Clarify that we require GNU make 3.81+.
[libav.git] / libavcodec / qcelpdec.c
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1/*
2 * QCELP decoder
3 * Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21/**
22 * @file qcelpdec.c
23 * QCELP decoder
24 * @author Reynaldo H. Verdejo Pinochet
25 */
26
27#include <stddef.h>
28
29#include "avcodec.h"
30#include "bitstream.h"
31
32#include "qcelp.h"
33#include "qcelpdata.h"
34
35#include "celp_math.h"
36#include "celp_filters.h"
37
38#undef NDEBUG
39#include <assert.h>
40
41/**
42 * Apply filter in pitch-subframe steps.
43 *
44 * @param memory buffer for the previous state of the filter
45 * - must be able to contain 303 elements
46 * - the 143 first elements are from the previous state
47 * - the next 160 are for output
48 * @param v_in input filter vector
49 * @param gain per-subframe gain array, each element is between 0.0 and 2.0
50 * @param lag per-subframe lag array, each element is
51 * - between 16 and 143 if its corresponding pfrac is 0,
52 * - between 16 and 139 otherwise
53 * @param pfrac per-subframe boolean array, 1 if the lag is fractional, 0 otherwise
54 *
55 * @return filter output vector
56 */
57static const float *do_pitchfilter(float memory[303],
58 const float v_in[160],
59 const float gain[4],
60 const uint8_t *lag,
61 const uint8_t pfrac[4]) {
62 int i, j;
63 float *v_lag, *v_out;
64 const float *v_len;
65
66 v_out = memory + 143; // Output vector starts at memory[143].
67
68 for (i = 0; i < 4; i++)
69 if (gain[i]) {
70 v_lag = memory + 143 + 40 * i - lag[i];
71 for (v_len = v_in + 40; v_in < v_len; v_in++) {
72 if (pfrac[i]) { // If it is a fractional lag...
73 for (j = 0, *v_out = 0.; j < 4; j++)
74 *v_out += qcelp_hammsinc_table[j] * (v_lag[j-4] + v_lag[3-j]);
75 } else
76 *v_out = *v_lag;
77
78 *v_out = *v_in + gain[i] * *v_out;
79
80 v_lag++;
81 v_out++;
82 }
83 } else {
84 memcpy(v_out, v_in, 40 * sizeof(float));
85 v_in += 40;
86 v_out += 40;
87 }
88
89 memmove(memory, memory + 160, 143 * sizeof(float));
90 return memory + 143;
91}
92
93static void warn_insufficient_frame_quality(AVCodecContext *avctx,
94 const char *message) {
95 av_log(avctx, AV_LOG_WARNING, "Frame #%d, IFQ: %s\n", avctx->frame_number, message);
96}