Alexandre Lision | 8af73cb | 2013-12-10 14:11:20 -0500 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program 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 |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #ifndef __PJMEDIA_ALAW_ULAW_H__ |
| 21 | #define __PJMEDIA_ALAW_ULAW_H__ |
| 22 | |
| 23 | #include <pjmedia/types.h> |
| 24 | |
| 25 | PJ_BEGIN_DECL |
| 26 | |
| 27 | #if defined(PJMEDIA_HAS_ALAW_ULAW_TABLE) && PJMEDIA_HAS_ALAW_ULAW_TABLE!=0 |
| 28 | |
| 29 | extern const pj_uint8_t pjmedia_linear2ulaw_tab[16384]; |
| 30 | extern const pj_uint8_t pjmedia_linear2alaw_tab[16384]; |
| 31 | extern const pj_int16_t pjmedia_ulaw2linear_tab[256]; |
| 32 | extern const pj_int16_t pjmedia_alaw2linear_tab[256]; |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * Convert 16-bit linear PCM value to 8-bit A-Law. |
| 37 | * |
| 38 | * @param pcm_val 16-bit linear PCM value. |
| 39 | * @return 8-bit A-Law value. |
| 40 | */ |
| 41 | #define pjmedia_linear2alaw(pcm_val) \ |
| 42 | pjmedia_linear2alaw_tab[(((pj_int16_t)pcm_val) >> 2) & 0x3fff] |
| 43 | |
| 44 | /** |
| 45 | * Convert 8-bit A-Law value to 16-bit linear PCM value. |
| 46 | * |
| 47 | * @param chara_val 8-bit A-Law value. |
| 48 | * @return 16-bit linear PCM value. |
| 49 | */ |
| 50 | #define pjmedia_alaw2linear(chara_val) \ |
| 51 | pjmedia_alaw2linear_tab[chara_val] |
| 52 | |
| 53 | /** |
| 54 | * Convert 16-bit linear PCM value to 8-bit U-Law. |
| 55 | * |
| 56 | * @param pcm_val 16-bit linear PCM value. |
| 57 | * @return U-bit A-Law value. |
| 58 | */ |
| 59 | #define pjmedia_linear2ulaw(pcm_val) \ |
| 60 | pjmedia_linear2ulaw_tab[(((pj_int16_t)pcm_val) >> 2) & 0x3fff] |
| 61 | |
| 62 | /** |
| 63 | * Convert 8-bit U-Law value to 16-bit linear PCM value. |
| 64 | * |
| 65 | * @param u_val 8-bit U-Law value. |
| 66 | * @return 16-bit linear PCM value. |
| 67 | */ |
| 68 | #define pjmedia_ulaw2linear(u_val) \ |
| 69 | pjmedia_ulaw2linear_tab[u_val] |
| 70 | |
| 71 | /** |
| 72 | * Convert 8-bit A-Law value to 8-bit U-Law value. |
| 73 | * |
| 74 | * @param aval 8-bit A-Law value. |
| 75 | * @return 8-bit U-Law value. |
| 76 | */ |
| 77 | #define pjmedia_alaw2ulaw(aval) \ |
| 78 | pjmedia_linear2ulaw(pjmedia_alaw2linear(aval)) |
| 79 | |
| 80 | /** |
| 81 | * Convert 8-bit U-Law value to 8-bit A-Law value. |
| 82 | * |
| 83 | * @param uval 8-bit U-Law value. |
| 84 | * @return 8-bit A-Law value. |
| 85 | */ |
| 86 | #define pjmedia_ulaw2alaw(uval) \ |
| 87 | pjmedia_linear2alaw(pjmedia_ulaw2linear(uval)) |
| 88 | |
| 89 | |
| 90 | #else |
| 91 | |
| 92 | /** |
| 93 | * Convert 16-bit linear PCM value to 8-bit A-Law. |
| 94 | * |
| 95 | * @param pcm_val 16-bit linear PCM value. |
| 96 | * @return 8-bit A-Law value. |
| 97 | */ |
| 98 | PJ_DECL(pj_uint8_t) pjmedia_linear2alaw(int pcm_val); |
| 99 | |
| 100 | /** |
| 101 | * Convert 8-bit A-Law value to 16-bit linear PCM value. |
| 102 | * |
| 103 | * @param chara_val 8-bit A-Law value. |
| 104 | * @return 16-bit linear PCM value. |
| 105 | */ |
| 106 | PJ_DECL(int) pjmedia_alaw2linear(unsigned chara_val); |
| 107 | |
| 108 | /** |
| 109 | * Convert 16-bit linear PCM value to 8-bit U-Law. |
| 110 | * |
| 111 | * @param pcm_val 16-bit linear PCM value. |
| 112 | * @return U-bit A-Law value. |
| 113 | */ |
| 114 | PJ_DECL(unsigned char) pjmedia_linear2ulaw(int pcm_val); |
| 115 | |
| 116 | /** |
| 117 | * Convert 8-bit U-Law value to 16-bit linear PCM value. |
| 118 | * |
| 119 | * @param u_val 8-bit U-Law value. |
| 120 | * @return 16-bit linear PCM value. |
| 121 | */ |
| 122 | PJ_DECL(int) pjmedia_ulaw2linear(unsigned char u_val); |
| 123 | |
| 124 | /** |
| 125 | * Convert 8-bit A-Law value to 8-bit U-Law value. |
| 126 | * |
| 127 | * @param aval 8-bit A-Law value. |
| 128 | * @return 8-bit U-Law value. |
| 129 | */ |
| 130 | PJ_DECL(unsigned char) pjmedia_alaw2ulaw(unsigned char aval); |
| 131 | |
| 132 | /** |
| 133 | * Convert 8-bit U-Law value to 8-bit A-Law value. |
| 134 | * |
| 135 | * @param uval 8-bit U-Law value. |
| 136 | * @return 8-bit A-Law value. |
| 137 | */ |
| 138 | PJ_DECL(unsigned char) pjmedia_ulaw2alaw(unsigned char uval); |
| 139 | |
| 140 | #endif |
| 141 | |
| 142 | /** |
| 143 | * Encode 16-bit linear PCM data to 8-bit U-Law data. |
| 144 | * |
| 145 | * @param dst Destination buffer for 8-bit U-Law data. |
| 146 | * @param src Source, 16-bit linear PCM data. |
| 147 | * @param count Number of samples. |
| 148 | */ |
| 149 | PJ_INLINE(void) pjmedia_ulaw_encode(pj_uint8_t *dst, const pj_int16_t *src, |
| 150 | pj_size_t count) |
| 151 | { |
| 152 | const pj_int16_t *end = src + count; |
| 153 | |
| 154 | while (src < end) { |
| 155 | *dst++ = pjmedia_linear2ulaw(*src++); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Encode 16-bit linear PCM data to 8-bit A-Law data. |
| 161 | * |
| 162 | * @param dst Destination buffer for 8-bit A-Law data. |
| 163 | * @param src Source, 16-bit linear PCM data. |
| 164 | * @param count Number of samples. |
| 165 | */ |
| 166 | PJ_INLINE(void) pjmedia_alaw_encode(pj_uint8_t *dst, const pj_int16_t *src, |
| 167 | pj_size_t count) |
| 168 | { |
| 169 | const pj_int16_t *end = src + count; |
| 170 | |
| 171 | while (src < end) { |
| 172 | *dst++ = pjmedia_linear2alaw(*src++); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Decode 8-bit U-Law data to 16-bit linear PCM data. |
| 178 | * |
| 179 | * @param dst Destination buffer for 16-bit PCM data. |
| 180 | * @param src Source, 8-bit U-Law data. |
| 181 | * @param len Encoded frame/source length in bytes. |
| 182 | */ |
| 183 | PJ_INLINE(void) pjmedia_ulaw_decode(pj_int16_t *dst, const pj_uint8_t *src, |
| 184 | pj_size_t len) |
| 185 | { |
| 186 | const pj_uint8_t *end = src + len; |
| 187 | |
| 188 | while (src < end) { |
| 189 | *dst++ = pjmedia_ulaw2linear(*src++); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Decode 8-bit A-Law data to 16-bit linear PCM data. |
| 195 | * |
| 196 | * @param dst Destination buffer for 16-bit PCM data. |
| 197 | * @param src Source, 8-bit A-Law data. |
| 198 | * @param len Encoded frame/source length in bytes. |
| 199 | */ |
| 200 | PJ_INLINE(void) pjmedia_alaw_decode(pj_int16_t *dst, const pj_uint8_t *src, |
| 201 | pj_size_t len) |
| 202 | { |
| 203 | const pj_uint8_t *end = src + len; |
| 204 | |
| 205 | while (src < end) { |
| 206 | *dst++ = pjmedia_alaw2linear(*src++); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | PJ_END_DECL |
| 211 | |
| 212 | #endif /* __PJMEDIA_ALAW_ULAW_H__ */ |
| 213 | |