static int decode_hq_slice(AVCodecContext *avctx, void *arg) { int i, quant, level, orientation, quant_idx; uint8_t quants[MAX_DWT_LEVELS][4]; DiracContext *s = avctx->priv_data; DiracSlice *slice = arg; GetBitContext *gb = &slice->gb; skip_bits_long(gb, 8*s->highquality.prefix_bytes); quant_idx = get_bits(gb, 8); /* Slice quantization (slice_quantizers() in the specs) */ for (level = 0; level < s->wavelet_depth; level++) { for (orientation = !!level; orientation < 4; orientation++) { quant = FFMAX(quant_idx - s->lowdelay.quant[level][orientation], 0); quants[level][orientation] = quant; } } /* Luma + 2 Chroma planes */ for (i = 0; i < 3; i++) { int64_t length = s->highquality.size_scaler * get_bits(gb, 8); int64_t bits_left = 8 * length; int64_t bits_end = get_bits_count(gb) + bits_left; if (bits_end >= INT_MAX) { av_log(s->avctx, AV_LOG_ERROR, "end too far away\n"); return AVERROR_INVALIDDATA; } for (level = 0; level < s->wavelet_depth; level++) { for (orientation = !!level; orientation < 4; orientation++) { decode_subband(s, gb, quants[level][orientation], slice->slice_x, slice->slice_y, bits_end, &s->plane[i].band[level][orientation], NULL); } } skip_bits_long(gb, bits_end - get_bits_count(gb)); } return 0; }