speexcodec.h

MiniSip Client with DomainKeys Authentication, Sip, Audio communications, Echo Cancel

/*
 Copyright (C) 2004-2006 the Minisip Team
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.
 
 This library 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
 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

/* Copyright (C) 2004 
 *
 * Authors: Erik Eliasson <[e-mail]>
 *          Johan Bilien <[e-mail]>
*/

#ifndef SpeexCodec_H
#define SpeexCodec_H

#include<libminisip/libminisip_config.h>

#include<libminisip/codecs/Codec.h>

#include<speex/speex.h> 

#define     MAX_NB_BYTES  1024

class SpeexCodecState : public CodecState{
	public:
		SpeexCodecState();
		virtual ~SpeexCodecState();

		/**
		 * @returns Number of bytes in output buffer
		 */
		virtual uint32_t encode(void *in_buf, int32_t in_buf_size, void *out_buf);

		/**
		 * 
		 * @returns Number of samples in output buffer
		 */
		virtual uint32_t decode(void *in_buf, int32_t in_buf_size, void *out_buf);
	
	private:
		void         *enc_state; 
		void         *dec_state; 
		SpeexBits    bits;   	 
		float 	     input_frame[160]; 
		int	     nbBytes;		
		char         bytes_ptr[MAX_NB_BYTES];  
		char        *input_bytes;    
		float       *output_frame;  
		int          frame_size;
};


class SpeexCodec : public AudioCodec{
	public:
		SpeexCodec( MRef<Library *> lib );
		virtual MRef<CodecState *> newInstance();

		/**
		 * @return Requested sampling freq for the CODEC
		 */
		virtual int32_t getSamplingFreq();

		/**
		 * Time in milliseconds to put in each frame/packet. This is 20ms for the SPEEX codec.
		 */
		virtual int32_t getSamplingSizeMs();

		/**
		 * size of the output of the codec in bytes. This is 160.
		 */
//		virtual int32_t getEncodedNrBytes();
		
		virtual int32_t getInputNrSamples();
		
		virtual std::string getCodecName();
		
		virtual std::string getCodecDescription();

		virtual uint8_t getSdpMediaType();

		virtual std::string getSdpMediaAttributes();

		virtual uint32_t getVersion()const;
};

#endif