| /****************************************************************************** |
| * |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ***************************************************************************** |
| * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <string.h> |
| |
| #include "impd_type_def.h" |
| #include "impd_drc_extr_delta_coded_info.h" |
| #include "impd_drc_common.h" |
| #include "impd_drc_struct.h" |
| #include "impd_drc_filter_bank.h" |
| #include "impd_drc_multi_band.h" |
| #include "impd_drc_gain_dec.h" |
| #include "impd_drc_process_audio.h" |
| |
| WORD32 impd_apply_gains_and_add( |
| ia_drc_instructions_struct* pstr_drc_instruction_arr, |
| const WORD32 drc_instructions_index, |
| ia_drc_params_struct* ia_drc_params_struct, |
| ia_gain_buffer_struct* pstr_gain_buf, |
| shape_filter_block shape_filter_block[], FLOAT32* deinterleaved_audio[], |
| |
| FLOAT32* channel_audio[], WORD32 impd_apply_gains) { |
| WORD32 c, b, g, i; |
| WORD32 offset = 0, signalIndex = 0; |
| WORD32 gainIndexForGroup[CHANNEL_GROUP_COUNT_MAX]; |
| WORD32 signalIndexForChannel[MAX_CHANNEL_COUNT]; |
| FLOAT32* lpcm_gains; |
| FLOAT32 sum; |
| FLOAT32 drc_gain_last, gainThr; |
| WORD32 iEnd, iStart; |
| ia_drc_instructions_struct* str_drc_instruction_str = |
| &(pstr_drc_instruction_arr[drc_instructions_index]); |
| |
| if (drc_instructions_index >= 0) { |
| str_drc_instruction_str = |
| &(pstr_drc_instruction_arr[drc_instructions_index]); |
| { |
| if (str_drc_instruction_str->drc_set_id > 0) { |
| if (ia_drc_params_struct->delay_mode == DELAY_MODE_LOW_DELAY) { |
| offset = ia_drc_params_struct->drc_frame_size; |
| } |
| gainIndexForGroup[0] = 0; |
| for (g = 0; g < str_drc_instruction_str->num_drc_ch_groups - 1; g++) { |
| gainIndexForGroup[g + 1] = |
| gainIndexForGroup[g] + |
| str_drc_instruction_str->band_count_of_ch_group[g]; |
| } |
| signalIndexForChannel[0] = 0; |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan - 1; c++) { |
| if (str_drc_instruction_str->channel_group_of_ch[c] >= 0) { |
| signalIndexForChannel[c + 1] = |
| signalIndexForChannel[c] + |
| str_drc_instruction_str->band_count_of_ch_group |
| [str_drc_instruction_str->channel_group_of_ch[c]]; |
| } else { |
| signalIndexForChannel[c + 1] = signalIndexForChannel[c] + 1; |
| } |
| } |
| |
| for (g = 0; g < str_drc_instruction_str->num_drc_ch_groups; g++) { |
| for (b = 0; b < str_drc_instruction_str->band_count_of_ch_group[g]; |
| b++) { |
| if (str_drc_instruction_str->ch_group_parametric_drc_flag[g] == 0) { |
| lpcm_gains = |
| pstr_gain_buf->buf_interpolation[gainIndexForGroup[g] + b] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY - ia_drc_params_struct->gain_delay_samples - |
| ia_drc_params_struct->audio_delay_samples + offset; |
| } else { |
| lpcm_gains = |
| pstr_gain_buf->buf_interpolation[gainIndexForGroup[g] + b] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY + |
| str_drc_instruction_str |
| ->parametric_drc_look_ahead_samples[g] - |
| ia_drc_params_struct->audio_delay_samples; |
| } |
| iEnd = 0; |
| iStart = 0; |
| while (iEnd < ia_drc_params_struct->drc_frame_size) { |
| if (shape_filter_block[g].shape_flter_block_flag) { |
| drc_gain_last = shape_filter_block[g].drc_gain_last; |
| gainThr = 0.0001f * drc_gain_last; |
| while ((iEnd < ia_drc_params_struct->drc_frame_size) && |
| (fabs(lpcm_gains[iEnd] - drc_gain_last) <= gainThr)) |
| iEnd++; |
| } else { |
| iEnd = ia_drc_params_struct->drc_frame_size; |
| } |
| |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan; c++) |
| |
| { |
| if (g == str_drc_instruction_str->channel_group_of_ch[c]) { |
| signalIndex = signalIndexForChannel[c] + b; |
| |
| if (impd_apply_gains == 1) { |
| impd_shape_filt_block_time_process( |
| &shape_filter_block[g], &lpcm_gains[0], signalIndex, |
| &deinterleaved_audio[signalIndex][0], iStart, iEnd); |
| |
| } else { |
| for (i = iStart; i < iEnd; i++) { |
| deinterleaved_audio[signalIndex][i] = lpcm_gains[i]; |
| } |
| } |
| } |
| } |
| if ((iEnd < ia_drc_params_struct->drc_frame_size) && |
| (shape_filter_block[g].shape_flter_block_flag)) { |
| impd_shape_filt_block_adapt(lpcm_gains[iEnd], |
| &shape_filter_block[g]); |
| } |
| iStart = iEnd; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| signalIndex = 0; |
| |
| if (str_drc_instruction_str->drc_set_id > 0) { |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan; c++) |
| |
| { |
| g = str_drc_instruction_str->channel_group_of_ch[c]; |
| if (g >= 0) { |
| for (i = 0; i < ia_drc_params_struct->drc_frame_size; i++) { |
| sum = 0.0f; |
| for (b = 0; b < str_drc_instruction_str->band_count_of_ch_group[g]; |
| b++) { |
| sum += deinterleaved_audio[signalIndex + b][i]; |
| } |
| |
| channel_audio[c][i] = sum; |
| } |
| signalIndex += str_drc_instruction_str->band_count_of_ch_group[g]; |
| } else { |
| for (i = 0; i < ia_drc_params_struct->drc_frame_size; i++) { |
| channel_audio[c][i] = deinterleaved_audio[signalIndex][i]; |
| } |
| signalIndex++; |
| } |
| } |
| } else { |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan; c++) |
| |
| { |
| for (i = 0; i < ia_drc_params_struct->drc_frame_size; i++) { |
| channel_audio[c][i] = deinterleaved_audio[c][i]; |
| } |
| } |
| } |
| |
| return (0); |
| } |
| |
| /* subband-domain DRC: in-place application of DRC gains to audio frame */ |
| WORD32 |
| impd_apply_gains_subband(ia_drc_instructions_struct* pstr_drc_instruction_arr, |
| const WORD32 drc_instructions_index, |
| ia_drc_params_struct* ia_drc_params_struct, |
| ia_gain_buffer_struct* pstr_gain_buf, |
| ia_overlap_params_struct* pstr_overlap_params, |
| FLOAT32* deinterleaved_audio_delayed_re[], |
| FLOAT32* deinterleaved_audio_delayed_im[], |
| FLOAT32* deinterleaved_audio_re[], |
| FLOAT32* deinterleaved_audio_im[]) { |
| WORD32 c, b, g, m, s; |
| WORD32 gainIndexForGroup[CHANNEL_GROUP_COUNT_MAX]; |
| FLOAT32* lpcm_gains; |
| FLOAT32 gainSb, gainLr; |
| ia_drc_instructions_struct* str_drc_instruction_str; |
| WORD32 offset = 0, signalIndex = 0; |
| WORD32 drc_frame_sizeSb = 0; |
| WORD32 nDecoderSubbands = 0; |
| WORD32 L = 0; /* L: downsampling factor */ |
| WORD32 analysisDelay = 0; |
| switch (ia_drc_params_struct->sub_band_domain_mode) { |
| case SUBBAND_DOMAIN_MODE_QMF64: |
| nDecoderSubbands = AUDIO_CODEC_SUBBAND_COUNT_QMF64; |
| L = AUDIO_CODEC_SUBBAND_DOWNSAMPLING_FACTOR_QMF64; |
| analysisDelay = AUDIO_CODEC_SUBBAND_ANALYSE_DELAY_QMF64; |
| break; |
| case SUBBAND_DOMAIN_MODE_QMF71: |
| nDecoderSubbands = AUDIO_CODEC_SUBBAND_COUNT_QMF71; |
| L = AUDIO_CODEC_SUBBAND_DOWNSAMPLING_FACTOR_QMF71; |
| analysisDelay = AUDIO_CODEC_SUBBAND_ANALYSE_DELAY_QMF71; |
| break; |
| case SUBBAND_DOMAIN_MODE_STFT256: |
| nDecoderSubbands = AUDIO_CODEC_SUBBAND_COUNT_STFT256; |
| L = AUDIO_CODEC_SUBBAND_DOWNSAMPLING_FACTOR_STFT256; |
| analysisDelay = AUDIO_CODEC_SUBBAND_ANALYSE_DELAY_STFT256; |
| break; |
| default: |
| return -1; |
| break; |
| } |
| drc_frame_sizeSb = ia_drc_params_struct->drc_frame_size / L; |
| |
| if (drc_instructions_index >= 0) { |
| str_drc_instruction_str = |
| &(pstr_drc_instruction_arr[drc_instructions_index]); |
| { |
| if (str_drc_instruction_str->drc_set_id > 0) { |
| if (ia_drc_params_struct->delay_mode == DELAY_MODE_LOW_DELAY) { |
| offset = ia_drc_params_struct->drc_frame_size; |
| } |
| gainIndexForGroup[0] = 0; |
| for (g = 0; g < str_drc_instruction_str->num_drc_ch_groups - 1; g++) { |
| gainIndexForGroup[g + 1] = |
| gainIndexForGroup[g] + |
| str_drc_instruction_str |
| ->band_count_of_ch_group[g]; /* index of first gain sequence |
| in channel group */ |
| } |
| |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan; c++) |
| |
| { |
| g = str_drc_instruction_str->channel_group_of_ch[c]; |
| if (g >= 0) { |
| for (m = 0; m < drc_frame_sizeSb; m++) { |
| if (str_drc_instruction_str->band_count_of_ch_group[g] > |
| 1) { /* multiband DRC */ |
| for (s = 0; s < nDecoderSubbands; s++) { |
| gainSb = 0.0f; |
| for (b = 0; |
| b < str_drc_instruction_str->band_count_of_ch_group[g]; |
| b++) { |
| if (str_drc_instruction_str |
| ->ch_group_parametric_drc_flag[g] == 0) { |
| lpcm_gains = |
| pstr_gain_buf |
| ->buf_interpolation[gainIndexForGroup[g] + b] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY - |
| ia_drc_params_struct->gain_delay_samples - |
| ia_drc_params_struct->audio_delay_samples + offset; |
| } else { |
| lpcm_gains = |
| pstr_gain_buf |
| ->buf_interpolation[gainIndexForGroup[g] + b] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY + |
| str_drc_instruction_str |
| ->parametric_drc_look_ahead_samples[g] - |
| ia_drc_params_struct->audio_delay_samples + |
| analysisDelay; |
| } |
| /* get gain for this timeslot by downsampling */ |
| gainLr = lpcm_gains[(m * L + (L - 1) / 2)]; |
| gainSb += pstr_overlap_params->str_group_overlap_params[g] |
| .str_band_overlap_params[b] |
| .overlap_weight[s] * |
| gainLr; |
| } |
| deinterleaved_audio_re[signalIndex][m * nDecoderSubbands + |
| s] = |
| gainSb * |
| deinterleaved_audio_delayed_re[signalIndex] |
| [m * nDecoderSubbands + s]; |
| if (ia_drc_params_struct->sub_band_domain_mode == |
| SUBBAND_DOMAIN_MODE_STFT256) { /* For STFT filterbank, the |
| real value of the |
| nyquist band is stored |
| at the imag value of the |
| first band */ |
| if (s != 0) |
| deinterleaved_audio_im[signalIndex][m * nDecoderSubbands + |
| s] = |
| gainSb * |
| deinterleaved_audio_delayed_im[signalIndex] |
| [m * nDecoderSubbands + |
| s]; |
| if (s == (nDecoderSubbands - 1)) |
| deinterleaved_audio_im[signalIndex][m * nDecoderSubbands + |
| 0] = |
| gainSb * |
| deinterleaved_audio_delayed_im[signalIndex] |
| [m * nDecoderSubbands + |
| 0]; |
| } else { |
| deinterleaved_audio_im[signalIndex][m * nDecoderSubbands + |
| s] = |
| gainSb * |
| deinterleaved_audio_delayed_im[signalIndex] |
| [m * nDecoderSubbands + |
| s]; |
| } |
| } |
| } else { /* single-band DRC */ |
| if (str_drc_instruction_str->ch_group_parametric_drc_flag[g] == |
| 0) { |
| lpcm_gains = |
| pstr_gain_buf->buf_interpolation[gainIndexForGroup[g]] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY - |
| ia_drc_params_struct->gain_delay_samples - |
| ia_drc_params_struct->audio_delay_samples + offset; |
| } else { |
| lpcm_gains = |
| pstr_gain_buf->buf_interpolation[gainIndexForGroup[g]] |
| .lpcm_gains + |
| MAX_SIGNAL_DELAY + |
| str_drc_instruction_str |
| ->parametric_drc_look_ahead_samples[g] - |
| ia_drc_params_struct->audio_delay_samples + analysisDelay; |
| } |
| /* get gain for this timeslot by downsampling */ |
| gainSb = lpcm_gains[(m * L + (L - 1) / 2)]; |
| for (s = 0; s < nDecoderSubbands; s++) { |
| deinterleaved_audio_re[signalIndex][m * nDecoderSubbands + |
| s] = |
| gainSb * |
| deinterleaved_audio_delayed_re[signalIndex] |
| [m * nDecoderSubbands + s]; |
| deinterleaved_audio_im[signalIndex][m * nDecoderSubbands + |
| s] = |
| gainSb * |
| deinterleaved_audio_delayed_im[signalIndex] |
| [m * nDecoderSubbands + s]; |
| } |
| } |
| } |
| } |
| signalIndex++; |
| } |
| } |
| } |
| } |
| return (0); |
| } |
| |
| WORD32 |
| impd_filter_banks_process(ia_drc_instructions_struct* pstr_drc_instruction_arr, |
| const WORD32 drc_instructions_index, |
| ia_drc_params_struct* ia_drc_params_struct, |
| FLOAT32* audio_io_buf[], |
| ia_audio_band_buffer_struct* audio_band_buffer, |
| ia_filter_banks_struct* ia_filter_banks_struct, |
| const WORD32 passThru) { |
| WORD32 c, g, e, i, num_bands; |
| // WORD32 err = 0; |
| FLOAT32* audio_in; |
| FLOAT32** audio_out; |
| ia_drc_filter_bank_struct* str_drc_filter_bank; |
| ia_drc_instructions_struct* str_drc_instruction_str; |
| WORD32 drc_frame_size = ia_drc_params_struct->drc_frame_size; |
| |
| if (drc_instructions_index >= 0) { |
| str_drc_instruction_str = |
| &(pstr_drc_instruction_arr[drc_instructions_index]); |
| } else { |
| return -1; |
| } |
| |
| e = 0; |
| |
| for (c = 0; c < str_drc_instruction_str->audio_num_chan; c++) |
| |
| { |
| str_drc_filter_bank = NULL; |
| |
| audio_in = audio_io_buf[c]; |
| |
| audio_out = &(audio_band_buffer->non_interleaved_audio[e]); |
| if ((passThru == 0) && (drc_instructions_index >= 0)) { |
| if (str_drc_instruction_str->drc_set_id < 0) { |
| num_bands = 1; |
| } else { |
| g = str_drc_instruction_str->channel_group_of_ch[c]; |
| if (g == -1) { |
| num_bands = 1; |
| // if (ia_filter_banks_struct->str_drc_filter_bank != NULL) |
| //{ |
| str_drc_filter_bank = |
| &(ia_filter_banks_struct->str_drc_filter_bank |
| [str_drc_instruction_str->num_drc_ch_groups]); |
| //} |
| } else { |
| num_bands = str_drc_instruction_str->band_count_of_ch_group[g]; |
| // if (ia_filter_banks_struct->str_drc_filter_bank != NULL) |
| //{ |
| str_drc_filter_bank = |
| &(ia_filter_banks_struct->str_drc_filter_bank[g]); |
| //} |
| } |
| // if (ia_filter_banks_struct->str_drc_filter_bank != NULL) |
| //{ |
| // if (&str_drc_filter_bank->str_all_pass_cascade != NULL) |
| //{ |
| impd_all_pass_cascade_process( |
| &str_drc_filter_bank->str_all_pass_cascade, c, drc_frame_size, |
| audio_in); |
| //} |
| //} |
| } |
| } else { |
| num_bands = 1; |
| } |
| switch (num_bands) { |
| case 1: |
| for (i = 0; i < drc_frame_size; i++) { |
| audio_out[0][i] = audio_in[i]; |
| } |
| e++; |
| break; |
| case 2: |
| impd_two_band_filter_process(&str_drc_filter_bank->str_two_band_bank, c, |
| drc_frame_size, audio_in, audio_out); |
| e += 2; |
| break; |
| case 3: |
| impd_three_band_filter_process( |
| &str_drc_filter_bank->str_three_band_bank, c, drc_frame_size, |
| audio_in, audio_out); |
| e += 3; |
| break; |
| case 4: |
| impd_four_band_filter_process(&str_drc_filter_bank->str_four_band_bank, |
| c, drc_frame_size, audio_in, audio_out); |
| e += 4; |
| break; |
| default: |
| return (PARAM_ERROR); |
| break; |
| } |
| } |
| |
| return (0); |
| } |
| |
| WORD32 |
| impd_store_audio_io_buffer_time(FLOAT32* audio_in_out_buf[], |
| ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i, j; |
| |
| if (audio_io_buf_internal->audio_delay_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| for (j = 0; j < audio_io_buf_internal->frame_size; j++) { |
| audio_io_buf_internal->audio_io_buffer_delayed |
| [i][audio_io_buf_internal->audio_delay_samples + j] = |
| audio_in_out_buf[i][j]; |
| } |
| } |
| } else { |
| audio_io_buf_internal->audio_io_buffer_delayed = audio_in_out_buf; |
| audio_io_buf_internal->audio_in_out_buf = audio_in_out_buf; |
| } |
| |
| return 0; |
| } |
| |
| WORD32 |
| impd_store_audio_io_buffer_freq(FLOAT32* audio_real_buff[], |
| FLOAT32* audio_imag_buff[], |
| ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i, j; |
| |
| if (audio_io_buf_internal->audio_delay_sub_band_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| for (j = 0; j < audio_io_buf_internal->audio_sub_band_frame_size * |
| audio_io_buf_internal->audio_sub_band_count; |
| j++) { |
| audio_io_buf_internal->audio_buffer_delayed_real |
| [i][audio_io_buf_internal->audio_delay_sub_band_samples * |
| audio_io_buf_internal->audio_sub_band_count + |
| j] = audio_real_buff[i][j]; |
| audio_io_buf_internal->audio_buffer_delayed_imag |
| [i][audio_io_buf_internal->audio_delay_sub_band_samples * |
| audio_io_buf_internal->audio_sub_band_count + |
| j] = audio_imag_buff[i][j]; |
| } |
| } |
| } else { |
| audio_io_buf_internal->audio_buffer_delayed_real = audio_real_buff; |
| audio_io_buf_internal->audio_buffer_delayed_imag = audio_imag_buff; |
| audio_io_buf_internal->audio_real_buff = audio_real_buff; |
| audio_io_buf_internal->audio_imag_buff = audio_imag_buff; |
| } |
| |
| return 0; |
| } |
| |
| WORD32 |
| impd_retrieve_audio_io_buffer_time(FLOAT32* audio_in_out_buf[], |
| ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i, j; |
| |
| if (audio_io_buf_internal->audio_delay_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| for (j = 0; j < audio_io_buf_internal->frame_size; j++) { |
| audio_in_out_buf[i][j] = |
| audio_io_buf_internal->audio_io_buffer_delayed[i][j]; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| WORD32 |
| impd_retrieve_audio_buffer_freq(FLOAT32* audio_real_buff[], |
| FLOAT32* audio_imag_buff[], |
| ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i, j; |
| |
| if (audio_io_buf_internal->audio_delay_sub_band_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| for (j = 0; j < audio_io_buf_internal->audio_sub_band_frame_size * |
| audio_io_buf_internal->audio_sub_band_count; |
| j++) { |
| audio_real_buff[i][j] = |
| audio_io_buf_internal->audio_buffer_delayed_real |
| [i][audio_io_buf_internal->audio_sub_band_count + j]; |
| audio_imag_buff[i][j] = |
| audio_io_buf_internal->audio_buffer_delayed_imag |
| [i][audio_io_buf_internal->audio_sub_band_count + j]; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| WORD32 |
| impd_advance_audio_io_buffer_time(ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i; |
| if (audio_io_buf_internal->audio_delay_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| memmove( |
| audio_io_buf_internal->audio_io_buffer_delayed[i], |
| &audio_io_buf_internal |
| ->audio_io_buffer_delayed[i][audio_io_buf_internal->frame_size], |
| sizeof(FLOAT32) * audio_io_buf_internal->audio_delay_samples); |
| } |
| } |
| |
| return 0; |
| } |
| |
| WORD32 |
| impd_advance_audio_buff_freq(ia_audio_in_out_buf* audio_io_buf_internal) { |
| WORD32 i; |
| if (audio_io_buf_internal->audio_delay_sub_band_samples) { |
| for (i = 0; i < audio_io_buf_internal->audio_num_chan; i++) { |
| memmove(audio_io_buf_internal->audio_buffer_delayed_real[i], |
| &audio_io_buf_internal->audio_buffer_delayed_real |
| [i][audio_io_buf_internal->audio_sub_band_frame_size * |
| audio_io_buf_internal->audio_sub_band_count], |
| sizeof(FLOAT32) * |
| audio_io_buf_internal->audio_delay_sub_band_samples * |
| audio_io_buf_internal->audio_sub_band_count); |
| memmove(audio_io_buf_internal->audio_buffer_delayed_imag[i], |
| &audio_io_buf_internal->audio_buffer_delayed_imag |
| [i][audio_io_buf_internal->audio_sub_band_frame_size * |
| audio_io_buf_internal->audio_sub_band_count], |
| sizeof(FLOAT32) * |
| audio_io_buf_internal->audio_delay_sub_band_samples * |
| audio_io_buf_internal->audio_sub_band_count); |
| } |
| } |
| return 0; |
| } |
