FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/alacdsp.c
Date: 2021-09-23 20:34:37
Exec Total Coverage
Lines: 20 20 100.0%
Branches: 6 6 100.0%

Line Branch Exec Source
1 /*
2 * ALAC (Apple Lossless Audio Codec) decoder
3 * Copyright (c) 2005 David Hammerton
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 #include "libavutil/attributes.h"
23 #include "alacdsp.h"
24 #include "config.h"
25
26 602 static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
27 int decorr_shift, int decorr_left_weight)
28 {
29 int i;
30
31
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2444043 for (i = 0; i < nb_samples; i++) {
32 int32_t a, b;
33
34 2443441 a = buffer[0][i];
35 2443441 b = buffer[1][i];
36
37 2443441 a -= (b * decorr_left_weight) >> decorr_shift;
38 2443441 b += a;
39
40 2443441 buffer[0][i] = b;
41 2443441 buffer[1][i] = a;
42 }
43 602 }
44
45 1416 static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
46 int extra_bits, int channels, int nb_samples)
47 {
48 int i, ch;
49
50
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4245 for (ch = 0; ch < channels; ch++)
51
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11548357 for (i = 0; i < nb_samples; i++)
52 11545528 buffer[ch][i] = ((unsigned)buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
53 1416 }
54
55 51 av_cold void ff_alacdsp_init(ALACDSPContext *c)
56 {
57 51 c->decorrelate_stereo = decorrelate_stereo;
58 51 c->append_extra_bits[0] =
59 51 c->append_extra_bits[1] = append_extra_bits;
60
61 if (ARCH_X86)
62 51 ff_alacdsp_init_x86(c);
63 51 }
64