00498         }
00499         src += 2*stride;
00500     }
00501     return (16*square_sum - sum*sum) >> 8;
00502 }
00503 
00504 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
00505                            int delta, const int16_t *weights)
00506 {
00507     int x, y;
00508 
00509     for (y=0; y<8; y++) {
00510         for (x=0; x<8; x++) {
00511             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]
00512                                  + src[x        ] * weights[1]
00513                                  + src[x+delta  ] * weights[2]
00514                                  + src[x+2*delta] * weights[3] + 64) >> 7);
00515         }
00516         src += stride;
00517         dst += stride;
00518     }
00519 }
00520 
00521 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
00522                              int stride, int h_weight, int v_weight)
00523 {
00524     uint8_t *tmp = s->edge_emu_buffer+16;
00525     s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
00526     s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
00527 }
00528 
00529 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
00530                        int offset1, int offset2, int stride,
00531                        VP56mv mv, int mask, int select, int luma)
00532 {
00533     int filter4 = 0;
00534     int x8 = mv.x & mask;
00535     int y8 = mv.y & mask;
00536 
00537     if (luma) {
00538         x8 *= 2;
00539         y8 *= 2;
00540         filter4 = s->filter_mode;
00541         if (filter4 == 2) {
00542             if (s->max_vector_length &&
00543                 (FFABS(mv.x) > s->max_vector_length ||
00544                  FFABS(mv.y) > s->max_vector_length)) {
00545                 filter4 = 0;
00546             } else if (s->sample_variance_threshold
00547                        && (vp6_block_variance(src+offset1, stride)
00548                            < s->sample_variance_threshold)) {
00549                 filter4 = 0;
00550             }
00551         }
00552     }
00553 
00554     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
00555         offset1 = offset2;
00556     }
00557 
00558     if (filter4) {
00559         if (!y8) {                      /* left or right combine */
00560             vp6_filter_hv4(dst, src+offset1, stride, 1,
00561                            vp6_block_copy_filter[select][x8]);
00562         } else if (!x8) {               /* above or below combine */
00563             vp6_filter_hv4(dst, src+offset1, stride, stride,
00564                            vp6_block_copy_filter[select][y8]);
00565         } else {
00566             s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
00567                              vp6_block_copy_filter[select][x8],
00568                              vp6_block_copy_filter[select][y8]);
00569         }
00570     } else {
00571         if (!x8 || !y8) {
00572             s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
00573         } else {
00574             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
00575         }
00576     }
00577 }
00578 
00579 static av_cold int vp6_decode_init(AVCodecContext *avctx)
00580 {
00581     VP56Context *s = avctx->priv_data;
00582 
00583     vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
00584                      avctx->codec->id == CODEC_ID_VP6A);
00585     s->vp56_coord_div = vp6_coord_div;
00586     s->parse_vector_adjustment = vp6_parse_vector_adjustment;
00587     s->filter = vp6_filter;
00588     s->default_models_init = vp6_default_models_init;
00589     s->parse_vector_models = vp6_parse_vector_models;
00590     s->parse_coeff_models = vp6_parse_coeff_models;
00591     s->parse_header = vp6_parse_header;
00592 
00593     return 0;
00594 }
00595 
00596 static av_cold int vp6_decode_free(AVCodecContext *avctx)
00597 {
00598     VP56Context *s = avctx->priv_data;
00599     int pt, ct, cg;
00600 
00601     vp56_free(avctx);
00602 
00603     for (pt=0; pt<2; pt++) {
00604         free_vlc(&s->dccv_vlc[pt]);
00605         free_vlc(&s->runv_vlc[pt]);
00606         for (ct=0; ct<3; ct++)
00607             for (cg=0; cg<6; cg++)
00608                 free_vlc(&s->ract_vlc[pt][ct][cg]);
00609     }
00610     return 0;
00611 }
00612 
00613 AVCodec vp6_decoder = {
00614     "vp6",
00615     AVMEDIA_TYPE_VIDEO,
00616     CODEC_ID_VP6,
00617     sizeof(VP56Context),
00618     vp6_decode_init,
00619     NULL,
00620     vp6_decode_free,
00621     vp56_decode_frame,
00622     CODEC_CAP_DR1,
00623     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
00624 };
00625 
00626 /* flash version, not flipped upside-down */
00627 AVCodec vp6f_decoder = {
00628     "vp6f",
00629     AVMEDIA_TYPE_VIDEO,
00630     CODEC_ID_VP6F,
00631     sizeof(VP56Context),
00632     vp6_decode_init,
00633     NULL,
00634     vp6_decode_free,
00635     vp56_decode_frame,
00636     CODEC_CAP_DR1,
00637     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
00638 };
00639 
00640 /* flash version, not flipped upside-down, with alpha channel */
00641 AVCodec vp6a_decoder = {
00642     "vp6a",
00643     AVMEDIA_TYPE_VIDEO,
00644     CODEC_ID_VP6A,
00645     sizeof(VP56Context),
00646     vp6_decode_init,
00647     NULL,
00648     vp6_decode_free,
00649     vp56_decode_frame,
00650     CODEC_CAP_DR1,
00651     .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
00652 };

Generated on Wed Dec 21 2011 18:44:11 for FFmpeg by  doxygen 1.7.1