1 files changed, 139 insertions, 0 deletions
diff --git a/kaffeine/src/input/dvb/lib/libdvben50221/en50221_app_teletext.c b/kaffeine/src/input/dvb/lib/libdvben50221/en50221_app_teletext.c
new file mode 100644
index 0000000..cc2ee41
--- /dev/null
+++ b/kaffeine/src/input/dvb/lib/libdvben50221/en50221_app_teletext.c
@@ -0,0 +1,139 @@
+/*
+    en50221 encoder An implementation for libdvb
+    an implementation for the en50221 transport layer
+
+    Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.com)
+    Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
+    Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation; either version 2.1 of
+    the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+*/
+
+#include <string.h>
+#include <libdvbmisc/dvbmisc.h>
+#include <pthread.h>
+#include "en50221_app_teletext.h"
+#include "en50221_app_tags.h"
+#include "asn_1.h"
+
+struct en50221_app_teletext_private {
+        struct en50221_app_send_functions *funcs;
+
+        en50221_app_teletext_callback callback;
+        void *callback_arg;
+
+        pthread_mutex_t lock;
+};
+
+static int en50221_app_teletext_parse_ebu(struct en50221_app_teletext_private *private,
+                                           uint8_t slot_id, uint16_t session_number,
+                                           uint8_t *data, uint32_t data_length);
+
+
+
+en50221_app_teletext en50221_app_teletext_create(struct en50221_app_send_functions *funcs)
+{
+    struct en50221_app_teletext_private *private = NULL;
+
+    // create structure and set it up
+    private = malloc(sizeof(struct en50221_app_teletext_private));
+    if (private == NULL) {
+        return NULL;
+    }
+    private->funcs = funcs;
+    private->callback = NULL;
+
+    pthread_mutex_init(&private->lock, NULL);
+
+    // done
+    return private;
+}
+
+void en50221_app_teletext_destroy(en50221_app_teletext teletext)
+{
+    struct en50221_app_teletext_private *private = (struct en50221_app_teletext_private *) teletext;
+
+    pthread_mutex_destroy(&private->lock);
+    free(private);
+}
+
+void en50221_app_teletext_register_callback(en50221_app_teletext teletext,
+                                            en50221_app_teletext_callback callback, void *arg)
+{
+    struct en50221_app_teletext_private *private = (struct en50221_app_teletext_private *) teletext;
+
+    pthread_mutex_lock(&private->lock);
+    private->callback = callback;
+    private->callback_arg = arg;
+    pthread_mutex_unlock(&private->lock);
+}
+
+int en50221_app_teletext_message(en50221_app_teletext teletext,
+                                 uint8_t slot_id,
+                                 uint16_t session_number,
+                                 uint32_t resource_id,
+                                 uint8_t *data, uint32_t data_length)
+{
+    struct en50221_app_teletext_private *private = (struct en50221_app_teletext_private *) teletext;
+    (void) resource_id;
+
+    // get the tag
+    if (data_length < 3) {
+        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+        return -1;
+    }
+    uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+
+    switch(tag)
+    {
+        case TAG_TELETEXT_EBU:
+            return en50221_app_teletext_parse_ebu(private, slot_id, session_number, data+3, data_length-3);
+    }
+
+    print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
+    return -1;
+}
+
+
+static int en50221_app_teletext_parse_ebu(struct en50221_app_teletext_private *private,
+                                           uint8_t slot_id, uint16_t session_number,
+                                           uint8_t *data, uint32_t data_length)
+{
+    // first of all, decode the length field
+    uint16_t asn_data_length;
+    int length_field_len;
+    if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+        print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+        return -1;
+    }
+
+    // check it
+    if (asn_data_length > (data_length-length_field_len)) {
+        print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+        return -1;
+    }
+    uint8_t *teletext_data = data + length_field_len;
+
+    // tell the app
+    pthread_mutex_lock(&private->lock);
+    en50221_app_teletext_callback cb = private->callback;
+    void *cb_arg = private->callback_arg;
+    pthread_mutex_unlock(&private->lock);
+    if (cb) {
+        return cb(cb_arg, slot_id, session_number, teletext_data, asn_data_length);
+    }
+    return 0;
+}
+