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Add more standard tag switches to opusenc.

This adds --album, --date, and --genre to opusenc, to simplify
adding these common tags. This now matches the subset oggenc
offers direct command line switches for.

--- a/man/opusenc.1

+++ b/man/opusenc.1

@@ -54,8 +54,17 @@

 .I author

 ] [

 .B --title

-.I track title

+.I 'track title'

 ] [

+.B --album

+.I 'album title'

+] [

+.B --date

+.I YYYY-MM-DD

+] [

+.B --genre

+.I genre

+] [

 .B --raw

 ] [

 .B --raw-bits

@@ -137,11 +146,20 @@

 See the vorbis-comment specification for well known tag names:

 http://www.xiph.org/vorbis/doc/v-comment.html

 .IP "--artist artist"

-Set the artist comment field in the comments to

+Set the artist comment field to

 .I artist

 .IP "--title title"

 Set the track title comment field to

 .I title

+.IP "--album album"

+Set the album or collection title field to

+.I album

+.IP "--date YYYY-MM-DD"

+Set the date comment field to

+.I YYYY-MM-DD

+.IP "--genre genre"

+Set the genre comment field to

+.I genre

 .IP "--raw"

 Raw (headerless) PCM input

 .IP "--raw-bits N"

--- a/src/opusenc.c

+++ b/src/opusenc.c

@@ -151,6 +151,9 @@

   printf("                      This may be used multiple times\n");

   printf(" --artist           Author of this track\n");

   printf(" --title            Title for this track\n");

+  printf(" --album            Album or collection this track belongs to\n");

+  printf(" --date             Date for this track\n");

+  printf(" --genre            Genre for this track\n");

   printf("\nInput options:\n");

   printf(" --raw              Raw input\n");

   printf(" --raw-bits n       Set bits/sample for raw input (default: 16)\n");

@@ -210,6 +213,9 @@

     {"comment", required_argument, NULL, 0},

     {"artist", required_argument, NULL, 0},

     {"title", required_argument, NULL, 0},

+    {"album", required_argument, NULL, 0},

+    {"date", required_argument, NULL, 0},

+    {"genre", required_argument, NULL, 0},

     {"discard-comments", no_argument, NULL, 0},

     {0, 0, 0, 0}

   };

@@ -472,6 +478,12 @@

         } else if(strcmp(long_options[option_index].name,"title")==0){

           save_cmd=0;

           comment_add(&inopt.comments, &inopt.comments_length, "title", optarg);

+        } else if(strcmp(long_options[option_index].name,"album")==0){

+          comment_add(&inopt.comments, &inopt.comments_length, "album", optarg);

+        } else if(strcmp(long_options[option_index].name,"date")==0){

+          comment_add(&inopt.comments, &inopt.comments_length, "date", optarg);

+        } else if(strcmp(long_options[option_index].name,"genre")==0){

+          comment_add(&inopt.comments, &inopt.comments_length, "genre", optarg);

         } else if(strcmp(long_options[option_index].name,"discard-comments")==0){

           inopt.copy_comments=0;

         }