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Making the encoder more robust against extreme bitrate requests

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -848,6 +848,8 @@

     if (st->mode != MODE_SILK_ONLY)

     {

         ret = celt_encode_with_ec(celt_enc, pcm_buf, frame_size, NULL, nb_compr_bytes, &enc);

+        if (ret < 0)

+           return OPUS_INTERNAL_ERROR;

     }

     /* 5 ms redundant frame for SILK->CELT */

@@ -958,6 +960,8 @@

                     goto bad_arg;

                 else if (value <= 500)

                     value = 500;

+                else if (value > (opus_int32)300000*st->channels)

+                    value = (opus_int32)300000*st->channels;

             }

             st->user_bitrate_bps = value;

         }