1
/* $Id: plc.h 2394 2008-12-23 17:27:53Z bennylp $ */
3
* Copyright (C) 2008-2009 Teluu Inc. (http://www.teluu.com)
4
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; either version 2 of the License, or
9
* (at your option) any later version.
11
* This program is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with this program; if not, write to the Free Software
18
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20
* Additional permission under GNU GPL version 3 section 7:
22
* If you modify this program, or any covered work, by linking or
23
* combining it with the OpenSSL project's OpenSSL library (or a
24
* modified version of that library), containing parts covered by the
25
* terms of the OpenSSL or SSLeay licenses, Teluu Inc. (http://www.teluu.com)
26
* grants you additional permission to convey the resulting work.
27
* Corresponding Source for a non-source form of such a combination
28
* shall include the source code for the parts of OpenSSL used as well
29
* as that of the covered work.
31
#ifndef __PJMEDIA_PLC_H__
32
#define __PJMEDIA_PLC_H__
37
* @brief Packet Lost Concealment (PLC) API.
39
#include <pjmedia/types.h>
42
* @defgroup PJMED_PLC Packet Lost Concealment (PLC)
43
* @ingroup PJMEDIA_FRAME_OP
44
* @brief Packet lost compensation algorithm
47
* This section describes PJMEDIA's implementation of Packet Lost
48
* Concealment algorithm. This algorithm is used to implement PLC for
49
* codecs that do not have built-in support for one (e.g. G.711 or GSM
52
* The PLC algorithm (either built-in or external) is embedded in
53
* PJMEDIA codec instance, and application can conceal lost frames
54
* by calling <b><tt>recover()</tt></b> member of the codec's member
55
* operation (#pjmedia_codec_op).
57
* See also @ref plc_codec for more info.
65
* Opaque declaration for PLC.
67
typedef struct pjmedia_plc pjmedia_plc;
72
* Create PLC session. This function will select the PLC algorithm to
73
* use based on the arguments.
75
* @param pool Pool to allocate memory for the PLC.
76
* @param clock_rate Media sampling rate.
77
* @param samples_per_frame Number of samples per frame.
78
* @param options Must be zero for now.
79
* @param p_plc Pointer to receive the PLC instance.
81
* @return PJ_SUCCESS on success.
83
PJ_DECL(pj_status_t) pjmedia_plc_create( pj_pool_t *pool,
85
unsigned samples_per_frame,
91
* Save a good frame to PLC.
93
* @param plc The PLC session.
94
* @param frame The good frame to be stored to PLC. This frame
95
* must have the same length as the configured
98
* @return PJ_SUCCESS on success.
100
PJ_DECL(pj_status_t) pjmedia_plc_save( pjmedia_plc *plc,
105
* Generate a replacement for lost frame.
107
* @param plc The PLC session.
108
* @param frame Buffer to receive the generated frame. This buffer
109
* must be able to store the frame.
111
* @return PJ_SUCCESS on success.
113
PJ_DECL(pj_status_t) pjmedia_plc_generate( pjmedia_plc *plc,
125
#endif /* __PJMEDIA_PLC_H__ */