--- /dev/null
+/*
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
+ *
+ * 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 <anthmct@yahoo.com>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Anthony Minessale II <anthmct@yahoo.com>
+ * Brian K. West <brian.west@mac.com>
+ *
+ * mod_amr.c -- GSM-AMR Codec Module
+ *
+ */
+#include "switch.h"
+#include "amr.h"
+
+static const char modname[] = "mod_amr";
+
+struct amr_context {
+ void *encoder_state;
+ int mode;
+};
+
+enum
+ {
+ GENERIC_PARAMETER_AMR_MAXAL_SDUFRAMES = 0,
+ GENERIC_PARAMETER_AMR_BITRATE,
+ GENERIC_PARAMETER_AMR_GSMAMRCOMFORTNOISE,
+ GENERIC_PARAMETER_AMR_GSMEFRCOMFORTNOISE,
+ GENERIC_PARAMETER_AMR_IS_641COMFORTNOISE,
+ GENERIC_PARAMETER_AMR_PDCEFRCOMFORTNOISE
+ };
+
+enum
+ {
+ AMR_BITRATE_475 = 0,
+ AMR_BITRATE_515,
+ AMR_BITRATE_590,
+ AMR_BITRATE_670,
+ AMR_BITRATE_740,
+ AMR_BITRATE_795,
+ AMR_BITRATE_1020,
+ AMR_BITRATE_1220
+ };
+
+//static short bytes_per_frame[16]={ 13, 14, 16, 18, 19, 21, 26, 31, 6, 0, 0, 0, 0, 0, 0, 0 };
+
+#define AMR_Mode 7
+
+static switch_status_t switch_amr_init(switch_codec_t *codec, switch_codec_flag_t flags,
+ const switch_codec_settings_t *codec_settings)
+{
+ struct amr_context *context = NULL;
+ int encoding, decoding;
+
+ encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
+ decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
+
+ if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct amr_context))))) {
+ return SWITCH_STATUS_FALSE;
+ } else {
+
+ context->mode = AMR_Mode;
+
+ if (encoding) {
+ context->encoder_state = Encoder_Interface_init(0);
+ }
+
+ if (decoding) {
+ Decoder_Interface_init();
+ }
+
+ codec->private_info = context;
+
+ return SWITCH_STATUS_SUCCESS;
+ }
+}
+
+static switch_status_t switch_amr_destroy(switch_codec_t *codec)
+{
+ struct amr_context *context = codec->private_info;
+ Encoder_Interface_exit(context->encoder_state);
+ Decoder_Interface_exit(context->encoder_state);
+ codec->private_info = NULL;
+ return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_amr_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)
+{
+ struct amr_context *context = codec->private_info;
+
+ if (!context) {
+ return SWITCH_STATUS_FALSE;
+ }
+
+ *encoded_data_len = Encoder_Interface_Encode(context->encoder_state, context->mode, (void *)decoded_data, encoded_data, 0);
+
+ return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_amr_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)
+{
+ struct amr_context *context = codec->private_info;
+
+ context->mode = *(char *)encoded_data & 0xF;
+
+ if (!context) {
+ return SWITCH_STATUS_FALSE;
+ }
+
+ Decoder_Interface_Decode( context, (void *)encoded_data, (void *)decoded_data, 0 );
+
+ *decoded_data_len = codec->implementation->samples_per_frame;
+
+ return SWITCH_STATUS_SUCCESS;
+}
+
+/* Registration */
+
+static const switch_codec_implementation_t amr_implementation = {
+ /*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
+ /*.ianacode */ 118,
+ /*.iananame */ "AMR",
+ /*.samples_per_second */ 8000,
+ /*.bits_per_second */ 0,
+ /*.microseconds_per_frame */ 20000,
+ /*.samples_per_frame */ 160,
+ /*.bytes_per_frame */ 0,
+ /*.encoded_bytes_per_frame */ 0,
+ /*.number_of_channels */ 1,
+ /*.pref_frames_per_packet */ 1,
+ /*.max_frames_per_packet */ 1,
+ /*.init */ switch_amr_init,
+ /*.encode */ switch_amr_encode,
+ /*.decode */ switch_amr_decode,
+ /*.destroy */ switch_amr_destroy,
+};
+
+static const switch_codec_interface_t amr_codec_interface = {
+ /*.interface_name */ "GSM-AMR",
+ /*.implementations */ &amr_implementation,
+};
+
+static switch_loadable_module_interface_t amr_module_interface = {
+ /*.module_name */ modname,
+ /*.endpoint_interface */ NULL,
+ /*.timer_interface */ NULL,
+ /*.dialplan_interface */ NULL,
+ /*.codec_interface */ &amr_codec_interface,
+ /*.application_interface */ NULL
+};
+
+SWITCH_MOD_DECLARE(switch_status_t) switch_module_load(const switch_loadable_module_interface_t **module_interface,
+ char *filename)
+{
+ /* connect my internal structure to the blank pointer passed to me */
+ *module_interface = &amr_module_interface;
+
+ /* indicate that the module should continue to be loaded */
+ return SWITCH_STATUS_SUCCESS;
+}
projects / thirdparty / freeswitch.git / commitdiff
