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111 lines
3.0 KiB
C++
111 lines
3.0 KiB
C++
1 year ago
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/*
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* Project 25 IMBE Encoder/Decoder Fixed-Point implementation
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* Developed by Pavel Yazev E-mail: pyazev@gmail.com
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* Version 1.0 (c) Copyright 2009
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* The software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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#include "typedef.h"
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#include "globals.h"
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#include "imbe.h"
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#include "basic_op.h"
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#include "ch_encode.h"
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#include "aux_sub.h"
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void encode_frame_vector(IMBE_PARAM *imbe_param, Word16 *frame_vector)
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{
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Word16 bit_stream[EN_BIT_STREAM_LEN], index0, bit_thr, bit_mask, i;
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Word16 vec_num, num_harms, num_bands, tmp;
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Word16 *ba_ptr, *b_ptr;
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num_harms = imbe_param->num_harms;
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num_bands = imbe_param->num_bands;
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v_zap(frame_vector, 8);
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// Unpack bit allocation table's item
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get_bit_allocation(num_harms, imbe_param->bit_alloc);
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// Priority Scanning
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index0 = 0;
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ba_ptr = imbe_param->bit_alloc;
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bit_thr = (num_harms == 0xb)?9:ba_ptr[0];
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bit_mask = shl(1, bit_thr - 1);
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while(index0 < EN_BIT_STREAM_LEN - (num_bands - 3))
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{
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b_ptr = &imbe_param->b_vec[3];
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for(i = 0; i < num_harms - 1; i++)
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if(bit_thr && bit_thr <= ba_ptr[i])
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bit_stream[index0++] = (b_ptr[i] & bit_mask)?1:0;
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bit_thr--;
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bit_mask = shr(bit_mask, 1);
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}
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frame_vector[0] = shl(imbe_param->b_vec[0] & 0xFC, 4) | (imbe_param->b_vec[2] & 0x38);
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index0 = 0;
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frame_vector[0] |= (bit_stream[index0++])?4:0;
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frame_vector[0] |= (bit_stream[index0++])?2:0;
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frame_vector[0] |= (bit_stream[index0++])?1:0;
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for(vec_num = 1; vec_num <= 3; vec_num++)
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{
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tmp = 0;
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for(i = 0; i < 12; i++)
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{
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tmp <<= 1;
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tmp |= bit_stream[index0++];
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}
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frame_vector[vec_num] = tmp;
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}
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index0 -= num_bands + 2;
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bit_mask = shl(1, num_bands - 1);
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for(i = 0; i < num_bands; i++)
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{
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bit_stream[index0++] = (imbe_param->b_vec[1] & bit_mask)?1:0;
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bit_mask >>= 1;
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}
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bit_stream[index0++] = (imbe_param->b_vec[2] & 0x04)?1:0;
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bit_stream[index0++] = (imbe_param->b_vec[2] & 0x02)?1:0;
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index0 -= num_bands + 2;
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for(vec_num = 4; vec_num <= 6; vec_num++)
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{
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tmp = 0;
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for(i = 0; i < 11; i++)
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{
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tmp <<= 1;
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tmp |= bit_stream[index0++];
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}
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frame_vector[vec_num] = tmp;
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}
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frame_vector[7] = shl(imbe_param->b_vec[0] & 0x03, 1) | shl(imbe_param->b_vec[2] & 0x01, 3);
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frame_vector[7] |= (bit_stream[index0++])?0x40:0;
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frame_vector[7] |= (bit_stream[index0++])?0x20:0;
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frame_vector[7] |= (bit_stream[index0++])?0x10:0;
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frame_vector[7] |= (imbe_param->b_vec[num_harms + 2])?0x01:0;
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}
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