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Add some DRED decoding tests

--- a/tests/test_opus_encode.c

+++ b/tests/test_opus_encode.c

@@ -149,7 +149,15 @@

    opus_int16 *outbuf;

    int out_samples;

    int ret = 0;

-

+#ifdef ENABLE_DRED

+   OpusDREDDecoder *dred_dec;

+   OpusDRED *dred;

+   int dred_end;

+   int dred_amount;

+   int dred_ret;

+   dred_dec = opus_dred_decoder_create(&dred_ret);

+   dred = opus_dred_alloc(&dred_ret);

+#endif

    /* Generate input data */

    inbuf = (opus_int16*)malloc(sizeof(*inbuf)*SSAMPLES);

    generate_music(inbuf, SSAMPLES/2);

@@ -165,7 +173,22 @@

          ret = -1;

          break;

       }

-

+#ifdef ENABLE_DRED

+      dred_amount = opus_dred_parse(dred_dec, dred, packet, len, 48000, 48000, &dred_end, 0);

+      if(dred_amount<0) {

+         fprintf(stderr,"opus_dred_parse() returned %d\n",dred_amount);

+         ret = -1;

+         break;

+      }

+      if (dred_amount >= frame_size && (fast_rand()&1)) {

+         dred_ret = opus_decoder_dred_decode(dec, dred, frame_size, outbuf, frame_size);

+         if(dred_ret<0) {

+            fprintf(stderr,"opus_decoder_dred_decode() returned %d\n",dred_ret);

+            ret = -1;

+            break;

+         }

+      }

+#endif

       out_samples = opus_decode(dec, packet, len, outbuf, MAX_FRAME_SAMP, 0);

       if(out_samples!=frame_size) {

          fprintf(stderr,"opus_decode() returned %d\n",out_samples);

@@ -175,7 +198,10 @@

       samp_count += frame_size;

    } while (samp_count < ((SSAMPLES/2)-MAX_FRAME_SAMP));

-

+#ifdef ENABLE_DRED

+   opus_dred_decoder_destroy(dred_dec);

+   opus_dred_free(dred);

+#endif

    /* Clean up */

    free(inbuf);

    free(outbuf);

-- 

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