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Making sure the decoder always outputs at least 2.5 ms

--- a/src/opus_decoder.c

+++ b/src/opus_decoder.c

@@ -103,6 +103,7 @@

     celt_decoder_ctl(celt_dec, CELT_SET_SIGNALLING(0));

 	st->prev_mode = 0;

+	st->frame_size = Fs/400;

 	return st;

 failure:

     free(st);

@@ -179,6 +180,8 @@

     F10 = F20>>1;

     F5 = F10>>1;

     F2_5 = F5>>1;

+    if (frame_size < F2_5)

+       return OPUS_BUFFER_TOO_SMALL;

     /* Payloads of 1 (2 including ToC) or 0 trigger the PLC/DTX */

     if (len<=1)

     {

@@ -194,6 +197,7 @@

         ec_dec_init(&dec,(unsigned char*)data,len);

     } else {

     	audiosize = frame_size;

+

     	if (st->prev_mode == 0)

     	{

     		/* If we haven't got any packet yet, all we can do is return zeros */