132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
/*
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* Copyright (C)2020 Teluu Inc. (http://www.teluu.com)
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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_CODEC_AND_AUD_MEDIACODEC_H__
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#define __PJMEDIA_CODEC_AND_AUD_MEDIACODEC_H__
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/**
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* @file and_aud_mediacodec.h
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* @brief Android audio MediaCodec codecs.
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*/
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#include <pjmedia-codec/types.h>
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/**
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* @defgroup PJMEDIA_CODEC_AUD_MEDIACODEC Audio MediaCodec Codec
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* @ingroup PJMEDIA_CODEC_CODECS
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* @{
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*
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* Audio MediaCodec codec wrapper for Android.
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*
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* This codec wrapper contains varius codecs: i.e: AMR and AMR-WB.
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*
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* \section pjmedia_codec_mediacodec_AMR MediaCodec AMRNB/AMR-WB
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*
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* MediaCodec 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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* \subsection and_aud_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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* Note that MediaCodec doesn't provide internal VAD/PLC feature, they will be
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* provided by PJMEDIA instead.
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*
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* \subsubsection and_aud_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 and_aud_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 and_aud_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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PJ_BEGIN_DECL
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/**
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* Initialize and register Android audio MediaCodec factory to pjmedia
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* 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_and_media_aud_init( pjmedia_endpt *endpt );
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/**
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* Unregister Android audio MediaCodec factory from pjmedia endpoint
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* and deinitialize the codec 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_and_media_aud_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_CODEC_AND_AUD_MEDIACODEC_H__ */
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