| /**************************************************************************************** |
| ** |
| ** ITU-T G.722.1 (2005-05) - Fixed point implementation for main body and Annex C |
| ** > Software Release 2.1 (2008-06) |
| ** (Simple repackaging; no change from 2005-05 Release 2.0 code) |
| ** |
| ** © 2004 Polycom, Inc. |
| ** |
| ** All rights reserved. |
| ** |
| ****************************************************************************************/ |
| |
| /**************************************************************************************** |
| Filename: common.c |
| |
| Purpose: Contains the functions used for both G.722.1 Annex C encoder and decoder |
| |
| Design Notes: |
| |
| ****************************************************************************************/ |
| /**************************************************************************************** |
| Include files |
| ****************************************************************************************/ |
| #include "defs.h" |
| #include "huff_def.h" |
| #include "huff_tab.h" |
| #include "tables.h" |
| #include "count.h" |
| |
| /**************************************************************************************** |
| Function: categorize |
| |
| Syntax: void categorize(Word16 number_of_available_bits, |
| Word16 number_of_regions, |
| Word16 num_categorization_control_possibilities, |
| Word16 rms_index, |
| Word16 power_categories, |
| Word16 category_balances) |
| |
| inputs: number_of_regions |
| num_categorization_control_possibilities |
| number_of_available_bits |
| rms_index[MAX_NUMBER_OF_REGIONS] |
| |
| outputs: power_categories[MAX_NUMBER_OF_REGIONS] |
| category_balances[MAX_NUM_CATEGORIZATION_CONTROL_POSSIBILITIES-1] |
| |
| Description: Computes a series of categorizations |
| |
| WMOPS: 7kHz | 24kbit | 32kbit |
| -------|--------------|---------------- |
| AVG | 0.14 | 0.14 |
| -------|--------------|---------------- |
| MAX | 0.15 | 0.15 |
| -------|--------------|---------------- |
| |
| 14kHz | 24kbit | 32kbit | 48kbit |
| -------|--------------|----------------|---------------- |
| AVG | 0.42 | 0.45 | 0.48 |
| -------|--------------|----------------|---------------- |
| MAX | 0.47 | 0.52 | 0.52 |
| -------|--------------|----------------|---------------- |
| |
| ****************************************************************************************/ |
| void categorize(Word16 number_of_available_bits, |
| Word16 number_of_regions, |
| Word16 num_categorization_control_possibilities, |
| Word16 *rms_index, |
| Word16 *power_categories, |
| Word16 *category_balances) |
| { |
| |
| Word16 offset; |
| Word16 temp; |
| Word16 frame_size; |
| |
| /* At higher bit rates, there is an increase for most categories in average bit |
| consumption per region. We compensate for this by pretending we have fewer |
| available bits. */ |
| test(); |
| if (number_of_regions == NUMBER_OF_REGIONS) |
| { |
| frame_size = DCT_LENGTH; |
| } |
| else |
| { |
| frame_size = MAX_DCT_LENGTH; |
| } |
| |
| temp = sub(number_of_available_bits,frame_size); |
| |
| test(); |
| if (temp > 0) |
| { |
| number_of_available_bits = sub(number_of_available_bits,frame_size); |
| number_of_available_bits = extract_l(L_mult0(number_of_available_bits,5)); |
| number_of_available_bits = shr_nocheck(number_of_available_bits,3); |
| number_of_available_bits = add(number_of_available_bits,frame_size); |
| } |
| |
| /* calculate the offset using the original category assignments */ |
| offset = calc_offset(rms_index,number_of_regions,number_of_available_bits); |
| |
| |
| |
| /* compute the power categories based on the uniform offset */ |
| compute_raw_pow_categories(power_categories,rms_index,number_of_regions,offset); |
| |
| |
| /* adjust the category assignments */ |
| /* compute the new power categories and category balances */ |
| comp_powercat_and_catbalance(power_categories,category_balances,rms_index,number_of_available_bits,number_of_regions,num_categorization_control_possibilities,offset); |
| |
| } |
| |
| /*************************************************************************** |
| Function: comp_powercat_and_catbalance |
| |
| Syntax: void comp_powercat_and_catbalance(Word16 *power_categories, |
| Word16 *category_balances, |
| Word16 *rms_index, |
| Word16 number_of_available_bits, |
| Word16 number_of_regions, |
| Word16 num_categorization_control_possibilities, |
| Word16 offset) |
| |
| |
| inputs: *rms_index |
| number_of_available_bits |
| number_of_regions |
| num_categorization_control_possibilities |
| offset |
| |
| outputs: *power_categories |
| *category_balances |
| |
| |
| Description: Computes the power_categories and the category balances |
| |
| WMOPS: 7kHz | 24kbit | 32kbit |
| -------|--------------|---------------- |
| AVG | 0.10 | 0.10 |
| -------|--------------|---------------- |
| MAX | 0.11 | 0.11 |
| -------|--------------|---------------- |
| |
| 14kHz | 24kbit | 32kbit | 48kbit |
| -------|--------------|----------------|---------------- |
| AVG | 0.32 | 0.35 | 0.38 |
| -------|--------------|----------------|---------------- |
| MAX | 0.38 | 0.42 | 0.43 |
| -------|--------------|----------------|---------------- |
| |
| ***************************************************************************/ |
| void comp_powercat_and_catbalance(Word16 *power_categories, |
| Word16 *category_balances, |
| Word16 *rms_index, |
| Word16 number_of_available_bits, |
| Word16 number_of_regions, |
| Word16 num_categorization_control_possibilities, |
| Word16 offset) |
| { |
| |
| Word16 expected_number_of_code_bits; |
| Word16 region; |
| Word16 max_region; |
| Word16 j; |
| Word16 max_rate_categories[MAX_NUMBER_OF_REGIONS]; |
| Word16 min_rate_categories[MAX_NUMBER_OF_REGIONS]; |
| Word16 temp_category_balances[2*MAX_NUM_CATEGORIZATION_CONTROL_POSSIBILITIES]; |
| Word16 raw_max, raw_min; |
| Word16 raw_max_index=0, raw_min_index=0; |
| Word16 max_rate_pointer, min_rate_pointer; |
| Word16 max, min; |
| Word16 itemp0; |
| Word16 itemp1; |
| Word16 min_plus_max; |
| Word16 two_x_number_of_available_bits; |
| |
| Word16 temp; |
| |
| expected_number_of_code_bits = 0; |
| move16(); |
| |
| for (region=0; region<number_of_regions; region++) |
| expected_number_of_code_bits = add(expected_number_of_code_bits,expected_bits_table[power_categories[region]]); |
| |
| |
| for (region=0; region<number_of_regions; region++) |
| { |
| max_rate_categories[region] = power_categories[region]; |
| move16(); |
| |
| min_rate_categories[region] = power_categories[region]; |
| move16(); |
| } |
| |
| max = expected_number_of_code_bits; |
| move16(); |
| min = expected_number_of_code_bits; |
| move16(); |
| max_rate_pointer = num_categorization_control_possibilities; |
| move16(); |
| min_rate_pointer = num_categorization_control_possibilities; |
| move16(); |
| |
| for (j=0; j<num_categorization_control_possibilities-1; j++) |
| { |
| min_plus_max = add(max,min); |
| two_x_number_of_available_bits = shl_nocheck(number_of_available_bits,1); |
| |
| temp = sub(min_plus_max,two_x_number_of_available_bits); |
| test(); |
| if (temp <= 0) |
| { |
| raw_min = 99; |
| move16(); |
| /* Search from lowest freq regions to highest for best */ |
| /* region to reassign to a higher bit rate category. */ |
| for (region=0; region<number_of_regions; region++) |
| { |
| test(); |
| if (max_rate_categories[region] > 0) |
| { |
| itemp0 = shl_nocheck(max_rate_categories[region],1); |
| itemp1 = sub(offset,rms_index[region]); |
| itemp0 = sub(itemp1,itemp0); |
| |
| temp = sub(itemp0,raw_min); |
| test(); |
| if (temp < 0) |
| { |
| raw_min = itemp0; |
| raw_min_index = region; |
| } |
| } |
| } |
| max_rate_pointer = sub(max_rate_pointer,1); |
| temp_category_balances[max_rate_pointer] = raw_min_index; |
| move16(); |
| |
| max = sub(max,expected_bits_table[max_rate_categories[raw_min_index]]); |
| max_rate_categories[raw_min_index] = sub(max_rate_categories[raw_min_index],1); |
| move16(); |
| |
| max = add(max,expected_bits_table[max_rate_categories[raw_min_index]]); |
| } |
| else |
| { |
| raw_max = -99; |
| move16(); |
| /* Search from highest freq regions to lowest for best region to reassign to |
| a lower bit rate category. */ |
| max_region = sub(number_of_regions,1); |
| for (region= max_region; region >= 0; region--) |
| { |
| temp = sub(min_rate_categories[region],(NUM_CATEGORIES-1)); |
| test(); |
| if (temp < 0) |
| { |
| itemp0 = shl_nocheck(min_rate_categories[region],1); |
| itemp1 = sub(offset,rms_index[region]); |
| itemp0 = sub(itemp1,itemp0); |
| |
| temp = sub(itemp0,raw_max); |
| test(); |
| if (temp > 0) |
| { |
| raw_max = itemp0; |
| move16(); |
| raw_max_index = region; |
| move16(); |
| } |
| } |
| } |
| temp_category_balances[min_rate_pointer] = raw_max_index; |
| move16(); |
| |
| min_rate_pointer = add(min_rate_pointer,1); |
| min = sub(min,expected_bits_table[min_rate_categories[raw_max_index]]); |
| |
| min_rate_categories[raw_max_index] = add(min_rate_categories[raw_max_index],1); |
| move16(); |
| |
| min = add(min,expected_bits_table[min_rate_categories[raw_max_index]]); |
| } |
| } |
| |
| for (region=0; region<number_of_regions; region++) |
| { |
| power_categories[region] = max_rate_categories[region]; |
| move16(); |
| } |
| |
| for (j=0; j<num_categorization_control_possibilities-1; j++) |
| { |
| category_balances[j] = temp_category_balances[max_rate_pointer++]; |
| move16(); |
| } |
| |
| } |
| /*************************************************************************** |
| Function: calc_offset |
| |
| Syntax: offset=calc_offset(Word16 *rms_index,Word16 number_of_regions,Word16 available_bits) |
| |
| input: Word16 *rms_index |
| Word16 number_of_regions |
| Word16 available_bits |
| |
| output: Word16 offset |
| |
| Description: Calculates the the category offset. This is the shift required |
| To get the most out of the number of available bits. A binary |
| type search is used to find the offset. |
| |
| WMOPS: 7kHz | 24kbit | 32kbit |
| -------|--------------|---------------- |
| AVG | 0.04 | 0.04 |
| -------|--------------|---------------- |
| MAX | 0.04 | 0.04 |
| -------|--------------|---------------- |
| |
| 14kHz | 24kbit | 32kbit | 48kbit |
| -------|--------------|----------------|---------------- |
| AVG | 0.08 | 0.08 | 0.08 |
| -------|--------------|----------------|---------------- |
| MAX | 0.09 | 0.09 | 0.09 |
| -------|--------------|----------------|---------------- |
| |
| ***************************************************************************/ |
| Word16 calc_offset(Word16 *rms_index,Word16 number_of_regions,Word16 available_bits) |
| { |
| |
| Word16 answer; |
| Word16 delta; |
| Word16 test_offset; |
| Word16 region,j; |
| Word16 power_cats[MAX_NUMBER_OF_REGIONS]; |
| Word16 bits; |
| Word16 offset; |
| Word16 temp; |
| |
| /* initialize vars */ |
| answer = -32; |
| move16(); |
| delta = 32; |
| move16(); |
| |
| do |
| { |
| test_offset = add(answer,delta); |
| |
| /* obtain a category for each region */ |
| /* using the test offset */ |
| for (region=0; region<number_of_regions; region++) |
| { |
| j = sub(test_offset,rms_index[region]); |
| j = shr_nocheck(j,1); |
| |
| /* Ensure j is between 0 and NUM_CAT-1 */ |
| test(); |
| if (j < 0) |
| { |
| j = 0; |
| move16(); |
| } |
| temp = sub(j,NUM_CATEGORIES-1); |
| test(); |
| if (temp > 0) |
| { |
| j = sub(NUM_CATEGORIES,1); |
| move16(); |
| } |
| power_cats[region] = j; |
| move16(); |
| } |
| bits = 0; |
| move16(); |
| |
| /* compute the number of bits that will be used given the cat assignments */ |
| for (region=0; region<number_of_regions; region++) |
| bits = add(bits,expected_bits_table[power_cats[region]]); |
| |
| /* if (bits > available_bits - 32) then divide the offset region for the bin search */ |
| offset = sub(available_bits,32); |
| temp = sub(bits,offset); |
| test(); |
| if (temp >= 0) |
| { |
| answer = test_offset; |
| move16(); |
| } |
| delta = shr_nocheck(delta,1); |
| test(); /* for the while loop */ |
| } while (delta > 0); |
| |
| return(answer); |
| } |
| /*************************************************************************** |
| Function: compute_raw_pow_categories |
| |
| Syntax: void compute_raw_pow_categories(Word16 *power_categories, |
| Word16 *rms_index, |
| Word16 number_of_regions, |
| Word16 offset) |
| inputs: *rms_index |
| number_of_regions |
| offset |
| |
| outputs: *power_categories |
| |
| |
| |
| Description: This function computes the power categories given the offset |
| This is kind of redundant since they were already computed |
| in calc_offset to determine the offset. |
| |
| WMOPS: | 24kbit | 32kbit |
| -------|--------------|---------------- |
| AVG | 0.01 | 0.01 |
| -------|--------------|---------------- |
| MAX | 0.01 | 0.01 |
| -------|--------------|---------------- |
| |
| 14kHz | 24kbit | 32kbit | 48kbit |
| -------|--------------|----------------|---------------- |
| AVG | 0.01 | 0.01 | 0.01 |
| -------|--------------|----------------|---------------- |
| MAX | 0.01 | 0.01 | 0.01 |
| -------|--------------|----------------|---------------- |
| |
| ***************************************************************************/ |
| void compute_raw_pow_categories(Word16 *power_categories,Word16 *rms_index,Word16 number_of_regions,Word16 offset) |
| { |
| Word16 region; |
| Word16 j; |
| Word16 temp; |
| |
| for (region=0; region<number_of_regions; region++) |
| { |
| j = sub(offset,rms_index[region]); |
| j = shr_nocheck(j,1); |
| |
| /* make sure j is between 0 and NUM_CAT-1 */ |
| test(); |
| if (j < 0) |
| { |
| j = 0; |
| move16(); |
| } |
| temp = sub(j,(NUM_CATEGORIES-1)); |
| test(); |
| if (temp > 0) |
| j = sub(NUM_CATEGORIES,1); |
| |
| power_categories[region] = j; |
| move16(); |
| } |
| } |
| |