mpc_decoder.c

wince下著名的视频播放器源码

                    L[0] = L[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    L[1] = L[0] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    L[2] = L[1];
                    break;
                case 2:
                    L[0] = L[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    L[1] = L[0];
                    L[2] = L[1] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    break;
                case 0:
                    L[0] = L[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    L[1] = L[0] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    L[2] = L[1] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    break;
                default:
                    return;
                    break;
                }
            }
            /************ SCF ************/
            else
            {
                switch (d->SCFI_L[n])
                {
                case 3:
                    L[0] = mpc_decoder_bitstream_read(d,  6);
                    L[1] = L[0];
                    L[2] = L[1];
                    break;
                case 1:
                    L[0] = mpc_decoder_bitstream_read(d,  6);
                    L[1] = mpc_decoder_bitstream_read(d,  6);
                    L[2] = L[1];
                    break;
                case 2:
                    L[0] = mpc_decoder_bitstream_read(d,  6);
                    L[1] = L[0];
                    L[2] = mpc_decoder_bitstream_read(d,  6);
                    break;
                case 0:
                    L[0] = mpc_decoder_bitstream_read(d,  6);
                    L[1] = mpc_decoder_bitstream_read(d,  6);
                    L[2] = mpc_decoder_bitstream_read(d,  6);
                    break;
                default:
                    return;
                    break;
                }
            }
            // update Reference for DSCF
            d->DSCF_Reference_L[n] = L[2];
        }
        if (*ResR)
        {
            R[2] = d->DSCF_Reference_R[n];
            /*********** DSCF ************/
            if (d->DSCF_Flag_R[n]==1)
            {
                switch (d->SCFI_R[n])
                {
                case 3:
                    R[0] = R[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[1] = R[0];
                    R[2] = R[1];
                    break;
                case 1:
                    R[0] = R[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[1] = R[0] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[2] = R[1];
                    break;
                case 2:
                    R[0] = R[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[1] = R[0];
                    R[2] = R[1] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    break;
                case 0:
                    R[0] = R[2] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[1] = R[0] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    R[2] = R[1] + mpc_decoder_huffman_decode_fast(d,  d->DSCF_Entropie);
                    break;
                default:
                    return;
                    break;
                }
            }
            /************ SCF ************/
            else
            {
                switch (d->SCFI_R[n])
                {
                case 3:
                    R[0] = mpc_decoder_bitstream_read(d, 6);
                    R[1] = R[0];
                    R[2] = R[1];
                    break;
                case 1:
                    R[0] = mpc_decoder_bitstream_read(d, 6);
                    R[1] = mpc_decoder_bitstream_read(d, 6);
                    R[2] = R[1];
                    break;
                case 2:
                    R[0] = mpc_decoder_bitstream_read(d, 6);
                    R[1] = R[0];
                    R[2] = mpc_decoder_bitstream_read(d, 6);
                    break;
                case 0:
                    R[0] = mpc_decoder_bitstream_read(d, 6);
                    R[1] = mpc_decoder_bitstream_read(d, 6);
                    R[2] = mpc_decoder_bitstream_read(d, 6);
                    break;
                default:
                    return;
                    break;
                }
            }
            // update Reference for DSCF
            d->DSCF_Reference_R[n] = R[2];
        }
    }

    /**************************** Samples ****************************/
    ResL = d->Res_L;
    ResR = d->Res_R;
    for (n=0; n <= Max_used_Band; ++n, ++ResL, ++ResR)
    {
        // setting pointers
        x1 = d->SampleHuff[*ResL];
        x2 = d->SampleHuff[*ResR];
        L = d->Q[n].L;
        R = d->Q[n].R;

        if (x1!=NULL || x2!=NULL)
            for (k=0; k<36; ++k)
            {
                if (x1 != NULL) *L++ = mpc_decoder_huffman_decode_fast(d,  x1);
                if (x2 != NULL) *R++ = mpc_decoder_huffman_decode_fast(d,  x2);
            }

        if (*ResL>7 || *ResR>7)
            for (k=0; k<36; ++k)
            {
                if (*ResL>7) *L++ = (mpc_int32_t)mpc_decoder_bitstream_read(d,  Res_bit[*ResL]) - Dc[*ResL];
                if (*ResR>7) *R++ = (mpc_int32_t)mpc_decoder_bitstream_read(d,  Res_bit[*ResR]) - Dc[*ResR];
            }
    }
}

/****************************************** SV 7 ******************************************/
void
mpc_decoder_read_bitstream_sv7(mpc_decoder *d) 
{
    // these arrays hold decoding results for bundled quantizers (3- and 5-step)
    static const mpc_int32_t idx30[] = { -1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1,-1, 0, 1};
    static const mpc_int32_t idx31[] = { -1,-1,-1, 0, 0, 0, 1, 1, 1,-1,-1,-1, 0, 0, 0, 1, 1, 1,-1,-1,-1, 0, 0, 0, 1, 1, 1};
    static const mpc_int32_t idx32[] = { -1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1};
    static const mpc_int32_t idx50[] = { -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2};
    static const mpc_int32_t idx51[] = { -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2};

    mpc_int32_t n,k;
    mpc_int32_t Max_used_Band=0;
    const HuffmanTyp *Table;
    mpc_int32_t idx;
    mpc_int32_t *L   ,*R;
    mpc_int32_t *ResL,*ResR;
    mpc_uint32_t tmp;

    /***************************** Header *****************************/
    ResL  = d->Res_L;
    ResR  = d->Res_R;

    // first subband
    *ResL = mpc_decoder_bitstream_read(d, 4);
    *ResR = mpc_decoder_bitstream_read(d, 4);
    if (d->MS_used && !(*ResL==0 && *ResR==0)) {
        d->MS_Flag[0] = mpc_decoder_bitstream_read(d, 1);
    }

    // consecutive subbands
    ++ResL; ++ResR; // increase pointers
    for (n=1; n <= d->Max_Band; ++n, ++ResL, ++ResR)
    {
        idx   = mpc_decoder_huffman_decode_fast(d, d->HuffHdr);
        *ResL = (idx!=4) ? *(ResL-1) + idx : mpc_decoder_bitstream_read(d, 4);

        idx   = mpc_decoder_huffman_decode_fast(d, d->HuffHdr);
        *ResR = (idx!=4) ? *(ResR-1) + idx : mpc_decoder_bitstream_read(d, 4);

        if (d->MS_used && !(*ResL==0 && *ResR==0)) {
            d->MS_Flag[n] = mpc_decoder_bitstream_read(d, 1);
        }

        // only perform following procedures up to the maximum non-zero subband
        if (*ResL!=0 || *ResR!=0) {
            Max_used_Band = n;
        }
    }
    /****************************** SCFI ******************************/
    L     = d->SCFI_L;
    R     = d->SCFI_R;
    ResL  = d->Res_L;
    ResR  = d->Res_R;
    for (n=0; n <= Max_used_Band; ++n, ++L, ++R, ++ResL, ++ResR) {
        if (*ResL) *L = mpc_decoder_huffman_decode_faster(d, d->HuffSCFI);
        if (*ResR) *R = mpc_decoder_huffman_decode_faster(d, d->HuffSCFI);
    }

    /**************************** SCF/DSCF ****************************/
    ResL  = d->Res_L;
    ResR  = d->Res_R;
    L     = d->SCF_Index_L[0];
    R     = d->SCF_Index_R[0];
    for (n=0; n<=Max_used_Band; ++n, ++ResL, ++ResR, L+=3, R+=3) {
        if (*ResL)
        {
            L[2] = d->DSCF_Reference_L[n];
            switch (d->SCFI_L[n])
            {
            case 1:
                idx  = mpc_decoder_huffman_decode_fast(d, d->HuffDSCF);
                L[0] = (idx!=8) ? L[2] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d, d->HuffDSCF);
                L[1] = (idx!=8) ? L[0] + idx : mpc_decoder_bitstream_read(d, 6);
                L[2] = L[1];
                break;
            case 3:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[0] = (idx!=8) ? L[2] + idx : mpc_decoder_bitstream_read(d, 6);
                L[1] = L[0];
                L[2] = L[1];
                break;
            case 2:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[0] = (idx!=8) ? L[2] + idx : mpc_decoder_bitstream_read(d, 6);
                L[1] = L[0];
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[2] = (idx!=8) ? L[1] + idx : mpc_decoder_bitstream_read(d, 6);
                break;
            case 0:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[0] = (idx!=8) ? L[2] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[1] = (idx!=8) ? L[0] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                L[2] = (idx!=8) ? L[1] + idx : mpc_decoder_bitstream_read(d, 6);
                break;
            default:
                return;
                break;
            }
            // update Reference for DSCF
            d->DSCF_Reference_L[n] = L[2];
        }
        if (*ResR)
        {
            R[2] = d->DSCF_Reference_R[n];
            switch (d->SCFI_R[n])
            {
            case 1:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[0] = (idx!=8) ? R[2] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[1] = (idx!=8) ? R[0] + idx : mpc_decoder_bitstream_read(d, 6);
                R[2] = R[1];
                break;
            case 3:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[0] = (idx!=8) ? R[2] + idx : mpc_decoder_bitstream_read(d, 6);
                R[1] = R[0];
                R[2] = R[1];
                break;
            case 2:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[0] = (idx!=8) ? R[2] + idx : mpc_decoder_bitstream_read(d, 6);
                R[1] = R[0];
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[2] = (idx!=8) ? R[1] + idx : mpc_decoder_bitstream_read(d, 6);
                break;
            case 0:
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[0] = (idx!=8) ? R[2] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[1] = (idx!=8) ? R[0] + idx : mpc_decoder_bitstream_read(d, 6);
                idx  = mpc_decoder_huffman_decode_fast(d,  d->HuffDSCF);
                R[2] = (idx!=8) ? R[1] + idx : mpc_decoder_bitstream_read(d, 6);
                break;
            default:
                return;
                break;
            }
            // update Reference for DSCF
            d->DSCF_Reference_R[n] = R[2];
        }
    }
    /***************************** Samples ****************************/
    ResL = d->Res_L;
    ResR = d->Res_R;
    L    = d->Q[0].L;
    R    = d->Q[0].R;
    for (n=0; n <= Max_used_Band; ++n, ++ResL, ++ResR, L+=36, R+=36)
    {
        /************** links **************/
        switch (*ResL)
        {
        case  -2: case  -3: case  -4: case  -5: case  -6: case  -7: case  -8: case  -9:
        case -10: case -11: case -12: case -13: case -14: case -15: case -16: case -17:
            L += 36;
            break;
        case -1:
            for (k=0; k<36; k++ ) {
                tmp  = random_int(d);
                *L++ = ((tmp >> 24) & 0xFF) + ((tmp >> 16) & 0xFF) + ((tmp >>  8) & 0xFF) + ((tmp >>  0) & 0xFF) - 510;
            }
            break;
        case 0:
            L += 36;// increase pointer
            break;
        case 1:
            Table = d->HuffQ[mpc_decoder_bitstream_read(d, 1)][1];
            for (k=0; k<12; ++k)
            {
                idx = mpc_decoder_huffman_decode_fast(d,  Table);
                *L++ = idx30[idx];
                *L++ = idx31[idx];
                *L++ = idx32[idx];
            }
            break;
        case 2:
            Table = d->HuffQ[mpc_decoder_bitstream_read(d, 1)][2];
            for (k=0; k<18; ++k)
            {
                idx = mpc_decoder_huffman_decode_fast(d,  Table);
                *L++ = idx50[idx];
                *L++ = idx51[idx];
            }
            break;
        case 3:
        case 4:
            Table = d->HuffQ[mpc_decoder_bitstream_read(d, 1)][*ResL];
            for (k=0; k<36; ++k)
                *L++ = mpc_decoder_huffman_decode_faster(d, Table);
            break;
        case 5:
            Table = d->HuffQ[mpc_decoder_bitstream_read(d, 1)][*ResL];