static int h263_decode_block(MpegEncContext * s, int16_t * block, int n, int coded) { int level, i, j, run; RLTable *rl = &ff_h263_rl_inter; const uint8_t *scan_table; GetBitContext gb= s->gb; scan_table = s->intra_scantable.permutated; if (s->h263_aic && s->mb_intra) { rl = &ff_rl_intra_aic; i = 0; if (s->ac_pred) { if (s->h263_aic_dir) scan_table = s->intra_v_scantable.permutated; /* left */ else scan_table = s->intra_h_scantable.permutated; /* top */ } } else if (s->mb_intra) { /* DC coef */ if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) { if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) { int component, diff; component = (n <= 3 ? 0 : n - 4 + 1); level = s->last_dc[component]; if (s->rv10_first_dc_coded[component]) { diff = ff_rv_decode_dc(s, n); if (diff == 0xffff) return -1; level += diff; level = level & 0xff; /* handle wrap round */ s->last_dc[component] = level; } else { s->rv10_first_dc_coded[component] = 1; } } else { level = get_bits(&s->gb, 8); if (level == 255) level = 128; } }else{ level = get_bits(&s->gb, 8); if((level&0x7F) == 0){ av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y); if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) return -1; } if (level == 255) level = 128; } block[0] = level; i = 1; } else { i = 0; } if (!coded) { if (s->mb_intra && s->h263_aic) goto not_coded; s->block_last_index[n] = i - 1; return 0; } retry: { OPEN_READER(re, &s->gb); i--; // offset by -1 to allow direct indexing of scan_table for(;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (run == 66) { if (level){ CLOSE_READER(re, &s->gb); av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y); return -1; } /* escape */ if (CONFIG_FLV_DECODER && s->h263_flv > 1) { int is11 = SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); run = SHOW_UBITS(re, &s->gb, 7) + 1; if (is11) { SKIP_COUNTER(re, &s->gb, 1 + 7); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 11); SKIP_COUNTER(re, &s->gb, 11); } else { SKIP_CACHE(re, &s->gb, 7); level = SHOW_SBITS(re, &s->gb, 7); SKIP_COUNTER(re, &s->gb, 1 + 7 + 7); } } else { run = SHOW_UBITS(re, &s->gb, 7) + 1; SKIP_CACHE(re, &s->gb, 7); level = (int8_t)SHOW_UBITS(re, &s->gb, 8); SKIP_COUNTER(re, &s->gb, 7 + 8); if(level == -128){ UPDATE_CACHE(re, &s->gb); if (s->codec_id == AV_CODEC_ID_RV10) { /* XXX: should patch encoder too */ level = SHOW_SBITS(re, &s->gb, 12); SKIP_COUNTER(re, &s->gb, 12); }else{ level = SHOW_UBITS(re, &s->gb, 5); SKIP_CACHE(re, &s->gb, 5); level |= SHOW_SBITS(re, &s->gb, 6)<<5; SKIP_COUNTER(re, &s->gb, 5 + 6); } } } } else { if (SHOW_UBITS(re, &s->gb, 1)) level = -level; SKIP_COUNTER(re, &s->gb, 1); } i += run; if (i >= 64){ CLOSE_READER(re, &s->gb); // redo update without last flag, revert -1 offset i = i - run + ((run-1)&63) + 1; if (i < 64) { // only last marker, no overrun block[scan_table[i]] = level; break; } if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){ //Looks like a hack but no, it's the way it is supposed to work ... rl = &ff_rl_intra_aic; i = 0; s->gb= gb; s->bdsp.clear_block(block); goto retry; } av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra); return -1; } j = scan_table[i]; block[j] = level; } } not_coded: if (s->mb_intra && s->h263_aic) { ff_h263_pred_acdc(s, block, n); i = 63; } s->block_last_index[n] = i; return 0; }