Added configure option to enable error-concealment. Disabled by default.

Change-Id: I94580a5ecb13520195ea2b8a10ca11bb5a01d2a6

configure

@@ -37,6 +37,7 @@ Advanced options:
   ${toggle_multithread}           multithreaded encoding and decoding.
   ${toggle_spatial_resampling}    spatial sampling (scaling) support
   ${toggle_realtime_only}         enable this option while building for real-time encoding
+  ${toggle_error_concealment}     enable this option to get a decoder which is able to conceal losses
   ${toggle_runtime_cpu_detect}    runtime cpu detection
   ${toggle_shared}                shared library support
   ${toggle_small}                 favor smaller size over speed
@@ -249,6 +250,7 @@ CONFIG_LIST="
     static_msvcrt
     spatial_resampling
     realtime_only
+    error_concealment
     shared
     small
     arm_asm_detok
@@ -289,6 +291,7 @@ CMDLINE_SELECT="
     mem_tracker
     spatial_resampling
     realtime_only
+    error_concealment
     shared
     small
     arm_asm_detok

vp8/decoder/onyxd_if.c

@@ -135,6 +135,13 @@ VP8D_PTR vp8dx_create_decompressor(VP8D_CONFIG *oxcf)
     vp8_init_detokenizer(pbi);
 #endif
     pbi->common.error.setjmp = 0;
+
+#if CONFIG_ERROR_CONCEALMENT
+    pbi->ec_enabled = 1;
+#else
+    pbi->ec_enabled = 0;
+#endif
+
     return (VP8D_PTR) pbi;
 }
 
@@ -320,8 +327,6 @@ int vp8dx_receive_compressed_data(VP8D_PTR ptr, unsigned long size, const unsign
     int retcode = 0;
     struct vpx_usec_timer timer;
 
-    pbi->ec_enabled = 1;
-
     /*if(pbi->ready_for_new_data == 0)
         return -1;*/