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Add some basic testing for OPUS_{GET|SET}_PREDICTION_DISABLED.

--- a/tests/test_opus_api.c

+++ b/tests/test_opus_api.c

@@ -1352,6 +1352,16 @@

      "    OPUS_SET_LSB_DEPTH ........................... OK.\n",

      "    OPUS_GET_LSB_DEPTH ........................... OK.\n")

+   err=opus_encoder_ctl(enc,OPUS_GET_PREDICTION_DISABLED(&i));

+   if(i!=0)test_failed();

+   cfgs++;

+   err=opus_encoder_ctl(enc,OPUS_GET_PREDICTION_DISABLED((opus_int32 *)NULL));

+   if(err!=OPUS_BAD_ARG)test_failed();

+   cfgs++;

+   CHECK_SETGET(OPUS_SET_PREDICTION_DISABLED(i),OPUS_GET_PREDICTION_DISABLED(&i),-1,2,1,0,

+     "    OPUS_SET_PREDICTION_DISABLED ................. OK.\n",

+     "    OPUS_GET_PREDICTION_DISABLED ................. OK.\n")

+

    err=opus_encoder_ctl(enc,OPUS_GET_EXPERT_FRAME_DURATION((opus_int32 *)NULL));

    if(err!=OPUS_BAD_ARG)test_failed();

    cfgs++;

--- a/tests/test_opus_encode.c

+++ b/tests/test_opus_encode.c

@@ -308,7 +308,9 @@

          if(opus_multistream_encoder_ctl(MSenc, OPUS_SET_BITRATE(rate))!=OPUS_OK)test_failed();

          count=i=0;

          do {

-            int len,out_samples,frame_size,loss;

+            int pred,len,out_samples,frame_size,loss;

+            if(opus_multistream_encoder_ctl(MSenc, OPUS_GET_PREDICTION_DISABLED(&pred))!=OPUS_OK)test_failed();

+            if(opus_multistream_encoder_ctl(MSenc, OPUS_SET_PREDICTION_DISABLED((fast_rand()&15)<(pred?11:4)))!=OPUS_OK)test_failed();

             frame_size=frame[j];

             if(opus_multistream_encoder_ctl(MSenc, OPUS_SET_COMPLEXITY((count>>2)%11))!=OPUS_OK)test_failed();

             if(opus_multistream_encoder_ctl(MSenc, OPUS_SET_PACKET_LOSS_PERC((fast_rand()&15)&(fast_rand()%15)))!=OPUS_OK)test_failed();