D-Modem/pjproject-2.11.1/pjmedia/include/pjmedia-codec/ipp_codecs.h
2021-10-29 14:41:03 -04:00

322 lines
12 KiB
C

/* $Id$ */
/*
* 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_CODECS_IPP_H__
#define __PJMEDIA_CODECS_IPP_H__
/**
* @file pjmedia-codec/ipp_codecs.h
* @brief IPP codecs wrapper.
*/
#include <pjmedia-codec/types.h>
/**
* @defgroup PJMED_IPP_CODEC IPP Codecs
* @ingroup PJMEDIA_CODEC_CODECS
* @brief Implementation of IPP codecs
* @{
*
* This section describes functions to initialize and register IPP codec
* factory to the codec manager. After the codec factory has been registered,
* application can use @ref PJMEDIA_CODEC API to manipulate the codec.
*
* This codec factory contains various codecs, i.e: G.729, G.723.1, G.726,
* G.728, G.722.1, AMR, and AMR-WB.
*
*
* \section pjmedia_codec_ipp_g729 IPP G.729
*
* IPP G.729 is compliant with ITU-T G.729 and Annexes A, B, C, C+, D,
* E, I specifications. However, currently the pjmedia implementation is
* using Annexes A and B only.
*
* IPP G.729 supports 16-bit PCM audio signal with sampling rate 8000Hz,
* frame length 10ms, and resulting in bitrate 8000bps (annexes D and E
* introduce bitrates 6400bps and 11800bps).
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
* Note that G.729 VAD status should be signalled in SDP, see more
* description below.
*
* \subsubsection annexb Annex B
*
* The capability of VAD/DTX is specified in Annex B.
*
* By default, Annex B is enabled. This default setting of Annex B can
* be modified using #pjmedia_codec_mgr_set_default_param().
*
* In #pjmedia_codec_param, Annex B is configured via VAD setting and
* format parameter "annexb" in the SDP "a=fmtp" attribute in
* decoding fmtp field. Valid values are "yes" and "no",
* the implementation default is "yes". When this parameter is omitted
* in the SDP, the value will be "yes" (RFC 4856 Section 2.1.9).
*
* Here is an example of modifying default setting of Annex B to
* be disabled using #pjmedia_codec_mgr_set_default_param():
\code
pjmedia_codec_param param;
pjmedia_codec_mgr_get_default_param(.., &param);
...
// Set VAD
param.setting.vad = 0;
// Set SDP format parameter
param.setting.dec_fmtp.cnt = 1;
param.setting.dec_fmtp.param[0].name = pj_str("annexb");
param.setting.dec_fmtp.param[0].val = pj_str("no");
...
pjmedia_codec_mgr_set_default_param(.., &param);
\endcode
*
* \note
* The difference of Annex B status in SDP offer/answer may be considered as
* incompatible codec in SDP negotiation.
*
*
* \section pjmedia_codec_ipp_g7231 IPP G.723.1
*
* IPP G.723.1 speech codec is compliant with ITU-T G.723.1 and Annex A
* specifications.
*
* IPP G.723.1 supports 16-bit PCM audio signal with sampling rate 8000Hz,
* frame length 30ms, and resulting in bitrates 5300bps and 6300bps.
*
* By default, pjmedia implementation uses encoding bitrate of 6300bps.
* The bitrate is signalled in-band in G.723.1 frames and interoperable.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
*
* \section pjmedia_codec_ipp_g726 IPP G.726
*
* IPP G.726 is compliant with ITU-T G.726 and G.726 Annex A specifications.
*
* IPP G.726 supports 16-bit PCM audio signal with sampling rate 8000Hz,
* 10ms frame length and producing 16kbps, 24kbps, 32kbps, 48kbps bitrates.
* The bitrate is specified explicitly in its encoding name, i.e: G726-16,
* G726-24, G726-32, G726-48.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
*
* \section pjmedia_codec_ipp_g728 IPP G.728
*
* IPP G.728 is compliant with ITU-T G.728 with I, G, H Appendixes
* specifications for Low-Delay CELP coder.
*
* IPP G.728 supports 16-bit PCM audio signal with sampling rate 8000Hz,
* 20ms frame length and producing 9.6kbps, 12.8kbps, and 16kbps bitrates.
*
* The pjmedia implementation currently uses 16kbps bitrate only.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
*
* \section pjmedia_codec_ipp_g7221 IPP G.722.1
*
* The pjmedia implementation of IPP G.722.1 supports 16-bit PCM audio
* signal with sampling rate 16000Hz, 20ms frame length and producing
* 16kbps, 24kbps, and 32kbps bitrates.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
* \subsubsection bitrate Bitrate
*
* The codec implementation supports only standard bitrates, i.e:
* 24kbps and 32kbps. Both are enabled by default.
*
* \remark
* There is a flaw in the codec manager as currently it could not
* differentiate G.722.1 codecs by bitrates, hence invoking
* #pjmedia_codec_mgr_set_default_param() may only affect a G.722.1 codec
* with the highest priority (or first index found in codec enumeration
* when they have same priority) and invoking
* #pjmedia_codec_mgr_set_codec_priority() will set priority of all G.722.1
* codecs with sampling rate as specified.
*
*
* \section pjmedia_codec_ipp_amr IPP AMR
*
* The IPP AMR is compliant with GSM06.90-94 specifications for GSM Adaptive
* Multi-Rate codec.
*
* IPP AMR supports 16-bit PCM audio signal with sampling rate 8000Hz,
* 20ms frame length and producing various bitrates that ranges from 4.75kbps
* to 12.2kbps.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
* \subsubsection bitrate Bitrate
*
* By default, encoding bitrate is 7400bps. This default setting can be
* modified using #pjmedia_codec_mgr_set_default_param() by specifying
* prefered AMR bitrate in field <tt>info::avg_bps</tt> of
* #pjmedia_codec_param. Valid bitrates could be seen in
* #pjmedia_codec_amrnb_bitrates.
*
* \subsubsection payload_format Payload Format
*
* There are two AMR payload format types, bandwidth-efficient and
* octet-aligned. Default setting is using octet-aligned. This default payload
* format can be modified using #pjmedia_codec_mgr_set_default_param().
*
* In #pjmedia_codec_param, payload format can be set by specifying SDP
* format parameters "octet-align" in the SDP "a=fmtp" attribute for
* decoding direction. Valid values are "0" (for bandwidth efficient mode)
* and "1" (for octet-aligned mode).
*
* \subsubsection mode_set Mode-Set
*
* Mode-set is used for restricting AMR modes in decoding direction.
*
* By default, no mode-set restriction applied. This default setting can be
* be modified using #pjmedia_codec_mgr_set_default_param().
*
* In #pjmedia_codec_param, mode-set could be specified via format parameters
* "mode-set" in the SDP "a=fmtp" attribute for decoding direction. Valid
* value is a comma separated list of modes from the set 0 - 7, e.g:
* "4,5,6,7". When this parameter is omitted, no mode-set restrictions applied.
*
* Here is an example of modifying AMR default codec param:
\code
pjmedia_codec_param param;
pjmedia_codec_mgr_get_default_param(.., &param);
...
// set default encoding bitrate to the highest 12.2kbps
param.info.avg_bps = 12200;
// restrict decoding bitrate to 10.2kbps and 12.2kbps only
param.setting.dec_fmtp.param[0].name = pj_str("mode-set");
param.setting.dec_fmtp.param[0].val = pj_str("6,7");
// also set to use bandwidth-efficient payload format
param.setting.dec_fmtp.param[1].name = pj_str("octet-align");
param.setting.dec_fmtp.param[1].val = pj_str("0");
param.setting.dec_fmtp.cnt = 2;
...
pjmedia_codec_mgr_set_default_param(.., &param);
\endcode
*
*
* \section pjmedia_codec_ipp_amrwb IPP AMR-WB
*
* The IPP AMR-WB is compliant with 3GPP TS 26.190-192, 194, 201
* specifications for Adaptive Multi-Rate WideBand codec.
*
* IPP AMR-WB supports 16-bit PCM audio signal with sampling rate 16000Hz,
* 20ms frame length and producing various bitrates. Valid bitrates could be
* seen in #pjmedia_codec_amrwb_bitrates. The pjmedia implementation default
* bitrate is 15850bps.
*
* \subsection codec_setting Codec Settings
*
* General codec settings for this codec such as VAD and PLC can be
* manipulated through the <tt>setting</tt> field in #pjmedia_codec_param.
* Please see the documentation of #pjmedia_codec_param for more info.
*
* \subsubsection bitrate Bitrate
*
* By default, encoding bitrate is 15850bps. This default setting can be
* modified using #pjmedia_codec_mgr_set_default_param() by specifying
* prefered AMR bitrate in field <tt>info::avg_bps</tt> of
* #pjmedia_codec_param.
*
* \subsubsection payload_format Payload Format
*
* There are two AMR payload format types, bandwidth-efficient and
* octet-aligned. Default setting is using octet-aligned. This default payload
* format can be modified using #pjmedia_codec_mgr_set_default_param().
*
* In #pjmedia_codec_param, payload format can be set by specifying SDP
* format parameters "octet-align" in the SDP "a=fmtp" attribute for
* decoding direction. Valid values are "0" (for bandwidth efficient mode)
* and "1" (for octet-aligned mode).
*
* \subsubsection mode_set Mode-Set
*
* Mode-set is used for restricting AMR modes in decoding direction.
*
* By default, no mode-set restriction applied. This default setting can be
* be modified using #pjmedia_codec_mgr_set_default_param().
*
* In #pjmedia_codec_param, mode-set could be specified via format parameters
* "mode-set" in the SDP "a=fmtp" attribute for decoding direction. Valid
* value is a comma separated list of modes from the set 0 - 7, e.g:
* "4,5,6,7". When this parameter is omitted, no mode-set restrictions applied.
*/
PJ_BEGIN_DECL
/**
* Initialize and register IPP codecs factory to pjmedia endpoint.
*
* @param endpt The pjmedia endpoint.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_ipp_init( pjmedia_endpt *endpt );
/**
* Unregister IPP codecs factory from pjmedia endpoint and deinitialize
* the IPP codecs library.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_codec_ipp_deinit(void);
PJ_END_DECL
/**
* @}
*/
#endif /* __PJMEDIA_CODECS_IPP_H__ */