2 * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/attributes.h"
22 #include "libavutil/samplefmt.h"
25 #define SAMPLE_SIZE 16
27 #include "flacdsp_template.c"
31 #include "flacdsp_template.c"
35 #define SAMPLE_SIZE 32
37 #include "flacdsp_template.c"
41 #include "flacdsp_template.c"
43 static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
44 int pred_order, int qlevel, int len)
48 for (i = pred_order; i < len - 1; i += 2) {
50 int d = decoded[i-pred_order];
52 for (j = pred_order-1; j > 0; j--) {
60 d = decoded[i] += s0 >> qlevel;
62 decoded[i+1] += s1 >> qlevel;
66 for (j = 0; j < pred_order; j++)
67 sum += coeffs[j] * decoded[i-j-1];
68 decoded[i] += sum >> qlevel;
72 static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
73 int pred_order, int qlevel, int len)
77 for (i = pred_order; i < len; i++) {
79 for (j = 0; j < pred_order; j++)
80 sum += (int64_t)coeffs[j] * decoded[i-j-1];
81 decoded[i] += sum >> qlevel;
86 av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt,
90 c->lpc = flac_lpc_32_c;
92 c->lpc = flac_lpc_16_c;
95 case AV_SAMPLE_FMT_S32:
96 c->decorrelate[0] = flac_decorrelate_indep_c_32;
97 c->decorrelate[1] = flac_decorrelate_ls_c_32;
98 c->decorrelate[2] = flac_decorrelate_rs_c_32;
99 c->decorrelate[3] = flac_decorrelate_ms_c_32;
102 case AV_SAMPLE_FMT_S32P:
103 c->decorrelate[0] = flac_decorrelate_indep_c_32p;
104 c->decorrelate[1] = flac_decorrelate_ls_c_32p;
105 c->decorrelate[2] = flac_decorrelate_rs_c_32p;
106 c->decorrelate[3] = flac_decorrelate_ms_c_32p;
109 case AV_SAMPLE_FMT_S16:
110 c->decorrelate[0] = flac_decorrelate_indep_c_16;
111 c->decorrelate[1] = flac_decorrelate_ls_c_16;
112 c->decorrelate[2] = flac_decorrelate_rs_c_16;
113 c->decorrelate[3] = flac_decorrelate_ms_c_16;
116 case AV_SAMPLE_FMT_S16P:
117 c->decorrelate[0] = flac_decorrelate_indep_c_16p;
118 c->decorrelate[1] = flac_decorrelate_ls_c_16p;
119 c->decorrelate[2] = flac_decorrelate_rs_c_16p;
120 c->decorrelate[3] = flac_decorrelate_ms_c_16p;