| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #ifndef __PJMEDIA_ALAW_ULAW_H__ |
| #define __PJMEDIA_ALAW_ULAW_H__ |
| |
| #include <pjmedia/types.h> |
| |
| PJ_BEGIN_DECL |
| |
| #if defined(PJMEDIA_HAS_ALAW_ULAW_TABLE) && PJMEDIA_HAS_ALAW_ULAW_TABLE!=0 |
| |
| extern const pj_uint8_t pjmedia_linear2ulaw_tab[16384]; |
| extern const pj_uint8_t pjmedia_linear2alaw_tab[16384]; |
| extern const pj_int16_t pjmedia_ulaw2linear_tab[256]; |
| extern const pj_int16_t pjmedia_alaw2linear_tab[256]; |
| |
| |
| /** |
| * Convert 16-bit linear PCM value to 8-bit A-Law. |
| * |
| * @param pcm_val 16-bit linear PCM value. |
| * @return 8-bit A-Law value. |
| */ |
| #define pjmedia_linear2alaw(pcm_val) \ |
| pjmedia_linear2alaw_tab[(((pj_int16_t)pcm_val) >> 2) & 0x3fff] |
| |
| /** |
| * Convert 8-bit A-Law value to 16-bit linear PCM value. |
| * |
| * @param chara_val 8-bit A-Law value. |
| * @return 16-bit linear PCM value. |
| */ |
| #define pjmedia_alaw2linear(chara_val) \ |
| pjmedia_alaw2linear_tab[chara_val] |
| |
| /** |
| * Convert 16-bit linear PCM value to 8-bit U-Law. |
| * |
| * @param pcm_val 16-bit linear PCM value. |
| * @return U-bit A-Law value. |
| */ |
| #define pjmedia_linear2ulaw(pcm_val) \ |
| pjmedia_linear2ulaw_tab[(((pj_int16_t)pcm_val) >> 2) & 0x3fff] |
| |
| /** |
| * Convert 8-bit U-Law value to 16-bit linear PCM value. |
| * |
| * @param u_val 8-bit U-Law value. |
| * @return 16-bit linear PCM value. |
| */ |
| #define pjmedia_ulaw2linear(u_val) \ |
| pjmedia_ulaw2linear_tab[u_val] |
| |
| /** |
| * Convert 8-bit A-Law value to 8-bit U-Law value. |
| * |
| * @param aval 8-bit A-Law value. |
| * @return 8-bit U-Law value. |
| */ |
| #define pjmedia_alaw2ulaw(aval) \ |
| pjmedia_linear2ulaw(pjmedia_alaw2linear(aval)) |
| |
| /** |
| * Convert 8-bit U-Law value to 8-bit A-Law value. |
| * |
| * @param uval 8-bit U-Law value. |
| * @return 8-bit A-Law value. |
| */ |
| #define pjmedia_ulaw2alaw(uval) \ |
| pjmedia_linear2alaw(pjmedia_ulaw2linear(uval)) |
| |
| |
| #else |
| |
| /** |
| * Convert 16-bit linear PCM value to 8-bit A-Law. |
| * |
| * @param pcm_val 16-bit linear PCM value. |
| * @return 8-bit A-Law value. |
| */ |
| PJ_DECL(pj_uint8_t) pjmedia_linear2alaw(int pcm_val); |
| |
| /** |
| * Convert 8-bit A-Law value to 16-bit linear PCM value. |
| * |
| * @param chara_val 8-bit A-Law value. |
| * @return 16-bit linear PCM value. |
| */ |
| PJ_DECL(int) pjmedia_alaw2linear(unsigned chara_val); |
| |
| /** |
| * Convert 16-bit linear PCM value to 8-bit U-Law. |
| * |
| * @param pcm_val 16-bit linear PCM value. |
| * @return U-bit A-Law value. |
| */ |
| PJ_DECL(unsigned char) pjmedia_linear2ulaw(int pcm_val); |
| |
| /** |
| * Convert 8-bit U-Law value to 16-bit linear PCM value. |
| * |
| * @param u_val 8-bit U-Law value. |
| * @return 16-bit linear PCM value. |
| */ |
| PJ_DECL(int) pjmedia_ulaw2linear(unsigned char u_val); |
| |
| /** |
| * Convert 8-bit A-Law value to 8-bit U-Law value. |
| * |
| * @param aval 8-bit A-Law value. |
| * @return 8-bit U-Law value. |
| */ |
| PJ_DECL(unsigned char) pjmedia_alaw2ulaw(unsigned char aval); |
| |
| /** |
| * Convert 8-bit U-Law value to 8-bit A-Law value. |
| * |
| * @param uval 8-bit U-Law value. |
| * @return 8-bit A-Law value. |
| */ |
| PJ_DECL(unsigned char) pjmedia_ulaw2alaw(unsigned char uval); |
| |
| #endif |
| |
| /** |
| * Encode 16-bit linear PCM data to 8-bit U-Law data. |
| * |
| * @param dst Destination buffer for 8-bit U-Law data. |
| * @param src Source, 16-bit linear PCM data. |
| * @param count Number of samples. |
| */ |
| PJ_INLINE(void) pjmedia_ulaw_encode(pj_uint8_t *dst, const pj_int16_t *src, |
| pj_size_t count) |
| { |
| const pj_int16_t *end = src + count; |
| |
| while (src < end) { |
| *dst++ = pjmedia_linear2ulaw(*src++); |
| } |
| } |
| |
| /** |
| * Encode 16-bit linear PCM data to 8-bit A-Law data. |
| * |
| * @param dst Destination buffer for 8-bit A-Law data. |
| * @param src Source, 16-bit linear PCM data. |
| * @param count Number of samples. |
| */ |
| PJ_INLINE(void) pjmedia_alaw_encode(pj_uint8_t *dst, const pj_int16_t *src, |
| pj_size_t count) |
| { |
| const pj_int16_t *end = src + count; |
| |
| while (src < end) { |
| *dst++ = pjmedia_linear2alaw(*src++); |
| } |
| } |
| |
| /** |
| * Decode 8-bit U-Law data to 16-bit linear PCM data. |
| * |
| * @param dst Destination buffer for 16-bit PCM data. |
| * @param src Source, 8-bit U-Law data. |
| * @param len Encoded frame/source length in bytes. |
| */ |
| PJ_INLINE(void) pjmedia_ulaw_decode(pj_int16_t *dst, const pj_uint8_t *src, |
| pj_size_t len) |
| { |
| const pj_uint8_t *end = src + len; |
| |
| while (src < end) { |
| *dst++ = pjmedia_ulaw2linear(*src++); |
| } |
| } |
| |
| /** |
| * Decode 8-bit A-Law data to 16-bit linear PCM data. |
| * |
| * @param dst Destination buffer for 16-bit PCM data. |
| * @param src Source, 8-bit A-Law data. |
| * @param len Encoded frame/source length in bytes. |
| */ |
| PJ_INLINE(void) pjmedia_alaw_decode(pj_int16_t *dst, const pj_uint8_t *src, |
| pj_size_t len) |
| { |
| const pj_uint8_t *end = src + len; |
| |
| while (src < end) { |
| *dst++ = pjmedia_alaw2linear(*src++); |
| } |
| } |
| |
| PJ_END_DECL |
| |
| #endif /* __PJMEDIA_ALAW_ULAW_H__ */ |
| |