210 lines
7.4 KiB
C
210 lines
7.4 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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* Copyright (C) 2005-2011, 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_opus.c -- The OPUS ultra-low delay audio codec (http://www.opus-codec.org/)
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*
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*/
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#include "switch.h"
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#include "opus.h"
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SWITCH_MODULE_LOAD_FUNCTION(mod_opus_load);
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SWITCH_MODULE_DEFINITION(mod_opus, mod_opus_load, NULL, NULL);
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struct opus_context {
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OpusEncoder *encoder_object;
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OpusDecoder *decoder_object;
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int frame_size;
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};
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static switch_status_t switch_opus_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 opus_context *context = NULL;
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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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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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context->frame_size = codec->implementation->samples_per_packet;
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if (encoding) {
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/* come up with a way to specify these */
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int bitrate_bps = codec->implementation->bits_per_second;
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int mode = MODE_HYBRID;
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int use_vbr = 1;
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int complexity = 10;
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int use_inbandfec = 1;
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int use_dtx = 1;
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int bandwidth = BANDWIDTH_FULLBAND;
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context->encoder_object = opus_encoder_create(codec->implementation->actual_samples_per_second, codec->implementation->number_of_channels);
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opus_encoder_ctl(context->encoder_object, OPUS_SET_MODE(mode));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_BITRATE(bitrate_bps));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_BANDWIDTH(bandwidth));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_VBR_FLAG(use_vbr));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_COMPLEXITY(complexity));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_INBAND_FEC_FLAG(use_inbandfec));
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opus_encoder_ctl(context->encoder_object, OPUS_SET_DTX_FLAG(use_dtx));
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}
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if (decoding) {
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context->decoder_object = opus_decoder_create(codec->implementation->actual_samples_per_second, codec->implementation->number_of_channels);
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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_opus_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_opus_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 opus_context *context = codec->private_info;
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int bytes = 0;
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int len = (int) *encoded_data_len;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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if (len > 1275) len = 1275;
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bytes = opus_encode(context->encoder_object, (void *) decoded_data, decoded_data_len / 2, (unsigned char *) encoded_data, len);
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if (bytes > 0) {
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*encoded_data_len = (uint32_t) bytes;
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return SWITCH_STATUS_SUCCESS;
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}
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switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Encoder Error!\n");
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return SWITCH_STATUS_GENERR;
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}
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static switch_status_t switch_opus_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 opus_context *context = codec->private_info;
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int samples = 0;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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samples = opus_decode(context->decoder_object, encoded_data, encoded_data_len, decoded_data, *decoded_data_len);
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if (samples < 0) {
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return SWITCH_STATUS_GENERR;
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}
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*decoded_data_len = samples * 2;
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return SWITCH_STATUS_SUCCESS;
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}
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SWITCH_MODULE_LOAD_FUNCTION(mod_opus_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, "OPUS (BETA)");
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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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115, /* the IANA code number */
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"OPUS", /* the IANA code name */
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NULL, /* default fmtp to send (can be overridden by the init function) */
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48000, /* samples transferred per second */
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48000, /* actual samples transferred per second */
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32000, /* bits transferred per second */
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10000, /* number of microseconds per frame */
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80, /* number of samples per frame */
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960, /* number of bytes per frame decompressed */
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0, /* 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_opus_init, /* function to initialize a codec handle using this implementation */
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switch_opus_encode, /* function to encode raw data into encoded data */
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switch_opus_decode, /* function to decode encoded data into raw data */
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switch_opus_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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115, /* the IANA code number */
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"OPUS", /* the IANA code name */
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NULL, /* default fmtp to send (can be overridden by the init function) */
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48000, /* samples transferred per second */
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48000, /* actual samples transferred per second */
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32000, /* bits transferred per second */
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20000, /* number of microseconds per frame */
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160, /* number of samples per frame */
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1920, /* number of bytes per frame decompressed */
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0, /* 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_opus_init, /* function to initialize a codec handle using this implementation */
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switch_opus_encode, /* function to encode raw data into encoded data */
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switch_opus_decode, /* function to decode encoded data into raw data */
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switch_opus_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:
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*/
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