freeswitch/src/mod/codecs/mod_g722/mod_g722.c

/* 
 * 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 / G722 codec module
 *
 * The Initial Developer of the Original Code is
 * Brian K. West <brian.west@mac.com>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Brian K. West <brian.west@mac.com>
 * Anthony Minessale II <anthmct@yahoo.com>
 * Michael Jerris <mike@jerris.com>
 *
 * mod_g722.c -- G722 Codec Module
 *
 */
#include <switch.h>
#include "g7xx/g722.h"

static const char modname[] = "mod_g722";

struct g722_context {
	g722_decode_state_t decoder_object;
	g722_encode_state_t encoder_object;
};

static switch_status_t switch_g722_init(switch_codec_t *codec, switch_codec_flag_t flags,
									   const switch_codec_settings_t *codec_settings)
{
	int encoding, decoding;
	struct g722_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 g722_context))))) { 
		return SWITCH_STATUS_FALSE;
	} else {
		if (encoding) {
			if(codec->implementation->samples_per_second == 16000){
				g722_encode_init(&context->encoder_object, 64000, G722_PACKED);
			} else {
				g722_encode_init(&context->encoder_object, 64000, G722_SAMPLE_RATE_8000);
			}
		}
		if (decoding) {
			if(codec->implementation->samples_per_second == 16000){
				g722_decode_init(&context->decoder_object, 64000, G722_PACKED);
			} else {
				g722_decode_init(&context->decoder_object, 64000, G722_SAMPLE_RATE_8000);
			}
		}
	}

	codec->private_info = context;
	return SWITCH_STATUS_SUCCESS;	
}

static switch_status_t switch_g722_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 g722_context *context = codec->private_info;

	if (!context) {
		return SWITCH_STATUS_FALSE; 
	}

	*encoded_data_len = g722_encode(&context->encoder_object, (uint8_t *) encoded_data, (int16_t *) decoded_data, decoded_data_len / 2);
	
	return SWITCH_STATUS_SUCCESS;
}

static switch_status_t switch_g722_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 g722_context *context = codec->private_info;

	if (!context) {
		return SWITCH_STATUS_FALSE; 
	}

	*decoded_data_len = (2 * g722_decode(&context->decoder_object, (int16_t *) decoded_data, (uint8_t *) encoded_data, encoded_data_len));
	
	return SWITCH_STATUS_SUCCESS;
}

static switch_status_t switch_g722_destroy(switch_codec_t *codec)
{
	/* We do not need to use release here as the pool memory is taken care of for us */
	codec->private_info = NULL;
	return SWITCH_STATUS_SUCCESS;
}

/* Registration */

static const switch_codec_implementation_t g722_8k_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 9,
	/*.iananame */ "G722",
	/*.fmtp */ NULL,
	/*.samples_per_second */ 8000,
	/*.bits_per_second */ 64000,
	/*.microseconds_per_frame */ 20000,
	/*.samples_per_frame */ 160,
	/*.bytes_per_frame */ 320,
	/*.encoded_bytes_per_frame */ 160,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_g722_init,
	/*.encode */ switch_g722_encode,
	/*.decode */ switch_g722_decode,
	/*.destroy */ switch_g722_destroy,
};

static const switch_codec_implementation_t g722_16k_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 9,
	/*.iananame */ "G722",
	/*.fmtp */ NULL,
	/*.samples_per_second */ 16000,
	/*.bits_per_second */ 64000,
	/*.microseconds_per_frame */ 20000,
	/*.samples_per_frame */ 320,
	/*.bytes_per_frame */ 640,
	/*.encoded_bytes_per_frame */ 160,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_g722_init,
	/*.encode */ switch_g722_encode,
	/*.decode */ switch_g722_decode,
	/*.destroy */ switch_g722_destroy,
	/*.next */ &g722_8k_implementation
};

static const switch_codec_interface_t g722_codec_interface = {
	/*.interface_name */ "g722",
	/*.implementations */ &g722_16k_implementation
};

static switch_loadable_module_interface_t g722_module_interface = {
	/*.module_name */ modname,
	/*.endpoint_interface */ NULL,
	/*.timer_interface */ NULL,
	/*.dialplan_interface */ NULL,
	/*.codec_interface */ &g722_codec_interface,
	/*.application_interface */ NULL
};

SWITCH_MOD_DECLARE(switch_status_t) switch_module_load(const switch_loadable_module_interface_t **module_interface, char *filename)
{
	/* connect my internal structure to the blank pointer passed to me */
	*module_interface = &g722_module_interface;

	/* indicate that the module should continue to be loaded */
	return SWITCH_STATUS_SUCCESS;
}