PeerStreamer

 * Run the bit allocation with a given SNR offset.

 * This calculates the bit allocation pointers that will be used to determine

 * the quantization of each mantissa.

 */

static int bit_alloc(AC3EncodeContext *s,

                     int16_t mask[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS],

                     int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],

                     uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS],

{

    int blk, ch;

    snr_offset = (((coarse_snr_offset - 15) << 4) + fine_snr_offset) << 2;

    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {

        s->mant1_cnt = 0;

        s->mant2_cnt = 0;

                                      s->nb_coefs[ch], snr_offset,

                                      s->bit_alloc.floor, ff_ac3_bap_tab,

                                      bap[blk][ch]);

        }

    }

}

                                  uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS])

{

    int ch;

    int coarse_snr_offset, fine_snr_offset;

    uint8_t bap1[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];

    int16_t psd[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS];

    /* now the big work begins : do the bit allocation. Modify the snr

       offset until we can pack everything in the requested frame size */

    coarse_snr_offset = s->coarse_snr_offset;

    while (coarse_snr_offset >= 0 &&

        coarse_snr_offset -= SNR_INC1;

    if (coarse_snr_offset < 0) {

        return AVERROR(EINVAL);

    }

    while (coarse_snr_offset + SNR_INC1 <= 63 &&

        coarse_snr_offset += SNR_INC1;

        memcpy(bap, bap1, sizeof(bap1));

    }

    while (coarse_snr_offset + 1 <= 63 &&

        coarse_snr_offset++;

        memcpy(bap, bap1, sizeof(bap1));

    }

    fine_snr_offset = 0;

    while (fine_snr_offset + SNR_INC1 <= 15 &&

        fine_snr_offset += SNR_INC1;

        memcpy(bap, bap1, sizeof(bap1));

    }

    while (fine_snr_offset + 1 <= 15 &&

        fine_snr_offset++;

        memcpy(bap, bap1, sizeof(bap1));

    }