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freeswitch/src/mod/codecs/mod_siren/mod_siren.c

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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2009, Anthony Minessale II <anthm@freeswitch.org>
*
* 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 <anthm@freeswitch.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Brian K. West <brian@freeswitch.org>
* Steve Underwood <steveu@coppice.org>
*
* mod_siren.c -- ITU-T G.722.1 (Siren7) and ITU-T G.722.1 Annex C (Siren14) licensed from Polycom(R)
*
* Using mod_siren in a commercial product will require you to acquire a patent
* license directly from Polycom(R) for your company.
*
* http://www.polycom.com/usa/en/company/about_us/technology/siren_g7221/siren_g7221.html
* http://www.polycom.com/usa/en/company/about_us/technology/siren14_g7221c/siren14_g7221c.html
*
*/
#include "switch.h"
#include "g722_1.h"
SWITCH_MODULE_LOAD_FUNCTION(mod_siren_load);
SWITCH_MODULE_DEFINITION(mod_siren, mod_siren_load, NULL, NULL);
struct siren_context {
g722_1_decode_state_t decoder_object;
g722_1_encode_state_t encoder_object;
};
static switch_status_t switch_siren_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
{
struct siren_context *context = NULL;
int encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
int decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
int bit_rate = codec->implementation->bits_per_second;
if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) {
return SWITCH_STATUS_FALSE;
}
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) {
g722_1_encode_init(&context->encoder_object, bit_rate, codec->implementation->samples_per_second);
}
if (decoding) {
g722_1_decode_init(&context->decoder_object, bit_rate, codec->implementation->samples_per_second);
}
codec->private_info = context;
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_siren_destroy(switch_codec_t *codec)
{
codec->private_info = NULL;
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_siren_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 siren_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
*encoded_data_len = g722_1_encode(&context->encoder_object, (uint8_t *) encoded_data, (int16_t *) decoded_data, decoded_data_len / sizeof(int16_t));
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_siren_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 siren_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
*decoded_data_len = g722_1_decode(&context->decoder_object, (int16_t *) decoded_data, (uint8_t *) encoded_data, encoded_data_len) * sizeof(int16_t);
return SWITCH_STATUS_SUCCESS;
}
SWITCH_MODULE_LOAD_FUNCTION(mod_siren_load)
{
switch_codec_interface_t *codec_interface;
int mpf = 20000, spf = 320, bpf = 640, count;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Audio coding: ITU-T Rec. G.722.1, licensed from Polycom(R)\n");
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Audio coding: ITU-T Rec. G.722.1 Annex C, licensed from Polycom(R)\n");
/* 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, "Polycom(R) G722.1/G722.1C");
spf = 320, bpf = 640;
for (count = 3; count > 0; count--) {
switch_core_codec_add_implementation(pool,
codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
107, /* the IANA code number */
"G7221", /* the IANA code name */
"bitrate=32000", /* default fmtp to send (can be overridden by the init function) */
16000, /* samples transferred per second */
16000, /* actual samples transferred per second */
32000, /* bits transferred per second */
mpf * count, /* number of microseconds per frame */
spf * count, /* number of samples per frame */
bpf * count, /* 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_siren_init, /* function to initialize a codec handle using this implementation */
switch_siren_encode, /* function to encode raw data into encoded data */
switch_siren_decode, /* function to decode encoded data into raw data */
switch_siren_destroy); /* deinitalize a codec handle using this implementation */
}
spf = 640, bpf = 1280;
for (count = 3; count > 0; count--) {
switch_core_codec_add_implementation(pool,
codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
115, /* the IANA code number */
"G7221", /* the IANA code name */
"bitrate=48000", /* default fmtp to send (can be overridden by the init function) */
32000, /* samples transferred per second */
32000, /* actual samples transferred per second */
48000, /* bits transferred per second */
mpf * count, /* number of microseconds per frame */
spf * count, /* number of samples per frame */
bpf * count, /* 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_siren_init, /* function to initialize a codec handle using this implementation */
switch_siren_encode, /* function to encode raw data into encoded data */
switch_siren_decode, /* function to decode encoded data into raw data */
switch_siren_destroy); /* deinitalize a codec handle using this implementation */
}
/* 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:
*/
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