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mod_g729.c
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mod_g729.c
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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2017, typefo <[email protected]>
*
* 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
* typefo <[email protected]>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* typefo <[email protected]>
* Matteo Brancaleoni <[email protected]>
*
* mod_g729.c -- G.729 Codec Module based on the bcg729 Library
*
*/
#include "switch.h"
#include "bcg729/encoder.h"
#include "bcg729/decoder.h"
SWITCH_MODULE_LOAD_FUNCTION(mod_g729_load);
SWITCH_MODULE_DEFINITION(mod_g729, mod_g729_load, NULL, NULL);
struct g729_context {
bcg729DecoderChannelContextStruct *decoder_object;
bcg729EncoderChannelContextStruct *encoder_object;
};
static switch_status_t switch_g729_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings) {
int encoding, decoding;
struct g729_context *context = NULL;
encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct g729_context))))) {
return SWITCH_STATUS_FALSE;
}
codec->fmtp_out = switch_core_strdup(codec->memory_pool, "annexb=no");
if (encoding) {
context->encoder_object = initBcg729EncoderChannel(0);
}
if (decoding) {
context->decoder_object = initBcg729DecoderChannel();
}
codec->private_info = context;
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_g729_destroy(switch_codec_t *codec) {
struct g729_context *context = codec->private_info;
closeBcg729EncoderChannel(context->encoder_object);
closeBcg729DecoderChannel(context->decoder_object);
codec->private_info = NULL;
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_g729_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 g729_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
if (decoded_data_len % 160 == 0) {
int x;
uint32_t new_len = 0;
int16_t *ddp = decoded_data;
uint8_t *edp = encoded_data;
int loops = (int)decoded_data_len / 160;
for (x = 0; x < loops && new_len < *encoded_data_len; x++) {
uint8_t length;
bcg729Encoder(context->encoder_object, ddp, edp, &length);
edp += length;
ddp += length * 8;
new_len += length;
}
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_t switch_g729_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 g729_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
int x;
int length;
uint32_t new_len = 0;
uint8_t *edp = encoded_data;
int16_t *ddp = decoded_data;
if (encoded_data_len == 0) {
bcg729Decoder(context->decoder_object, NULL, 0, 1, 0, 0, ddp);
ddp += 80;
decoded_data_len = (uint32_t *)160;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "g729 zero length frame\n");
return SWITCH_STATUS_SUCCESS;
}
for(x = 0; x < encoded_data_len && new_len < *decoded_data_len; x += length) {
uint8_t sid = ((encoded_data_len - x) < 8) ? 1 : 0;
length = (sid == 1) ? 2 : 10;
bcg729Decoder(context->decoder_object, edp, encoded_data_len, 0, sid, 0, ddp);
ddp += 80;
edp += length;
new_len += 160;
}
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;
}
return SWITCH_STATUS_SUCCESS;
}
SWITCH_MODULE_LOAD_FUNCTION(mod_g729_load) {
switch_codec_interface_t *codec_interface;
int mpf = 10000, spf = 80, bpf = 160, ebpf = 10, count;
/* 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, "G.729");
for (count = 12; count > 0; count--) {
switch_core_codec_add_implementation(pool, codec_interface, SWITCH_CODEC_TYPE_AUDIO, 18, "G729", "annexb=no", 8000, 8000, 8000,
mpf * count, spf * count, bpf * count, ebpf * count, 1, count * 10,
switch_g729_init, switch_g729_encode, switch_g729_decode, switch_g729_destroy);
}
/* indicate that the module should continue to be loaded */
return SWITCH_STATUS_SUCCESS;
}