/* * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application * Copyright (C) 2005-2011, 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_opus.c -- The OPUS ultra-low delay audio codec (http://www.opus-codec.org/) * */ #include "switch.h" #include "opus.h" SWITCH_MODULE_LOAD_FUNCTION(mod_opus_load); SWITCH_MODULE_DEFINITION(mod_opus, mod_opus_load, NULL, NULL); struct opus_context { OpusEncoder *encoder_object; OpusDecoder *decoder_object; int frame_size; }; static switch_status_t switch_opus_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings) { struct opus_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; if (encoding) { /* come up with a way to specify these */ int bitrate_bps = codec->implementation->bits_per_second; int mode = MODE_HYBRID; int use_vbr = 1; int complexity = 10; int use_inbandfec = 1; int use_dtx = 1; int bandwidth = BANDWIDTH_FULLBAND; context->encoder_object = opus_encoder_create(codec->implementation->actual_samples_per_second, codec->implementation->number_of_channels); opus_encoder_ctl(context->encoder_object, OPUS_SET_MODE(mode)); opus_encoder_ctl(context->encoder_object, OPUS_SET_BITRATE(bitrate_bps)); opus_encoder_ctl(context->encoder_object, OPUS_SET_BANDWIDTH(bandwidth)); opus_encoder_ctl(context->encoder_object, OPUS_SET_VBR_FLAG(use_vbr)); opus_encoder_ctl(context->encoder_object, OPUS_SET_COMPLEXITY(complexity)); opus_encoder_ctl(context->encoder_object, OPUS_SET_INBAND_FEC_FLAG(use_inbandfec)); opus_encoder_ctl(context->encoder_object, OPUS_SET_DTX_FLAG(use_dtx)); } if (decoding) { context->decoder_object = opus_decoder_create(codec->implementation->actual_samples_per_second, codec->implementation->number_of_channels); } codec->private_info = context; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_opus_destroy(switch_codec_t *codec) { codec->private_info = NULL; return SWITCH_STATUS_SUCCESS; } static switch_status_t switch_opus_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 opus_context *context = codec->private_info; int bytes = 0; int len = (int) *encoded_data_len; if (!context) { return SWITCH_STATUS_FALSE; } if (len > 1275) len = 1275; bytes = opus_encode(context->encoder_object, (void *) decoded_data, decoded_data_len / 2, (unsigned char *) encoded_data, len); 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_opus_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 opus_context *context = codec->private_info; int samples = 0; if (!context) { return SWITCH_STATUS_FALSE; } samples = opus_decode(context->decoder_object, encoded_data, encoded_data_len, decoded_data, *decoded_data_len); if (samples < 0) { return SWITCH_STATUS_GENERR; } *decoded_data_len = samples * 2; return SWITCH_STATUS_SUCCESS; } SWITCH_MODULE_LOAD_FUNCTION(mod_opus_load) { switch_codec_interface_t *codec_interface; int samples = 80; int bytes = 960; int mss = 10000; int x = 0; int rate = 48000; int bits = 32000; /* 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, "OPUS (BETA 0.9.0)"); for (x = 0; x < 2; x++) { switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */ 115, /* the IANA code number */ "Opus-0.9.0",/* 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_opus_init, /* function to initialize a codec handle using this implementation */ switch_opus_encode, /* function to encode raw data into encoded data */ switch_opus_decode, /* function to decode encoded data into raw data */ switch_opus_destroy); /* deinitalize a codec handle using this implementation */ bytes *= 2; samples *= 2; mss *= 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: */