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files >> //usr/include/pjmedia/plc.h
/* * 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_PLC_H__ #define __PJMEDIA_PLC_H__ /** * @file plc.h * @brief Packet Lost Concealment (PLC) API. */ #include <pjmedia/types.h> /** * @defgroup PJMED_PLC Packet Lost Concealment (PLC) * @ingroup PJMEDIA_FRAME_OP * @brief Packet lost compensation algorithm * @{ * * This section describes PJMEDIA's implementation of Packet Lost * Concealment algorithm. This algorithm is used to implement PLC for * codecs that do not have built-in support for one (e.g. G.711 or GSM * codecs). * * The PLC algorithm (either built-in or external) is embedded in * PJMEDIA codec instance, and application can conceal lost frames * by calling <b><tt>recover()</tt></b> member of the codec's member * operation (#pjmedia_codec_op). * * See also @ref plc_codec for more info. */ PJ_BEGIN_DECL /** * Opaque declaration for PLC. */ typedef struct pjmedia_plc pjmedia_plc; /** * Create PLC session. This function will select the PLC algorithm to * use based on the arguments. * * @param pool Pool to allocate memory for the PLC. * @param clock_rate Media sampling rate. * @param samples_per_frame Number of samples per frame. * @param options Must be zero for now. * @param p_plc Pointer to receive the PLC instance. * * @return PJ_SUCCESS on success. */ PJ_DECL(pj_status_t) pjmedia_plc_create( pj_pool_t *pool, unsigned clock_rate, unsigned samples_per_frame, unsigned options, pjmedia_plc **p_plc); /** * Save a good frame to PLC. * * @param plc The PLC session. * @param frame The good frame to be stored to PLC. This frame * must have the same length as the configured * samples per frame. * * @return PJ_SUCCESS on success. */ PJ_DECL(pj_status_t) pjmedia_plc_save( pjmedia_plc *plc, pj_int16_t *frame ); /** * Generate a replacement for lost frame. * * @param plc The PLC session. * @param frame Buffer to receive the generated frame. This buffer * must be able to store the frame. * * @return PJ_SUCCESS on success. */ PJ_DECL(pj_status_t) pjmedia_plc_generate( pjmedia_plc *plc, pj_int16_t *frame ); PJ_END_DECL /** * @} */ #endif /* __PJMEDIA_PLC_H__ */