freeswitch/src/mod/codecs/mod_ilbc/mod_ilbc.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 / 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>
 * Michael Jerris <mike@jerris.com>
 *
 * mod_ilbc.c -- ilbc Codec Module
 *
 */
#include "switch.h"
#include "iLBC_encode.h"
#include "iLBC_decode.h"
#include "iLBC_define.h"

SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load);
SWITCH_MODULE_DEFINITION(mod_ilbc, mod_ilbc_load, NULL, NULL);

struct ilbc_context {
	iLBC_Enc_Inst_t encoder;
	iLBC_Dec_Inst_t decoder;
	uint8_t ms;
	uint16_t bytes;
	uint16_t dbytes;
};

static switch_status_t switch_ilbc_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
{
	struct ilbc_context *context;
	int encoding, decoding;
	uint8_t ms = (uint8_t) (codec->implementation->microseconds_per_frame / 1000);


	if (ms != 20 && ms != 30) {
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "invalid speed! (I should never happen)\n");
		return SWITCH_STATUS_FALSE;
	}

	encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
	decoding = (flags & SWITCH_CODEC_FLAG_DECODE);

	if (!(encoding || decoding)) {
		return SWITCH_STATUS_FALSE;
	} else {
		context = switch_core_alloc(codec->memory_pool, sizeof(*context));
		context->ms = ms;
		if (context->ms == 20) {
			context->bytes = NO_OF_BYTES_20MS;
			context->dbytes = 320;
		} else {
			context->bytes = NO_OF_BYTES_30MS;
			context->dbytes = 480;
		}

		if (encoding) {
			initEncode(&context->encoder, context->ms);
		}
		if (decoding) {
			initDecode(&context->decoder, context->ms, 1);
		}
	}

	codec->fmtp_out = switch_core_strdup(codec->memory_pool, codec->implementation->fmtp);

	codec->private_info = context;
	return SWITCH_STATUS_SUCCESS;
}


static switch_status_t switch_ilbc_destroy(switch_codec_t *codec)
{
	codec->private_info = NULL;
	return SWITCH_STATUS_SUCCESS;
}


static switch_status_t switch_ilbc_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 ilbc_context *context = codec->private_info;

	if (!context) {
		return SWITCH_STATUS_FALSE;
	}
	if (decoded_data_len % context->dbytes == 0) {
		unsigned int new_len = 0;
		unsigned char *edp = encoded_data;
		short *ddp = decoded_data;
		int x;
		uint16_t y;
		int loops = (int) decoded_data_len / context->dbytes;
		float buf[240];

		for (x = 0; x < loops && new_len < *encoded_data_len; x++) {
			for (y = 0; y < context->dbytes / sizeof(short); y++) {
				buf[y] = ddp[y];
			}
			iLBC_encode(edp, buf, &context->encoder);
			edp += context->bytes;
			ddp += context->dbytes;
			new_len += context->bytes;
		}
		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_ilbc_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 ilbc_context *context = codec->private_info;

	if (!context) {
		return SWITCH_STATUS_FALSE;
	}

	if (encoded_data_len % context->bytes == 0) {
		int loops = (int) encoded_data_len / context->bytes;
		unsigned char *edp = encoded_data;
		short *ddp = decoded_data;
		int x;
		uint16_t y;
		unsigned int new_len = 0;
		float buf[240];

		for (x = 0; x < loops && new_len < *decoded_data_len; x++) {
			iLBC_decode(buf, edp, &context->decoder, 1);
			for (y = 0; y < context->dbytes / sizeof(short); y++) {
				ddp[y] = (short) buf[y];
			}
			ddp += context->dbytes / sizeof(short);
			edp += context->bytes;
			new_len += context->dbytes;
		}
		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;
		}
	} else {
		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "yo this frame is an odd size [%d]\n", encoded_data_len);
		return SWITCH_STATUS_FALSE;
	}
	return SWITCH_STATUS_SUCCESS;
}


/* Registration */

static switch_codec_implementation_t ilbc_8k_30ms_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 97,
	/*.iananame */ "iLBC",
	/*.fmtp */ "mode=30",
	/*.samples_per_second */ 8000,
	/*.actual_samples_per_second */ 8000,
	/*.bits_per_second */ NO_OF_BYTES_30MS * 8 * 8000 / BLOCKL_30MS,
	/*.microseconds_per_frame */ 30000,
	/*.samples_per_frame */ 240,
	/*.bytes_per_frame */ 480,
	/*.encoded_bytes_per_frame */ NO_OF_BYTES_30MS,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_ilbc_init,
	/*.encode */ switch_ilbc_encode,
	/*.decode */ switch_ilbc_decode,
	/*.destroy */ switch_ilbc_destroy
};

static switch_codec_implementation_t ilbc_8k_20ms_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 97,
	/*.iananame */ "iLBC",
	/*.fmtp */ "mode=20",
	/*.samples_per_second */ 8000,
	/*.actual_samples_per_second */ 8000,
	/*.bits_per_second */ NO_OF_BYTES_20MS * 8 * 8000 / BLOCKL_20MS,
	/*.microseconds_per_frame */ 20000,
	/*.samples_per_frame */ 160,
	/*.bytes_per_frame */ 320,
	/*.encoded_bytes_per_frame */ NO_OF_BYTES_20MS,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_ilbc_init,
	/*.encode */ switch_ilbc_encode,
	/*.decode */ switch_ilbc_decode,
	/*.destroy */ switch_ilbc_destroy,
	/*.next */ &ilbc_8k_30ms_implementation
};



static switch_codec_implementation_t ilbc_102_8k_30ms_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 102,
	/*.iananame */ "iLBC",
	/*.fmtp */ "mode=30",
	/*.samples_per_second */ 8000,
	/*.actual_samples_per_second */ 8000,
	/*.bits_per_second */ NO_OF_BYTES_30MS * 8 * 8000 / BLOCKL_30MS,
	/*.microseconds_per_frame */ 30000,
	/*.samples_per_frame */ 240,
	/*.bytes_per_frame */ 480,
	/*.encoded_bytes_per_frame */ NO_OF_BYTES_30MS,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_ilbc_init,
	/*.encode */ switch_ilbc_encode,
	/*.decode */ switch_ilbc_decode,
	/*.destroy */ switch_ilbc_destroy
};

static switch_codec_implementation_t ilbc_102_8k_20ms_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 102,
	/*.iananame */ "iLBC102",
	/*.fmtp */ "mode=20",
	/*.samples_per_second */ 8000,
	/*.actual_samples_per_second */ 8000,
	/*.bits_per_second */ NO_OF_BYTES_20MS * 8 * 8000 / BLOCKL_20MS,
	/*.microseconds_per_frame */ 20000,
	/*.samples_per_frame */ 160,
	/*.bytes_per_frame */ 320,
	/*.encoded_bytes_per_frame */ NO_OF_BYTES_20MS,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_ilbc_init,
	/*.encode */ switch_ilbc_encode,
	/*.decode */ switch_ilbc_decode,
	/*.destroy */ switch_ilbc_destroy,
	/*.next */ &ilbc_102_8k_30ms_implementation
};


static switch_codec_implementation_t ilbc_8k_20ms_nonext_implementation = {
	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
	/*.ianacode */ 97,
	/*.iananame */ "iLBC20ms",
	/*.fmtp */ "mode=20",
	/*.samples_per_second */ 8000,
	/*.actual_samples_per_second */ 8000,
	/*.bits_per_second */ NO_OF_BYTES_20MS * 8 * 8000 / BLOCKL_20MS,
	/*.microseconds_per_frame */ 20000,
	/*.samples_per_frame */ 160,
	/*.bytes_per_frame */ 320,
	/*.encoded_bytes_per_frame */ NO_OF_BYTES_20MS,
	/*.number_of_channels */ 1,
	/*.pref_frames_per_packet */ 1,
	/*.max_frames_per_packet */ 1,
	/*.init */ switch_ilbc_init,
	/*.encode */ switch_ilbc_encode,
	/*.decode */ switch_ilbc_decode,
	/*.destroy */ switch_ilbc_destroy
};

SWITCH_MODULE_LOAD_FUNCTION(mod_ilbc_load)
{
	switch_codec_interface_t *codec_interface;
	/* 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, "ilbc", &ilbc_8k_20ms_implementation);
	SWITCH_ADD_CODEC(codec_interface, "ilbc", &ilbc_102_8k_20ms_implementation);
	SWITCH_ADD_CODEC(codec_interface, "ilbc", &ilbc_8k_20ms_nonext_implementation);

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

}

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