static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz, int ac_index, int16_t *quant_matrix, int ss, int se, int Al, int *EOBRUN) { int code, i, j, level, val, run; if(*EOBRUN){ (*EOBRUN)--; return 0; } {OPEN_READER(re, &s->gb) for(i=ss;;i++) { UPDATE_CACHE(re, &s->gb); GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2) /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */ code -= 16; run = ((unsigned) code) >> 4; code &= 0xF; if(code) { i += run; if(code > MIN_CACHE_BITS - 16){ UPDATE_CACHE(re, &s->gb) } { int cache=GET_CACHE(re,&s->gb); int sign=(~cache)>>31; level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign; } LAST_SKIP_BITS(re, &s->gb, code) if (i >= se) { if(i == se){ j = s->scantable.permutated[se]; block[j] = level * quant_matrix[j] << Al; break; } av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); return -1; } j = s->scantable.permutated[i]; block[j] = level * quant_matrix[j] << Al; }else{ if(run == 0xF){// ZRL - skip 15 coefficients i += 15; }else{ val = (1 << run); if(run){ UPDATE_CACHE(re, &s->gb); val += NEG_USR32(GET_CACHE(re, &s->gb), run); LAST_SKIP_BITS(re, &s->gb, run); } *EOBRUN = val - 1; break; } } } CLOSE_READER(re, &s->gb)} if(i > *last_nnz) *last_nnz = i; return 0; }