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/*
* ATRAC3+ compatible decoder
*
* Copyright (c) 2010-2013 Maxim Poliakovski
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* DSP functions for ATRAC3+ decoder.
*/
/**
* This file was borrowed from FFmpeg to test analysis PQF implementation
*/
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "atrac3plusdsp.h"
/* lookup table for fast modulo 23 op required for cyclic buffers of the IPQF */
static const int mod23_lut[26] = {
23, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 0
};
/* First half of the 384-tap IPQF filtering coefficients. */
static const float ipqf_coeffs1[ATRAC3P_PQF_FIR_LEN][16] = {
{ -5.8336207e-7, -8.0604229e-7, -4.2005411e-7, -4.4400572e-8,
3.226247e-8, 3.530856e-8, 1.2660377e-8, 0.000010516783,
-0.000011838618, 6.005389e-7, 0.0000014333754, 0.0000023108685,
0.0000032569742, 0.0000046192422, 0.0000063894258, 0.0000070302972 },
{ -0.0000091622824, -0.000010502935, -0.0000079212787, -0.0000041712024,
-0.0000026336629, -0.0000015432918, -5.7168614e-7, 0.0000018111954,
0.000023530851, 0.00002780562, 0.000032302323, 0.000036968919,
0.000041575615, 0.000045337845, 0.000046043948, 0.000048585582 },
{ -0.000064464548, -0.000068306952, -0.000073081472, -0.00007612785,
-0.000074850752, -0.000070208509, -0.000062285151, -0.000058270442,
-0.000056296329, -0.000049888811, -0.000035615325, -0.000018532943,
0.0000016657353, 0.00002610587, 0.000053397067, 0.00008079566 },
{ -0.00054488552, -0.00052537228, -0.00049731287, -0.00045778,
-0.00040612387, -0.00034301577, -0.00026866337, -0.00018248901,
-0.000084307925, 0.000025081157, 0.00014135583, 0.00026649953,
0.00039945057, 0.00053928449, 0.00068422867, 0.00083093712 },
{ -0.0014771431, -0.001283227, -0.0010566821, -0.00079780724,
-0.00050782406, -0.00018855913, 0.00015771533, 0.00052769453,
0.00091862219, 0.001326357, 0.0017469483, 0.0021754825,
0.0026067684, 0.0030352892, 0.0034549395, 0.0038591374 },
{ -0.0022995141, -0.001443546, -0.00049266568, 0.00055068987,
0.001682895, 0.0028992873, 0.0041943151, 0.0055614738,
0.0069935122, 0.0084823566, 0.010018963, 0.011593862,
0.013196872, 0.014817309, 0.016444042, 0.018065533 },
{ -0.034426283, -0.034281436, -0.033992987, -0.033563249,
-0.032995768, -0.032295227, -0.031467363, -0.030518902,
-0.02945766, -0.028291954, -0.027031265, -0.025685543,
-0.024265358, -0.022781773, -0.021246184, -0.019670162 },
{ -0.0030586775, -0.0037203205, -0.0042847847, -0.0047529764,
-0.0051268316, -0.0054091476, -0.0056034233, -0.005714261,
-0.0057445862, -0.0057025906, -0.0055920109, -0.0054194843,
-0.0051914565, -0.0049146507, -0.0045959447, -0.0042418269 },
{ -0.0016376863, -0.0017651899, -0.0018608454, -0.0019252141,
-0.0019593791, -0.0019653172, -0.0019450618, -0.0018990048,
-0.00183808, -0.0017501717, -0.0016481078, -0.0015320742,
-0.0014046903, -0.0012685474, -0.001125814, -0.00097943726 },
{ -0.00055432378, -0.00055472925, -0.00054783461, -0.00053276919,
-0.00051135791, -0.00048466062, -0.00045358928, -0.00042499689,
-0.00036942671, -0.0003392619, -0.00030001783, -0.00025986304,
-0.0002197204, -0.00018116167, -0.00014691355, -0.00011279432 },
{ -0.000064147389, -0.00006174868, -0.000054267788, -0.000047133824,
-0.000042927582, -0.000039477309, -0.000036340745, -0.000029687517,
-0.000049787737, -0.000041577889, -0.000033864744, -0.000026534748,
-0.000019841305, -0.000014789486, -0.000013131184, -0.0000099198869 },
{ -0.0000062990207, -0.0000072701259, -0.000011984052, -0.000017348082,
-0.000019907106, -0.000021348773, -0.000021961965, -0.000012203576,
-0.000010840992, 4.6299544e-7, 5.2588763e-7, 2.7792686e-7,
-2.3649704e-7, -0.0000010897784, -9.171448e-7, -5.22682e-7 }
};
/* Second half of the 384-tap IPQF filtering coefficients. */
static const float ipqf_coeffs2[ATRAC3P_PQF_FIR_LEN][16] = {
{ 5.22682e-7, 9.171448e-7, 0.0000010897784, 2.3649704e-7,
-2.7792686e-7, -5.2588763e-7, -4.6299544e-7, 0.000010840992,
-0.000012203576, -0.000021961965, -0.000021348773, -0.000019907106,
-0.000017348082, -0.000011984052, -0.0000072701259, -0.0000062990207 },
{ 0.0000099198869, 0.000013131184, 0.000014789486, 0.000019841305,
0.000026534748, 0.000033864744, 0.000041577889, 0.000049787737,
-0.000029687517, -0.000036340745, -0.000039477309, -0.000042927582,
-0.000047133824, -0.000054267788, -0.00006174868, -0.000064147389 },
{ 0.00011279432, 0.00014691355, 0.00018116167, 0.0002197204,
0.00025986304, 0.00030001783, 0.0003392619, 0.00036942671,
-0.00042499689, -0.00045358928, -0.00048466062, -0.00051135791,
-0.00053276919, -0.00054783461, -0.00055472925, -0.00055432378 },
{ 0.00097943726, 0.001125814, 0.0012685474, 0.0014046903,
0.0015320742, 0.0016481078, 0.0017501717, 0.00183808,
-0.0018990048, -0.0019450618, -0.0019653172, -0.0019593791,
-0.0019252141, -0.0018608454, -0.0017651899, -0.0016376863 },
{ 0.0042418269, 0.0045959447, 0.0049146507, 0.0051914565,
0.0054194843, 0.0055920109, 0.0057025906, 0.0057445862,
-0.005714261, -0.0056034233, -0.0054091476, -0.0051268316,
-0.0047529764, -0.0042847847, -0.0037203205, -0.0030586775 },
{ 0.019670162, 0.021246184, 0.022781773, 0.024265358,
0.025685543, 0.027031265, 0.028291954, 0.02945766,
-0.030518902, -0.031467363, -0.032295227, -0.032995768,
-0.033563249, -0.033992987, -0.034281436, -0.034426283 },
{ -0.018065533, -0.016444042, -0.014817309, -0.013196872,
-0.011593862, -0.010018963, -0.0084823566, -0.0069935122,
0.0055614738, 0.0041943151, 0.0028992873, 0.001682895,
0.00055068987, -0.00049266568, -0.001443546, -0.0022995141 },
{ -0.0038591374, -0.0034549395, -0.0030352892, -0.0026067684,
-0.0021754825, -0.0017469483, -0.001326357, -0.00091862219,
0.00052769453, 0.00015771533, -0.00018855913, -0.00050782406,
-0.00079780724, -0.0010566821, -0.001283227, -0.0014771431 },
{ -0.00083093712, -0.00068422867, -0.00053928449, -0.00039945057,
-0.00026649953, -0.00014135583, -0.000025081157, 0.000084307925,
-0.00018248901, -0.00026866337, -0.00034301577, -0.00040612387,
-0.00045778, -0.00049731287, -0.00052537228, -0.00054488552 },
{ -0.00008079566, -0.000053397067, -0.00002610587, -0.0000016657353,
0.000018532943, 0.000035615325, 0.000049888811, 0.000056296329,
-0.000058270442, -0.000062285151, -0.000070208509, -0.000074850752,
-0.00007612785, -0.000073081472, -0.000068306952, -0.000064464548 },
{ -0.000048585582, -0.000046043948, -0.000045337845, -0.000041575615,
-0.000036968919, -0.000032302323, -0.00002780562, -0.000023530851,
0.0000018111954, -5.7168614e-7, -0.0000015432918, -0.0000026336629,
-0.0000041712024, -0.0000079212787, -0.000010502935, -0.0000091622824 },
{ -0.0000070302972, -0.0000063894258, -0.0000046192422, -0.0000032569742,
-0.0000023108685, -0.0000014333754, -6.005389e-7, 0.000011838618,
0.000010516783, 1.2660377e-8, 3.530856e-8, 3.226247e-8,
-4.4400572e-8, -4.2005411e-7, -8.0604229e-7, -5.8336207e-7 }
};
// Just for test
static void dct4(float* out, const float* x, int N, float scale) {
for (int k = 0; k < N; k++) {
double sum = 0;
for (int n = 0; n < N; n++) {
sum += x[n] * cos((M_PI/N) * ((double)n + 0.5) * ((double)k + 0.5));
}
out[N - 1 - k] = sum * scale;
}
}
void ff_atrac3p_ipqf(Atrac3pIPQFChannelCtx *hist, const float *in, float *out)
{
int i, s, sb, t, pos_now, pos_next;
float idct_in[ATRAC3P_SUBBANDS];
float idct_out[ATRAC3P_SUBBANDS];
memset(out, 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out));
for (s = 0; s < ATRAC3P_SUBBAND_SAMPLES; s++) {
/* pick up one sample from each subband */
for (sb = 0; sb < ATRAC3P_SUBBANDS; sb++)
idct_in[sb] = in[sb * ATRAC3P_SUBBAND_SAMPLES + s];
dct4(idct_out, idct_in, ATRAC3P_SUBBANDS, 1.0/1024);
/* append the result to the history */
for (i = 0; i < 8; i++) {
hist->buf1[hist->pos][i] = idct_out[i + 8];
hist->buf2[hist->pos][i] = idct_out[7 - i];
}
pos_now = hist->pos;
pos_next = mod23_lut[pos_now + 2]; // pos_next = (pos_now + 1) % 23;
for (t = 0; t < ATRAC3P_PQF_FIR_LEN; t++) {
for (i = 0; i < 8; i++) {
out[s * 16 + i + 0] += hist->buf1[pos_now][i] * ipqf_coeffs1[t][i] +
hist->buf2[pos_next][i] * ipqf_coeffs2[t][i];
out[s * 16 + i + 8] += hist->buf1[pos_now][7 - i] * ipqf_coeffs1[t][i + 8] +
hist->buf2[pos_next][7 - i] * ipqf_coeffs2[t][i + 8];
}
pos_now = mod23_lut[pos_next + 2]; // pos_now = (pos_now + 2) % 23;
pos_next = mod23_lut[pos_now + 2]; // pos_next = (pos_next + 2) % 23;
}
hist->pos = mod23_lut[hist->pos]; // hist->pos = (hist->pos - 1) % 23;
}
}
|
