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mod_silk.c
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mod_silk.c
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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2012, 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):
*
* Anthony Minessale II <anthm@freeswitch.org>
* Brian K. West <brian@freeswitch.org>
*
* mod_silk.c -- Skype(tm) SILK Codec Module
*
*/
#include "switch.h"
#ifndef WIN32
#include "stfu.h"
#else
#include "../../../libs/stfu/stfu.h"
#endif
#include "SKP_Silk_SDK_API.h"
SWITCH_MODULE_LOAD_FUNCTION(mod_silk_load);
SWITCH_MODULE_DEFINITION(mod_silk, mod_silk_load, NULL, NULL);
#define MAX_BYTES_PER_FRAME 250
#define MAX_INPUT_FRAMES 5
#define MAX_LBRR_DELAY 2
#define MAX_FRAME_LENGTH 480
/*! \brief Various codec settings */
struct silk_codec_settings {
SKP_int useinbandfec;
SKP_int usedtx;
SKP_int maxaveragebitrate;
SKP_int plpct;
};
typedef struct silk_codec_settings silk_codec_settings_t;
static silk_codec_settings_t default_codec_settings = {
/*.useinbandfec */ 0,
/*.usedtx */ 0,
/*.maxaveragebitrate */ 0,
/*.plpct */ 10, // 10% for now
};
struct silk_context {
SKP_SILK_SDK_EncControlStruct encoder_object;
SKP_SILK_SDK_DecControlStruct decoder_object;
void *enc_state;
void *dec_state;
};
static switch_status_t switch_silk_fmtp_parse(const char *fmtp, switch_codec_fmtp_t *codec_fmtp)
{
if (codec_fmtp) {
silk_codec_settings_t *codec_settings = NULL;
if (codec_fmtp->private_info) {
codec_settings = codec_fmtp->private_info;
memcpy(codec_settings, &default_codec_settings, sizeof(*codec_settings));
}
if (fmtp) {
int x, argc;
char *argv[10];
char *fmtp_dup = strdup(fmtp);
switch_assert(fmtp_dup);
argc = switch_separate_string(fmtp_dup, ';', 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 (codec_settings) {
if (!strcasecmp(data, "useinbandfec")) {
if (switch_true(arg)) {
codec_settings->useinbandfec = 1;
}
}
if (!strcasecmp(data, "usedtx")) {
if (switch_true(arg)) {
codec_settings->usedtx = 1;
}
}
if (!strcasecmp(data, "maxaveragebitrate")) {
codec_settings->maxaveragebitrate = atoi(arg);
switch(codec_fmtp->actual_samples_per_second) {
case 8000:
{
if(codec_settings->maxaveragebitrate < 6000 || codec_settings->maxaveragebitrate > 20000) {
codec_settings->maxaveragebitrate = 20000;
}
break;
}
case 12000:
{
if(codec_settings->maxaveragebitrate < 7000 || codec_settings->maxaveragebitrate > 25000) {
codec_settings->maxaveragebitrate = 25000;
}
break;
}
case 16000:
{
if(codec_settings->maxaveragebitrate < 8000 || codec_settings->maxaveragebitrate > 30000) {
codec_settings->maxaveragebitrate = 30000;
}
break;
}
case 24000:
{
if(codec_settings->maxaveragebitrate < 12000 || codec_settings->maxaveragebitrate > 40000) {
codec_settings->maxaveragebitrate = 40000;
}
break;
}
default:
/* this should never happen but 20000 is common among all rates */
codec_settings->maxaveragebitrate = 20000;
break;
}
}
}
}
}
free(fmtp_dup);
}
//codec_fmtp->bits_per_second = bit_rate;
return SWITCH_STATUS_SUCCESS;
}
return SWITCH_STATUS_FALSE;
}
static switch_status_t switch_silk_init(switch_codec_t *codec,
switch_codec_flag_t freeswitch_flags,
const switch_codec_settings_t *codec_settings)
{
struct silk_context *context = NULL;
switch_codec_fmtp_t codec_fmtp;
silk_codec_settings_t silk_codec_settings;
SKP_int32 encSizeBytes;
SKP_int32 decSizeBytes;
int encoding = (freeswitch_flags & SWITCH_CODEC_FLAG_ENCODE);
int decoding = (freeswitch_flags & SWITCH_CODEC_FLAG_DECODE);
if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) {
return SWITCH_STATUS_FALSE;
}
memset(&codec_fmtp, '\0', sizeof(struct switch_codec_fmtp));
codec_fmtp.private_info = &silk_codec_settings;
switch_silk_fmtp_parse(codec->fmtp_in, &codec_fmtp);
codec->fmtp_out = switch_core_sprintf(codec->memory_pool, "useinbandfec=%s; usedtx=%s; maxaveragebitrate=%d",
silk_codec_settings.useinbandfec ? "1" : "0",
silk_codec_settings.usedtx ? "1" : "0",
silk_codec_settings.maxaveragebitrate ? silk_codec_settings.maxaveragebitrate : codec->implementation->bits_per_second);
if (encoding) {
if (SKP_Silk_SDK_Get_Encoder_Size(&encSizeBytes)) {
return SWITCH_STATUS_FALSE;
}
context->enc_state = switch_core_alloc(codec->memory_pool, encSizeBytes);
if (SKP_Silk_SDK_InitEncoder(context->enc_state, &context->encoder_object)) {
return SWITCH_STATUS_FALSE;
}
context->encoder_object.API_sampleRate = codec->implementation->actual_samples_per_second;
context->encoder_object.maxInternalSampleRate = codec->implementation->actual_samples_per_second;
context->encoder_object.packetSize = codec->implementation->samples_per_packet;
context->encoder_object.useInBandFEC = silk_codec_settings.useinbandfec;
context->encoder_object.complexity = 0;
context->encoder_object.bitRate = silk_codec_settings.maxaveragebitrate ? silk_codec_settings.maxaveragebitrate : codec->implementation->bits_per_second;
context->encoder_object.useDTX = silk_codec_settings.usedtx;
context->encoder_object.packetLossPercentage = silk_codec_settings.plpct;
}
if (decoding) {
if (SKP_Silk_SDK_Get_Decoder_Size(&decSizeBytes)) {
return SWITCH_STATUS_FALSE;
}
context->dec_state = switch_core_alloc(codec->memory_pool, decSizeBytes);
if (SKP_Silk_SDK_InitDecoder(context->dec_state)) {
return SWITCH_STATUS_FALSE;
}
context->decoder_object.API_sampleRate = codec->implementation->actual_samples_per_second;
}
codec->private_info = context;
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_silk_destroy(switch_codec_t *codec)
{
codec->private_info = NULL;
return SWITCH_STATUS_SUCCESS;
}
void printSilkError(SKP_int16 ret){
char * message;
switch (ret) {
case SKP_SILK_NO_ERROR: message = "No errors";
break;
case SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES:
message = "Input length is not multiplum of 10 ms, or length is longer than the packet length";
break;
case SKP_SILK_ENC_FS_NOT_SUPPORTED:
message = "Sampling frequency not 8000 , 12000, 16000 or 24000 Hertz";
break;
case SKP_SILK_ENC_PACKET_SIZE_NOT_SUPPORTED:
message ="Packet size not 20, 40 , 60 , 80 or 100 ms ";
break;
case SKP_SILK_ENC_PAYLOAD_BUF_TOO_SHORT:
message = "Allocated payload buffer too short";
break;
case SKP_SILK_ENC_INVALID_LOSS_RATE:
message = " Loss rate not between 0 and 100 % ";
break;
case SKP_SILK_ENC_INVALID_COMPLEXITY_SETTING:
message = "Complexity setting not valid, use 0 ,1 or 2";
break;
case SKP_SILK_ENC_INVALID_INBAND_FEC_SETTING:
message = "Inband FEC setting not valid, use 0 or 1 ";
break;
case SKP_SILK_ENC_INVALID_DTX_SETTING:
message = "DTX setting not valid, use 0 or 1";
break;
case SKP_SILK_ENC_INTERNAL_ERROR:
message = "Internal Encoder Error ";
break;
case SKP_SILK_DEC_INVALID_SAMPLING_FREQUENCY:
message = "Output sampling frequency lower than internal decoded sampling frequency";
break;
case SKP_SILK_DEC_PAYLOAD_TOO_LARGE:
message = "Payload size exceeded the maximum allowed 1024 bytes";
break;
case SKP_SILK_DEC_PAYLOAD_ERROR :
message = "Payload has bit errors";
break;
default:
message = "unknown";
break;
}
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR," Silk Error: %s\n",message);
}
static switch_status_t switch_silk_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 silk_context *context = codec->private_info;
SKP_int16 ret;
SKP_int16 pktsz = context->encoder_object.packetSize;
SKP_int16 nBytes = MAX_BYTES_PER_FRAME * MAX_INPUT_FRAMES;
SKP_int16 *lindata = (SKP_int16 *)decoded_data;
SKP_int16 samples = decoded_data_len /sizeof(SKP_int16);
*encoded_data_len = 0;
while (samples >= pktsz){
ret = SKP_Silk_SDK_Encode(context->enc_state,
&context->encoder_object,
lindata,
pktsz,
encoded_data,
&nBytes);
if (ret) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "SKP_Silk_Encode returned %d!\n", ret);
printSilkError(ret);
return SWITCH_STATUS_FALSE;
}
*encoded_data_len += nBytes;
samples-=pktsz;
lindata+= pktsz;
}
if (samples != 0){
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "switch_silk_encode dumping partial frame %d!\n", samples);
}
return SWITCH_STATUS_SUCCESS;
}
static switch_status_t switch_silk_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 silk_context *context = codec->private_info;
SKP_int16 ret, len;
int16_t *target = decoded_data;
switch_core_session_t *session = codec->session;
stfu_instance_t *jb = NULL;
SKP_int lost_flag = (*flag & SFF_PLC);
stfu_frame_t next_frame;
SKP_uint8 recbuff[STFU_DATALEN];
SKP_int16 reclen;
int32_t found_frame;
switch_bool_t did_lbrr = SWITCH_FALSE;
int i;
*decoded_data_len = 0;
if (lost_flag) {
if (session) {
jb = switch_core_session_get_jb(session, SWITCH_MEDIA_TYPE_AUDIO);
}
if (jb && codec && codec->cur_frame) {
for (i = 1; i <= MAX_LBRR_DELAY; i++) {
found_frame = stfu_n_copy_next_frame(jb, codec->cur_frame->timestamp, codec->cur_frame->seq, i, &next_frame);
if (found_frame) {
SKP_Silk_SDK_search_for_LBRR(next_frame.data, next_frame.dlen, i, (SKP_uint8*) &recbuff, &reclen);
if (reclen) {
encoded_data = &recbuff;
encoded_data_len = reclen;
lost_flag = SKP_FALSE;
did_lbrr = SWITCH_TRUE;
break;
}
}
}
}
}
do {
ret = SKP_Silk_SDK_Decode(context->dec_state,
&context->decoder_object,
lost_flag,
encoded_data,
encoded_data_len,
target,
&len);
if (ret){
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "SKP_Silk_Decode returned %d!\n", ret);
printSilkError(ret);
/* if FEC was activated, we can ignore bit errors*/
if (! (ret == SKP_SILK_DEC_PAYLOAD_ERROR && did_lbrr))
return SWITCH_STATUS_FALSE;
}
target += len;
*decoded_data_len += (len * 2);
} while (context->decoder_object.moreInternalDecoderFrames);
return SWITCH_STATUS_SUCCESS;
}
SWITCH_MODULE_LOAD_FUNCTION(mod_silk_load)
{
switch_codec_interface_t *codec_interface;
*module_interface = switch_loadable_module_create_module_interface(pool, modname);
SWITCH_ADD_CODEC(codec_interface, "SILK");
codec_interface->parse_fmtp = switch_silk_fmtp_parse;
switch_core_codec_add_implementation(pool, codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
117, /* the IANA code number */
"SILK", /* the IANA code name */
"useinbandfec=1; usedtx=0", /* default fmtp to send (can be overridden by the init function) */
8000, /* samples transferred per second */
8000, /* actual samples transferred per second */
20000, /* bits transferred per second */
20000, /* number of microseconds per frame */
160, /* number of samples per frame */
320, /* 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_silk_init, /* function to initialize a codec handle using this implementation */
switch_silk_encode, /* function to encode raw data into encoded data */
switch_silk_decode, /* function to decode encoded data into raw data */
switch_silk_destroy); /* deinitalize a codec handle using this implementation */
switch_core_codec_add_implementation(pool, codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
118, /* the IANA code number */
"SILK", /* the IANA code name */
"useinbandfec=1; usedtx=0", /* default fmtp to send (can be overridden by the init function) */
12000, /* samples transferred per second */
12000, /* actual samples transferred per second */
25000, /* bits transferred per second */
20000, /* number of microseconds per frame */
240, /* number of samples per frame */
480, /* 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_silk_init, /* function to initialize a codec handle using this implementation */
switch_silk_encode, /* function to encode raw data into encoded data */
switch_silk_decode, /* function to decode encoded data into raw data */
switch_silk_destroy); /* deinitalize a codec handle using this implementation */
switch_core_codec_add_implementation(pool, codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
119, /* the IANA code number */
"SILK", /* the IANA code name */
"useinbandfec=1; usedtx=0", /* default fmtp to send (can be overridden by the init function) */
16000, /* samples transferred per second */
16000, /* actual samples transferred per second */
30000, /* bits transferred per second */
20000, /* number of microseconds per frame */
320, /* number of samples per frame */
640, /* 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_silk_init, /* function to initialize a codec handle using this implementation */
switch_silk_encode, /* function to encode raw data into encoded data */
switch_silk_decode, /* function to decode encoded data into raw data */
switch_silk_destroy); /* deinitalize a codec handle using this implementation */
switch_core_codec_add_implementation(pool, codec_interface,
SWITCH_CODEC_TYPE_AUDIO, /* enumeration defining the type of the codec */
120, /* the IANA code number */
"SILK", /* the IANA code name */
"useinbandfec=1; usedtx=0", /* default fmtp to send (can be overridden by the init function) */
24000, /* samples transferred per second */
24000, /* actual samples transferred per second */
40000, /* bits transferred per second */
20000, /* number of microseconds per frame */
480, /* number of samples per frame */
960, /* 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_silk_init, /* function to initialize a codec handle using this implementation */
switch_silk_encode, /* function to encode raw data into encoded data */
switch_silk_decode, /* function to decode encoded data into raw data */
switch_silk_destroy); /* deinitalize a codec handle using this implementation */
/* indicate that the module should continue to be loaded */
return SWITCH_STATUS_SUCCESS;
}