aac_enc_api_int.cpp

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

  int mdct_scaleFactor;
  int max_sfb_pred = 0;

  if (!inPointer || !outPointer)
    return AAC_NULL_PTR;

  INIT_BITSTREAM(pBS, outPointer)
  state_com = &(state->com);

  ippsZero_32s(inSignal + 2048, 2048);

  for (i = 0; i < 7; i++) {
    ics[0].scale_factor_grouping[i] = 0;
    ics[1].scale_factor_grouping[i] = 0;
  }

  ics[0].pHuffTables = (void**)&state_com->huffman_tables;
  ics[1].pHuffTables = (void**)&state_com->huffman_tables;

  ics[0].audioObjectType = state_com->audioObjectType;
  ics[1].audioObjectType = state_com->audioObjectType;

  ics[0].predictor_data_present = 0;
  ics[1].predictor_data_present = 0;

  sce.p_individual_channel_stream = &ics[0];

  cpe.p_individual_channel_stream_0 = &ics[0];
  cpe.p_individual_channel_stream_1 = &ics[1];

  numCh = state_com->m_channel_number;

  for (ch = 0; ch < numCh; ch++) {
    state_com->buff[ch] =
      state->m_buff_pointers[3*ch+state_com->m_buff_next_index];
  }

  ippsDeinterleave_16s(inPointer, numCh, 1024, state_com->buff);

  for (ch = 0; ch < numCh; ch += procCh) {
    procCh = 1;
    if (state_com->chInfo[ch].element_id == ID_CPE)
      procCh = 2;

    for (i = 0; i < procCh; i++) {
      if (state_com->chInfo[ch].element_id != ID_LFE) {
        state->psychoacoustic_block_com.input_data[0] =
          state->m_buff_pointers[3*(ch+i)+state_com->m_buff_curr_index];

        state->psychoacoustic_block_com.input_data[1] =
          state->m_buff_pointers[3*(ch+i)+state_com->m_buff_next_index];

        Psychoacoustic(&state->psychoacoustic_block[ch+i],
                       &state->psychoacoustic_block_com);
      } else {
        state->psychoacoustic_block[ch+i].block_type = ONLY_LONG_SEQUENCE;
      }
      ics[i].windows_sequence =
        state->psychoacoustic_block[ch+i].block_type;
      ics[i].window_shape = 1;
    }

    /* available_bits counting */
    available_bits = state_com->chInfo[ch].mean_bits;
    bits_in_buf = state_com->chInfo[ch].bits_in_buf;
    max_bits_in_buf = state_com->chInfo[ch].max_bits_in_buf;

    used_bits = 3; /* Syntactic element ID */

    if (procCh == 1) {
      used_bits += enc_single_channel_element(&sce,
          state_com->chInfo[ch].element_instance_tag, pBS, 0);
    } else {
      if (ics[0].windows_sequence == ics[1].windows_sequence) {
        cpe.common_window = 1;
      } else {
        cpe.common_window = 0;
      }

      used_bits += enc_channel_pair_element(&cpe,
          state_com->chInfo[ch].element_instance_tag, pBS, 0);
    }

    lim_bits = (29491 * max_bits_in_buf) >> 15; /* 0.9 in Q15 */

    if (bits_in_buf > lim_bits) {
      available_bits += bits_in_buf - lim_bits;
      bits_from_buffer = lim_bits;
    } else {
      available_bits = available_bits - (available_bits >> 3);
      bits_from_buffer = bits_in_buf;
    }

    available_bits -= used_bits;
    available_bits /= procCh;
    com_additional_bits = 0;

    for (i = 0; i < procCh; i++) {
      additional_bits[i] =
        state->psychoacoustic_block[ch+i].curr_frame_PE - 1400;

      additional_bits[i] = (additional_bits[i] * 3) >> 2;

      if (additional_bits[i] < 0) {
        additional_bits[i] = 0;
      } else if (additional_bits[i] > (available_bits + (available_bits >> 1))) {
        additional_bits[i] = available_bits + (available_bits >> 1);
      } else if ((ics[i].windows_sequence == EIGHT_SHORT_SEQUENCE) &&
                  (additional_bits[i] < (available_bits >> 1))) {
        additional_bits[i] = available_bits >> 1;
      }
      com_additional_bits += additional_bits[i];
    }

    norm_bits = 0;

    if (com_additional_bits > bits_from_buffer) {
      norm_bits = (bits_from_buffer * 32768) / com_additional_bits;
    }

    for (i = 0; i < procCh; i++) {
      if (com_additional_bits > bits_from_buffer) {
        additional_bits[i] = (additional_bits[i] * norm_bits) >> 15;
      }

      quantization_block.available_bits =
        available_bits + additional_bits[i];

      //quantization_block.available_bits =
      //  (state_com->chInfo[ch].mean_bits - used_bits) /procCh;

      if (quantization_block.available_bits > 768 * 8) {
        quantization_block.available_bits = 768 * 8;
      } else if (quantization_block.available_bits < 0) {
        quantization_block.available_bits = 0;
      }

      win_seq = ics[i].windows_sequence;
      win_shape = ics[i].window_shape;

      /*if (pBlock->block_type == EIGHT_SHORT_SEQUENCE) {
        state->quantization_block[i].p_smr =
          pBlock->smr_short[pBlock->nb_curr_index];
      } else {
        state->quantization_block[i].p_smr =
          pBlock->smr_long[pBlock->nb_curr_index];
      }*/


      ics[i].num_sfb = state_com->real_num_sfb[win_seq];

      if (state_com->chInfo[ch+i].element_id != ID_LFE) {
        ics[i].max_sfb = state_com->real_max_sfb[win_seq];
      } else {
        ics[i].max_sfb = state_com->real_max_sfb_lfe[win_seq];
      }

      ics[i].sfb_offset = state_com->sfb_offset[win_seq];

      Filterbank_enc(&(state->filterbank_enc),
                     state->m_buff_pointers[3*(ch+i)+state_com->m_buff_prev_index],
                     state->m_buff_pointers[3*(ch+i)+state_com->m_buff_curr_index],
                     win_seq, win_shape,
                     state_com->chInfo[ch+i].prev_window_shape,
                     mdct_line, &mdct_scaleFactor);

      p_mdct_line_pred = NULL;

      if (state_com->audioObjectType == AOT_AAC_LTP) {
        if (win_seq != EIGHT_SHORT_SEQUENCE) {
          Ipp16s *tmp_ptr;

          max_sfb_pred = ics[i].max_sfb;
          if (max_sfb_pred > MAX_LTP_SFB_LONG) max_sfb_pred = MAX_LTP_SFB_LONG;

          tmp_ptr = state->m_buff_pointers[3*(ch+i)+state_com->m_buff_prev_index];
          for (j = 0; j < 1024; j++) {
            inSignal[j] = tmp_ptr[j] << 16;
          }

          tmp_ptr = state->m_buff_pointers[3*(ch+i)+state_com->m_buff_curr_index];
          for (j = 0; j < 1024; j++) {
            inSignal[j + 1024] = tmp_ptr[j] << 16;
          }

          ltpEncode(inSignal, state->ltp_buff[ch+i], predictedBuf,
                    &(ics[i].ltp_lag), &(ics[i].ltp_coef),
                    state->corrFft, state->corrBuff);

          if (ics[i].ltp_lag >= 0) {
            FilterbankEncInt(&(state->filterbank),
                             predictedBuf, predictedBuf + 1024,
                             win_seq, win_shape,
                             state_com->chInfo[ch+i].prev_window_shape,
                             predictedSpectrum);

            ippsZero_32s(predictedSpectrum + state_com->sfb_offset[win_seq][max_sfb_pred],
                         1024 - state_com->sfb_offset[win_seq][max_sfb_pred]);

            ippsConvert_32s16s_Sfs(predictedSpectrum, predictedSpectrum16s, 1024, mdct_scaleFactor + 2);

            p_mdct_line_pred = mdct_line_pred;
            ippsSub_16s(predictedSpectrum16s, mdct_line, p_mdct_line_pred, 1024);
          }
        }
      }

      ics[i].num_window_groups = 1;
      ics[i].len_window_group[0] = 1;
      p_mdct_line = mdct_line;

      /* short block interleave */
      if (win_seq == EIGHT_SHORT_SEQUENCE) {
        int *len_window_group = ics[i].len_window_group;
        int *scale_factor_grouping = ics[i].scale_factor_grouping;
        int *tmp_sfb_offset = state_com->sfb_offset[win_seq];
        int num_window_groups = 1;
        int max_sfb = ics[i].max_sfb;
        Ipp16s *ptrIn = mdct_line;
        Ipp16s *ptrOut = mdct_line_i;
        int g, w, ind;

        for (j = 0; j < 7; j++) {
          if (scale_factor_grouping[j] == 0) {
            len_window_group[num_window_groups] = 1;
            num_window_groups++;
          } else {
            len_window_group[num_window_groups - 1]++;
          }
        }
        ics[i].num_window_groups = num_window_groups;

        if (num_window_groups != 8) {

          sfb_offset[0] = 0;
          ind = 1;

          for (g = 0; g < num_window_groups; g++) {
            for (sfb = 0; sfb < max_sfb; sfb++) {
              int sfb_start = tmp_sfb_offset[sfb];
              int sfb_end = tmp_sfb_offset[sfb+1];
              int sfb_width = sfb_end - sfb_start;

              sfb_offset[ind] = sfb_offset[ind - 1] +
                sfb_width * len_window_group[g];
              ind++;

              for (j = 0; j < len_window_group[g]; j++) {
                for (w = 0; w < sfb_width; w++) {
                  *ptrOut = ptrIn[w + sfb_start + 128 * j];
                   ptrOut++;
                }
              }
            }
            ptrIn += 128 * len_window_group[g];
          }
          ics[i].sfb_offset = sfb_offset;
          p_mdct_line = mdct_line_i;
          ics[i].num_sfb = max_sfb;
        }
      }

      quantization_block.common_scalefactor_update =
        &(state_com->chInfo[ch+i].common_scalefactor_update);
      quantization_block.last_frame_common_scalefactor =
        &(state_com->chInfo[ch+i].last_frame_common_scalefactor);

      Quantization(&quantization_block, &ics[i],
                   p_mdct_line, p_mdct_line_pred, mdct_scaleFactor);

      if (state_com->audioObjectType == AOT_AAC_LTP) {
        if (win_seq != EIGHT_SHORT_SEQUENCE) {
          ics[i].predictor_data_present = ics[i].ltp_data_present;
          if (ics[i].predictor_data_present) {
            for (sfb = 0; sfb < max_sfb_pred; sfb++) {
              if (!ics[i].ltp_long_used[sfb]) {
                int begin = ics[i].sfb_offset[sfb];
                int end = ics[i].sfb_offset[sfb+1];

                for (j = begin; j < end; j++) {
                  predictedSpectrum[j] = 0;
                }
              }
            }
          }
        }

        ltpBufferUpdate(state->ltp_buff[ch+i], state->ltp_overlap[ch+i],
                        predictedSpectrum, &ics[i],
                        &(state->filterbank),
                        state_com->sfb_offset[EIGHT_SHORT_SEQUENCE],
                        state_com->chInfo[ch+i].prev_window_shape,
                        ics[i].predictor_data_present);
      }

      state_com->chInfo[ch+i].prev_window_shape = win_shape;
    }

    GET_BITS_COUNT(pBS, save_bits)

    /* Put bits into bitstream */
    if (state_com->chInfo[ch].element_id == ID_SCE) {
      PUT_BITS(pBS,ID_SCE,3);
      enc_single_channel_element(&sce, state_com->chInfo[ch].element_instance_tag,
                                 pBS, 1);
    } else if (state_com->chInfo[ch].element_id == ID_LFE) {
      PUT_BITS(pBS,ID_LFE,3);
      enc_single_channel_element(&sce, state_com->chInfo[ch].element_instance_tag,
                                 pBS, 1);
    } else {
      if (cpe.common_window) {
        if (state_com->audioObjectType == AOT_AAC_LTP) {
          if (ics[1].predictor_data_present) {
            ics[0].predictor_data_present = 1;
          }
        }
      }
      PUT_BITS(pBS,ID_CPE,3);
      enc_channel_pair_element(&cpe, state_com->chInfo[ch].element_instance_tag,
                               pBS, 1);
    }

    GET_BITS_COUNT(pBS, used_bits)
    used_bits -= save_bits;

    state_com->chInfo[ch].bits_in_buf +=
      state_com->chInfo[ch].mean_bits - used_bits;
  }

  PUT_BITS(pBS,ID_END,3);
  SAVE_BITSTREAM(pBS)
  Byte_alignment(pBS);

  state_com->m_buff_prev_index++;
  if (state_com->m_buff_prev_index == 3)
    state_com->m_buff_prev_index = 0;

  state_com->m_buff_curr_index++;
  if (state_com->m_buff_curr_index == 3)
    state_com->m_buff_curr_index = 0;

  state_com->m_buff_next_index++;
  if (state_com->m_buff_next_index == 3)
    state_com->m_buff_next_index = 0;

  state->psychoacoustic_block_com.prev_prev_f_r_index = state_com->m_buff_prev_index;
  state->psychoacoustic_block_com.prev_f_r_index = state_com->m_buff_curr_index;
  state->psychoacoustic_block_com.current_f_r_index = state_com->m_buff_next_index;

  state->psychoacoustic_block_com.nb_curr_index++;
  state->psychoacoustic_block_com.nb_curr_index &= 1;

  state->psychoacoustic_block_com.nb_prev_index++;
  state->psychoacoustic_block_com.nb_prev_index &= 1;

  GET_BITS_COUNT(pBS, (*encodedBytes))
  *encodedBytes >>= 3;

  state_com->m_frame_number++;

  return AAC_OK;
}

/****************************************************************************/

AACStatus aacencClose(AACEnc *state)
{
  if (state == NULL)
    return AAC_OK;

  FreePsychoacousticCom(&state->psychoacoustic_block_com);
  FreeFilterbank_enc(&state->filterbank_enc);
  FreeFilterbankInt(&state->filterbank);
  FreeHuffmanTables((IppsVLCEncodeSpec_32s**)(&state->com.huffman_tables));
  ippsFree(state->com.real_state);

  return AAC_OK;
}

/********************************************************************/

AACStatus aacencGetSampleFrequencyIndex(int *freq_index,
                                        AACEnc *state)
{
  if (!state)
    return AAC_NULL_PTR;

  *freq_index = state->com.sampling_frequency_index;
  return AAC_OK;
}

/********************************************************************/

AACStatus aacencGetDuration(float *p_duration,
                            AACEnc *state)
{
  float   duration;

  duration = (float)(state->com.m_frame_number) * 1024;
  *p_duration = duration / (float)(state->com.m_sampling_frequency);

  return AAC_OK;
}

/********************************************************************/