doubango/branches/2.0/doubango/tinyDAV/src/codecs/g722/tdav_codec_g722.c

/*
* Copyright (C) 2011 Doubango Telecom <http://www.doubango.org>
*
* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
*	
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*	
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*	
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/

/**@file tdav_codec_g722.c
 * @brief G.722 codec plugins.
 *
 * @author Mamadou Diop <diopmamadou(at)doubango.org>
 *
 */
#include "tinydav/codecs/g722/tdav_codec_g722.h"

#include "tsk_memory.h"
#include "tsk_debug.h"

typedef struct tdav_codec_g722_s
{
	TMEDIA_DECLARE_CODEC_AUDIO;

	g722_encode_state_t *enc_state;
	g722_decode_state_t *dec_state;
}
tdav_codec_g722_t;

static int tdav_codec_g722_open(tmedia_codec_t* self)
{
	tdav_codec_g722_t* g722 = (tdav_codec_g722_t*)self;

	if(!g722){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	// Initialize the decoder
	if(!g722->dec_state){
		if(!(g722->dec_state = tsk_calloc(1, sizeof(g722_decode_state_t)))){
			TSK_DEBUG_ERROR("Failed to create G.722 decoder state");
			return -2;
		}
		// Create and/or reset the G.722 decoder
		// Bitrate 64 kbps and wideband mode (2)
		if(!(g722->dec_state = g722_decode_init(g722->dec_state, 64000, 2))){
			TSK_DEBUG_ERROR("g722_decode_init failed");
			return -3;
		}
	}
	
	// Initialize the encoder
	if(!g722->enc_state){
		if(!(g722->enc_state = tsk_calloc(1, sizeof(g722_encode_state_t)))){
			TSK_DEBUG_ERROR("Failed to create G.722 encoder state");
			return -4;
		}
		// Create and/or reset the G.722 encoder
		// Bitrate 64 kbps and wideband mode (2)
		if(!(g722->enc_state = g722_encode_init(g722->enc_state, 64000, 2))){
			TSK_DEBUG_ERROR("g722_encode_init failed");
			return -5;
		}
	}

	return 0;
}

static int tdav_codec_g722_close(tmedia_codec_t* self)
{
	tdav_codec_g722_t* g722 = (tdav_codec_g722_t*)self;	

	(void)(g722);
	
	/* resources will be freed by the dctor() */
	
	return 0;
}

static tsk_size_t tdav_codec_g722_encode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size)
{
	tsk_size_t out_g722_size;
	tdav_codec_g722_t* g722 = (tdav_codec_g722_t*)self;	
	
	if(!self || !in_data || !in_size || !out_data){
		TSK_DEBUG_ERROR("Invalid parameter");
		return 0;
	}
	
	out_g722_size = in_size>>2;

	if(*out_max_size <out_g722_size){
		if(!(*out_data = tsk_realloc(*out_data, out_g722_size))){
			TSK_DEBUG_ERROR("Failed to allocate new buffer");
			*out_max_size = 0;
			return 0;
		}
		*out_max_size = out_g722_size;
	}
	
	g722_encode(g722->enc_state, (uint8_t*)*out_data, (int16_t*)in_data, in_size/sizeof(int16_t));
	
	return out_g722_size;
}

static tsk_size_t tdav_codec_g722_decode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size, const tsk_object_t* proto_hdr)
{
	tdav_codec_g722_t* g722 = (tdav_codec_g722_t*)self;	

	if(!self || !in_data || !in_size || !out_data){
		TSK_DEBUG_ERROR("Invalid parameter");
		return 0;
	}

	/* allocate new buffer */
	if(*out_max_size<(in_size<<2)){
		if(!(*out_data = tsk_realloc(*out_data, in_size<<2))){
			TSK_DEBUG_ERROR("Failed to allocate new buffer");
			*out_max_size = 0;
			return 0;
		}
		*out_max_size = in_size<<2;
	}

	g722_decode(g722->dec_state, (int16_t*)*out_data, (uint8_t*)in_data, in_size);

	return (in_size<<2);
}

static tsk_bool_t tdav_codec_g722_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value)
{
	return tsk_true;
}

static char* tdav_codec_g722_sdp_att_get(const tmedia_codec_t* codec, const char* att_name)
{
	return tsk_null;
}

//
//	g722 Plugin definition
//

/* constructor */
static tsk_object_t* tdav_codec_g722_ctor(tsk_object_t * self, va_list * app)
{
	tdav_codec_g722_t *g722 = self;
	if(g722){
		/* init base: called by tmedia_codec_create() */
		/* init self */
		
	}
	return self;
}
/* destructor */
static tsk_object_t* tdav_codec_g722_dtor(tsk_object_t * self)
{ 
	tdav_codec_g722_t *g722 = self;
	if(g722){
		/* deinit base */
		tmedia_codec_audio_deinit(g722);
		/* deinit self */
		if(g722->enc_state){
			g722_encode_release(g722->enc_state), g722->enc_state = tsk_null;
		}
		if(g722->dec_state){
			g722_decode_release(g722->dec_state), g722->dec_state = tsk_null;
		}
	}

	return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_g722_def_s = 
{
	sizeof(tdav_codec_g722_t),
	tdav_codec_g722_ctor, 
	tdav_codec_g722_dtor,
	tmedia_codec_cmp, 
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_g722_plugin_def_s = 
{
	&tdav_codec_g722_def_s,

	tmedia_audio,
	tmedia_codec_id_g722,
	"G722",
	"g722 Codec",
	TMEDIA_CODEC_FORMAT_G722,
	tsk_false,
	16000,
	
	{ /* audio */
		1, // channels
		0 // ptime @deprecated
	},

	/* video */
	{0},

	tsk_null, // set()
	tdav_codec_g722_open,
	tdav_codec_g722_close,
	tdav_codec_g722_encode,
	tdav_codec_g722_decode,
	tdav_codec_g722_sdp_att_match,
	tdav_codec_g722_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_g722_plugin_def_t = &tdav_codec_g722_plugin_def_s;