Add opus support.

This is David Richards' support patch for Ogg encapsulated
Opus streams.

From https://github.com/krad-radio/icecast-oneman/commit/35927ca52f8e538eb20d8a185b8c10f1f2e9118a

svn path=/icecast/branches/icecast-webm/; revision=18302

src/Makefile.am

@@ -10,14 +10,14 @@ noinst_HEADERS = admin.h cfgfile.h logging.h sighandler.h connection.h \
     global.h util.h slave.h source.h stats.h refbuf.h client.h \
     compat.h fserve.h xslt.h yp.h event.h md5.h \
     auth.h auth_htpasswd.h auth_url.h \
-    format.h format_ogg.h format_mp3.h format_ebml.h\
+    format.h format_ogg.h format_mp3.h format_ebml.h format_opus.h\
     format_vorbis.h format_theora.h format_flac.h format_speex.h format_midi.h \
     format_kate.h format_skeleton.h
 icecast_SOURCES = cfgfile.c main.c logging.c sighandler.c connection.c global.c \
     util.c slave.c source.c stats.c refbuf.c client.c \
     xslt.c fserve.c event.c admin.c md5.c \
     format.c format_ogg.c format_mp3.c format_midi.c format_flac.c format_ebml.c\
-    auth.c auth_htpasswd.c format_kate.c format_skeleton.c
+    auth.c auth_htpasswd.c format_kate.c format_skeleton.c format_opus.c
 EXTRA_icecast_SOURCES = yp.c \
     auth_url.c \
     format_vorbis.c format_theora.c format_speex.c

src/format_ogg.c

@@ -40,6 +40,7 @@
 #ifdef HAVE_SPEEX
 #include "format_speex.h"
 #endif
+#include "format_opus.h"
 #include "format_midi.h"
 #include "format_flac.h"
 #include "format_kate.h"
@@ -246,6 +247,9 @@ static int process_initial_page (format_plugin_t *plugin, ogg_page *page)
         if (codec)
             break;
         codec = initial_skeleton_page (plugin, page);
+        if (codec)
+            break;
+        codec = initial_opus_page (plugin, page);
         if (codec)
             break;
 

src/format_opus.c

+/* Icecast
+ *
+ *  This program is distributed under the GNU General Public License, version 2.
+ *  A copy of this license is included with this source.
+ *
+ * Copyright 2000-2004, Jack Moffitt <jack@xiph.org>,
+ *                      Michael Smith <msmith@xiph.org>,
+ *                      oddsock <oddsock@xiph.org>,
+ *                      Karl Heyes <karl@xiph.org>
+ *                      and others (see AUTHORS for details).
+ */
+
+
+/* Ogg codec handler for opus streams */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <ogg/ogg.h>
+
+typedef struct source_tag source_t;
+
+#include "format_opus.h"
+#include "refbuf.h"
+#include "client.h"
+
+#define CATMODULE "format-opus"
+#include "logging.h"
+
+static void opus_codec_free (ogg_state_t *ogg_info, ogg_codec_t *codec)
+{
+    ogg_stream_clear (&codec->os);
+    free (codec);
+}
+
+
+static refbuf_t *process_opus_page (ogg_state_t *ogg_info,
+        ogg_codec_t *codec, ogg_page *page)
+{
+    refbuf_t *refbuf;
+
+    if (codec->headers < 2)
+    {
+        ogg_packet packet;
+
+        ogg_stream_pagein (&codec->os, page);
+        while (ogg_stream_packetout (&codec->os, &packet) > 0)
+        {
+           /* first time around (normal case) yields comments */
+           codec->headers++;
+        }
+        /* add header page to associated list */
+        format_ogg_attach_header (ogg_info, page);
+        return NULL;
+    }
+    refbuf = make_refbuf_with_page (page);
+    return refbuf;
+}
+
+
+ogg_codec_t *initial_opus_page (format_plugin_t *plugin, ogg_page *page)
+{
+    ogg_state_t *ogg_info = plugin->_state;
+    ogg_codec_t *codec = calloc (1, sizeof (ogg_codec_t));
+    ogg_packet packet;
+
+    ogg_stream_init (&codec->os, ogg_page_serialno (page));
+    ogg_stream_pagein (&codec->os, page);
+
+    ogg_stream_packetout (&codec->os, &packet);
+
+    DEBUG0("checking for opus codec");
+    if (strncmp((char *)packet.packet, "OpusHead", 8) != 0)
+    {
+        ogg_stream_clear (&codec->os);
+        free (codec);
+        return NULL;
+    }
+    INFO0 ("seen initial opus header");
+    codec->process_page = process_opus_page;
+    codec->codec_free = opus_codec_free;
+    codec->headers = 1;
+    format_ogg_attach_header (ogg_info, page);
+    return codec;
+}
+

src/format_opus.h

+/* Icecast
+ *
+ * This program is distributed under the GNU General Public License, version 2.
+ * A copy of this license is included with this source.
+ *
+ * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
+ *                      Michael Smith <msmith@xiph.org>,
+ *                      oddsock <oddsock@xiph.org>,
+ *                      Karl Heyes <karl@xiph.org>
+ *                      and others (see AUTHORS for details).
+ */
+
+
+#ifndef __FORMAT_OPUS_H
+#define __FORMAT_OPUS_H
+
+#include "format_ogg.h"
+
+ogg_codec_t *initial_opus_page (format_plugin_t *plugin, ogg_page *page);
+
+#endif /* __FORMAT_OPUS_H */