/* * 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_celt.c -- The CELT ultra-low delay audio codec (http://www.celt-codec.org/) * */ #include "switch.h" #include "celt.h" SWITCH_MODULE_LOAD_FUNCTION(mod_celt_load); SWITCH_MODULE_DEFINITION(mod_celt, mod_celt_load, NULL, NULL); struct celt_context { CELTEncoder *encoder_object; CELTDecoder *decoder_object; CELTMode *mode_object; int frame_size; int bytes_per_packet; }; static switch_status_t switch_celt_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings) { struct celt_context *context = NULL; int encoding = (flags & SWITCH_CODEC_FLAG_ENCODE); int decoding = (flags & SWITCH_CODEC_FLAG_DECODE); if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) { return SWITCH_STATUS_FALSE; } context->frame_size = codec->implementation->samples_per_packet; context->mode_object = celt_mode_create(codec->implementation->actual_samples_per_second, context->frame_size, NULL); context->bytes_per_packet = (codec->implementation->bits_per_second * context->frame_size / codec->implementation->actual_samples_per_second + 4) / 8; /* if (codec->fmtp_in) { int x, argc; char *argv[10]; argc = switch_separate_string(codec->fmtp_in, ';', argv, (sizeof(argv) / sizeof(argv[0]))); for (x = 0; x < argc; x++) { char *data = argv[x]; char *arg; switch_assert(data); while (*data == ' ') { data++; } if ((arg = strchr(data, '='))) { *arg++ = '\0'; if (!strcasecmp(data, "bitrate")) { bit_rate = atoi(arg); } } } } codec->fmtp_out = switch_core_sprintf(codec->memory_pool, "bitrate=%d", bit_rate); */ if (encoding) { context->encoder_object = celt_encoder_create(context->mode_object, 1, NULL); } if (decoding) { context->decoder_object = celt_decoder_create(context->mode_object, 1, NULL); } codec->private_info = context; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_celt_destroy(switch_codec_t *codec) { codec->private_info = NULL; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_celt_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 celt_context *context = codec->private_info; int bytes = 0; if (!context) { return SWITCH_STATUS_FALSE; } bytes = (uint32_t) celt_encode(context->encoder_object, (void *) decoded_data, codec->implementation->samples_per_packet, (unsigned char *) encoded_data, context->bytes_per_packet); if (bytes > 0) { *encoded_data_len = (uint32_t) bytes; return SWITCH_STATUS_SUCCESS; } switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Encoder Error!\n"); return SWITCH_STATUS_GENERR; } static switch_status_t switch_celt_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 celt_context *context = codec->private_info; if (!context) { return SWITCH_STATUS_FALSE; } if (celt_decode(context->decoder_object, encoded_data, encoded_data_len, decoded_data, codec->implementation->samples_per_packet)) { return SWITCH_STATUS_GENERR; } *decoded_data_len = codec->implementation->decoded_bytes_per_packet; return SWITCH_STATUS_SUCCESS; } SWITCH_MODULE_LOAD_FUNCTION(mod_celt_load) { switch_codec_interface_t *codec_interface; int bytes_per_frame; int samples_per_frame; int ms_per_frame; int x; /* 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, "CELT ultra-low delay"); ms_per_frame = 2000; samples_per_frame = 96; bytes_per_frame = 192; for (x = 0; x < 5; x++) { switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */ 114, /* the IANA code number */ "CELT", /* the IANA code name */ NULL, /* default fmtp to send (can be overridden by the init function) */ 48000, /* samples transferred per second */ 48000, /* actual samples transferred per second */ 48000, /* bits transferred per second */ ms_per_frame, /* number of microseconds per frame */ samples_per_frame, /* number of samples per frame */ bytes_per_frame, /* 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_celt_init, /* function to initialize a codec handle using this implementation */ switch_celt_encode, /* function to encode raw data into encoded data */ switch_celt_decode, /* function to decode encoded data into raw data */ switch_celt_destroy); /* deinitalize a codec handle using this implementation */ ms_per_frame += 2000; samples_per_frame += 96; bytes_per_frame += 192; } /* 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: */