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199 lines
5.6 KiB
C
199 lines
5.6 KiB
C
/*
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* Siren Encoder/Decoder library
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*
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* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "siren7.h"
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#define PI 3.1415926
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typedef struct
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{
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float cos;
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float msin;
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} dct_table_type;
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static float dct_core_320[100];
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static float dct_core_640[100];
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static dct_table_type dct_table_5[5];
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static dct_table_type dct_table_10[10];
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static dct_table_type dct_table_20[20];
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static dct_table_type dct_table_40[40];
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static dct_table_type dct_table_80[80];
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static dct_table_type dct_table_160[160];
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static dct_table_type dct_table_320[320];
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static dct_table_type dct_table_640[640];
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static dct_table_type *dct_tables[8] = { dct_table_5,
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dct_table_10,
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dct_table_20,
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dct_table_40,
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dct_table_80,
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dct_table_160,
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dct_table_320,
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dct_table_640
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};
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static int dct4_initialized = 0;
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void
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siren_dct4_init (void)
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{
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int i, j = 0;
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double scale_320 = (float) sqrt (2.0 / 320);
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double scale_640 = (float) sqrt (2.0 / 640);
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double angle;
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double scale;
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/* set up dct4 tables */
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for (i = 0; i < 10; i++) {
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angle = (float) ((i + 0.5) * PI);
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for (j = 0; j < 10; j++) {
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dct_core_320[(i * 10) + j] =
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(float) (scale_320 * cos ((j + 0.5) * angle / 10));
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dct_core_640[(i * 10) + j] =
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(float) (scale_640 * cos ((j + 0.5) * angle / 10));
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}
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}
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for (i = 0; i < 8; i++) {
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scale = (float) (PI / ((5 << i) * 4));
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for (j = 0; j < (5 << i); j++) {
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angle = (float) (j + 0.5) * scale;
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dct_tables[i][j].cos = (float) cos (angle);
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dct_tables[i][j].msin = (float) -sin (angle);
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}
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}
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dct4_initialized = 1;
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}
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void
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siren_dct4 (float *Source, float *Destination, int dct_length)
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{
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int log_length = 0;
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float *dct_core = NULL;
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dct_table_type **dct_table_ptr_ptr = NULL;
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dct_table_type *dct_table_ptr = NULL;
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float OutBuffer1[640];
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float OutBuffer2[640];
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float *Out_ptr;
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float *NextOut_ptr;
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float *In_Ptr = NULL;
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float *In_Ptr_low = NULL;
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float *In_Ptr_high = NULL;
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float In_val_low;
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float In_val_high;
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float *Out_ptr_low = NULL;
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float *Out_ptr_high = NULL;
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float mult1, mult2, mult3, mult4, mult5, mult6, mult7, mult8, mult9, mult10;
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int i, j;
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if (dct4_initialized == 0)
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siren_dct4_init ();
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if (dct_length == 640) {
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log_length = 5;
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dct_core = dct_core_640;
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} else {
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log_length = 4;
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dct_core = dct_core_320;
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}
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Out_ptr = OutBuffer1;
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NextOut_ptr = OutBuffer2;
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In_Ptr = Source;
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for (i = 0; i <= log_length; i++) {
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for (j = 0; j < (1 << i); j++) {
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Out_ptr_low = Out_ptr + (j * (dct_length >> i));
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Out_ptr_high = Out_ptr + ((j + 1) * (dct_length >> i));
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do {
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In_val_low = *In_Ptr++;
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In_val_high = *In_Ptr++;
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*Out_ptr_low++ = In_val_low + In_val_high;
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*--Out_ptr_high = In_val_low - In_val_high;
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} while (Out_ptr_low < Out_ptr_high);
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}
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In_Ptr = Out_ptr;
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Out_ptr = NextOut_ptr;
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NextOut_ptr = In_Ptr;
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}
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for (i = 0; i < (2 << log_length); i++) {
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for (j = 0; j < 10; j++) {
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mult1 = In_Ptr[(i * 10)] * dct_core[j * 10];
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mult2 = In_Ptr[(i * 10) + 1] * dct_core[(j * 10) + 1];
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mult3 = In_Ptr[(i * 10) + 2] * dct_core[(j * 10) + 2];
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mult4 = In_Ptr[(i * 10) + 3] * dct_core[(j * 10) + 3];
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mult5 = In_Ptr[(i * 10) + 4] * dct_core[(j * 10) + 4];
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mult6 = In_Ptr[(i * 10) + 5] * dct_core[(j * 10) + 5];
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mult7 = In_Ptr[(i * 10) + 6] * dct_core[(j * 10) + 6];
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mult8 = In_Ptr[(i * 10) + 7] * dct_core[(j * 10) + 7];
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mult9 = In_Ptr[(i * 10) + 8] * dct_core[(j * 10) + 8];
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mult10 = In_Ptr[(i * 10) + 9] * dct_core[(j * 10) + 9];
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Out_ptr[(i * 10) + j] = mult1 + mult2 + mult3 + mult4 +
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mult5 + mult6 + mult7 + mult8 + mult9 + mult10;
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}
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}
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In_Ptr = Out_ptr;
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Out_ptr = NextOut_ptr;
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NextOut_ptr = In_Ptr;
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dct_table_ptr_ptr = dct_tables;
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for (i = log_length; i >= 0; i--) {
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dct_table_ptr_ptr++;
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for (j = 0; j < (1 << i); j++) {
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dct_table_ptr = *dct_table_ptr_ptr;
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if (i == 0)
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Out_ptr_low = Destination + (j * (dct_length >> i));
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else
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Out_ptr_low = Out_ptr + (j * (dct_length >> i));
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Out_ptr_high = Out_ptr_low + (dct_length >> i);
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In_Ptr_low = In_Ptr + (j * (dct_length >> i));
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In_Ptr_high = In_Ptr_low + (dct_length >> (i + 1));
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do {
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*Out_ptr_low++ =
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(*In_Ptr_low * (*dct_table_ptr).cos) -
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(*In_Ptr_high * (*dct_table_ptr).msin);
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*--Out_ptr_high =
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(*In_Ptr_high++ * (*dct_table_ptr).cos) +
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(*In_Ptr_low++ * (*dct_table_ptr).msin);
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dct_table_ptr++;
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*Out_ptr_low++ =
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(*In_Ptr_low * (*dct_table_ptr).cos) +
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(*In_Ptr_high * (*dct_table_ptr).msin);
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*--Out_ptr_high =
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(*In_Ptr_low++ * (*dct_table_ptr).msin) -
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(*In_Ptr_high++ * (*dct_table_ptr).cos);
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dct_table_ptr++;
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} while (Out_ptr_low < Out_ptr_high);
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}
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In_Ptr = Out_ptr;
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Out_ptr = NextOut_ptr;
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NextOut_ptr = In_Ptr;
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}
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}
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