/* * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application * Copyright (C) 2005-2014, Anthony Minessale II * * 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 * Portions created by the Initial Developer are Copyright (C) * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Brian K. West * * mod_ilbc.c -- ilbc Codec Module * */ #include "switch.h" #include "ilbc.h" SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load); SWITCH_MODULE_DEFINITION(mod_ilbc, mod_ilbc_load, NULL, NULL); struct ilbc_context { ilbc_encode_state_t encoder_object; ilbc_decode_state_t decoder_object; }; static switch_status_t switch_ilbc_fmtp_parse(const char *fmtp, switch_codec_fmtp_t *codec_fmtp) { if (codec_fmtp) { char *mode = NULL; int codec_ms = 0; memset(codec_fmtp, '\0', sizeof(struct switch_codec_fmtp)); if (fmtp && (mode = strstr(fmtp, "mode=")) && (mode + 5)) { codec_ms = atoi(mode + 5); } if (!codec_ms) { /* default to 30 when no mode is defined for ilbc ONLY */ codec_ms = 30; } codec_fmtp->microseconds_per_packet = (codec_ms * 1000); return SWITCH_STATUS_SUCCESS; } return SWITCH_STATUS_FALSE; } static switch_status_t switch_ilbc_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings) { struct ilbc_context *context; int encoding = (flags & SWITCH_CODEC_FLAG_ENCODE); int decoding = (flags & SWITCH_CODEC_FLAG_DECODE); int mode = codec->implementation->microseconds_per_packet / 1000; if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) { return SWITCH_STATUS_FALSE; } codec->fmtp_out = switch_core_sprintf(codec->memory_pool, "mode=%d", mode); if (encoding) { ilbc_encode_init(&context->encoder_object, mode); } if (decoding) { ilbc_decode_init(&context->decoder_object, mode, 0); } codec->private_info = context; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_ilbc_destroy(switch_codec_t *codec) { codec->private_info = NULL; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_ilbc_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 ilbc_context *context = codec->private_info; if (!context) { return SWITCH_STATUS_FALSE; } *encoded_data_len = ilbc_encode(&context->encoder_object, (uint8_t *) encoded_data, (int16_t *) decoded_data, decoded_data_len / 2); return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_ilbc_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 ilbc_context *context = codec->private_info; if (!context) { return SWITCH_STATUS_FALSE; } *decoded_data_len = (2 * ilbc_decode(&context->decoder_object, (int16_t *) decoded_data, (uint8_t *) encoded_data, encoded_data_len)); return SWITCH_STATUS_SUCCESS; } SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load) { switch_codec_interface_t *codec_interface; /* 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, "iLBC"); codec_interface->parse_fmtp = switch_ilbc_fmtp_parse; switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */ 98, /* the IANA code number */ "iLBC", /* the IANA code name */ "mode=20", /* default fmtp to send (can be overridden by the init function) */ 8000, /* samples transferred per second */ 8000, /* actual samples transferred per second */ 15200, /* bits transferred per second */ 20000, /* number of microseconds per frame */ ILBC_BLOCK_LEN_20MS, /* number of samples per frame */ ILBC_BLOCK_LEN_20MS * 2, /* number of bytes per frame decompressed */ ILBC_NO_OF_BYTES_20MS, /* number of bytes per frame compressed */ 1, /* number of channels represented */ 1, /* number of frames per network packet */ switch_ilbc_init, /* function to initialize a codec handle using this implementation */ switch_ilbc_encode, /* function to encode raw data into encoded data */ switch_ilbc_decode, /* function to decode encoded data into raw data */ switch_ilbc_destroy); /* deinitalize a codec handle using this implementation */ switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */ 97, /* the IANA code number */ "iLBC", /* the IANA code name */ "mode=30", /* default fmtp to send (can be overridden by the init function) */ 8000, /* samples transferred per second */ 8000, /* actual samples transferred per second */ 13330, /* bits transferred per second */ 30000, /* number of microseconds per frame */ ILBC_BLOCK_LEN_30MS, /* number of samples per frame */ ILBC_BLOCK_LEN_30MS * 2, /* number of bytes per frame decompressed */ ILBC_NO_OF_BYTES_30MS, /* number of bytes per frame compressed */ 1, /* number of channels represented */ 1, /* number of frames per network packet */ switch_ilbc_init, /* function to initialize a codec handle using this implementation */ switch_ilbc_encode, /* function to encode raw data into encoded data */ switch_ilbc_decode, /* function to decode encoded data into raw data */ switch_ilbc_destroy); /* deinitalize a codec handle using this implementation */ /* 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 noet: */