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freeswitch/src/mod/codecs/mod_amr/mod_amr.c

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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
*
* 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 <anthmct@yahoo.com>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Anthony Minessale II <anthmct@yahoo.com>
* Brian K. West <brian.west@mac.com>
*
* The amr codec itself is not distributed with this module.
*
* mod_amr.c -- GSM-AMR Codec Module
*
*/
#include "switch.h"
SWITCH_MODULE_LOAD_FUNCTION(mod_amr_load);
SWITCH_MODULE_DEFINITION(mod_amr, mod_amr_load, NULL, NULL);
#ifndef AMR_PASSTHROUGH
#include "amr/interf_enc.h"
#include "amr/interf_dec.h"
/*
* Check section 8.1 of rfc3267 for possible sdp options.
*
* SDP Example
*
* a=fmtp:97 mode-set=0,2,5,7; mode-change-period=2; mode-change-neighbor=1
*
* Class A total speech
* Index Mode bits bits
* ----------------------------------------
* 0 AMR 4.75 42 95
* 1 AMR 5.15 49 103
* 2 AMR 5.9 55 118
* 3 AMR 6.7 58 134
* 4 AMR 7.4 61 148
* 5 AMR 7.95 75 159
* 6 AMR 10.2 65 204
* 7 AMR 12.2 81 244
* 8 AMR SID 39 39
*
* Table 1. The number of class A bits for the AMR codec.
*
*/
typedef enum {
AMR_OPT_OCTET_ALIGN = (1 << 0),
AMR_OPT_CRC = (1 << 1),
AMR_OPT_MODE_CHANGE_NEIGHBOR = (1 << 2),
AMR_OPT_ROBUST_SORTING = (1 << 3),
AMR_OPT_INTERLEAVING = (1 << 4)
} amr_flag_t;
typedef enum {
GENERIC_PARAMETER_AMR_MAXAL_SDUFRAMES = 0,
GENERIC_PARAMETER_AMR_BITRATE,
GENERIC_PARAMETER_AMR_GSMAMRCOMFORTNOISE,
GENERIC_PARAMETER_AMR_GSMEFRCOMFORTNOISE,
GENERIC_PARAMETER_AMR_IS_641COMFORTNOISE,
GENERIC_PARAMETER_AMR_PDCEFRCOMFORTNOISE
} amr_param_t;
typedef enum {
AMR_BITRATE_475 = 0,
AMR_BITRATE_515,
AMR_BITRATE_590,
AMR_BITRATE_670,
AMR_BITRATE_740,
AMR_BITRATE_795,
AMR_BITRATE_1020,
AMR_BITRATE_1220
} amr_bitrate_t;
struct amr_context {
void *encoder_state;
void *decoder_state;
switch_byte_t enc_modes;
switch_byte_t enc_mode;
uint32_t change_period;
switch_byte_t max_ptime;
switch_byte_t ptime;
switch_byte_t channels;
switch_byte_t flags;
};
#define AMR_DEFAULT_BITRATE AMR_BITRATE_1220
static struct {
switch_byte_t default_bitrate;
} globals;
#endif
static switch_status_t switch_amr_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
{
#ifdef AMR_PASSTHROUGH
codec->flags |= SWITCH_CODEC_FLAG_PASSTHROUGH;
if (codec->fmtp_in) {
codec->fmtp_out = switch_core_strdup(codec->memory_pool, codec->fmtp_in);
}
return SWITCH_STATUS_SUCCESS;
#else
struct amr_context *context = NULL;
int encoding, decoding;
int x, i, argc;
char *argv[10];
char fmtptmp[128];
encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct amr_context))))) {
return SWITCH_STATUS_FALSE;
} else {
if (codec->fmtp_in) {
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;
while (*data && *data == ' ') {
data++;
}
if ((arg = strchr(data, '='))) {
*arg++ = '\0';
//printf("Codec arg %d [%s]=[%s]\n", x, data, arg);
if (!strcasecmp(data, "octet-align")) {
if (atoi(arg)) {
switch_set_flag(context, AMR_OPT_OCTET_ALIGN);
}
} else if (!strcasecmp(data, "mode-change-neighbor")) {
if (atoi(arg)) {
switch_set_flag(context, AMR_OPT_MODE_CHANGE_NEIGHBOR);
}
} else if (!strcasecmp(data, "crc")) {
if (atoi(arg)) {
switch_set_flag(context, AMR_OPT_CRC);
}
} else if (!strcasecmp(data, "robust-sorting")) {
if (atoi(arg)) {
switch_set_flag(context, AMR_OPT_ROBUST_SORTING);
}
} else if (!strcasecmp(data, "interveaving")) {
if (atoi(arg)) {
switch_set_flag(context, AMR_OPT_INTERLEAVING);
}
} else if (!strcasecmp(data, "mode-change-period")) {
context->change_period = atoi(arg);
} else if (!strcasecmp(data, "ptime")) {
context->ptime = (switch_byte_t) atoi(arg);
} else if (!strcasecmp(data, "channels")) {
context->channels = (switch_byte_t) atoi(arg);
} else if (!strcasecmp(data, "maxptime")) {
context->max_ptime = (switch_byte_t) atoi(arg);
} else if (!strcasecmp(data, "mode-set")) {
int y, m_argc;
char *m_argv[7];
m_argc = switch_separate_string(arg, ',', m_argv, (sizeof(m_argv) / sizeof(m_argv[0])));
for (y = 0; y < m_argc; y++) {
context->enc_modes |= (1 << atoi(m_argv[y]));
}
}
}
}
}
if (context->enc_modes) {
for (i = 7; i > -1; i++) {
if (context->enc_modes & (1 << i)) {
context->enc_mode = (switch_byte_t) i;
break;
}
}
}
if (!context->enc_mode) {
context->enc_mode = globals.default_bitrate;
}
snprintf(fmtptmp, sizeof(fmtptmp), "octet-align=%d; mode-set=%d", switch_test_flag(context, AMR_OPT_OCTET_ALIGN) ? 1 : 0, context->enc_mode);
codec->fmtp_out = switch_core_strdup(codec->memory_pool, fmtptmp);
context->enc_mode = AMR_DEFAULT_BITRATE;
context->encoder_state = NULL;
context->decoder_state = NULL;
if (encoding) {
context->encoder_state = Encoder_Interface_init(1);
}
if (decoding) {
context->decoder_state = Decoder_Interface_init();
}
codec->private_info = context;
return SWITCH_STATUS_SUCCESS;
}
#endif
}
static switch_status_t switch_amr_destroy(switch_codec_t *codec)
{
#ifndef AMR_PASSTHROUGH
struct amr_context *context = codec->private_info;
if (context->encoder_state) {
Encoder_Interface_exit(context->encoder_state);
}
if (context->decoder_state) {
Decoder_Interface_exit(context->decoder_state);
}
codec->private_info = NULL;
#endif
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_amr_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)
{
#ifdef AMR_PASSTHROUGH
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "This codec is only usable in passthrough mode!\n");
return SWITCH_STATUS_FALSE;
#else
struct amr_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
*encoded_data_len = Encoder_Interface_Encode(context->encoder_state, context->enc_mode, (int16_t *) decoded_data, (switch_byte_t *) encoded_data, 0);
return SWITCH_STATUS_SUCCESS;
#endif
}
static switch_status_t switch_amr_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)
{
#ifdef AMR_PASSTHROUGH
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "This codec is only usable in passthrough mode!\n");
return SWITCH_STATUS_FALSE;
#else
struct amr_context *context = codec->private_info;
if (!context) {
return SWITCH_STATUS_FALSE;
}
Decoder_Interface_Decode(context->decoder_state, (unsigned char *) encoded_data, (int16_t *) decoded_data, 0);
*decoded_data_len = codec->implementation->bytes_per_frame;
return SWITCH_STATUS_SUCCESS;
#endif
}
/* Registration */
static switch_codec_implementation_t amr_implementation = {
/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
/*.ianacode */ 96,
/*.iananame */ "AMR",
/*.fmtp */ "octet-align=0",
/*.samples_per_second */ 8000,
/*.bits_per_second */ 0,
/*.microseconds_per_frame */ 20000,
/*.samples_per_frame */ 160,
/*.bytes_per_frame */ 320,
/*.encoded_bytes_per_frame */ 0,
/*.number_of_channels */ 1,
/*.pref_frames_per_packet */ 1,
/*.max_frames_per_packet */ 1,
/*.init */ switch_amr_init,
/*.encode */ switch_amr_encode,
/*.decode */ switch_amr_decode,
/*.destroy */ switch_amr_destroy,
};
SWITCH_MODULE_LOAD_FUNCTION(mod_amr_load)
{
switch_codec_interface_t *codec_interface;
#ifndef AMR_PASSTHROUGH
char *cf = "amr.conf";
switch_xml_t cfg, xml, settings, param;
memset(&globals, 0, sizeof(globals));
globals.default_bitrate = AMR_DEFAULT_BITRATE;
if ((xml = switch_xml_open_cfg(cf, &cfg, NULL))) {
if ((settings = switch_xml_child(cfg, "settings"))) {
for (param = switch_xml_child(settings, "param"); param; param = param->next) {
char *var = (char *) switch_xml_attr_soft(param, "name");
char *val = (char *) switch_xml_attr_soft(param, "value");
if (!strcasecmp(var, "default-bitrate")) {
globals.default_bitrate = (switch_byte_t) atoi(val);
}
}
}
}
#endif
/* 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, "GSM-AMR", &amr_implementation);
/* indicate that the module should continue to be loaded */
return SWITCH_STATUS_SUCCESS;
}
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