FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
g722dsp.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Peter Meerwald <pmeerw@pmeerw.net>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "g722dsp.h"
22 #include "mathops.h"
23 
24 /*
25  * quadrature mirror filter (QMF) coefficients (ITU-T G.722 Table 11) inlined
26  * in code below: 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11
27  */
28 
29 static void g722_apply_qmf(const int16_t *prev_samples, int xout[2])
30 {
31  xout[1] = MUL16(*prev_samples++, 3);
32  xout[0] = MUL16(*prev_samples++, -11);
33 
34  MAC16(xout[1], *prev_samples++, -11);
35  MAC16(xout[0], *prev_samples++, 53);
36 
37  MAC16(xout[1], *prev_samples++, 12);
38  MAC16(xout[0], *prev_samples++, -156);
39 
40  MAC16(xout[1], *prev_samples++, 32);
41  MAC16(xout[0], *prev_samples++, 362);
42 
43  MAC16(xout[1], *prev_samples++, -210);
44  MAC16(xout[0], *prev_samples++, -805);
45 
46  MAC16(xout[1], *prev_samples++, 951);
47  MAC16(xout[0], *prev_samples++, 3876);
48 
49  MAC16(xout[1], *prev_samples++, 3876);
50  MAC16(xout[0], *prev_samples++, 951);
51 
52  MAC16(xout[1], *prev_samples++, -805);
53  MAC16(xout[0], *prev_samples++, -210);
54 
55  MAC16(xout[1], *prev_samples++, 362);
56  MAC16(xout[0], *prev_samples++, 32);
57 
58  MAC16(xout[1], *prev_samples++, -156);
59  MAC16(xout[0], *prev_samples++, 12);
60 
61  MAC16(xout[1], *prev_samples++, 53);
62  MAC16(xout[0], *prev_samples++, -11);
63 
64  MAC16(xout[1], *prev_samples++, -11);
65  MAC16(xout[0], *prev_samples++, 3);
66 }
67 
69 {
71 
72  if (ARCH_ARM)
74  if (ARCH_X86)
76 }
av_cold void ff_g722dsp_init_arm(G722DSPContext *dsp)
void(* apply_qmf)(const int16_t *prev_samples, int xout[2])
Definition: g722dsp.h:27
#define MUL16(a, b)
Definition: fft-test.c:50
#define av_cold
Definition: attributes.h:74
av_cold void ff_g722dsp_init(G722DSPContext *c)
Definition: g722dsp.c:68
#define MAC16(rt, ra, rb)
Definition: mathops.h:82
void ff_g722dsp_init_x86(G722DSPContext *c)
Definition: g722dsp_init.c:29
static double c[64]
static void g722_apply_qmf(const int16_t *prev_samples, int xout[2])
Definition: g722dsp.c:29