Added Packet Lost Concealment (PLC) framework, with two backend algorithms (simple replay and G.711 Appendix I)

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@417 74dad513-b988-da41-8d7b-12977e46ad98

3 files changed, 113 insertions, 0 deletions

diff --git a/pjmedia/include/pjmedia.h b/pjmedia/include/pjmedia.h
index d0728ff5..c0869e9d 100644
--- a/pjmedia/include/pjmedia.h
+++ b/pjmedia/include/pjmedia.h
@@ -34,6 +34,7 @@
 #include <pjmedia/jbuf.h>
 #include <pjmedia/master_port.h>
 #include <pjmedia/null_port.h>
+#include <pjmedia/plc.h>
 #include <pjmedia/port.h>
 #include <pjmedia/resample.h>
 #include <pjmedia/rtcp.h>
diff --git a/pjmedia/include/pjmedia/config.h b/pjmedia/include/pjmedia/config.h
index 918ab3ea..980d377f 100644
--- a/pjmedia/include/pjmedia/config.h
+++ b/pjmedia/include/pjmedia/config.h
@@ -117,6 +117,16 @@
 #endif
 
 
+/**
+ * G.711 Appendix I Packet Lost Concealment (PLC).
+ * Enabled only when floating point is enabled.
+ */
+#ifndef PJMEDIA_HAS_G711_PLC
+#   define PJMEDIA_HAS_G711_PLC			PJ_HAS_FLOATING_POINT
+#endif
+
+
+
 #endif	/* __PJMEDIA_CONFIG_H__ */
 
 
diff --git a/pjmedia/include/pjmedia/plc.h b/pjmedia/include/pjmedia/plc.h
new file mode 100644
index 00000000..e0631c73
--- /dev/null
+++ b/pjmedia/include/pjmedia/plc.h
@@ -0,0 +1,102 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2003-2006 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
+ * @ingroup PJMEDIA
+ * @{
+ *
+ */
+
+
+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__ */
+