Worked on the AEC. Apply constant delay bufferring for the AEC,

and also consider sound device latency when applying EC. It
sounds like working although it still doesn't perfectly cancel
the echo.

EC is now by default enabled in PJSUA.



git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@822 74dad513-b988-da41-8d7b-12977e46ad98

2 files changed, 8 insertions, 0 deletions

diff --git a/pjmedia/include/pjmedia/echo.h b/pjmedia/include/pjmedia/echo.h
index c872bce9..96e2bffe 100644
--- a/pjmedia/include/pjmedia/echo.h
+++ b/pjmedia/include/pjmedia/echo.h
@@ -82,6 +82,9 @@ typedef enum pjmedia_echo_flag
  * @param clock_rate	    Media clock rate/sampling rate.
  * @param samples_per_frame Number of samples per frame.
  * @param tail_ms	    Tail length, miliseconds.
+ * @param latency_ms	    Total lacency introduced by playback and 
+ *			    recording device. Set to zero if the latency
+ *			    is not known.
  * @param options	    Options. If PJMEDIA_ECHO_SIMPLE is specified,
  *			    then a simple echo suppressor implementation 
  *			    will be used instead of an accoustic echo 
@@ -95,6 +98,7 @@ PJ_DECL(pj_status_t) pjmedia_echo_create(pj_pool_t *pool,
 					 unsigned clock_rate,
 					 unsigned samples_per_frame,
 					 unsigned tail_ms,
+					 unsigned latency_ms,
 					 unsigned options,
 					 pjmedia_echo_state **p_echo );
 
diff --git a/pjmedia/include/pjmedia/echo_port.h b/pjmedia/include/pjmedia/echo_port.h
index d05c1a43..9b2d89e4 100644
--- a/pjmedia/include/pjmedia/echo_port.h
+++ b/pjmedia/include/pjmedia/echo_port.h
@@ -46,6 +46,9 @@ PJ_BEGIN_DECL
  * @param pool		Pool to allocate memory.
  * @param dn_port	Downstream port.
  * @param tail_ms	Tail length in miliseconds.
+ * @param latency_ms	Total lacency introduced by playback and 
+ *			recording device. Set to zero if the latency
+ *			is not known.
  * @param options	Options, as in #pjmedia_echo_create().
  * @param p_port	Pointer to receive the port instance.
  *
@@ -54,6 +57,7 @@ PJ_BEGIN_DECL
 PJ_DECL(pj_status_t) pjmedia_echo_port_create(pj_pool_t *pool,
 					      pjmedia_port *dn_port,
 					      unsigned tail_ms,
+					      unsigned latency_ms,
 					      unsigned options,
 					      pjmedia_port **p_port );