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