shithub: opus

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Add delay-compensation for non-causal PLC

--- a/dnn/lpcnet_demo.c

+++ b/dnn/lpcnet_demo.c

@@ -164,6 +164,8 @@

         short pcm[FRAME_SIZE];

         int count=0;

         int loss=0;

+        int skip=0, extra=0;

+        if ((plc_flags&0x3) == LPCNET_PLC_NONCAUSAL) skip=extra=80;

         LPCNetPLCState *net;

         net = lpcnet_plc_create(plc_flags);

         while (1) {

@@ -176,12 +178,14 @@

             }

             if (loss) lpcnet_plc_conceal(net, pcm);

             else lpcnet_plc_update(net, pcm);

-            //if (count)

-              fwrite(pcm, sizeof(pcm[0]), FRAME_SIZE, fout);

+            fwrite(&pcm[skip], sizeof(pcm[0]), FRAME_SIZE-skip, fout);

+            skip = 0;

             count++;

         }

-        //lpcnet_plc_conceal(net, pcm);

-        //fwrite(pcm, sizeof(pcm[0]), FRAME_SIZE, fout);

+        if (extra) {

+          lpcnet_plc_conceal(net, pcm);

+          fwrite(pcm, sizeof(pcm[0]), extra, fout);

+        }

         lpcnet_plc_destroy(net);

     } else {

         fprintf(stderr, "unknown action\n");

-- 

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