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test_opus usage for -e/-d

--- a/src/test_opus.c

+++ b/src/test_opus.c

@@ -42,14 +42,16 @@

 void print_usage( char* argv[] ) 

 {

-    fprintf(stderr, "Usage: %s <application (0/1)> <sampling rate (Hz)> <channels (1/2)> "

+    fprintf(stderr, "Usage: %s [-e | -d] <application (0/1)> <sampling rate (Hz)> <channels (1/2)> "

         "<bits per second>  [options] <input> <output>\n\n", argv[0]);

     fprintf(stderr, "mode: 0 for VoIP, 1 for audio:\n" );

     fprintf(stderr, "options:\n" );

+    fprintf(stderr, "-e                   : only runs the encoder (output the bit-stream)\n" );

+    fprintf(stderr, "-d                   : only runs the decoder (reads the bit-stream as input)\n" );

     fprintf(stderr, "-cbr                 : enable constant bitrate; default: variable bitrate\n" );

     fprintf(stderr, "-cvbr                : enable constraint variable bitrate; default: unconstraint\n" );

-    fprintf(stderr, "-bandwidth <NB|MB|WB|SWB|FB>  : audio bandwidth (from narrowband to fullband); default: sampling rate\n" );

-    fprintf(stderr, "-framesize <2.5|5|10|20|40|60>  : frame size in ms; default: 20 \n" );

+    fprintf(stderr, "-bandwidth <NB|MB|WB|SWB|FB> : audio bandwidth (from narrowband to fullband); default: sampling rate\n" );

+    fprintf(stderr, "-framesize <2.5|5|10|20|40|60> : frame size in ms; default: 20 \n" );

     fprintf(stderr, "-max_payload <bytes> : maximum payload size in bytes, default: 1024\n" );

     fprintf(stderr, "-complexity <comp>   : complexity, 0 (lowest) ... 10 (highest); default: 10\n" );

     fprintf(stderr, "-inbandfec           : enable SILK inband FEC\n" );