192 lines
6.9 KiB
C
192 lines
6.9 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
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*
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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*
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* The Initial Developer of the Original Code is
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* Anthony Minessale II <anthm@freeswitch.org>
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* Portions created by the Initial Developer are Copyright (C)
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Brian K. West <brian@freeswitch.org>
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*
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* mod_ilbc.c -- ilbc Codec Module
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*
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*/
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#include "switch.h"
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#include "ilbc.h"
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SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load);
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SWITCH_MODULE_DEFINITION(mod_ilbc, mod_ilbc_load, NULL, NULL);
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struct ilbc_context {
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ilbc_encode_state_t encoder_object;
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ilbc_decode_state_t decoder_object;
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};
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static switch_status_t switch_ilbc_fmtp_parse(const char *fmtp, switch_codec_fmtp_t *codec_fmtp)
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{
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if (codec_fmtp) {
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char *mode = NULL;
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int codec_ms = 0;
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memset(codec_fmtp, '\0', sizeof(struct switch_codec_fmtp));
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if (fmtp && (mode = strstr(fmtp, "mode=")) && (mode + 5)) {
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codec_ms = atoi(mode + 5);
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}
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if (!codec_ms) {
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/* default to 30 when no mode is defined for ilbc ONLY */
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codec_ms = 30;
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}
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codec_fmtp->microseconds_per_packet = (codec_ms * 1000);
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return SWITCH_STATUS_SUCCESS;
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}
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return SWITCH_STATUS_FALSE;
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}
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static switch_status_t switch_ilbc_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
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{
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struct ilbc_context *context;
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int encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
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int decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
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int mode = codec->implementation->microseconds_per_packet / 1000;
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if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) {
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return SWITCH_STATUS_FALSE;
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}
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codec->fmtp_out = switch_core_sprintf(codec->memory_pool, "mode=%d", mode);
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if (encoding) {
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ilbc_encode_init(&context->encoder_object, mode);
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}
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if (decoding) {
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ilbc_decode_init(&context->decoder_object, mode, 0);
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}
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codec->private_info = context;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_ilbc_destroy(switch_codec_t *codec)
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{
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codec->private_info = NULL;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_ilbc_encode(switch_codec_t *codec,
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switch_codec_t *other_codec,
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void *decoded_data,
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uint32_t decoded_data_len,
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uint32_t decoded_rate, void *encoded_data, uint32_t *encoded_data_len, uint32_t *encoded_rate,
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unsigned int *flag)
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{
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struct ilbc_context *context = codec->private_info;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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*encoded_data_len = ilbc_encode(&context->encoder_object, (uint8_t *) encoded_data, (int16_t *) decoded_data, decoded_data_len / 2);
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_ilbc_decode(switch_codec_t *codec,
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switch_codec_t *other_codec,
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void *encoded_data,
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uint32_t encoded_data_len,
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uint32_t encoded_rate, void *decoded_data, uint32_t *decoded_data_len, uint32_t *decoded_rate,
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unsigned int *flag)
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{
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struct ilbc_context *context = codec->private_info;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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*decoded_data_len = (2 * ilbc_decode(&context->decoder_object, (int16_t *) decoded_data, (uint8_t *) encoded_data, encoded_data_len));
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return SWITCH_STATUS_SUCCESS;
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}
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SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load)
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{
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switch_codec_interface_t *codec_interface;
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/* connect my internal structure to the blank pointer passed to me */
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*module_interface = switch_loadable_module_create_module_interface(pool, modname);
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SWITCH_ADD_CODEC(codec_interface, "iLBC");
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codec_interface->parse_fmtp = switch_ilbc_fmtp_parse;
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switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
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98, /* the IANA code number */
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"iLBC", /* the IANA code name */
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"mode=20", /* default fmtp to send (can be overridden by the init function) */
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8000, /* samples transferred per second */
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8000, /* actual samples transferred per second */
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15200, /* bits transferred per second */
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20000, /* number of microseconds per frame */
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ILBC_BLOCK_LEN_20MS, /* number of samples per frame */
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ILBC_BLOCK_LEN_20MS * 2, /* number of bytes per frame decompressed */
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ILBC_NO_OF_BYTES_20MS, /* number of bytes per frame compressed */
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1, /* number of channels represented */
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1, /* number of frames per network packet */
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switch_ilbc_init, /* function to initialize a codec handle using this implementation */
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switch_ilbc_encode, /* function to encode raw data into encoded data */
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switch_ilbc_decode, /* function to decode encoded data into raw data */
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switch_ilbc_destroy); /* deinitalize a codec handle using this implementation */
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switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
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97, /* the IANA code number */
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"iLBC", /* the IANA code name */
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"mode=30", /* default fmtp to send (can be overridden by the init function) */
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8000, /* samples transferred per second */
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8000, /* actual samples transferred per second */
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13330, /* bits transferred per second */
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30000, /* number of microseconds per frame */
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ILBC_BLOCK_LEN_30MS, /* number of samples per frame */
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ILBC_BLOCK_LEN_30MS * 2, /* number of bytes per frame decompressed */
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ILBC_NO_OF_BYTES_30MS, /* number of bytes per frame compressed */
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1, /* number of channels represented */
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1, /* number of frames per network packet */
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switch_ilbc_init, /* function to initialize a codec handle using this implementation */
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switch_ilbc_encode, /* function to encode raw data into encoded data */
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switch_ilbc_decode, /* function to decode encoded data into raw data */
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switch_ilbc_destroy); /* deinitalize a codec handle using this implementation */
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/* indicate that the module should continue to be loaded */
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return SWITCH_STATUS_SUCCESS;
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}
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/* For Emacs:
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* Local Variables:
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* mode:c
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* indent-tabs-mode:t
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* tab-width:4
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* c-basic-offset:4
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* End:
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* For VIM:
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* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
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*/
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