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Adds -random_framesize and -sweep_max options to opus_demo

Undocumented for now.

--- a/src/opus_demo.c

+++ b/src/opus_demo.c

@@ -37,6 +37,7 @@

 #include "opus.h"

 #include "debug.h"

 #include "opus_types.h"

+#include "opus_private.h"

 #define MAX_PACKET 1500

@@ -139,6 +140,8 @@

     int max_frame_size = 960*6;

     int curr_read=0;

     int sweep_bps = 0;

+    int random_framesize=0, newsize=0, delayed_celt=0;

+    int sweep_max=0, sweep_min=0;

     if (argc < 5 )

     {

@@ -286,6 +289,14 @@

             check_encoder_option(decode_only, "-sweep");

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

             args += 2;

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

+            check_encoder_option(decode_only, "-random_framesize");

+            random_framesize = 1;

+            args++;

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

+            check_encoder_option(decode_only, "-sweep_max");

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

+            args += 2;

         } else {

             printf( "Error: unrecognized setting: %s\n\n", argv[ args ] );

             print_usage( argv );

@@ -293,6 +304,9 @@

         }

     }

+    if (sweep_max)

+       sweep_min = bitrate_bps;

+

     if (max_payload_bytes < 0 || max_payload_bytes > MAX_PACKET)

     {

         fprintf (stderr, "max_payload_bytes must be between 0 and %d\n",

@@ -385,7 +399,7 @@

                        (long)sampling_rate, bitrate_bps*0.001,

                        bandwidth_string, frame_size);

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

+    in = (short*)malloc(max_frame_size*channels*sizeof(short));

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

     data[0] = (unsigned char*)calloc(max_payload_bytes,sizeof(char));

     if ( use_inbandfec ) {

@@ -393,6 +407,30 @@

     }

     while (!stop)

     {

+        if (delayed_celt)

+        {

+            frame_size = newsize;

+            delayed_celt = 0;

+        } else if (random_framesize && rand()%20==0)

+        {

+            newsize = rand()%6;

+            switch(newsize)

+            {

+            case 0: newsize=sampling_rate/400; break;

+            case 1: newsize=sampling_rate/200; break;

+            case 2: newsize=sampling_rate/100; break;

+            case 3: newsize=sampling_rate/50; break;

+            case 4: newsize=sampling_rate/25; break;

+            case 5: newsize=3*sampling_rate/50; break;

+            }

+            if (newsize < sampling_rate/100 && frame_size >= sampling_rate/100)

+            {

+                opus_encoder_ctl(enc, OPUS_SET_FORCE_MODE(MODE_CELT_ONLY));

+                delayed_celt=1;

+            } else {

+                frame_size = newsize;

+            }

+        }

         if (decode_only)

         {

             unsigned char ch[4];

@@ -430,6 +468,13 @@

             if (sweep_bps!=0)

             {

                bitrate_bps += sweep_bps;

+               if (sweep_max)

+               {

+                  if (bitrate_bps > sweep_max)

+                     sweep_bps = -sweep_bps;

+                  else if (bitrate_bps < sweep_min)

+                     sweep_bps = -sweep_bps;

+               }

                /* safety */

                if (bitrate_bps<1000)

                   bitrate_bps = 1000;