/* * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application * Copyright (C) 2005/2006, 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): * * Anthony Minessale II * Michael Jerris * * mod_ilbc.c -- ilbc Codec Module * */ #include "switch.h" #include "iLBC_encode.h" #include "iLBC_decode.h" #include "iLBC_define.h" static const char modname[] = "mod_ilbc"; struct ilbc_context { iLBC_Enc_Inst_t encoder; iLBC_Dec_Inst_t decoder; uint8_t ms; uint16_t bytes; uint16_t dbytes; }; static switch_status switch_ilbc_init(switch_codec *codec, switch_codec_flag flags, const struct switch_codec_settings *codec_settings) { struct ilbc_context *context; int encoding, decoding; uint8_t ms = codec->implementation->microseconds_per_frame / 1000; if (ms != 20 && ms != 30) { switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "invalid speed! (I should never happen)\n"); return SWITCH_STATUS_FALSE; } encoding = (flags & SWITCH_CODEC_FLAG_ENCODE); decoding = (flags & SWITCH_CODEC_FLAG_DECODE); if (!(encoding || decoding)) { return SWITCH_STATUS_FALSE; } else { context = switch_core_alloc(codec->memory_pool, sizeof(*context)); context->ms = ms; if (context->ms == 20) { context->bytes = NO_OF_BYTES_20MS; context->dbytes = 320; } else { context->bytes = NO_OF_BYTES_30MS; context->dbytes = 480; } if (encoding) { initEncode(&context->encoder, context->ms); } if (decoding) { initDecode(&context->decoder, context->ms, 1); } } codec->private_info = context; return SWITCH_STATUS_SUCCESS; } static switch_status switch_ilbc_destroy(switch_codec *codec) { codec->private_info = NULL; return SWITCH_STATUS_SUCCESS; } static switch_status switch_ilbc_encode(switch_codec *codec, switch_codec *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; } if (decoded_data_len % context->dbytes == 0) { unsigned int new_len = 0; unsigned char *edp = encoded_data; short *ddp = decoded_data; int x, y; int loops = (int) decoded_data_len / context->dbytes; float buf[240]; for (x = 0; x < loops && new_len < *encoded_data_len; x++) { for(y = 0; y < context->dbytes / sizeof(short) ; y++) { buf[y] = ddp[y]; } iLBC_encode(edp, buf, &context->encoder); edp += context->bytes; ddp += context->dbytes; new_len += context->bytes; } if (new_len <= *encoded_data_len) { *encoded_data_len = new_len; } else { switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "buffer overflow!!! %u >= %u\n", new_len, *encoded_data_len); return SWITCH_STATUS_FALSE; } } return SWITCH_STATUS_SUCCESS; } static switch_status switch_ilbc_decode(switch_codec *codec, switch_codec *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; } if (encoded_data_len % context->bytes == 0) { int loops = (int) encoded_data_len / context->bytes; unsigned char *edp = encoded_data; short *ddp = decoded_data; int x,y; unsigned int new_len = 0; float buf[240]; for (x = 0; x < loops && new_len < *decoded_data_len; x++) { iLBC_decode(buf, edp, &context->decoder, 1); for(y = 0; y < context->dbytes / sizeof(short) ; y++) { ddp[y] = buf[y]; } ddp += context->dbytes / sizeof(short); edp += context->bytes; new_len += context->dbytes; } if (new_len <= *decoded_data_len) { *decoded_data_len = new_len; } else { switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "buffer overflow!!!\n"); return SWITCH_STATUS_FALSE; } } else { switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "yo this frame is an odd size [%d]\n", encoded_data_len); } return SWITCH_STATUS_SUCCESS; } /* Registration */ static const switch_codec_implementation ilbc_8k_30ms_implementation = { /*.samples_per_second */ 8000, /*.bits_per_second */ NO_OF_BYTES_30MS*8*8000/BLOCKL_30MS, /*.microseconds_per_frame */ 30000, /*.samples_per_frame */ 240, /*.bytes_per_frame */ 480, /*.encoded_bytes_per_frame */ NO_OF_BYTES_30MS, /*.number_of_channels */ 1, /*.pref_frames_per_packet */ 1, /*.max_frames_per_packet */ 1, /*.init */ switch_ilbc_init, /*.encode */ switch_ilbc_encode, /*.decode */ switch_ilbc_decode, /*.destroy */ switch_ilbc_destroy }; static const switch_codec_implementation ilbc_8k_20ms_implementation = { /*.samples_per_second */ 8000, /*.bits_per_second */ NO_OF_BYTES_20MS*8*8000/BLOCKL_20MS, /*.microseconds_per_frame */ 20000, /*.samples_per_frame */ 160, /*.bytes_per_frame */ 320, /*.encoded_bytes_per_frame */ NO_OF_BYTES_20MS, /*.number_of_channels */ 1, /*.pref_frames_per_packet */ 1, /*.max_frames_per_packet */ 1, /*.init */ switch_ilbc_init, /*.encode */ switch_ilbc_encode, /*.decode */ switch_ilbc_decode, /*.destroy */ switch_ilbc_destroy, /*.next */ &ilbc_8k_30ms_implementation }; static const switch_codec_interface ilbc_codec_interface = { /*.interface_name */ "ilbc", /*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, /*.ianacode */ 97, /*.iananame */ "iLBC", /*.implementations */ &ilbc_8k_20ms_implementation, }; static switch_loadable_module_interface ilbc_module_interface = { /*.module_name */ modname, /*.endpoint_interface */ NULL, /*.timer_interface */ NULL, /*.dialplan_interface */ NULL, /*.codec_interface */ &ilbc_codec_interface, /*.application_interface */ NULL }; SWITCH_MOD_DECLARE(switch_status) switch_module_load(const switch_loadable_module_interface **interface, char *filename) { /* connect my internal structure to the blank pointer passed to me */ *interface = &ilbc_module_interface; /* indicate that the module should continue to be loaded */ return SWITCH_STATUS_SUCCESS; }