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opusrtp: Allow an output filename for extraction

Closes https://github.com/xiph/opus-tools/pull/18
Signed-off-by: Mark Harris <[email protected]>

--- a/src/opusrtp.c

+++ b/src/opusrtp.c

@@ -796,7 +796,7 @@

   }

 }

-int extract(const char* input_file)

+int extract(const char* input_file, const char* output_file)

 {

   state *params;

   pcap_t *pcap;

@@ -830,7 +830,7 @@

     pcap_close(pcap);

     return -1;

   }

-  params->out = fopen("rtpdump.opus", "wb");

+  params->out = fopen(output_file, "wb");

   if (!params->out) {

     fprintf(stderr, "Couldn't open output file.\n");

     free(params->stream);

@@ -974,6 +974,7 @@

   const char *dest = "127.0.0.1";

 #ifdef HAVE_PCAP

   const char *input_pcap = NULL;

+  const char *output_file = "rtpdump.opus";

 #endif

   int port = 1234;

   struct option long_options[] = {

@@ -1051,8 +1052,16 @@

     }

   }

 #ifdef HAVE_PCAP

-  if(input_pcap) {

-    extract(input_pcap);

+  if (input_pcap) {

+     if (optind + 1 == argc) {

+       output_file = argv[optind];

+     }

+     else if (argc > optind + 1) {

+        fprintf(stderr,

+            "Please specify exactly one input PCAP file and one output file.\n");

+        return 1;

+    }

+    extract(input_pcap, output_file);

     return 0;

   }

 #endif