flvdec: Treat all nellymoser versions as the same codec
[libav.git] / libavcodec / flacdsp.c
1 /*
2 * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/attributes.h"
22 #include "libavutil/samplefmt.h"
23 #include "flacdsp.h"
24
25 #define SAMPLE_SIZE 16
26 #include "flacdsp_template.c"
27
28 #undef SAMPLE_SIZE
29 #define SAMPLE_SIZE 32
30 #include "flacdsp_template.c"
31
32 static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
33 int pred_order, int qlevel, int len)
34 {
35 int i, j;
36
37 for (i = pred_order; i < len - 1; i += 2) {
38 int c;
39 int d = decoded[i-pred_order];
40 int s0 = 0, s1 = 0;
41 for (j = pred_order-1; j > 0; j--) {
42 c = coeffs[j];
43 s0 += c*d;
44 d = decoded[i-j];
45 s1 += c*d;
46 }
47 c = coeffs[0];
48 s0 += c*d;
49 d = decoded[i] += s0 >> qlevel;
50 s1 += c*d;
51 decoded[i+1] += s1 >> qlevel;
52 }
53 if (i < len) {
54 int sum = 0;
55 for (j = 0; j < pred_order; j++)
56 sum += coeffs[j] * decoded[i-j-1];
57 decoded[i] += sum >> qlevel;
58 }
59 }
60
61 static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
62 int pred_order, int qlevel, int len)
63 {
64 int i, j;
65
66 for (i = pred_order; i < len; i++) {
67 int64_t sum = 0;
68 for (j = 0; j < pred_order; j++)
69 sum += (int64_t)coeffs[j] * decoded[i-j-1];
70 decoded[i] += sum >> qlevel;
71 }
72
73 }
74
75 av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt)
76 {
77 switch (fmt) {
78 case AV_SAMPLE_FMT_S32:
79 c->decorrelate[0] = flac_decorrelate_indep_c_32;
80 c->decorrelate[1] = flac_decorrelate_ls_c_32;
81 c->decorrelate[2] = flac_decorrelate_rs_c_32;
82 c->decorrelate[3] = flac_decorrelate_ms_c_32;
83 c->lpc = flac_lpc_32_c;
84 break;
85
86 case AV_SAMPLE_FMT_S16:
87 c->decorrelate[0] = flac_decorrelate_indep_c_16;
88 c->decorrelate[1] = flac_decorrelate_ls_c_16;
89 c->decorrelate[2] = flac_decorrelate_rs_c_16;
90 c->decorrelate[3] = flac_decorrelate_ms_c_16;
91 c->lpc = flac_lpc_16_c;
92 break;
93 }
94 }