doubango/branches/2.0/doubango/tinyDAV/src/codecs/gsm/tdav_codec_gsm.c

/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* 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_gsm.c
 * @brief GSM Full Rate Codec (Based on libgsm)
 *
 * @author Mamadou Diop <diopmamadou(at)doubango.org>
 *

 */
#include "tinydav/codecs/gsm/tdav_codec_gsm.h"

#if HAVE_LIBGSM

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

#define TDAV_GSM_FRAME_SIZE			33

/* ============ GSM Plugin interface ================= */

#define tdav_codec_gsm_sdp_att_get tsk_null

int tdav_codec_gsm_open(tmedia_codec_t* self)
{
	tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;
	
	if(!gsm->encoder && !(gsm->encoder = gsm_create())){
		TSK_DEBUG_ERROR("Failed to create GSM encoder");
		return -2;
	}
	if(!gsm->decoder && !(gsm->decoder = gsm_create())){
		TSK_DEBUG_ERROR("Failed to create GSM decoder");
		return -3;
	}

	return 0;
}

int tdav_codec_gsm_close(tmedia_codec_t* self)
{
	tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;

	if(gsm->encoder){
		gsm_destroy(gsm->encoder);
		gsm->encoder = tsk_null;
	}
	if(gsm->decoder){
		gsm_destroy(gsm->decoder);
		gsm->decoder = tsk_null;
	}

	return 0;
}

tsk_size_t tdav_codec_gsm_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_size;
	tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;

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

	out_size = ((in_size / (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_ENCODING(self) * sizeof(short))) * TDAV_GSM_FRAME_SIZE);

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

	gsm_encode(gsm->encoder, (gsm_signal*)in_data, (gsm_byte*)*out_data);

	return out_size;
}

tsk_size_t tdav_codec_gsm_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)
{
	tsk_size_t out_size;
	int ret;
	tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;

	if(!self || !in_data || !in_size || !out_data || (in_size % TDAV_GSM_FRAME_SIZE)){
		TSK_DEBUG_ERROR("Invalid parameter");
		return 0;
	}
	
	out_size = (in_size / TDAV_GSM_FRAME_SIZE) * (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_DECODING(self) * sizeof(short));

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

	ret = gsm_decode(gsm->decoder, (gsm_byte*)in_data, (gsm_signal*)*out_data);

	return out_size;
}

tsk_bool_t tdav_codec_gsm_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value)
{	/* always match */
	return tsk_true;
}


//
//	GSM Plugin definition
//

/* constructor */
static tsk_object_t* tdav_codec_gsm_ctor(tsk_object_t * self, va_list * app)
{
	tdav_codec_gsm_t *gsm = self;
	if(gsm){
		/* init base: called by tmedia_codec_create() */
		/* init self */
	}
	return self;
}
/* destructor */
static tsk_object_t* tdav_codec_gsm_dtor(tsk_object_t * self)
{ 
	tdav_codec_gsm_t *gsm = self;
	if(gsm){
		/* deinit base */
		tmedia_codec_audio_deinit(gsm);
		/* deinit self */
		if(gsm->encoder){
			gsm_destroy(gsm->encoder);
		}
		if(gsm->decoder){
			gsm_destroy(gsm->decoder);
		}
	}

	return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_gsm_def_s = 
{
	sizeof(tdav_codec_gsm_t),
	tdav_codec_gsm_ctor, 
	tdav_codec_gsm_dtor,
	tmedia_codec_cmp, 
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_gsm_plugin_def_s = 
{
	&tdav_codec_gsm_def_s,

	tmedia_audio,
	tmedia_codec_id_gsm,
	"GSM",
	"GSM Full Rate",
	TMEDIA_CODEC_FORMAT_GSM,
	tsk_false,
	8000, // rate
	
	{ /* audio */
		1, // channels
		0 // ptime @deprecated
	},

	/* video */
	{0},

	tsk_null, // set()
	tdav_codec_gsm_open,
	tdav_codec_gsm_close,
	tdav_codec_gsm_encode,
	tdav_codec_gsm_decode,
	tdav_codec_gsm_sdp_att_match,
	tdav_codec_gsm_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_gsm_plugin_def_t = &tdav_codec_gsm_plugin_def_s;


#endif /* HAVE_LIBGSM */