static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set, uint8_t *dst, int stride, int plane) { GetBitContext *gb = &c->gb; int prev_dc, dc, nc, ac, bpos, val; int i, j, k, l; if (get_bits1(gb)) { if (get_bits1(gb)) { val = get_bits(gb, 8); for (i = 0; i < 8; i++, dst += stride) memset(dst, val, 16); } else { if (get_bits_left(gb) < 16 * 8 * 8) return AVERROR_INVALIDDATA; for (i = 0; i < 8; i++) { for (j = 0; j < 16; j++) dst[j] = get_bits(gb, 8); dst += stride; } } return 0; } prev_dc = 0; for (j = 0; j < 2; j++) { for (k = 0; k < 4; k++) { if (!(j | k)) { dc = get_bits(gb, 8); } else { dc = get_vlc2(gb, c->dc_vlc.table, 9, 2); if (dc == -1) return AVERROR_INVALIDDATA; if (dc == 0x100) dc = get_bits(gb, 8); } dc = (dc + prev_dc) & 0xFF; prev_dc = dc; c->block[0] = dc; nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1); if (nc == -1) return AVERROR_INVALIDDATA; bpos = 1; memset(c->block + 1, 0, 15 * sizeof(*c->block)); for (l = 0; l < nc; l++) { ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2); if (ac == -1) return AVERROR_INVALIDDATA; if (ac == 0x1000) ac = get_bits(gb, 12); bpos += ac & 0xF; if (bpos >= 64) return AVERROR_INVALIDDATA; val = sign_extend(ac >> 4, 8); c->block[tscc2_zigzag[bpos++]] = val; } tscc2_idct4_put(c->block, q, dst + k * 4, stride); } dst += 4 * stride; } return 0; }
static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set, uint8_t *dst, int stride, int plane) { GetBitContext *gb = &c->gb; int prev_dc, dc, nc, ac, bpos, val; int i, j, k, l; if (get_bits1(gb)) { if (get_bits1(gb)) { val = get_bits(gb, 8); for (i = 0; i < 8; i++, dst += stride) memset(dst, val, 16); } else { if (get_bits_left(gb) < 16 * 8 * 8) return AVERROR_INVALIDDATA; for (i = 0; i < 8; i++) { for (j = 0; j < 16; j++) dst[j] = get_bits(gb, 8); dst += stride; } } return 0; } prev_dc = 0; for (j = 0; j < 2; j++) { for (k = 0; k < 4; k++) { if (!(j | k)) { dc = get_bits(gb, 8); } else { dc = get_vlc2(gb, c->dc_vlc.table, 9, 2); if (dc == -1) return AVERROR_INVALIDDATA; if (dc == 0x100) dc = get_bits(gb, 8); } dc = (dc + prev_dc) & 0xFF; prev_dc = dc; c->block[0] = dc; nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1); if (nc == -1) return AVERROR_INVALIDDATA; bpos = 1; memset(c->block + 1, 0, 15 * sizeof(*c->block)); for (l = 0; l < nc; l++) { ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2); if (ac == -1) return AVERROR_INVALIDDATA; if (ac == 0x1000) ac = get_bits(gb, 12); bpos += ac & 0xF; if (bpos >= 64) return AVERROR_INVALIDDATA; val = sign_extend(ac >> 4, 8); c->block[tscc2_zigzag[bpos++]] = val; } tscc2_idct4_put(c->block, q, dst + k * 4, stride); } dst += 4 * stride; } return 0; }