166 lines
5.4 KiB
C
166 lines
5.4 KiB
C
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/* $Id$ */
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/*
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __PJMEDIA_CODECS_G7221_H__
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#define __PJMEDIA_CODECS_G7221_H__
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/**
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* @file pjmedia-codec/g7221.h
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* @brief G722.1 codec.
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*/
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#include <pjmedia-codec/types.h>
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/**
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* @defgroup PJMED_G7221_CODEC G.722.1 Codec (Siren7/Siren14)
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* @ingroup PJMEDIA_CODEC_CODECS
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* @brief Implementation of G.722.1 codec
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* @{
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*
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* <b>G.722.1 licensed from Polycom<EFBFBD></b><br />
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* <b>G.722.1 Annex C licensed from Polycom<EFBFBD></b>
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*
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* This section describes functions to initialize and register G.722.1 codec
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* factory to the codec manager. After the codec factory has been registered,
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* application can use @ref PJMEDIA_CODEC API to manipulate the codec.
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*
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* PJMEDIA G722.1 codec implementation is based on ITU-T Recommendation
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* G.722.1 (05/2005) C fixed point implementation including its Annex C.
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*
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* G.722.1 is a low complexity codec that supports 7kHz and 14kHz audio
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* bandwidth working at bitrates ranging from 16kbps to 48kbps. It may be
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* used with speech or music inputs.
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*
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*
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* \section codec_setting Codec Settings
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*
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* \subsection general_setting General Settings
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*
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* General codec settings for this codec such as VAD and PLC can be
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* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
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* Please see the documentation of #pjmedia_codec_param for more info.
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*
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* \subsection specific_setting Codec Specific Settings
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*
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* The following settings are applicable for this codec.
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*
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* \subsubsection bitrate Bitrate
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*
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* The codec implementation supports standard and non-standard bitrates.
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* Use #pjmedia_codec_g7221_set_mode() to enable or disable the bitrates.
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*
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* By default, only standard bitrates are enabled upon initialization:
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* - for 7kHz audio bandwidth (16kHz sampling rate): 24kbps and 32kbps,
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* - for 14kHz audio bandwidth (32kHz sampling rate): 24kbps, 32kbps, and
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* 48kbps.
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*
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* The usage of non-standard bitrates must follow these requirements:
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* - for 7kHz audio bandwidth (16kHz sampling rate): 16000 to 32000 bps,
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* multiplication of 400
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* - for 14kHz audio bandwidth (32kHz sampling rate): 24000 to 48000 bps,
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* multiplication of 400
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*
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* The bitrate is set via <tt>param.setting.dec_fmtp</tt>, if it does not
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* contain bitrate info, the codec will check <tt>param.info.avg_bps</tt>.
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*
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* \note
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* Currently only up to two non-standard modes can be enabled.
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*
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* \remark
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* There is a flaw in the codec manager as currently it could not
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* differentiate G.722.1 codecs by bitrates, hence invoking
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* #pjmedia_codec_mgr_set_default_param() may only affect a G.722.1 codec
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* with the highest priority (or first index found in codec enumeration
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* when they have same priority) and invoking
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* #pjmedia_codec_mgr_set_codec_priority() will set priority of all G.722.1
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* codecs with sampling rate as specified.
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*/
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PJ_BEGIN_DECL
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/**
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* Initialize and register G.722.1 codec factory to pjmedia endpoint.
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*
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* @param endpt The pjmedia endpoint.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_codec_g7221_init( pjmedia_endpt *endpt );
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/**
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* Enable and disable G.722.1 mode. By default, the standard modes are
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* enabled upon initialization, i.e.:
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* - sampling rate 16kHz, bitrate 24kbps and 32kbps.
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* - sampling rate 32kHz, bitrate 24kbps, 32kbps, and 48kbps.
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* This function can also be used for enabling non-standard modes.
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* Note that currently only up to two non-standard modes can be enabled
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* at one time.
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*
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* @param sample_rate PCM sampling rate, in Hz, valid values are only
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* 16000 and 32000.
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* @param bitrate G722.1 bitrate, in bps, the valid values are
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* standard and non-standard bitrates as described
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* above.
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* @param enabled PJ_TRUE for enabling specified mode.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_codec_g7221_set_mode(unsigned sample_rate,
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unsigned bitrate,
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pj_bool_t enabled);
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/**
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* Set the G.722.1 codec encoder and decoder level adjustment.
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* If the value is non-zero, then PCM input samples to the encoder will
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* be shifted right by this value, and similarly PCM output samples from
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* the decoder will be shifted left by this value.
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*
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* \note
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* This function is also applicable for G722.1 implementation with IPP
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* back-end.
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*
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* Default value is PJMEDIA_G7221_DEFAULT_PCM_SHIFT.
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*
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* @param val The value
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_codec_g7221_set_pcm_shift(int val);
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/**
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* Unregister G.722.1 codecs factory from pjmedia endpoint.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_codec_g7221_deinit(void);
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PJ_END_DECL
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/**
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* @}
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*/
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#endif /* __PJMEDIA_CODECS_G7221_H__ */
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