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/* $Id$ */
/*
* Copyright (C) 2008-2009 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_CODECS_G7221_H__
#define __PJMEDIA_CODECS_G7221_H__
/**
* @file pjmedia-codec/g7221.h
* @brief G722.1 codec.
*/
#include <pjmedia-codec/types.h>
/**
* @defgroup PJMED_G7221_CODEC G722.1 Codec
* @ingroup PJMEDIA_CODEC
* @brief Implementation of G722.1 codec
* @{
*
* <b>G722.1 licensed from Polycom®</b>
* <b>G722.1 Annex C licensed from Polycom®</b>
*
* This section describes functions to register and register G722.1 codec
* factory to the codec manager. After the codec factory has been registered,
* application can use @ref PJMEDIA_CODEC API to manipulate the codec.
*
* PJMEDIA G722.1 codec implementation is based on ITU-T Recommendation
* G.722.1 (05/2005) C fixed point implementation including its Annex C.
*
* G722.1 is a low complexity codec that supports for 7kHz and 14kHz bandwidth
* audio signals working at bitrates ranging from 16kbps to 48kbps. It may be
* used with speech or music inputs.
*
* The codec implementation supports for standard and non-standard bitrates.
* By default, the standard bitrates are enabled upon initialization, i.e.:
* - 24kbps and 32kbps for audio bandwidth 7 kHz (16kHz sampling rate),
* - 24kbps, 32kbps, and 48kbps for audio bandwidth 14 kHz (32kHz sampling
* rate).
* The usage of non-standard bitrates must follow this requirements:
* - for sampling rate 16kHz: 16000 to 32000 bps, it must be a multiple of 400
* - for sampling rate 32kHz: 24000 to 48000 bps, it must be a multiple of 400
* Note that currently it is only up to two non-standard modes can be enabled
* at one time.
*/
PJ_BEGIN_DECL
/**
* Initialize and register G722.1 codec factory to pjmedia endpoint.
*
* @param endpt The pjmedia endpoint.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_g7221_init( pjmedia_endpt *endpt );
/**
* Enable and disable G722.1 mode. By default, the standard modes are
* enabled upon initialization, i.e.:
* - sampling rate 16kHz, bitrate 24kbps and 32kbps.
* - sampling rate 32kHz, bitrate 24kbps, 32kbps, and 48kbps.
* This function can also be used for enabling non-standard modes.
* Note that currently it is only up to two non-standard modes can be
* enabled at one time.
*
* @param sample_rate PCM sampling rate, in Hz, valid values are only
* 16000 and 32000.
* @param bitrate G722.1 bitrate, in bps, the valid values are
* standard and non-standard bitrates as described
* above.
* @param enabled PJ_TRUE for enabling specified mode.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_g7221_set_mode(unsigned sample_rate,
unsigned bitrate,
pj_bool_t enabled);
/**
* Set the G.722.1 codec encoder and decoder level adjustment.
* If the value is non-zero, then PCM input samples to the encoder will
* be shifted right by this value, and similarly PCM output samples from
* the decoder will be shifted left by this value.
*
* Default value is PJMEDIA_G7221_DEFAULT_PCM_SHIFT.
*
* @param val The value
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_g7221_set_pcm_shift(int val);
/**
* Unregister G722.1 codecs factory from pjmedia endpoint.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_g7221_deinit(void);
PJ_END_DECL
/**
* @}
*/
#endif /* __PJMEDIA_CODECS_G7221_H__ */
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