| 1 | /* |
| 2 | * Copyright (c) 2012 Mans Rullgard <mans@mansr.com> |
| 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 "libavutil/attributes.h" |
| 22 | #include "libavutil/samplefmt.h" |
| 23 | #include "flacdsp.h" |
| 24 | #include "config.h" |
| 25 | |
| 26 | #define SAMPLE_SIZE 16 |
| 27 | #define PLANAR 0 |
| 28 | #include "flacdsp_template.c" |
| 29 | #include "flacdsp_lpc_template.c" |
| 30 | |
| 31 | #undef PLANAR |
| 32 | #define PLANAR 1 |
| 33 | #include "flacdsp_template.c" |
| 34 | |
| 35 | #undef SAMPLE_SIZE |
| 36 | #undef PLANAR |
| 37 | #define SAMPLE_SIZE 32 |
| 38 | #define PLANAR 0 |
| 39 | #include "flacdsp_template.c" |
| 40 | #include "flacdsp_lpc_template.c" |
| 41 | |
| 42 | #undef PLANAR |
| 43 | #define PLANAR 1 |
| 44 | #include "flacdsp_template.c" |
| 45 | |
| 46 | static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32], |
| 47 | int pred_order, int qlevel, int len) |
| 48 | { |
| 49 | int i, j; |
| 50 | |
| 51 | for (i = pred_order; i < len - 1; i += 2, decoded += 2) { |
| 52 | int c = coeffs[0]; |
| 53 | int d = decoded[0]; |
| 54 | int s0 = 0, s1 = 0; |
| 55 | for (j = 1; j < pred_order; j++) { |
| 56 | s0 += c*d; |
| 57 | d = decoded[j]; |
| 58 | s1 += c*d; |
| 59 | c = coeffs[j]; |
| 60 | } |
| 61 | s0 += c*d; |
| 62 | d = decoded[j] += s0 >> qlevel; |
| 63 | s1 += c*d; |
| 64 | decoded[j + 1] += s1 >> qlevel; |
| 65 | } |
| 66 | if (i < len) { |
| 67 | int sum = 0; |
| 68 | for (j = 0; j < pred_order; j++) |
| 69 | sum += coeffs[j] * decoded[j]; |
| 70 | decoded[j] += sum >> qlevel; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32], |
| 75 | int pred_order, int qlevel, int len) |
| 76 | { |
| 77 | int i, j; |
| 78 | |
| 79 | for (i = pred_order; i < len; i++, decoded++) { |
| 80 | int64_t sum = 0; |
| 81 | for (j = 0; j < pred_order; j++) |
| 82 | sum += (int64_t)coeffs[j] * decoded[j]; |
| 83 | decoded[j] += sum >> qlevel; |
| 84 | } |
| 85 | |
| 86 | } |
| 87 | |
| 88 | av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, |
| 89 | int bps) |
| 90 | { |
| 91 | if (bps > 16) { |
| 92 | c->lpc = flac_lpc_32_c; |
| 93 | c->lpc_encode = flac_lpc_encode_c_32; |
| 94 | } else { |
| 95 | c->lpc = flac_lpc_16_c; |
| 96 | c->lpc_encode = flac_lpc_encode_c_16; |
| 97 | } |
| 98 | |
| 99 | switch (fmt) { |
| 100 | case AV_SAMPLE_FMT_S32: |
| 101 | c->decorrelate[0] = flac_decorrelate_indep_c_32; |
| 102 | c->decorrelate[1] = flac_decorrelate_ls_c_32; |
| 103 | c->decorrelate[2] = flac_decorrelate_rs_c_32; |
| 104 | c->decorrelate[3] = flac_decorrelate_ms_c_32; |
| 105 | break; |
| 106 | |
| 107 | case AV_SAMPLE_FMT_S32P: |
| 108 | c->decorrelate[0] = flac_decorrelate_indep_c_32p; |
| 109 | c->decorrelate[1] = flac_decorrelate_ls_c_32p; |
| 110 | c->decorrelate[2] = flac_decorrelate_rs_c_32p; |
| 111 | c->decorrelate[3] = flac_decorrelate_ms_c_32p; |
| 112 | break; |
| 113 | |
| 114 | case AV_SAMPLE_FMT_S16: |
| 115 | c->decorrelate[0] = flac_decorrelate_indep_c_16; |
| 116 | c->decorrelate[1] = flac_decorrelate_ls_c_16; |
| 117 | c->decorrelate[2] = flac_decorrelate_rs_c_16; |
| 118 | c->decorrelate[3] = flac_decorrelate_ms_c_16; |
| 119 | break; |
| 120 | |
| 121 | case AV_SAMPLE_FMT_S16P: |
| 122 | c->decorrelate[0] = flac_decorrelate_indep_c_16p; |
| 123 | c->decorrelate[1] = flac_decorrelate_ls_c_16p; |
| 124 | c->decorrelate[2] = flac_decorrelate_rs_c_16p; |
| 125 | c->decorrelate[3] = flac_decorrelate_ms_c_16p; |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | if (ARCH_ARM) |
| 130 | ff_flacdsp_init_arm(c, fmt, bps); |
| 131 | if (ARCH_X86) |
| 132 | ff_flacdsp_init_x86(c, fmt, bps); |
| 133 | } |