static void calc_scales(DCAContext *c) { int band, ch; for (band = 0; band < 32; band++) for (ch = 0; ch < c->fullband_channels; ch++) c->scale_factor[band][ch] = calc_one_scale(c->peak_cb[band][ch], c->abits[band][ch], &c->quant[band][ch]); if (c->lfe_channel) c->lfe_scale_factor = calc_one_scale(c->lfe_peak_cb, 11, &c->lfe_quant); }
static void calc_lfe_scales(DCAEncContext *c) { if (c->lfe_channel) c->lfe_scale_factor = calc_one_scale(c->lfe_peak_cb, 11, &c->lfe_quant); }
static int init_quantization_noise(DCAEncContext *c, int noise) { int ch, band, ret = 0; uint32_t huff_bit_count_accum[MAX_CHANNELS][DCA_CODE_BOOKS][7]; uint32_t clc_bit_count_accum[MAX_CHANNELS][DCA_CODE_BOOKS]; uint32_t bits_counter = 0; c->consumed_bits = 132 + 333 * c->fullband_channels; if (c->lfe_channel) c->consumed_bits += 72; /* attempt to guess the bit distribution based on the prevoius frame */ for (ch = 0; ch < c->fullband_channels; ch++) { for (band = 0; band < 32; band++) { int snr_cb = c->peak_cb[ch][band] - c->band_masking_cb[band] - noise; if (snr_cb >= 1312) { c->abits[ch][band] = 26; ret |= USED_26ABITS; } else if (snr_cb >= 222) { c->abits[ch][band] = 8 + mul32(snr_cb - 222, 69000000); ret |= USED_NABITS; } else if (snr_cb >= 0) { c->abits[ch][band] = 2 + mul32(snr_cb, 106000000); ret |= USED_NABITS; } else { c->abits[ch][band] = 1; ret |= USED_1ABITS; } } c->consumed_bits += set_best_abits_code(c->abits[ch], 32, &c->bit_allocation_sel[ch]); } /* Recalc scale_factor each time to get bits consumption in case of Huffman coding. It is suboptimal solution */ /* TODO: May be cache scaled values */ for (ch = 0; ch < c->fullband_channels; ch++) { for (band = 0; band < 32; band++) { c->scale_factor[ch][band] = calc_one_scale(c->peak_cb[ch][band], c->abits[ch][band], &c->quant[ch][band]); } } quantize_all(c); memset(huff_bit_count_accum, 0, MAX_CHANNELS * DCA_CODE_BOOKS * 7 * sizeof(uint32_t)); memset(clc_bit_count_accum, 0, MAX_CHANNELS * DCA_CODE_BOOKS * sizeof(uint32_t)); for (ch = 0; ch < c->fullband_channels; ch++) { for (band = 0; band < 32; band++) { if (c->abits[ch][band] && c->abits[ch][band] <= DCA_CODE_BOOKS) { accumulate_huff_bit_consumption(c->abits[ch][band], c->quantized[ch][band], huff_bit_count_accum[ch][c->abits[ch][band] - 1]); clc_bit_count_accum[ch][c->abits[ch][band] - 1] += bit_consumption[c->abits[ch][band]]; } else { bits_counter += bit_consumption[c->abits[ch][band]]; } } } for (ch = 0; ch < c->fullband_channels; ch++) { bits_counter += set_best_code(huff_bit_count_accum[ch], clc_bit_count_accum[ch], c->quant_index_sel[ch]); } c->consumed_bits += bits_counter; return ret; }