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/* $Id$ */
/*
* Copyright (C) 2003-2006 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>
#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
#endif /* __PJMEDIA_ALAW_ULAW_H__ */
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