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Frame size optional, defaults to 20 ms

--- a/src/test_opus.c

+++ b/src/test_opus.c

@@ -46,12 +46,13 @@

 void print_usage( char* argv[] ) 

 {

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

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

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

     fprintf(stderr, "mode: 0 for SILK, 1 for hybrid, 2 for CELT:\n" );

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

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

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

+    fprintf(stderr, "-cbr                 : enable constant bitrate; default: VBR\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" );

@@ -105,9 +106,10 @@

    mode = atoi(argv[1]) + MODE_SILK_ONLY;

    sampling_rate = atoi(argv[2]);

    channels = atoi(argv[3]);

-   frame_size = atoi(argv[4]);

-   bitrate_bps = atoi(argv[5]);

+   bitrate_bps = atoi(argv[4]);

+   frame_size = sampling_rate/50;

+

    /* defaults: */

    use_vbr = 1;

    bandwidth=-1;

@@ -136,7 +138,7 @@

 	   bandwidth = BANDWIDTH_FULLBAND;

 	   break;

    }

-   args = 6;

+   args = 5;

    while( args < argc - 2 ) {

        /* process command line options */

         if( STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-cbr" ) == 0 ) {

@@ -158,6 +160,24 @@

                 return 1;

             }

             args += 2;

+        } else if( STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-framesize" ) == 0 ) {

+            if (strcmp(argv[ args + 1 ], "2.5")==0)

+                frame_size = sampling_rate/400;

+            else if (strcmp(argv[ args + 1 ], "5")==0)

+                frame_size = sampling_rate/400;

+            else if (strcmp(argv[ args + 1 ], "10")==0)

+                frame_size = sampling_rate/100;

+            else if (strcmp(argv[ args + 1 ], "20")==0)

+                frame_size = sampling_rate/50;

+            else if (strcmp(argv[ args + 1 ], "40")==0)

+                frame_size = sampling_rate/25;

+            else if (strcmp(argv[ args + 1 ], "60")==0)

+                frame_size = 3*sampling_rate/50;

+            else {

+                fprintf(stderr, "Unsupported frame size: %s ms. Supported are 2.5, 5, 10, 20, 40, 60.\n", argv[ args + 1 ]);

+                return 1;

+            }

+            args += 2;

         } else if( STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-max_payload" ) == 0 ) {

             max_payload_bytes = atoi( argv[ args + 1 ] );

             args += 2;

@@ -282,7 +302,7 @@

 	   bandwidth_string = "unknown";

    }

-   printf("Encoding %d Hz input at %.3f kb/s in %s mode.\n", sampling_rate, bitrate_bps*0.001, bandwidth_string);

+   printf("Encoding %d Hz input at %.3f kb/s in %s mode with %d-sample frames.\n", sampling_rate, bitrate_bps*0.001, bandwidth_string, frame_size);

    in = (short*)malloc(frame_size*channels*sizeof(short));

    out = (short*)malloc(frame_size*channels*sizeof(short));