--- /dev/null
+/*
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005-2012, Anthony Minessale II <anthm@freeswitch.org>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is
+ * Anthony Minessale II <anthm@freeswitch.org>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Brian K. West <brian@freeswitch.org>
+ *
+ * mod_b64.c -- The B64 ultra-low delay audio codec (http://www.b64-codec.org/)
+ *
+ */
+
+#include "switch.h"
+
+SWITCH_MODULE_LOAD_FUNCTION(mod_b64_load);
+SWITCH_MODULE_DEFINITION(mod_b64, mod_b64_load, NULL, NULL);
+
+#define HEADER "----Come to ClueCon Every August! "
+#define HLEN strlen(HEADER)
+
+static switch_status_t switch_codec_b64_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
+{
+ return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_codec_b64_destroy(switch_codec_t *codec)
+{
+
+ codec->private_info = NULL;
+ return SWITCH_STATUS_SUCCESS;
+}
+
+static int rot(char *p, char min, char max, int i)
+{
+ int r = 0;
+ int c;
+
+ if (*p >= min && *p <= max) {
+ if ((c = *p + i) <= max) {
+ *p = c;
+ } else {
+ *p = *p - i;
+ }
+ r++;
+ }
+
+ return r;
+}
+
+static void rot13_buffer(char *buf, size_t len)
+{
+ char *p = buf;
+ char *e = buf + len;
+
+ while(p < e) {
+ if (!rot(p, 'a', 'z', 13)) {
+ rot(p, 'A', 'Z', 13);
+ }
+ p++;
+ }
+}
+
+static switch_status_t switch_codec_b64_encode(switch_codec_t *codec,
+ switch_codec_t *other_codec,
+ void *decoded_data,
+ uint32_t decoded_data_len,
+ uint32_t decoded_rate, void *encoded_data, uint32_t *encoded_data_len, uint32_t *encoded_rate,
+ unsigned int *flag)
+{
+ char *p = encoded_data;
+ strncpy(p, HEADER, *encoded_data_len - HLEN);
+ p += HLEN;
+ encoded_data = p;
+ *encoded_data_len -= HLEN;
+
+ switch_b64_encode((unsigned char *) decoded_data, decoded_data_len, (unsigned char *) encoded_data, *encoded_data_len);
+ *encoded_data_len = strlen(encoded_data);
+ rot13_buffer(encoded_data, *encoded_data_len);
+ *encoded_data_len += HLEN;
+
+ return SWITCH_STATUS_SUCCESS;
+
+}
+
+static switch_status_t switch_codec_b64_decode(switch_codec_t *codec,
+ switch_codec_t *other_codec,
+ void *encoded_data,
+ uint32_t encoded_data_len,
+ uint32_t encoded_rate, void *decoded_data, uint32_t *decoded_data_len, uint32_t *decoded_rate,
+ unsigned int *flag)
+{
+
+ char *p = encoded_data;
+
+ if (strncmp(p, HEADER, HLEN)) {
+ switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "HEADER CHECK ERROR!");
+ return SWITCH_STATUS_FALSE;
+ }
+
+ p += HLEN;
+ encoded_data = p;
+ encoded_data_len -= HLEN;
+
+ rot13_buffer(encoded_data, encoded_data_len);
+ switch_b64_decode(encoded_data, decoded_data, *decoded_data_len);
+ *decoded_data_len = codec->implementation->decoded_bytes_per_packet;
+
+ return SWITCH_STATUS_SUCCESS;
+}
+
+SWITCH_MODULE_LOAD_FUNCTION(mod_b64_load)
+{
+ switch_codec_interface_t *codec_interface;
+ int samples = 160;
+ int bytes = 320;
+ int mss = 20000;
+ int x = 0;
+ int rate = 8000;
+ int bits = 171200;
+
+ /* connect my internal structure to the blank pointer passed to me */
+ *module_interface = switch_loadable_module_create_module_interface(pool, modname);
+
+ SWITCH_ADD_CODEC(codec_interface, "B64 (STANDARD)");
+
+ for (x = 0; x < 3; x++) {
+ switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
+ 116, /* the IANA code number */
+ "b64",/* the IANA code name */
+ NULL, /* default fmtp to send (can be overridden by the init function) */
+ rate, /* samples transferred per second */
+ rate, /* actual samples transferred per second */
+ bits, /* bits transferred per second */
+ mss, /* number of microseconds per frame */
+ samples, /* number of samples per frame */
+ bytes, /* number of bytes per frame decompressed */
+ 0, /* number of bytes per frame compressed */
+ 1, /* number of channels represented */
+ 1, /* number of frames per network packet */
+ switch_codec_b64_init, /* function to initialize a codec handle using this implementation */
+ switch_codec_b64_encode, /* function to encode raw data into encoded data */
+ switch_codec_b64_decode, /* function to decode encoded data into raw data */
+ switch_codec_b64_destroy); /* deinitalize a codec handle using this implementation */
+
+ bytes *= 2;
+ samples *= 2;
+ rate *= 2;
+ bits *= 2;
+
+ }
+
+ /* indicate that the module should continue to be loaded */
+ return SWITCH_STATUS_SUCCESS;
+}
+
+/* For Emacs:
+ * Local Variables:
+ * mode:c
+ * indent-tabs-mode:t
+ * tab-width:4
+ * c-basic-offset:4
+ * End:
+ * For VIM:
+ * vim:set softtabstop=4 shiftwidth=4 tabstop=4:
+ */
+
projects / thirdparty / freeswitch.git / commitdiff
