case 2: {   							\      /* show_bits10(index); */						\      index = next32bits >> 22;						\      value = dct_coeff_tbl_2[index & 3];				\      break;                                                            \    }									\    case 3: { 						                \      /* show_bits10(index); */						\      index = next32bits >> 22;						\      value = dct_coeff_tbl_3[index & 3];				\      break;                                                            \    }									\    case 1: {                                             		\      /* show_bits12(index); */						\      index = next32bits >> 20;						\      value = dct_coeff_tbl_1[index & 15];				\      break;                                                            \    }									\    default: { /* index == 0 */						\      /* show_bits16(index); */						\      index = next32bits >> 16;						\      value = dct_coeff_tbl_0[index & 255];				\    }}									\    run = value >> RUN_SHIFT;						\    level = (value & LEVEL_MASK) >> LEVEL_SHIFT;			\									\    /*									\     * Fold these operations together to make it fast...		\     */									\    /* num_bits = (value & NUM_MASK) + 1; */				\    /* flush_bits(num_bits); */						\    /* get_bits1(value); */						\    /* if (value) level = -level; */					\									\    flushed = (value & NUM_MASK) + 2;					\    value = next32bits >> (32-flushed);					\    value &= 0x1;							\    if (value) level = -level;						\									\    /* Update bitstream ... */						\    flush_bits(flushed);						\    assert (flushed <= 32);						\  }									\}#define DecodeDCTCoeffFirst(runval, levelval)         \{                                                     \  DecodeDCTCoeff(dct_coeff_first, runval, levelval);  \}          #define DecodeDCTCoeffNext(runval, levelval)          \{                                                     \  DecodeDCTCoeff(dct_coeff_next, runval, levelval);   \}/* *-------------------------------------------------------------- * * DecodeMBAddrInc -- * *      Huffman Decoder for macro_block_address_increment; the location *      in which the result will be placed is being passed as argument. *      The decoded value is obtained by doing a table lookup on *      mb_addr_inc. * * Results: *      The decoded value for macro_block_address_increment or ERROR *      for unbound values will be placed in the location specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeMBAddrInc(val)				\{							\    unsigned int index;					\    show_bits11(index);					\    val = mb_addr_inc[index].value;			\    flush_bits(mb_addr_inc[index].num_bits);		\}/* *-------------------------------------------------------------- * * DecodeMotionVectors -- * *      Huffman Decoder for the various motion vectors, including *      motion_horizontal_forward_code, motion_vertical_forward_code, *      motion_horizontal_backward_code, motion_vertical_backward_code. *      Location where the decoded result will be placed is being passed *      as argument. The decoded values are obtained by doing a table *      lookup on motion_vectors. * * Results: *      The decoded value for the motion vector or ERROR for unbound *      values will be placed in the location specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeMotionVectors(value)			\{							\  unsigned int index;					\  show_bits11(index);					\  value = motion_vectors[index].code;			\  flush_bits(motion_vectors[index].num_bits);		\}/* *-------------------------------------------------------------- * * DecodeMBTypeB -- * *      Huffman Decoder for macro_block_type in bidirectionally-coded *      pictures;locations in which the decoded results: macroblock_quant, *      macroblock_motion_forward, macro_block_motion_backward, *      macroblock_pattern, macro_block_intra, will be placed are *      being passed as argument. The decoded values are obtained by *      doing a table lookup on mb_type_B. * * Results: *      The various decoded values for macro_block_type in *      bidirectionally-coded pictures or ERROR for unbound values will *      be placed in the locations specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeMBTypeB(quant, motion_fwd, motion_bwd, pat, intra)	\{									\  unsigned int index;							\									\  show_bits6(index);							\									\  quant = mb_type_B[index].mb_quant;					\  motion_fwd = mb_type_B[index].mb_motion_forward;			\  motion_bwd = mb_type_B[index].mb_motion_backward;			\  pat = mb_type_B[index].mb_pattern;					\  intra = mb_type_B[index].mb_intra;					\  flush_bits(mb_type_B[index].num_bits);				\}/* *-------------------------------------------------------------- * * DecodeMBTypeI -- * *      Huffman Decoder for macro_block_type in intra-coded pictures; *      locations in which the decoded results: macroblock_quant, *      macroblock_motion_forward, macro_block_motion_backward, *      macroblock_pattern, macro_block_intra, will be placed are *      being passed as argument. * * Results: *      The various decoded values for macro_block_type in intra-coded *      pictures or ERROR for unbound values will be placed in the *      locations specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeMBTypeI(quant, motion_fwd, motion_bwd, pat, intra)	\{									\  unsigned int index;							\  static int quantTbl[4] = {ERROR, 1, 0, 0};				\									\  show_bits2(index);							\									\  motion_fwd = 0;							\  motion_bwd = 0;							\  pat = 0;								\  intra = 1;								\  quant = quantTbl[index];						\  if (index) {								\    flush_bits (1 + quant);						\  }									\}/* *-------------------------------------------------------------- * * DecodeMBTypeP -- * *      Huffman Decoder for macro_block_type in predictive-coded pictures; *      locations in which the decoded results: macroblock_quant, *      macroblock_motion_forward, macro_block_motion_backward, *      macroblock_pattern, macro_block_intra, will be placed are *      being passed as argument. The decoded values are obtained by *      doing a table lookup on mb_type_P. * * Results: *      The various decoded values for macro_block_type in *      predictive-coded pictures or ERROR for unbound values will be *      placed in the locations specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeMBTypeP(quant, motion_fwd, motion_bwd, pat, intra)	\{									\  unsigned int index;							\									\  show_bits6(index);							\									\  quant = mb_type_P[index].mb_quant;					\  motion_fwd = mb_type_P[index].mb_motion_forward;			\  motion_bwd = mb_type_P[index].mb_motion_backward;			\  pat = mb_type_P[index].mb_pattern;					\  intra = mb_type_P[index].mb_intra;					\									\  flush_bits(mb_type_P[index].num_bits);				\}/* *-------------------------------------------------------------- * * DecodeCBP -- * *      Huffman Decoder for coded_block_pattern; location in which the *      decoded result will be placed is being passed as argument. The *      decoded values are obtained by doing a table lookup on *      coded_block_pattern. * * Results: *      The decoded value for coded_block_pattern or ERROR for unbound *      values will be placed in the location specified. * * Side effects: *      Bit stream is irreversibly parsed. * *-------------------------------------------------------------- */#define DecodeCBP(coded_bp)						\{									\  unsigned int index;							\									\  show_bits9(index);							\  coded_bp = coded_block_pattern[index].cbp;				\  flush_bits(coded_block_pattern[index].num_bits);			\}